Git-aware CGI to provide dumb HTTP transport
[git.git] / builtin-clone.c
blob5762a6f9d8191c79d4fd66d227038d59ab1e785e
1 /*
2 * Builtin "git clone"
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
8 * Clone a repository into a different directory that does not yet exist.
9 */
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"
21 #include "pack-refs.h"
22 #include "sigchain.h"
23 #include "branch.h"
24 #include "remote.h"
25 #include "run-command.h"
28 * Overall FIXMEs:
29 * - respect DB_ENVIRONMENT for .git/objects.
31 * Implementation notes:
32 * - dropping use-separate-remote and no-separate-remote compatibility
35 static const char * const builtin_clone_usage[] = {
36 "git clone [options] [--] <repo> [<dir>]",
37 NULL
40 static int option_quiet, 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 char *option_upload_pack = "git-upload-pack";
46 static int option_verbose;
48 static struct option builtin_clone_options[] = {
49 OPT__QUIET(&option_quiet),
50 OPT__VERBOSE(&option_verbose),
51 OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
52 "don't create a checkout"),
53 OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
54 OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
55 OPT_BOOLEAN(0, "mirror", &option_mirror,
56 "create a mirror repository (implies bare)"),
57 OPT_BOOLEAN('l', "local", &option_local,
58 "to clone from a local repository"),
59 OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
60 "don't use local hardlinks, always copy"),
61 OPT_BOOLEAN('s', "shared", &option_shared,
62 "setup as shared repository"),
63 OPT_BOOLEAN(0, "recursive", &option_recursive,
64 "setup as shared repository"),
65 OPT_STRING(0, "template", &option_template, "path",
66 "path the template repository"),
67 OPT_STRING(0, "reference", &option_reference, "repo",
68 "reference repository"),
69 OPT_STRING('o', "origin", &option_origin, "branch",
70 "use <branch> instead of 'origin' to track upstream"),
71 OPT_STRING('b', "branch", &option_branch, "branch",
72 "checkout <branch> instead of the remote's HEAD"),
73 OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
74 "path to git-upload-pack on the remote"),
75 OPT_STRING(0, "depth", &option_depth, "depth",
76 "create a shallow clone of that depth"),
78 OPT_END()
81 static const char *argv_submodule[] = {
82 "submodule", "update", "--init", "--recursive", NULL
85 static char *get_repo_path(const char *repo, int *is_bundle)
87 static char *suffix[] = { "/.git", ".git", "" };
88 static char *bundle_suffix[] = { ".bundle", "" };
89 struct stat st;
90 int i;
92 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
93 const char *path;
94 path = mkpath("%s%s", repo, suffix[i]);
95 if (is_directory(path)) {
96 *is_bundle = 0;
97 return xstrdup(make_nonrelative_path(path));
101 for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
102 const char *path;
103 path = mkpath("%s%s", repo, bundle_suffix[i]);
104 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
105 *is_bundle = 1;
106 return xstrdup(make_nonrelative_path(path));
110 return NULL;
113 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
115 const char *end = repo + strlen(repo), *start;
116 char *dir;
119 * Strip trailing spaces, slashes and /.git
121 while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
122 end--;
123 if (end - repo > 5 && is_dir_sep(end[-5]) &&
124 !strncmp(end - 4, ".git", 4)) {
125 end -= 5;
126 while (repo < end && is_dir_sep(end[-1]))
127 end--;
131 * Find last component, but be prepared that repo could have
132 * the form "remote.example.com:foo.git", i.e. no slash
133 * in the directory part.
135 start = end;
136 while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
137 start--;
140 * Strip .{bundle,git}.
142 if (is_bundle) {
143 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
144 end -= 7;
145 } else {
146 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
147 end -= 4;
150 if (is_bare) {
151 struct strbuf result = STRBUF_INIT;
152 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
153 dir = strbuf_detach(&result, NULL);
154 } else
155 dir = xstrndup(start, end - start);
157 * Replace sequences of 'control' characters and whitespace
158 * with one ascii space, remove leading and trailing spaces.
