Merge branch 'dm/http-cleanup'
[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
27 /*
28  * Overall FIXMEs:
29  *  - respect DB_ENVIRONMENT for .git/objects.
30  *
31  * Implementation notes:
32  *  - dropping use-separate-remote and no-separate-remote compatibility
33  *
34  */
35 static const char * const builtin_clone_usage[] = {
36         "git clone [options] [--] <repo> [<dir>]",
37         NULL
38 };
39
40 static int option_no_checkout, option_bare, option_mirror;
41 static int option_local, option_no_hardlinks, option_shared, option_recursive;
42 static char *option_template, *option_reference, *option_depth;
43 static char *option_origin = NULL;
44 static char *option_branch = NULL;
45 static const char *real_git_dir;
46 static char *option_upload_pack = "git-upload-pack";
47 static int option_verbosity;
48 static int option_progress;
49
50 static struct option builtin_clone_options[] = {
51         OPT__VERBOSITY(&option_verbosity),
52         OPT_BOOLEAN(0, "progress", &option_progress,
53                         "force progress reporting"),
54         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
55                     "don't create a checkout"),
56         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
57         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
58                 "create a bare repository",
59                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
60         OPT_BOOLEAN(0, "mirror", &option_mirror,
61                     "create a mirror repository (implies bare)"),
62         OPT_BOOLEAN('l', "local", &option_local,
63                     "to clone from a local repository"),
64         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
65                     "don't use local hardlinks, always copy"),
66         OPT_BOOLEAN('s', "shared", &option_shared,
67                     "setup as shared repository"),
68         OPT_BOOLEAN(0, "recursive", &option_recursive,
69                     "initialize submodules in the clone"),
70         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
71                     "initialize submodules in the clone"),
72         OPT_STRING(0, "template", &option_template, "template-directory",
73                    "directory from which templates will be used"),
74         OPT_STRING(0, "reference", &option_reference, "repo",
75                    "reference repository"),
76         OPT_STRING('o', "origin", &option_origin, "branch",
77                    "use <branch> instead of 'origin' to track upstream"),
78         OPT_STRING('b', "branch", &option_branch, "branch",
79                    "checkout <branch> instead of the remote's HEAD"),
80         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
81                    "path to git-upload-pack on the remote"),
82         OPT_STRING(0, "depth", &option_depth, "depth",
83                     "create a shallow clone of that depth"),
84         OPT_STRING('L', "separate-git-dir", &real_git_dir, "gitdir",
85                    "separate git dir from working tree"),
86
87         OPT_END()
88 };
89
90 static const char *argv_submodule[] = {
91         "submodule", "update", "--init", "--recursive", NULL
92 };
93
94 static char *get_repo_path(const char *repo, int *is_bundle)
95 {
96         static char *suffix[] = { "/.git", ".git", "" };
97         static char *bundle_suffix[] = { ".bundle", "" };
98         struct stat st;
99         int i;
100
101         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
102                 const char *path;
103                 path = mkpath("%s%s", repo, suffix[i]);
104                 if (is_directory(path)) {
105                         *is_bundle = 0;
106                         return xstrdup(absolute_path(path));
107                 }
108         }
109
110         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
111                 const char *path;
112                 path = mkpath("%s%s", repo, bundle_suffix[i]);
113                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
114                         *is_bundle = 1;
115                         return xstrdup(absolute_path(path));
116                 }
117         }
118
119         return NULL;
120 }
121
122 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
123 {
124         const char *end = repo + strlen(repo), *start;
125         char *dir;
126
127         /*
128          * Strip trailing spaces, slashes and /.git
129          */
130         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
131                 end--;
132         if (end - repo > 5 && is_dir_sep(end[-5]) &&
133             !strncmp(end - 4, ".git", 4)) {
134                 end -= 5;
135                 while (repo < end && is_dir_sep(end[-1]))
136                         end--;
137         }
138
139         /*
140          * Find last component, but be prepared that repo could have
141          * the form  "remote.example.com:foo.git", i.e. no slash
142          * in the directory part.
143          */
144         start = end;
145         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
146                 start--;
147
148         /*
149          * Strip .{bundle,git}.
