Imported Upstream version 2.16.0
[platform/upstream/git.git] / builtin / clone.c
index 4646922..2da71db 100644 (file)
@@ -9,6 +9,7 @@
  */
 
 #include "builtin.h"
+#include "config.h"
 #include "lockfile.h"
 #include "parse-options.h"
 #include "fetch-pack.h"
@@ -24,6 +25,7 @@
 #include "remote.h"
 #include "run-command.h"
 #include "connected.h"
+#include "packfile.h"
 
 /*
  * Overall FIXMEs:
@@ -39,17 +41,39 @@ static const char * const builtin_clone_usage[] = {
 };
 
 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
-static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
-static char *option_template, *option_depth;
+static int option_local = -1, option_no_hardlinks, option_shared;
+static int option_no_tags;
+static int option_shallow_submodules;
+static int deepen;
+static char *option_template, *option_depth, *option_since;
 static char *option_origin = NULL;
 static char *option_branch = NULL;
+static struct string_list option_not = STRING_LIST_INIT_NODUP;
 static const char *real_git_dir;
 static char *option_upload_pack = "git-upload-pack";
 static int option_verbosity;
 static int option_progress = -1;
-static struct string_list option_config;
-static struct string_list option_reference;
+static enum transport_family family;
+static struct string_list option_config = STRING_LIST_INIT_NODUP;
+static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
+static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
 static int option_dissociate;
+static int max_jobs = -1;
+static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
+
+static int recurse_submodules_cb(const struct option *opt,
+                                const char *arg, int unset)
+{
+       if (unset)
+               string_list_clear((struct string_list *)opt->value, 0);
+       else if (arg)
+               string_list_append((struct string_list *)opt->value, arg);
+       else
+               string_list_append((struct string_list *)opt->value,
+                                  (const char *)opt->defval);
+
+       return 0;
+}
 
 static struct option builtin_clone_options[] = {
        OPT__VERBOSITY(&option_verbosity),
@@ -68,14 +92,21 @@ static struct option builtin_clone_options[] = {
                    N_("don't use local hardlinks, always copy")),
        OPT_BOOL('s', "shared", &option_shared,
                    N_("setup as shared repository")),
-       OPT_BOOL(0, "recursive", &option_recursive,
-                   N_("initialize submodules in the clone")),
-       OPT_BOOL(0, "recurse-submodules", &option_recursive,
-                   N_("initialize submodules in the clone")),
+       { OPTION_CALLBACK, 0, "recursive", &option_recurse_submodules,
+         N_("pathspec"), N_("initialize submodules in the clone"),
+         PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, recurse_submodules_cb,
+         (intptr_t)"." },
+       { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
+         N_("pathspec"), N_("initialize submodules in the clone"),
+         PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
+       OPT_INTEGER('j', "jobs", &max_jobs,
+                   N_("number of submodules cloned in parallel")),
        OPT_STRING(0, "template", &option_template, N_("template-directory"),
                   N_("directory from which templates will be used")),
-       OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
+       OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
                        N_("reference repository")),
+       OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
+                       N_("repo"), N_("reference repository")),
        OPT_BOOL(0, "dissociate", &option_dissociate,
                 N_("use --reference only while cloning")),
        OPT_STRING('o', "origin", &option_origin, N_("name"),
@@ -86,107 +117,166 @@ static struct option builtin_clone_options[] = {
                   N_("path to git-upload-pack on the remote")),
        OPT_STRING(0, "depth", &option_depth, N_("depth"),
                    N_("create a shallow clone of that depth")),
+       OPT_STRING(0, "shallow-since", &option_since, N_("time"),
+                   N_("create a shallow clone since a specific time")),
+       OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
+                       N_("deepen history of shallow clone, excluding rev")),
        OPT_BOOL(0, "single-branch", &option_single_branch,
                    N_("clone only one branch, HEAD or --branch")),
+       OPT_BOOL(0, "no-tags", &option_no_tags,
+                N_("don't clone any tags, and make later fetches not to follow them")),
+       OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
+                   N_("any cloned submodules will be shallow")),
        OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
                   N_("separate git dir from working tree")),
        OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
                        N_("set config inside the new repository")),
+       OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
+                       TRANSPORT_FAMILY_IPV4),
+       OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
+                       TRANSPORT_FAMILY_IPV6),
        OPT_END()
 };
 
