+/*
+ * The backend-independent part of the reference module.
+ */
+
#include "cache.h"
+#include "config.h"
+#include "hashmap.h"
+#include "lockfile.h"
+#include "iterator.h"
#include "refs.h"
+#include "refs/refs-internal.h"
#include "object.h"
#include "tag.h"
-#include "dir.h"
-#include "string-list.h"
+#include "submodule.h"
+#include "worktree.h"
/*
- * Make sure "ref" is something reasonable to have under ".git/refs/";
- * We do not like it if:
- *
- * - any path component of it begins with ".", or
- * - it has double dots "..", or
- * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
- * - it ends with a "/".
- * - it ends with ".lock"
- * - it contains a "\" (backslash)
+ * List of all available backends
*/
+static struct ref_storage_be *refs_backends = &refs_be_files;
-/* Return true iff ch is not allowed in reference names. */
-static inline int bad_ref_char(int ch)
+static struct ref_storage_be *find_ref_storage_backend(const char *name)
{
- if (((unsigned) ch) <= ' ' || ch == 0x7f ||
- ch == '~' || ch == '^' || ch == ':' || ch == '\\')
- return 1;
- /* 2.13 Pattern Matching Notation */
- if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
- return 1;
- return 0;
+ struct ref_storage_be *be;
+ for (be = refs_backends; be; be = be->next)
+ if (!strcmp(be->name, name))
+ return be;
+ return NULL;
+}
+
+int ref_storage_backend_exists(const char *name)
+{
+ return find_ref_storage_backend(name) != NULL;
}
/*
- * Try to read one refname component from the front of refname. Return
- * the length of the component found, or -1 if the component is not
- * legal.
+ * How to handle various characters in refnames:
+ * 0: An acceptable character for refs
+ * 1: End-of-component
+ * 2: ., look for a preceding . to reject .. in refs
+ * 3: {, look for a preceding @ to reject @{ in refs
+ * 4: A bad character: ASCII control characters, and
+ * ":", "?", "[", "\", "^", "~", SP, or TAB
+ * 5: *, reject unless REFNAME_REFSPEC_PATTERN is set
+ */
+static unsigned char refname_disposition[256] = {
+ 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
+};
+
+/*
+ * Try to read one refname component from the front of refname.
+ * Return the length of the component found, or -1 if the component is
+ * not legal. It is legal if it is something reasonable to have under
+ * ".git/refs/"; We do not like it if:
+ *
+ * - any path component of it begins with ".", or
+ * - it has double dots "..", or
+ * - it has ASCII control characters, or
+ * - it has ":", "?", "[", "\", "^", "~", SP, or TAB anywhere, or
+ * - it has "*" anywhere unless REFNAME_REFSPEC_PATTERN is set, or
+ * - it ends with a "/", or
+ * - it ends with ".lock", or
+ * - it contains a "@{" portion
*/
-static int check_refname_component(const char *refname, int flags)
+static int check_refname_component(const char *refname, int *flags)
{
const char *cp;
char last = '\0';
for (cp = refname; ; cp++) {
- char ch = *cp;
- if (ch == '\0' || ch == '/')
+ int ch = *cp & 255;
+ unsigned char disp = refname_disposition[ch];
+ switch (disp) {
+ case 1:
+ goto out;
+ case 2:
+ if (last == '.')
+ return -1; /* Refname contains "..". */
+ break;
+ case 3:
+ if (last == '@')
+ return -1; /* Refname contains "@{". */
+ break;
+ case 4:
+ return -1;
+ case 5:
+ if (!(*flags & REFNAME_REFSPEC_PATTERN))
+ return -1; /* refspec can't be a pattern */
+
+ /*
+ * Unset the pattern flag so that we only accept
+ * a single asterisk for one side of refspec.
+ */
+ *flags &= ~ REFNAME_REFSPEC_PATTERN;
break;
- if (bad_ref_char(ch))
- return -1; /* Illegal character in refname. */
- if (last == '.' && ch == '.')
- return -1; /* Refname contains "..". */
- if (last == '@' && ch == '{')
- return -1; /* Refname contains "@{". */
+ }
last = ch;
}
+out:
if (cp == refname)
return 0; /* Component has zero length. */
- if (refname[0] == '.') {
- if (!(flags & REFNAME_DOT_COMPONENT))
- return -1; /* Component starts with '.'. */
- /*
- * Even if leading dots are allowed, don't allow "."
- * as a component (".." is prevented by a rule above).
- */
- if (refname[1] == '\0')
- return -1; /* Component equals ".". */
- }
- if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
+ if (refname[0] == '.')
+ return -1; /* Component starts with '.'. */
+ if (cp - refname >= LOCK_SUFFIX_LEN &&
+ !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN))
return -1; /* Refname ends with ".lock". */
return cp - refname;
}
while (1) {
/* We are at the start of a path component. */
- component_len = check_refname_component(refname, flags);
- if (component_len <= 0) {
- if ((flags & REFNAME_REFSPEC_PATTERN) &&
- refname[0] == '*' &&
- (refname[1] == '\0' || refname[1] == '/')) {
- /* Accept one wildcard as a full refname component. */
- flags &= ~REFNAME_REFSPEC_PATTERN;
- component_len = 1;
- } else {
- return -1;
- }
- }
+ component_len = check_refname_component(refname, &flags);
+ if (component_len <= 0)
+ return -1;
+
component_count++;
if (refname[component_len] == '\0')
break;
return 0;
}
-struct ref_entry;
-
-/*
- * Information used (along with the information in ref_entry) to
- * describe a single cached reference. This data structure only
- * occurs embedded in a union in struct ref_entry, and only when
- * (ref_entry->flag & REF_DIR) is zero.
- */
-struct ref_value {
- /*
- * The name of the object to which this reference resolves
- * (which may be a tag object). If REF_ISBROKEN, this is
- * null. If REF_ISSYMREF, then this is the name of the object
- * referred to by the last reference in the symlink chain.
- */
- unsigned char sha1[20];
-
- /*
- * If REF_KNOWS_PEELED, then this field holds the peeled value
- * of this reference, or null if the reference is known not to
- * be peelable. See the documentation for peel_ref() for an
- * exact definition of "peelable".
- */
- unsigned char peeled[20];
-};
-
-struct ref_cache;
-
-/*
- * Information used (along with the information in ref_entry) to
- * describe a level in the hierarchy of references. This data
- * structure only occurs embedded in a union in struct ref_entry, and
- * only when (ref_entry.flag & REF_DIR) is set. In that case,
- * (ref_entry.flag & REF_INCOMPLETE) determines whether the references
- * in the directory have already been read:
- *
- * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose
- * or packed references, already read.
- *
- * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose
- * references that hasn't been read yet (nor has any of its
- * subdirectories).
- *
- * Entries within a directory are stored within a growable array of
- * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i <
- * sorted are sorted by their component name in strcmp() order and the
- * remaining entries are unsorted.
- *
- * Loose references are read lazily, one directory at a time. When a
- * directory of loose references is read, then all of the references
- * in that directory are stored, and REF_INCOMPLETE stubs are created
- * for any subdirectories, but the subdirectories themselves are not
- * read. The reading is triggered by get_ref_dir().
- */
-struct ref_dir {
- int nr, alloc;
-
- /*
- * Entries with index 0 <= i < sorted are sorted by name. New
- * entries are appended to the list unsorted, and are sorted
- * only when required; thus we avoid the need to sort the list
- * after the addition of every reference.
- */
- int sorted;
-
- /* A pointer to the ref_cache that contains this ref_dir. */
- struct ref_cache *ref_cache;
-
- struct ref_entry **entries;
-};
+int refname_is_safe(const char *refname)
+{
+ const char *rest;
-/*
- * Bit values for ref_entry::flag. REF_ISSYMREF=0x01,
- * REF_ISPACKED=0x02, and REF_ISBROKEN=0x04 are public values; see
- * refs.h.
- */
+ if (skip_prefix(refname, "refs/", &rest)) {
+ char *buf;
+ int result;
+ size_t restlen = strlen(rest);
-/*
- * The field ref_entry->u.value.peeled of this value entry contains
- * the correct peeled value for the reference, which might be
- * null_sha1 if the reference is not a tag or if it is broken.
- */
-#define REF_KNOWS_PEELED 0x08
+ /* rest must not be empty, or start or end with "/" */
+ if (!restlen || *rest == '/' || rest[restlen - 1] == '/')
+ return 0;
-/* ref_entry represents a directory of references */
-#define REF_DIR 0x10
+ /*
+ * Does the refname try to escape refs/?
+ * For example: refs/foo/../bar is safe but refs/foo/../../bar
+ * is not.
+ */
+ buf = xmallocz(restlen);
+ result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest);
+ free(buf);
+ return result;
+ }
-/*
- * Entry has not yet been read from disk (used only for REF_DIR
- * entries representing loose references)
- */
-#define REF_INCOMPLETE 0x20
+ do {
+ if (!isupper(*refname) && *refname != '_')
+ return 0;
+ refname++;
+ } while (*refname);
+ return 1;
+}
/*
- * A ref_entry represents either a reference or a "subdirectory" of
- * references.
- *
- * Each directory in the reference namespace is represented by a
- * ref_entry with (flags & REF_DIR) set and containing a subdir member
- * that holds the entries in that directory that have been read so
- * far. If (flags & REF_INCOMPLETE) is set, then the directory and
- * its subdirectories haven't been read yet. REF_INCOMPLETE is only
- * used for loose reference directories.
- *
- * References are represented by a ref_entry with (flags & REF_DIR)
- * unset and a value member that describes the reference's value. The
- * flag member is at the ref_entry level, but it is also needed to
- * interpret the contents of the value field (in other words, a
- * ref_value object is not very much use without the enclosing
- * ref_entry).
- *
- * Reference names cannot end with slash and directories' names are
- * always stored with a trailing slash (except for the top-level
- * directory, which is always denoted by ""). This has two nice
- * consequences: (1) when the entries in each subdir are sorted
- * lexicographically by name (as they usually are), the references in
- * a whole tree can be generated in lexicographic order by traversing
- * the tree in left-to-right, depth-first order; (2) the names of
- * references and subdirectories cannot conflict, and therefore the
- * presence of an empty subdirectory does not block the creation of a
- * similarly-named reference. (The fact that reference names with the
- * same leading components can conflict *with each other* is a
- * separate issue that is regulated by is_refname_available().)
- *
- * Please note that the name field contains the fully-qualified
- * reference (or subdirectory) name. Space could be saved by only
- * storing the relative names. But that would require the full names
- * to be generated on the fly when iterating in do_for_each_ref(), and
- * would break callback functions, who have always been able to assume
- * that the name strings that they are passed will not be freed during
- * the iteration.
+ * Return true if refname, which has the specified oid and flags, can
+ * be resolved to an object in the database. If the referred-to object
+ * does not exist, emit a warning and return false.
*/
-struct ref_entry {
- unsigned char flag; /* ISSYMREF? ISPACKED? */
- union {
- struct ref_value value; /* if not (flags&REF_DIR) */
- struct ref_dir subdir; /* if (flags&REF_DIR) */
- } u;
- /*
- * The full name of the reference (e.g., "refs/heads/master")
- * or the full name of the directory with a trailing slash
- * (e.g., "refs/heads/"):
- */
- char name[FLEX_ARRAY];
-};
-
-static void read_loose_refs(const char *dirname, struct ref_dir *dir);
-
-static struct ref_dir *get_ref_dir(struct ref_entry *entry)
+int ref_resolves_to_object(const char *refname,
+ const struct object_id *oid,
+ unsigned int flags)
{
- struct ref_dir *dir;
- assert(entry->flag & REF_DIR);
- dir = &entry->u.subdir;
- if (entry->flag & REF_INCOMPLETE) {
- read_loose_refs(entry->name, dir);
- entry->flag &= ~REF_INCOMPLETE;
+ if (flags & REF_ISBROKEN)
+ return 0;
+ if (!has_sha1_file(oid->hash)) {
+ error("%s does not point to a valid object!", refname);
+ return 0;
}
- return dir;
+ return 1;
}
-static struct ref_entry *create_ref_entry(const char *refname,
- const unsigned char *sha1, int flag,
- int check_name)
+char *refs_resolve_refdup(struct ref_store *refs,
+ const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- int len;
- struct ref_entry *ref;
+ const char *result;
- if (check_name &&
- check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
- die("Reference has invalid format: '%s'", refname);
- len = strlen(refname) + 1;
- ref = xmalloc(sizeof(struct ref_entry) + len);
- hashcpy(ref->u.value.sha1, sha1);
- hashclr(ref->u.value.peeled);
- memcpy(ref->name, refname, len);
- ref->flag = flag;
- return ref;
+ result = refs_resolve_ref_unsafe(refs, refname, resolve_flags,
+ sha1, flags);
+ return xstrdup_or_null(result);
}
-static void clear_ref_dir(struct ref_dir *dir);
-
-static void free_ref_entry(struct ref_entry *entry)
+char *resolve_refdup(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- if (entry->flag & REF_DIR) {
- /*
- * Do not use get_ref_dir() here, as that might
- * trigger the reading of loose refs.
- */
- clear_ref_dir(&entry->u.subdir);
- }
- free(entry);
+ return refs_resolve_refdup(get_main_ref_store(),
+ refname, resolve_flags,
+ sha1, flags);
}
-/*
- * Add a ref_entry to the end of dir (unsorted). Entry is always
- * stored directly in dir; no recursion into subdirectories is
- * done.
- */
-static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry)
+/* The argument to filter_refs */
+struct ref_filter {
+ const char *pattern;
+ each_ref_fn *fn;
+ void *cb_data;
+};
+
+int refs_read_ref_full(struct ref_store *refs, const char *refname,
+ int resolve_flags, unsigned char *sha1, int *flags)
{
- ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc);
- dir->entries[dir->nr++] = entry;
- /* optimize for the case that entries are added in order */
- if (dir->nr == 1 ||
- (dir->nr == dir->sorted + 1 &&
- strcmp(dir->entries[dir->nr - 2]->name,
- dir->entries[dir->nr - 1]->name) < 0))
- dir->sorted = dir->nr;
+ if (refs_resolve_ref_unsafe(refs, refname, resolve_flags, sha1, flags))
+ return 0;
+ return -1;
}
-/*
- * Clear and free all entries in dir, recursively.
- */
-static void clear_ref_dir(struct ref_dir *dir)
+int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
{
- int i;
- for (i = 0; i < dir->nr; i++)
- free_ref_entry(dir->entries[i]);
- free(dir->entries);
- dir->sorted = dir->nr = dir->alloc = 0;
- dir->entries = NULL;
+ return refs_read_ref_full(get_main_ref_store(), refname,
+ resolve_flags, sha1, flags);
}
-/*
- * Create a struct ref_entry object for the specified dirname.
- * dirname is the name of the directory with a trailing slash (e.g.,
- * "refs/heads/") or "" for the top-level directory.
- */
-static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
- const char *dirname, size_t len,
- int incomplete)
+int read_ref(const char *refname, unsigned char *sha1)
{
- struct ref_entry *direntry;
- direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1);
- memcpy(direntry->name, dirname, len);
- direntry->name[len] = '\0';
- direntry->u.subdir.ref_cache = ref_cache;
- direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
- return direntry;
+ return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
}
-static int ref_entry_cmp(const void *a, const void *b)
+int ref_exists(const char *refname)
{
- struct ref_entry *one = *(struct ref_entry **)a;
- struct ref_entry *two = *(struct ref_entry **)b;
- return strcmp(one->name, two->name);
+ return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, NULL, NULL);
}
-static void sort_ref_dir(struct ref_dir *dir);
-
-struct string_slice {
- size_t len;
- const char *str;
-};
-
-static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
+static int filter_refs(const char *refname, const struct object_id *oid,
+ int flags, void *data)
{
- const struct string_slice *key = key_;
- const struct ref_entry *ent = *(const struct ref_entry * const *)ent_;
- int cmp = strncmp(key->str, ent->name, key->len);
- if (cmp)
- return cmp;
- return '\0' - (unsigned char)ent->name[key->len];
+ struct ref_filter *filter = (struct ref_filter *)data;
+
+ if (wildmatch(filter->pattern, refname, 0))
+ return 0;
+ return filter->fn(refname, oid, flags, filter->cb_data);
}
-/*
- * Return the index of the entry with the given refname from the
- * ref_dir (non-recursively), sorting dir if necessary. Return -1 if
- * no such entry is found. dir must already be complete.
- */
-static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len)
+enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
{
- struct ref_entry **r;
- struct string_slice key;
+ struct object *o = lookup_unknown_object(name);
- if (refname == NULL || !dir->nr)
- return -1;
+ if (o->type == OBJ_NONE) {
+ int type = sha1_object_info(name, NULL);
+ if (type < 0 || !object_as_type(o, type, 0))
+ return PEEL_INVALID;
+ }
- sort_ref_dir(dir);
- key.len = len;
- key.str = refname;
- r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries),
- ref_entry_cmp_sslice);
+ if (o->type != OBJ_TAG)
+ return PEEL_NON_TAG;
- if (r == NULL)
- return -1;
+ o = deref_tag_noverify(o);
+ if (!o)
+ return PEEL_INVALID;
- return r - dir->entries;
+ hashcpy(sha1, o->oid.hash);
+ return PEEL_PEELED;
}
-/*
- * Search for a directory entry directly within dir (without
- * recursing). Sort dir if necessary. subdirname must be a directory
- * name (i.e., end in '/'). If mkdir is set, then create the
- * directory if it is missing; otherwise, return NULL if the desired
- * directory cannot be found. dir must already be complete.
- */
-static struct ref_dir *search_for_subdir(struct ref_dir *dir,
- const char *subdirname, size_t len,
- int mkdir)
-{
- int entry_index = search_ref_dir(dir, subdirname, len);
- struct ref_entry *entry;
- if (entry_index == -1) {
- if (!mkdir)
- return NULL;
- /*
- * Since dir is complete, the absence of a subdir
- * means that the subdir really doesn't exist;
- * therefore, create an empty record for it but mark
- * the record complete.
- */
- entry = create_dir_entry(dir->ref_cache, subdirname, len, 0);
- add_entry_to_dir(dir, entry);
- } else {
- entry = dir->entries[entry_index];
- }
- return get_ref_dir(entry);
-}
+struct warn_if_dangling_data {
+ FILE *fp;
+ const char *refname;
+ const struct string_list *refnames;
+ const char *msg_fmt;
+};
-/*
- * If refname is a reference name, find the ref_dir within the dir
- * tree that should hold refname. If refname is a directory name
- * (i.e., ends in '/'), then return that ref_dir itself. dir must
- * represent the top-level directory and must already be complete.
- * Sort ref_dirs and recurse into subdirectories as necessary. If
- * mkdir is set, then create any missing directories; otherwise,
- * return NULL if the desired directory cannot be found.
