Merge branch 'tr/push-no-verify-doc' into maint
[git] / builtin / clone.c
1 /*
2  * Builtin "git clone"
3  *
4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
7  *
8  * Clone a repository into a different directory that does not yet exist.
9  */
10
11 #include "builtin.h"
12 #include "parse-options.h"
13 #include "fetch-pack.h"
14 #include "refs.h"
15 #include "tree.h"
16 #include "tree-walk.h"
17 #include "unpack-trees.h"
18 #include "transport.h"
19 #include "strbuf.h"
20 #include "dir.h"
21 #include "pack-refs.h"
22 #include "sigchain.h"
23 #include "branch.h"
24 #include "remote.h"
25 #include "run-command.h"
26 #include "connected.h"
27
28 /*
29  * Overall FIXMEs:
30  *  - respect DB_ENVIRONMENT for .git/objects.
31  *
32  * Implementation notes:
33  *  - dropping use-separate-remote and no-separate-remote compatibility
34  *
35  */
36 static const char * const builtin_clone_usage[] = {
37         N_("git clone [options] [--] <repo> [<dir>]"),
38         NULL
39 };
40
41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
43 static char *option_template, *option_depth;
44 static char *option_origin = NULL;
45 static char *option_branch = NULL;
46 static const char *real_git_dir;
47 static char *option_upload_pack = "git-upload-pack";
48 static int option_verbosity;
49 static int option_progress = -1;
50 static struct string_list option_config;
51 static struct string_list option_reference;
52
53 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
54 {
55         struct string_list *option_reference = opt->value;
56         if (!arg)
57                 return -1;
58         string_list_append(option_reference, arg);
59         return 0;
60 }
61
62 static struct option builtin_clone_options[] = {
63         OPT__VERBOSITY(&option_verbosity),
64         OPT_BOOL(0, "progress", &option_progress,
65                  N_("force progress reporting")),
66         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
67                     N_("don't create a checkout")),
68         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
69         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
70                 N_("create a bare repository"),
71                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
72         OPT_BOOLEAN(0, "mirror", &option_mirror,
73                     N_("create a mirror repository (implies bare)")),
74         OPT_BOOL('l', "local", &option_local,
75                 N_("to clone from a local repository")),
76         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
77                     N_("don't use local hardlinks, always copy")),
78         OPT_BOOLEAN('s', "shared", &option_shared,
79                     N_("setup as shared repository")),
80         OPT_BOOLEAN(0, "recursive", &option_recursive,
81                     N_("initialize submodules in the clone")),
82         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
83                     N_("initialize submodules in the clone")),
84         OPT_STRING(0, "template", &option_template, N_("template-directory"),
85                    N_("directory from which templates will be used")),
86         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
87                      N_("reference repository"), &opt_parse_reference),
88         OPT_STRING('o', "origin", &option_origin, N_("name"),
89                    N_("use <name> instead of 'origin' to track upstream")),
90         OPT_STRING('b', "branch", &option_branch, N_("branch"),
91                    N_("checkout <branch> instead of the remote's HEAD")),
92         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
93                    N_("path to git-upload-pack on the remote")),
94         OPT_STRING(0, "depth", &option_depth, N_("depth"),
95                     N_("create a shallow clone of that depth")),
96         OPT_BOOL(0, "single-branch", &option_single_branch,
97                     N_("clone only one branch, HEAD or --branch")),
98         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
99                    N_("separate git dir from working tree")),
100         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
101                         N_("set config inside the new repository")),
102         OPT_END()
103 };
104
105 static const char *argv_submodule[] = {
106         "submodule", "update", "--init", "--recursive", NULL
107 };
108
109 static char *get_repo_path(const char *repo, int *is_bundle)
110 {
111         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
112         static char *bundle_suffix[] = { ".bundle", "" };
113         struct stat st;
114         int i;
115
116         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
117                 const char *path;
118                 path = mkpath("%s%s", repo, suffix[i]);
119                 if (stat(path, &st))
120                         continue;
121                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
122                         *is_bundle = 0;
123                         return xstrdup(absolute_path(path));
124                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
125                         /* Is it a "gitfile"? */
126                         char signature[8];
127                         int len, fd = open(path, O_RDONLY);
128                         if (fd < 0)
129                                 continue;