-static const char *argv_submodule[] = {
-       "submodule", "update", "--init", "--recursive", NULL
-};
-
-static char *get_repo_path(const char *repo, int *is_bundle)
+static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 {
        static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
        static char *bundle_suffix[] = { ".bundle", "" };
+       size_t baselen = path->len;
        struct stat st;
        int i;
 
        for (i = 0; i < ARRAY_SIZE(suffix); i++) {
-               const char *path;
-               path = mkpath("%s%s", repo, suffix[i]);
-               if (stat(path, &st))
+               strbuf_setlen(path, baselen);
+               strbuf_addstr(path, suffix[i]);
+               if (stat(path->buf, &st))
                        continue;
-               if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
+               if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
                        *is_bundle = 0;
-                       return xstrdup(absolute_path(path));
+                       return path->buf;
                } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
                        /* Is it a "gitfile"? */
                        char signature[8];
-                       int len, fd = open(path, O_RDONLY);
+                       const char *dst;
+                       int len, fd = open(path->buf, O_RDONLY);
                        if (fd < 0)
                                continue;
                        len = read_in_full(fd, signature, 8);
                        close(fd);
                        if (len != 8 || strncmp(signature, "gitdir: ", 8))
                                continue;
-                       path = read_gitfile(path);
-                       if (path) {
+                       dst = read_gitfile(path->buf);
+                       if (dst) {
                                *is_bundle = 0;
-                               return xstrdup(absolute_path(path));
+                               return dst;
                        }
                }
        }
 
        for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
-               const char *path;
-               path = mkpath("%s%s", repo, bundle_suffix[i]);
-               if (!stat(path, &st) && S_ISREG(st.st_mode)) {
+               strbuf_setlen(path, baselen);
+               strbuf_addstr(path, bundle_suffix[i]);
+               if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
                        *is_bundle = 1;
-                       return xstrdup(absolute_path(path));
+                       return path->buf;
                }
        }
 
        return NULL;
 }
 
+static char *get_repo_path(const char *repo, int *is_bundle)
+{
+       struct strbuf path = STRBUF_INIT;
+       const char *raw;
+       char *canon;
+
+       strbuf_addstr(&path, repo);
+       raw = get_repo_path_1(&path, is_bundle);
+       canon = raw ? absolute_pathdup(raw) : NULL;
+       strbuf_release(&path);
+       return canon;
+}
+
 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 {
-       const char *end = repo + strlen(repo), *start;
+       const char *end = repo + strlen(repo), *start, *ptr;
+       size_t len;
        char *dir;
 
        /*
+        * Skip scheme.
+        */
+       start = strstr(repo, "://");
+       if (start == NULL)
+               start = repo;
+       else
+               start += 3;
+
+       /*
+        * Skip authentication data. The stripping does happen
+        * greedily, such that we strip up to the last '@' inside
+        * the host part.
+        */
+       for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
+               if (*ptr == '@')
+                       start = ptr + 1;
+       }
+
+       /*
         * Strip trailing spaces, slashes and /.git
         */
-       while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
+       while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
                end--;
-       if (end - repo > 5 && is_dir_sep(end[-5]) &&
+       if (end - start > 5 && is_dir_sep(end[-5]) &&
            !strncmp(end - 4, ".git", 4)) {
                end -= 5;
-               while (repo < end && is_dir_sep(end[-1]))
+               while (start < end && is_dir_sep(end[-1]))
                        end--;
        }
 
        /*
-        * Find last component, but be prepared that repo could have
-        * the form  "remote.example.com:foo.git", i.e. no slash
-        * in the directory part.
+        * Strip trailing port number if we've got only a
+        * hostname (that is, there is no dir separator but a
+        * colon). This check is required such that we do not
+        * strip URI's like '/foo/bar:2222.git', which should
+        * result in a dir '2222' being guessed due to backwards
+        * compatibility.
         */
-       start = end;
-       while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
-               start--;
+       if (memchr(start, '/', end - start) == NULL
+           && memchr(start, ':', end - start) != NULL) {
+               ptr = end;
+               while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
+                       ptr--;
+               if (start < ptr && ptr[-1] == ':')
+                       end = ptr - 1;
+       }
+
+       /*
+        * Find last component. To remain backwards compatible we
+        * also regard colons as path separators, such that
+        * cloning a repository 'foo:bar.git' would result in a
+        * directory 'bar' being guessed.
+        */
+       ptr = end;
+       while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
+               ptr--;
+       start = ptr;
 