- */
-static struct ref_dir *find_containing_dir(struct ref_dir *dir,
- const char *refname, int mkdir)
+static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
+ int flags, void *cb_data)
{
- const char *slash;
- for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
- size_t dirnamelen = slash - refname + 1;
- struct ref_dir *subdir;
- subdir = search_for_subdir(dir, refname, dirnamelen, mkdir);
- if (!subdir) {
- dir = NULL;
- break;
- }
- dir = subdir;
+ struct warn_if_dangling_data *d = cb_data;
+ const char *resolves_to;
+
+ if (!(flags & REF_ISSYMREF))
+ return 0;
+
+ resolves_to = resolve_ref_unsafe(refname, 0, NULL, NULL);
+ if (!resolves_to
+ || (d->refname
+ ? strcmp(resolves_to, d->refname)
+ : !string_list_has_string(d->refnames, resolves_to))) {
+ return 0;
}
- return dir;
+ fprintf(d->fp, d->msg_fmt, refname);
+ fputc('\n', d->fp);
+ return 0;
}
-/*
- * Find the value entry with the given name in dir, sorting ref_dirs
- * and recursing into subdirectories as necessary. If the name is not
- * found or it corresponds to a directory entry, return NULL.
- */
-static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname)
+void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
{
- int entry_index;
- struct ref_entry *entry;
- dir = find_containing_dir(dir, refname, 0);
- if (!dir)
- return NULL;
- entry_index = search_ref_dir(dir, refname, strlen(refname));
- if (entry_index == -1)
- return NULL;
- entry = dir->entries[entry_index];
- return (entry->flag & REF_DIR) ? NULL : entry;
+ struct warn_if_dangling_data data;
+
+ data.fp = fp;
+ data.refname = refname;
+ data.refnames = NULL;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
}
-/*
- * Remove the entry with the given name from dir, recursing into
- * subdirectories as necessary. If refname is the name of a directory
- * (i.e., ends with '/'), then remove the directory and its contents.
- * If the removal was successful, return the number of entries
- * remaining in the directory entry that contained the deleted entry.
- * If the name was not found, return -1. Please note that this
- * function only deletes the entry from the cache; it does not delete
- * it from the filesystem or ensure that other cache entries (which
- * might be symbolic references to the removed entry) are updated.
- * Nor does it remove any containing dir entries that might be made
- * empty by the removal. dir must represent the top-level directory
- * and must already be complete.
- */
-static int remove_entry(struct ref_dir *dir, const char *refname)
+void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
{
- int refname_len = strlen(refname);
- int entry_index;
- struct ref_entry *entry;
- int is_dir = refname[refname_len - 1] == '/';
- if (is_dir) {
- /*
- * refname represents a reference directory. Remove
- * the trailing slash; otherwise we will get the
- * directory *representing* refname rather than the
- * one *containing* it.
- */
- char *dirname = xmemdupz(refname, refname_len - 1);
- dir = find_containing_dir(dir, dirname, 0);
- free(dirname);
- } else {
- dir = find_containing_dir(dir, refname, 0);
- }
- if (!dir)
- return -1;
- entry_index = search_ref_dir(dir, refname, refname_len);
- if (entry_index == -1)
- return -1;
- entry = dir->entries[entry_index];
+ struct warn_if_dangling_data data;
- memmove(&dir->entries[entry_index],
- &dir->entries[entry_index + 1],
- (dir->nr - entry_index - 1) * sizeof(*dir->entries)
- );
- dir->nr--;
- if (dir->sorted > entry_index)
- dir->sorted--;
- free_ref_entry(entry);
- return dir->nr;
+ data.fp = fp;
+ data.refname = NULL;
+ data.refnames = refnames;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
}
-/*
- * Add a ref_entry to the ref_dir (unsorted), recursing into
- * subdirectories as necessary. dir must represent the top-level
- * directory. Return 0 on success.
- */
-static int add_ref(struct ref_dir *dir, struct ref_entry *ref)
+int refs_for_each_tag_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
{
- dir = find_containing_dir(dir, ref->name, 1);
- if (!dir)
- return -1;
- add_entry_to_dir(dir, ref);
- return 0;
+ return refs_for_each_ref_in(refs, "refs/tags/", fn, cb_data);
}
-/*
- * Emit a warning and return true iff ref1 and ref2 have the same name
- * and the same sha1. Die if they have the same name but different
- * sha1s.
- */
-static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
+int for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
- if (strcmp(ref1->name, ref2->name))
- return 0;
-
- /* Duplicate name; make sure that they don't conflict: */
-
- if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR))
- /* This is impossible by construction */
- die("Reference directory conflict: %s", ref1->name);
-
- if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1))
- die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
-
- warning("Duplicated ref: %s", ref1->name);
- return 1;
+ return refs_for_each_tag_ref(get_main_ref_store(), fn, cb_data);
}
-/*
- * Sort the entries in dir non-recursively (if they are not already
- * sorted) and remove any duplicate entries.
- */
-static void sort_ref_dir(struct ref_dir *dir)
+int refs_for_each_branch_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
{
- int i, j;
- struct ref_entry *last = NULL;
-
- /*
- * This check also prevents passing a zero-length array to qsort(),
- * which is a problem on some platforms.
- */
- if (dir->sorted == dir->nr)
- return;
-
- qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp);
-
- /* Remove any duplicates: */
- for (i = 0, j = 0; j < dir->nr; j++) {
- struct ref_entry *entry = dir->entries[j];
- if (last && is_dup_ref(last, entry))
- free_ref_entry(entry);
- else
- last = dir->entries[i++] = entry;
- }
- dir->sorted = dir->nr = i;
+ return refs_for_each_ref_in(refs, "refs/heads/", fn, cb_data);
}
-/* Include broken references in a do_for_each_ref*() iteration: */
-#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
-
-/*
- * Return true iff the reference described by entry can be resolved to
- * an object in the database. Emit a warning if the referred-to
- * object does not exist.
- */
-static int ref_resolves_to_object(struct ref_entry *entry)
+int for_each_branch_ref(each_ref_fn fn, void *cb_data)
{
- if (entry->flag & REF_ISBROKEN)
- return 0;
- if (!has_sha1_file(entry->u.value.sha1)) {
- error("%s does not point to a valid object!", entry->name);
- return 0;
- }
- return 1;
+ return refs_for_each_branch_ref(get_main_ref_store(), fn, cb_data);
}
-/*
- * current_ref is a performance hack: when iterating over references
- * using the for_each_ref*() functions, current_ref is set to the
- * current reference's entry before calling the callback function. If
- * the callback function calls peel_ref(), then peel_ref() first
- * checks whether the reference to be peeled is the current reference
- * (it usually is) and if so, returns that reference's peeled version
- * if it is available. This avoids a refname lookup in a common case.
- */
-static struct ref_entry *current_ref;
-
-typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data);
-
-struct ref_entry_cb {
- const char *base;
- int trim;
- int flags;
- each_ref_fn *fn;
- void *cb_data;
-};
-
-/*
- * Handle one reference in a do_for_each_ref*()-style iteration,
- * calling an each_ref_fn for each entry.
- */
-static int do_one_ref(struct ref_entry *entry, void *cb_data)
+int refs_for_each_remote_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
{
- struct ref_entry_cb *data = cb_data;
- struct ref_entry *old_current_ref;
- int retval;
-
- if (!starts_with(entry->name, data->base))
- return 0;
-
- if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
- !ref_resolves_to_object(entry))
- return 0;
-
- /* Store the old value, in case this is a recursive call: */
- old_current_ref = current_ref;
- current_ref = entry;
- retval = data->fn(entry->name + data->trim, entry->u.value.sha1,
- entry->flag, data->cb_data);
- current_ref = old_current_ref;
- return retval;
+ return refs_for_each_ref_in(refs, "refs/remotes/", fn, cb_data);
}
-/*
- * Call fn for each reference in dir that has index in the range
- * offset <= index < dir->nr. Recurse into subdirectories that are in
- * that index range, sorting them before iterating. This function
- * does not sort dir itself; it should be sorted beforehand. fn is
- * called for all references, including broken ones.
- */
-static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset,
- each_ref_entry_fn fn, void *cb_data)
+int for_each_remote_ref(each_ref_fn fn, void *cb_data)
{
- int i;
- assert(dir->sorted == dir->nr);
- for (i = offset; i < dir->nr; i++) {
- struct ref_entry *entry = dir->entries[i];
- int retval;
- if (entry->flag & REF_DIR) {
- struct ref_dir *subdir = get_ref_dir(entry);
- sort_ref_dir(subdir);
- retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data);
- } else {
- retval = fn(entry, cb_data);
- }
- if (retval)
- return retval;
- }
- return 0;
+ return refs_for_each_remote_ref(get_main_ref_store(), fn, cb_data);
}
-/*
- * Call fn for each reference in the union of dir1 and dir2, in order
- * by refname. Recurse into subdirectories. If a value entry appears
- * in both dir1 and dir2, then only process the version that is in
- * dir2. The input dirs must already be sorted, but subdirs will be
- * sorted as needed. fn is called for all references, including
- * broken ones.
- */
-static int do_for_each_entry_in_dirs(struct ref_dir *dir1,
- struct ref_dir *dir2,
- each_ref_entry_fn fn, void *cb_data)
+int head_ref_namespaced(each_ref_fn fn, void *cb_data)
{
- int retval;
- int i1 = 0, i2 = 0;
+ struct strbuf buf = STRBUF_INIT;
+ int ret = 0;
+ struct object_id oid;
+ int flag;
- assert(dir1->sorted == dir1->nr);
- assert(dir2->sorted == dir2->nr);
- while (1) {
- struct ref_entry *e1, *e2;
- int cmp;
- if (i1 == dir1->nr) {
- return do_for_each_entry_in_dir(dir2, i2, fn, cb_data);
- }
- if (i2 == dir2->nr) {
- return do_for_each_entry_in_dir(dir1, i1, fn, cb_data);
- }
- e1 = dir1->entries[i1];
- e2 = dir2->entries[i2];
- cmp = strcmp(e1->name, e2->name);
- if (cmp == 0) {
- if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) {
- /* Both are directories; descend them in parallel. */
- struct ref_dir *subdir1 = get_ref_dir(e1);
- struct ref_dir *subdir2 = get_ref_dir(e2);
- sort_ref_dir(subdir1);
- sort_ref_dir(subdir2);
- retval = do_for_each_entry_in_dirs(
- subdir1, subdir2, fn, cb_data);
- i1++;
- i2++;
- } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) {
- /* Both are references; ignore the one from dir1. */
- retval = fn(e2, cb_data);
- i1++;
- i2++;
- } else {
- die("conflict between reference and directory: %s",
- e1->name);
- }
- } else {
- struct ref_entry *e;
- if (cmp < 0) {
- e = e1;
- i1++;
- } else {
- e = e2;
- i2++;
- }
- if (e->flag & REF_DIR) {
- struct ref_dir *subdir = get_ref_dir(e);
- sort_ref_dir(subdir);
- retval = do_for_each_entry_in_dir(
- subdir, 0, fn, cb_data);
- } else {
- retval = fn(e, cb_data);
- }
- }
- if (retval)
- return retval;
- }
-}
+ strbuf_addf(&buf, "%sHEAD", get_git_namespace());
+ if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag))
+ ret = fn(buf.buf, &oid, flag, cb_data);
+ strbuf_release(&buf);
-/*
- * Load all of the refs from the dir into our in-memory cache. The hard work
- * of loading loose refs is done by get_ref_dir(), so we just need to recurse
- * through all of the sub-directories. We do not even need to care about
- * sorting, as traversal order does not matter to us.
- */
-static void prime_ref_dir(struct ref_dir *dir)
-{
- int i;
- for (i = 0; i < dir->nr; i++) {
- struct ref_entry *entry = dir->entries[i];
- if (entry->flag & REF_DIR)
- prime_ref_dir(get_ref_dir(entry));
- }
+ return ret;
}
-/*
- * Return true iff refname1 and refname2 conflict with each other.
- * Two reference names conflict if one of them exactly matches the
- * leading components of the other; e.g., "foo/bar" conflicts with
- * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
- * "foo/barbados".
- */
-static int names_conflict(const char *refname1, const char *refname2)
+
+int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
+ const char *prefix, void *cb_data)
{
- for (; *refname1 && *refname1 == *refname2; refname1++, refname2++)
- ;
- return (*refname1 == '\0' && *refname2 == '/')
- || (*refname1 == '/' && *refname2 == '\0');
-}
+ struct strbuf real_pattern = STRBUF_INIT;
+ struct ref_filter filter;
+ int ret;
-struct name_conflict_cb {
- const char *refname;
- const char *oldrefname;
- const char *conflicting_refname;
-};
+ if (!prefix && !starts_with(pattern, "refs/"))
+ strbuf_addstr(&real_pattern, "refs/");
+ else if (prefix)
+ strbuf_addstr(&real_pattern, prefix);
+ strbuf_addstr(&real_pattern, pattern);
-static int name_conflict_fn(struct ref_entry *entry, void *cb_data)
-{
- struct name_conflict_cb *data = (struct name_conflict_cb *)cb_data;
- if (data->oldrefname && !strcmp(data->oldrefname, entry->name))
- return 0;
- if (names_conflict(data->refname, entry->name)) {
- data->conflicting_refname = entry->name;
- return 1;
+ if (!has_glob_specials(pattern)) {
+ /* Append implied '/' '*' if not present. */
+ strbuf_complete(&real_pattern, '/');
+ /* No need to check for '*', there is none. */
+ strbuf_addch(&real_pattern, '*');
}
- return 0;
-}
-/*
- * Return true iff a reference named refname could be created without
- * conflicting with the name of an existing reference in dir. If
- * oldrefname is non-NULL, ignore potential conflicts with oldrefname
- * (e.g., because oldrefname is scheduled for deletion in the same
- * operation).
- */
-static int is_refname_available(const char *refname, const char *oldrefname,
- struct ref_dir *dir)
-{
- struct name_conflict_cb data;
- data.refname = refname;
- data.oldrefname = oldrefname;
- data.conflicting_refname = NULL;
+ filter.pattern = real_pattern.buf;
+ filter.fn = fn;
+ filter.cb_data = cb_data;
+ ret = for_each_ref(filter_refs, &filter);
- sort_ref_dir(dir);
- if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data)) {
- error("'%s' exists; cannot create '%s'",
- data.conflicting_refname, refname);
- return 0;
- }
- return 1;
+ strbuf_release(&real_pattern);
+ return ret;
}
-struct packed_ref_cache {
- struct ref_entry *root;
-
- /*
- * Count of references to the data structure in this instance,
- * including the pointer from ref_cache::packed if any. The
- * data will not be freed as long as the reference count is
- * nonzero.
- */
- unsigned int referrers;
+int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
+{
+ return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
+}
- /*
- * Iff the packed-refs file associated with this instance is
- * currently locked for writing, this points at the associated
- * lock (which is owned by somebody else). The referrer count
- * is also incremented when the file is locked and decremented
- * when it is unlocked.
- */
- struct lock_file *lock;
+const char *prettify_refname(const char *name)
+{
+ if (skip_prefix(name, "refs/heads/", &name) ||
+ skip_prefix(name, "refs/tags/", &name) ||
+ skip_prefix(name, "refs/remotes/", &name))
+ ; /* nothing */
+ return name;
+}
- /* The metadata from when this packed-refs cache was read */
- struct stat_validity validity;
+static const char *ref_rev_parse_rules[] = {
+ "%.*s",
+ "refs/%.*s",
+ "refs/tags/%.*s",
+ "refs/heads/%.*s",
+ "refs/remotes/%.*s",
+ "refs/remotes/%.*s/HEAD",
+ NULL
};
-/*
- * Future: need to be in "struct repository"
- * when doing a full libification.
- */
-static struct ref_cache {
- struct ref_cache *next;
- struct ref_entry *loose;
- struct packed_ref_cache *packed;
- /*
- * The submodule name, or "" for the main repo. We allocate
- * length 1 rather than FLEX_ARRAY so that the main ref_cache
- * is initialized correctly.
- */
- char name[1];
-} ref_cache, *submodule_ref_caches;
+int refname_match(const char *abbrev_name, const char *full_name)
+{
+ const char **p;
+ const int abbrev_name_len = strlen(abbrev_name);
-/* Lock used for the main packed-refs file: */
-static struct lock_file packlock;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
+ return 1;
+ }
+ }
-/*
- * Increment the reference count of *packed_refs.
- */
-static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
-{
- packed_refs->referrers++;
+ return 0;
}
/*
- * Decrease the reference count of *packed_refs. If it goes to zero,
- * free *packed_refs and return true; otherwise return false.
+ * *string and *len will only be substituted, and *string returned (for
+ * later free()ing) if the string passed in is a magic short-hand form
+ * to name a branch.
*/
-static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
-{
- if (!--packed_refs->referrers) {
- free_ref_entry(packed_refs->root);
- stat_validity_clear(&packed_refs->validity);
- free(packed_refs);
- return 1;
- } else {
- return 0;
- }
-}
-
-static void clear_packed_ref_cache(struct ref_cache *refs)
+static char *substitute_branch_name(const char **string, int *len)
{
- if (refs->packed) {
- struct packed_ref_cache *packed_refs = refs->packed;
+ struct strbuf buf = STRBUF_INIT;
+ int ret = interpret_branch_name(*string, *len, &buf, 0);
- if (packed_refs->lock)
- die("internal error: packed-ref cache cleared while locked");
- refs->packed = NULL;
- release_packed_ref_cache(packed_refs);
+ if (ret == *len) {
+ size_t size;
+ *string = strbuf_detach(&buf, &size);
+ *len = size;
+ return (char *)*string;
}
-}
-static void clear_loose_ref_cache(struct ref_cache *refs)
-{
- if (refs->loose) {
- free_ref_entry(refs->loose);
- refs->loose = NULL;
- }
+ return NULL;
}
-static struct ref_cache *create_ref_cache(const char *submodule)
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
{
- int len;
- struct ref_cache *refs;
- if (!submodule)
- submodule = "";
- len = strlen(submodule) + 1;
- refs = xcalloc(1, sizeof(struct ref_cache) + len);
- memcpy(refs->name, submodule, len);
- return refs;
+ char *last_branch = substitute_branch_name(&str, &len);
+ int refs_found = expand_ref(str, len, sha1, ref);
+ free(last_branch);
+ return refs_found;
}
-/*
- * Return a pointer to a ref_cache for the specified submodule. For
- * the main repository, use submodule==NULL. The returned structure
- * will be allocated and initialized but not necessarily populated; it
- * should not be freed.