130                         len = read_in_full(fd, signature, 8);
131                         close(fd);
132                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
133                                 continue;
134                         path = read_gitfile(path);
135                         if (path) {
136                                 *is_bundle = 0;
137                                 return xstrdup(absolute_path(path));
138                         }
139                 }
140         }
141
142         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
143                 const char *path;
144                 path = mkpath("%s%s", repo, bundle_suffix[i]);
145                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
146                         *is_bundle = 1;
147                         return xstrdup(absolute_path(path));
148                 }
149         }
150
151         return NULL;
152 }
153
154 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
155 {
156         const char *end = repo + strlen(repo), *start;
157         char *dir;
158
159         /*
160          * Strip trailing spaces, slashes and /.git
161          */
162         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
163                 end--;
164         if (end - repo > 5 && is_dir_sep(end[-5]) &&
165             !strncmp(end - 4, ".git", 4)) {
166                 end -= 5;
167                 while (repo < end && is_dir_sep(end[-1]))
168                         end--;
169         }
170
171         /*
172          * Find last component, but be prepared that repo could have
173          * the form  "remote.example.com:foo.git", i.e. no slash
174          * in the directory part.
175          */
176         start = end;
177         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
178                 start--;
179
180         /*
181          * Strip .{bundle,git}.
182          */
183         if (is_bundle) {
184                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
185                         end -= 7;
186         } else {
187                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
188                         end -= 4;
189         }
190
191         if (is_bare) {
192                 struct strbuf result = STRBUF_INIT;
193                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
194                 dir = strbuf_detach(&result, NULL);
195         } else
196                 dir = xstrndup(start, end - start);
197         /*
198          * Replace sequences of 'control' characters and whitespace
199          * with one ascii space, remove leading and trailing spaces.
200          */
201         if (*dir) {
202                 char *out = dir;
203                 int prev_space = 1 /* strip leading whitespace */;
204                 for (end = dir; *end; ++end) {
205                         char ch = *end;
206                         if ((unsigned char)ch < '\x20')
207                                 ch = '\x20';
208                         if (isspace(ch)) {
209                                 if (prev_space)
210                                         continue;
211                                 prev_space = 1;
212                         } else
213                                 prev_space = 0;
214                         *out++ = ch;
215                 }
216                 *out = '\0';
217                 if (out > dir && prev_space)
218                         out[-1] = '\0';
219         }
220         return dir;
221 }
222
223 static void strip_trailing_slashes(char *dir)
224 {
225         char *end = dir + strlen(dir);
226
227         while (dir < end - 1 && is_dir_sep(end[-1]))
228                 end--;
229         *end = '\0';
230 }
231
232 static int add_one_reference(struct string_list_item *item, void *cb_data)
233 {
234         char *ref_git;
235         const char *repo;
236         struct strbuf alternate = STRBUF_INIT;
237
238         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
239         ref_git = xstrdup(real_path(item->string));
240
241         repo = read_gitfile(ref_git);
242         if (!repo)
243                 repo = read_gitfile(mkpath("%s/.git", ref_git));
244         if (repo) {
245                 free(ref_git);
246                 ref_git = xstrdup(repo);
247         }
248
249         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
250                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
251                 free(ref_git);
252                 ref_git = ref_git_git;
253         } else if (!is_directory(mkpath("%s/objects", ref_git)))
254                 die(_("reference repository '%s' is not a local repository."),
255                     item->string);
256
257         strbuf_addf(&alternate, "%s/objects", ref_git);
258         add_to_alternates_file(alternate.buf);
259         strbuf_release(&alternate);
260         free(ref_git);
261         return 0;
262 }
263
264 static void setup_reference(void)
265 {
266         for_each_string_list(&option_reference, add_one_reference, NULL);
267 }
268
269 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
270                             const char *src_repo)
271 {
272         /*
273          * Read from the source objects/info/alternates file
274          * and copy the entries to corresponding file in the
275          * destination repository with add_to_alternates_file().
