Merge branch 'fk/doc-format-patch-vn'
[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 "lockfile.h"
13 #include "parse-options.h"
14 #include "fetch-pack.h"
15 #include "refs.h"
16 #include "tree.h"
17 #include "tree-walk.h"
18 #include "unpack-trees.h"
19 #include "transport.h"
20 #include "strbuf.h"
21 #include "dir.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 static int option_dissociate;
53
54 static struct option builtin_clone_options[] = {
55         OPT__VERBOSITY(&option_verbosity),
56         OPT_BOOL(0, "progress", &option_progress,
57                  N_("force progress reporting")),
58         OPT_BOOL('n', "no-checkout", &option_no_checkout,
59                  N_("don't create a checkout")),
60         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
61         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
62                         N_("create a bare repository")),
63         OPT_BOOL(0, "mirror", &option_mirror,
64                  N_("create a mirror repository (implies bare)")),
65         OPT_BOOL('l', "local", &option_local,
66                 N_("to clone from a local repository")),
67         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
68                     N_("don't use local hardlinks, always copy")),
69         OPT_BOOL('s', "shared", &option_shared,
70                     N_("setup as shared repository")),
71         OPT_BOOL(0, "recursive", &option_recursive,
72                     N_("initialize submodules in the clone")),
73         OPT_BOOL(0, "recurse-submodules", &option_recursive,
74                     N_("initialize submodules in the clone")),
75         OPT_STRING(0, "template", &option_template, N_("template-directory"),
76                    N_("directory from which templates will be used")),
77         OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
78                         N_("reference repository")),
79         OPT_BOOL(0, "dissociate", &option_dissociate,
80                  N_("use --reference only while cloning")),
81         OPT_STRING('o', "origin", &option_origin, N_("name"),
82                    N_("use <name> instead of 'origin' to track upstream")),
83         OPT_STRING('b', "branch", &option_branch, N_("branch"),
84                    N_("checkout <branch> instead of the remote's HEAD")),
85         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
86                    N_("path to git-upload-pack on the remote")),
87         OPT_STRING(0, "depth", &option_depth, N_("depth"),
88                     N_("create a shallow clone of that depth")),
89         OPT_BOOL(0, "single-branch", &option_single_branch,
90                     N_("clone only one branch, HEAD or --branch")),
91         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
92                    N_("separate git dir from working tree")),
93         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
94                         N_("set config inside the new repository")),
95         OPT_END()
96 };
97
98 static const char *argv_submodule[] = {
99         "submodule", "update", "--init", "--recursive", NULL
100 };
101
102 static char *get_repo_path(const char *repo, int *is_bundle)
103 {
104         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
105         static char *bundle_suffix[] = { ".bundle", "" };
106         struct stat st;
107         int i;
108
109         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
110                 const char *path;
111                 path = mkpath("%s%s", repo, suffix[i]);
112                 if (stat(path, &st))
113                         continue;
114                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
115                         *is_bundle = 0;
116                         return xstrdup(absolute_path(path));
117                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
118                         /* Is it a "gitfile"? */
119                         char signature[8];
120                         int len, fd = open(path, O_RDONLY);
121                         if (fd < 0)
122                                 continue;
123                         len = read_in_full(fd, signature, 8);
124                         close(fd);
125                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
126                                 continue;
127                         path = read_gitfile(path);
128                         if (path) {
129                                 *is_bundle = 0;
130                                 return xstrdup(absolute_path(path));
131                         }
132                 }
133         }
134
135         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
136                 const char *path;
137                 path = mkpath("%s%s", repo, bundle_suffix[i]);
138                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
139                         *is_bundle = 1;
140                         return xstrdup(absolute_path(path));
141                 }
142         }
143
144         return NULL;
145 }
146
147 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
148 {
149         const char *end = repo + strlen(repo), *start;
150         char *dir;
151
152         /*
153          * Strip trailing spaces, slashes and /.git
154          */
155         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
156                 end--;
157         if (end - repo > 5 && is_dir_sep(end[-5]) &&
158             !strncmp(end - 4, ".git", 4)) {
159                 end -= 5;
160                 while (repo < end && is_dir_sep(end[-1]))
161                         end--;
162         }
163
164         /*
165          * Find last component, but be prepared that repo could have
166          * the form  "remote.example.com:foo.git", i.e. no slash
167          * in the directory part.