- */
-static struct ref_cache *get_ref_cache(const char *submodule)
+int expand_ref(const char *str, int len, unsigned char *sha1, char **ref)
{
- struct ref_cache *refs;
-
- if (!submodule || !*submodule)
- return &ref_cache;
+ const char **p, *r;
+ int refs_found = 0;
+ struct strbuf fullref = STRBUF_INIT;
- for (refs = submodule_ref_caches; refs; refs = refs->next)
- if (!strcmp(submodule, refs->name))
- return refs;
+ *ref = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ unsigned char sha1_from_ref[20];
+ unsigned char *this_result;
+ int flag;
- refs = create_ref_cache(submodule);
- refs->next = submodule_ref_caches;
- submodule_ref_caches = refs;
- return refs;
+ this_result = refs_found ? sha1_from_ref : sha1;
+ strbuf_reset(&fullref);
+ strbuf_addf(&fullref, *p, len, str);
+ r = resolve_ref_unsafe(fullref.buf, RESOLVE_REF_READING,
+ this_result, &flag);
+ if (r) {
+ if (!refs_found++)
+ *ref = xstrdup(r);
+ if (!warn_ambiguous_refs)
+ break;
+ } else if ((flag & REF_ISSYMREF) && strcmp(fullref.buf, "HEAD")) {
+ warning("ignoring dangling symref %s.", fullref.buf);
+ } else if ((flag & REF_ISBROKEN) && strchr(fullref.buf, '/')) {
+ warning("ignoring broken ref %s.", fullref.buf);
+ }
+ }
+ strbuf_release(&fullref);
+ return refs_found;
}
-/* The length of a peeled reference line in packed-refs, including EOL: */
-#define PEELED_LINE_LENGTH 42
-
-/*
- * The packed-refs header line that we write out. Perhaps other
- * traits will be added later. The trailing space is required.
- */
-static const char PACKED_REFS_HEADER[] =
- "# pack-refs with: peeled fully-peeled \n";
-
-/*
- * Parse one line from a packed-refs file. Write the SHA1 to sha1.
- * Return a pointer to the refname within the line (null-terminated),
- * or NULL if there was a problem.
- */
-static const char *parse_ref_line(char *line, unsigned char *sha1)
+int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
{
- /*
- * 42: the answer to everything.
- *
- * In this case, it happens to be the answer to
- * 40 (length of sha1 hex representation)
- * +1 (space in between hex and name)
- * +1 (newline at the end of the line)
- */
- int len = strlen(line) - 42;
-
- if (len <= 0)
- return NULL;
- if (get_sha1_hex(line, sha1) < 0)
- return NULL;
- if (!isspace(line[40]))
- return NULL;
- line += 41;
- if (isspace(*line))
- return NULL;
- if (line[len] != '\n')
- return NULL;
- line[len] = 0;
+ char *last_branch = substitute_branch_name(&str, &len);
+ const char **p;
+ int logs_found = 0;
+ struct strbuf path = STRBUF_INIT;
- return line;
-}
+ *log = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ unsigned char hash[20];
+ const char *ref, *it;
-/*
- * Read f, which is a packed-refs file, into dir.
- *
- * A comment line of the form "# pack-refs with: " may contain zero or
- * more traits. We interpret the traits as follows:
- *
- * No traits:
- *
- * Probably no references are peeled. But if the file contains a
- * peeled value for a reference, we will use it.
- *
- * peeled:
- *
- * References under "refs/tags/", if they *can* be peeled, *are*
- * peeled in this file. References outside of "refs/tags/" are
- * probably not peeled even if they could have been, but if we find
- * a peeled value for such a reference we will use it.
- *
- * fully-peeled:
- *
- * All references in the file that can be peeled are peeled.
- * Inversely (and this is more important), any references in the
- * file for which no peeled value is recorded is not peelable. This
- * trait should typically be written alongside "peeled" for
- * compatibility with older clients, but we do not require it
- * (i.e., "peeled" is a no-op if "fully-peeled" is set).
- */
-static void read_packed_refs(FILE *f, struct ref_dir *dir)
-{
- struct ref_entry *last = NULL;
- char refline[PATH_MAX];
- enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
-
- while (fgets(refline, sizeof(refline), f)) {
- unsigned char sha1[20];
- const char *refname;
- static const char header[] = "# pack-refs with:";
-
- if (!strncmp(refline, header, sizeof(header)-1)) {
- const char *traits = refline + sizeof(header) - 1;
- if (strstr(traits, " fully-peeled "))
- peeled = PEELED_FULLY;
- else if (strstr(traits, " peeled "))
- peeled = PEELED_TAGS;
- /* perhaps other traits later as well */
+ strbuf_reset(&path);
+ strbuf_addf(&path, *p, len, str);
+ ref = resolve_ref_unsafe(path.buf, RESOLVE_REF_READING,
+ hash, NULL);
+ if (!ref)
continue;
- }
-
- refname = parse_ref_line(refline, sha1);
- if (refname) {
- last = create_ref_entry(refname, sha1, REF_ISPACKED, 1);
- if (peeled == PEELED_FULLY ||
- (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
- last->flag |= REF_KNOWS_PEELED;
- add_ref(dir, last);
+ if (reflog_exists(path.buf))
+ it = path.buf;
+ else if (strcmp(ref, path.buf) && reflog_exists(ref))
+ it = ref;
+ else
continue;
+ if (!logs_found++) {
+ *log = xstrdup(it);
+ hashcpy(sha1, hash);
}
- if (last &&
- refline[0] == '^' &&
- strlen(refline) == PEELED_LINE_LENGTH &&
- refline[PEELED_LINE_LENGTH - 1] == '\n' &&
- !get_sha1_hex(refline + 1, sha1)) {
- hashcpy(last->u.value.peeled, sha1);
- /*
- * Regardless of what the file header said,
- * we definitely know the value of *this*
- * reference:
- */
- last->flag |= REF_KNOWS_PEELED;
- }
+ if (!warn_ambiguous_refs)
+ break;
}
+ strbuf_release(&path);
+ free(last_branch);
+ return logs_found;
}
-/*
- * Get the packed_ref_cache for the specified ref_cache, creating it
- * if necessary.
- */
-static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs)
+static int is_per_worktree_ref(const char *refname)
{
- const char *packed_refs_file;
-
- if (*refs->name)
- packed_refs_file = git_path_submodule(refs->name, "packed-refs");
- else
- packed_refs_file = git_path("packed-refs");
-
- if (refs->packed &&
- !stat_validity_check(&refs->packed->validity, packed_refs_file))
- clear_packed_ref_cache(refs);
-
- if (!refs->packed) {
- FILE *f;
-
- refs->packed = xcalloc(1, sizeof(*refs->packed));
- acquire_packed_ref_cache(refs->packed);
- refs->packed->root = create_dir_entry(refs, "", 0, 0);
- f = fopen(packed_refs_file, "r");
- if (f) {
- stat_validity_update(&refs->packed->validity, fileno(f));
- read_packed_refs(f, get_ref_dir(refs->packed->root));
- fclose(f);
- }
- }
- return refs->packed;
+ return !strcmp(refname, "HEAD") ||
+ starts_with(refname, "refs/bisect/");
}
-static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
+static int is_pseudoref_syntax(const char *refname)
{
- return get_ref_dir(packed_ref_cache->root);
+ const char *c;
+
+ for (c = refname; *c; c++) {
+ if (!isupper(*c) && *c != '-' && *c != '_')
+ return 0;
+ }
+
+ return 1;
}
-static struct ref_dir *get_packed_refs(struct ref_cache *refs)
+enum ref_type ref_type(const char *refname)
{
- return get_packed_ref_dir(get_packed_ref_cache(refs));
+ if (is_per_worktree_ref(refname))
+ return REF_TYPE_PER_WORKTREE;
+ if (is_pseudoref_syntax(refname))
+ return REF_TYPE_PSEUDOREF;
+ return REF_TYPE_NORMAL;
}
-void add_packed_ref(const char *refname, const unsigned char *sha1)
+long get_files_ref_lock_timeout_ms(void)
{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
+ static int configured = 0;
+
+ /* The default timeout is 100 ms: */
+ static int timeout_ms = 100;
+
+ if (!configured) {
+ git_config_get_int("core.filesreflocktimeout", &timeout_ms);
+ configured = 1;
+ }
- if (!packed_ref_cache->lock)
- die("internal error: packed refs not locked");
- add_ref(get_packed_ref_dir(packed_ref_cache),
- create_ref_entry(refname, sha1, REF_ISPACKED, 1));
+ return timeout_ms;
}
-/*
- * Read the loose references from the namespace dirname into dir
- * (without recursing). dirname must end with '/'. dir must be the
- * directory entry corresponding to dirname.
- */
-static void read_loose_refs(const char *dirname, struct ref_dir *dir)
+static int write_pseudoref(const char *pseudoref, const unsigned char *sha1,
+ const unsigned char *old_sha1, struct strbuf *err)
{
- struct ref_cache *refs = dir->ref_cache;
- DIR *d;
- const char *path;
- struct dirent *de;
- int dirnamelen = strlen(dirname);
- struct strbuf refname;
-
- if (*refs->name)
- path = git_path_submodule(refs->name, "%s", dirname);
- else
- path = git_path("%s", dirname);
+ const char *filename;
+ int fd;
+ static struct lock_file lock;
+ struct strbuf buf = STRBUF_INIT;
+ int ret = -1;
- d = opendir(path);
- if (!d)
- return;
+ strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1));
- strbuf_init(&refname, dirnamelen + 257);
- strbuf_add(&refname, dirname, dirnamelen);
+ filename = git_path("%s", pseudoref);
+ fd = hold_lock_file_for_update_timeout(&lock, filename,
+ LOCK_DIE_ON_ERROR,
+ get_files_ref_lock_timeout_ms());
+ if (fd < 0) {
+ strbuf_addf(err, "could not open '%s' for writing: %s",
+ filename, strerror(errno));
+ goto done;
+ }
- while ((de = readdir(d)) != NULL) {
- unsigned char sha1[20];
- struct stat st;
- int flag;
- const char *refdir;
+ if (old_sha1) {
+ unsigned char actual_old_sha1[20];
- if (de->d_name[0] == '.')
- continue;
- if (has_extension(de->d_name, ".lock"))
- continue;
- strbuf_addstr(&refname, de->d_name);
- refdir = *refs->name
- ? git_path_submodule(refs->name, "%s", refname.buf)
- : git_path("%s", refname.buf);
- if (stat(refdir, &st) < 0) {
- ; /* silently ignore */
- } else if (S_ISDIR(st.st_mode)) {
- strbuf_addch(&refname, '/');
- add_entry_to_dir(dir,
- create_dir_entry(refs, refname.buf,
- refname.len, 1));
- } else {
- if (*refs->name) {
- hashclr(sha1);
- flag = 0;
- if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) {
- hashclr(sha1);
- flag |= REF_ISBROKEN;
- }
- } else if (read_ref_full(refname.buf, sha1, 1, &flag)) {
- hashclr(sha1);
- flag |= REF_ISBROKEN;
- }
- add_entry_to_dir(dir,
- create_ref_entry(refname.buf, sha1, flag, 1));
+ if (read_ref(pseudoref, actual_old_sha1))
+ die("could not read ref '%s'", pseudoref);
+ if (hashcmp(actual_old_sha1, old_sha1)) {
+ strbuf_addf(err, "unexpected sha1 when writing '%s'", pseudoref);
+ rollback_lock_file(&lock);
+ goto done;
}
- strbuf_setlen(&refname, dirnamelen);
}
- strbuf_release(&refname);
- closedir(d);
-}
-static struct ref_dir *get_loose_refs(struct ref_cache *refs)
-{
- if (!refs->loose) {
- /*
- * Mark the top-level directory complete because we
- * are about to read the only subdirectory that can
- * hold references:
- */
- refs->loose = create_dir_entry(refs, "", 0, 0);
- /*
- * Create an incomplete entry for "refs/":
- */
- add_entry_to_dir(get_ref_dir(refs->loose),
- create_dir_entry(refs, "refs/", 5, 1));
+ if (write_in_full(fd, buf.buf, buf.len) < 0) {
+ strbuf_addf(err, "could not write to '%s'", filename);
+ rollback_lock_file(&lock);
+ goto done;
}
- return get_ref_dir(refs->loose);
-}
-
-/* We allow "recursive" symbolic refs. Only within reason, though */
-#define MAXDEPTH 5
-#define MAXREFLEN (1024)
-/*
- * Called by resolve_gitlink_ref_recursive() after it failed to read
- * from the loose refs in ref_cache refs. Find <refname> in the
- * packed-refs file for the submodule.
- */
-static int resolve_gitlink_packed_ref(struct ref_cache *refs,
- const char *refname, unsigned char *sha1)
-{
- struct ref_entry *ref;
- struct ref_dir *dir = get_packed_refs(refs);
-
- ref = find_ref(dir, refname);
- if (ref == NULL)
- return -1;
-
- hashcpy(sha1, ref->u.value.sha1);
- return 0;
+ commit_lock_file(&lock);
+ ret = 0;
+done:
+ strbuf_release(&buf);
+ return ret;
}
-static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
- const char *refname, unsigned char *sha1,
- int recursion)
+static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1)
{
- int fd, len;
- char buffer[128], *p;
- char *path;
+ static struct lock_file lock;
+ const char *filename;
- if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
- return -1;
- path = *refs->name
- ? git_path_submodule(refs->name, "%s", refname)
- : git_path("%s", refname);
- fd = open(path, O_RDONLY);
- if (fd < 0)
- return resolve_gitlink_packed_ref(refs, refname, sha1);
-
- len = read(fd, buffer, sizeof(buffer)-1);
- close(fd);
- if (len < 0)
- return -1;
- while (len && isspace(buffer[len-1]))
- len--;
- buffer[len] = 0;
+ filename = git_path("%s", pseudoref);
- /* Was it a detached head or an old-fashioned symlink? */
- if (!get_sha1_hex(buffer, sha1))
- return 0;
+ if (old_sha1 && !is_null_sha1(old_sha1)) {
+ int fd;
+ unsigned char actual_old_sha1[20];
+
+ fd = hold_lock_file_for_update_timeout(
+ &lock, filename, LOCK_DIE_ON_ERROR,
+ get_files_ref_lock_timeout_ms());
+ if (fd < 0)
+ die_errno(_("Could not open '%s' for writing"), filename);
+ if (read_ref(pseudoref, actual_old_sha1))
+ die("could not read ref '%s'", pseudoref);
+ if (hashcmp(actual_old_sha1, old_sha1)) {
+ warning("Unexpected sha1 when deleting %s", pseudoref);
+ rollback_lock_file(&lock);
+ return -1;
+ }
- /* Symref? */
- if (strncmp(buffer, "ref:", 4))
- return -1;
- p = buffer + 4;
- while (isspace(*p))
- p++;
+ unlink(filename);
+ rollback_lock_file(&lock);
+ } else {
+ unlink(filename);
+ }
- return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
+ return 0;
}
-int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
+int refs_delete_ref(struct ref_store *refs, const char *msg,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags)
{
- int len = strlen(path), retval;
- char *submodule;
- struct ref_cache *refs;
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
- while (len && path[len-1] == '/')
- len--;
- if (!len)
- return -1;
- submodule = xstrndup(path, len);
- refs = get_ref_cache(submodule);
- free(submodule);
+ if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
+ assert(refs == get_main_ref_store());
+ return delete_pseudoref(refname, old_sha1);
+ }
- retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
- return retval;
+ transaction = ref_store_transaction_begin(refs, &err);
+ if (!transaction ||
+ ref_transaction_delete(transaction, refname, old_sha1,
+ flags, msg, &err) ||
+ ref_transaction_commit(transaction, &err)) {
+ error("%s", err.buf);
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 1;
+ }
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 0;
}
-/*
- * Return the ref_entry for the given refname from the packed
- * references. If it does not exist, return NULL.
- */
-static struct ref_entry *get_packed_ref(const char *refname)
+int delete_ref(const char *msg, const char *refname,
+ const unsigned char *old_sha1, unsigned int flags)
{
- return find_ref(get_packed_refs(&ref_cache), refname);
+ return refs_delete_ref(get_main_ref_store(), msg, refname,
+ old_sha1, flags);
}
-/*
- * A loose ref file doesn't exist; check for a packed ref. The
- * options are forwarded from resolve_safe_unsafe().
- */
-static const char *handle_missing_loose_ref(const char *refname,
- unsigned char *sha1,
- int reading,
- int *flag)
+int copy_reflog_msg(char *buf, const char *msg)
{
- struct ref_entry *entry;
-
- /*
- * The loose reference file does not exist; check for a packed
- * reference.
- */
- entry = get_packed_ref(refname);
- if (entry) {
- hashcpy(sha1, entry->u.value.sha1);
- if (flag)
- *flag |= REF_ISPACKED;
- return refname;
- }
- /* The reference is not a packed reference, either. */
- if (reading) {
- return NULL;
- } else {
- hashclr(sha1);
- return refname;
- }
-}
-
-const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag)
-{
- int depth = MAXDEPTH;
- ssize_t len;
- char buffer[256];
- static char refname_buffer[256];
-
- if (flag)
- *flag = 0;
-
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
- return NULL;
-
- for (;;) {
- char path[PATH_MAX];
- struct stat st;
- char *buf;
- int fd;
-
- if (--depth < 0)
- return NULL;
-
- git_snpath(path, sizeof(path), "%s", refname);
-
- /*
- * We might have to loop back here to avoid a race
- * condition: first we lstat() the file, then we try
- * to read it as a link or as a file. But if somebody
- * changes the type of the file (file <-> directory
- * <-> symlink) between the lstat() and reading, then
- * we don't want to report that as an error but rather
- * try again starting with the lstat().
- */
- stat_ref:
- if (lstat(path, &st) < 0) {
- if (errno == ENOENT)
- return handle_missing_loose_ref(refname, sha1,
- reading, flag);
- else
- return NULL;
- }
-
- /* Follow "normalized" - ie "refs/.." symlinks by hand */
- if (S_ISLNK(st.st_mode)) {
- len = readlink(path, buffer, sizeof(buffer)-1);
- if (len < 0) {
- if (errno == ENOENT || errno == EINVAL)
- /* inconsistent with lstat; retry */
- goto stat_ref;
- else
- return NULL;
- }
- buffer[len] = 0;
- if (starts_with(buffer, "refs/") &&
- !check_refname_format(buffer, 0)) {
- strcpy(refname_buffer, buffer);
- refname = refname_buffer;
- if (flag)
- *flag |= REF_ISSYMREF;
- continue;
- }
- }
-
- /* Is it a directory? */
- if (S_ISDIR(st.st_mode)) {
- errno = EISDIR;
- return NULL;
- }
-
- /*
- * Anything else, just open it and try to use it as
- * a ref
- */
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- if (errno == ENOENT)
- /* inconsistent with lstat; retry */
- goto stat_ref;
- else
- return NULL;
- }
- len = read_in_full(fd, buffer, sizeof(buffer)-1);
- close(fd);
- if (len < 0)
- return NULL;
- while (len && isspace(buffer[len-1]))
- len--;
- buffer[len] = '\0';
+ char *cp = buf;
+ char c;
+ int wasspace = 1;
- /*
- * Is it a symbolic ref?