        /*
         * Strip .{bundle,git}.
         */
-       if (is_bundle) {
-               if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
-                       end -= 7;
-       } else {
-               if (end - start > 4 && !strncmp(end - 4, ".git", 4))
-                       end -= 4;
-       }
+       len = end - start;
+       strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 
-       if (is_bare) {
-               struct strbuf result = STRBUF_INIT;
-               strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
-               dir = strbuf_detach(&result, NULL);
-       } else
-               dir = xstrndup(start, end - start);
+       if (!len || (len == 1 && *start == '/'))
+               die(_("No directory name could be guessed.\n"
+                     "Please specify a directory on the command line"));
+
+       if (is_bare)
+               dir = xstrfmt("%.*s.git", (int)len, start);
+       else
+               dir = xstrndup(start, len);
        /*
         * Replace sequences of 'control' characters and whitespace
         * with one ascii space, remove leading and trailing spaces.
@@ -224,45 +314,37 @@ static void strip_trailing_slashes(char *dir)
 
 static int add_one_reference(struct string_list_item *item, void *cb_data)
 {
-       char *ref_git;
-       const char *repo;
-       struct strbuf alternate = STRBUF_INIT;
-
-       /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
-       ref_git = xstrdup(real_path(item->string));
-
-       repo = read_gitfile(ref_git);
-       if (!repo)
-               repo = read_gitfile(mkpath("%s/.git", ref_git));
-       if (repo) {
-               free(ref_git);
-               ref_git = xstrdup(repo);
-       }
-
-       if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
-               char *ref_git_git = mkpathdup("%s/.git", ref_git);
-               free(ref_git);
-               ref_git = ref_git_git;
-       } else if (!is_directory(mkpath("%s/objects", ref_git)))
-               die(_("reference repository '%s' is not a local repository."),
-                   item->string);
-
-       if (!access(mkpath("%s/shallow", ref_git), F_OK))
-               die(_("reference repository '%s' is shallow"), item->string);
-
-       if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
-               die(_("reference repository '%s' is grafted"), item->string);
-
-       strbuf_addf(&alternate, "%s/objects", ref_git);
-       add_to_alternates_file(alternate.buf);
-       strbuf_release(&alternate);
+       struct strbuf err = STRBUF_INIT;
+       int *required = cb_data;
+       char *ref_git = compute_alternate_path(item->string, &err);
+
+       if (!ref_git) {
+               if (*required)
+                       die("%s", err.buf);
+               else
+                       fprintf(stderr,
+                               _("info: Could not add alternate for '%s': %s\n"),
+                               item->string, err.buf);
+       } else {
+               struct strbuf sb = STRBUF_INIT;
+               strbuf_addf(&sb, "%s/objects", ref_git);
+               add_to_alternates_file(sb.buf);
+               strbuf_release(&sb);
+       }
+
+       strbuf_release(&err);
        free(ref_git);
        return 0;
 }
 
 static void setup_reference(void)
 {
-       for_each_string_list(&option_reference, add_one_reference, NULL);
+       int required = 1;
+       for_each_string_list(&option_required_reference,
+                            add_one_reference, &required);
+       required = 0;
+       for_each_string_list(&option_optional_reference,
+                            add_one_reference, &required);
 }
 
 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
@@ -280,20 +362,24 @@ static void copy_alternates(struct strbuf *src, struct strbuf *dst,
         * to turn entries with paths relative to the original
         * absolute, so that they can be used in the new repository.
         */
-       FILE *in = fopen(src->buf, "r");
+       FILE *in = xfopen(src->buf, "r");
        struct strbuf line = STRBUF_INIT;
 
