+/*
+ * The backend-independent part of the reference module.
+ */
+
#include "cache.h"
#include "lockfile.h"
#include "refs.h"
+#include "refs/refs-internal.h"
#include "object.h"
#include "tag.h"
-#include "dir.h"
-#include "string-list.h"
+
+/*
+ * List of all available backends
+ */
+static struct ref_storage_be *refs_backends = &refs_be_files;
+
+static struct ref_storage_be *find_ref_storage_backend(const char *name)
+{
+ 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;
+}
/*
* How to handle various characters in refnames:
* 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, "~", "^", ":" or SP
+ * 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, 4, 0, 0, 0, 2, 1,
+ 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,
};
/*
- * Used as a flag to ref_transaction_delete when a loose ref is being
- * pruned.
- */
-#define REF_ISPRUNING 0x0100
-/*
* 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
*
* - 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)
+ * - 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';
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;
}
last = ch;
}
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;
-};
-
-/*
- * Bit values for ref_entry::flag. REF_ISSYMREF=0x01,
- * REF_ISPACKED=0x02, REF_ISBROKEN=0x04 and REF_BAD_NAME=0x08 are
- * public values; see refs.h.
- */
-
-/*
- * 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 0x10
-
-/* ref_entry represents a directory of references */
-#define REF_DIR 0x20
-
-/*
- * Entry has not yet been read from disk (used only for REF_DIR
- * entries representing loose references)
- */
-#define REF_INCOMPLETE 0x40
-
-/*
- * 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.
- */
-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 refname_is_safe(const char *refname)
{
- 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;
- }
- return dir;
-}
+ const char *rest;
-/*
- * Check if a refname is safe.
- * For refs that start with "refs/" we consider it safe as long they do
- * not try to resolve to outside of refs/.
- *
- * For all other refs we only consider them safe iff they only contain
- * upper case characters and '_' (like "HEAD" AND "MERGE_HEAD", and not like
- * "config").
- */
-static int refname_is_safe(const char *refname)
-{
- if (starts_with(refname, "refs/")) {
+ if (skip_prefix(refname, "refs/", &rest)) {
char *buf;
int result;
+ size_t restlen = strlen(rest);
+
+ /* rest must not be empty, or start or end with "/" */
+ if (!restlen || *rest == '/' || rest[restlen - 1] == '/')
+ return 0;
- buf = xmalloc(strlen(refname) + 1);
/*
* Does the refname try to escape refs/?
* For example: refs/foo/../bar is safe but refs/foo/../../bar
* is not.
*/
- result = !normalize_path_copy(buf, refname + strlen("refs/"));
+ buf = xmallocz(restlen);
+ result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest);
free(buf);
return result;
}
- while (*refname) {
+
+ do {
if (!isupper(*refname) && *refname != '_')
return 0;
refname++;
- }
+ } while (*refname);
return 1;
}
-static struct ref_entry *create_ref_entry(const char *refname,
- const unsigned char *sha1, int flag,
- int check_name)
+char *resolve_refdup(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- int len;
- struct ref_entry *ref;
-
- if (check_name &&
- check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
- die("Reference has invalid format: '%s'", refname);
- if (!check_name && !refname_is_safe(refname))
- die("Reference has invalid name: '%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;
+ return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags,
+ sha1, flags));
}
-static void clear_ref_dir(struct ref_dir *dir);
+/* The argument to filter_refs */
+struct ref_filter {
+ const char *pattern;
+ each_ref_fn *fn;
+ void *cb_data;
+};
-static void free_ref_entry(struct ref_entry *entry)
+int read_ref_full(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);
+ if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags))
+ return 0;
+ return -1;
}
-/*
- * 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)
+int read_ref(const char *refname, unsigned char *sha1)
{
- 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;
+ return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
}
-/*
- * Clear and free all entries in dir, recursively.
- */
-static void clear_ref_dir(struct ref_dir *dir)
+int ref_exists(const char *refname)
{
- 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;
+ unsigned char sha1[20];
+ return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL);
}
-/*
- * 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)
+static int filter_refs(const char *refname, const struct object_id *oid,
+ int flags, void *data)
{
- 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;
+ struct ref_filter *filter = (struct ref_filter *)data;
+
+ if (wildmatch(filter->pattern, refname, 0, NULL))
+ return 0;
+ return filter->fn(refname, oid, flags, filter->cb_data);
}
-static int ref_entry_cmp(const void *a, const void *b)
+enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
{
- struct ref_entry *one = *(struct ref_entry **)a;
- struct ref_entry *two = *(struct ref_entry **)b;
- return strcmp(one->name, two->name);
-}
+ 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;
+ }
-static void sort_ref_dir(struct ref_dir *dir);
+ if (o->type != OBJ_TAG)
+ return PEEL_NON_TAG;
-struct string_slice {
- size_t len;
- const char *str;
-};
+ o = deref_tag_noverify(o);
+ if (!o)
+ return PEEL_INVALID;
-static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
-{
- 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];
+ hashcpy(sha1, o->oid.hash);
+ return PEEL_PEELED;
}
-/*
- * 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)
-{
- struct ref_entry **r;
- struct string_slice key;
+struct warn_if_dangling_data {
+ FILE *fp;
+ const char *refname;
+ const struct string_list *refnames;
+ const char *msg_fmt;
+};
- if (refname == NULL || !dir->nr)
- return -1;
+static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
+ int flags, void *cb_data)
+{
+ struct warn_if_dangling_data *d = cb_data;
+ const char *resolves_to;
+ struct object_id junk;
- 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 (!(flags & REF_ISSYMREF))
+ return 0;
- if (r == NULL)
- return -1;
+ resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL);
+ if (!resolves_to
+ || (d->refname
+ ? strcmp(resolves_to, d->refname)
+ : !string_list_has_string(d->refnames, resolves_to))) {
+ return 0;
+ }
- return r - dir->entries;
+ fprintf(d->fp, d->msg_fmt, refname);
+ fputc('\n', d->fp);
+ return 0;
}
-/*
- * 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);
+void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
+{
+ 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);
}
-/*
- * 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)
-{
- 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;
- }
+void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
+{
+ struct warn_if_dangling_data data;
- return dir;
+ data.fp = fp;
+ data.refname = NULL;
+ data.refnames = refnames;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
}
-/*
- * 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)
+int for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
- 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;
+ return for_each_ref_in("refs/tags/", fn, cb_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)
+int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
- 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];
-
- 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;
+ return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_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 for_each_branch_ref(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 for_each_ref_in("refs/heads/", 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_branch_ref_submodule(const char *submodule, 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 for_each_ref_in_submodule(submodule, "refs/heads/", 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 for_each_remote_ref(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 for_each_ref_in("refs/remotes/", 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_remote_ref_submodule(const char *submodule, 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 for_each_ref_in_submodule(submodule, "refs/remotes/", 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 head_ref_namespaced(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;
+ struct strbuf buf = STRBUF_INIT;
+ int ret = 0;
+ struct object_id oid;
+ int flag;
- if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
- !ref_resolves_to_object(entry))
- return 0;
+ 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);
- /* 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 ret;
}
-/*
- * 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_glob_ref_in(each_ref_fn fn, const char *pattern,
+ const char *prefix, 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;
+ 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);
+
+ 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;
+
+ 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;
}
-/*
- * 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 for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
{
- int retval;
- int i1 = 0, i2 = 0;
+ return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
+}
- 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);
- }
+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);
+}
+
+static const char *ref_rev_parse_rules[] = {
+ "%.*s",
+ "refs/%.*s",
+ "refs/tags/%.*s",
+ "refs/heads/%.*s",
+ "refs/remotes/%.*s",
+ "refs/remotes/%.*s/HEAD",
+ NULL
+};
+
+int refname_match(const char *abbrev_name, const char *full_name)
+{
+ const char **p;
+ const int abbrev_name_len = strlen(abbrev_name);
+
+ for (p = ref_rev_parse_rules; *p; p++) {
+ if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
+ return 1;
}
- if (retval)
- return retval;
}
+
+ return 0;
}
/*
- * 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.
