templates/hooks: fix minor typo in the sample update-hook
[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         size_t len;
151         char *dir;
152
153         /*
154          * Strip trailing spaces, slashes and /.git
155          */
156         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
157                 end--;
158         if (end - repo > 5 && is_dir_sep(end[-5]) &&
159             !strncmp(end - 4, ".git", 4)) {
160                 end -= 5;
161                 while (repo < end && is_dir_sep(end[-1]))
162                         end--;
163         }
164
165         /*
166          * Find last component, but be prepared that repo could have
167          * the form  "remote.example.com:foo.git", i.e. no slash
168          * in the directory part.
169          */
170         start = end;
171         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
172                 start--;
173
174         /*
175          * Strip .{bundle,git}.
176          */
177         strip_suffix(start, is_bundle ? ".bundle" : ".git" , &len);
178
179         if (is_bare)
180                 dir = xstrfmt("%.*s.git", (int)len, start);
181         else
182                 dir = xstrndup(start, len);
183         /*
184          * Replace sequences of 'control' characters and whitespace
185          * with one ascii space, remove leading and trailing spaces.
186          */
187         if (*dir) {
188                 char *out = dir;
189                 int prev_space = 1 /* strip leading whitespace */;
190                 for (end = dir; *end; ++end) {
191                         char ch = *end;
192                         if ((unsigned char)ch < '\x20')
193                                 ch = '\x20';
194                         if (isspace(ch)) {
195                                 if (prev_space)
196                                         continue;
197                                 prev_space = 1;
198                         } else
199                                 prev_space = 0;
200                         *out++ = ch;
201                 }
202                 *out = '\0';
203                 if (out > dir && prev_space)
204                         out[-1] = '\0';
205         }
206         return dir;
207 }
208
209 static void strip_trailing_slashes(char *dir)
210 {
211         char *end = dir + strlen(dir);
212
213         while (dir < end - 1 && is_dir_sep(end[-1]))
214                 end--;
215         *end = '\0';
216 }
217
218 static int add_one_reference(struct string_list_item *item, void *cb_data)
219 {
220         char *ref_git;
221         const char *repo;
222         struct strbuf alternate = STRBUF_INIT;
223
224         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
225         ref_git = xstrdup(real_path(item->string));
226
227         repo = read_gitfile(ref_git);
228         if (!repo)
229                 repo = read_gitfile(mkpath("%s/.git", ref_git));
230         if (repo) {
231                 free(ref_git);
232                 ref_git = xstrdup(repo);
233         }
234
235         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
236                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
237                 free(ref_git);
238                 ref_git = ref_git_git;
239         } else if (!is_directory(mkpath("%s/objects", ref_git)))
240                 die(_("reference repository '%s' is not a local repository."),
241                     item->string);
242
243         if (!access(mkpath("%s/shallow", ref_git), F_OK))
244                 die(_("reference repository '%s' is shallow"), item->string);
245
246         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
247                 die(_("reference repository '%s' is grafted"), item->string);
248
249         strbuf_addf(&alternate, "%s/objects", ref_git);
250         add_to_alternates_file(alternate.buf);
251         strbuf_release(&alternate);
252         free(ref_git);
253         return 0;
254 }
255
256 static void setup_reference(void)
257 {
258         for_each_string_list(&option_reference, add_one_reference, NULL);
259 }
260
261 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
262                             const char *src_repo)
263 {
264         /*
265          * Read from the source objects/info/alternates file
266          * and copy the entries to corresponding file in the
267          * destination repository with add_to_alternates_file().
268          * Both src and dst have "$path/objects/info/alternates".
269          *
270          * Instead of copying bit-for-bit from the original,
271          * we need to append to existing one so that the already
272          * created entry via "clone -s" is not lost, and also
273          * to turn entries with paths relative to the original
274          * absolute, so that they can be used in the new repository.
