builtin-fast-export.c: turn error into warning
[git/dscho.git] / builtin-clone.c
blob0031b5f51cd96525a265dab02494700e9d36fce8
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;
42 static char *option_template, *option_reference, *option_depth;
43 static char *option_origin = NULL;
44 static char *option_upload_pack = "git-upload-pack";
45 static int option_verbose;
47 static struct option builtin_clone_options[] = {
48 OPT__QUIET(&option_quiet),
49 OPT__VERBOSE(&option_verbose),
50 OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
51 "don't create a checkout"),
52 OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
53 OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
54 OPT_BOOLEAN(0, "mirror", &option_mirror,
55 "create a mirror repository (implies bare)"),
56 OPT_BOOLEAN('l', "local", &option_local,
57 "to clone from a local repository"),
58 OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
59 "don't use local hardlinks, always copy"),
60 OPT_BOOLEAN('s', "shared", &option_shared,
61 "setup as shared repository"),
62 OPT_STRING(0, "template", &option_template, "path",
63 "path the template repository"),
64 OPT_STRING(0, "reference", &option_reference, "repo",
65 "reference repository"),
66 OPT_STRING('o', "origin", &option_origin, "branch",
67 "use <branch> instead of 'origin' to track upstream"),
68 OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
69 "path to git-upload-pack on the remote"),
70 OPT_STRING(0, "depth", &option_depth, "depth",
71 "create a shallow clone of that depth"),
73 OPT_END()
76 static char *get_repo_path(const char *repo, int *is_bundle)
78 static char *suffix[] = { "/.git", ".git", "" };
79 static char *bundle_suffix[] = { ".bundle", "" };
80 struct stat st;
81 int i;
83 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
84 const char *path;
85 path = mkpath("%s%s", repo, suffix[i]);
86 if (is_directory(path)) {
87 *is_bundle = 0;
88 return xstrdup(make_nonrelative_path(path));
92 for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
93 const char *path;
94 path = mkpath("%s%s", repo, bundle_suffix[i]);
95 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
96 *is_bundle = 1;
97 return xstrdup(make_nonrelative_path(path));
101 return NULL;
104 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
106 const char *end = repo + strlen(repo), *start;
109 * Strip trailing slashes and /.git
111 while (repo < end && is_dir_sep(end[-1]))
112 end--;
113 if (end - repo > 5 && is_dir_sep(end[-5]) &&
114 !strncmp(end - 4, ".git", 4)) {
115 end -= 5;
116 while (repo < end && is_dir_sep(end[-1]))
117 end--;
121 * Find last component, but be prepared that repo could have
122 * the form "remote.example.com:foo.git", i.e. no slash
123 * in the directory part.
125 start = end;
126 while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
127 start--;
130 * Strip .{bundle,git}.
132 if (is_bundle) {
133 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
134 end -= 7;
135 } else {
136 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
137 end -= 4;
140 if (is_bare) {
141 struct strbuf result = STRBUF_INIT;
142 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
143 return strbuf_detach(&result, 0);
146 return xstrndup(start, end - start);
149 static void strip_trailing_slashes(char *dir)
151 char *end = dir + strlen(dir);
153 while (dir < end - 1 && is_dir_sep(end[-1]))
154 end--;
155 *end = '\0';
158 static void setup_reference(const char *repo)
160 const char *ref_git;
161 char *ref_git_copy;
163 struct remote *remote;
164 struct transport *transport;
165 const struct ref *extra;
167 ref_git = make_absolute_path(option_reference);
169 if (is_directory(mkpath("%s/.git/objects", ref_git)))
170 ref_git = mkpath("%s/.git", ref_git);
171 else if (!is_directory(mkpath("%s/objects", ref_git)))
172 die("reference repository '%s' is not a local directory.",
173 option_reference);
175 ref_git_copy = xstrdup(ref_git);
177 add_to_alternates_file(ref_git_copy);
179 remote = remote_get(ref_git_copy);
180 transport = transport_get(remote, ref_git_copy);
181 for (extra = transport_get_remote_refs(transport); extra;
182 extra = extra->next)
183 add_extra_ref(extra->name, extra->old_sha1, 0);
185 transport_disconnect(transport);
187 free(ref_git_copy);
190 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
192 struct dirent *de;
193 struct stat buf;
194 int src_len, dest_len;
195 DIR *dir;
197 dir = opendir(src->buf);
198 if (!dir)
199 die("failed to open %s", src->buf);
201 if (mkdir(dest->buf, 0777)) {
202 if (errno != EEXIST)
203 die("failed to create directory %s", dest->buf);
204 else if (stat(dest->buf, &buf))
205 die("failed to stat %s", dest->buf);
206 else if (!S_ISDIR(buf.st_mode))
207 die("%s exists and is not a directory", dest->buf);
210 strbuf_addch(src, '/');
211 src_len = src->len;
212 strbuf_addch(dest, '/');
213 dest_len = dest->len;
215 while ((de = readdir(dir)) != NULL) {
216 strbuf_setlen(src, src_len);
217 strbuf_addstr(src, de->d_name);
218 strbuf_setlen(dest, dest_len);
219 strbuf_addstr(dest, de->d_name);
220 if (stat(src->buf, &buf)) {
221 warning ("failed to stat %s\n", src->buf);
222 continue;
224 if (S_ISDIR(buf.st_mode)) {
225 if (de->d_name[0] != '.')