-       while (strbuf_getline(&line, in, '\n') != EOF) {
-               char *abs_path, abs_buf[PATH_MAX];
+       while (strbuf_getline(&line, in) != EOF) {
+               char *abs_path;
                if (!line.len || line.buf[0] == '#')
                        continue;
                if (is_absolute_path(line.buf)) {
                        add_to_alternates_file(line.buf);
                        continue;
                }
-               abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
-               normalize_path_copy(abs_buf, abs_path);
-               add_to_alternates_file(abs_buf);
+               abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
+               if (!normalize_path_copy(abs_path, abs_path))
+                       add_to_alternates_file(abs_path);
+               else
+                       warning("skipping invalid relative alternate: %s/%s",
+                               src_repo, line.buf);
+               free(abs_path);
        }
        strbuf_release(&line);
        fclose(in);
@@ -366,14 +452,17 @@ static void clone_local(const char *src_repo, const char *dest_repo)
 {
        if (option_shared) {
                struct strbuf alt = STRBUF_INIT;
-               strbuf_addf(&alt, "%s/objects", src_repo);
+               get_common_dir(&alt, src_repo);
+               strbuf_addstr(&alt, "/objects");
                add_to_alternates_file(alt.buf);
                strbuf_release(&alt);
        } else {
                struct strbuf src = STRBUF_INIT;
                struct strbuf dest = STRBUF_INIT;
-               strbuf_addf(&src, "%s/objects", src_repo);
-               strbuf_addf(&dest, "%s/objects", dest_repo);
+               get_common_dir(&src, src_repo);
+               get_common_dir(&dest, dest_repo);
+               strbuf_addstr(&src, "/objects");
+               strbuf_addstr(&dest, "/objects");
                copy_or_link_directory(&src, &dest, src_repo, src.len);
                strbuf_release(&src);
                strbuf_release(&dest);
@@ -419,8 +508,8 @@ static void remove_junk(void)
        if (junk_work_tree) {
                strbuf_addstr(&sb, junk_work_tree);
                remove_dir_recursively(&sb, 0);
-               strbuf_reset(&sb);
        }
+       strbuf_release(&sb);
 }
 
 static void remove_junk_on_signal(int signo)
@@ -480,7 +569,7 @@ static struct ref *wanted_peer_refs(const struct ref *refs,
        } else
                get_fetch_map(refs, refspec, &tail, 0);
 
-       if (!option_mirror && !option_single_branch)
+       if (!option_mirror && !option_single_branch && !option_no_tags)
                get_fetch_map(refs, tag_refspec, &tail, 0);
 
        return local_refs;
@@ -490,16 +579,26 @@ static void write_remote_refs(const struct ref *local_refs)
 {
        const struct ref *r;
 
-       lock_packed_refs(LOCK_DIE_ON_ERROR);
+       struct ref_transaction *t;
+       struct strbuf err = STRBUF_INIT;
+
+       t = ref_transaction_begin(&err);
+       if (!t)
+               die("%s", err.buf);
 
        for (r = local_refs; r; r = r->next) {
                if (!r->peer_ref)
                        continue;
-               add_packed_ref(r->peer_ref->name, r->old_sha1);
+               if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
+                                          0, NULL, &err))
+                       die("%s", err.buf);
        }
 
-       if (commit_packed_refs())
-               die_errno("unable to overwrite old ref-pack file");
+       if (initial_ref_transaction_commit(t, &err))
+               die("%s", err.buf);
+
+       strbuf_release(&err);
+       ref_transaction_free(t);
 }
 
 static void write_followtags(const struct ref *refs, const char *msg)
@@ -510,14 +609,14 @@ static void write_followtags(const struct ref *refs, const char *msg)
                        continue;
                if (ends_with(ref->name, "^{}"))
                        continue;
-               if (!has_sha1_file(ref->old_sha1))
+               if (!has_object_file(&ref->old_oid))
                        continue;
-               update_ref(msg, ref->name, ref->old_sha1,
-                          NULL, 0, UPDATE_REFS_DIE_ON_ERR);
+               update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
+                          UPDATE_REFS_DIE_ON_ERR);
        }
 }
 
-static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
+static int iterate_ref_map(void *cb_data, struct object_id *oid)
 {
        struct ref **rm = cb_data;
        struct ref *ref = *rm;
@@ -532,7 +631,7 @@ static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
        if (!ref)
                return -1;
 
-       hashcpy(sha1, ref->old_sha1);
+       oidcpy(oid, &ref->old_oid);
        *rm = ref->next;
        return 0;
 }
@@ -548,18 +647,18 @@ static void update_remote_refs(const struct ref *refs,
        const struct ref *rm = mapped_refs;
 
        if (check_connectivity) {
-               if (transport->progress)
-                       fprintf(stderr, _("Checking connectivity... "));
-               if (check_everything_connected_with_transport(iterate_ref_map,
-                                                             0, &rm, transport))
+               struct check_connected_options opt = CHECK_CONNECTED_INIT;
+
+               opt.transport = transport;
+               opt.progress = transport->progress;
+
+               if (check_connected(iterate_ref_map, &rm, &opt))
                        die(_("remote did not send all necessary objects"));
-               if (transport->progress)
-                       fprintf(stderr, _("done.\n"));
        }
 
        if (refs) {
                write_remote_refs(mapped_refs);
-               if (option_single_branch)
+               if (option_single_branch && !option_no_tags)
                        write_followtags(refs, msg);
        }
 