276          * Both src and dst have "$path/objects/info/alternates".
277          *
278          * Instead of copying bit-for-bit from the original,
279          * we need to append to existing one so that the already
280          * created entry via "clone -s" is not lost, and also
281          * to turn entries with paths relative to the original
282          * absolute, so that they can be used in the new repository.
283          */
284         FILE *in = fopen(src->buf, "r");
285         struct strbuf line = STRBUF_INIT;
286
287         while (strbuf_getline(&line, in, '\n') != EOF) {
288                 char *abs_path, abs_buf[PATH_MAX];
289                 if (!line.len || line.buf[0] == '#')
290                         continue;
291                 if (is_absolute_path(line.buf)) {
292                         add_to_alternates_file(line.buf);
293                         continue;
294                 }
295                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
296                 normalize_path_copy(abs_buf, abs_path);
297                 add_to_alternates_file(abs_buf);
298         }
299         strbuf_release(&line);
300         fclose(in);
301 }
302
303 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
304                                    const char *src_repo, int src_baselen)
305 {
306         struct dirent *de;
307         struct stat buf;
308         int src_len, dest_len;
309         DIR *dir;
310
311         dir = opendir(src->buf);
312         if (!dir)
313                 die_errno(_("failed to open '%s'"), src->buf);
314
315         if (mkdir(dest->buf, 0777)) {
316                 if (errno != EEXIST)
317                         die_errno(_("failed to create directory '%s'"), dest->buf);
318                 else if (stat(dest->buf, &buf))
319                         die_errno(_("failed to stat '%s'"), dest->buf);
320                 else if (!S_ISDIR(buf.st_mode))
321                         die(_("%s exists and is not a directory"), dest->buf);
322         }
323
324         strbuf_addch(src, '/');
325         src_len = src->len;
326         strbuf_addch(dest, '/');
327         dest_len = dest->len;
328
329         while ((de = readdir(dir)) != NULL) {
330                 strbuf_setlen(src, src_len);
331                 strbuf_addstr(src, de->d_name);
332                 strbuf_setlen(dest, dest_len);
333                 strbuf_addstr(dest, de->d_name);
334                 if (stat(src->buf, &buf)) {
335                         warning (_("failed to stat %s\n"), src->buf);
336                         continue;
337                 }
338                 if (S_ISDIR(buf.st_mode)) {
339                         if (de->d_name[0] != '.')