168          */
169         start = end;
170         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
171                 start--;
172
173         /*
174          * Strip .{bundle,git}.
175          */
176         if (is_bundle) {
177                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
178                         end -= 7;
179         } else {
180                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
181                         end -= 4;
182         }
183
184         if (is_bare) {
185                 struct strbuf result = STRBUF_INIT;
186                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
187                 dir = strbuf_detach(&result, NULL);
188         } else
189                 dir = xstrndup(start, end - start);
190         /*
191          * Replace sequences of 'control' characters and whitespace
192          * with one ascii space, remove leading and trailing spaces.
193          */
194         if (*dir) {
195                 char *out = dir;
196                 int prev_space = 1 /* strip leading whitespace */;
197                 for (end = dir; *end; ++end) {
198                         char ch = *end;
199                         if ((unsigned char)ch < '\x20')
200                                 ch = '\x20';
201                         if (isspace(ch)) {
202                                 if (prev_space)
203                                         continue;
204                                 prev_space = 1;
205                         } else
206                                 prev_space = 0;
207                         *out++ = ch;
208                 }
209                 *out = '\0';
210                 if (out > dir && prev_space)
211                         out[-1] = '\0';
212         }
213         return dir;
214 }
215
216 static void strip_trailing_slashes(char *dir)
217 {
218         char *end = dir + strlen(dir);
219
220         while (dir < end - 1 && is_dir_sep(end[-1]))
221                 end--;
222         *end = '\0';
223 }
224
225 static int add_one_reference(struct string_list_item *item, void *cb_data)
226 {
227         char *ref_git;
228         const char *repo;
229         struct strbuf alternate = STRBUF_INIT;
230
231         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
232         ref_git = xstrdup(real_path(item->string));
233
234         repo = read_gitfile(ref_git);
235         if (!repo)
236                 repo = read_gitfile(mkpath("%s/.git", ref_git));
237         if (repo) {
238                 free(ref_git);
239                 ref_git = xstrdup(repo);
240         }
241
242         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
243                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
244                 free(ref_git);
245                 ref_git = ref_git_git;
246         } else if (!is_directory(mkpath("%s/objects", ref_git)))
247                 die(_("reference repository '%s' is not a local repository."),
248                     item->string);
249
250         if (!access(mkpath("%s/shallow", ref_git), F_OK))
251                 die(_("reference repository '%s' is shallow"), item->string);
252
253         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
254                 die(_("reference repository '%s' is grafted"), item->string);
255
256         strbuf_addf(&alternate, "%s/objects", ref_git);
257         add_to_alternates_file(alternate.buf);
258         strbuf_release(&alternate);
259         free(ref_git);
260         return 0;
261 }
262
263 static void setup_reference(void)
264 {
265         for_each_string_list(&option_reference, add_one_reference, NULL);
266 }
267
268 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
269                             const char *src_repo)
270 {
271         /*
272          * Read from the source objects/info/alternates file
273          * and copy the entries to corresponding file in the
274          * destination repository with add_to_alternates_file().
275          * Both src and dst have "$path/objects/info/alternates".
276          *
277          * Instead of copying bit-for-bit from the original,
278          * we need to append to existing one so that the already
279          * created entry via "clone -s" is not lost, and also
280          * to turn entries with paths relative to the original
281          * absolute, so that they can be used in the new repository.