@@ -567,9 +666,11 @@ static void update_remote_refs(const struct ref *refs,
                struct strbuf head_ref = STRBUF_INIT;
                strbuf_addstr(&head_ref, branch_top);
                strbuf_addstr(&head_ref, "HEAD");
-               create_symref(head_ref.buf,
-                             remote_head_points_at->peer_ref->name,
-                             msg);
+               if (create_symref(head_ref.buf,
+                                 remote_head_points_at->peer_ref->name,
+                                 msg) < 0)
+                       die(_("unable to update %s"), head_ref.buf);
+               strbuf_release(&head_ref);
        }
 }
 
@@ -579,33 +680,34 @@ static void update_head(const struct ref *our, const struct ref *remote,
        const char *head;
        if (our && skip_prefix(our->name, "refs/heads/", &head)) {
                /* Local default branch link */
-               create_symref("HEAD", our->name, NULL);
+               if (create_symref("HEAD", our->name, NULL) < 0)
+                       die(_("unable to update HEAD"));
                if (!option_bare) {
-                       update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
+                       update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
                                   UPDATE_REFS_DIE_ON_ERR);
                        install_branch_config(0, head, option_origin, our->name);
                }
        } else if (our) {
-               struct commit *c = lookup_commit_reference(our->old_sha1);
+               struct commit *c = lookup_commit_reference(&our->old_oid);
                /* --branch specifies a non-branch (i.e. tags), detach HEAD */
-               update_ref(msg, "HEAD", c->object.sha1,
-                          NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
+               update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
+                          UPDATE_REFS_DIE_ON_ERR);
        } else if (remote) {
                /*
                 * We know remote HEAD points to a non-branch, or
                 * HEAD points to a branch but we don't know which one.
                 * Detach HEAD in all these cases.
                 */
-               update_ref(msg, "HEAD", remote->old_sha1,
-                          NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
+               update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
+                          UPDATE_REFS_DIE_ON_ERR);
        }
 }
 
-static int checkout(void)
+static int checkout(int submodule_progress)
 {
-       unsigned char sha1[20];
+       struct object_id oid;
        char *head;
-       struct lock_file *lock_file;
+       struct lock_file lock_file = LOCK_INIT;
        struct unpack_trees_options opts;
        struct tree *tree;
        struct tree_desc t;
@@ -614,7 +716,7 @@ static int checkout(void)
        if (option_no_checkout)
                return 0;
 
-       head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
+       head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
        if (!head) {
                warning(_("remote HEAD refers to nonexistent ref, "
                          "unable to checkout.\n"));
@@ -622,7 +724,7 @@ static int checkout(void)
        }
        if (!strcmp(head, "HEAD")) {
                if (advice_detached_head)
-                       detach_advice(sha1_to_hex(sha1));
+                       detach_advice(oid_to_hex(&oid));
        } else {
                if (!starts_with(head, "refs/heads/"))
                        die(_("HEAD not found below refs/heads!"));
@@ -632,8 +734,7 @@ static int checkout(void)
        /* We need to be in the new work tree for the checkout */
        setup_work_tree();
 
-       lock_file = xcalloc(1, sizeof(struct lock_file));
-       hold_locked_index(lock_file, 1);
+       hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 
        memset(&opts, 0, sizeof opts);
        opts.update = 1;
@@ -643,27 +744,46 @@ static int checkout(void)
        opts.src_index = &the_index;
        opts.dst_index = &the_index;
 
-       tree = parse_tree_indirect(sha1);
+       tree = parse_tree_indirect(&oid);
        parse_tree(tree);
        init_tree_desc(&t, tree->buffer, tree->size);
        if (unpack_trees(1, &t, &opts) < 0)
                die(_("unable to checkout working tree"));
 
-       if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+       if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
                die(_("unable to write new index file"));
 
        err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
-                          sha1_to_hex(sha1), "1", NULL);
+                          oid_to_hex(&oid), "1", NULL);
+
+       if (!err && (option_recurse_submodules.nr > 0)) {
+               struct argv_array args = ARGV_ARRAY_INIT;
+               argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
+
+               if (option_shallow_submodules == 1)
+                       argv_array_push(&args, "--depth=1");
+
+               if (max_jobs != -1)
+                       argv_array_pushf(&args, "--jobs=%d", max_jobs);
+
+               if (submodule_progress)
+                       argv_array_push(&args, "--progress");
 