340                                 copy_or_link_directory(src, dest,
341                                                        src_repo, src_baselen);
342                         continue;
343                 }
344
345                 /* Files that cannot be copied bit-for-bit... */
346                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
347                         copy_alternates(src, dest, src_repo);
348                         continue;
349                 }
350
351                 if (unlink(dest->buf) && errno != ENOENT)
352                         die_errno(_("failed to unlink '%s'"), dest->buf);
353                 if (!option_no_hardlinks) {
354                         if (!link(src->buf, dest->buf))
355                                 continue;
356                         if (option_local > 0)
357                                 die_errno(_("failed to create link '%s'"), dest->buf);
358                         option_no_hardlinks = 1;
359                 }
360                 if (copy_file_with_time(dest->buf, src->buf, 0666))
361                         die_errno(_("failed to copy file to '%s'"), dest->buf);
362         }
363         closedir(dir);
364 }
365
366 static void clone_local(const char *src_repo, const char *dest_repo)
367 {
368         if (option_shared) {
369                 struct strbuf alt = STRBUF_INIT;
370                 strbuf_addf(&alt, "%s/objects", src_repo);
371                 add_to_alternates_file(alt.buf);
372                 strbuf_release(&alt);
373         } else {
374                 struct strbuf src = STRBUF_INIT;
375                 struct strbuf dest = STRBUF_INIT;
376                 strbuf_addf(&src, "%s/objects", src_repo);
377                 strbuf_addf(&dest, "%s/objects", dest_repo);
378                 copy_or_link_directory(&src, &dest, src_repo, src.len);
379                 strbuf_release(&src);
380                 strbuf_release(&dest);
381         }
382
383         if (0 <= option_verbosity)
384                 printf(_("done.\n"));
385 }
386
387 static const char *junk_work_tree;
388 static const char *junk_git_dir;
389 static pid_t junk_pid;
390 static enum {
391         JUNK_LEAVE_NONE,
392         JUNK_LEAVE_REPO,
393         JUNK_LEAVE_ALL
394 } junk_mode = JUNK_LEAVE_NONE;
395
396 static const char junk_leave_repo_msg[] =
397 N_("Clone succeeded, but checkout failed.\n"
398    "You can inspect what was checked out with 'git status'\n"
399    "and retry the checkout with 'git checkout -f HEAD'\n");
400
401 static void remove_junk(void)
402 {
403         struct strbuf sb = STRBUF_INIT;
404
405         switch (junk_mode) {
406         case JUNK_LEAVE_REPO:
407                 warning("%s", _(junk_leave_repo_msg));
408                 /* fall-through */
409         case JUNK_LEAVE_ALL:
410                 return;
411         default:
412                 /* proceed to removal */
413                 break;
414         }
415
416         if (getpid() != junk_pid)
417                 return;
418         if (junk_git_dir) {
419                 strbuf_addstr(&sb, junk_git_dir);
420                 remove_dir_recursively(&sb, 0);
421                 strbuf_reset(&sb);
422         }
423         if (junk_work_tree) {
424                 strbuf_addstr(&sb, junk_work_tree);
425                 remove_dir_recursively(&sb, 0);
426                 strbuf_reset(&sb);
427         }
428 }
429
430 static void remove_junk_on_signal(int signo)
431 {
432         remove_junk();
433         sigchain_pop(signo);
434         raise(signo);
435 }
436
437 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
438 {
439         struct ref *ref;
440         struct strbuf head = STRBUF_INIT;
441         strbuf_addstr(&head, "refs/heads/");
442         strbuf_addstr(&head, branch);
443         ref = find_ref_by_name(refs, head.buf);
444         strbuf_release(&head);
445
446         if (ref)
447                 return ref;
448
449         strbuf_addstr(&head, "refs/tags/");
450         strbuf_addstr(&head, branch);
451         ref = find_ref_by_name(refs, head.buf);
452         strbuf_release(&head);
453
454         return ref;
455 }
456
457 static struct ref *wanted_peer_refs(const struct ref *refs,
458                 struct refspec *refspec)
459 {
460         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
461         struct ref *local_refs = head;
462         struct ref **tail = head ? &head->next : &local_refs;
463
464         if (option_single_branch) {
465                 struct ref *remote_head = NULL;
466
467                 if (!option_branch)
468                         remote_head = guess_remote_head(head, refs, 0);
469                 else {
470                         local_refs = NULL;
471                         tail = &local_refs;
472                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
473                 }
474
475                 if (!remote_head && option_branch)
476                         warning(_("Could not find remote branch %s to clone."),
477                                 option_branch);
478                 else {
479                         get_fetch_map(remote_head, refspec, &tail, 0);
480
481                         /* if --branch=tag, pull the requested tag explicitly */
482                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
483                 }
484         } else
485                 get_fetch_map(refs, refspec, &tail, 0);
486
487         if (!option_mirror && !option_single_branch)
488                 get_fetch_map(refs, tag_refspec, &tail, 0);
489
490         return local_refs;
491 }
492
493 static void write_remote_refs(const struct ref *local_refs)
494 {
495         const struct ref *r;
496
497         for (r = local_refs; r; r = r->next) {
498                 if (!r->peer_ref)
499                         continue;
500                 add_packed_ref(r->peer_ref->name, r->old_sha1);
501         }
502
503         pack_refs(PACK_REFS_ALL);
504 }
505
506 static void write_followtags(const struct ref *refs, const char *msg)
507 {
508         const struct ref *ref;
509         for (ref = refs; ref; ref = ref->next) {
510                 if (prefixcmp(ref->name, "refs/tags/"))
511                         continue;
512                 if (!suffixcmp(ref->name, "^{}"))
513                         continue;
514                 if (!has_sha1_file(ref->old_sha1))
515                         continue;
516                 update_ref(msg, ref->name, ref->old_sha1,
517                            NULL, 0, DIE_ON_ERR);
518         }
519 }
520
521 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
522 {
523         struct ref **rm = cb_data;
524         struct ref *ref = *rm;
525
526         /*
527          * Skip anything missing a peer_ref, which we are not
528          * actually going to write a ref for.