275          */
276         FILE *in = fopen(src->buf, "r");
277         struct strbuf line = STRBUF_INIT;
278
279         while (strbuf_getline(&line, in, '\n') != EOF) {
280                 char *abs_path, abs_buf[PATH_MAX];
281                 if (!line.len || line.buf[0] == '#')
282                         continue;
283                 if (is_absolute_path(line.buf)) {
284                         add_to_alternates_file(line.buf);
285                         continue;
286                 }
287                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
288                 normalize_path_copy(abs_buf, abs_path);
289                 add_to_alternates_file(abs_buf);
290         }
291         strbuf_release(&line);
292         fclose(in);
293 }
294
295 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
296                                    const char *src_repo, int src_baselen)
297 {
298         struct dirent *de;
299         struct stat buf;
300         int src_len, dest_len;
301         DIR *dir;
302
303         dir = opendir(src->buf);
304         if (!dir)
305                 die_errno(_("failed to open '%s'"), src->buf);
306
307         if (mkdir(dest->buf, 0777)) {
308                 if (errno != EEXIST)
309                         die_errno(_("failed to create directory '%s'"), dest->buf);
310                 else if (stat(dest->buf, &buf))
311                         die_errno(_("failed to stat '%s'"), dest->buf);
312                 else if (!S_ISDIR(buf.st_mode))
313                         die(_("%s exists and is not a directory"), dest->buf);
314         }
315
316         strbuf_addch(src, '/');
317         src_len = src->len;
318         strbuf_addch(dest, '/');
319         dest_len = dest->len;
320
321         while ((de = readdir(dir)) != NULL) {
322                 strbuf_setlen(src, src_len);
323                 strbuf_addstr(src, de->d_name);
324                 strbuf_setlen(dest, dest_len);
325                 strbuf_addstr(dest, de->d_name);
326                 if (stat(src->buf, &buf)) {
327                         warning (_("failed to stat %s\n"), src->buf);
328                         continue;
329                 }
330                 if (S_ISDIR(buf.st_mode)) {
331                         if (de->d_name[0] != '.')
332                                 copy_or_link_directory(src, dest,
333                                                        src_repo, src_baselen);
334                         continue;
335                 }
336
337                 /* Files that cannot be copied bit-for-bit... */
338                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
339                         copy_alternates(src, dest, src_repo);
340                         continue;
341                 }
342
343                 if (unlink(dest->buf) && errno != ENOENT)
344                         die_errno(_("failed to unlink '%s'"), dest->buf);
345                 if (!option_no_hardlinks) {
346                         if (!link(src->buf, dest->buf))
347                                 continue;
348                         if (option_local > 0)
349                                 die_errno(_("failed to create link '%s'"), dest->buf);
350                         option_no_hardlinks = 1;
351                 }
352                 if (copy_file_with_time(dest->buf, src->buf, 0666))
353                         die_errno(_("failed to copy file to '%s'"), dest->buf);
354         }
355         closedir(dir);
356 }
357
358 static void clone_local(const char *src_repo, const char *dest_repo)
359 {
360         if (option_shared) {
361                 struct strbuf alt = STRBUF_INIT;
362                 strbuf_addf(&alt, "%s/objects", src_repo);
363                 add_to_alternates_file(alt.buf);
364                 strbuf_release(&alt);
365         } else {
366                 struct strbuf src = STRBUF_INIT;
367                 struct strbuf dest = STRBUF_INIT;
368                 strbuf_addf(&src, "%s/objects", src_repo);
369                 strbuf_addf(&dest, "%s/objects", dest_repo);
370                 copy_or_link_directory(&src, &dest, src_repo, src.len);
371                 strbuf_release(&src);
372                 strbuf_release(&dest);
373         }
374
375         if (0 <= option_verbosity)
376                 fprintf(stderr, _("done.\n"));
377 }
378
379 static const char *junk_work_tree;
380 static const char *junk_git_dir;
381 static enum {
382         JUNK_LEAVE_NONE,
383         JUNK_LEAVE_REPO,
384         JUNK_LEAVE_ALL
385 } junk_mode = JUNK_LEAVE_NONE;
386
387 static const char junk_leave_repo_msg[] =