+ * *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 void prime_ref_dir(struct ref_dir *dir)
+static char *substitute_branch_name(const char **string, int *len)
{
- 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));
+ struct strbuf buf = STRBUF_INIT;
+ int ret = interpret_branch_name(*string, *len, &buf, 0);
+
+ if (ret == *len) {
+ size_t size;
+ *string = strbuf_detach(&buf, &size);
+ *len = size;
+ return (char *)*string;
}
+
+ return NULL;
}
-static int entry_matches(struct ref_entry *entry, const struct string_list *list)
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
{
- return list && string_list_has_string(list, entry->name);
+ char *last_branch = substitute_branch_name(&str, &len);
+ int refs_found = expand_ref(str, len, sha1, ref);
+ free(last_branch);
+ return refs_found;
}
-struct nonmatching_ref_data {
- const struct string_list *skip;
- struct ref_entry *found;
-};
+int expand_ref(const char *str, int len, unsigned char *sha1, char **ref)
+{
+ const char **p, *r;
+ int refs_found = 0;
+
+ *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;
+
+ this_result = refs_found ? sha1_from_ref : sha1;
+ mksnpath(fullref, sizeof(fullref), *p, len, str);
+ r = resolve_ref_unsafe(fullref, 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, "HEAD")) {
+ warning("ignoring dangling symref %s.", fullref);
+ } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
+ warning("ignoring broken ref %s.", fullref);
+ }
+ }
+ return refs_found;
+}
-static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata)
+int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
{
- struct nonmatching_ref_data *data = vdata;
+ char *last_branch = substitute_branch_name(&str, &len);
+ const char **p;
+ int logs_found = 0;
- if (entry_matches(entry, data->skip))
- return 0;
+ *log = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ unsigned char hash[20];
+ char path[PATH_MAX];
+ const char *ref, *it;
- data->found = entry;
- return 1;
+ mksnpath(path, sizeof(path), *p, len, str);
+ ref = resolve_ref_unsafe(path, RESOLVE_REF_READING,
+ hash, NULL);
+ if (!ref)
+ continue;
+ if (reflog_exists(path))
+ it = path;
+ else if (strcmp(ref, path) && reflog_exists(ref))
+ it = ref;
+ else
+ continue;
+ if (!logs_found++) {
+ *log = xstrdup(it);
+ hashcpy(sha1, hash);
+ }
+ if (!warn_ambiguous_refs)
+ break;
+ }
+ free(last_branch);
+ return logs_found;
}
-static void report_refname_conflict(struct ref_entry *entry,
- const char *refname)
+static int is_per_worktree_ref(const char *refname)
{
- error("'%s' exists; cannot create '%s'", entry->name, refname);
+ return !strcmp(refname, "HEAD") ||
+ starts_with(refname, "refs/bisect/");
}
-/*
- * Return true iff a reference named refname could be created without
- * conflicting with the name of an existing reference in dir. If
- * skip is non-NULL, ignore potential conflicts with refs in skip
- * (e.g., because they are scheduled for deletion in the same
- * operation).
- *
- * 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".
- *
- * skip must be sorted.
- */
-static int is_refname_available(const char *refname,
- const struct string_list *skip,
- struct ref_dir *dir)
+static int is_pseudoref_syntax(const char *refname)
{
- const char *slash;
- size_t len;
- int pos;
- char *dirname;
+ const char *c;
- for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
- /*
- * We are still at a leading dir of the refname; we are
- * looking for a conflict with a leaf entry.
- *
- * If we find one, we still must make sure it is
- * not in "skip".
- */
- pos = search_ref_dir(dir, refname, slash - refname);
- if (pos >= 0) {
- struct ref_entry *entry = dir->entries[pos];
- if (entry_matches(entry, skip))
- return 1;
- report_refname_conflict(entry, refname);
+ for (c = refname; *c; c++) {
+ if (!isupper(*c) && *c != '-' && *c != '_')
return 0;
- }
+ }
+
+ return 1;
+}
+enum ref_type ref_type(const char *refname)
+{
+ if (is_per_worktree_ref(refname))
+ return REF_TYPE_PER_WORKTREE;
+ if (is_pseudoref_syntax(refname))
+ return REF_TYPE_PSEUDOREF;
+ return REF_TYPE_NORMAL;
+}
- /*
- * Otherwise, we can try to continue our search with
- * the next component; if we come up empty, we know
- * there is nothing under this whole prefix.
- */
- pos = search_ref_dir(dir, refname, slash + 1 - refname);
- if (pos < 0)
- return 1;
+static int write_pseudoref(const char *pseudoref, const unsigned char *sha1,
+ const unsigned char *old_sha1, struct strbuf *err)
+{
+ const char *filename;
+ int fd;
+ static struct lock_file lock;
+ struct strbuf buf = STRBUF_INIT;
+ int ret = -1;
- dir = get_ref_dir(dir->entries[pos]);
- }
+ strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1));
- /*
- * We are at the leaf of our refname; we want to
- * make sure there are no directories which match it.
- */
- len = strlen(refname);
- dirname = xmallocz(len + 1);
- sprintf(dirname, "%s/", refname);
- pos = search_ref_dir(dir, dirname, len + 1);
- free(dirname);
+ filename = git_path("%s", pseudoref);
+ fd = hold_lock_file_for_update(&lock, filename, LOCK_DIE_ON_ERROR);
+ if (fd < 0) {
+ strbuf_addf(err, "could not open '%s' for writing: %s",
+ filename, strerror(errno));
+ return -1;
+ }
- if (pos >= 0) {
- /*
- * We found a directory named "refname". It is a
- * problem iff it contains any ref that is not
- * in "skip".
- */
- struct ref_entry *entry = dir->entries[pos];
- struct ref_dir *dir = get_ref_dir(entry);
- struct nonmatching_ref_data data;
+ if (old_sha1) {
+ unsigned char actual_old_sha1[20];
- data.skip = skip;
- sort_ref_dir(dir);
- if (!do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data))
- return 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;
+ }
+ }
- report_refname_conflict(data.found, refname);
- return 0;
+ if (write_in_full(fd, buf.buf, buf.len) != buf.len) {
+ strbuf_addf(err, "could not write to '%s'", filename);
+ rollback_lock_file(&lock);
+ goto done;
}
- /*
- * There is no point in searching for another leaf
- * node which matches it; such an entry would be the
- * ref we are looking for, not a conflict.
- */
- return 1;
+ commit_lock_file(&lock);
+ ret = 0;
+done:
+ strbuf_release(&buf);
+ 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;
-
- /*
- * 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;
+static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1)
+{
+ static struct lock_file lock;
+ const char *filename;
- /* The metadata from when this packed-refs cache was read */
- struct stat_validity validity;
-};
+ filename = git_path("%s", pseudoref);
-/*
- * 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;
+ if (old_sha1 && !is_null_sha1(old_sha1)) {
+ int fd;
+ unsigned char actual_old_sha1[20];
+
+ fd = hold_lock_file_for_update(&lock, filename,
+ LOCK_DIE_ON_ERROR);
+ 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;
+ }
-/* Lock used for the main packed-refs file: */
-static struct lock_file packlock;
+ unlink(filename);
+ rollback_lock_file(&lock);
+ } else {
+ unlink(filename);
+ }
-/*
- * 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.
- */
-static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
+int delete_ref(const char *refname, const unsigned char *old_sha1,
+ unsigned int flags)
{
- if (!--packed_refs->referrers) {
- free_ref_entry(packed_refs->root);
- stat_validity_clear(&packed_refs->validity);
- free(packed_refs);
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
+
+ if (ref_type(refname) == REF_TYPE_PSEUDOREF)
+ return delete_pseudoref(refname, old_sha1);
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_delete(transaction, refname, old_sha1,
+ flags, NULL, &err) ||
+ ref_transaction_commit(transaction, &err)) {
+ error("%s", err.buf);
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
return 1;
- } else {
- return 0;
}
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 0;
}
-static void clear_packed_ref_cache(struct ref_cache *refs)
+int copy_reflog_msg(char *buf, const char *msg)
{
- if (refs->packed) {
- struct packed_ref_cache *packed_refs = refs->packed;
+ char *cp = buf;
+ char c;
+ int wasspace = 1;
- if (packed_refs->lock)
- die("internal error: packed-ref cache cleared while locked");
- refs->packed = NULL;
- release_packed_ref_cache(packed_refs);
+ *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;
}
-static void clear_loose_ref_cache(struct ref_cache *refs)
+int should_autocreate_reflog(const char *refname)
{
- if (refs->loose) {
- free_ref_entry(refs->loose);
- refs->loose = NULL;
+ 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;
}
}
-static struct ref_cache *create_ref_cache(const char *submodule)
+int is_branch(const char *refname)
{
- 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;
+ return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
}
-/*
- * 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)
-{
- struct ref_cache *refs;
+struct read_ref_at_cb {
+ const char *refname;
+ unsigned long at_time;
+ int cnt;
+ int reccnt;
+ unsigned char *sha1;
+ int found_it;
- if (!submodule || !*submodule)
- return &ref_cache;
-
- for (refs = submodule_ref_caches; refs; refs = refs->next)
- if (!strcmp(submodule, refs->name))
- return refs;
-
- refs = create_ref_cache(submodule);
- refs->next = submodule_ref_caches;
- submodule_ref_caches = refs;
- return refs;
-}
-
-/* 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(struct strbuf *line, unsigned char *sha1)
-{
- const char *ref;
-
- /*
- * 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)
- */
- if (line->len <= 42)
- return NULL;
-
- if (get_sha1_hex(line->buf, sha1) < 0)
- return NULL;
- if (!isspace(line->buf[40]))
- return NULL;
-
- ref = line->buf + 41;
- if (isspace(*ref))
- return NULL;
-
- if (line->buf[line->len - 1] != '\n')
- return NULL;
- line->buf[--line->len] = 0;
-
- return ref;
-}
-
-/*
- * 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;
- struct strbuf line = STRBUF_INIT;
- enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
-
- while (strbuf_getwholeline(&line, f, '\n') != EOF) {
- unsigned char sha1[20];
- const char *refname;
- const char *traits;
-
- if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
- if (strstr(traits, " fully-peeled "))
- peeled = PEELED_FULLY;
- else if (strstr(traits, " peeled "))
- peeled = PEELED_TAGS;
- /* perhaps other traits later as well */
- continue;
- }
-
- refname = parse_ref_line(&line, sha1);
- if (refname) {
- int flag = REF_ISPACKED;
-
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- hashclr(sha1);
- flag |= REF_BAD_NAME | REF_ISBROKEN;
- }
- last = create_ref_entry(refname, sha1, flag, 0);
- if (peeled == PEELED_FULLY ||
- (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
- last->flag |= REF_KNOWS_PEELED;
- add_ref(dir, last);
- continue;
- }
- if (last &&
- line.buf[0] == '^' &&
- line.len == PEELED_LINE_LENGTH &&
- line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
- !get_sha1_hex(line.buf + 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;
- }
- }
-
- strbuf_release(&line);
-}
-
-/*
- * 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)
-{
- 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;
-}
-
-static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
-{
- return get_ref_dir(packed_ref_cache->root);
-}
-
-static struct ref_dir *get_packed_refs(struct ref_cache *refs)
-{
- return get_packed_ref_dir(get_packed_ref_cache(refs));
-}
-
-void add_packed_ref(const char *refname, const unsigned char *sha1)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
-
- 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));
-}
-
-/*
- * 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)
-{
- 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);
-
- d = opendir(path);
- if (!d)
- return;
-
- strbuf_init(&refname, dirnamelen + 257);
- strbuf_add(&refname, dirname, dirnamelen);
-
- while ((de = readdir(d)) != NULL) {
- unsigned char sha1[20];
- struct stat st;
- int flag;
- const char *refdir;
-
- if (de->d_name[0] == '.')