- */
- if (!starts_with(buffer, "ref:")) {
- /*
- * Please note that FETCH_HEAD has a second
- * line containing other data.
- */
- if (get_sha1_hex(buffer, sha1) ||
- (buffer[40] != '\0' && !isspace(buffer[40]))) {
- if (flag)
- *flag |= REF_ISBROKEN;
- return NULL;
- }
- return refname;
- }
- if (flag)
- *flag |= REF_ISSYMREF;
- buf = buffer + 4;
- while (isspace(*buf))
- buf++;
- if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
- if (flag)
- *flag |= REF_ISBROKEN;
- return NULL;
- }
- refname = strcpy(refname_buffer, buf);
+ *cp++ = '\t';
+ while ((c = *msg++)) {
+ if (wasspace && isspace(c))
+ continue;
+ wasspace = isspace(c);
+ if (wasspace)
+ c = ' ';
+ *cp++ = c;
}
+ while (buf < cp && isspace(cp[-1]))
+ cp--;
+ *cp++ = '\n';
+ return cp - buf;
}
-char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
-{
- const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
- return ret ? xstrdup(ret) : NULL;
-}
-
-/* The argument to filter_refs */
-struct ref_filter {
- const char *pattern;
- each_ref_fn *fn;
- void *cb_data;
-};
-
-int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
+int should_autocreate_reflog(const char *refname)
{
- if (resolve_ref_unsafe(refname, sha1, reading, flags))
+ switch (log_all_ref_updates) {
+ case LOG_REFS_ALWAYS:
+ return 1;
+ case LOG_REFS_NORMAL:
+ return starts_with(refname, "refs/heads/") ||
+ starts_with(refname, "refs/remotes/") ||
+ starts_with(refname, "refs/notes/") ||
+ !strcmp(refname, "HEAD");
+ default:
return 0;
- return -1;
-}
-
-int read_ref(const char *refname, unsigned char *sha1)
-{
- return read_ref_full(refname, sha1, 1, NULL);
-}
-
-int ref_exists(const char *refname)
-{
- unsigned char sha1[20];
- return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
+ }
}
-static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
- void *data)
+int is_branch(const char *refname)
{
- struct ref_filter *filter = (struct ref_filter *)data;
- if (wildmatch(filter->pattern, refname, 0, NULL))
- return 0;
- return filter->fn(refname, sha1, flags, filter->cb_data);
+ return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
}
-enum peel_status {
- /* object was peeled successfully: */
- PEEL_PEELED = 0,
-
- /*
- * object cannot be peeled because the named object (or an
- * object referred to by a tag in the peel chain), does not
- * exist.
- */
- PEEL_INVALID = -1,
-
- /* object cannot be peeled because it is not a tag: */
- PEEL_NON_TAG = -2,
-
- /* ref_entry contains no peeled value because it is a symref: */
- PEEL_IS_SYMREF = -3,
-
- /*
- * ref_entry cannot be peeled because it is broken (i.e., the
- * symbolic reference cannot even be resolved to an object
- * name):
- */
- PEEL_BROKEN = -4
+struct read_ref_at_cb {
+ const char *refname;
+ timestamp_t at_time;
+ int cnt;
+ int reccnt;
+ unsigned char *sha1;
+ int found_it;
+
+ unsigned char osha1[20];
+ unsigned char nsha1[20];
+ int tz;
+ timestamp_t date;
+ char **msg;
+ timestamp_t *cutoff_time;
+ int *cutoff_tz;
+ int *cutoff_cnt;
};
-/*
- * Peel the named object; i.e., if the object is a tag, resolve the
- * tag recursively until a non-tag is found. If successful, store the
- * result to sha1 and return PEEL_PEELED. If the object is not a tag
- * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively,
- * and leave sha1 unchanged.
- */
-static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
-{
- struct object *o = lookup_unknown_object(name);
-
- if (o->type == OBJ_NONE) {
- int type = sha1_object_info(name, NULL);
- if (type < 0 || !object_as_type(o, type, 0))
- return PEEL_INVALID;
- }
-
- if (o->type != OBJ_TAG)
- return PEEL_NON_TAG;
-
- o = deref_tag_noverify(o);
- if (!o)
- return PEEL_INVALID;
-
- hashcpy(sha1, o->sha1);
- return PEEL_PEELED;
-}
-
-/*
- * Peel the entry (if possible) and return its new peel_status. If
- * repeel is true, re-peel the entry even if there is an old peeled
- * value that is already stored in it.
- *
- * It is OK to call this function with a packed reference entry that
- * might be stale and might even refer to an object that has since
- * been garbage-collected. In such a case, if the entry has
- * REF_KNOWS_PEELED then leave the status unchanged and return
- * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID.
- */
-static enum peel_status peel_entry(struct ref_entry *entry, int repeel)
-{
- enum peel_status status;
-
- if (entry->flag & REF_KNOWS_PEELED) {
- if (repeel) {
- entry->flag &= ~REF_KNOWS_PEELED;
- hashclr(entry->u.value.peeled);
- } else {
- return is_null_sha1(entry->u.value.peeled) ?
- PEEL_NON_TAG : PEEL_PEELED;
+static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid,
+ const char *email, timestamp_t timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+
+ cb->reccnt++;
+ cb->tz = tz;
+ cb->date = timestamp;
+
+ if (timestamp <= cb->at_time || cb->cnt == 0) {
+ if (cb->msg)
+ *cb->msg = xstrdup(message);
+ if (cb->cutoff_time)
+ *cb->cutoff_time = timestamp;
+ if (cb->cutoff_tz)
+ *cb->cutoff_tz = tz;
+ if (cb->cutoff_cnt)
+ *cb->cutoff_cnt = cb->reccnt - 1;
+ /*
+ * we have not yet updated cb->[n|o]sha1 so they still
+ * hold the values for the previous record.
+ */
+ if (!is_null_sha1(cb->osha1)) {
+ hashcpy(cb->sha1, noid->hash);
+ if (hashcmp(cb->osha1, noid->hash))
+ warning("Log for ref %s has gap after %s.",
+ cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
}
+ else if (cb->date == cb->at_time)
+ hashcpy(cb->sha1, noid->hash);
+ else if (hashcmp(noid->hash, cb->sha1))
+ warning("Log for ref %s unexpectedly ended on %s.",
+ cb->refname, show_date(cb->date, cb->tz,
+ DATE_MODE(RFC2822)));
+ hashcpy(cb->osha1, ooid->hash);
+ hashcpy(cb->nsha1, noid->hash);
+ cb->found_it = 1;
+ return 1;
}
- if (entry->flag & REF_ISBROKEN)
- return PEEL_BROKEN;
- if (entry->flag & REF_ISSYMREF)
- return PEEL_IS_SYMREF;
+ hashcpy(cb->osha1, ooid->hash);
+ hashcpy(cb->nsha1, noid->hash);
+ if (cb->cnt > 0)
+ cb->cnt--;
+ return 0;
+}
- status = peel_object(entry->u.value.sha1, entry->u.value.peeled);
- if (status == PEEL_PEELED || status == PEEL_NON_TAG)
- entry->flag |= REF_KNOWS_PEELED;
- return status;
+static int read_ref_at_ent_oldest(struct object_id *ooid, struct object_id *noid,
+ const char *email, timestamp_t timestamp,
+ int tz, const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+
+ if (cb->msg)
+ *cb->msg = xstrdup(message);
+ if (cb->cutoff_time)
+ *cb->cutoff_time = timestamp;
+ if (cb->cutoff_tz)
+ *cb->cutoff_tz = tz;
+ if (cb->cutoff_cnt)
+ *cb->cutoff_cnt = cb->reccnt;
+ hashcpy(cb->sha1, ooid->hash);
+ if (is_null_sha1(cb->sha1))
+ hashcpy(cb->sha1, noid->hash);
+ /* We just want the first entry */
+ return 1;
}
-int peel_ref(const char *refname, unsigned char *sha1)
+int read_ref_at(const char *refname, unsigned int flags, timestamp_t at_time, int cnt,
+ unsigned char *sha1, char **msg,
+ timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
{
- int flag;
- unsigned char base[20];
+ struct read_ref_at_cb cb;
- if (current_ref && (current_ref->name == refname
- || !strcmp(current_ref->name, refname))) {
- if (peel_entry(current_ref, 0))
- return -1;
- hashcpy(sha1, current_ref->u.value.peeled);
- return 0;
- }
+ memset(&cb, 0, sizeof(cb));
+ cb.refname = refname;
+ cb.at_time = at_time;
+ cb.cnt = cnt;
+ cb.msg = msg;
+ cb.cutoff_time = cutoff_time;
+ cb.cutoff_tz = cutoff_tz;
+ cb.cutoff_cnt = cutoff_cnt;
+ cb.sha1 = sha1;
- if (read_ref_full(refname, base, 1, &flag))
- return -1;
+ for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
- /*
- * If the reference is packed, read its ref_entry from the
- * cache in the hope that we already know its peeled value.
- * We only try this optimization on packed references because
- * (a) forcing the filling of the loose reference cache could
- * be expensive and (b) loose references anyway usually do not
- * have REF_KNOWS_PEELED.
- */
- if (flag & REF_ISPACKED) {
- struct ref_entry *r = get_packed_ref(refname);
- if (r) {
- if (peel_entry(r, 0))
- return -1;
- hashcpy(sha1, r->u.value.peeled);
- return 0;
- }
+ if (!cb.reccnt) {
+ if (flags & GET_OID_QUIETLY)
+ exit(128);
+ else
+ die("Log for %s is empty.", refname);
}
-
- return peel_object(base, sha1);
-}
-
-struct warn_if_dangling_data {
- FILE *fp;
- const char *refname;
- const struct string_list *refnames;
- const char *msg_fmt;
-};
-
-static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
- int flags, void *cb_data)
-{
- struct warn_if_dangling_data *d = cb_data;
- const char *resolves_to;
- unsigned char junk[20];
-
- if (!(flags & REF_ISSYMREF))
+ if (cb.found_it)
return 0;
- resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
- if (!resolves_to
- || (d->refname
- ? strcmp(resolves_to, d->refname)
- : !string_list_has_string(d->refnames, resolves_to))) {
- return 0;
- }
+ for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
- fprintf(d->fp, d->msg_fmt, refname);
- fputc('\n', d->fp);
- return 0;
+ return 1;
}
-void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
+struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs,
+ struct strbuf *err)
{
- struct warn_if_dangling_data data;
+ struct ref_transaction *tr;
+ assert(err);
- data.fp = fp;
- data.refname = refname;
- data.refnames = NULL;
- data.msg_fmt = msg_fmt;
- for_each_rawref(warn_if_dangling_symref, &data);
+ tr = xcalloc(1, sizeof(struct ref_transaction));
+ tr->ref_store = refs;
+ return tr;
}
-void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
+struct ref_transaction *ref_transaction_begin(struct strbuf *err)
{
- struct warn_if_dangling_data data;
-
- data.fp = fp;
- data.refname = NULL;
- data.refnames = refnames;
- data.msg_fmt = msg_fmt;
- for_each_rawref(warn_if_dangling_symref, &data);
+ return ref_store_transaction_begin(get_main_ref_store(), err);
}
-/*
- * Call fn for each reference in the specified ref_cache, omitting
- * references not in the containing_dir of base. fn is called for all
- * references, including broken ones. If fn ever returns a non-zero
- * value, stop the iteration and return that value; otherwise, return
- * 0.
- */
-static int do_for_each_entry(struct ref_cache *refs, const char *base,
- each_ref_entry_fn fn, void *cb_data)
+void ref_transaction_free(struct ref_transaction *transaction)
{
- struct packed_ref_cache *packed_ref_cache;
- struct ref_dir *loose_dir;
- struct ref_dir *packed_dir;
- int retval = 0;
+ size_t i;
- /*
- * We must make sure that all loose refs are read before accessing the
- * packed-refs file; this avoids a race condition in which loose refs
- * are migrated to the packed-refs file by a simultaneous process, but
- * our in-memory view is from before the migration. get_packed_ref_cache()
- * takes care of making sure our view is up to date with what is on
- * disk.
- */
- loose_dir = get_loose_refs(refs);
- if (base && *base) {
- loose_dir = find_containing_dir(loose_dir, base, 0);
- }
- if (loose_dir)
- prime_ref_dir(loose_dir);
-
- packed_ref_cache = get_packed_ref_cache(refs);
- acquire_packed_ref_cache(packed_ref_cache);
- packed_dir = get_packed_ref_dir(packed_ref_cache);
- if (base && *base) {
- packed_dir = find_containing_dir(packed_dir, base, 0);
- }
+ if (!transaction)
+ return;
- if (packed_dir && loose_dir) {
- sort_ref_dir(packed_dir);
- sort_ref_dir(loose_dir);
- retval = do_for_each_entry_in_dirs(
- packed_dir, loose_dir, fn, cb_data);
- } else if (packed_dir) {
- sort_ref_dir(packed_dir);
- retval = do_for_each_entry_in_dir(
- packed_dir, 0, fn, cb_data);
- } else if (loose_dir) {
- sort_ref_dir(loose_dir);
- retval = do_for_each_entry_in_dir(
- loose_dir, 0, fn, cb_data);
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ case REF_TRANSACTION_CLOSED:
+ /* OK */
+ break;
+ case REF_TRANSACTION_PREPARED:
+ die("BUG: free called on a prepared reference transaction");
+ break;
+ default:
+ die("BUG: unexpected reference transaction state");
+ break;
}
- release_packed_ref_cache(packed_ref_cache);
- return retval;
-}
-
-/*
- * Call fn for each reference in the specified ref_cache for which the
- * refname begins with base. If trim is non-zero, then trim that many
- * characters off the beginning of each refname before passing the
- * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include
- * broken references in the iteration. If fn ever returns a non-zero
- * value, stop the iteration and return that value; otherwise, return
- * 0.
- */
-static int do_for_each_ref(struct ref_cache *refs, const char *base,
- each_ref_fn fn, int trim, int flags, void *cb_data)
-{
- struct ref_entry_cb data;
- data.base = base;
- data.trim = trim;
- data.flags = flags;
- data.fn = fn;
- data.cb_data = cb_data;
-
- return do_for_each_entry(refs, base, do_one_ref, &data);
-}
-
-static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- unsigned char sha1[20];
- int flag;
-
- if (submodule) {
- if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
- return fn("HEAD", sha1, 0, cb_data);
-
- return 0;
+ for (i = 0; i < transaction->nr; i++) {
+ free(transaction->updates[i]->msg);
+ free(transaction->updates[i]);
}
-
- if (!read_ref_full("HEAD", sha1, 1, &flag))
- return fn("HEAD", sha1, flag, cb_data);
-
- return 0;
+ free(transaction->updates);
+ free(transaction);
}
-int head_ref(each_ref_fn fn, void *cb_data)
+struct ref_update *ref_transaction_add_update(
+ struct ref_transaction *transaction,
+ const char *refname, unsigned int flags,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ const char *msg)
{
- return do_head_ref(NULL, fn, cb_data);
-}
+ struct ref_update *update;
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(submodule, fn, cb_data);
-}
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: update called for transaction that is not open");
-int for_each_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
-}
+ if ((flags & REF_ISPRUNING) && !(flags & REF_NODEREF))
+ die("BUG: REF_ISPRUNING set without REF_NODEREF");
-int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data);
-}
+ FLEX_ALLOC_STR(update, refname, refname);
+ ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
+ transaction->updates[transaction->nr++] = update;
-int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data);
-}
+ update->flags = flags;
-int for_each_ref_in_submodule(const char *submodule, const char *prefix,
- each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data);
+ if (flags & REF_HAVE_NEW)
+ hashcpy(update->new_oid.hash, new_sha1);
+ if (flags & REF_HAVE_OLD)
+ hashcpy(update->old_oid.hash, old_sha1);
+ update->msg = xstrdup_or_null(msg);
+ return update;
}
-int for_each_tag_ref(each_ref_fn fn, void *cb_data)
+int ref_transaction_update(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ unsigned int flags, const char *msg,
+ struct strbuf *err)
{
- return for_each_ref_in("refs/tags/", fn, cb_data);
-}
+ assert(err);
-int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
-}
+ if ((new_sha1 && !is_null_sha1(new_sha1)) ?