388 N_("Clone succeeded, but checkout failed.\n"
389    "You can inspect what was checked out with 'git status'\n"
390    "and retry the checkout with 'git checkout -f HEAD'\n");
391
392 static void remove_junk(void)
393 {
394         struct strbuf sb = STRBUF_INIT;
395
396         switch (junk_mode) {
397         case JUNK_LEAVE_REPO:
398                 warning("%s", _(junk_leave_repo_msg));
399                 /* fall-through */
400         case JUNK_LEAVE_ALL:
401                 return;
402         default:
403                 /* proceed to removal */
404                 break;
405         }
406
407         if (junk_git_dir) {
408                 strbuf_addstr(&sb, junk_git_dir);
409                 remove_dir_recursively(&sb, 0);
410                 strbuf_reset(&sb);
411         }
412         if (junk_work_tree) {
413                 strbuf_addstr(&sb, junk_work_tree);
414                 remove_dir_recursively(&sb, 0);
415                 strbuf_reset(&sb);
416         }
417 }
418
419 static void remove_junk_on_signal(int signo)
420 {
421         remove_junk();
422         sigchain_pop(signo);
423         raise(signo);
424 }
425
426 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
427 {
428         struct ref *ref;
429         struct strbuf head = STRBUF_INIT;
430         strbuf_addstr(&head, "refs/heads/");
431         strbuf_addstr(&head, branch);
432         ref = find_ref_by_name(refs, head.buf);
433         strbuf_release(&head);
434
435         if (ref)
436                 return ref;
437
438         strbuf_addstr(&head, "refs/tags/");
439         strbuf_addstr(&head, branch);
440         ref = find_ref_by_name(refs, head.buf);
441         strbuf_release(&head);
442
443         return ref;
444 }
445
446 static struct ref *wanted_peer_refs(const struct ref *refs,
447                 struct refspec *refspec)
448 {
449         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
450         struct ref *local_refs = head;
451         struct ref **tail = head ? &head->next : &local_refs;
452
453         if (option_single_branch) {
454                 struct ref *remote_head = NULL;
455
456                 if (!option_branch)
457                         remote_head = guess_remote_head(head, refs, 0);
458                 else {
459                         local_refs = NULL;
460                         tail = &local_refs;
461                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
462                 }
463
464                 if (!remote_head && option_branch)
465                         warning(_("Could not find remote branch %s to clone."),
466                                 option_branch);
467                 else {
468                         get_fetch_map(remote_head, refspec, &tail, 0);
469
470                         /* if --branch=tag, pull the requested tag explicitly */
471                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
472                 }
473         } else
474                 get_fetch_map(refs, refspec, &tail, 0);
475
476         if (!option_mirror && !option_single_branch)
477                 get_fetch_map(refs, tag_refspec, &tail, 0);
478
479         return local_refs;
480 }
481
482 static void write_remote_refs(const struct ref *local_refs)
483 {
484         const struct ref *r;
485
486         lock_packed_refs(LOCK_DIE_ON_ERROR);
487
488         for (r = local_refs; r; r = r->next) {
489                 if (!r->peer_ref)
490                         continue;
491                 add_packed_ref(r->peer_ref->name, r->old_sha1);
492         }
493
494         if (commit_packed_refs())
495                 die_errno("unable to overwrite old ref-pack file");
496 }
497
498 static void write_followtags(const struct ref *refs, const char *msg)
499 {
500         const struct ref *ref;
501         for (ref = refs; ref; ref = ref->next) {
502                 if (!starts_with(ref->name, "refs/tags/"))
503                         continue;
504                 if (ends_with(ref->name, "^{}"))
505                         continue;
506                 if (!has_sha1_file(ref->old_sha1))
507                         continue;
508                 update_ref(msg, ref->name, ref->old_sha1,
509                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
510         }
511 }
512
513 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
514 {
515         struct ref **rm = cb_data;
516         struct ref *ref = *rm;
517
518         /*
519          * Skip anything missing a peer_ref, which we are not
520          * actually going to write a ref for.