529          */
530         while (ref && !ref->peer_ref)
531                 ref = ref->next;
532         /* Returning -1 notes "end of list" to the caller. */
533         if (!ref)
534                 return -1;
535
536         hashcpy(sha1, ref->old_sha1);
537         *rm = ref->next;
538         return 0;
539 }
540
541 static void update_remote_refs(const struct ref *refs,
542                                const struct ref *mapped_refs,
543                                const struct ref *remote_head_points_at,
544                                const char *branch_top,
545                                const char *msg)
546 {
547         const struct ref *rm = mapped_refs;
548
549         if (check_everything_connected(iterate_ref_map, 0, &rm))
550                 die(_("remote did not send all necessary objects"));
551
552         if (refs) {
553                 write_remote_refs(mapped_refs);
554                 if (option_single_branch)
555                         write_followtags(refs, msg);
556         }
557
558         if (remote_head_points_at && !option_bare) {
559                 struct strbuf head_ref = STRBUF_INIT;
560                 strbuf_addstr(&head_ref, branch_top);
561                 strbuf_addstr(&head_ref, "HEAD");
562                 create_symref(head_ref.buf,
563                               remote_head_points_at->peer_ref->name,
564                               msg);
565         }
566 }
567
568 static void update_head(const struct ref *our, const struct ref *remote,
569                         const char *msg)
570 {
571         if (our && !prefixcmp(our->name, "refs/heads/")) {
572                 /* Local default branch link */
573                 create_symref("HEAD", our->name, NULL);
574                 if (!option_bare) {
575                         const char *head = skip_prefix(our->name, "refs/heads/");
576                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
577                         install_branch_config(0, head, option_origin, our->name);
578                 }
579         } else if (our) {
580                 struct commit *c = lookup_commit_reference(our->old_sha1);
581                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
582                 update_ref(msg, "HEAD", c->object.sha1,
583                            NULL, REF_NODEREF, DIE_ON_ERR);
584         } else if (remote) {
585                 /*
586                  * We know remote HEAD points to a non-branch, or
587                  * HEAD points to a branch but we don't know which one.
588                  * Detach HEAD in all these cases.