+ check_refname_format(refname, REFNAME_ALLOW_ONELEVEL) :
+ !refname_is_safe(refname)) {
+ strbuf_addf(err, "refusing to update ref with bad name '%s'",
+ refname);
+ return -1;
+ }
-int for_each_branch_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/heads/", fn, cb_data);
-}
+ flags &= REF_TRANSACTION_UPDATE_ALLOWED_FLAGS;
-int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
-}
+ flags |= (new_sha1 ? REF_HAVE_NEW : 0) | (old_sha1 ? REF_HAVE_OLD : 0);
-int for_each_remote_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/remotes/", fn, cb_data);
+ ref_transaction_add_update(transaction, refname, flags,
+ new_sha1, old_sha1, msg);
+ return 0;
}
-int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
+int ref_transaction_create(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ unsigned int flags, const char *msg,
+ struct strbuf *err)
{
- return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
+ if (!new_sha1 || is_null_sha1(new_sha1))
+ die("BUG: create called without valid new_sha1");
+ return ref_transaction_update(transaction, refname, new_sha1,
+ null_sha1, flags, msg, err);
}
-int for_each_replace_ref(each_ref_fn fn, void *cb_data)
+int ref_transaction_delete(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags, const char *msg,
+ struct strbuf *err)
{
- return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data);
+ if (old_sha1 && is_null_sha1(old_sha1))
+ die("BUG: delete called with old_sha1 set to zeros");
+ return ref_transaction_update(transaction, refname,
+ null_sha1, old_sha1,
+ flags, msg, err);
}
-int head_ref_namespaced(each_ref_fn fn, void *cb_data)
+int ref_transaction_verify(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags,
+ struct strbuf *err)
{
- struct strbuf buf = STRBUF_INIT;
- int ret = 0;
- unsigned char sha1[20];
- int flag;
-
- strbuf_addf(&buf, "%sHEAD", get_git_namespace());
- if (!read_ref_full(buf.buf, sha1, 1, &flag))
- ret = fn(buf.buf, sha1, flag, cb_data);
- strbuf_release(&buf);
-
- return ret;
+ if (!old_sha1)
+ die("BUG: verify called with old_sha1 set to NULL");
+ return ref_transaction_update(transaction, refname,
+ NULL, old_sha1,
+ flags, NULL, err);
}
-int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
+int update_ref_oid(const char *msg, const char *refname,
+ const struct object_id *new_oid, const struct object_id *old_oid,
+ unsigned int flags, enum action_on_err onerr)
{
- struct strbuf buf = STRBUF_INIT;
- int ret;
- strbuf_addf(&buf, "%srefs/", get_git_namespace());
- ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data);
- strbuf_release(&buf);
- return ret;
+ return update_ref(msg, refname, new_oid ? new_oid->hash : NULL,
+ old_oid ? old_oid->hash : NULL, flags, onerr);
}
-int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
- const char *prefix, void *cb_data)
+int refs_update_ref(struct ref_store *refs, const char *msg,
+ const char *refname, const unsigned char *new_sha1,
+ const unsigned char *old_sha1, unsigned int flags,
+ enum action_on_err onerr)
{
- struct strbuf real_pattern = STRBUF_INIT;
- struct ref_filter filter;
- int ret;
-
- if (!prefix && !starts_with(pattern, "refs/"))
- strbuf_addstr(&real_pattern, "refs/");
- else if (prefix)
- strbuf_addstr(&real_pattern, prefix);
- strbuf_addstr(&real_pattern, pattern);
+ struct ref_transaction *t = NULL;
+ struct strbuf err = STRBUF_INIT;
+ int ret = 0;
- if (!has_glob_specials(pattern)) {
- /* Append implied '/' '*' if not present. */
- if (real_pattern.buf[real_pattern.len - 1] != '/')
- strbuf_addch(&real_pattern, '/');
- /* No need to check for '*', there is none. */
- strbuf_addch(&real_pattern, '*');
+ if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
+ assert(refs == get_main_ref_store());
+ ret = write_pseudoref(refname, new_sha1, old_sha1, &err);
+ } else {
+ t = ref_store_transaction_begin(refs, &err);
+ if (!t ||
+ ref_transaction_update(t, refname, new_sha1, old_sha1,
+ flags, msg, &err) ||
+ ref_transaction_commit(t, &err)) {
+ ret = 1;
+ ref_transaction_free(t);
+ }
}
+ if (ret) {
+ const char *str = "update_ref failed for ref '%s': %s";
- filter.pattern = real_pattern.buf;
- filter.fn = fn;
- filter.cb_data = cb_data;
- ret = for_each_ref(filter_refs, &filter);
-
- strbuf_release(&real_pattern);
- return ret;
+ switch (onerr) {
+ case UPDATE_REFS_MSG_ON_ERR:
+ error(str, refname, err.buf);
+ break;
+ case UPDATE_REFS_DIE_ON_ERR:
+ die(str, refname, err.buf);
+ break;
+ case UPDATE_REFS_QUIET_ON_ERR:
+ break;
+ }
+ strbuf_release(&err);
+ return 1;
+ }
+ strbuf_release(&err);
+ if (t)
+ ref_transaction_free(t);
+ return 0;
}
-int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
+int update_ref(const char *msg, const char *refname,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ unsigned int flags, enum action_on_err onerr)
{
- return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
+ return refs_update_ref(get_main_ref_store(), msg, refname, new_sha1,
+ old_sha1, flags, onerr);
}
-int for_each_rawref(each_ref_fn fn, void *cb_data)
+char *shorten_unambiguous_ref(const char *refname, int strict)
{
- return do_for_each_ref(&ref_cache, "", fn, 0,
- DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
-}
+ int i;
+ static char **scanf_fmts;
+ static int nr_rules;
+ char *short_name;
+ struct strbuf resolved_buf = STRBUF_INIT;
-const char *prettify_refname(const char *name)
-{
- return name + (
- starts_with(name, "refs/heads/") ? 11 :
- starts_with(name, "refs/tags/") ? 10 :
- starts_with(name, "refs/remotes/") ? 13 :
- 0);
-}
+ if (!nr_rules) {
+ /*
+ * Pre-generate scanf formats from ref_rev_parse_rules[].
+ * Generate a format suitable for scanf from a
+ * ref_rev_parse_rules rule by interpolating "%s" at the
+ * location of the "%.*s".
+ */
+ size_t total_len = 0;
+ size_t offset = 0;
-static const char *ref_rev_parse_rules[] = {
- "%.*s",
- "refs/%.*s",
- "refs/tags/%.*s",
- "refs/heads/%.*s",
- "refs/remotes/%.*s",
- "refs/remotes/%.*s/HEAD",
- NULL
-};
+ /* the rule list is NULL terminated, count them first */
+ for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++)
+ /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */
+ total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1;
-int refname_match(const char *abbrev_name, const char *full_name)
-{
- const char **p;
- const int abbrev_name_len = strlen(abbrev_name);
+ scanf_fmts = xmalloc(st_add(st_mult(sizeof(char *), nr_rules), total_len));
- for (p = ref_rev_parse_rules; *p; p++) {
- if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
- return 1;
+ offset = 0;
+ for (i = 0; i < nr_rules; i++) {
+ assert(offset < total_len);
+ scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
+ offset += snprintf(scanf_fmts[i], total_len - offset,
+ ref_rev_parse_rules[i], 2, "%s") + 1;
}
}
- return 0;
-}
-
-static struct ref_lock *verify_lock(struct ref_lock *lock,
- const unsigned char *old_sha1, int mustexist)
-{
- if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
- error("Can't verify ref %s", lock->ref_name);
- unlock_ref(lock);
- return NULL;
- }
- if (hashcmp(lock->old_sha1, old_sha1)) {
- error("Ref %s is at %s but expected %s", lock->ref_name,
- sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
- unlock_ref(lock);
- return NULL;
- }
- return lock;
-}
-
-static int remove_empty_directories(const char *file)
-{
- /* we want to create a file but there is a directory there;
- * if that is an empty directory (or a directory that contains
- * only empty directories), remove them.
- */
- struct strbuf path;
- int result;
-
- strbuf_init(&path, 20);
- strbuf_addstr(&path, file);
-
- result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
+ /* bail out if there are no rules */
+ if (!nr_rules)
+ return xstrdup(refname);
- strbuf_release(&path);
+ /* buffer for scanf result, at most refname must fit */
+ short_name = xstrdup(refname);
- return result;
-}
+ /* skip first rule, it will always match */
+ for (i = nr_rules - 1; i > 0 ; --i) {
+ int j;
+ int rules_to_fail = i;
+ int short_name_len;
-/*
- * *string and *len will only be substituted, and *string returned (for
- * later free()ing) if the string passed in is a magic short-hand form
- * to name a branch.
- */
-static char *substitute_branch_name(const char **string, int *len)
-{
- struct strbuf buf = STRBUF_INIT;
- int ret = interpret_branch_name(*string, *len, &buf);
+ if (1 != sscanf(refname, scanf_fmts[i], short_name))
+ continue;
- if (ret == *len) {
- size_t size;
- *string = strbuf_detach(&buf, &size);
- *len = size;
- return (char *)*string;
- }
+ short_name_len = strlen(short_name);
- return NULL;
-}
+ /*
+ * in strict mode, all (except the matched one) rules
+ * must fail to resolve to a valid non-ambiguous ref
+ */
+ if (strict)
+ rules_to_fail = nr_rules;
-int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
-{
- char *last_branch = substitute_branch_name(&str, &len);
- const char **p, *r;
- int refs_found = 0;
+ /*
+ * check if the short name resolves to a valid ref,
+ * but use only rules prior to the matched one
+ */
+ for (j = 0; j < rules_to_fail; j++) {
+ const char *rule = ref_rev_parse_rules[j];
- *ref = NULL;
- for (p = ref_rev_parse_rules; *p; p++) {
- char fullref[PATH_MAX];
- unsigned char sha1_from_ref[20];
- unsigned char *this_result;
- int flag;
+ /* skip matched rule */
+ if (i == j)
+ continue;
- this_result = refs_found ? sha1_from_ref : sha1;
- mksnpath(fullref, sizeof(fullref), *p, len, str);
- r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
- if (r) {
- if (!refs_found++)
- *ref = xstrdup(r);
- if (!warn_ambiguous_refs)
+ /*
+ * the short name is ambiguous, if it resolves
+ * (with this previous rule) to a valid ref
+ * read_ref() returns 0 on success
+ */
+ strbuf_reset(&resolved_buf);
+ strbuf_addf(&resolved_buf, rule,
+ short_name_len, short_name);
+ if (ref_exists(resolved_buf.buf))
break;
- } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
- warning("ignoring dangling symref %s.", fullref);
- } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
- warning("ignoring broken ref %s.", fullref);
+ }
+
+ /*
+ * short name is non-ambiguous if all previous rules
+ * haven't resolved to a valid ref
+ */
+ if (j == rules_to_fail) {
+ strbuf_release(&resolved_buf);
+ return short_name;
}
}
- free(last_branch);
- return refs_found;
+
+ strbuf_release(&resolved_buf);
+ free(short_name);
+ return xstrdup(refname);
}
-int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
-{
- char *last_branch = substitute_branch_name(&str, &len);
- const char **p;
- int logs_found = 0;
+static struct string_list *hide_refs;
- *log = NULL;
- for (p = ref_rev_parse_rules; *p; p++) {
- struct stat st;
- unsigned char hash[20];
- char path[PATH_MAX];
- const char *ref, *it;
+int parse_hide_refs_config(const char *var, const char *value, const char *section)
+{
+ const char *key;
+ if (!strcmp("transfer.hiderefs", var) ||
+ (!parse_config_key(var, section, NULL, NULL, &key) &&
+ !strcmp(key, "hiderefs"))) {
+ char *ref;
+ int len;
- mksnpath(path, sizeof(path), *p, len, str);
- ref = resolve_ref_unsafe(path, hash, 1, NULL);
- if (!ref)
- continue;
- if (!stat(git_path("logs/%s", path), &st) &&
- S_ISREG(st.st_mode))
- it = path;
- else if (strcmp(ref, path) &&
- !stat(git_path("logs/%s", ref), &st) &&
- S_ISREG(st.st_mode))
- it = ref;
- else
- continue;
- if (!logs_found++) {
- *log = xstrdup(it);
- hashcpy(sha1, hash);
+ if (!value)
+ return config_error_nonbool(var);
+ ref = xstrdup(value);
+ len = strlen(ref);
+ while (len && ref[len - 1] == '/')
+ ref[--len] = '\0';
+ if (!hide_refs) {
+ hide_refs = xcalloc(1, sizeof(*hide_refs));
+ hide_refs->strdup_strings = 1;
}
- if (!warn_ambiguous_refs)
- break;
+ string_list_append(hide_refs, ref);
}
- free(last_branch);
- return logs_found;
+ return 0;
}
-static struct ref_lock *lock_ref_sha1_basic(const char *refname,
- const unsigned char *old_sha1,
- int flags, int *type_p)
-{
- char *ref_file;
- const char *orig_refname = refname;
- struct ref_lock *lock;
- int last_errno = 0;
- int type, lflags;
- int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
- int missing = 0;
- int attempts_remaining = 3;
-
- lock = xcalloc(1, sizeof(struct ref_lock));
- lock->lock_fd = -1;
-
- refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type);
- if (!refname && errno == EISDIR) {
- /* we are trying to lock foo but we used to
- * have foo/bar which now does not exist;
- * it is normal for the empty directory 'foo'
- * to remain.
- */
- ref_file = git_path("%s", orig_refname);
- if (remove_empty_directories(ref_file)) {
- last_errno = errno;
- error("there are still refs under '%s'", orig_refname);
- goto error_return;
- }
- refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type);
- }
- if (type_p)
- *type_p = type;
- if (!refname) {
- last_errno = errno;
- error("unable to resolve reference %s: %s",
- orig_refname, strerror(errno));
- goto error_return;
- }
- missing = is_null_sha1(lock->old_sha1);
- /* When the ref did not exist and we are creating it,
- * make sure there is no existing ref that is packed
- * whose name begins with our refname, nor a ref whose
- * name is a proper prefix of our refname.
- */
- if (missing &&
- !is_refname_available(refname, NULL, get_packed_refs(&ref_cache))) {
- last_errno = ENOTDIR;
- goto error_return;
- }
+int ref_is_hidden(const char *refname, const char *refname_full)
+{
+ int i;
- lock->lk = xcalloc(1, sizeof(struct lock_file));
+ if (!hide_refs)
+ return 0;
+ for (i = hide_refs->nr - 1; i >= 0; i--) {
+ const char *match = hide_refs->items[i].string;
+ const char *subject;
+ int neg = 0;
+ const char *p;
+
+ if (*match == '!') {
+ neg = 1;
+ match++;
+ }
- lflags = 0;
- if (flags & REF_NODEREF) {
- refname = orig_refname;
- lflags |= LOCK_NODEREF;
- }
- lock->ref_name = xstrdup(refname);
- lock->orig_ref_name = xstrdup(orig_refname);
- ref_file = git_path("%s", refname);
- if (missing)
- lock->force_write = 1;
- if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
- lock->force_write = 1;
-
- retry:
- switch (safe_create_leading_directories(ref_file)) {
- case SCLD_OK:
- break; /* success */
- case SCLD_VANISHED:
- if (--attempts_remaining > 0)
- goto retry;
- /* fall through */
- default:
- last_errno = errno;
- error("unable to create directory for %s", ref_file);
- goto error_return;
- }
+ if (*match == '^') {
+ subject = refname_full;
+ match++;
+ } else {
+ subject = refname;
+ }
- lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
- if (lock->lock_fd < 0) {
- if (errno == ENOENT && --attempts_remaining > 0)
- /*
- * Maybe somebody just deleted one of the
- * directories leading to ref_file. Try
- * again:
- */
- goto retry;
- else
- unable_to_lock_index_die(ref_file, errno);
+ /* refname can be NULL when namespaces are used. */
+ if (subject &&
+ skip_prefix(subject, match, &p) &&
+ (!*p || *p == '/'))
+ return !neg;
}
- return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
-
- error_return:
- unlock_ref(lock);
- errno = last_errno;
- return NULL;
+ return 0;
}
-struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
+const char *find_descendant_ref(const char *dirname,
+ const struct string_list *extras,
+ const struct string_list *skip)
{
- char refpath[PATH_MAX];
- if (check_refname_format(refname, 0))
- return NULL;
- strcpy(refpath, mkpath("refs/%s", refname));
- return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
-}
+ int pos;
-struct ref_lock *lock_any_ref_for_update(const char *refname,
- const unsigned char *old_sha1,
- int flags, int *type_p)
-{
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
+ if (!extras)
return NULL;
- return lock_ref_sha1_basic(refname, old_sha1, flags, type_p);
-}
-/*
- * Write an entry to the packed-refs file for the specified refname.
- * If peeled is non-NULL, write it as the entry's peeled value.
- */
-static void write_packed_entry(int fd, char *refname, unsigned char *sha1,
- unsigned char *peeled)
-{
- char line[PATH_MAX + 100];
- int len;
-
- len = snprintf(line, sizeof(line), "%s %s\n",
- sha1_to_hex(sha1), refname);
- /* this should not happen but just being defensive */
- if (len > sizeof(line))
- die("too long a refname '%s'", refname);
- write_or_die(fd, line, len);
-
- if (peeled) {
- if (snprintf(line, sizeof(line), "^%s\n",
- sha1_to_hex(peeled)) != PEELED_LINE_LENGTH)
- die("internal error");
- write_or_die(fd, line, PEELED_LINE_LENGTH);
+ /*
+ * Look at the place where dirname would be inserted into
+ * extras. If there is an entry at that position that starts
+ * with dirname (remember, dirname includes the trailing
+ * slash) and is not in skip, then we have a conflict.
+ */
+ for (pos = string_list_find_insert_index(extras, dirname, 0);
+ pos < extras->nr; pos++) {
+ const char *extra_refname = extras->items[pos].string;
+
+ if (!starts_with(extra_refname, dirname))
+ break;
+
+ if (!skip || !string_list_has_string(skip, extra_refname))
+ return extra_refname;
}
+ return NULL;
}
-/*
- * An each_ref_entry_fn that writes the entry to a packed-refs file.
- */
-static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data)
+int refs_rename_ref_available(struct ref_store *refs,
+ const char *old_refname,
+ const char *new_refname)
{
- int *fd = cb_data;
- enum peel_status peel_status = peel_entry(entry, 0);
+ struct string_list skip = STRING_LIST_INIT_NODUP;
+ struct strbuf err = STRBUF_INIT;
+ int ok;
- if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
- error("internal error: %s is not a valid packed reference!",
- entry->name);
- write_packed_entry(*fd, entry->name, entry->u.value.sha1,
- peel_status == PEEL_PEELED ?
- entry->u.value.peeled : NULL);
- return 0;
+ string_list_insert(&skip, old_refname);
+ ok = !refs_verify_refname_available(refs, new_refname,
+ NULL, &skip, &err);
+ if (!ok)
+ error("%s", err.buf);
+
+ string_list_clear(&skip, 0);
+ strbuf_release(&err);
+ return ok;
}
-int lock_packed_refs(int flags)
+int refs_head_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
{
- struct packed_ref_cache *packed_ref_cache;
+ struct object_id oid;
+ int flag;
+
+ if (!refs_read_ref_full(refs, "HEAD", RESOLVE_REF_READING,
+ oid.hash, &flag))
+ return fn("HEAD", &oid, flag, cb_data);
- if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0)
- return -1;
- /*
- * Get the current packed-refs while holding the lock. If the
- * packed-refs file has been modified since we last read it,
- * this will automatically invalidate the cache and re-read
- * the packed-refs file.