521          */
522         while (ref && !ref->peer_ref)
523                 ref = ref->next;
524         /* Returning -1 notes "end of list" to the caller. */
525         if (!ref)
526                 return -1;
527
528         hashcpy(sha1, ref->old_sha1);
529         *rm = ref->next;
530         return 0;
531 }
532
533 static void update_remote_refs(const struct ref *refs,
534                                const struct ref *mapped_refs,
535                                const struct ref *remote_head_points_at,
536                                const char *branch_top,
537                                const char *msg,
538                                struct transport *transport,
539                                int check_connectivity)
540 {
541         const struct ref *rm = mapped_refs;
542
543         if (check_connectivity) {
544                 if (transport->progress)
545                         fprintf(stderr, _("Checking connectivity... "));
546                 if (check_everything_connected_with_transport(iterate_ref_map,
547                                                               0, &rm, transport))
548                         die(_("remote did not send all necessary objects"));
549                 if (transport->progress)
550                         fprintf(stderr, _("done.\n"));
551         }
552
553         if (refs) {
554                 write_remote_refs(mapped_refs);
555                 if (option_single_branch)
556                         write_followtags(refs, msg);
557         }
558
559         if (remote_head_points_at && !option_bare) {
560                 struct strbuf head_ref = STRBUF_INIT;
561                 strbuf_addstr(&head_ref, branch_top);
562                 strbuf_addstr(&head_ref, "HEAD");
563                 create_symref(head_ref.buf,
564                               remote_head_points_at->peer_ref->name,
565                               msg);
566         }
567 }
568
569 static void update_head(const struct ref *our, const struct ref *remote,
570                         const char *msg)
571 {
572         const char *head;
573         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
574                 /* Local default branch link */
575                 create_symref("HEAD", our->name, NULL);
576                 if (!option_bare) {
577                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
578                                    UPDATE_REFS_DIE_ON_ERR);
579                         install_branch_config(0, head, option_origin, our->name);
580                 }
581         } else if (our) {
582                 struct commit *c = lookup_commit_reference(our->old_sha1);
583                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
584                 update_ref(msg, "HEAD", c->object.sha1,
585                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
586         } else if (remote) {
587                 /*
588                  * We know remote HEAD points to a non-branch, or
589                  * HEAD points to a branch but we don't know which one.
590                  * Detach HEAD in all these cases.
591                  */
592                 update_ref(msg, "HEAD", remote->old_sha1,
593                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
594         }
595 }
596
597 static int checkout(void)
598 {
599         unsigned char sha1[20];
600         char *head;
601         struct lock_file *lock_file;
602         struct unpack_trees_options opts;
603         struct tree *tree;
604         struct tree_desc t;
605         int err = 0;
606
607         if (option_no_checkout)
608                 return 0;
609
610         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
611         if (!head) {
612                 warning(_("remote HEAD refers to nonexistent ref, "
613                           "unable to checkout.\n"));
614                 return 0;
615         }
616         if (!strcmp(head, "HEAD")) {
617                 if (advice_detached_head)
618                         detach_advice(sha1_to_hex(sha1));
619         } else {
620                 if (!starts_with(head, "refs/heads/"))
621                         die(_("HEAD not found below refs/heads!"));
622         }
623         free(head);
624
625         /* We need to be in the new work tree for the checkout */
626         setup_work_tree();
627
628         lock_file = xcalloc(1, sizeof(struct lock_file));
629         hold_locked_index(lock_file, 1);
630
631         memset(&opts, 0, sizeof opts);
632         opts.update = 1;
633         opts.merge = 1;
634         opts.fn = oneway_merge;
635         opts.verbose_update = (option_verbosity >= 0);
636         opts.src_index = &the_index;
637         opts.dst_index = &the_index;
638
639         tree = parse_tree_indirect(sha1);
640         parse_tree(tree);
641         init_tree_desc(&t, tree->buffer, tree->size);
642         if (unpack_trees(1, &t, &opts) < 0)
643                 die(_("unable to checkout working tree"));
644
645         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