- continue;
- if (ends_with(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,
- RESOLVE_REF_READING,
- sha1, &flag)) {
- hashclr(sha1);
- flag |= REF_ISBROKEN;
- }
- if (check_refname_format(refname.buf,
- REFNAME_ALLOW_ONELEVEL)) {
- hashclr(sha1);
- flag |= REF_BAD_NAME | REF_ISBROKEN;
- }
- add_entry_to_dir(dir,
- create_ref_entry(refname.buf, sha1, flag, 0));
- }
- 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));
- }
- 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;
-}
-
-static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
- const char *refname, unsigned char *sha1,
- int recursion)
-{
- int fd, len;
- char buffer[128], *p;
- char *path;
-
- 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;
-
- /* Was it a detached head or an old-fashioned symlink? */
- if (!get_sha1_hex(buffer, sha1))
- return 0;
-
- /* Symref? */
- if (strncmp(buffer, "ref:", 4))
- return -1;
- p = buffer + 4;
- while (isspace(*p))
- p++;
-
- return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
-}
-
-int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
-{
- int len = strlen(path), retval;
- char *submodule;
- struct ref_cache *refs;
-
- while (len && path[len-1] == '/')
- len--;
- if (!len)
- return -1;
- submodule = xstrndup(path, len);
- refs = get_ref_cache(submodule);
- free(submodule);
-
- retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
- return retval;
-}
-
-/*
- * 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)
-{
- return find_ref(get_packed_refs(&ref_cache), refname);
-}
-
-/*
- * A loose ref file doesn't exist; check for a packed ref. The
- * options are forwarded from resolve_safe_unsafe().
- */
-static int resolve_missing_loose_ref(const char *refname,
- int resolve_flags,
- unsigned char *sha1,
- int *flags)
-{
- 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 (flags)
- *flags |= REF_ISPACKED;
- return 0;
- }
- /* The reference is not a packed reference, either. */
- if (resolve_flags & RESOLVE_REF_READING) {
- errno = ENOENT;
- return -1;
- } else {
- hashclr(sha1);
- return 0;
- }
-}
-
-/* This function needs to return a meaningful errno on failure */
-const char *resolve_ref_unsafe(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
-{
- int depth = MAXDEPTH;
- ssize_t len;
- char buffer[256];
- static char refname_buffer[256];
- int bad_name = 0;
-
- if (flags)
- *flags = 0;
-
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_BAD_NAME;
-
- if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
- !refname_is_safe(refname)) {
- errno = EINVAL;
- return NULL;
- }
- /*
- * 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.
- */
- bad_name = 1;
- }
- for (;;) {
- char path[PATH_MAX];
- struct stat st;
- char *buf;
- int fd;
-
- if (--depth < 0) {
- errno = ELOOP;
- 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 NULL;
- if (resolve_missing_loose_ref(refname, resolve_flags,
- sha1, flags))
- return NULL;
- if (bad_name) {
- hashclr(sha1);
- if (flags)
- *flags |= REF_ISBROKEN;
- }
- return refname;
- }
-
- /* 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 (flags)
- *flags |= REF_ISSYMREF;
- if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
- hashclr(sha1);
- return refname;
- }
- 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);
- if (len < 0) {
- int save_errno = errno;
- close(fd);
- errno = save_errno;
- return NULL;
- }
- close(fd);
- while (len && isspace(buffer[len-1]))
- len--;
- buffer[len] = '\0';
-
- /*
- * 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 (flags)
- *flags |= REF_ISBROKEN;
- errno = EINVAL;
- return NULL;
- }
- if (bad_name) {
- hashclr(sha1);
- if (flags)
- *flags |= REF_ISBROKEN;
- }
- return refname;
- }
- if (flags)
- *flags |= REF_ISSYMREF;
- buf = buffer + 4;
- while (isspace(*buf))
- buf++;
- refname = strcpy(refname_buffer, buf);
- if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
- hashclr(sha1);
- return refname;
- }
- if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
- if (flags)
- *flags |= REF_ISBROKEN;
-
- if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
- !refname_is_safe(buf)) {
- errno = EINVAL;
- return NULL;
- }
- bad_name = 1;
- }
- }
-}
-
-char *resolve_refdup(const char *ref, int resolve_flags, unsigned char *sha1, int *flags)
-{
- const char *ret = resolve_ref_unsafe(ref, resolve_flags, sha1, flags);
- 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, int resolve_flags, unsigned char *sha1, int *flags)
-{
- if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags))
- return 0;
- return -1;
-}
-
-int read_ref(const char *refname, unsigned char *sha1)
-{
- return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
-}
-
-int ref_exists(const char *refname)
-{
- unsigned char sha1[20];
- return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL);
-}
-
-static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
- void *data)
-{
- 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);
-}
-
-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
-};
-
-/*
- * 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;
- }
- }
- if (entry->flag & REF_ISBROKEN)
- return PEEL_BROKEN;
- if (entry->flag & REF_ISSYMREF)
- return PEEL_IS_SYMREF;
-
- 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;
-}
-
-int peel_ref(const char *refname, unsigned char *sha1)
-{
- int flag;
- unsigned char base[20];
-
- 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;
- }
-
- if (read_ref_full(refname, RESOLVE_REF_READING, base, &flag))
- return -1;
-
- /*
- * 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;
- }
- }
-
- 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))
- return 0;
-
- resolves_to = resolve_ref_unsafe(refname, 0, junk, NULL);
- if (!resolves_to
- || (d->refname
- ? strcmp(resolves_to, d->refname)
- : !string_list_has_string(d->refnames, resolves_to))) {
- return 0;
- }
-
- fprintf(d->fp, d->msg_fmt, refname);
- fputc('\n', d->fp);
- return 0;
-}
-
-void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
-{
- 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);
-}
-
-void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
-{
- 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);
-}
-
-/*
- * 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)
-{
- struct packed_ref_cache *packed_ref_cache;
- struct ref_dir *loose_dir;
- struct ref_dir *packed_dir;
- int retval = 0;
-
- /*
- * 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 (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);
- }
-
- 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;
- }
-
- if (!read_ref_full("HEAD", RESOLVE_REF_READING, sha1, &flag))
- return fn("HEAD", sha1, flag, cb_data);
-
- return 0;
-}
-
-int head_ref(each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(NULL, fn, cb_data);
-}
-
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return do_head_ref(submodule, fn, cb_data);
-}
-
-int for_each_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
-}
-
-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);
-}
-
-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);
-}
-
-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);
-}
-
-int for_each_tag_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/tags/", fn, cb_data);
-}
-
-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);
-}
-
-int for_each_branch_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/heads/", fn, cb_data);
-}
-
-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);
-}
-
-int for_each_remote_ref(each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in("refs/remotes/", fn, cb_data);
-}
-
-int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
-{
- return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
-}
-
-int for_each_replace_ref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data);
-}
-
-int head_ref_namespaced(each_ref_fn fn, void *cb_data)
-{
- 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, RESOLVE_REF_READING, sha1, &flag))
- ret = fn(buf.buf, sha1, flag, cb_data);
- strbuf_release(&buf);
-
- return ret;
-}
-
-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(&ref_cache, buf.buf, fn, 0, 0, cb_data);
- strbuf_release(&buf);
- return ret;
-}
-
-int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
- const char *prefix, void *cb_data)
-{
- 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);
-
- 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, '*');
- }
-
- 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;
-}
-
-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);
-}
-
-int for_each_rawref(each_ref_fn fn, void *cb_data)
-{
- return do_for_each_ref(&ref_cache, "", fn, 0,
- DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
-}
-
-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);
-}
-
-static const char *ref_rev_parse_rules[] = {
- "%.*s",
- "refs/%.*s",
- "refs/tags/%.*s",
- "refs/heads/%.*s",
- "refs/remotes/%.*s",
- "refs/remotes/%.*s/HEAD",
- NULL
-};
-
-int refname_match(const char *abbrev_name, const char *full_name)
-{
- const char **p;
- const int abbrev_name_len = strlen(abbrev_name);
-
- for (p = ref_rev_parse_rules; *p; p++) {
- if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
- return 1;
- }
- }
-
- return 0;
-}
-
-/* This function should make sure errno is meaningful on error */
-static struct ref_lock *verify_lock(struct ref_lock *lock,
- const unsigned char *old_sha1, int mustexist)
-{
- if (read_ref_full(lock->ref_name,
- mustexist ? RESOLVE_REF_READING : 0,
- lock->old_sha1, NULL)) {
- int save_errno = errno;
- error("Can't verify ref %s", lock->ref_name);
- unlock_ref(lock);
- errno = save_errno;
- 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);
- errno = EBUSY;
- 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, save_errno;
-
- strbuf_init(&path, 20);
- strbuf_addstr(&path, file);
-
- result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
- save_errno = errno;
-
- strbuf_release(&path);
- errno = save_errno;
-
- return result;
-}
-
-/*
- * *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 (ret == *len) {
- size_t size;
- *string = strbuf_detach(&buf, &size);
- *len = size;
- return (char *)*string;
- }
-
- return NULL;
-}
-
-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;
-
- *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;
-
- this_result = refs_found ? sha1_from_ref : sha1;
- mksnpath(fullref, sizeof(fullref), *p, len, str);
- r = resolve_ref_unsafe(fullref, 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, "HEAD")) {
- warning("ignoring dangling symref %s.", fullref);
- } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
- warning("ignoring broken ref %s.", fullref);
- }
- }
- free(last_branch);
- return refs_found;
-}
-
-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;
-
- *log = NULL;
- for (p = ref_rev_parse_rules; *p; p++) {
- unsigned char hash[20];
- char path[PATH_MAX];
- const char *ref, *it;
-
- mksnpath(path, sizeof(path), *p, len, str);
- ref = resolve_ref_unsafe(path, RESOLVE_REF_READING,
- hash, NULL);
- if (!ref)
- continue;
- if (reflog_exists(path))
- it = path;
- else if (strcmp(ref, path) && reflog_exists(ref))
- it = ref;
- else
- continue;
- if (!logs_found++) {
- *log = xstrdup(it);
- hashcpy(sha1, hash);
- }
- if (!warn_ambiguous_refs)
- break;
- }
- free(last_branch);
- return logs_found;
-}
-
-/*
- * Locks a ref returning the lock on success and NULL on failure.