- */
- packed_ref_cache = get_packed_ref_cache(&ref_cache);
- packed_ref_cache->lock = &packlock;
- /* Increment the reference count to prevent it from being freed: */
- acquire_packed_ref_cache(packed_ref_cache);
return 0;
}
-int commit_packed_refs(void)
+int head_ref(each_ref_fn fn, void *cb_data)
{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
- int error = 0;
-
- if (!packed_ref_cache->lock)
- die("internal error: packed-refs not locked");
- write_or_die(packed_ref_cache->lock->fd,
- PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER));
-
- do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
- 0, write_packed_entry_fn,
- &packed_ref_cache->lock->fd);
- if (commit_lock_file(packed_ref_cache->lock))
- error = -1;
- packed_ref_cache->lock = NULL;
- release_packed_ref_cache(packed_ref_cache);
- return error;
+ return refs_head_ref(get_main_ref_store(), fn, cb_data);
}
-void rollback_packed_refs(void)
+struct ref_iterator *refs_ref_iterator_begin(
+ struct ref_store *refs,
+ const char *prefix, int trim, int flags)
{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
+ struct ref_iterator *iter;
- if (!packed_ref_cache->lock)
- die("internal error: packed-refs not locked");
- rollback_lock_file(packed_ref_cache->lock);
- packed_ref_cache->lock = NULL;
- release_packed_ref_cache(packed_ref_cache);
- clear_packed_ref_cache(&ref_cache);
-}
+ if (ref_paranoia < 0)
+ ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0);
+ if (ref_paranoia)
+ flags |= DO_FOR_EACH_INCLUDE_BROKEN;
-struct ref_to_prune {
- struct ref_to_prune *next;
- unsigned char sha1[20];
- char name[FLEX_ARRAY];
-};
+ iter = refs->be->iterator_begin(refs, prefix, flags);
-struct pack_refs_cb_data {
- unsigned int flags;
- struct ref_dir *packed_refs;
- struct ref_to_prune *ref_to_prune;
-};
+ /*
+ * `iterator_begin()` already takes care of prefix, but we
+ * might need to do some trimming:
+ */
+ if (trim)
+ iter = prefix_ref_iterator_begin(iter, "", trim);
+
+ /* Sanity check for subclasses: */
+ if (!iter->ordered)
+ BUG("reference iterator is not ordered");
+
+ return iter;
+}
/*
- * An each_ref_entry_fn that is run over loose references only. If
- * the loose reference can be packed, add an entry in the packed ref
- * cache. If the reference should be pruned, also add it to
- * ref_to_prune in the pack_refs_cb_data.
+ * Call fn for each reference in the specified submodule for which the
+ * refname begins with prefix. If trim is non-zero, then trim that
+ * many characters off the beginning of each refname before passing
+ * the refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to
+ * include broken references in the iteration. If fn ever returns a
+ * non-zero value, stop the iteration and return that value;
+ * otherwise, return 0.
*/
-static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data)
+static int do_for_each_ref(struct ref_store *refs, const char *prefix,
+ each_ref_fn fn, int trim, int flags, void *cb_data)
{
- struct pack_refs_cb_data *cb = cb_data;
- enum peel_status peel_status;
- struct ref_entry *packed_entry;
- int is_tag_ref = starts_with(entry->name, "refs/tags/");
+ struct ref_iterator *iter;
- /* ALWAYS pack tags */
- if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref)
+ if (!refs)
return 0;
- /* Do not pack symbolic or broken refs: */
- if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry))
- return 0;
+ iter = refs_ref_iterator_begin(refs, prefix, trim, flags);
- /* Add a packed ref cache entry equivalent to the loose entry. */
- peel_status = peel_entry(entry, 1);
- if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
- die("internal error peeling reference %s (%s)",
- entry->name, sha1_to_hex(entry->u.value.sha1));
- packed_entry = find_ref(cb->packed_refs, entry->name);
- if (packed_entry) {
- /* Overwrite existing packed entry with info from loose entry */
- packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED;
- hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1);
- } else {
- packed_entry = create_ref_entry(entry->name, entry->u.value.sha1,
- REF_ISPACKED | REF_KNOWS_PEELED, 0);
- add_ref(cb->packed_refs, packed_entry);
- }
- hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled);
-
- /* Schedule the loose reference for pruning if requested. */
- if ((cb->flags & PACK_REFS_PRUNE)) {
- int namelen = strlen(entry->name) + 1;
- struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
- hashcpy(n->sha1, entry->u.value.sha1);
- strcpy(n->name, entry->name);
- n->next = cb->ref_to_prune;
- cb->ref_to_prune = n;
- }
- return 0;
+ return do_for_each_ref_iterator(iter, fn, cb_data);
}
-/*
- * Remove empty parents, but spare refs/ and immediate subdirs.
- * Note: munges *name.
- */
-static void try_remove_empty_parents(char *name)
+int refs_for_each_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
{
- char *p, *q;
- int i;
- p = name;
- for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
- while (*p && *p != '/')
- p++;
- /* tolerate duplicate slashes; see check_refname_format() */
- while (*p == '/')
- p++;
- }
- for (q = p; *q; q++)
- ;
- while (1) {
- while (q > p && *q != '/')
- q--;
- while (q > p && *(q-1) == '/')
- q--;
- if (q == p)
- break;
- *q = '\0';
- if (rmdir(git_path("%s", name)))
- break;
- }
+ return do_for_each_ref(refs, "", fn, 0, 0, cb_data);
}
-/* make sure nobody touched the ref, and unlink */
-static void prune_ref(struct ref_to_prune *r)
+int for_each_ref(each_ref_fn fn, void *cb_data)
{
- struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
+ return refs_for_each_ref(get_main_ref_store(), fn, cb_data);
+}
- if (lock) {
- unlink_or_warn(git_path("%s", r->name));
- unlock_ref(lock);
- try_remove_empty_parents(r->name);
- }
+int refs_for_each_ref_in(struct ref_store *refs, const char *prefix,
+ each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(refs, prefix, fn, strlen(prefix), 0, cb_data);
}
-static void prune_refs(struct ref_to_prune *r)
+int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
{
- while (r) {
- prune_ref(r);
- r = r->next;
- }
+ return refs_for_each_ref_in(get_main_ref_store(), prefix, fn, cb_data);
}
-int pack_refs(unsigned int flags)
+int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
{
- struct pack_refs_cb_data cbdata;
+ unsigned int flag = 0;
- memset(&cbdata, 0, sizeof(cbdata));
- cbdata.flags = flags;
+ if (broken)
+ flag = DO_FOR_EACH_INCLUDE_BROKEN;
+ return do_for_each_ref(get_main_ref_store(),
+ prefix, fn, 0, flag, cb_data);
+}
- lock_packed_refs(LOCK_DIE_ON_ERROR);
- cbdata.packed_refs = get_packed_refs(&ref_cache);
+int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix,
+ each_ref_fn fn, void *cb_data,
+ unsigned int broken)
+{
+ unsigned int flag = 0;
- do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
- pack_if_possible_fn, &cbdata);
+ if (broken)
+ flag = DO_FOR_EACH_INCLUDE_BROKEN;
+ return do_for_each_ref(refs, prefix, fn, 0, flag, cb_data);
+}
- if (commit_packed_refs())
- die_errno("unable to overwrite old ref-pack file");
+int for_each_replace_ref(each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(get_main_ref_store(),
+ git_replace_ref_base, fn,
+ strlen(git_replace_ref_base),
+ DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
+}
- prune_refs(cbdata.ref_to_prune);
- return 0;
+int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret;
+ strbuf_addf(&buf, "%srefs/", get_git_namespace());
+ ret = do_for_each_ref(get_main_ref_store(),
+ buf.buf, fn, 0, 0, cb_data);
+ strbuf_release(&buf);
+ return ret;
}
-/*
- * If entry is no longer needed in packed-refs, add it to the string
- * list pointed to by cb_data. Reasons for deleting entries:
- *
- * - Entry is broken.
- * - Entry is overridden by a loose ref.
- * - Entry does not point at a valid object.
- *
- * In the first and third cases, also emit an error message because these
- * are indications of repository corruption.
- */
-static int curate_packed_ref_fn(struct ref_entry *entry, void *cb_data)
+int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
{
- struct string_list *refs_to_delete = cb_data;
+ return do_for_each_ref(refs, "", fn, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
+}
- if (entry->flag & REF_ISBROKEN) {
- /* This shouldn't happen to packed refs. */
- error("%s is broken!", entry->name);
- string_list_append(refs_to_delete, entry->name);
- return 0;
- }
- if (!has_sha1_file(entry->u.value.sha1)) {
- unsigned char sha1[20];
- int flags;
-
- if (read_ref_full(entry->name, sha1, 0, &flags))
- /* We should at least have found the packed ref. */
- die("Internal error");
- if ((flags & REF_ISSYMREF) || !(flags & REF_ISPACKED)) {
- /*
- * This packed reference is overridden by a
- * loose reference, so it is OK that its value
- * is no longer valid; for example, it might
- * refer to an object that has been garbage
- * collected. For this purpose we don't even
- * care whether the loose reference itself is
- * invalid, broken, symbolic, etc. Silently
- * remove the packed reference.
- */
- string_list_append(refs_to_delete, entry->name);
- return 0;
- }
- /*
- * There is no overriding loose reference, so the fact
- * that this reference doesn't refer to a valid object
- * indicates some kind of repository corruption.
- * Report the problem, then omit the reference from
- * the output.
- */
- error("%s does not point to a valid object!", entry->name);
- string_list_append(refs_to_delete, entry->name);
- return 0;
- }
+int for_each_rawref(each_ref_fn fn, void *cb_data)
+{
+ return refs_for_each_rawref(get_main_ref_store(), fn, cb_data);
+}
- return 0;
+int refs_read_raw_ref(struct ref_store *ref_store,
+ const char *refname, unsigned char *sha1,
+ struct strbuf *referent, unsigned int *type)
+{
+ return ref_store->be->read_raw_ref(ref_store, refname, sha1, referent, type);
}
-int repack_without_refs(const char **refnames, int n)
+/* This function needs to return a meaningful errno on failure */
+const char *refs_resolve_ref_unsafe(struct ref_store *refs,
+ const char *refname,
+ int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- struct ref_dir *packed;
- struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
- struct string_list_item *ref_to_delete;
- int i, removed = 0;
+ static struct strbuf sb_refname = STRBUF_INIT;
+ struct object_id unused_oid;
+ int unused_flags;
+ int symref_count;
- /* Look for a packed ref */
- for (i = 0; i < n; i++)
- if (get_packed_ref(refnames[i]))
- break;
+ if (!sha1)
+ sha1 = unused_oid.hash;
+ if (!flags)
+ flags = &unused_flags;
- /* Avoid locking if we have nothing to do */
- if (i == n)
- return 0; /* no refname exists in packed refs */
+ *flags = 0;
- if (lock_packed_refs(0)) {
- unable_to_lock_error(git_path("packed-refs"), errno);
- return error("cannot delete '%s' from packed refs", refnames[i]);
- }
- packed = get_packed_refs(&ref_cache);
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
+ !refname_is_safe(refname)) {
+ errno = EINVAL;
+ return NULL;
+ }
- /* Remove refnames from the cache */
- for (i = 0; i < n; i++)
- if (remove_entry(packed, refnames[i]) != -1)
- removed = 1;
- if (!removed) {
/*
- * All packed entries disappeared while we were
- * acquiring the lock.
+ * dwim_ref() uses REF_ISBROKEN to distinguish between
+ * missing refs and refs that were present but invalid,
+ * to complain about the latter to stderr.
+ *
+ * We don't know whether the ref exists, so don't set
+ * REF_ISBROKEN yet.
*/
- rollback_packed_refs();
- return 0;
+ *flags |= REF_BAD_NAME;
}
- /* Remove any other accumulated cruft */
- do_for_each_entry_in_dir(packed, 0, curate_packed_ref_fn, &refs_to_delete);
- for_each_string_list_item(ref_to_delete, &refs_to_delete) {
- if (remove_entry(packed, ref_to_delete->string) == -1)
- die("internal error");
- }
+ for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
+ unsigned int read_flags = 0;
- /* Write what remains */
- return commit_packed_refs();
-}
+ if (refs_read_raw_ref(refs, refname,
+ sha1, &sb_refname, &read_flags)) {
+ *flags |= read_flags;
-static int repack_without_ref(const char *refname)
-{
- return repack_without_refs(&refname, 1);
-}
+ /* In reading mode, refs must eventually resolve */
+ if (resolve_flags & RESOLVE_REF_READING)
+ return NULL;
-static int delete_ref_loose(struct ref_lock *lock, int flag)
-{
- if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
- /* loose */
- int err, i = strlen(lock->lk->filename) - 5; /* .lock */
+ /*
+ * Otherwise a missing ref is OK. But the files backend
+ * may show errors besides ENOENT if there are
+ * similarly-named refs.
+ */
+ if (errno != ENOENT &&
+ errno != EISDIR &&
+ errno != ENOTDIR)
+ return NULL;
- lock->lk->filename[i] = 0;
- err = unlink_or_warn(lock->lk->filename);
- lock->lk->filename[i] = '.';
- if (err && errno != ENOENT)
- return 1;
+ hashclr(sha1);
+ if (*flags & REF_BAD_NAME)
+ *flags |= REF_ISBROKEN;
+ return refname;
+ }
+
+ *flags |= read_flags;
+
+ if (!(read_flags & REF_ISSYMREF)) {
+ if (*flags & REF_BAD_NAME) {
+ hashclr(sha1);
+ *flags |= REF_ISBROKEN;
+ }
+ return refname;
+ }
+
+ refname = sb_refname.buf;
+ if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
+ hashclr(sha1);
+ return refname;
+ }
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
+ !refname_is_safe(refname)) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ *flags |= REF_ISBROKEN | REF_BAD_NAME;
+ }
}
- return 0;
+
+ errno = ELOOP;
+ return NULL;
}
-int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
+/* backend functions */
+int refs_init_db(struct strbuf *err)
{
- struct ref_lock *lock;
- int ret = 0, flag = 0;
+ struct ref_store *refs = get_main_ref_store();
- lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag);
- if (!lock)
- return 1;
- ret |= delete_ref_loose(lock, flag);
-
- /* removing the loose one could have resurrected an earlier
- * packed one. Also, if it was not loose we need to repack
- * without it.
- */
- ret |= repack_without_ref(lock->ref_name);
-
- unlink_or_warn(git_path("logs/%s", lock->ref_name));
- clear_loose_ref_cache(&ref_cache);
- unlock_ref(lock);
- return ret;
+ return refs->be->init_db(refs, err);
}
-/*
- * People using contrib's git-new-workdir have .git/logs/refs ->
- * /some/other/path/.git/logs/refs, and that may live on another device.
- *
- * IOW, to avoid cross device rename errors, the temporary renamed log must
- * live into logs/refs.
- */
-#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
+const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
+{
+ return refs_resolve_ref_unsafe(get_main_ref_store(), refname,
+ resolve_flags, sha1, flags);
+}
-static int rename_tmp_log(const char *newrefname)
+int resolve_gitlink_ref(const char *submodule, const char *refname,
+ unsigned char *sha1)
{
- int attempts_remaining = 4;
+ struct ref_store *refs;
+ int flags;
- retry:
- switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) {
- case SCLD_OK:
- break; /* success */
- case SCLD_VANISHED:
- if (--attempts_remaining > 0)
- goto retry;
- /* fall through */
- default:
- error("unable to create directory for %s", newrefname);
+ refs = get_submodule_ref_store(submodule);
+
+ if (!refs)
return -1;
- }
- if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
- if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) {
- /*
- * rename(a, b) when b is an existing
- * directory ought to result in ISDIR, but
- * Solaris 5.8 gives ENOTDIR. Sheesh.
- */
- if (remove_empty_directories(git_path("logs/%s", newrefname))) {
- error("Directory not empty: logs/%s", newrefname);
- return -1;
- }
- goto retry;
- } else if (errno == ENOENT && --attempts_remaining > 0) {
- /*
- * Maybe another process just deleted one of
- * the directories in the path to newrefname.
- * Try again from the beginning.
- */
- goto retry;
- } else {
- error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
- newrefname, strerror(errno));
- return -1;
- }
- }
+ if (!refs_resolve_ref_unsafe(refs, refname, 0, sha1, &flags) ||
+ is_null_sha1(sha1))
+ return -1;
return 0;
}
-int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
+struct ref_store_hash_entry
{
- unsigned char sha1[20], orig_sha1[20];
- int flag = 0, logmoved = 0;
- struct ref_lock *lock;
- struct stat loginfo;
- int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
- const char *symref = NULL;
+ struct hashmap_entry ent; /* must be the first member! */
- if (log && S_ISLNK(loginfo.st_mode))
- return error("reflog for %s is a symlink", oldrefname);
+ struct ref_store *refs;
- symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag);
- if (flag & REF_ISSYMREF)
- return error("refname %s is a symbolic ref, renaming it is not supported",
- oldrefname);
- if (!symref)
- return error("refname %s not found", oldrefname);
-
- if (!is_refname_available(newrefname, oldrefname, get_packed_refs(&ref_cache)))
- return 1;
-
- if (!is_refname_available(newrefname, oldrefname, get_loose_refs(&ref_cache)))
- return 1;
+ /* NUL-terminated identifier of the ref store: */
+ char name[FLEX_ARRAY];
+};
- if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
- return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
- oldrefname, strerror(errno));
+static int ref_store_hash_cmp(const void *unused_cmp_data,
+ const void *entry, const void *entry_or_key,
+ const void *keydata)
+{
+ const struct ref_store_hash_entry *e1 = entry, *e2 = entry_or_key;
+ const char *name = keydata ? keydata : e2->name;
- if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
- error("unable to delete old %s", oldrefname);
- goto rollback;
- }
+ return strcmp(e1->name, name);
+}
- if (!read_ref_full(newrefname, sha1, 1, &flag) &&
- delete_ref(newrefname, sha1, REF_NODEREF)) {
- if (errno==EISDIR) {
- if (remove_empty_directories(git_path("%s", newrefname))) {
- error("Directory not empty: %s", newrefname);
- goto rollback;
- }
- } else {
- error("unable to delete existing %s", newrefname);
- goto rollback;
- }
- }
+static struct ref_store_hash_entry *alloc_ref_store_hash_entry(
+ const char *name, struct ref_store *refs)
+{
+ struct ref_store_hash_entry *entry;
- if (log && rename_tmp_log(newrefname))
- goto rollback;
+ FLEX_ALLOC_STR(entry, name, name);
+ hashmap_entry_init(entry, strhash(name));
+ entry->refs = refs;
+ return entry;
+}
- logmoved = log;
+/* A pointer to the ref_store for the main repository: */
+static struct ref_store *main_ref_store;
- lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
- if (!lock) {
- error("unable to lock %s for update", newrefname);
- goto rollback;
- }
- lock->force_write = 1;
- hashcpy(lock->old_sha1, orig_sha1);
- if (write_ref_sha1(lock, orig_sha1, logmsg)) {
- error("unable to write current sha1 into %s", newrefname);
- goto rollback;
- }
+/* A hashmap of ref_stores, stored by submodule name: */
+static struct hashmap submodule_ref_stores;
- return 0;
+/* A hashmap of ref_stores, stored by worktree id: */
+static struct hashmap worktree_ref_stores;
- rollback:
- lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
- if (!lock) {
- error("unable to lock %s for rollback", oldrefname);
- goto rollbacklog;
- }
+/*
+ * Look up a ref store by name. If that ref_store hasn't been
+ * registered yet, return NULL.