646                 die(_("unable to write new index file"));
647
648         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
649                            sha1_to_hex(sha1), "1", NULL);
650
651         if (!err && option_recursive)
652                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
653
654         return err;
655 }
656
657 static int write_one_config(const char *key, const char *value, void *data)
658 {
659         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
660 }
661
662 static void write_config(struct string_list *config)
663 {
664         int i;
665
666         for (i = 0; i < config->nr; i++) {
667                 if (git_config_parse_parameter(config->items[i].string,
668                                                write_one_config, NULL) < 0)
669                         die("unable to write parameters to config file");
670         }
671 }
672
673 static void write_refspec_config(const char *src_ref_prefix,
674                 const struct ref *our_head_points_at,
675                 const struct ref *remote_head_points_at,
676                 struct strbuf *branch_top)
677 {
678         struct strbuf key = STRBUF_INIT;
679         struct strbuf value = STRBUF_INIT;
680
681         if (option_mirror || !option_bare) {
682                 if (option_single_branch && !option_mirror) {
683                         if (option_branch) {
684                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
685                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
686                                                 our_head_points_at->name);
687                                 else
688                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
689                                                 branch_top->buf, option_branch);
690                         } else if (remote_head_points_at) {
691                                 const char *head = remote_head_points_at->name;
692                                 if (!skip_prefix(head, "refs/heads/", &head))
693                                         die("BUG: remote HEAD points at non-head?");
694
695                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
696                                                 branch_top->buf, head);
697                         }
698                         /*
699                          * otherwise, the next "git fetch" will
700                          * simply fetch from HEAD without updating
701                          * any remote-tracking branch, which is what
702                          * we want.
703                          */
704                 } else {
705                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
706                 }
707                 /* Configure the remote */
708                 if (value.len) {
709                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
710                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
711                         strbuf_reset(&key);
712
713                         if (option_mirror) {
714                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
715                                 git_config_set(key.buf, "true");
716                                 strbuf_reset(&key);
717                         }
718                 }
719         }
720
721         strbuf_release(&key);
722         strbuf_release(&value);
723 }
724
725 static void dissociate_from_references(void)
726 {
727         static const char* argv[] = { "repack", "-a", "-d", NULL };
728
729         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
730                 die(_("cannot repack to clean up"));
731         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
732                 die_errno(_("cannot unlink temporary alternates file"));
733 }
734
735 int cmd_clone(int argc, const char **argv, const char *prefix)
736 {
737         int is_bundle = 0, is_local;
738         struct stat buf;
739         const char *repo_name, *repo, *work_tree, *git_dir;
740         char *path, *dir;
741         int dest_exists;
742         const struct ref *refs, *remote_head;
743         const struct ref *remote_head_points_at;
744         const struct ref *our_head_points_at;
745         struct ref *mapped_refs;
746         const struct ref *ref;
747         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
748         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
749         struct transport *transport = NULL;
750         const char *src_ref_prefix = "refs/heads/";
751         struct remote *remote;
752         int err = 0, complete_refs_before_fetch = 1;
753
754         struct refspec *refspec;
755         const char *fetch_pattern;
756
757         packet_trace_identity("clone");
758         argc = parse_options(argc, argv, prefix, builtin_clone_options,
759                              builtin_clone_usage, 0);
760
761         if (argc > 2)
762                 usage_msg_opt(_("Too many arguments."),
763                         builtin_clone_usage, builtin_clone_options);
764
765         if (argc == 0)