589                  */
590                 update_ref(msg, "HEAD", remote->old_sha1,
591                            NULL, REF_NODEREF, DIE_ON_ERR);
592         }
593 }
594
595 static int checkout(void)
596 {
597         unsigned char sha1[20];
598         char *head;
599         struct lock_file *lock_file;
600         struct unpack_trees_options opts;
601         struct tree *tree;
602         struct tree_desc t;
603         int err = 0, fd;
604
605         if (option_no_checkout)
606                 return 0;
607
608         head = resolve_refdup("HEAD", sha1, 1, NULL);
609         if (!head) {
610                 warning(_("remote HEAD refers to nonexistent ref, "
611                           "unable to checkout.\n"));
612                 return 0;
613         }
614         if (!strcmp(head, "HEAD")) {
615                 if (advice_detached_head)
616                         detach_advice(sha1_to_hex(sha1));
617         } else {
618                 if (prefixcmp(head, "refs/heads/"))
619                         die(_("HEAD not found below refs/heads!"));
620         }
621         free(head);
622
623         /* We need to be in the new work tree for the checkout */
624         setup_work_tree();
625
626         lock_file = xcalloc(1, sizeof(struct lock_file));
627         fd = hold_locked_index(lock_file, 1);
628
629         memset(&opts, 0, sizeof opts);
630         opts.update = 1;
631         opts.merge = 1;
632         opts.fn = oneway_merge;
633         opts.verbose_update = (option_verbosity >= 0);
634         opts.src_index = &the_index;
635         opts.dst_index = &the_index;
636
637         tree = parse_tree_indirect(sha1);
638         parse_tree(tree);
639         init_tree_desc(&t, tree->buffer, tree->size);
640         if (unpack_trees(1, &t, &opts) < 0)
641                 die(_("unable to checkout working tree"));
642
643         if (write_cache(fd, active_cache, active_nr) ||
644             commit_locked_index(lock_file))
645                 die(_("unable to write new index file"));
646
647         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
648                         sha1_to_hex(sha1), "1", NULL);
649
650         if (!err && option_recursive)
651                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
652
653         return err;
654 }
655
656 static int write_one_config(const char *key, const char *value, void *data)
657 {
658         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
659 }
660
661 static void write_config(struct string_list *config)
662 {
663         int i;
664
665         for (i = 0; i < config->nr; i++) {
666                 if (git_config_parse_parameter(config->items[i].string,
667                                                write_one_config, NULL) < 0)
668                         die("unable to write parameters to config file");
669         }
670 }
671
672 static void write_refspec_config(const char* src_ref_prefix,
673                 const struct ref* our_head_points_at,
674                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
675 {
676         struct strbuf key = STRBUF_INIT;
677         struct strbuf value = STRBUF_INIT;
678
679         if (option_mirror || !option_bare) {
680                 if (option_single_branch && !option_mirror) {
681                         if (option_branch) {
682                                 if (strstr(our_head_points_at->name, "refs/tags/"))
683                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
684                                                 our_head_points_at->name);
685                                 else
686                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
687                                                 branch_top->buf, option_branch);
688                         } else if (remote_head_points_at) {
689                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
690                                                 branch_top->buf,
691                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
692                         }
693                         /*
694                          * otherwise, the next "git fetch" will
695                          * simply fetch from HEAD without updating
696                          * any remote tracking branch, which is what
697                          * we want.