+ */
+static struct ref_store *lookup_ref_store_map(struct hashmap *map,
+ const char *name)
+{
+ struct ref_store_hash_entry *entry;
- lock->force_write = 1;
- flag = log_all_ref_updates;
- log_all_ref_updates = 0;
- if (write_ref_sha1(lock, orig_sha1, NULL))
- error("unable to write current sha1 into %s", oldrefname);
- log_all_ref_updates = flag;
-
- rollbacklog:
- if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
- error("unable to restore logfile %s from %s: %s",
- oldrefname, newrefname, strerror(errno));
- if (!logmoved && log &&
- rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
- error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
- oldrefname, strerror(errno));
+ if (!map->tablesize)
+ /* It's initialized on demand in register_ref_store(). */
+ return NULL;
- return 1;
+ entry = hashmap_get_from_hash(map, strhash(name), name);
+ return entry ? entry->refs : NULL;
}
-int close_ref(struct ref_lock *lock)
+/*
+ * Create, record, and return a ref_store instance for the specified
+ * gitdir.
+ */
+static struct ref_store *ref_store_init(const char *gitdir,
+ unsigned int flags)
{
- if (close_lock_file(lock->lk))
- return -1;
- lock->lock_fd = -1;
- return 0;
-}
+ const char *be_name = "files";
+ struct ref_storage_be *be = find_ref_storage_backend(be_name);
+ struct ref_store *refs;
-int commit_ref(struct ref_lock *lock)
-{
- if (commit_lock_file(lock->lk))
- return -1;
- lock->lock_fd = -1;
- return 0;
+ if (!be)
+ die("BUG: reference backend %s is unknown", be_name);
+
+ refs = be->init(gitdir, flags);
+ return refs;
}
-void unlock_ref(struct ref_lock *lock)
+struct ref_store *get_main_ref_store(void)
{
- /* Do not free lock->lk -- atexit() still looks at them */
- if (lock->lk)
- rollback_lock_file(lock->lk);
- free(lock->ref_name);
- free(lock->orig_ref_name);
- free(lock);
+ if (main_ref_store)
+ return main_ref_store;
+
+ main_ref_store = ref_store_init(get_git_dir(), REF_STORE_ALL_CAPS);
+ return main_ref_store;
}
/*
- * copy the reflog message msg to buf, which has been allocated sufficiently
- * large, while cleaning up the whitespaces. Especially, convert LF to space,
- * because reflog file is one line per entry.
+ * Associate a ref store with a name. It is a fatal error to call this
+ * function twice for the same name.
*/
-static int copy_msg(char *buf, const char *msg)
+static void register_ref_store_map(struct hashmap *map,
+ const char *type,
+ struct ref_store *refs,
+ const char *name)
{
- char *cp = buf;
- char c;
- int wasspace = 1;
+ if (!map->tablesize)
+ hashmap_init(map, ref_store_hash_cmp, NULL, 0);
- *cp++ = '\t';
- while ((c = *msg++)) {
- if (wasspace && isspace(c))
- continue;
- wasspace = isspace(c);
- if (wasspace)
- c = ' ';
- *cp++ = c;
- }
- while (buf < cp && isspace(cp[-1]))
- cp--;
- *cp++ = '\n';
- return cp - buf;
+ if (hashmap_put(map, alloc_ref_store_hash_entry(name, refs)))
+ die("BUG: %s ref_store '%s' initialized twice", type, name);
}
-int log_ref_setup(const char *refname, char *logfile, int bufsize)
+struct ref_store *get_submodule_ref_store(const char *submodule)
{
- int logfd, oflags = O_APPEND | O_WRONLY;
+ struct strbuf submodule_sb = STRBUF_INIT;
+ struct ref_store *refs;
+ char *to_free = NULL;
+ size_t len;
- git_snpath(logfile, bufsize, "logs/%s", refname);
- if (log_all_ref_updates &&
- (starts_with(refname, "refs/heads/") ||
- starts_with(refname, "refs/remotes/") ||
- starts_with(refname, "refs/notes/") ||
- !strcmp(refname, "HEAD"))) {
- if (safe_create_leading_directories(logfile) < 0)
- return error("unable to create directory for %s",
- logfile);
- oflags |= O_CREAT;
- }
+ if (!submodule)
+ return NULL;
- logfd = open(logfile, oflags, 0666);
- if (logfd < 0) {
- if (!(oflags & O_CREAT) && errno == ENOENT)
- return 0;
+ len = strlen(submodule);
+ while (len && is_dir_sep(submodule[len - 1]))
+ len--;
+ if (!len)
+ return NULL;
- if ((oflags & O_CREAT) && errno == EISDIR) {
- if (remove_empty_directories(logfile)) {
- return error("There are still logs under '%s'",
- logfile);
- }
- logfd = open(logfile, oflags, 0666);
- }
+ if (submodule[len])
+ /* We need to strip off one or more trailing slashes */
+ submodule = to_free = xmemdupz(submodule, len);
- if (logfd < 0)
- return error("Unable to append to %s: %s",
- logfile, strerror(errno));
- }
+ refs = lookup_ref_store_map(&submodule_ref_stores, submodule);
+ if (refs)
+ goto done;
- adjust_shared_perm(logfile);
- close(logfd);
- return 0;
+ strbuf_addstr(&submodule_sb, submodule);
+ if (!is_nonbare_repository_dir(&submodule_sb))
+ goto done;
+
+ if (submodule_to_gitdir(&submodule_sb, submodule))
+ goto done;
+
+ /* assume that add_submodule_odb() has been called */
+ refs = ref_store_init(submodule_sb.buf,
+ REF_STORE_READ | REF_STORE_ODB);
+ register_ref_store_map(&submodule_ref_stores, "submodule",
+ refs, submodule);
+
+done:
+ strbuf_release(&submodule_sb);
+ free(to_free);
+
+ return refs;
+}
+
+struct ref_store *get_worktree_ref_store(const struct worktree *wt)
+{
+ struct ref_store *refs;
+ const char *id;
+
+ if (wt->is_current)
+ return get_main_ref_store();
+
+ id = wt->id ? wt->id : "/";
+ refs = lookup_ref_store_map(&worktree_ref_stores, id);
+ if (refs)
+ return refs;
+
+ if (wt->id)
+ refs = ref_store_init(git_common_path("worktrees/%s", wt->id),
+ REF_STORE_ALL_CAPS);
+ else
+ refs = ref_store_init(get_git_common_dir(),
+ REF_STORE_ALL_CAPS);
+
+ if (refs)
+ register_ref_store_map(&worktree_ref_stores, "worktree",
+ refs, id);
+ return refs;
+}
+
+void base_ref_store_init(struct ref_store *refs,
+ const struct ref_storage_be *be)
+{
+ refs->be = be;
}
-static int log_ref_write(const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg)
+/* backend functions */
+int refs_pack_refs(struct ref_store *refs, unsigned int flags)
{
- int logfd, result, written, oflags = O_APPEND | O_WRONLY;
- unsigned maxlen, len;
- int msglen;
- char log_file[PATH_MAX];
- char *logrec;
- const char *committer;
+ return refs->be->pack_refs(refs, flags);
+}
+
+int refs_peel_ref(struct ref_store *refs, const char *refname,
+ unsigned char *sha1)
+{
+ int flag;
+ unsigned char base[20];
+
+ if (current_ref_iter && current_ref_iter->refname == refname) {
+ struct object_id peeled;
- if (log_all_ref_updates < 0)
- log_all_ref_updates = !is_bare_repository();
+ if (ref_iterator_peel(current_ref_iter, &peeled))
+ return -1;
+ hashcpy(sha1, peeled.hash);
+ return 0;
+ }
- result = log_ref_setup(refname, log_file, sizeof(log_file));
- if (result)
- return result;
+ if (refs_read_ref_full(refs, refname,
+ RESOLVE_REF_READING, base, &flag))
+ return -1;
- logfd = open(log_file, oflags);
- if (logfd < 0)
- return 0;
- msglen = msg ? strlen(msg) : 0;
- committer = git_committer_info(0);
- maxlen = strlen(committer) + msglen + 100;
- logrec = xmalloc(maxlen);
- len = sprintf(logrec, "%s %s %s\n",
- sha1_to_hex(old_sha1),
- sha1_to_hex(new_sha1),
- committer);
- if (msglen)
- len += copy_msg(logrec + len - 1, msg) - 1;
- written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
- free(logrec);
- if (close(logfd) != 0 || written != len)
- return error("Unable to append to %s", log_file);
- return 0;
+ return peel_object(base, sha1);
}
-static int is_branch(const char *refname)
+int peel_ref(const char *refname, unsigned char *sha1)
{
- return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
+ return refs_peel_ref(get_main_ref_store(), refname, sha1);
}
-int write_ref_sha1(struct ref_lock *lock,
- const unsigned char *sha1, const char *logmsg)
+int refs_create_symref(struct ref_store *refs,
+ const char *ref_target,
+ const char *refs_heads_master,
+ const char *logmsg)
{
- static char term = '\n';
- struct object *o;
-
- if (!lock)
- return -1;
- if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
- unlock_ref(lock);
- return 0;
- }
- o = parse_object(sha1);
- if (!o) {
- error("Trying to write ref %s with nonexistent object %s",
- lock->ref_name, sha1_to_hex(sha1));
- unlock_ref(lock);
- return -1;
- }
- if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
- error("Trying to write non-commit object %s to branch %s",
- sha1_to_hex(sha1), lock->ref_name);
- unlock_ref(lock);
- return -1;
- }
- if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
- write_in_full(lock->lock_fd, &term, 1) != 1
- || close_ref(lock) < 0) {
- error("Couldn't write %s", lock->lk->filename);
- unlock_ref(lock);
- return -1;
- }
- clear_loose_ref_cache(&ref_cache);
- if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
- (strcmp(lock->ref_name, lock->orig_ref_name) &&
- log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
- unlock_ref(lock);
- return -1;
- }
- if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
- /*
- * Special hack: If a branch is updated directly and HEAD
- * points to it (may happen on the remote side of a push
- * for example) then logically the HEAD reflog should be
- * updated too.
- * A generic solution implies reverse symref information,
- * but finding all symrefs pointing to the given branch
- * would be rather costly for this rare event (the direct
- * update of a branch) to be worth it. So let's cheat and
- * check with HEAD only which should cover 99% of all usage
- * scenarios (even 100% of the default ones).
- */
- unsigned char head_sha1[20];
- int head_flag;
- const char *head_ref;
- head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
- if (head_ref && (head_flag & REF_ISSYMREF) &&
- !strcmp(head_ref, lock->ref_name))
- log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
- }
- if (commit_ref(lock)) {
- error("Couldn't set %s", lock->ref_name);
- unlock_ref(lock);
- return -1;
- }
- unlock_ref(lock);
- return 0;
+ return refs->be->create_symref(refs, ref_target,
+ refs_heads_master,
+ logmsg);
}
int create_symref(const char *ref_target, const char *refs_heads_master,
const char *logmsg)
{
- const char *lockpath;
- char ref[1000];
- int fd, len, written;
- char *git_HEAD = git_pathdup("%s", ref_target);
- unsigned char old_sha1[20], new_sha1[20];
+ return refs_create_symref(get_main_ref_store(), ref_target,
+ refs_heads_master, logmsg);
+}
- if (logmsg && read_ref(ref_target, old_sha1))
- hashclr(old_sha1);
+int ref_update_reject_duplicates(struct string_list *refnames,
+ struct strbuf *err)
+{
+ size_t i, n = refnames->nr;
- if (safe_create_leading_directories(git_HEAD) < 0)
- return error("unable to create directory for %s", git_HEAD);
+ assert(err);
-#ifndef NO_SYMLINK_HEAD
- if (prefer_symlink_refs) {
- unlink(git_HEAD);
- if (!symlink(refs_heads_master, git_HEAD))
- goto done;
- fprintf(stderr, "no symlink - falling back to symbolic ref\n");
- }
-#endif
+ for (i = 1; i < n; i++) {
+ int cmp = strcmp(refnames->items[i - 1].string,
+ refnames->items[i].string);
- len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
- if (sizeof(ref) <= len) {
- error("refname too long: %s", refs_heads_master);
- goto error_free_return;
- }
- lockpath = mkpath("%s.lock", git_HEAD);
- fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
- if (fd < 0) {
- error("Unable to open %s for writing", lockpath);
- goto error_free_return;
- }
- written = write_in_full(fd, ref, len);
- if (close(fd) != 0 || written != len) {
- error("Unable to write to %s", lockpath);
- goto error_unlink_return;
+ if (!cmp) {
+ strbuf_addf(err,
+ "multiple updates for ref '%s' not allowed.",
+ refnames->items[i].string);
+ return 1;
+ } else if (cmp > 0) {
+ die("BUG: ref_update_reject_duplicates() received unsorted list");
+ }
}
- if (rename(lockpath, git_HEAD) < 0) {
- error("Unable to create %s", git_HEAD);
- goto error_unlink_return;
+ return 0;
+}
+
+int ref_transaction_prepare(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = transaction->ref_store;
+
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ /* Good. */
+ break;
+ case REF_TRANSACTION_PREPARED:
+ die("BUG: prepare called twice on reference transaction");
+ break;
+ case REF_TRANSACTION_CLOSED:
+ die("BUG: prepare called on a closed reference transaction");
+ break;
+ default:
+ die("BUG: unexpected reference transaction state");
+ break;
}
- if (adjust_shared_perm(git_HEAD)) {
- error("Unable to fix permissions on %s", lockpath);
- error_unlink_return:
- unlink_or_warn(lockpath);
- error_free_return:
- free(git_HEAD);
+
+ if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
+ strbuf_addstr(err,
+ _("ref updates forbidden inside quarantine environment"));
return -1;
}
-#ifndef NO_SYMLINK_HEAD
- done:
-#endif
- if (logmsg && !read_ref(refs_heads_master, new_sha1))
- log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
-
- free(git_HEAD);
- return 0;
+ return refs->be->transaction_prepare(refs, transaction, err);
}
-static char *ref_msg(const char *line, const char *endp)
+int ref_transaction_abort(struct ref_transaction *transaction,
+ struct strbuf *err)
{
- const char *ep;
- line += 82;
- ep = memchr(line, '\n', endp - line);
- if (!ep)
- ep = endp;
- return xmemdupz(line, ep - line);
-}
+ struct ref_store *refs = transaction->ref_store;
+ int ret = 0;
-int read_ref_at(const char *refname, unsigned long at_time, int cnt,
- unsigned char *sha1, char **msg,
- unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
-{
- const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
- char *tz_c;
- int logfd, tz, reccnt = 0;
- struct stat st;
- unsigned long date;
- unsigned char logged_sha1[20];
- void *log_mapped;
- size_t mapsz;
-
- logfile = git_path("logs/%s", refname);
- logfd = open(logfile, O_RDONLY, 0);
- if (logfd < 0)
- die_errno("Unable to read log '%s'", logfile);
- fstat(logfd, &st);
- if (!st.st_size)
- die("Log %s is empty.", logfile);
- mapsz = xsize_t(st.st_size);
- log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
- logdata = log_mapped;
- close(logfd);
-
- lastrec = NULL;
- rec = logend = logdata + st.st_size;
- while (logdata < rec) {
- reccnt++;
- if (logdata < rec && *(rec-1) == '\n')
- rec--;
- lastgt = NULL;
- while (logdata < rec && *(rec-1) != '\n') {
- rec--;
- if (*rec == '>')
- lastgt = rec;
- }
- if (!lastgt)
- die("Log %s is corrupt.", logfile);
- date = strtoul(lastgt + 1, &tz_c, 10);
- if (date <= at_time || cnt == 0) {
- tz = strtoul(tz_c, NULL, 10);
- if (msg)
- *msg = ref_msg(rec, logend);
- if (cutoff_time)
- *cutoff_time = date;
- if (cutoff_tz)
- *cutoff_tz = tz;
- if (cutoff_cnt)
- *cutoff_cnt = reccnt - 1;
- if (lastrec) {
- if (get_sha1_hex(lastrec, logged_sha1))
- die("Log %s is corrupt.", logfile);
- if (get_sha1_hex(rec + 41, sha1))
- die("Log %s is corrupt.", logfile);
- if (hashcmp(logged_sha1, sha1)) {
- warning("Log %s has gap after %s.",
- logfile, show_date(date, tz, DATE_RFC2822));
- }
- }
- else if (date == at_time) {
- if (get_sha1_hex(rec + 41, sha1))
- die("Log %s is corrupt.", logfile);
- }
- else {
- if (get_sha1_hex(rec + 41, logged_sha1))
- die("Log %s is corrupt.", logfile);
- if (hashcmp(logged_sha1, sha1)) {
- warning("Log %s unexpectedly ended on %s.",
- logfile, show_date(date, tz, DATE_RFC2822));
- }
- }
- munmap(log_mapped, mapsz);
- return 0;
- }
- lastrec = rec;
- if (cnt > 0)
- cnt--;
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ /* No need to abort explicitly. */
+ break;
+ case REF_TRANSACTION_PREPARED:
+ ret = refs->be->transaction_abort(refs, transaction, err);
+ break;
+ case REF_TRANSACTION_CLOSED:
+ die("BUG: abort called on a closed reference transaction");
+ break;
+ default:
+ die("BUG: unexpected reference transaction state");
+ break;
}
- rec = logdata;
- while (rec < logend && *rec != '>' && *rec != '\n')
- rec++;
- if (rec == logend || *rec == '\n')
- die("Log %s is corrupt.", logfile);
- date = strtoul(rec + 1, &tz_c, 10);
- tz = strtoul(tz_c, NULL, 10);
- if (get_sha1_hex(logdata, sha1))
- die("Log %s is corrupt.", logfile);
- if (is_null_sha1(sha1)) {
- if (get_sha1_hex(logdata + 41, sha1))
- die("Log %s is corrupt.", logfile);
- }
- if (msg)
- *msg = ref_msg(logdata, logend);
- munmap(log_mapped, mapsz);
-
- if (cutoff_time)
- *cutoff_time = date;
- if (cutoff_tz)
- *cutoff_tz = tz;
- if (cutoff_cnt)
- *cutoff_cnt = reccnt;
- return 1;
+ ref_transaction_free(transaction);
+ return ret;
}
-static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
+int ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
{
- unsigned char osha1[20], nsha1[20];
- char *email_end, *message;
- unsigned long timestamp;
- int tz;
+ struct ref_store *refs = transaction->ref_store;
+ int ret;
- /* old SP new SP name <email> SP time TAB msg LF */
- if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' ||
- get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' ||
- get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' ||
- !(email_end = strchr(sb->buf + 82, '>')) ||
- email_end[1] != ' ' ||
- !(timestamp = strtoul(email_end + 2, &message, 10)) ||
- !message || message[0] != ' ' ||
- (message[1] != '+' && message[1] != '-') ||
- !isdigit(message[2]) || !isdigit(message[3]) ||
- !isdigit(message[4]) || !isdigit(message[5]))
- return 0; /* corrupt? */
- email_end[1] = '\0';
- tz = strtol(message + 1, NULL, 10);
- if (message[6] != '\t')
- message += 6;
- else
- message += 7;
- return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data);
+ switch (transaction->state) {
+ case REF_TRANSACTION_OPEN:
+ /* Need to prepare first. */
+ ret = ref_transaction_prepare(transaction, err);
+ if (ret)
+ return ret;
+ break;
+ case REF_TRANSACTION_PREPARED:
+ /* Fall through to finish. */
+ break;
+ case REF_TRANSACTION_CLOSED:
+ die("BUG: commit called on a closed reference transaction");
+ break;
+ default:
+ die("BUG: unexpected reference transaction state");
+ break;
+ }
+
+ return refs->be->transaction_finish(refs, transaction, err);
}
-static char *find_beginning_of_line(char *bob, char *scan)
+int refs_verify_refname_available(struct ref_store *refs,
+ const char *refname,
+ const struct string_list *extras,
+ const struct string_list *skip,
+ struct strbuf *err)
{
- while (bob < scan && *(--scan) != '\n')
- ; /* keep scanning backwards */
+ const char *slash;
+ const char *extra_refname;
+ struct strbuf dirname = STRBUF_INIT;
+ struct strbuf referent = STRBUF_INIT;
+ struct object_id oid;
+ unsigned int type;
+ struct ref_iterator *iter;
+ int ok;
+ int ret = -1;
+
/*
- * Return either beginning of the buffer, or LF at the end of
- * the previous line.