766                 usage_msg_opt(_("You must specify a repository to clone."),
767                         builtin_clone_usage, builtin_clone_options);
768
769         if (option_single_branch == -1)
770                 option_single_branch = option_depth ? 1 : 0;
771
772         if (option_mirror)
773                 option_bare = 1;
774
775         if (option_bare) {
776                 if (option_origin)
777                         die(_("--bare and --origin %s options are incompatible."),
778                             option_origin);
779                 if (real_git_dir)
780                         die(_("--bare and --separate-git-dir are incompatible."));
781                 option_no_checkout = 1;
782         }
783
784         if (!option_origin)
785                 option_origin = "origin";
786
787         repo_name = argv[0];
788
789         path = get_repo_path(repo_name, &is_bundle);
790         if (path)
791                 repo = xstrdup(absolute_path(repo_name));
792         else if (!strchr(repo_name, ':'))
793                 die(_("repository '%s' does not exist"), repo_name);
794         else
795                 repo = repo_name;
796
797         /* no need to be strict, transport_set_option() will validate it again */
798         if (option_depth && atoi(option_depth) < 1)
799                 die(_("depth %s is not a positive number"), option_depth);
800
801         if (argc == 2)
802                 dir = xstrdup(argv[1]);
803         else
804                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
805         strip_trailing_slashes(dir);
806
807         dest_exists = !stat(dir, &buf);
808         if (dest_exists && !is_empty_dir(dir))
809                 die(_("destination path '%s' already exists and is not "
810                         "an empty directory."), dir);
811
812         strbuf_addf(&reflog_msg, "clone: from %s", repo);
813
814         if (option_bare)
815                 work_tree = NULL;
816         else {
817                 work_tree = getenv("GIT_WORK_TREE");
818                 if (work_tree && !stat(work_tree, &buf))
819                         die(_("working tree '%s' already exists."), work_tree);
820         }
821
822         if (option_bare || work_tree)
823                 git_dir = xstrdup(dir);
824         else {
825                 work_tree = dir;
826                 git_dir = mkpathdup("%s/.git", dir);
827         }
828
829         atexit(remove_junk);
830         sigchain_push_common(remove_junk_on_signal);
831
832         if (!option_bare) {
833                 if (safe_create_leading_directories_const(work_tree) < 0)
834                         die_errno(_("could not create leading directories of '%s'"),
835                                   work_tree);
836                 if (!dest_exists && mkdir(work_tree, 0777))
837                         die_errno(_("could not create work tree dir '%s'"),
838                                   work_tree);
839                 junk_work_tree = work_tree;
840                 set_git_work_tree(work_tree);
841         }
842
843         junk_git_dir = git_dir;
844         if (safe_create_leading_directories_const(git_dir) < 0)
845                 die(_("could not create leading directories of '%s'"), git_dir);
846
847         set_git_dir_init(git_dir, real_git_dir, 0);
848         if (real_git_dir) {
849                 git_dir = real_git_dir;
850                 junk_git_dir = real_git_dir;
851         }
852
853         if (0 <= option_verbosity) {
854                 if (option_bare)
855                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
856                 else
857                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
858         }
859         init_db(option_template, INIT_DB_QUIET);
860         write_config(&option_config);
861
862         git_config(git_default_config, NULL);
863
864         if (option_bare) {
865                 if (option_mirror)
866                         src_ref_prefix = "refs/";
867                 strbuf_addstr(&branch_top, src_ref_prefix);
868
869                 git_config_set("core.bare", "true");
870         } else {
871                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
872         }
873
874         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
875         strbuf_addf(&key, "remote.%s.url", option_origin);
876         git_config_set(key.buf, repo);
877         strbuf_reset(&key);
878
879         if (option_reference.nr)
880                 setup_reference();
881         else if (option_dissociate) {
882                 warning(_("--dissociate given, but there is no --reference"));
883                 option_dissociate = 0;
884         }
885
886         fetch_pattern = value.buf;
887         refspec = parse_fetch_refspec(1, &fetch_pattern);
888
889         strbuf_reset(&value);
890
891         remote = remote_get(option_origin);
892         transport = transport_get(remote, remote->url[0]);
893         transport_set_verbosity(transport, option_verbosity, option_progress);
894
895         path = get_repo_path(remote->url[0], &is_bundle);
896         is_local = option_local != 0 && path && !is_bundle;
