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8434c2f1 DB |
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 "cache.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" | |
3e8aded2 | 21 | #include "pack-refs.h" |
8434c2f1 DB |
22 | |
23 | /* | |
24 | * Overall FIXMEs: | |
25 | * - respect DB_ENVIRONMENT for .git/objects. | |
26 | * | |
27 | * Implementation notes: | |
28 | * - dropping use-separate-remote and no-separate-remote compatibility | |
29 | * | |
30 | */ | |
31 | static const char * const builtin_clone_usage[] = { | |
32 | "git-clone [options] [--] <repo> [<dir>]", | |
33 | NULL | |
34 | }; | |
35 | ||
36 | static int option_quiet, option_no_checkout, option_bare; | |
37 | static int option_local, option_no_hardlinks, option_shared; | |
38 | static char *option_template, *option_reference, *option_depth; | |
39 | static char *option_origin = NULL; | |
40 | static char *option_upload_pack = "git-upload-pack"; | |
41 | ||
42 | static struct option builtin_clone_options[] = { | |
43 | OPT__QUIET(&option_quiet), | |
44 | OPT_BOOLEAN('n', "no-checkout", &option_no_checkout, | |
45 | "don't create a checkout"), | |
46 | OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"), | |
47 | OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"), | |
48 | OPT_BOOLEAN('l', "local", &option_local, | |
49 | "to clone from a local repository"), | |
50 | OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks, | |
51 | "don't use local hardlinks, always copy"), | |
52 | OPT_BOOLEAN('s', "shared", &option_shared, | |
53 | "setup as shared repository"), | |
54 | OPT_STRING(0, "template", &option_template, "path", | |
55 | "path the template repository"), | |
56 | OPT_STRING(0, "reference", &option_reference, "repo", | |
57 | "reference repository"), | |
58 | OPT_STRING('o', "origin", &option_origin, "branch", | |
59 | "use <branch> instead or 'origin' to track upstream"), | |
60 | OPT_STRING('u', "upload-pack", &option_upload_pack, "path", | |
61 | "path to git-upload-pack on the remote"), | |
62 | OPT_STRING(0, "depth", &option_depth, "depth", | |
63 | "create a shallow clone of that depth"), | |
64 | ||
65 | OPT_END() | |
66 | }; | |
67 | ||
68 | static char *get_repo_path(const char *repo, int *is_bundle) | |
69 | { | |
70 | static char *suffix[] = { "/.git", ".git", "" }; | |
71 | static char *bundle_suffix[] = { ".bundle", "" }; | |
72 | struct stat st; | |
73 | int i; | |
74 | ||
75 | for (i = 0; i < ARRAY_SIZE(suffix); i++) { | |
76 | const char *path; | |
77 | path = mkpath("%s%s", repo, suffix[i]); | |
78 | if (!stat(path, &st) && S_ISDIR(st.st_mode)) { | |
79 | *is_bundle = 0; | |
1b9a9467 | 80 | return xstrdup(make_nonrelative_path(path)); |
8434c2f1 DB |
81 | } |
82 | } | |
83 | ||
84 | for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) { | |
85 | const char *path; | |
86 | path = mkpath("%s%s", repo, bundle_suffix[i]); | |
87 | if (!stat(path, &st) && S_ISREG(st.st_mode)) { | |
88 | *is_bundle = 1; | |
1b9a9467 | 89 | return xstrdup(make_nonrelative_path(path)); |
8434c2f1 DB |
90 | } |
91 | } | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