160 if (*dir) {
161 char *out = dir;
162 int prev_space = 1 /* strip leading whitespace */;
163 for (end = dir; *end; ++end) {
164 char ch = *end;
165 if ((unsigned char)ch < '\x20')
166 ch = '\x20';
167 if (isspace(ch)) {
168 if (prev_space)
169 continue;
170 prev_space = 1;
171 } else
172 prev_space = 0;
173 *out++ = ch;
175 *out = '\0';
176 if (out > dir && prev_space)
177 out[-1] = '\0';
179 return dir;
182 static void strip_trailing_slashes(char *dir)
184 char *end = dir + strlen(dir);
186 while (dir < end - 1 && is_dir_sep(end[-1]))
187 end--;
188 *end = '\0';
191 static void setup_reference(const char *repo)
193 const char *ref_git;
194 char *ref_git_copy;
196 struct remote *remote;
197 struct transport *transport;
198 const struct ref *extra;
200 ref_git = make_absolute_path(option_reference);
202 if (is_directory(mkpath("%s/.git/objects", ref_git)))
203 ref_git = mkpath("%s/.git", ref_git);
204 else if (!is_directory(mkpath("%s/objects", ref_git)))
205 die("reference repository '%s' is not a local directory.",
206 option_reference);
208 ref_git_copy = xstrdup(ref_git);
210 add_to_alternates_file(ref_git_copy);
212 remote = remote_get(ref_git_copy);
213 transport = transport_get(remote, ref_git_copy);
214 for (extra = transport_get_remote_refs(transport); extra;
215 extra = extra->next)
216 add_extra_ref(extra->name, extra->old_sha1, 0);
218 transport_disconnect(transport);
220 free(ref_git_copy);
223 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
225 struct dirent *de;
226 struct stat buf;
227 int src_len, dest_len;
228 DIR *dir;
230 dir = opendir(src->buf);
231 if (!dir)
232 die_errno("failed to open '%s'", src->buf);
234 if (mkdir(dest->buf, 0777)) {
235 if (errno != EEXIST)
236 die_errno("failed to create directory '%s'", dest->buf);
237 else if (stat(dest->buf, &buf))
238 die_errno("failed to stat '%s'", dest->buf);
239 else if (!S_ISDIR(buf.st_mode))
240 die("%s exists and is not a directory", dest->buf);
243 strbuf_addch(src, '/');
244 src_len = src->len;
245 strbuf_addch(dest, '/');
246 dest_len = dest->len;
248 while ((de = readdir(dir)) != NULL) {
249 strbuf_setlen(src, src_len);
250 strbuf_addstr(src, de->d_name);
251 strbuf_setlen(dest, dest_len);
252 strbuf_addstr(dest, de->d_name);
253 if (stat(src->buf, &buf)) {
254 warning ("failed to stat %s\n", src->buf);
255 continue;
257 if (S_ISDIR(buf.st_mode)) {
258 if (de->d_name[0] != '.')
259 copy_or_link_directory(src, dest);
260 continue;
263 if (unlink(dest->buf) && errno != ENOENT)
264 die_errno("failed to unlink '%s'", dest->buf);
265 if (!option_no_hardlinks) {
266 if (!link(src->buf, dest->buf))
267 continue;
268 if (option_local)
269 die_errno("failed to create link '%s'", dest->buf);
270 option_no_hardlinks = 1;
272 if (copy_file_with_time(dest->buf, src->buf, 0666))
273 die_errno("failed to copy file to '%s'", dest->buf);
275 closedir(dir);
278 static const struct ref *clone_local(const char *src_repo,
279 const char *dest_repo)
281 const struct ref *ret;
282 struct strbuf src = STRBUF_INIT;
283 struct strbuf dest = STRBUF_INIT;
284 struct remote *remote;
285 struct transport *transport;
287 if (option_shared)
288 add_to_alternates_file(src_repo);
289 else {
290 strbuf_addf(&src, "%s/objects", src_repo);
291 strbuf_addf(&dest, "%s/objects", dest_repo);
292 copy_or_link_directory(&src, &dest);
293 strbuf_release(&src);
294 strbuf_release(&dest);
297 remote = remote_get(src_repo);
298 transport = transport_get(remote, src_repo);
299 ret = transport_get_remote_refs(transport);
300 transport_disconnect(transport);
301 return ret;
304 static const char *junk_work_tree;
305 static const char *junk_git_dir;
306 static pid_t junk_pid;
308 static void remove_junk(void)
310 struct strbuf sb = STRBUF_INIT;
311 if (getpid() != junk_pid)
312 return;
313 if (junk_git_dir) {