897         if (is_local) {
898                 if (option_depth)
899                         warning(_("--depth is ignored in local clones; use file:// instead."));
900                 if (!access(mkpath("%s/shallow", path), F_OK)) {
901                         if (option_local > 0)
902                                 warning(_("source repository is shallow, ignoring --local"));
903                         is_local = 0;
904                 }
905         }
906         if (option_local > 0 && !is_local)
907                 warning(_("--local is ignored"));
908         transport->cloning = 1;
909
910         if (!transport->get_refs_list || (!is_local && !transport->fetch))
911                 die(_("Don't know how to clone %s"), transport->url);
912
913         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
914
915         if (option_depth)
916                 transport_set_option(transport, TRANS_OPT_DEPTH,
917                                      option_depth);
918         if (option_single_branch)
919                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
920
921         if (option_upload_pack)
922                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
923                                      option_upload_pack);
924
925         if (transport->smart_options && !option_depth)
926                 transport->smart_options->check_self_contained_and_connected = 1;
927
928         refs = transport_get_remote_refs(transport);
929
930         if (refs) {
931                 mapped_refs = wanted_peer_refs(refs, refspec);
932                 /*
933                  * transport_get_remote_refs() may return refs with null sha-1
934                  * in mapped_refs (see struct transport->get_refs_list
935                  * comment). In that case we need fetch it early because
936                  * remote_head code below relies on it.
937                  *
938                  * for normal clones, transport_get_remote_refs() should
939                  * return reliable ref set, we can delay cloning until after
940                  * remote HEAD check.
941                  */
942                 for (ref = refs; ref; ref = ref->next)
943                         if (is_null_sha1(ref->old_sha1)) {
944                                 complete_refs_before_fetch = 0;
945                                 break;
946                         }
947
948                 if (!is_local && !complete_refs_before_fetch)
949                         transport_fetch_refs(transport, mapped_refs);
950
951                 remote_head = find_ref_by_name(refs, "HEAD");
952                 remote_head_points_at =
953                         guess_remote_head(remote_head, mapped_refs, 0);
954
955                 if (option_branch) {
956                         our_head_points_at =
957                                 find_remote_branch(mapped_refs, option_branch);
958
959                         if (!our_head_points_at)
960                                 die(_("Remote branch %s not found in upstream %s"),
961                                     option_branch, option_origin);
962                 }
963                 else
964                         our_head_points_at = remote_head_points_at;
965         }
966         else {
967                 if (option_branch)
968                         die(_("Remote branch %s not found in upstream %s"),
969                                         option_branch, option_origin);
970
971                 warning(_("You appear to have cloned an empty repository."));
972                 mapped_refs = NULL;
973                 our_head_points_at = NULL;
974                 remote_head_points_at = NULL;
975                 remote_head = NULL;
976                 option_no_checkout = 1;
977                 if (!option_bare)
978                         install_branch_config(0, "master", option_origin,
979                                               "refs/heads/master");
980         }
981
982         write_refspec_config(src_ref_prefix, our_head_points_at,
983                         remote_head_points_at, &branch_top);
984
985         if (is_local)
986                 clone_local(path, git_dir);
987         else if (refs && complete_refs_before_fetch)
988                 transport_fetch_refs(transport, mapped_refs);
989
990         update_remote_refs(refs, mapped_refs, remote_head_points_at,
991                            branch_top.buf, reflog_msg.buf, transport, !is_local);
992
993         update_head(our_head_points_at, remote_head, reflog_msg.buf);
994
995         transport_unlock_pack(transport);
996         transport_disconnect(transport);
997
998         if (option_dissociate)
999                 dissociate_from_references();
1000
1001         junk_mode = JUNK_LEAVE_REPO;
1002         err = checkout();
1003
1004         strbuf_release(&reflog_msg);
1005         strbuf_release(&branch_top);
1006         strbuf_release(&key);
1007         strbuf_release(&value);
1008         junk_mode = JUNK_LEAVE_ALL;
1009
1010         free(refspec);
1011         return err;
1012 }