282          */
283         FILE *in = fopen(src->buf, "r");
284         struct strbuf line = STRBUF_INIT;
285
286         while (strbuf_getline(&line, in, '\n') != EOF) {
287                 char *abs_path;
288                 if (!line.len || line.buf[0] == '#')
289                         continue;
290                 if (is_absolute_path(line.buf)) {
291                         add_to_alternates_file(line.buf);
292                         continue;
293                 }
294                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
295                 normalize_path_copy(abs_path, abs_path);
296                 add_to_alternates_file(abs_path);
297                 free(abs_path);
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                 fprintf(stderr, _("done.\n"));
385 }
386
387 static const char *junk_work_tree;
388 static const char *junk_git_dir;
389 static enum {
390         JUNK_LEAVE_NONE,
391         JUNK_LEAVE_REPO,
392         JUNK_LEAVE_ALL
393 } junk_mode = JUNK_LEAVE_NONE;
394
395 static const char junk_leave_repo_msg[] =
396 N_("Clone succeeded, but checkout failed.\n"
397    "You can inspect what was checked out with 'git status'\n"
398    "and retry the checkout with 'git checkout -f HEAD'\n");
399
400 static void remove_junk(void)
401 {
402         struct strbuf sb = STRBUF_INIT;
403
404         switch (junk_mode) {
405         case JUNK_LEAVE_REPO:
406                 warning("%s", _(junk_leave_repo_msg));
407                 /* fall-through */
408         case JUNK_LEAVE_ALL:
409                 return;
410         default:
411                 /* proceed to removal */
412                 break;
413         }
414
415         if (junk_git_dir) {
416                 strbuf_addstr(&sb, junk_git_dir);
417                 remove_dir_recursively(&sb, 0);
418                 strbuf_reset(&sb);
419         }
420         if (junk_work_tree) {
421                 strbuf_addstr(&sb, junk_work_tree);
422                 remove_dir_recursively(&sb, 0);
423                 strbuf_reset(&sb);
424         }
425 }
426
427 static void remove_junk_on_signal(int signo)
428 {
429         remove_junk();
430         sigchain_pop(signo);
431         raise(signo);
432 }
433
434 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
435 {
436         struct ref *ref;
437         struct strbuf head = STRBUF_INIT;
438         strbuf_addstr(&head, "refs/heads/");
439         strbuf_addstr(&head, branch);
440         ref = find_ref_by_name(refs, head.buf);
441         strbuf_release(&head);
442
443         if (ref)
444                 return ref;
445
446         strbuf_addstr(&head, "refs/tags/");
447         strbuf_addstr(&head, branch);
448         ref = find_ref_by_name(refs, head.buf);
449         strbuf_release(&head);
450
451         return ref;
452 }
453
454 static struct ref *wanted_peer_refs(const struct ref *refs,
455                 struct refspec *refspec)
456 {
457         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
458         struct ref *local_refs = head;
459         struct ref **tail = head ? &head->next : &local_refs;
460
461         if (option_single_branch) {
462                 struct ref *remote_head = NULL;
463
464                 if (!option_branch)
465                         remote_head = guess_remote_head(head, refs, 0);
466                 else {
467                         local_refs = NULL;
468                         tail = &local_refs;
469                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
470                 }
471
472                 if (!remote_head && option_branch)
473                         warning(_("Could not find remote branch %s to clone."),
474                                 option_branch);
475                 else {
476                         get_fetch_map(remote_head, refspec, &tail, 0);
477
478                         /* if --branch=tag, pull the requested tag explicitly */
479                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
480                 }
481         } else
482                 get_fetch_map(refs, refspec, &tail, 0);
483
484         if (!option_mirror && !option_single_branch)
485                 get_fetch_map(refs, tag_refspec, &tail, 0);
486
487         return local_refs;
488 }
489
490 static void write_remote_refs(const struct ref *local_refs)
491 {
492         const struct ref *r;
493
494         lock_packed_refs(LOCK_DIE_ON_ERROR);
495
496         for (r = local_refs; r; r = r->next) {
497                 if (!r->peer_ref)
498                         continue;
499                 add_packed_ref(r->peer_ref->name, r->old_sha1);
500         }
501
502         if (commit_packed_refs())
503                 die_errno("unable to overwrite old ref-pack file");
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 (!starts_with(ref->name, "refs/tags/"))
511                         continue;