150          */
151         if (is_bundle) {
152                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
153                         end -= 7;
154         } else {
155                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
156                         end -= 4;
157         }
158
159         if (is_bare) {
160                 struct strbuf result = STRBUF_INIT;
161                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
162                 dir = strbuf_detach(&result, NULL);
163         } else
164                 dir = xstrndup(start, end - start);
165         /*
166          * Replace sequences of 'control' characters and whitespace
167          * with one ascii space, remove leading and trailing spaces.
168          */
169         if (*dir) {
170                 char *out = dir;
171                 int prev_space = 1 /* strip leading whitespace */;
172                 for (end = dir; *end; ++end) {
173                         char ch = *end;
174                         if ((unsigned char)ch < '\x20')
175                                 ch = '\x20';
176                         if (isspace(ch)) {
177                                 if (prev_space)
178                                         continue;
179                                 prev_space = 1;
180                         } else
181                                 prev_space = 0;
182                         *out++ = ch;
183                 }
184                 *out = '\0';
185                 if (out > dir && prev_space)
186                         out[-1] = '\0';
187         }
188         return dir;
189 }
190
191 static void strip_trailing_slashes(char *dir)
192 {
193         char *end = dir + strlen(dir);
194
195         while (dir < end - 1 && is_dir_sep(end[-1]))
196                 end--;
197         *end = '\0';
198 }
199
200 static void setup_reference(const char *repo)
201 {
202         const char *ref_git;
203         char *ref_git_copy;
204
205         struct remote *remote;
206         struct transport *transport;
207         const struct ref *extra;
208
209         ref_git = real_path(option_reference);
210
211         if (is_directory(mkpath("%s/.git/objects", ref_git)))
212                 ref_git = mkpath("%s/.git", ref_git);
213         else if (!is_directory(mkpath("%s/objects", ref_git)))
214                 die(_("reference repository '%s' is not a local directory."),
215                     option_reference);
216
217         ref_git_copy = xstrdup(ref_git);
218
219         add_to_alternates_file(ref_git_copy);
220
221         remote = remote_get(ref_git_copy);
222         transport = transport_get(remote, ref_git_copy);
223         for (extra = transport_get_remote_refs(transport); extra;
224              extra = extra->next)
225                 add_extra_ref(extra->name, extra->old_sha1, 0);
226
227         transport_disconnect(transport);
228
229         free(ref_git_copy);
230 }
231
232 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
233 {
234         struct dirent *de;
235         struct stat buf;
236         int src_len, dest_len;
237         DIR *dir;
238
239         dir = opendir(src->buf);
240         if (!dir)
241                 die_errno(_("failed to open '%s'"), src->buf);
242
243         if (mkdir(dest->buf, 0777)) {
244                 if (errno != EEXIST)
245                         die_errno(_("failed to create directory '%s'"), dest->buf);
246                 else if (stat(dest->buf, &buf))
247                         die_errno(_("failed to stat '%s'"), dest->buf);
248                 else if (!S_ISDIR(buf.st_mode))
249                         die(_("%s exists and is not a directory"), dest->buf);
250         }
251
252         strbuf_addch(src, '/');
253         src_len = src->len;
254         strbuf_addch(dest, '/');
255         dest_len = dest->len;
256
257         while ((de = readdir(dir)) != NULL) {
258                 strbuf_setlen(src, src_len);
259                 strbuf_addstr(src, de->d_name);
260                 strbuf_setlen(dest, dest_len);
261                 strbuf_addstr(dest, de->d_name);
262                 if (stat(src->buf, &buf)) {
263                         warning (_("failed to stat %s\n"), src->buf);
264                         continue;
265                 }
266                 if (S_ISDIR(buf.st_mode)) {
267                         if (de->d_name[0] != '.')