-       if (!err && option_recursive)
-               err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
+               if (option_verbosity < 0)
+                       argv_array_push(&args, "--quiet");
+
+               err = run_command_v_opt(args.argv, RUN_GIT_CMD);
+               argv_array_clear(&args);
+       }
 
        return err;
 }
 
 static int write_one_config(const char *key, const char *value, void *data)
 {
-       return git_config_set_multivar(key, value ? value : "true", "^$", 0);
+       return git_config_set_multivar_gently(key,
+                                             value ? value : "true",
+                                             CONFIG_REGEX_NONE, 0);
 }
 
 static void write_config(struct string_list *config)
@@ -673,7 +793,7 @@ static void write_config(struct string_list *config)
        for (i = 0; i < config->nr; i++) {
                if (git_config_parse_parameter(config->items[i].string,
                                               write_one_config, NULL) < 0)
-                       die("unable to write parameters to config file");
+                       die(_("unable to write parameters to config file"));
        }
 }
 
@@ -732,11 +852,15 @@ static void write_refspec_config(const char *src_ref_prefix,
 static void dissociate_from_references(void)
 {
        static const char* argv[] = { "repack", "-a", "-d", NULL };
+       char *alternates = git_pathdup("objects/info/alternates");
 
-       if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
-               die(_("cannot repack to clean up"));
-       if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
-               die_errno(_("cannot unlink temporary alternates file"));
+       if (!access(alternates, F_OK)) {
+               if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
+                       die(_("cannot repack to clean up"));
+               if (unlink(alternates) && errno != ENOENT)
+                       die_errno(_("cannot unlink temporary alternates file"));
+       }
+       free(alternates);
 }
 
 int cmd_clone(int argc, const char **argv, const char *prefix)
@@ -757,6 +881,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
        const char *src_ref_prefix = "refs/heads/";
        struct remote *remote;
        int err = 0, complete_refs_before_fetch = 1;
+       int submodule_progress;
 
        struct refspec *refspec;
        const char *fetch_pattern;
@@ -773,8 +898,10 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
                usage_msg_opt(_("You must specify a repository to clone."),
                        builtin_clone_usage, builtin_clone_options);
 
+       if (option_depth || option_since || option_not.nr)
+               deepen = 1;
        if (option_single_branch == -1)
-               option_single_branch = option_depth ? 1 : 0;
+               option_single_branch = deepen ? 1 : 0;
 
        if (option_mirror)
                option_bare = 1;
@@ -795,7 +922,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 
        path = get_repo_path(repo_name, &is_bundle);
        if (path)
-               repo = xstrdup(absolute_path(repo_name));
+               repo = absolute_pathdup(repo_name);
        else if (!strchr(repo_name, ':'))
                die(_("repository '%s' does not exist"), repo_name);
        else
@@ -847,23 +974,58 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
                set_git_work_tree(work_tree);
        }
 
-       junk_git_dir = git_dir;
+       junk_git_dir = real_git_dir ? real_git_dir : git_dir;
        if (safe_create_leading_directories_const(git_dir) < 0)
                die(_("could not create leading directories of '%s'"), git_dir);
 
-       set_git_dir_init(git_dir, real_git_dir, 0);
-       if (real_git_dir) {
-               git_dir = real_git_dir;
-               junk_git_dir = real_git_dir;
-       }
-
        if (0 <= option_verbosity) {
                if (option_bare)
                        fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
                else
                        fprintf(stderr, _("Cloning into '%s'...\n"), dir);
        }
-       init_db(option_template, INIT_DB_QUIET);
+
+       if (option_recurse_submodules.nr > 0) {
+               struct string_list_item *item;
+               struct strbuf sb = STRBUF_INIT;
+
+               /* remove duplicates */
+               string_list_sort(&option_recurse_submodules);
+               string_list_remove_duplicates(&option_recurse_submodules, 0);
+
+               /*
+                * NEEDSWORK: In a multi-working-tree world, this needs to be
+                * set in the per-worktree config.
+                */
+               for_each_string_list_item(item, &option_recurse_submodules) {
+                       strbuf_addf(&sb, "submodule.active=%s",
+                                   item->string);
+                       string_list_append(&option_config,
+                                          strbuf_detach(&sb, NULL));
+               }
+
+               if (option_required_reference.nr &&
+                   option_optional_reference.nr)
+                       die(_("clone --recursive is not compatible with "
+                             "both --reference and --reference-if-able"));
+               else if (option_required_reference.nr) {
+                       string_list_append(&option_config,
+                               "submodule.alternateLocation=superproject");
+                       string_list_append(&option_config,
+                               "submodule.alternateErrorStrategy=die");
+               } else if (option_optional_reference.nr) {
+                       string_list_append(&option_config,
+                               "submodule.alternateLocation=superproject");
+                       string_list_append(&option_config,
+                               "submodule.alternateErrorStrategy=info");
+               }
+       }
+
+       init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
+
+       if (real_git_dir)
+               git_dir = real_git_dir;
+
        write_config(&option_config);
 