512                 if (ends_with(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, UPDATE_REFS_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                                struct transport *transport,
547                                int check_connectivity)
548 {
549         const struct ref *rm = mapped_refs;
550
551         if (check_connectivity) {
552                 if (transport->progress)
553                         fprintf(stderr, _("Checking connectivity... "));
554                 if (check_everything_connected_with_transport(iterate_ref_map,
555                                                               0, &rm, transport))
556                         die(_("remote did not send all necessary objects"));
557                 if (transport->progress)
558                         fprintf(stderr, _("done.\n"));
559         }
560
561         if (refs) {
562                 write_remote_refs(mapped_refs);
563                 if (option_single_branch)
564                         write_followtags(refs, msg);
565         }
566
567         if (remote_head_points_at && !option_bare) {
568                 struct strbuf head_ref = STRBUF_INIT;
569                 strbuf_addstr(&head_ref, branch_top);
570                 strbuf_addstr(&head_ref, "HEAD");
571                 create_symref(head_ref.buf,
572                               remote_head_points_at->peer_ref->name,
573                               msg);
574         }
575 }
576
577 static void update_head(const struct ref *our, const struct ref *remote,
578                         const char *msg)
579 {
580         const char *head;
581         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
582                 /* Local default branch link */
583                 create_symref("HEAD", our->name, NULL);
584                 if (!option_bare) {
585                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
586                                    UPDATE_REFS_DIE_ON_ERR);
587                         install_branch_config(0, head, option_origin, our->name);
588                 }
589         } else if (our) {
590                 struct commit *c = lookup_commit_reference(our->old_sha1);
591                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
592                 update_ref(msg, "HEAD", c->object.sha1,
593                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
594         } else if (remote) {
595                 /*
596                  * We know remote HEAD points to a non-branch, or
597                  * HEAD points to a branch but we don't know which one.
598                  * Detach HEAD in all these cases.
599                  */
600                 update_ref(msg, "HEAD", remote->old_sha1,
601                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
602         }
603 }
604
605 static int checkout(void)
606 {
607         unsigned char sha1[20];
608         char *head;
609         struct lock_file *lock_file;
610         struct unpack_trees_options opts;
611         struct tree *tree;
612         struct tree_desc t;
613         int err = 0;
614
615         if (option_no_checkout)
616                 return 0;
617
618         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
619         if (!head) {
620                 warning(_("remote HEAD refers to nonexistent ref, "
621                           "unable to checkout.\n"));
622                 return 0;
623         }
624         if (!strcmp(head, "HEAD")) {
625                 if (advice_detached_head)
626                         detach_advice(sha1_to_hex(sha1));
627         } else {
628                 if (!starts_with(head, "refs/heads/"))
629                         die(_("HEAD not found below refs/heads!"));
630         }
631         free(head);
632
633         /* We need to be in the new work tree for the checkout */
634         setup_work_tree();
635
636         lock_file = xcalloc(1, sizeof(struct lock_file));
637         hold_locked_index(lock_file, 1);
638
639         memset(&opts, 0, sizeof opts);
640         opts.update = 1;
641         opts.merge = 1;
642         opts.fn = oneway_merge;
643         opts.verbose_update = (option_verbosity >= 0);
644         opts.src_index = &the_index;
645         opts.dst_index = &the_index;
646
647         tree = parse_tree_indirect(sha1);
648         parse_tree(tree);
649         init_tree_desc(&t, tree->buffer, tree->size);
650         if (unpack_trees(1, &t, &opts) < 0)
651                 die(_("unable to checkout working tree"));
652
653         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
654                 die(_("unable to write new index file"));
655
656         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
657                            sha1_to_hex(sha1), "1", NULL);
658
659         if (!err && option_recursive)
660                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
661
662         return err;
663 }
664
665 static int write_one_config(const char *key, const char *value, void *data)
666 {