268                                 copy_or_link_directory(src, dest);
269                         continue;
270                 }
271
272                 if (unlink(dest->buf) && errno != ENOENT)
273                         die_errno(_("failed to unlink '%s'"), dest->buf);
274                 if (!option_no_hardlinks) {
275                         if (!link(src->buf, dest->buf))
276                                 continue;
277                         if (option_local)
278                                 die_errno(_("failed to create link '%s'"), dest->buf);
279                         option_no_hardlinks = 1;
280                 }
281                 if (copy_file_with_time(dest->buf, src->buf, 0666))
282                         die_errno(_("failed to copy file to '%s'"), dest->buf);
283         }
284         closedir(dir);
285 }
286
287 static const struct ref *clone_local(const char *src_repo,
288                                      const char *dest_repo)
289 {
290         const struct ref *ret;
291         struct strbuf src = STRBUF_INIT;
292         struct strbuf dest = STRBUF_INIT;
293         struct remote *remote;
294         struct transport *transport;
295
296         if (option_shared)
297                 add_to_alternates_file(src_repo);
298         else {
299                 strbuf_addf(&src, "%s/objects", src_repo);
300                 strbuf_addf(&dest, "%s/objects", dest_repo);
301                 copy_or_link_directory(&src, &dest);
302                 strbuf_release(&src);
303                 strbuf_release(&dest);
304         }
305
306         remote = remote_get(src_repo);
307         transport = transport_get(remote, src_repo);
308         ret = transport_get_remote_refs(transport);
309         transport_disconnect(transport);
310         if (0 <= option_verbosity)
311                 printf(_("done.\n"));
312         return ret;
313 }
314
315 static const char *junk_work_tree;
316 static const char *junk_git_dir;
317 static pid_t junk_pid;
318
319 static void remove_junk(void)
320 {
321         struct strbuf sb = STRBUF_INIT;
322         if (getpid() != junk_pid)
323                 return;
324         if (junk_git_dir) {
325                 strbuf_addstr(&sb, junk_git_dir);
326                 remove_dir_recursively(&sb, 0);
327                 strbuf_reset(&sb);
328         }
329         if (junk_work_tree) {
330                 strbuf_addstr(&sb, junk_work_tree);
331                 remove_dir_recursively(&sb, 0);
332                 strbuf_reset(&sb);
333         }
334 }
335
336 static void remove_junk_on_signal(int signo)
337 {
338         remove_junk();
339         sigchain_pop(signo);
340         raise(signo);
341 }
342
343 static struct ref *wanted_peer_refs(const struct ref *refs,
344                 struct refspec *refspec)
345 {
346         struct ref *local_refs = NULL;
347         struct ref **tail = &local_refs;
348
349         get_fetch_map(refs, refspec, &tail, 0);
350         if (!option_mirror)
351                 get_fetch_map(refs, tag_refspec, &tail, 0);
352
353         return local_refs;
354 }
355
356 static void write_remote_refs(const struct ref *local_refs)
357 {
358         const struct ref *r;
359
360         for (r = local_refs; r; r = r->next)
361                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
362
363         pack_refs(PACK_REFS_ALL);
364         clear_extra_refs();
365 }
366
367 int cmd_clone(int argc, const char **argv, const char *prefix)
368 {
369         int is_bundle = 0, is_local;
370         struct stat buf;
371         const char *repo_name, *repo, *work_tree, *git_dir;
372         char *path, *dir;
373         int dest_exists;
374         const struct ref *refs, *remote_head;
375         const struct ref *remote_head_points_at;
376         const struct ref *our_head_points_at;
377         struct ref *mapped_refs;
378         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
379         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
380         struct transport *transport = NULL;
381         char *src_ref_prefix = "refs/heads/";
382         int err = 0;
383
384         struct refspec *refspec;
385         const char *fetch_pattern;
386
387         junk_pid = getpid();
388
389         packet_trace_identity("clone");
390         argc = parse_options(argc, argv, prefix, builtin_clone_options,
391                              builtin_clone_usage, 0);
392
393         if (argc > 2)
394                 usage_msg_opt(_("Too many arguments."),
395                         builtin_clone_usage, builtin_clone_options);
396
397         if (argc == 0)
398                 usage_msg_opt(_("You must specify a repository to clone."),
399                         builtin_clone_usage, builtin_clone_options);
400
401         if (option_mirror)
402                 option_bare = 1;
403
404         if (option_bare) {
405                 if (option_origin)
406                         die(_("--bare and --origin %s options are incompatible."),
407                             option_origin);
408                 option_no_checkout = 1;
409         }
410
411         if (!option_origin)
412                 option_origin = "origin";
413
414         repo_name = argv[0];
415
416         path = get_repo_path(repo_name, &is_bundle);
417         if (path)
418                 repo = xstrdup(absolute_path(repo_name));
419         else if (!strchr(repo_name, ':'))
420                 die(_("repository '%s' does not exist"), repo_name);
421         else
422                 repo = repo_name;
423         is_local = path && !is_bundle;