- * On failure errno is set to something meaningful.
- */
-static struct ref_lock *lock_ref_sha1_basic(const char *refname,
- const unsigned char *old_sha1,
- const struct string_list *skip,
- 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 resolve_flags = 0;
- int missing = 0;
- int attempts_remaining = 3;
-
- lock = xcalloc(1, sizeof(struct ref_lock));
- lock->lock_fd = -1;
-
- if (mustexist)
- resolve_flags |= RESOLVE_REF_READING;
- if (flags & REF_DELETING) {
- resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
- if (flags & REF_NODEREF)
- resolve_flags |= RESOLVE_REF_NO_RECURSE;
- }
-
- refname = resolve_ref_unsafe(refname, resolve_flags,
- lock->old_sha1, &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, resolve_flags,
- lock->old_sha1, &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, skip, get_packed_refs(&ref_cache))) {
- last_errno = ENOTDIR;
- goto error_return;
- }
-
- lock->lk = xcalloc(1, sizeof(struct lock_file));
-
- lflags = 0;
- if (flags & REF_NODEREF) {
- refname = orig_refname;
- lflags |= LOCK_NO_DEREF;
- }
- 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;
- }
-
- lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
- if (lock->lock_fd < 0) {
- last_errno = errno;
- if (errno == ENOENT && --attempts_remaining > 0)
- /*
- * Maybe somebody just deleted one of the
- * directories leading to ref_file. Try
- * again:
- */
- goto retry;
- else {
- struct strbuf err = STRBUF_INIT;
- unable_to_lock_message(ref_file, errno, &err);
- error("%s", err.buf);
- strbuf_release(&err);
- goto error_return;
- }
- }
- return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
-
- error_return:
- unlock_ref(lock);
- errno = last_errno;
- return NULL;
-}
-
-struct ref_lock *lock_any_ref_for_update(const char *refname,
- const unsigned char *old_sha1,
- int flags, int *type_p)
-{
- return lock_ref_sha1_basic(refname, old_sha1, NULL, 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(FILE *fh, char *refname, unsigned char *sha1,
- unsigned char *peeled)
-{
- fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname);
- if (peeled)
- fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled));
-}
-
-/*
- * 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)
-{
- enum peel_status peel_status = peel_entry(entry, 0);
-
- 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(cb_data, entry->name, entry->u.value.sha1,
- peel_status == PEEL_PEELED ?
- entry->u.value.peeled : NULL);
- return 0;
-}
-
-/* This should return a meaningful errno on failure */
-int lock_packed_refs(int flags)
-{
- struct packed_ref_cache *packed_ref_cache;
-
- 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;
-}
-
-/*
- * Commit the packed refs changes.
- * On error we must make sure that errno contains a meaningful value.
- */
-int commit_packed_refs(void)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
- int error = 0;
- int save_errno = 0;
- FILE *out;
-
- if (!packed_ref_cache->lock)
- die("internal error: packed-refs not locked");
-
- out = fdopen_lock_file(packed_ref_cache->lock, "w");
- if (!out)
- die_errno("unable to fdopen packed-refs descriptor");
-
- fprintf_or_die(out, "%s", PACKED_REFS_HEADER);
- do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
- 0, write_packed_entry_fn, out);
-
- if (commit_lock_file(packed_ref_cache->lock)) {
- save_errno = errno;
- error = -1;
- }
- packed_ref_cache->lock = NULL;
- release_packed_ref_cache(packed_ref_cache);
- errno = save_errno;
- return error;
-}
-
-void rollback_packed_refs(void)
-{
- struct packed_ref_cache *packed_ref_cache =
- get_packed_ref_cache(&ref_cache);
-
- 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);
-}
-
-struct ref_to_prune {
- struct ref_to_prune *next;
- unsigned char sha1[20];
- char name[FLEX_ARRAY];
-};
-
-struct pack_refs_cb_data {
- unsigned int flags;
- struct ref_dir *packed_refs;
- struct ref_to_prune *ref_to_prune;
+ unsigned char osha1[20];
+ unsigned char nsha1[20];
+ int tz;
+ unsigned long date;
+ char **msg;
+ unsigned long *cutoff_time;
+ int *cutoff_tz;
+ int *cutoff_cnt;
};
-/*
- * 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.
- */
-static int pack_if_possible_fn(struct ref_entry *entry, 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/");
-
- /* ALWAYS pack tags */
- if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref)
- return 0;
-
- /* Do not pack symbolic or broken refs: */
- if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry))
- return 0;
-
- /* 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;
-}
-
-/*
- * Remove empty parents, but spare refs/ and immediate subdirs.
- * Note: munges *name.
- */
-static void try_remove_empty_parents(char *name)
-{
- 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;
- }
-}
-
-/* make sure nobody touched the ref, and unlink */
-static void prune_ref(struct ref_to_prune *r)
-{
- struct ref_transaction *transaction;
- struct strbuf err = STRBUF_INIT;
-
- if (check_refname_format(r->name, 0))
- return;
-
- transaction = ref_transaction_begin(&err);
- if (!transaction ||
- ref_transaction_delete(transaction, r->name, r->sha1,
- REF_ISPRUNING, 1, NULL, &err) ||
- ref_transaction_commit(transaction, &err)) {
- ref_transaction_free(transaction);
- error("%s", err.buf);
- strbuf_release(&err);
- return;
- }
- ref_transaction_free(transaction);
- strbuf_release(&err);
- try_remove_empty_parents(r->name);
-}
-
-static void prune_refs(struct ref_to_prune *r)
-{
- while (r) {
- prune_ref(r);
- r = r->next;
- }
-}
-
-int pack_refs(unsigned int flags)
+static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1,
+ const char *email, unsigned long timestamp, int tz,
+ const char *message, void *cb_data)
{
- struct pack_refs_cb_data cbdata;
-
- memset(&cbdata, 0, sizeof(cbdata));
- cbdata.flags = flags;
-
- lock_packed_refs(LOCK_DIE_ON_ERROR);
- cbdata.packed_refs = get_packed_refs(&ref_cache);
-
- do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
- pack_if_possible_fn, &cbdata);
-
- if (commit_packed_refs())
- die_errno("unable to overwrite old ref-pack file");
-
- prune_refs(cbdata.ref_to_prune);
- return 0;
-}
+ struct read_ref_at_cb *cb = cb_data;
-/*
- * 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)
-{
- struct string_list *refs_to_delete = cb_data;
+ cb->reccnt++;
+ cb->tz = tz;
+ cb->date = timestamp;
- 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, 0, sha1, &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;
- }
+ 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;
/*
- * 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.
+ * we have not yet updated cb->[n|o]sha1 so they still
+ * hold the values for the previous record.