667         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
668 }
669
670 static void write_config(struct string_list *config)
671 {
672         int i;
673
674         for (i = 0; i < config->nr; i++) {
675                 if (git_config_parse_parameter(config->items[i].string,
676                                                write_one_config, NULL) < 0)
677                         die("unable to write parameters to config file");
678         }
679 }
680
681 static void write_refspec_config(const char *src_ref_prefix,
682                 const struct ref *our_head_points_at,
683                 const struct ref *remote_head_points_at,
684                 struct strbuf *branch_top)
685 {
686         struct strbuf key = STRBUF_INIT;
687         struct strbuf value = STRBUF_INIT;
688
689         if (option_mirror || !option_bare) {
690                 if (option_single_branch && !option_mirror) {
691                         if (option_branch) {
692                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
693                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
694                                                 our_head_points_at->name);
695                                 else
696                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
697                                                 branch_top->buf, option_branch);
698                         } else if (remote_head_points_at) {
699                                 const char *head = remote_head_points_at->name;
700                                 if (!skip_prefix(head, "refs/heads/", &head))
701                                         die("BUG: remote HEAD points at non-head?");
702
703                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
704                                                 branch_top->buf, head);
705                         }
706                         /*
707                          * otherwise, the next "git fetch" will
708                          * simply fetch from HEAD without updating
709                          * any remote-tracking branch, which is what
710                          * we want.
711                          */
712                 } else {
713                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
714                 }
715                 /* Configure the remote */
716                 if (value.len) {
717                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
718                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
719                         strbuf_reset(&key);
720
721                         if (option_mirror) {
722                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
723                                 git_config_set(key.buf, "true");
724                                 strbuf_reset(&key);
725                         }
726                 }
727         }
728
729         strbuf_release(&key);
730         strbuf_release(&value);
731 }
732
733 static void dissociate_from_references(void)
734 {
735         static const char* argv[] = { "repack", "-a", "-d", NULL };
736
737         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
738                 die(_("cannot repack to clean up"));
739         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
740                 die_errno(_("cannot unlink temporary alternates file"));
741 }
742
743 int cmd_clone(int argc, const char **argv, const char *prefix)
744 {
745         int is_bundle = 0, is_local;
746         struct stat buf;
747         const char *repo_name, *repo, *work_tree, *git_dir;
748         char *path, *dir;
749         int dest_exists;
750         const struct ref *refs, *remote_head;
751         const struct ref *remote_head_points_at;
752         const struct ref *our_head_points_at;
753         struct ref *mapped_refs;
754         const struct ref *ref;
755         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
756         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
757         struct transport *transport = NULL;
758         const char *src_ref_prefix = "refs/heads/";
759         struct remote *remote;
760         int err = 0, complete_refs_before_fetch = 1;
761
762         struct refspec *refspec;
763         const char *fetch_pattern;
764
765         packet_trace_identity("clone");
766         argc = parse_options(argc, argv, prefix, builtin_clone_options,
767                              builtin_clone_usage, 0);
768
769         if (argc > 2)
770                 usage_msg_opt(_("Too many arguments."),
771                         builtin_clone_usage, builtin_clone_options);
772
773         if (argc == 0)
774                 usage_msg_opt(_("You must specify a repository to clone."),
775                         builtin_clone_usage, builtin_clone_options);
776
777         if (option_single_branch == -1)
778                 option_single_branch = option_depth ? 1 : 0;
779
780         if (option_mirror)