96 | static char *guess_dir_name(const char *repo, int is_bundle) | |
97 | { | |
98 | const char *p, *start, *end, *limit; | |
99 | int after_slash_or_colon; | |
100 | ||
101 | /* Guess dir name from repository: strip trailing '/', | |
102 | * strip trailing '[:/]*.{git,bundle}', strip leading '.*[/:]'. */ | |
103 | ||
104 | after_slash_or_colon = 1; | |
105 | limit = repo + strlen(repo); | |
106 | start = repo; | |
107 | end = limit; | |
108 | for (p = repo; p < limit; p++) { | |
109 | const char *prefix = is_bundle ? ".bundle" : ".git"; | |
110 | if (!prefixcmp(p, prefix)) { | |
111 | if (!after_slash_or_colon) | |
112 | end = p; | |
113 | p += strlen(prefix) - 1; | |
114 | } else if (!prefixcmp(p, ".bundle")) { | |
115 | if (!after_slash_or_colon) | |
116 | end = p; | |
117 | p += 7; | |
118 | } else if (*p == '/' || *p == ':') { | |
119 | if (end == limit) | |
120 | end = p; | |
121 | after_slash_or_colon = 1; | |
122 | } else if (after_slash_or_colon) { | |
123 | start = p; | |
124 | end = limit; | |
125 | after_slash_or_colon = 0; | |
126 | } | |
127 | } | |
128 | ||
129 | return xstrndup(start, end - start); | |
130 | } | |
131 | ||
132 | static int is_directory(const char *path) | |
133 | { | |
134 | struct stat buf; | |
135 | ||
136 | return !stat(path, &buf) && S_ISDIR(buf.st_mode); | |
137 | } | |
138 | ||
139 | static void setup_reference(const char *repo) | |
140 | { | |
141 | const char *ref_git; | |
142 | char *ref_git_copy; | |
143 | ||
144 | struct remote *remote; | |
145 | struct transport *transport; | |
146 | const struct ref *extra; | |
147 | ||
148 | ref_git = make_absolute_path(option_reference); | |
149 | ||
150 | if (is_directory(mkpath("%s/.git/objects", ref_git))) | |
151 | ref_git = mkpath("%s/.git", ref_git); | |
152 | else if (!is_directory(mkpath("%s/objects", ref_git))) | |
153 | die("reference repository '%s' is not a local directory.", | |
154 | option_reference); | |
155 | ||
156 | ref_git_copy = xstrdup(ref_git); | |
157 | ||
158 | add_to_alternates_file(ref_git_copy); | |
159 | ||
160 | remote = remote_get(ref_git_copy); | |
161 | transport = transport_get(remote, ref_git_copy); | |
162 | for (extra = transport_get_remote_refs(transport); extra; | |
163 | extra = extra->next) | |
164 | add_extra_ref(extra->name, extra->old_sha1, 0); | |
165 | ||
166 | transport_disconnect(transport); | |
167 | ||
168 | free(ref_git_copy); | |
169 | } | |
170 | ||
171 | static void copy_or_link_directory(char *src, char *dest) | |
172 | { | |
173 | struct dirent *de; | |
174 | struct stat buf; | |
175 | int src_len, dest_len; | |
176 | DIR *dir; | |
177 | ||
178 | dir = opendir(src); | |
179 | if (!dir) | |
180 | die("failed to open %s\n", src); | |
181 | ||
182 | if (mkdir(dest, 0777)) { | |
183 | if (errno != EEXIST) | |
184 | die("failed to create directory %s\n", dest); | |
185 | else if (stat(dest, &buf)) | |
186 | die("failed to stat %s\n", dest); | |
187 | else if (!S_ISDIR(buf.st_mode)) | |
188 | die("%s exists and is not a directory\n", dest); | |
189 | } | |
190 | ||
191 | src_len = strlen(src); | |
192 | src[src_len] = '/'; | |
193 | dest_len = strlen(dest); | |
194 | dest[dest_len] = '/'; | |
195 | ||