424         if (is_local && option_depth)
425                 warning(_("--depth is ignored in local clones; use file:// instead."));
426
427         if (argc == 2)
428                 dir = xstrdup(argv[1]);
429         else
430                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
431         strip_trailing_slashes(dir);
432
433         dest_exists = !stat(dir, &buf);
434         if (dest_exists && !is_empty_dir(dir))
435                 die(_("destination path '%s' already exists and is not "
436                         "an empty directory."), dir);
437
438         strbuf_addf(&reflog_msg, "clone: from %s", repo);
439
440         if (option_bare)
441                 work_tree = NULL;
442         else {
443                 work_tree = getenv("GIT_WORK_TREE");
444                 if (work_tree && !stat(work_tree, &buf))
445                         die(_("working tree '%s' already exists."), work_tree);
446         }
447
448         if (option_bare || work_tree)
449                 git_dir = xstrdup(dir);
450         else {
451                 work_tree = dir;
452                 git_dir = xstrdup(mkpath("%s/.git", dir));
453         }
454
455         if (!option_bare) {
456                 junk_work_tree = work_tree;
457                 if (safe_create_leading_directories_const(work_tree) < 0)
458                         die_errno(_("could not create leading directories of '%s'"),
459                                   work_tree);
460                 if (!dest_exists && mkdir(work_tree, 0755))
461                         die_errno(_("could not create work tree dir '%s'."),
462                                   work_tree);
463                 set_git_work_tree(work_tree);
464         }
465         junk_git_dir = git_dir;
466         atexit(remove_junk);
467         sigchain_push_common(remove_junk_on_signal);
468
469         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
470
471         if (safe_create_leading_directories_const(git_dir) < 0)
472                 die(_("could not create leading directories of '%s'"), git_dir);
473
474         set_git_dir_init(git_dir, real_git_dir, 0);
475         if (real_git_dir)
476                 git_dir = real_git_dir;
477
478         if (0 <= option_verbosity) {
479                 if (option_bare)
480                         printf(_("Cloning into bare repository %s...\n"), dir);
481                 else
482                         printf(_("Cloning into %s...\n"), dir);
483         }
484         init_db(option_template, INIT_DB_QUIET);
485
486         /*
487          * At this point, the config exists, so we do not need the
488          * environment variable.  We actually need to unset it, too, to
489          * re-enable parsing of the global configs.
490          */
491         unsetenv(CONFIG_ENVIRONMENT);
492
493         git_config(git_default_config, NULL);
494
495         if (option_bare) {
496                 if (option_mirror)
497                         src_ref_prefix = "refs/";
498                 strbuf_addstr(&branch_top, src_ref_prefix);
499
500                 git_config_set("core.bare", "true");
501         } else {
502                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
503         }
504
505         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
506
507         if (option_mirror || !option_bare) {
508                 /* Configure the remote */
509                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
510                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
511                 strbuf_reset(&key);
512
513                 if (option_mirror) {
514                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
515                         git_config_set(key.buf, "true");
516                         strbuf_reset(&key);
517                 }
518         }
519
520         strbuf_addf(&key, "remote.%s.url", option_origin);
521         git_config_set(key.buf, repo);
522         strbuf_reset(&key);
523
524         if (option_reference)
525                 setup_reference(git_dir);
526
527         fetch_pattern = value.buf;
528         refspec = parse_fetch_refspec(1, &fetch_pattern);
529
530         strbuf_reset(&value);
531
532         if (is_local) {
533                 refs = clone_local(path, git_dir);
534                 mapped_refs = wanted_peer_refs(refs, refspec);
535         } else {
536                 struct remote *remote = remote_get(option_origin);
537                 transport = transport_get(remote, remote->url[0]);
538
539                 if (!transport->get_refs_list || !transport->fetch)
540                         die(_("Don't know how to clone %s"), transport->url);
541
542                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
543
544                 if (option_depth)
545                         transport_set_option(transport, TRANS_OPT_DEPTH,
546                                              option_depth);
547
548                 transport_set_verbosity(transport, option_verbosity, option_progress);
549
550                 if (option_upload_pack)
551                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
552                                              option_upload_pack);
553
554                 refs = transport_get_remote_refs(transport);
555                 if (refs) {
556                         mapped_refs = wanted_peer_refs(refs, refspec);
557                         transport_fetch_refs(transport, mapped_refs);
558                 }
559         }
560
561         if (refs) {