+ * For the sake of comments in this function, suppose that
+ * refname is "refs/foo/bar".
*/
- return scan;
-}
-int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
-{
- struct strbuf sb = STRBUF_INIT;
- FILE *logfp;
- long pos;
- int ret = 0, at_tail = 1;
+ assert(err);
- logfp = fopen(git_path("logs/%s", refname), "r");
- if (!logfp)
- return -1;
+ strbuf_grow(&dirname, strlen(refname) + 1);
+ for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
+ /* Expand dirname to the new prefix, not including the trailing slash: */
+ strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
- /* Jump to the end */
- if (fseek(logfp, 0, SEEK_END) < 0)
- return error("cannot seek back reflog for %s: %s",
- refname, strerror(errno));
- pos = ftell(logfp);
- while (!ret && 0 < pos) {
- int cnt;
- size_t nread;
- char buf[BUFSIZ];
- char *endp, *scanp;
-
- /* Fill next block from the end */
- cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
- if (fseek(logfp, pos - cnt, SEEK_SET))
- return error("cannot seek back reflog for %s: %s",
- refname, strerror(errno));
- nread = fread(buf, cnt, 1, logfp);
- if (nread != 1)
- return error("cannot read %d bytes from reflog for %s: %s",
- cnt, refname, strerror(errno));
- pos -= cnt;
-
- scanp = endp = buf + cnt;
- if (at_tail && scanp[-1] == '\n')
- /* Looking at the final LF at the end of the file */
- scanp--;
- at_tail = 0;
-
- while (buf < scanp) {
- /*
- * terminating LF of the previous line, or the beginning
- * of the buffer.
- */
- char *bp;
-
- bp = find_beginning_of_line(buf, scanp);
-
- if (*bp != '\n') {
- strbuf_splice(&sb, 0, 0, buf, endp - buf);
- if (pos)
- break; /* need to fill another block */
- scanp = buf - 1; /* leave loop */
- } else {
- /*
- * (bp + 1) thru endp is the beginning of the
- * current line we have in sb
- */
- strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
- scanp = bp;
- endp = bp + 1;
- }
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- strbuf_reset(&sb);
- if (ret)
- break;
+ /*
+ * We are still at a leading dir of the refname (e.g.,
+ * "refs/foo"; if there is a reference with that name,
+ * it is a conflict, *unless* it is in skip.
+ */
+ if (skip && string_list_has_string(skip, dirname.buf))
+ continue;
+
+ if (!refs_read_raw_ref(refs, dirname.buf, oid.hash, &referent, &type)) {
+ strbuf_addf(err, "'%s' exists; cannot create '%s'",
+ dirname.buf, refname);
+ goto cleanup;
}
+ if (extras && string_list_has_string(extras, dirname.buf)) {
+ strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
+ refname, dirname.buf);
+ goto cleanup;
+ }
}
- if (!ret && sb.len)
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- fclose(logfp);
- strbuf_release(&sb);
- return ret;
-}
+ /*
+ * We are at the leaf of our refname (e.g., "refs/foo/bar").
+ * There is no point in searching for a reference with that
+ * name, because a refname isn't considered to conflict with
+ * itself. But we still need to check for references whose
+ * names are in the "refs/foo/bar/" namespace, because they
+ * *do* conflict.
+ */
+ strbuf_addstr(&dirname, refname + dirname.len);
+ strbuf_addch(&dirname, '/');
+
+ iter = refs_ref_iterator_begin(refs, dirname.buf, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN);
+ while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
+ if (skip &&
+ string_list_has_string(skip, iter->refname))
+ continue;
-int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
-{
- FILE *logfp;
- struct strbuf sb = STRBUF_INIT;
- int ret = 0;
+ strbuf_addf(err, "'%s' exists; cannot create '%s'",
+ iter->refname, refname);
+ ref_iterator_abort(iter);
+ goto cleanup;
+ }
- logfp = fopen(git_path("logs/%s", refname), "r");
- if (!logfp)
- return -1;
+ if (ok != ITER_DONE)
+ die("BUG: error while iterating over references");
+
+ extra_refname = find_descendant_ref(dirname.buf, extras, skip);
+ if (extra_refname)
+ strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
+ refname, extra_refname);
+ else
+ ret = 0;
- while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- fclose(logfp);
- strbuf_release(&sb);
+cleanup:
+ strbuf_release(&referent);
+ strbuf_release(&dirname);
return ret;
}
-/*
- * Call fn for each reflog in the namespace indicated by name. name
- * must be empty or end with '/'. Name will be used as a scratch
- * space, but its contents will be restored before return.
- */
-static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data)
-{
- DIR *d = opendir(git_path("logs/%s", name->buf));
- int retval = 0;
- struct dirent *de;
- int oldlen = name->len;
- if (!d)
- return name->len ? errno : 0;
+int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data)
+{
+ struct ref_iterator *iter;
- while ((de = readdir(d)) != NULL) {
- struct stat st;
+ iter = refs->be->reflog_iterator_begin(refs);
- if (de->d_name[0] == '.')
- continue;
- if (has_extension(de->d_name, ".lock"))
- continue;
- strbuf_addstr(name, de->d_name);
- if (stat(git_path("logs/%s", name->buf), &st) < 0) {
- ; /* silently ignore */
- } else {
- if (S_ISDIR(st.st_mode)) {
- strbuf_addch(name, '/');
- retval = do_for_each_reflog(name, fn, cb_data);
- } else {
- unsigned char sha1[20];
- if (read_ref_full(name->buf, sha1, 0, NULL))
- retval = error("bad ref for %s", name->buf);
- else
- retval = fn(name->buf, sha1, 0, cb_data);
- }
- if (retval)
- break;
- }
- strbuf_setlen(name, oldlen);
- }
- closedir(d);
- return retval;
+ return do_for_each_ref_iterator(iter, fn, cb_data);
}
int for_each_reflog(each_ref_fn fn, void *cb_data)
{
- int retval;
- struct strbuf name;
- strbuf_init(&name, PATH_MAX);
- retval = do_for_each_reflog(&name, fn, cb_data);
- strbuf_release(&name);
- return retval;
+ return refs_for_each_reflog(get_main_ref_store(), fn, cb_data);
}
-static struct ref_lock *update_ref_lock(const char *refname,
- const unsigned char *oldval,
- int flags, int *type_p,
- enum action_on_err onerr)
+int refs_for_each_reflog_ent_reverse(struct ref_store *refs,
+ const char *refname,
+ each_reflog_ent_fn fn,
+ void *cb_data)
{
- struct ref_lock *lock;
- lock = lock_any_ref_for_update(refname, oldval, flags, type_p);
- if (!lock) {
- const char *str = "Cannot lock the ref '%s'.";
- switch (onerr) {
- case MSG_ON_ERR: error(str, refname); break;
- case DIE_ON_ERR: die(str, refname); break;
- case QUIET_ON_ERR: break;
- }
- }
- return lock;
+ return refs->be->for_each_reflog_ent_reverse(refs, refname,
+ fn, cb_data);
}
-static int update_ref_write(const char *action, const char *refname,
- const unsigned char *sha1, struct ref_lock *lock,
- enum action_on_err onerr)
+int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn,
+ void *cb_data)
{
- if (write_ref_sha1(lock, sha1, action) < 0) {
- const char *str = "Cannot update the ref '%s'.";
- switch (onerr) {
- case MSG_ON_ERR: error(str, refname); break;
- case DIE_ON_ERR: die(str, refname); break;
- case QUIET_ON_ERR: break;
- }
- return 1;
- }
- return 0;
+ return refs_for_each_reflog_ent_reverse(get_main_ref_store(),
+ refname, fn, cb_data);
}
-int update_ref(const char *action, const char *refname,
- const unsigned char *sha1, const unsigned char *oldval,
- int flags, enum action_on_err onerr)
+int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname,
+ each_reflog_ent_fn fn, void *cb_data)
{
- struct ref_lock *lock;
- lock = update_ref_lock(refname, oldval, flags, NULL, onerr);
- if (!lock)
- return 1;
- return update_ref_write(action, refname, sha1, lock, onerr);
+ return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data);
}
-static int ref_update_compare(const void *r1, const void *r2)
+int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn,
+ void *cb_data)
{
- const struct ref_update * const *u1 = r1;
- const struct ref_update * const *u2 = r2;
- return strcmp((*u1)->ref_name, (*u2)->ref_name);
+ return refs_for_each_reflog_ent(get_main_ref_store(), refname,
+ fn, cb_data);
}
-static int ref_update_reject_duplicates(struct ref_update **updates, int n,
- enum action_on_err onerr)
+int refs_reflog_exists(struct ref_store *refs, const char *refname)
{
- int i;
- for (i = 1; i < n; i++)
- if (!strcmp(updates[i - 1]->ref_name, updates[i]->ref_name)) {
- const char *str =
- "Multiple updates for ref '%s' not allowed.";
- switch (onerr) {
- case MSG_ON_ERR:
- error(str, updates[i]->ref_name); break;
- case DIE_ON_ERR:
- die(str, updates[i]->ref_name); break;
- case QUIET_ON_ERR:
- break;
- }
- return 1;
- }
- return 0;
+ return refs->be->reflog_exists(refs, refname);
}
-int update_refs(const char *action, const struct ref_update **updates_orig,
- int n, enum action_on_err onerr)
+int reflog_exists(const char *refname)
{
- int ret = 0, delnum = 0, i;
- struct ref_update **updates;
- int *types;
- struct ref_lock **locks;
- const char **delnames;
-
- if (!updates_orig || !n)
- return 0;
-
- /* Allocate work space */
- updates = xmalloc(sizeof(*updates) * n);
- types = xmalloc(sizeof(*types) * n);
- locks = xcalloc(n, sizeof(*locks));
- delnames = xmalloc(sizeof(*delnames) * n);
-
- /* Copy, sort, and reject duplicate refs */
- memcpy(updates, updates_orig, sizeof(*updates) * n);
- qsort(updates, n, sizeof(*updates), ref_update_compare);
- ret = ref_update_reject_duplicates(updates, n, onerr);
- if (ret)
- goto cleanup;
-
- /* Acquire all locks while verifying old values */
- for (i = 0; i < n; i++) {
- locks[i] = update_ref_lock(updates[i]->ref_name,
- (updates[i]->have_old ?
- updates[i]->old_sha1 : NULL),
- updates[i]->flags,
- &types[i], onerr);
- if (!locks[i]) {
- ret = 1;
- goto cleanup;
- }
- }
-
- /* Perform updates first so live commits remain referenced */
- for (i = 0; i < n; i++)
- if (!is_null_sha1(updates[i]->new_sha1)) {
- ret = update_ref_write(action,
- updates[i]->ref_name,
- updates[i]->new_sha1,
- locks[i], onerr);
- locks[i] = NULL; /* freed by update_ref_write */
- if (ret)
- goto cleanup;
- }
-
- /* Perform deletes now that updates are safely completed */
- for (i = 0; i < n; i++)
- if (locks[i]) {
- delnames[delnum++] = locks[i]->ref_name;
- ret |= delete_ref_loose(locks[i], types[i]);
- }
- ret |= repack_without_refs(delnames, delnum);
- for (i = 0; i < delnum; i++)
- unlink_or_warn(git_path("logs/%s", delnames[i]));
- clear_loose_ref_cache(&ref_cache);
-
-cleanup:
- for (i = 0; i < n; i++)
- if (locks[i])
- unlock_ref(locks[i]);
- free(updates);
- free(types);
- free(locks);
- free(delnames);
- return ret;
+ return refs_reflog_exists(get_main_ref_store(), refname);
}
-char *shorten_unambiguous_ref(const char *refname, int strict)
+int refs_create_reflog(struct ref_store *refs, const char *refname,
+ int force_create, struct strbuf *err)
{
- int i;
- static char **scanf_fmts;
- static int nr_rules;
- char *short_name;
-
- if (!nr_rules) {
- /*
- * Pre-generate scanf formats from ref_rev_parse_rules[].
- * Generate a format suitable for scanf from a
- * ref_rev_parse_rules rule by interpolating "%s" at the
- * location of the "%.*s".
- */
- size_t total_len = 0;
- size_t offset = 0;
-
- /* the rule list is NULL terminated, count them first */
- for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++)
- /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */
- total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1;
-
- scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
-
- offset = 0;
- for (i = 0; i < nr_rules; i++) {
- assert(offset < total_len);
- scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
- offset += snprintf(scanf_fmts[i], total_len - offset,
- ref_rev_parse_rules[i], 2, "%s") + 1;
- }
- }
-
- /* bail out if there are no rules */
- if (!nr_rules)
- return xstrdup(refname);
-
- /* buffer for scanf result, at most refname must fit */
- short_name = xstrdup(refname);
-
- /* skip first rule, it will always match */
- for (i = nr_rules - 1; i > 0 ; --i) {
- int j;
- int rules_to_fail = i;
- int short_name_len;
+ return refs->be->create_reflog(refs, refname, force_create, err);
+}
- if (1 != sscanf(refname, scanf_fmts[i], short_name))
- continue;
+int safe_create_reflog(const char *refname, int force_create,
+ struct strbuf *err)
+{
+ return refs_create_reflog(get_main_ref_store(), refname,
+ force_create, err);
+}
- short_name_len = strlen(short_name);
+int refs_delete_reflog(struct ref_store *refs, const char *refname)
+{
+ return refs->be->delete_reflog(refs, refname);
+}
- /*
- * in strict mode, all (except the matched one) rules
- * must fail to resolve to a valid non-ambiguous ref
- */
- if (strict)
- rules_to_fail = nr_rules;
+int delete_reflog(const char *refname)
+{
+ return refs_delete_reflog(get_main_ref_store(), refname);
+}
- /*
- * check if the short name resolves to a valid ref,
- * but use only rules prior to the matched one
- */
- for (j = 0; j < rules_to_fail; j++) {
- const char *rule = ref_rev_parse_rules[j];
- char refname[PATH_MAX];
+int refs_reflog_expire(struct ref_store *refs,
+ const char *refname, const unsigned char *sha1,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ return refs->be->reflog_expire(refs, refname, sha1, flags,
+ prepare_fn, should_prune_fn,
+ cleanup_fn, policy_cb_data);
+}
- /* skip matched rule */
- if (i == j)
- continue;
+int reflog_expire(const char *refname, const unsigned char *sha1,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ return refs_reflog_expire(get_main_ref_store(),
+ refname, sha1, flags,
+ prepare_fn, should_prune_fn,
+ cleanup_fn, policy_cb_data);
+}
- /*
- * the short name is ambiguous, if it resolves
- * (with this previous rule) to a valid ref
- * read_ref() returns 0 on success
- */
- mksnpath(refname, sizeof(refname),
- rule, short_name_len, short_name);
- if (ref_exists(refname))
- break;
- }
+int initial_ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = transaction->ref_store;
- /*
- * short name is non-ambiguous if all previous rules
- * haven't resolved to a valid ref
- */
- if (j == rules_to_fail)
- return short_name;
- }
+ return refs->be->initial_transaction_commit(refs, transaction, err);
+}
- free(short_name);
- return xstrdup(refname);
+int refs_delete_refs(struct ref_store *refs, const char *msg,
+ struct string_list *refnames, unsigned int flags)
+{
+ return refs->be->delete_refs(refs, msg, refnames, flags);
}
-static struct string_list *hide_refs;
+int delete_refs(const char *msg, struct string_list *refnames,
+ unsigned int flags)
+{
+ return refs_delete_refs(get_main_ref_store(), msg, refnames, flags);
+}
-int parse_hide_refs_config(const char *var, const char *value, const char *section)
+int refs_rename_ref(struct ref_store *refs, const char *oldref,
+ const char *newref, const char *logmsg)
{
- if (!strcmp("transfer.hiderefs", var) ||
- /* NEEDSWORK: use parse_config_key() once both are merged */
- (starts_with(var, section) && var[strlen(section)] == '.' &&
- !strcmp(var + strlen(section), ".hiderefs"))) {
- char *ref;
- int len;
+ return refs->be->rename_ref(refs, oldref, newref, logmsg);
+}
- if (!value)
- return config_error_nonbool(var);
- ref = xstrdup(value);
- len = strlen(ref);
- while (len && ref[len - 1] == '/')
- ref[--len] = '\0';
- if (!hide_refs) {
- hide_refs = xcalloc(1, sizeof(*hide_refs));
- hide_refs->strdup_strings = 1;
- }
- string_list_append(hide_refs, ref);
- }
- return 0;
+int rename_ref(const char *oldref, const char *newref, const char *logmsg)
+{
+ return refs_rename_ref(get_main_ref_store(), oldref, newref, logmsg);
}
-int ref_is_hidden(const char *refname)
+int refs_copy_existing_ref(struct ref_store *refs, const char *oldref,
+ const char *newref, const char *logmsg)
{
- struct string_list_item *item;
+ return refs->be->copy_ref(refs, oldref, newref, logmsg);
+}
- if (!hide_refs)
- return 0;
- for_each_string_list_item(item, hide_refs) {
- int len;
- if (!starts_with(refname, item->string))
- continue;
- len = strlen(item->string);
- if (!refname[len] || refname[len] == '/')
- return 1;
- }
- return 0;
+int copy_existing_ref(const char *oldref, const char *newref, const char *logmsg)
+{
+ return refs_copy_existing_ref(get_main_ref_store(), oldref, newref, logmsg);
}
projects / platform / upstream / git.git / blobdiff