*/
- error("%s does not point to a valid object!", entry->name);
- string_list_append(refs_to_delete, entry->name);
- return 0;
- }
-
- return 0;
-}
-
-int repack_without_refs(struct string_list *refnames, struct strbuf *err)
-{
- struct ref_dir *packed;
- struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
- struct string_list_item *refname, *ref_to_delete;
- int ret, needs_repacking = 0, removed = 0;
-
- assert(err);
-
- /* Look for a packed ref */
- for_each_string_list_item(refname, refnames) {
- if (get_packed_ref(refname->string)) {
- needs_repacking = 1;
- break;
+ if (!is_null_sha1(cb->osha1)) {
+ hashcpy(cb->sha1, nsha1);
+ if (hashcmp(cb->osha1, nsha1))
+ 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, nsha1);
+ else if (hashcmp(nsha1, 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, osha1);
+ hashcpy(cb->nsha1, nsha1);
+ cb->found_it = 1;
+ return 1;
}
-
- /* Avoid locking if we have nothing to do */
- if (!needs_repacking)
- return 0; /* no refname exists in packed refs */
-
- if (lock_packed_refs(0)) {
- unable_to_lock_message(git_path("packed-refs"), errno, err);
- return -1;
- }
- packed = get_packed_refs(&ref_cache);
-
- /* Remove refnames from the cache */
- for_each_string_list_item(refname, refnames)
- if (remove_entry(packed, refname->string) != -1)
- removed = 1;
- if (!removed) {
- /*
- * All packed entries disappeared while we were
- * acquiring the lock.
- */
- rollback_packed_refs();
- return 0;
- }
-
- /* 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");
- }
-
- /* Write what remains */
- ret = commit_packed_refs();
- if (ret)
- strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
- strerror(errno));
- return ret;
-}
-
-static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
-{
- assert(err);
-
- if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
- /*
- * loose. The loose file name is the same as the
- * lockfile name, minus ".lock":
- */
- char *loose_filename = get_locked_file_path(lock->lk);
- int res = unlink_or_msg(loose_filename, err);
- free(loose_filename);
- if (res)
- return 1;
- }
+ hashcpy(cb->osha1, osha1);
+ hashcpy(cb->nsha1, nsha1);
+ if (cb->cnt > 0)
+ cb->cnt--;
return 0;
}
-int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
+static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
+ const char *email, unsigned long timestamp,
+ int tz, const char *message, void *cb_data)
{
- struct ref_transaction *transaction;
- struct strbuf err = STRBUF_INIT;
+ struct read_ref_at_cb *cb = cb_data;
- transaction = ref_transaction_begin(&err);
- if (!transaction ||
- ref_transaction_delete(transaction, refname, sha1, delopt,
- sha1 && !is_null_sha1(sha1), NULL, &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;
+ 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, osha1);
+ if (is_null_sha1(cb->sha1))
+ hashcpy(cb->sha1, nsha1);
+ /* We just want the first entry */
+ return 1;
}
-/*
- * 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"
+int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
+ unsigned char *sha1, char **msg,
+ unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
+{
+ struct read_ref_at_cb cb;
-static int rename_tmp_log(const char *newrefname)
-{
- int attempts_remaining = 4;
+ 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;
- 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);
- return -1;
- }
+ for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
- 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 (!cb.reccnt) {
+ if (flags & GET_SHA1_QUIETLY)
+ exit(128);
+ else
+ die("Log for %s is empty.", refname);
}
- return 0;
+ if (cb.found_it)
+ return 0;
+
+ for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
+
+ return 1;
}
-static int rename_ref_available(const char *oldname, const char *newname)
+struct ref_transaction *ref_transaction_begin(struct strbuf *err)
{
- struct string_list skip = STRING_LIST_INIT_NODUP;
- int ret;
+ assert(err);
- string_list_insert(&skip, oldname);
- ret = is_refname_available(newname, &skip, get_packed_refs(&ref_cache))
- && is_refname_available(newname, &skip, get_loose_refs(&ref_cache));
- string_list_clear(&skip, 0);
- return ret;
+ return xcalloc(1, sizeof(struct ref_transaction));
}
-static int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1,
- const char *logmsg);
-
-int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
+void ref_transaction_free(struct ref_transaction *transaction)
{
- 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;
-
- if (log && S_ISLNK(loginfo.st_mode))
- return error("reflog for %s is a symlink", oldrefname);
+ int i;
- symref = resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING,
- orig_sha1, &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 (!transaction)
+ return;
- if (!rename_ref_available(oldrefname, newrefname))
- return 1;
+ for (i = 0; i < transaction->nr; i++) {
+ free(transaction->updates[i]->msg);
+ free(transaction->updates[i]);
+ }
+ free(transaction->updates);
+ free(transaction);
+}
- 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));
+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)
+{
+ struct ref_update *update;
- if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
- error("unable to delete old %s", oldrefname);
- goto rollback;
- }
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: update called for transaction that is not open");
- if (!read_ref_full(newrefname, RESOLVE_REF_READING, sha1, NULL) &&
- 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;
- }
- }
+ if ((flags & REF_ISPRUNING) && !(flags & REF_NODEREF))
+ die("BUG: REF_ISPRUNING set without REF_NODEREF");
- if (log && rename_tmp_log(newrefname))
- goto rollback;
+ FLEX_ALLOC_STR(update, refname, refname);
+ ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
+ transaction->updates[transaction->nr++] = update;
- logmoved = log;
+ update->flags = flags;
- lock = lock_ref_sha1_basic(newrefname, NULL, 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;
- }
+ if (flags & REF_HAVE_NEW)
+ hashcpy(update->new_sha1, new_sha1);
+ if (flags & REF_HAVE_OLD)
+ hashcpy(update->old_sha1, old_sha1);
+ update->msg = xstrdup_or_null(msg);
+ return update;
+}
- return 0;
+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)
+{
+ assert(err);
- rollback:
- lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, 0, NULL);
- if (!lock) {
- error("unable to lock %s for rollback", oldrefname);
- goto rollbacklog;
+ 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;
}
- 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));
+ flags |= (new_sha1 ? REF_HAVE_NEW : 0) | (old_sha1 ? REF_HAVE_OLD : 0);
- return 1;
+ ref_transaction_add_update(transaction, refname, flags,
+ new_sha1, old_sha1, msg);
+ return 0;
}
-int close_ref(struct ref_lock *lock)
+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)
{
- if (close_lock_file(lock->lk))
- return -1;
- lock->lock_fd = -1;
- return 0;
+ 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 commit_ref(struct ref_lock *lock)
+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)
{
- if (commit_lock_file(lock->lk))
- return -1;
- lock->lock_fd = -1;
- return 0;
+ 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);
}
-void unlock_ref(struct ref_lock *lock)
+int ref_transaction_verify(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags,
+ struct strbuf *err)
{
- /* 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 (!old_sha1)
+ die("BUG: verify called with old_sha1 set to NULL");
+ return ref_transaction_update(transaction, refname,
+ NULL, old_sha1,
+ flags, NULL, err);
}
-/*
- * 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.
- */
-static int copy_msg(char *buf, const char *msg)
+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)
{
- char *cp = buf;
- char c;
- int wasspace = 1;
-
- *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;
+ return update_ref(msg, refname, new_oid ? new_oid->hash : NULL,
+ old_oid ? old_oid->hash : NULL, flags, onerr);
}
-/* This function must set a meaningful errno on failure */
-int log_ref_setup(const char *refname, char *logfile, int bufsize)
+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)
{
- int logfd, oflags = O_APPEND | O_WRONLY;
+ struct ref_transaction *t = NULL;
+ struct strbuf err = STRBUF_INIT;
+ int ret = 0;
- 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) {
- int save_errno = errno;
- error("unable to create directory for %s", logfile);
- errno = save_errno;
- return -1;
+ if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
+ ret = write_pseudoref(refname, new_sha1, old_sha1, &err);
+ } else {
+ t = ref_transaction_begin(&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);
}
- oflags |= O_CREAT;
}
+ if (ret) {
+ const char *str = "update_ref failed for ref '%s': %s";
- logfd = open(logfile, oflags, 0666);
- if (logfd < 0) {
- if (!(oflags & O_CREAT) && (errno == ENOENT || errno == EISDIR))
- return 0;
-
- if (errno == EISDIR) {
- if (remove_empty_directories(logfile)) {
- int save_errno = errno;
- error("There are still logs under '%s'",
- logfile);
- errno = save_errno;
- return -1;
- }
- logfd = open(logfile, oflags, 0666);
- }
-
- if (logfd < 0) {
- int save_errno = errno;
- error("Unable to append to %s: %s", logfile,
- strerror(errno));
- errno = save_errno;
- return -1;
+ 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;
}
-
- adjust_shared_perm(logfile);
- close(logfd);
+ strbuf_release(&err);
+ if (t)
+ ref_transaction_free(t);
return 0;
}
-static int log_ref_write(const char *refname, const unsigned char *old_sha1,
- const unsigned char *new_sha1, const char *msg)
+char *shorten_unambiguous_ref(const char *refname, int strict)
{
- int logfd, result, written, oflags = O_APPEND | O_WRONLY;
- unsigned maxlen, len;
- int msglen;
- char log_file[PATH_MAX];
- char *logrec;
- const char *committer;
+ int i;
+ static char **scanf_fmts;
+ static int nr_rules;
+ char *short_name;
- if (log_all_ref_updates < 0)
- log_all_ref_updates = !is_bare_repository();
+ 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;
- result = log_ref_setup(refname, log_file, sizeof(log_file));
- if (result)
- return result;
+ /* 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;
- 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 (written != len) {
- int save_errno = errno;
- close(logfd);
- error("Unable to append to %s", log_file);
- errno = save_errno;
- return -1;
- }
- if (close(logfd)) {
- int save_errno = errno;
- error("Unable to append to %s", log_file);
- errno = save_errno;
- return -1;
+ scanf_fmts = xmalloc(st_add(st_mult(sizeof(char *), nr_rules), 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;
+ }
}
- return 0;
-}
-int is_branch(const char *refname)
-{
- return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
-}
+ /* bail out if there are no rules */
+ if (!nr_rules)
+ return xstrdup(refname);
-/*
- * Write sha1 into the ref specified by the lock. Make sure that errno
- * is sane on error.