698                          */
699                 } else {
700                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
701                 }
702                 /* Configure the remote */
703                 if (value.len) {
704                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
705                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
706                         strbuf_reset(&key);
707
708                         if (option_mirror) {
709                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
710                                 git_config_set(key.buf, "true");
711                                 strbuf_reset(&key);
712                         }
713                 }
714         }
715
716         strbuf_release(&key);
717         strbuf_release(&value);
718 }
719
720 int cmd_clone(int argc, const char **argv, const char *prefix)
721 {
722         int is_bundle = 0, is_local;
723         struct stat buf;
724         const char *repo_name, *repo, *work_tree, *git_dir;
725         char *path, *dir;
726         int dest_exists;
727         const struct ref *refs, *remote_head;
728         const struct ref *remote_head_points_at;
729         const struct ref *our_head_points_at;
730         struct ref *mapped_refs;
731         const struct ref *ref;
732         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
733         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
734         struct transport *transport = NULL;
735         const char *src_ref_prefix = "refs/heads/";
736         struct remote *remote;
737         int err = 0, complete_refs_before_fetch = 1;
738
739         struct refspec *refspec;
740         const char *fetch_pattern;
741
742         junk_pid = getpid();
743
744         packet_trace_identity("clone");
745         argc = parse_options(argc, argv, prefix, builtin_clone_options,
746                              builtin_clone_usage, 0);
747
748         if (argc > 2)
749                 usage_msg_opt(_("Too many arguments."),
750                         builtin_clone_usage, builtin_clone_options);
751
752         if (argc == 0)
753                 usage_msg_opt(_("You must specify a repository to clone."),
754                         builtin_clone_usage, builtin_clone_options);
755
756         if (option_single_branch == -1)
757                 option_single_branch = option_depth ? 1 : 0;
758
759         if (option_mirror)
760                 option_bare = 1;
761
762         if (option_bare) {
763                 if (option_origin)
764                         die(_("--bare and --origin %s options are incompatible."),
765                             option_origin);
766                 if (real_git_dir)
767                         die(_("--bare and --separate-git-dir are incompatible."));
768                 option_no_checkout = 1;
769         }
770
771         if (!option_origin)
772                 option_origin = "origin";
773
774         repo_name = argv[0];
775
776         path = get_repo_path(repo_name, &is_bundle);
777         if (path)
778                 repo = xstrdup(absolute_path(repo_name));
779         else if (!strchr(repo_name, ':'))
780                 die(_("repository '%s' does not exist"), repo_name);
781         else
782                 repo = repo_name;
783         is_local = option_local != 0 && path && !is_bundle;
784         if (is_local && option_depth)
785                 warning(_("--depth is ignored in local clones; use file:// instead."));
786
787         if (argc == 2)
788                 dir = xstrdup(argv[1]);
789         else
790                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
791         strip_trailing_slashes(dir);
792
793         dest_exists = !stat(dir, &buf);
794         if (dest_exists && !is_empty_dir(dir))
795                 die(_("destination path '%s' already exists and is not "
796                         "an empty directory."), dir);
797
798         strbuf_addf(&reflog_msg, "clone: from %s", repo);
799
800         if (option_bare)
801                 work_tree = NULL;
802         else {
803                 work_tree = getenv("GIT_WORK_TREE");
804                 if (work_tree && !stat(work_tree, &buf))
805                         die(_("working tree '%s' already exists."), work_tree);
806         }
807
808         if (option_bare || work_tree)
809                 git_dir = xstrdup(dir);
810         else {
811                 work_tree = dir;
812                 git_dir = mkpathdup("%s/.git", dir);
813         }
814
815         if (!option_bare) {
816                 junk_work_tree = work_tree;
817                 if (safe_create_leading_directories_const(work_tree) < 0)
818                         die_errno(_("could not create leading directories of '%s'"),
819                                   work_tree);
820                 if (!dest_exists && mkdir(work_tree, 0777))
821                         die_errno(_("could not create work tree dir '%s'."),
822                                   work_tree);
823                 set_git_work_tree(work_tree);
824         }
825         junk_git_dir = git_dir;
826         atexit(remove_junk);
827         sigchain_push_common(remove_junk_on_signal);
828
829         if (safe_create_leading_directories_const(git_dir) < 0)
830                 die(_("could not create leading directories of '%s'"), git_dir);
831
832         set_git_dir_init(git_dir, real_git_dir, 0);
833         if (real_git_dir) {
834                 git_dir = real_git_dir;
835                 junk_git_dir = real_git_dir;