781                 option_bare = 1;
782
783         if (option_bare) {
784                 if (option_origin)
785                         die(_("--bare and --origin %s options are incompatible."),
786                             option_origin);
787                 if (real_git_dir)
788                         die(_("--bare and --separate-git-dir are incompatible."));
789                 option_no_checkout = 1;
790         }
791
792         if (!option_origin)
793                 option_origin = "origin";
794
795         repo_name = argv[0];
796
797         path = get_repo_path(repo_name, &is_bundle);
798         if (path)
799                 repo = xstrdup(absolute_path(repo_name));
800         else if (!strchr(repo_name, ':'))
801                 die(_("repository '%s' does not exist"), repo_name);
802         else
803                 repo = repo_name;
804
805         /* no need to be strict, transport_set_option() will validate it again */
806         if (option_depth && atoi(option_depth) < 1)
807                 die(_("depth %s is not a positive number"), option_depth);
808
809         if (argc == 2)
810                 dir = xstrdup(argv[1]);
811         else
812                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
813         strip_trailing_slashes(dir);
814
815         dest_exists = !stat(dir, &buf);
816         if (dest_exists && !is_empty_dir(dir))
817                 die(_("destination path '%s' already exists and is not "
818                         "an empty directory."), dir);
819
820         strbuf_addf(&reflog_msg, "clone: from %s", repo);
821
822         if (option_bare)
823                 work_tree = NULL;
824         else {
825                 work_tree = getenv("GIT_WORK_TREE");
826                 if (work_tree && !stat(work_tree, &buf))
827                         die(_("working tree '%s' already exists."), work_tree);
828         }
829
830         if (option_bare || work_tree)
831                 git_dir = xstrdup(dir);
832         else {
833                 work_tree = dir;
834                 git_dir = mkpathdup("%s/.git", dir);
835         }
836
837         atexit(remove_junk);
838         sigchain_push_common(remove_junk_on_signal);
839
840         if (!option_bare) {
841                 if (safe_create_leading_directories_const(work_tree) < 0)
842                         die_errno(_("could not create leading directories of '%s'"),
843                                   work_tree);
844                 if (!dest_exists && mkdir(work_tree, 0777))
845                         die_errno(_("could not create work tree dir '%s'"),
846                                   work_tree);
847                 junk_work_tree = work_tree;
848                 set_git_work_tree(work_tree);
849         }
850
851         junk_git_dir = git_dir;
852         if (safe_create_leading_directories_const(git_dir) < 0)
853                 die(_("could not create leading directories of '%s'"), git_dir);
854
855         set_git_dir_init(git_dir, real_git_dir, 0);
856         if (real_git_dir) {
857                 git_dir = real_git_dir;
858                 junk_git_dir = real_git_dir;
859         }
860
861         if (0 <= option_verbosity) {
862                 if (option_bare)
863                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
864                 else
865                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
866         }
867         init_db(option_template, INIT_DB_QUIET);
868         write_config(&option_config);
869
870         git_config(git_default_config, NULL);
871
872         if (option_bare) {
873                 if (option_mirror)
874                         src_ref_prefix = "refs/";
875                 strbuf_addstr(&branch_top, src_ref_prefix);
876
877                 git_config_set("core.bare", "true");
878         } else {
879                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
880         }
881
882         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
883         strbuf_addf(&key, "remote.%s.url", option_origin);
884         git_config_set(key.buf, repo);
885         strbuf_reset(&key);
886
887         if (option_reference.nr)
888                 setup_reference();
889         else if (option_dissociate) {
890                 warning(_("--dissociate given, but there is no --reference"));
891                 option_dissociate = 0;
892         }
893
894         fetch_pattern = value.buf;
895         refspec = parse_fetch_refspec(1, &fetch_pattern);
896
897         strbuf_reset(&value);
898
899         remote = remote_get(option_origin);
900         transport = transport_get(remote, remote->url[0]);
901         transport_set_verbosity(transport, option_verbosity, option_progress);
902
903         path = get_repo_path(remote->url[0], &is_bundle);
904         is_local = option_local != 0 && path && !is_bundle;
905         if (is_local) {
906                 if (option_depth)