- */
-static int write_ref_sha1(struct ref_lock *lock,
- const unsigned char *sha1, const char *logmsg)
-{
- static char term = '\n';
- struct object *o;
+ /* 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;
+
+ if (1 != sscanf(refname, scanf_fmts[i], short_name))
+ continue;
+
+ short_name_len = strlen(short_name);
+
+ /*
+ * 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;
+
+ /*
+ * 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];
+
+ /* skip matched rule */
+ if (i == j)
+ continue;
+
+ /*
+ * 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;
+ }
- if (!lock) {
- errno = EINVAL;
- 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);
- errno = EINVAL;
- 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);
- errno = EINVAL;
- 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) {
- int save_errno = errno;
- error("Couldn't write %s", lock->lk->filename.buf);
- unlock_ref(lock);
- errno = save_errno;
- 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).
+ * short name is non-ambiguous if all previous rules
+ * haven't resolved to a valid ref
*/
- unsigned char head_sha1[20];
- int head_flag;
- const char *head_ref;
- head_ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
- head_sha1, &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 (j == rules_to_fail)
+ return short_name;
}
- if (commit_ref(lock)) {
- error("Couldn't set %s", lock->ref_name);
- unlock_ref(lock);
- return -1;
+
+ free(short_name);
+ return xstrdup(refname);
+}
+
+static struct string_list *hide_refs;
+
+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;
+
+ 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);
}
- unlock_ref(lock);
return 0;
}
-int create_symref(const char *ref_target, const char *refs_heads_master,
- const char *logmsg)
+int ref_is_hidden(const char *refname, const char *refname_full)
{
- 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];
+ int i;
- if (logmsg && read_ref(ref_target, old_sha1))
- hashclr(old_sha1);
+ 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;
+ int len;
- if (safe_create_leading_directories(git_HEAD) < 0)
- return error("unable to create directory for %s", git_HEAD);
+ if (*match == '!') {
+ neg = 1;
+ match++;
+ }
-#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
+ if (*match == '^') {
+ subject = refname_full;
+ match++;
+ } else {
+ subject = refname;
+ }
- 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 (rename(lockpath, git_HEAD) < 0) {
- error("Unable to create %s", git_HEAD);
- goto error_unlink_return;
- }
- 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);
- return -1;
+ /* refname can be NULL when namespaces are used. */
+ if (!subject || !starts_with(subject, match))
+ continue;
+ len = strlen(match);
+ if (!subject[len] || subject[len] == '/')
+ return !neg;
}
-
-#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;
}
-struct read_ref_at_cb {
- const char *refname;
- unsigned long at_time;
- int cnt;
- int reccnt;
- unsigned char *sha1;
- int found_it;
+const char *find_descendant_ref(const char *dirname,
+ const struct string_list *extras,
+ const struct string_list *skip)
+{
+ int pos;
- unsigned char osha1[20];
- unsigned char nsha1[20];
- int tz;
- unsigned long date;
- char **msg;
- unsigned long *cutoff_time;
- int *cutoff_tz;
- int *cutoff_cnt;
-};
+ if (!extras)
+ return NULL;
-static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1,
- const char *email, unsigned long timestamp, int tz,
- const char *message, void *cb_data)
-{
- struct read_ref_at_cb *cb = cb_data;
+ /*
+ * 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;
- cb->reccnt++;
- cb->tz = tz;
- cb->date = timestamp;
+ if (!starts_with(extra_refname, dirname))
+ break;
- 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, nsha1);
- if (hashcmp(cb->osha1, nsha1))
- warning("Log for ref %s has gap after %s.",
- cb->refname, show_date(cb->date, cb->tz, DATE_RFC2822));
- }
- else if (cb->date == cb->at_time)
- hashcpy(cb->sha1, nsha1);
- else if (hashcmp(nsha1, cb->sha1))
- warning("Log for ref %s unexpectedly ended on %s.",
- cb->refname, show_date(cb->date, cb->tz,
- DATE_RFC2822));
- hashcpy(cb->osha1, osha1);
- hashcpy(cb->nsha1, nsha1);
- cb->found_it = 1;
- return 1;
+ if (!skip || !string_list_has_string(skip, extra_refname))
+ return extra_refname;
}
- hashcpy(cb->osha1, osha1);
- hashcpy(cb->nsha1, nsha1);
- if (cb->cnt > 0)
- cb->cnt--;
- return 0;
+ return NULL;
}
-static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
- const char *email, unsigned long timestamp,
- int tz, const char *message, void *cb_data)
+int rename_ref_available(const char *old_refname, const char *new_refname)
{
- struct read_ref_at_cb *cb = cb_data;
+ struct string_list skip = STRING_LIST_INIT_NODUP;
+ struct strbuf err = STRBUF_INIT;
+ int ok;
- 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, osha1);
- if (is_null_sha1(cb->sha1))
- hashcpy(cb->sha1, nsha1);
- /* We just want the first entry */
- return 1;
+ string_list_insert(&skip, old_refname);
+ ok = !verify_refname_available(new_refname, NULL, &skip, &err);
+ if (!ok)
+ error("%s", err.buf);
+
+ string_list_clear(&skip, 0);
+ strbuf_release(&err);
+ return ok;
}
-int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
- unsigned char *sha1, char **msg,
- unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
+int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
- struct read_ref_at_cb cb;
-
- 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;
+ struct object_id oid;
+ int flag;
- for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
+ if (submodule) {
+ if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
+ return fn("HEAD", &oid, 0, cb_data);
- if (!cb.reccnt) {
- if (flags & GET_SHA1_QUIETLY)
- exit(128);
- else
- die("Log for %s is empty.", refname);
- }
- if (cb.found_it)
return 0;
+ }
- for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
+ if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
+ return fn("HEAD", &oid, flag, cb_data);
- return 1;
+ return 0;
}
-int reflog_exists(const char *refname)
+int head_ref(each_ref_fn fn, void *cb_data)
{
- struct stat st;
-
- return !lstat(git_path("logs/%s", refname), &st) &&
- S_ISREG(st.st_mode);
+ return head_ref_submodule(NULL, fn, cb_data);
}
-int delete_reflog(const char *refname)
+/*
+ * 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 do_for_each_ref(const char *submodule, const char *prefix,
+ each_ref_fn fn, int trim, int flags, void *cb_data)
{
- return remove_path(git_path("logs/%s", refname));
+ struct ref_store *refs = get_ref_store(submodule);
+ struct ref_iterator *iter;
+
+ if (!refs)
+ return 0;
+
+ iter = refs->be->iterator_begin(refs, prefix, flags);
+ iter = prefix_ref_iterator_begin(iter, prefix, trim);
+
+ return do_for_each_ref_iterator(iter, fn, cb_data);
}
-static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
+int for_each_ref(each_ref_fn fn, void *cb_data)
{
- unsigned char osha1[20], nsha1[20];
- char *email_end, *message;
- unsigned long timestamp;
- int tz;
-
- /* 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);
+ return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
}
-static char *find_beginning_of_line(char *bob, char *scan)
+int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
- while (bob < scan && *(--scan) != '\n')
- ; /* keep scanning backwards */
- /*
- * Return either beginning of the buffer, or LF at the end of
- * the previous line.
- */
- return scan;
+ return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
}
-int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
+int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
{
- struct strbuf sb = STRBUF_INIT;
- FILE *logfp;
- long pos;
- int ret = 0, at_tail = 1;
+ return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
+}
- logfp = fopen(git_path("logs/%s", refname), "r");
- if (!logfp)
- return -1;
+int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
+{
+ unsigned int flag = 0;
- /* 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') {
- /*
- * The newline is the end of the previous line,
- * so we know we have complete line starting
- * at (bp + 1). Prefix it onto any prior data
- * we collected for the line and process it.
- */
- 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;
- } else if (!pos) {
- /*
- * We are at the start of the buffer, and the
- * start of the file; there is no previous
- * line, and we have everything for this one.
- * Process it, and we can end the loop.
- */
- strbuf_splice(&sb, 0, 0, buf, endp - buf);
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- strbuf_reset(&sb);
- break;
- }
+ if (broken)
+ flag = DO_FOR_EACH_INCLUDE_BROKEN;
+ return do_for_each_ref(NULL, prefix, fn, 0, flag, cb_data);
+}
- if (bp == buf) {
- /*
- * We are at the start of the buffer, and there
- * is more file to read backwards. Which means
- * we are in the middle of a line. Note that we
- * may get here even if *bp was a newline; that
- * just means we are at the exact end of the
- * previous line, rather than some spot in the
- * middle.