314 strbuf_addstr(&sb, junk_git_dir);
315 remove_dir_recursively(&sb, 0);
316 strbuf_reset(&sb);
318 if (junk_work_tree) {
319 strbuf_addstr(&sb, junk_work_tree);
320 remove_dir_recursively(&sb, 0);
321 strbuf_reset(&sb);
325 static void remove_junk_on_signal(int signo)
327 remove_junk();
328 sigchain_pop(signo);
329 raise(signo);
332 static struct ref *wanted_peer_refs(const struct ref *refs,
333 struct refspec *refspec)
335 struct ref *local_refs = NULL;
336 struct ref **tail = &local_refs;
338 get_fetch_map(refs, refspec, &tail, 0);
339 if (!option_mirror)
340 get_fetch_map(refs, tag_refspec, &tail, 0);
342 return local_refs;
345 static void write_remote_refs(const struct ref *local_refs)
347 const struct ref *r;
349 for (r = local_refs; r; r = r->next)
350 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
352 pack_refs(PACK_REFS_ALL);
353 clear_extra_refs();
356 int cmd_clone(int argc, const char **argv, const char *prefix)
358 int is_bundle = 0;
359 struct stat buf;
360 const char *repo_name, *repo, *work_tree, *git_dir;
361 char *path, *dir;
362 int dest_exists;
363 const struct ref *refs, *remote_head, *mapped_refs;
364 const struct ref *remote_head_points_at;
365 const struct ref *our_head_points_at;
366 struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
367 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
368 struct transport *transport = NULL;
369 char *src_ref_prefix = "refs/heads/";
370 int err = 0;
372 struct refspec *refspec;
373 const char *fetch_pattern;
375 junk_pid = getpid();
377 argc = parse_options(argc, argv, prefix, builtin_clone_options,
378 builtin_clone_usage, 0);
380 if (argc == 0)
381 die("You must specify a repository to clone.");
383 if (option_mirror)
384 option_bare = 1;
386 if (option_bare) {
387 if (option_origin)
388 die("--bare and --origin %s options are incompatible.",
389 option_origin);
390 option_no_checkout = 1;
393 if (!option_origin)
394 option_origin = "origin";
396 repo_name = argv[0];
398 path = get_repo_path(repo_name, &is_bundle);
399 if (path)
400 repo = xstrdup(make_nonrelative_path(repo_name));
401 else if (!strchr(repo_name, ':'))
402 repo = xstrdup(make_absolute_path(repo_name));
403 else
404 repo = repo_name;
406 if (argc == 2)
407 dir = xstrdup(argv[1]);
408 else
409 dir = guess_dir_name(repo_name, is_bundle, option_bare);
410 strip_trailing_slashes(dir);
412 dest_exists = !stat(dir, &buf);
413 if (dest_exists && !is_empty_dir(dir))
414 die("destination path '%s' already exists and is not "
415 "an empty directory.", dir);
417 strbuf_addf(&reflog_msg, "clone: from %s", repo);
419 if (option_bare)
420 work_tree = NULL;
421 else {
422 work_tree = getenv("GIT_WORK_TREE");
423 if (work_tree && !stat(work_tree, &buf))
424 die("working tree '%s' already exists.", work_tree);
427 if (option_bare || work_tree)
428 git_dir = xstrdup(dir);
429 else {
430 work_tree = dir;
431 git_dir = xstrdup(mkpath("%s/.git", dir));
434 if (!option_bare) {
435 junk_work_tree = work_tree;
436 if (safe_create_leading_directories_const(work_tree) < 0)
437 die_errno("could not create leading directories of '%s'",
438 work_tree);
439 if (!dest_exists && mkdir(work_tree, 0755))
440 die_errno("could not create work tree dir '%s'.",
441 work_tree);
442 set_git_work_tree(work_tree);
444 junk_git_dir = git_dir;
445 atexit(remove_junk);
446 sigchain_push_common(remove_junk_on_signal);
448 setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
450 if (safe_create_leading_directories_const(git_dir) < 0)
451 die("could not create leading directories of '%s'", git_dir);
452 set_git_dir(make_absolute_path(git_dir));
454 init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
457 * At this point, the config exists, so we do not need the
458 * environment variable. We actually need to unset it, too, to
459 * re-enable parsing of the global configs.