907                         warning(_("--depth is ignored in local clones; use file:// instead."));
908                 if (!access(mkpath("%s/shallow", path), F_OK)) {
909                         if (option_local > 0)
910                                 warning(_("source repository is shallow, ignoring --local"));
911                         is_local = 0;
912                 }
913         }
914         if (option_local > 0 && !is_local)
915                 warning(_("--local is ignored"));
916         transport->cloning = 1;
917
918         if (!transport->get_refs_list || (!is_local && !transport->fetch))
919                 die(_("Don't know how to clone %s"), transport->url);
920
921         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
922
923         if (option_depth)
924                 transport_set_option(transport, TRANS_OPT_DEPTH,
925                                      option_depth);
926         if (option_single_branch)
927                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
928
929         if (option_upload_pack)
930                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
931                                      option_upload_pack);
932
933         if (transport->smart_options && !option_depth)
934                 transport->smart_options->check_self_contained_and_connected = 1;
935
936         refs = transport_get_remote_refs(transport);
937
938         if (refs) {
939                 mapped_refs = wanted_peer_refs(refs, refspec);
940                 /*
941                  * transport_get_remote_refs() may return refs with null sha-1
942                  * in mapped_refs (see struct transport->get_refs_list
943                  * comment). In that case we need fetch it early because
944                  * remote_head code below relies on it.
945                  *
946                  * for normal clones, transport_get_remote_refs() should
947                  * return reliable ref set, we can delay cloning until after
948                  * remote HEAD check.
949                  */
950                 for (ref = refs; ref; ref = ref->next)
951                         if (is_null_sha1(ref->old_sha1)) {
952                                 complete_refs_before_fetch = 0;
953                                 break;
954                         }
955
956                 if (!is_local && !complete_refs_before_fetch)
957                         transport_fetch_refs(transport, mapped_refs);
958
959                 remote_head = find_ref_by_name(refs, "HEAD");
960                 remote_head_points_at =
961                         guess_remote_head(remote_head, mapped_refs, 0);
962
963                 if (option_branch) {
964                         our_head_points_at =
965                                 find_remote_branch(mapped_refs, option_branch);
966
967                         if (!our_head_points_at)
968                                 die(_("Remote branch %s not found in upstream %s"),
969                                     option_branch, option_origin);
970                 }
971                 else
972                         our_head_points_at = remote_head_points_at;
973         }
974         else {
975                 if (option_branch)
976                         die(_("Remote branch %s not found in upstream %s"),
977                                         option_branch, option_origin);
978
979                 warning(_("You appear to have cloned an empty repository."));
980                 mapped_refs = NULL;
981                 our_head_points_at = NULL;
982                 remote_head_points_at = NULL;
983                 remote_head = NULL;
984                 option_no_checkout = 1;
985                 if (!option_bare)
986                         install_branch_config(0, "master", option_origin,
987                                               "refs/heads/master");
988         }
989
990         write_refspec_config(src_ref_prefix, our_head_points_at,
991                         remote_head_points_at, &branch_top);
992
993         if (is_local)
994                 clone_local(path, git_dir);
995         else if (refs && complete_refs_before_fetch)
996                 transport_fetch_refs(transport, mapped_refs);
997
998         update_remote_refs(refs, mapped_refs, remote_head_points_at,
999                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1000
1001         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1002
1003         transport_unlock_pack(transport);
1004         transport_disconnect(transport);
1005
1006         if (option_dissociate)
1007                 dissociate_from_references();
1008
1009         junk_mode = JUNK_LEAVE_REPO;
1010         err = checkout();
1011
1012         strbuf_release(&reflog_msg);
1013         strbuf_release(&branch_top);
1014         strbuf_release(&key);
1015         strbuf_release(&value);
1016         junk_mode = JUNK_LEAVE_ALL;
1017
1018         free(refspec);
1019         return err;
1020 }