196 | while ((de = readdir(dir)) != NULL) { | |
197 | strcpy(src + src_len + 1, de->d_name); | |
198 | strcpy(dest + dest_len + 1, de->d_name); | |
199 | if (stat(src, &buf)) { | |
200 | warning ("failed to stat %s\n", src); | |
201 | continue; | |
202 | } | |
203 | if (S_ISDIR(buf.st_mode)) { | |
204 | if (de->d_name[0] != '.') | |
205 | copy_or_link_directory(src, dest); | |
206 | continue; | |
207 | } | |
208 | ||
209 | if (unlink(dest) && errno != ENOENT) | |
210 | die("failed to unlink %s\n", dest); | |
fdabc242 DB |
211 | if (!option_no_hardlinks) { |
212 | if (!link(src, dest)) | |
213 | continue; | |
214 | if (option_local) | |
8434c2f1 | 215 | die("failed to create link %s\n", dest); |
fdabc242 | 216 | option_no_hardlinks = 1; |
8434c2f1 | 217 | } |
fdabc242 DB |
218 | if (copy_file(dest, src, 0666)) |
219 | die("failed to copy file to %s\n", dest); | |
8434c2f1 | 220 | } |
689ef4d4 | 221 | closedir(dir); |
8434c2f1 DB |
222 | } |
223 | ||
224 | static const struct ref *clone_local(const char *src_repo, | |
225 | const char *dest_repo) | |
226 | { | |
227 | const struct ref *ret; | |
228 | char src[PATH_MAX]; | |
229 | char dest[PATH_MAX]; | |
230 | struct remote *remote; | |
231 | struct transport *transport; | |
232 | ||
233 | if (option_shared) | |
234 | add_to_alternates_file(src_repo); | |
235 | else { | |
236 | snprintf(src, PATH_MAX, "%s/objects", src_repo); | |
237 | snprintf(dest, PATH_MAX, "%s/objects", dest_repo); | |
238 | copy_or_link_directory(src, dest); | |
239 | } | |
240 | ||
241 | remote = remote_get(src_repo); | |
242 | transport = transport_get(remote, src_repo); | |
243 | ret = transport_get_remote_refs(transport); | |
244 | transport_disconnect(transport); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | static const char *junk_work_tree; | |
249 | static const char *junk_git_dir; | |
250 | pid_t junk_pid; | |
251 | ||
252 | static void remove_junk(void) | |
253 | { | |
254 | struct strbuf sb; | |
255 | if (getpid() != junk_pid) | |
256 | return; | |
257 | strbuf_init(&sb, 0); | |
258 | if (junk_git_dir) { | |
259 | strbuf_addstr(&sb, junk_git_dir); | |
260 | remove_dir_recursively(&sb, 0); | |
261 | strbuf_reset(&sb); | |
262 | } | |
263 | if (junk_work_tree) { | |
264 | strbuf_addstr(&sb, junk_work_tree); | |
265 | remove_dir_recursively(&sb, 0); | |
266 | strbuf_reset(&sb); | |
267 | } | |
268 | } | |
269 | ||
270 | static void remove_junk_on_signal(int signo) | |
271 | { | |
272 | remove_junk(); | |
273 | signal(SIGINT, SIG_DFL); | |
274 | raise(signo); | |
275 | } | |
276 | ||
277 | static const struct ref *locate_head(const struct ref *refs, | |
278 | const struct ref *mapped_refs, | |
279 | const struct ref **remote_head_p) | |
280 | { | |
281 | const struct ref *remote_head = NULL; | |
282 | const struct ref *remote_master = NULL; | |
283 | const struct ref *r; | |
284 | for (r = refs; r; r = r->next) | |
285 | if (!strcmp(r->name, "HEAD")) | |
286 | remote_head = r; | |
287 | ||
288 | for (r = mapped_refs; r; r = r->next) | |
289 | if (!strcmp(r->name, "refs/heads/master")) | |
290 | remote_master = r; | |
291 | ||
292 | if (remote_head_p) | |
293 | *remote_head_p = remote_head; | |