562                 clear_extra_refs();
563
564                 write_remote_refs(mapped_refs);
565
566                 remote_head = find_ref_by_name(refs, "HEAD");
567                 remote_head_points_at =
568                         guess_remote_head(remote_head, mapped_refs, 0);
569
570                 if (option_branch) {
571                         struct strbuf head = STRBUF_INIT;
572                         strbuf_addstr(&head, src_ref_prefix);
573                         strbuf_addstr(&head, option_branch);
574                         our_head_points_at =
575                                 find_ref_by_name(mapped_refs, head.buf);
576                         strbuf_release(&head);
577
578                         if (!our_head_points_at) {
579                                 warning(_("Remote branch %s not found in "
580                                         "upstream %s, using HEAD instead"),
581                                         option_branch, option_origin);
582                                 our_head_points_at = remote_head_points_at;
583                         }
584                 }
585                 else
586                         our_head_points_at = remote_head_points_at;
587         }
588         else {
589                 warning(_("You appear to have cloned an empty repository."));
590                 our_head_points_at = NULL;
591                 remote_head_points_at = NULL;
592                 remote_head = NULL;
593                 option_no_checkout = 1;
594                 if (!option_bare)
595                         install_branch_config(0, "master", option_origin,
596                                               "refs/heads/master");
597         }
598
599         if (remote_head_points_at && !option_bare) {
600                 struct strbuf head_ref = STRBUF_INIT;
601                 strbuf_addstr(&head_ref, branch_top.buf);
602                 strbuf_addstr(&head_ref, "HEAD");
603                 create_symref(head_ref.buf,
604                               remote_head_points_at->peer_ref->name,
605                               reflog_msg.buf);
606         }
607
608         if (our_head_points_at) {
609                 /* Local default branch link */
610                 create_symref("HEAD", our_head_points_at->name, NULL);
611                 if (!option_bare) {
612                         const char *head = skip_prefix(our_head_points_at->name,
613                                                        "refs/heads/");
614                         update_ref(reflog_msg.buf, "HEAD",
615                                    our_head_points_at->old_sha1,
616                                    NULL, 0, DIE_ON_ERR);
617                         install_branch_config(0, head, option_origin,
618                                               our_head_points_at->name);
619                 }
620         } else if (remote_head) {
621                 /* Source had detached HEAD pointing somewhere. */
622                 if (!option_bare) {
623                         update_ref(reflog_msg.buf, "HEAD",
624                                    remote_head->old_sha1,
625                                    NULL, REF_NODEREF, DIE_ON_ERR);
626                         our_head_points_at = remote_head;
627                 }
628         } else {
629                 /* Nothing to checkout out */
630                 if (!option_no_checkout)
631                         warning(_("remote HEAD refers to nonexistent ref, "
632                                 "unable to checkout.\n"));
633                 option_no_checkout = 1;
634         }
635
636         if (transport) {
637                 transport_unlock_pack(transport);
638                 transport_disconnect(transport);
639         }
640
641         if (!option_no_checkout) {
642                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
643                 struct unpack_trees_options opts;
644                 struct tree *tree;
645                 struct tree_desc t;
646                 int fd;
647
648                 /* We need to be in the new work tree for the checkout */
649                 setup_work_tree();
650
651                 fd = hold_locked_index(lock_file, 1);
652
653                 memset(&opts, 0, sizeof opts);
654                 opts.update = 1;
655                 opts.merge = 1;
656                 opts.fn = oneway_merge;
657                 opts.verbose_update = (option_verbosity > 0);
658                 opts.src_index = &the_index;
659                 opts.dst_index = &the_index;
660
661                 tree = parse_tree_indirect(our_head_points_at->old_sha1);
662                 parse_tree(tree);
663                 init_tree_desc(&t, tree->buffer, tree->size);
664                 unpack_trees(1, &t, &opts);
665
666                 if (write_cache(fd, active_cache, active_nr) ||
667                     commit_locked_index(lock_file))
668                         die(_("unable to write new index file"));
669
670                 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
671                                 sha1_to_hex(our_head_points_at->old_sha1), "1",
672                                 NULL);
673
674                 if (!err && option_recursive)
675                         err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
676         }
677
678         strbuf_release(&reflog_msg);
679         strbuf_release(&branch_top);
680         strbuf_release(&key);
681         strbuf_release(&value);
682         junk_pid = 0;
683         return err;
684 }