- *
- * Save away what we have to be combined with
- * the data from the next read.
- */
- strbuf_splice(&sb, 0, 0, buf, endp - buf);
- break;
- }
- }
+int for_each_ref_in_submodule(const char *submodule, const char *prefix,
+ each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
+}
- }
- if (!ret && sb.len)
- die("BUG: reverse reflog parser had leftover data");
+int for_each_replace_ref(each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(NULL, git_replace_ref_base, fn,
+ strlen(git_replace_ref_base), 0, cb_data);
+}
- fclose(logfp);
- strbuf_release(&sb);
+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(NULL, buf.buf, fn, 0, 0, cb_data);
+ strbuf_release(&buf);
return ret;
}
-int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
+int for_each_rawref(each_ref_fn fn, void *cb_data)
{
- FILE *logfp;
- struct strbuf sb = STRBUF_INIT;
- int ret = 0;
-
- logfp = fopen(git_path("logs/%s", refname), "r");
- if (!logfp)
- return -1;
-
- while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
- ret = show_one_reflog_ent(&sb, fn, cb_data);
- fclose(logfp);
- strbuf_release(&sb);
- return ret;
+ return do_for_each_ref(NULL, "", fn, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
}
-/*
- * 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)
+
+/* This function needs to return a meaningful errno on failure */
+static const char *resolve_ref_recursively(struct ref_store *refs,
+ const char *refname,
+ int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- DIR *d = opendir(git_path("logs/%s", name->buf));
- int retval = 0;
- struct dirent *de;
- int oldlen = name->len;
+ static struct strbuf sb_refname = STRBUF_INIT;
+ int unused_flags;
+ int symref_count;
- if (!d)
- return name->len ? errno : 0;
+ if (!flags)
+ flags = &unused_flags;
- while ((de = readdir(d)) != NULL) {
- struct stat st;
+ *flags = 0;
- if (de->d_name[0] == '.')
- continue;
- if (ends_with(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, 0, sha1, NULL))
- retval = error("bad ref for %s", name->buf);
- else
- retval = fn(name->buf, sha1, 0, cb_data);
- }
- if (retval)
- break;
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
+ !refname_is_safe(refname)) {
+ errno = EINVAL;
+ return NULL;
}
- strbuf_setlen(name, oldlen);
+
+ /*
+ * 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.
+ */
+ *flags |= REF_BAD_NAME;
}
- closedir(d);
- return retval;
-}
-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;
-}
+ for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
+ unsigned int read_flags = 0;
-/**
- * Information needed for a single ref update. Set new_sha1 to the
- * new value or to zero to delete the ref. To check the old value
- * while locking the ref, set have_old to 1 and set old_sha1 to the
- * value or to zero to ensure the ref does not exist before update.
- */
-struct ref_update {
- unsigned char new_sha1[20];
- unsigned char old_sha1[20];
- int flags; /* REF_NODEREF? */
- int have_old; /* 1 if old_sha1 is valid, 0 otherwise */
- struct ref_lock *lock;
- int type;
- char *msg;
- const char refname[FLEX_ARRAY];
-};
+ if (refs->be->read_raw_ref(refs, refname,
+ sha1, &sb_refname, &read_flags)) {
+ *flags |= read_flags;
+ if (errno != ENOENT || (resolve_flags & RESOLVE_REF_READING))
+ return NULL;
+ hashclr(sha1);
+ if (*flags & REF_BAD_NAME)
+ *flags |= REF_ISBROKEN;
+ return refname;
+ }
-/*
- * Transaction states.
- * OPEN: The transaction is in a valid state and can accept new updates.
- * An OPEN transaction can be committed.
- * CLOSED: A closed transaction is no longer active and no other operations
- * than free can be used on it in this state.
- * A transaction can either become closed by successfully committing
- * an active transaction or if there is a failure while building
- * the transaction thus rendering it failed/inactive.
- */
-enum ref_transaction_state {
- REF_TRANSACTION_OPEN = 0,
- REF_TRANSACTION_CLOSED = 1
-};
+ *flags |= read_flags;
-/*
- * Data structure for holding a reference transaction, which can
- * consist of checks and updates to multiple references, carried out
- * as atomically as possible. This structure is opaque to callers.
- */
-struct ref_transaction {
- struct ref_update **updates;
- size_t alloc;
- size_t nr;
- enum ref_transaction_state state;
-};
+ if (!(read_flags & REF_ISSYMREF)) {
+ if (*flags & REF_BAD_NAME) {
+ hashclr(sha1);
+ *flags |= REF_ISBROKEN;
+ }
+ return refname;
+ }
-struct ref_transaction *ref_transaction_begin(struct strbuf *err)
-{
- assert(err);
+ 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;
+ }
- return xcalloc(1, sizeof(struct ref_transaction));
+ *flags |= REF_ISBROKEN | REF_BAD_NAME;
+ }
+ }
+
+ errno = ELOOP;
+ return NULL;
}
-void ref_transaction_free(struct ref_transaction *transaction)
+/* backend functions */
+int refs_init_db(struct strbuf *err)
{
- int i;
+ struct ref_store *refs = get_ref_store(NULL);
- if (!transaction)
- return;
-
- for (i = 0; i < transaction->nr; i++) {
- free(transaction->updates[i]->msg);
- free(transaction->updates[i]);
- }
- free(transaction->updates);
- free(transaction);
+ return refs->be->init_db(refs, err);
}
-static struct ref_update *add_update(struct ref_transaction *transaction,
- const char *refname)
+const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- size_t len = strlen(refname);
- struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1);
-
- strcpy((char *)update->refname, refname);
- ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
- transaction->updates[transaction->nr++] = update;
- return update;
+ return resolve_ref_recursively(get_ref_store(NULL), refname,
+ resolve_flags, sha1, flags);
}
-int ref_transaction_update(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- const unsigned char *old_sha1,
- int flags, int have_old, const char *msg,
- struct strbuf *err)
+int resolve_gitlink_ref(const char *submodule, const char *refname,
+ unsigned char *sha1)
{
- struct ref_update *update;
+ size_t len = strlen(submodule);
+ struct ref_store *refs;
+ int flags;
- assert(err);
+ while (len && submodule[len - 1] == '/')
+ len--;
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: update called for transaction that is not open");
+ if (!len)
+ return -1;
- if (have_old && !old_sha1)
- die("BUG: have_old is true but old_sha1 is NULL");
+ if (submodule[len]) {
+ /* We need to strip off one or more trailing slashes */
+ char *stripped = xmemdupz(submodule, len);
- if (!is_null_sha1(new_sha1) &&
- check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- strbuf_addf(err, "refusing to update ref with bad name %s",
- refname);
- return -1;
+ refs = get_ref_store(stripped);
+ free(stripped);
+ } else {
+ refs = get_ref_store(submodule);
}
- update = add_update(transaction, refname);
- hashcpy(update->new_sha1, new_sha1);
- update->flags = flags;
- update->have_old = have_old;
- if (have_old)
- hashcpy(update->old_sha1, old_sha1);
- if (msg)
- update->msg = xstrdup(msg);
+ if (!refs)
+ return -1;
+
+ if (!resolve_ref_recursively(refs, refname, 0, sha1, &flags) ||
+ is_null_sha1(sha1))
+ return -1;
return 0;
}
-int ref_transaction_create(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- int flags, const char *msg,
- struct strbuf *err)
-{
- struct ref_update *update;
+/* A pointer to the ref_store for the main repository: */
+static struct ref_store *main_ref_store;
- assert(err);
+/* A linked list of ref_stores for submodules: */
+static struct ref_store *submodule_ref_stores;
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: create called for transaction that is not open");
+void base_ref_store_init(struct ref_store *refs,
+ const struct ref_storage_be *be,
+ const char *submodule)
+{
+ refs->be = be;
+ if (!submodule) {
+ if (main_ref_store)
+ die("BUG: main_ref_store initialized twice");
- if (!new_sha1 || is_null_sha1(new_sha1))
- die("BUG: create ref with null new_sha1");
+ refs->submodule = "";
+ refs->next = NULL;
+ main_ref_store = refs;
+ } else {
+ if (lookup_ref_store(submodule))
+ die("BUG: ref_store for submodule '%s' initialized twice",
+ submodule);
- if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
- strbuf_addf(err, "refusing to create ref with bad name %s",
- refname);
- return -1;
+ refs->submodule = xstrdup(submodule);
+ refs->next = submodule_ref_stores;
+ submodule_ref_stores = refs;
}
-
- update = add_update(transaction, refname);
-
- hashcpy(update->new_sha1, new_sha1);
- hashclr(update->old_sha1);
- update->flags = flags;
- update->have_old = 1;
- if (msg)
- update->msg = xstrdup(msg);
- return 0;
}
-int ref_transaction_delete(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *old_sha1,
- int flags, int have_old, const char *msg,
- struct strbuf *err)
+struct ref_store *ref_store_init(const char *submodule)
{
- struct ref_update *update;
+ const char *be_name = "files";
+ struct ref_storage_be *be = find_ref_storage_backend(be_name);
- assert(err);
+ if (!be)
+ die("BUG: reference backend %s is unknown", be_name);
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: delete called for transaction that is not open");
+ if (!submodule || !*submodule)
+ return be->init(NULL);
+ else
+ return be->init(submodule);
+}