294 | ||
295 | /* If there's no HEAD value at all, never mind. */ | |
296 | if (!remote_head) | |
297 | return NULL; | |
298 | ||
299 | /* If refs/heads/master could be right, it is. */ | |
300 | if (remote_master && !hashcmp(remote_master->old_sha1, | |
301 | remote_head->old_sha1)) | |
302 | return remote_master; | |
303 | ||
304 | /* Look for another ref that points there */ | |
305 | for (r = mapped_refs; r; r = r->next) | |
306 | if (r != remote_head && | |
307 | !hashcmp(r->old_sha1, remote_head->old_sha1)) | |
308 | return r; | |
309 | ||
310 | /* Nothing is the same */ | |
311 | return NULL; | |
312 | } | |
313 | ||
314 | static struct ref *write_remote_refs(const struct ref *refs, | |
315 | struct refspec *refspec, const char *reflog) | |
316 | { | |
317 | struct ref *local_refs = NULL; | |
318 | struct ref **tail = &local_refs; | |
319 | struct ref *r; | |
320 | ||
321 | get_fetch_map(refs, refspec, &tail, 0); | |
322 | get_fetch_map(refs, tag_refspec, &tail, 0); | |
323 | ||
324 | for (r = local_refs; r; r = r->next) | |
3e8aded2 JH |
325 | add_extra_ref(r->peer_ref->name, r->old_sha1, 0); |
326 | ||
327 | pack_refs(PACK_REFS_ALL); | |
328 | clear_extra_refs(); | |
329 | ||
8434c2f1 DB |
330 | return local_refs; |
331 | } | |
332 | ||
333 | int cmd_clone(int argc, const char **argv, const char *prefix) | |
334 | { | |
335 | int use_local_hardlinks = 1; | |
336 | int use_separate_remote = 1; | |
337 | int is_bundle = 0; | |
338 | struct stat buf; | |
339 | const char *repo_name, *repo, *work_tree, *git_dir; | |
340 | char *path, *dir; | |
341 | const struct ref *refs, *head_points_at, *remote_head, *mapped_refs; | |
342 | char branch_top[256], key[256], value[256]; | |
343 | struct strbuf reflog_msg; | |
344 | ||
345 | struct refspec refspec; | |
346 | ||
347 | junk_pid = getpid(); | |
348 | ||
349 | argc = parse_options(argc, argv, builtin_clone_options, | |
350 | builtin_clone_usage, 0); | |
351 | ||
352 | if (argc == 0) | |
353 | die("You must specify a repository to clone."); | |
354 | ||
355 | if (option_no_hardlinks) | |
356 | use_local_hardlinks = 0; | |
357 | ||
358 | if (option_bare) { | |
359 | if (option_origin) | |
360 | die("--bare and --origin %s options are incompatible.", | |
361 | option_origin); | |
362 | option_no_checkout = 1; | |
363 | use_separate_remote = 0; | |
364 | } | |
365 | ||
366 | if (!option_origin) | |
367 | option_origin = "origin"; | |
368 | ||
369 | repo_name = argv[0]; | |
370 | ||
371 | path = get_repo_path(repo_name, &is_bundle); | |
372 | if (path) | |
373 | repo = path; | |
374 | else if (!strchr(repo_name, ':')) | |
375 | repo = xstrdup(make_absolute_path(repo_name)); | |
376 | else | |
377 | repo = repo_name; | |
378 | ||
379 | if (argc == 2) | |
380 | dir = xstrdup(argv[1]); | |
381 | else | |
382 | dir = guess_dir_name(repo_name, is_bundle); | |
383 | ||
384 | if (!stat(dir, &buf)) | |
385 | die("destination directory '%s' already exists.", dir); | |
386 | ||
387 | strbuf_init(&reflog_msg, 0); | |
388 | strbuf_addf(&reflog_msg, "clone: from %s", repo); | |
389 | ||
390 | if (option_bare) | |
391 | work_tree = NULL; | |
392 | else { | |