461 unsetenv(CONFIG_ENVIRONMENT);
463 if (option_reference)
464 setup_reference(git_dir);
466 git_config(git_default_config, NULL);
468 if (option_bare) {
469 if (option_mirror)
470 src_ref_prefix = "refs/";
471 strbuf_addstr(&branch_top, src_ref_prefix);
473 git_config_set("core.bare", "true");
474 } else {
475 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
478 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
480 if (option_mirror || !option_bare) {
481 /* Configure the remote */
482 strbuf_addf(&key, "remote.%s.fetch", option_origin);
483 git_config_set_multivar(key.buf, value.buf, "^$", 0);
484 strbuf_reset(&key);
486 if (option_mirror) {
487 strbuf_addf(&key, "remote.%s.mirror", option_origin);
488 git_config_set(key.buf, "true");
489 strbuf_reset(&key);
492 strbuf_addf(&key, "remote.%s.url", option_origin);
493 git_config_set(key.buf, repo);
494 strbuf_reset(&key);
497 fetch_pattern = value.buf;
498 refspec = parse_fetch_refspec(1, &fetch_pattern);
500 strbuf_reset(&value);
502 if (path && !is_bundle) {
503 refs = clone_local(path, git_dir);
504 mapped_refs = wanted_peer_refs(refs, refspec);
505 } else {
506 struct remote *remote = remote_get(argv[0]);
507 transport = transport_get(remote, remote->url[0]);
509 if (!transport->get_refs_list || !transport->fetch)
510 die("Don't know how to clone %s", transport->url);
512 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
514 if (option_depth)
515 transport_set_option(transport, TRANS_OPT_DEPTH,
516 option_depth);
518 if (option_quiet)
519 transport->verbose = -1;
520 else if (option_verbose)
521 transport->progress = 1;
523 if (option_upload_pack)
524 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
525 option_upload_pack);
527 refs = transport_get_remote_refs(transport);
528 if (refs) {
529 mapped_refs = wanted_peer_refs(refs, refspec);
530 transport_fetch_refs(transport, mapped_refs);
534 if (refs) {
535 clear_extra_refs();
537 write_remote_refs(mapped_refs);
539 remote_head = find_ref_by_name(refs, "HEAD");
540 remote_head_points_at =
541 guess_remote_head(remote_head, mapped_refs, 0);
543 if (option_branch) {
544 struct strbuf head = STRBUF_INIT;
545 strbuf_addstr(&head, src_ref_prefix);
546 strbuf_addstr(&head, option_branch);
547 our_head_points_at =
548 find_ref_by_name(mapped_refs, head.buf);
549 strbuf_release(&head);
551 if (!our_head_points_at) {
552 warning("Remote branch %s not found in "
553 "upstream %s, using HEAD instead",
554 option_branch, option_origin);
555 our_head_points_at = remote_head_points_at;
558 else
559 our_head_points_at = remote_head_points_at;
561 else {
562 warning("You appear to have cloned an empty repository.");
563 our_head_points_at = NULL;
564 remote_head_points_at = NULL;
565 remote_head = NULL;
566 option_no_checkout = 1;
567 if (!option_bare)
568 install_branch_config(0, "master", option_origin,
569 "refs/heads/master");
572 if (remote_head_points_at && !option_bare) {
573 struct strbuf head_ref = STRBUF_INIT;
574 strbuf_addstr(&head_ref, branch_top.buf);
575 strbuf_addstr(&head_ref, "HEAD");
576 create_symref(head_ref.buf,
577 remote_head_points_at->peer_ref->name,
578 reflog_msg.buf);
581 if (our_head_points_at) {
582 /* Local default branch link */
583 create_symref("HEAD", our_head_points_at->name, NULL);
584 if (!option_bare) {
585 const char *head = skip_prefix(our_head_points_at->name,
586 "refs/heads/");
587 update_ref(reflog_msg.buf, "HEAD",
588 our_head_points_at->old_sha1,
589 NULL, 0, DIE_ON_ERR);
590 install_branch_config(0, head, option_origin,
591 our_head_points_at->name);
593 } else if (remote_head) {
594 /* Source had detached HEAD pointing somewhere. */
595 if (!option_bare) {
596 update_ref(reflog_msg.buf, "HEAD",
597 remote_head->old_sha1,
598 NULL, REF_NODEREF, DIE_ON_ERR);
599 our_head_points_at = remote_head;
601 } else {
602 /* Nothing to checkout out */
603 if (!option_no_checkout)
604 warning("remote HEAD refers to nonexistent ref, "
605 "unable to checkout.\n");
606 option_no_checkout = 1;
609 if (transport) {
610 transport_unlock_pack(transport);
611 transport_disconnect(transport);
614 if (!option_no_checkout) {
615 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
616 struct unpack_trees_options opts;
617 struct tree *tree;
618 struct tree_desc t;
619 int fd;
621 /* We need to be in the new work tree for the checkout */
622 setup_work_tree();
624 fd = hold_locked_index(lock_file, 1);
626 memset(&opts, 0, sizeof opts);
627 opts.update = 1;
628 opts.merge = 1;
629 opts.fn = oneway_merge;
630 opts.verbose_update = !option_quiet;
631 opts.src_index = &the_index;
632 opts.dst_index = &the_index;
634 tree = parse_tree_indirect(our_head_points_at->old_sha1);
635 parse_tree(tree);
636 init_tree_desc(&t, tree->buffer, tree->size);
637 unpack_trees(1, &t, &opts);
639 if (write_cache(fd, active_cache, active_nr) ||
640 commit_locked_index(lock_file))
641 die("unable to write new index file");
643 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
644 sha1_to_hex(our_head_points_at->old_sha1), "1",
645 NULL);
647 if (!err && option_recursive)
648 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
651 strbuf_release(&reflog_msg);
652 strbuf_release(&branch_top);
653 strbuf_release(&key);
654 strbuf_release(&value);
655 junk_pid = 0;
656 return err;