836         }
837
838         if (0 <= option_verbosity) {
839                 if (option_bare)
840                         printf(_("Cloning into bare repository '%s'...\n"), dir);
841                 else
842                         printf(_("Cloning into '%s'...\n"), dir);
843         }
844         init_db(option_template, INIT_DB_QUIET);
845         write_config(&option_config);
846
847         git_config(git_default_config, NULL);
848
849         if (option_bare) {
850                 if (option_mirror)
851                         src_ref_prefix = "refs/";
852                 strbuf_addstr(&branch_top, src_ref_prefix);
853
854                 git_config_set("core.bare", "true");
855         } else {
856                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
857         }
858
859         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
860         strbuf_addf(&key, "remote.%s.url", option_origin);
861         git_config_set(key.buf, repo);
862         strbuf_reset(&key);
863
864         if (option_reference.nr)
865                 setup_reference();
866
867         fetch_pattern = value.buf;
868         refspec = parse_fetch_refspec(1, &fetch_pattern);
869
870         strbuf_reset(&value);
871
872         remote = remote_get(option_origin);
873         transport = transport_get(remote, remote->url[0]);
874
875         if (!is_local) {
876                 if (!transport->get_refs_list || !transport->fetch)
877                         die(_("Don't know how to clone %s"), transport->url);
878
879                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
880
881                 if (option_depth)
882                         transport_set_option(transport, TRANS_OPT_DEPTH,
883                                              option_depth);
884                 if (option_single_branch)
885                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
886
887                 transport_set_verbosity(transport, option_verbosity, option_progress);
888
889                 if (option_upload_pack)
890                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
891                                              option_upload_pack);
892         }
893
894         refs = transport_get_remote_refs(transport);
895
896         if (refs) {
897                 mapped_refs = wanted_peer_refs(refs, refspec);
898                 /*
899                  * transport_get_remote_refs() may return refs with null sha-1
900                  * in mapped_refs (see struct transport->get_refs_list
901                  * comment). In that case we need fetch it early because
902                  * remote_head code below relies on it.
903                  *
904                  * for normal clones, transport_get_remote_refs() should
905                  * return reliable ref set, we can delay cloning until after
906                  * remote HEAD check.
907                  */
908                 for (ref = refs; ref; ref = ref->next)
909                         if (is_null_sha1(ref->old_sha1)) {
910                                 complete_refs_before_fetch = 0;
911                                 break;
912                         }
913
914                 if (!is_local && !complete_refs_before_fetch)
915                         transport_fetch_refs(transport, mapped_refs);
916
917                 remote_head = find_ref_by_name(refs, "HEAD");
918                 remote_head_points_at =
919                         guess_remote_head(remote_head, mapped_refs, 0);
920
921                 if (option_branch) {
922                         our_head_points_at =
923                                 find_remote_branch(mapped_refs, option_branch);
924
925                         if (!our_head_points_at)
926                                 die(_("Remote branch %s not found in upstream %s"),
927                                     option_branch, option_origin);
928                 }
929                 else
930                         our_head_points_at = remote_head_points_at;
931         }
932         else {
933                 warning(_("You appear to have cloned an empty repository."));
934                 mapped_refs = NULL;
935                 our_head_points_at = NULL;
936                 remote_head_points_at = NULL;
937                 remote_head = NULL;
938                 option_no_checkout = 1;
939                 if (!option_bare)
940                         install_branch_config(0, "master", option_origin,
941                                               "refs/heads/master");
942         }
943
944         write_refspec_config(src_ref_prefix, our_head_points_at,
945                         remote_head_points_at, &branch_top);
946
947         if (is_local)
948                 clone_local(path, git_dir);
949         else if (refs && complete_refs_before_fetch)
950                 transport_fetch_refs(transport, mapped_refs);
951
952         update_remote_refs(refs, mapped_refs, remote_head_points_at,
953                            branch_top.buf, reflog_msg.buf);
954
955         update_head(our_head_points_at, remote_head, reflog_msg.buf);
956
957         transport_unlock_pack(transport);
958         transport_disconnect(transport);
959
960         junk_mode = JUNK_LEAVE_REPO;
961         err = checkout();
962
963         strbuf_release(&reflog_msg);
964         strbuf_release(&branch_top);
965         strbuf_release(&key);
966         strbuf_release(&value);
967         junk_mode = JUNK_LEAVE_ALL;
968         return err;
969 }