393 | work_tree = getenv("GIT_WORK_TREE"); | |
394 | if (work_tree && !stat(work_tree, &buf)) | |
395 | die("working tree '%s' already exists.", work_tree); | |
396 | } | |
397 | ||
398 | if (option_bare || work_tree) | |
399 | git_dir = xstrdup(dir); | |
400 | else { | |
401 | work_tree = dir; | |
402 | git_dir = xstrdup(mkpath("%s/.git", dir)); | |
403 | } | |
404 | ||
405 | if (!option_bare) { | |
406 | junk_work_tree = work_tree; | |
8e21d63b JK |
407 | if (safe_create_leading_directories_const(work_tree) < 0) |
408 | die("could not create leading directories of '%s'", | |
409 | work_tree); | |
8434c2f1 DB |
410 | if (mkdir(work_tree, 0755)) |
411 | die("could not create work tree dir '%s'.", work_tree); | |
412 | set_git_work_tree(work_tree); | |
413 | } | |
414 | junk_git_dir = git_dir; | |
415 | atexit(remove_junk); | |
416 | signal(SIGINT, remove_junk_on_signal); | |
417 | ||
418 | setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1); | |
419 | ||
8e21d63b JK |
420 | if (safe_create_leading_directories_const(git_dir) < 0) |
421 | die("could not create leading directories of '%s'", git_dir); | |
8434c2f1 DB |
422 | set_git_dir(make_absolute_path(git_dir)); |
423 | ||
424 | fprintf(stderr, "Initialize %s\n", git_dir); | |
425 | init_db(option_template, option_quiet ? INIT_DB_QUIET : 0); | |
426 | ||
5b8063b5 JS |
427 | /* |
428 | * At this point, the config exists, so we do not need the | |
429 | * environment variable. We actually need to unset it, too, to | |
430 | * re-enable parsing of the global configs. | |
431 | */ | |
432 | unsetenv(CONFIG_ENVIRONMENT); | |
433 | ||
8434c2f1 DB |
434 | if (option_reference) |
435 | setup_reference(git_dir); | |
436 | ||
9bd81e42 | 437 | git_config(git_default_config, NULL); |
8434c2f1 DB |
438 | |
439 | if (option_bare) { | |
440 | strcpy(branch_top, "refs/heads/"); | |
441 | ||
442 | git_config_set("core.bare", "true"); | |
443 | } else { | |
444 | snprintf(branch_top, sizeof(branch_top), | |
445 | "refs/remotes/%s/", option_origin); | |
446 | ||
447 | /* Configure the remote */ | |
448 | snprintf(key, sizeof(key), "remote.%s.url", option_origin); | |
449 | git_config_set(key, repo); | |
450 | ||
451 | snprintf(key, sizeof(key), "remote.%s.fetch", option_origin); | |
452 | snprintf(value, sizeof(value), | |
453 | "+refs/heads/*:%s*", branch_top); | |
454 | git_config_set_multivar(key, value, "^$", 0); | |
455 | } | |
456 | ||
457 | refspec.force = 0; | |
458 | refspec.pattern = 1; | |
459 | refspec.src = "refs/heads/"; | |
460 | refspec.dst = branch_top; | |
461 | ||
462 | if (path && !is_bundle) | |
463 | refs = clone_local(path, git_dir); | |
464 | else { | |
465 | struct remote *remote = remote_get(argv[0]); | |
bc0c0d81 JS |
466 | struct transport *transport = |
467 | transport_get(remote, remote->url[0]); | |
8434c2f1 | 468 | |
37b78c25 JK |
469 | if (!transport->get_refs_list || !transport->fetch) |
470 | die("Don't know how to clone %s", transport->url); | |
471 | ||
8434c2f1 DB |
472 | transport_set_option(transport, TRANS_OPT_KEEP, "yes"); |
473 | ||
474 | if (option_depth) | |
475 | transport_set_option(transport, TRANS_OPT_DEPTH, | |
476 | option_depth); | |