        git_config(git_default_config, NULL);
@@ -883,13 +1045,15 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
        git_config_set(key.buf, repo);
        strbuf_reset(&key);
 
-       if (option_reference.nr)
-               setup_reference();
-       else if (option_dissociate) {
-               warning(_("--dissociate given, but there is no --reference"));
-               option_dissociate = 0;
+       if (option_no_tags) {
+               strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
+               git_config_set(key.buf, "--no-tags");
+               strbuf_reset(&key);
        }
 
+       if (option_required_reference.nr || option_optional_reference.nr)
+               setup_reference();
+
        fetch_pattern = value.buf;
        refspec = parse_fetch_refspec(1, &fetch_pattern);
 
@@ -898,12 +1062,17 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
        remote = remote_get(option_origin);
        transport = transport_get(remote, remote->url[0]);
        transport_set_verbosity(transport, option_verbosity, option_progress);
+       transport->family = family;
 
        path = get_repo_path(remote->url[0], &is_bundle);
        is_local = option_local != 0 && path && !is_bundle;
        if (is_local) {
                if (option_depth)
                        warning(_("--depth is ignored in local clones; use file:// instead."));
+               if (option_since)
+                       warning(_("--shallow-since is ignored in local clones; use file:// instead."));
+               if (option_not.nr)
+                       warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
                if (!access(mkpath("%s/shallow", path), F_OK)) {
                        if (option_local > 0)
                                warning(_("source repository is shallow, ignoring --local"));
@@ -914,14 +1083,17 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
                warning(_("--local is ignored"));
        transport->cloning = 1;
 
-       if (!transport->get_refs_list || (!is_local && !transport->fetch))
-               die(_("Don't know how to clone %s"), transport->url);
-
        transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 
        if (option_depth)
                transport_set_option(transport, TRANS_OPT_DEPTH,
                                     option_depth);
+       if (option_since)
+               transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
+                                    option_since);
+       if (option_not.nr)
+               transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
+                                    (const char *)&option_not);
        if (option_single_branch)
                transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 
@@ -929,7 +1101,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
                transport_set_option(transport, TRANS_OPT_UPLOADPACK,
                                     option_upload_pack);
 
-       if (transport->smart_options && !option_depth)
+       if (transport->smart_options && !deepen)
                transport->smart_options->check_self_contained_and_connected = 1;
 
        refs = transport_get_remote_refs(transport);
@@ -947,7 +1119,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
                 * remote HEAD check.
                 */
                for (ref = refs; ref; ref = ref->next)
-                       if (is_null_sha1(ref->old_sha1)) {
+                       if (is_null_oid(&ref->old_oid)) {
                                complete_refs_before_fetch = 0;
                                break;
                        }
@@ -999,14 +1171,24 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 
        update_head(our_head_points_at, remote_head, reflog_msg.buf);
 
+       /*
+        * We want to show progress for recursive submodule clones iff
+        * we did so for the main clone. But only the transport knows
+        * the final decision for this flag, so we need to rescue the value
+        * before we free the transport.
+        */
+       submodule_progress = transport->progress;
+
        transport_unlock_pack(transport);
        transport_disconnect(transport);
 
-       if (option_dissociate)
+       if (option_dissociate) {
+               close_all_packs();
                dissociate_from_references();
+       }
 
        junk_mode = JUNK_LEAVE_REPO;
-       err = checkout();
+       err = checkout(submodule_progress);
 
        strbuf_release(&reflog_msg);
        strbuf_release(&branch_top);