- if (have_old && !old_sha1)
- die("BUG: have_old is true but old_sha1 is NULL");
+struct ref_store *lookup_ref_store(const char *submodule)
+{
+ struct ref_store *refs;
- update = add_update(transaction, refname);
- update->flags = flags;
- update->have_old = have_old;
- if (have_old) {
- assert(!is_null_sha1(old_sha1));
- hashcpy(update->old_sha1, old_sha1);
+ if (!submodule || !*submodule)
+ return main_ref_store;
+
+ for (refs = submodule_ref_stores; refs; refs = refs->next) {
+ if (!strcmp(submodule, refs->submodule))
+ return refs;
}
- if (msg)
- update->msg = xstrdup(msg);
- return 0;
+
+ return NULL;
}
-int update_ref(const char *action, const char *refname,
- const unsigned char *sha1, const unsigned char *oldval,
- int flags, enum action_on_err onerr)
+struct ref_store *get_ref_store(const char *submodule)
{
- struct ref_transaction *t;
- struct strbuf err = STRBUF_INIT;
+ struct ref_store *refs;
- t = ref_transaction_begin(&err);
- if (!t ||
- ref_transaction_update(t, refname, sha1, oldval, flags,
- !!oldval, action, &err) ||
- ref_transaction_commit(t, &err)) {
- const char *str = "update_ref failed for ref '%s': %s";
+ if (!submodule || !*submodule) {
+ refs = lookup_ref_store(NULL);
- ref_transaction_free(t);
- 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;
+ if (!refs)
+ refs = ref_store_init(NULL);
+ } else {
+ refs = lookup_ref_store(submodule);
+
+ if (!refs) {
+ struct strbuf submodule_sb = STRBUF_INIT;
+
+ strbuf_addstr(&submodule_sb, submodule);
+ if (is_nonbare_repository_dir(&submodule_sb))
+ refs = ref_store_init(submodule);
+ strbuf_release(&submodule_sb);
}
- strbuf_release(&err);
- return 1;
}
- strbuf_release(&err);
- ref_transaction_free(t);
- return 0;
+
+ return refs;
}
-static int ref_update_compare(const void *r1, const void *r2)
+void assert_main_repository(struct ref_store *refs, const char *caller)
{
- const struct ref_update * const *u1 = r1;
- const struct ref_update * const *u2 = r2;
- return strcmp((*u1)->refname, (*u2)->refname);
+ if (*refs->submodule)
+ die("BUG: %s called for a submodule", caller);
}
-static int ref_update_reject_duplicates(struct ref_update **updates, int n,
- struct strbuf *err)
+/* backend functions */
+int pack_refs(unsigned int flags)
{
- int i;
-
- assert(err);
+ struct ref_store *refs = get_ref_store(NULL);
- for (i = 1; i < n; i++)
- if (!strcmp(updates[i - 1]->refname, updates[i]->refname)) {
- strbuf_addf(err,
- "Multiple updates for ref '%s' not allowed.",
- updates[i]->refname);
- return 1;
- }
- return 0;
+ return refs->be->pack_refs(refs, flags);
}
-int ref_transaction_commit(struct ref_transaction *transaction,
- struct strbuf *err)
+int peel_ref(const char *refname, unsigned char *sha1)
{
- int ret = 0, i;
- int n = transaction->nr;
- struct ref_update **updates = transaction->updates;
- struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
- struct string_list_item *ref_to_delete;
-
- assert(err);
+ struct ref_store *refs = get_ref_store(NULL);
- if (transaction->state != REF_TRANSACTION_OPEN)
- die("BUG: commit called for transaction that is not open");
-
- if (!n) {
- transaction->state = REF_TRANSACTION_CLOSED;
- return 0;
- }
+ return refs->be->peel_ref(refs, refname, sha1);
+}
- /* Copy, sort, and reject duplicate refs */
- qsort(updates, n, sizeof(*updates), ref_update_compare);
- if (ref_update_reject_duplicates(updates, n, err)) {
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
+int create_symref(const char *ref_target, const char *refs_heads_master,
+ const char *logmsg)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- /* Acquire all locks while verifying old values */
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
- int flags = update->flags;
-
- if (is_null_sha1(update->new_sha1))
- flags |= REF_DELETING;
- update->lock = lock_ref_sha1_basic(update->refname,
- (update->have_old ?
- update->old_sha1 :
- NULL),
- NULL,
- flags,
- &update->type);
- if (!update->lock) {
- ret = (errno == ENOTDIR)
- ? TRANSACTION_NAME_CONFLICT
- : TRANSACTION_GENERIC_ERROR;
- strbuf_addf(err, "Cannot lock the ref '%s'.",
- update->refname);
- goto cleanup;
- }
- }
+ return refs->be->create_symref(refs, ref_target, refs_heads_master,
+ logmsg);
+}
- /* Perform updates first so live commits remain referenced */
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
-
- if (!is_null_sha1(update->new_sha1)) {
- if (write_ref_sha1(update->lock, update->new_sha1,
- update->msg)) {
- update->lock = NULL; /* freed by write_ref_sha1 */
- strbuf_addf(err, "Cannot update the ref '%s'.",
- update->refname);
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
- update->lock = NULL; /* freed by write_ref_sha1 */
- }
- }
+int ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- /* Perform deletes now that updates are safely completed */
- for (i = 0; i < n; i++) {
- struct ref_update *update = updates[i];
+ return refs->be->transaction_commit(refs, transaction, err);
+}
- if (update->lock) {
- if (delete_ref_loose(update->lock, update->type, err)) {
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
+int verify_refname_available(const char *refname,
+ const struct string_list *extra,
+ const struct string_list *skip,
+ struct strbuf *err)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- if (!(update->flags & REF_ISPRUNING))
- string_list_append(&refs_to_delete,
- update->lock->ref_name);
- }
- }
+ return refs->be->verify_refname_available(refs, refname, extra, skip, err);
+}
- if (repack_without_refs(&refs_to_delete, err)) {
- ret = TRANSACTION_GENERIC_ERROR;
- goto cleanup;
- }
- for_each_string_list_item(ref_to_delete, &refs_to_delete)
- unlink_or_warn(git_path("logs/%s", ref_to_delete->string));
- clear_loose_ref_cache(&ref_cache);
+int for_each_reflog(each_ref_fn fn, void *cb_data)
+{
+ struct ref_store *refs = get_ref_store(NULL);
+ struct ref_iterator *iter;
-cleanup:
- transaction->state = REF_TRANSACTION_CLOSED;
+ iter = refs->be->reflog_iterator_begin(refs);
- for (i = 0; i < n; i++)
- if (updates[i]->lock)
- unlock_ref(updates[i]->lock);
- string_list_clear(&refs_to_delete, 0);
- return ret;
+ return do_for_each_ref_iterator(iter, fn, cb_data);
}
-char *shorten_unambiguous_ref(const char *refname, int strict)
+int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn,
+ void *cb_data)
{
- 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;
+ struct ref_store *refs = get_ref_store(NULL);
- scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
+ return refs->be->for_each_reflog_ent_reverse(refs, refname,
+ fn, cb_data);
+}
- 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;
- }
- }
+int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn,
+ void *cb_data)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- /* bail out if there are no rules */
- if (!nr_rules)
- return xstrdup(refname);
+ return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data);
+}
- /* buffer for scanf result, at most refname must fit */
- short_name = xstrdup(refname);
+int reflog_exists(const char *refname)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- /* 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->reflog_exists(refs, refname);
+}
- if (1 != sscanf(refname, scanf_fmts[i], short_name))
- continue;
+int safe_create_reflog(const char *refname, int force_create,
+ struct strbuf *err)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- short_name_len = strlen(short_name);
+ return refs->be->create_reflog(refs, refname, force_create, err);
+}
- /*
- * 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)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- /*
- * 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];
+ return refs->be->delete_reflog(refs, refname);
+}
- /* 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)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- /*
- * 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;
- }
+ return refs->be->reflog_expire(refs, refname, sha1, flags,
+ prepare_fn, should_prune_fn,
+ cleanup_fn, policy_cb_data);
+}
- /*
- * short name is non-ambiguous if all previous rules
- * haven't resolved to a valid ref
- */
- if (j == rules_to_fail)
- return short_name;
- }
+int initial_ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_store *refs = get_ref_store(NULL);
- free(short_name);
- return xstrdup(refname);
+ return refs->be->initial_transaction_commit(refs, transaction, err);
}
-static struct string_list *hide_refs;
-
-int parse_hide_refs_config(const char *var, const char *value, const char *section)
+int delete_refs(struct string_list *refnames, unsigned int flags)
{
- 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;
+ struct ref_store *refs = get_ref_store(NULL);
- 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;
+ return refs->be->delete_refs(refs, refnames, flags);
}
-int ref_is_hidden(const char *refname)
+int rename_ref(const char *oldref, const char *newref, const char *logmsg)
{
- struct string_list_item *item;
+ struct ref_store *refs = get_ref_store(NULL);
- 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;
+ return refs->be->rename_ref(refs, oldref, newref, logmsg);
}
projects / platform / upstream / git.git / blobdiff