477 | ||
478 | if (option_quiet) | |
479 | transport->verbose = -1; | |
480 | ||
481 | refs = transport_get_remote_refs(transport); | |
482 | transport_fetch_refs(transport, refs); | |
483 | } | |
484 | ||
485 | clear_extra_refs(); | |
486 | ||
487 | mapped_refs = write_remote_refs(refs, &refspec, reflog_msg.buf); | |
488 | ||
489 | head_points_at = locate_head(refs, mapped_refs, &remote_head); | |
490 | ||
491 | if (head_points_at) { | |
492 | /* Local default branch link */ | |
493 | create_symref("HEAD", head_points_at->name, NULL); | |
494 | ||
495 | if (!option_bare) { | |
496 | struct strbuf head_ref; | |
497 | const char *head = head_points_at->name; | |
498 | ||
499 | if (!prefixcmp(head, "refs/heads/")) | |
500 | head += 11; | |
501 | ||
502 | /* Set up the initial local branch */ | |
503 | ||
504 | /* Local branch initial value */ | |
505 | update_ref(reflog_msg.buf, "HEAD", | |
506 | head_points_at->old_sha1, | |
507 | NULL, 0, DIE_ON_ERR); | |
508 | ||
509 | strbuf_init(&head_ref, 0); | |
510 | strbuf_addstr(&head_ref, branch_top); | |
511 | strbuf_addstr(&head_ref, "HEAD"); | |
512 | ||
513 | /* Remote branch link */ | |
514 | create_symref(head_ref.buf, | |
515 | head_points_at->peer_ref->name, | |
516 | reflog_msg.buf); | |
517 | ||
518 | snprintf(key, sizeof(key), "branch.%s.remote", head); | |
519 | git_config_set(key, option_origin); | |
520 | snprintf(key, sizeof(key), "branch.%s.merge", head); | |
521 | git_config_set(key, head_points_at->name); | |
522 | } | |
523 | } else if (remote_head) { | |
524 | /* Source had detached HEAD pointing somewhere. */ | |
525 | if (!option_bare) | |
526 | update_ref(reflog_msg.buf, "HEAD", | |
527 | remote_head->old_sha1, | |
528 | NULL, REF_NODEREF, DIE_ON_ERR); | |
529 | } else { | |
530 | /* Nothing to checkout out */ | |
531 | if (!option_no_checkout) | |
532 | warning("remote HEAD refers to nonexistent ref, " | |
533 | "unable to checkout.\n"); | |
534 | option_no_checkout = 1; | |
535 | } | |
536 | ||
537 | if (!option_no_checkout) { | |
538 | struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); | |
539 | struct unpack_trees_options opts; | |
540 | struct tree *tree; | |
541 | struct tree_desc t; | |
542 | int fd; | |
543 | ||
544 | /* We need to be in the new work tree for the checkout */ | |
545 | setup_work_tree(); | |
546 | ||
547 | fd = hold_locked_index(lock_file, 1); | |
548 | ||
549 | memset(&opts, 0, sizeof opts); | |
550 | opts.update = 1; | |
a73bc127 JS |
551 | opts.merge = 1; |
552 | opts.fn = oneway_merge; | |
8434c2f1 | 553 | opts.verbose_update = !option_quiet; |
a73bc127 | 554 | opts.src_index = &the_index; |
8434c2f1 DB |
555 | opts.dst_index = &the_index; |
556 | ||
557 | tree = parse_tree_indirect(remote_head->old_sha1); | |
558 | parse_tree(tree); | |
559 | init_tree_desc(&t, tree->buffer, tree->size); | |
560 | unpack_trees(1, &t, &opts); | |
561 | ||
562 | if (write_cache(fd, active_cache, active_nr) || | |
563 | commit_locked_index(lock_file)) | |
564 | die("unable to write new index file"); | |
565 | } | |
566 | ||
567 | strbuf_release(&reflog_msg); | |
568 | junk_pid = 0; | |
569 | return 0; | |
570 | } |