226 copy_or_link_directory(src, dest);
227 continue;
230 if (unlink(dest->buf) && errno != ENOENT)
231 die("failed to unlink %s", dest->buf);
232 if (!option_no_hardlinks) {
233 if (!link(src->buf, dest->buf))
234 continue;
235 if (option_local)
236 die("failed to create link %s", dest->buf);
237 option_no_hardlinks = 1;
239 if (copy_file(dest->buf, src->buf, 0666))
240 die("failed to copy file to %s", dest->buf);
242 closedir(dir);
245 static const struct ref *clone_local(const char *src_repo,
246 const char *dest_repo)
248 const struct ref *ret;
249 struct strbuf src = STRBUF_INIT;
250 struct strbuf dest = STRBUF_INIT;
251 struct remote *remote;
252 struct transport *transport;
254 if (option_shared)
255 add_to_alternates_file(src_repo);
256 else {
257 strbuf_addf(&src, "%s/objects", src_repo);
258 strbuf_addf(&dest, "%s/objects", dest_repo);
259 copy_or_link_directory(&src, &dest);
260 strbuf_release(&src);
261 strbuf_release(&dest);
264 remote = remote_get(src_repo);
265 transport = transport_get(remote, src_repo);
266 ret = transport_get_remote_refs(transport);
267 transport_disconnect(transport);
268 return ret;
271 static const char *junk_work_tree;
272 static const char *junk_git_dir;
273 pid_t junk_pid;
275 static void remove_junk(void)
277 struct strbuf sb = STRBUF_INIT;
278 if (getpid() != junk_pid)
279 return;
280 if (junk_git_dir) {
281 strbuf_addstr(&sb, junk_git_dir);
282 remove_dir_recursively(&sb, 0);
283 strbuf_reset(&sb);
285 if (junk_work_tree) {
286 strbuf_addstr(&sb, junk_work_tree);
287 remove_dir_recursively(&sb, 0);
288 strbuf_reset(&sb);
292 static void remove_junk_on_signal(int signo)
294 remove_junk();
295 sigchain_pop(signo);
296 raise(signo);
299 static struct ref *write_remote_refs(const struct ref *refs,
300 struct refspec *refspec, const char *reflog)
302 struct ref *local_refs = NULL;
303 struct ref **tail = &local_refs;
304 struct ref *r;
306 get_fetch_map(refs, refspec, &tail, 0);
307 if (!option_mirror)
308 get_fetch_map(refs, tag_refspec, &tail, 0);
310 for (r = local_refs; r; r = r->next)
311 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
313 pack_refs(PACK_REFS_ALL);
314 clear_extra_refs();
316 return local_refs;
319 int cmd_clone(int argc, const char **argv, const char *prefix)
321 int is_bundle = 0;
322 struct stat buf;
323 const char *repo_name, *repo, *work_tree, *git_dir;
324 char *path, *dir;
325 int dest_exists;
326 const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
327 struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
328 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
329 struct transport *transport = NULL;
330 char *src_ref_prefix = "refs/heads/";
331 int err = 0;
333 struct refspec *refspec;
334 const char *fetch_pattern;
336 junk_pid = getpid();
338 argc = parse_options(argc, argv, builtin_clone_options,
339 builtin_clone_usage, 0);
341 if (argc == 0)
342 die("You must specify a repository to clone.");
344 if (option_mirror)
345 option_bare = 1;
347 if (option_bare) {
348 if (option_origin)
349 die("--bare and --origin %s options are incompatible.",
350 option_origin);
351 option_no_checkout = 1;
354 if (!option_origin)
355 option_origin = "origin";
357 repo_name = argv[0];
359 path = get_repo_path(repo_name, &is_bundle);
360 if (path)
361 repo = xstrdup(make_nonrelative_path(repo_name));
362 else if (!strchr(repo_name, ':'))
363 repo = xstrdup(make_absolute_path(repo_name));
364 else
365 repo = repo_name;
367 if (argc == 2)
368 dir = xstrdup(argv[1]);
369 else
370 dir = guess_dir_name(repo_name, is_bundle, option_bare);
371 strip_trailing_slashes(dir);
373 dest_exists = !stat(dir, &buf);
374 if (dest_exists && !is_empty_dir(dir))
375 die("destination path '%s' already exists and is not "
376 "an empty directory.", dir);
378 strbuf_addf(&reflog_msg, "clone: from %s", repo);
380 if (option_bare)
381 work_tree = NULL;
382 else {
383 work_tree = getenv("GIT_WORK_TREE");
384 if (work_tree && !stat(work_tree, &buf))
385 die("working tree '%s' already exists.", work_tree);
388 if (option_bare || work_tree)
389 git_dir = xstrdup(dir);
390 else {
391 work_tree = dir;
392 git_dir = xstrdup(mkpath("%s/.git", dir));
395 if (!option_bare) {
396 junk_work_tree = work_tree;
397 if (safe_create_leading_directories_const(work_tree) < 0)
398 die("could not create leading directories of '%s': %s",
399 work_tree, strerror(errno));
400 if (!dest_exists && mkdir(work_tree, 0755))
401 die("could not create work tree dir '%s': %s.",
402 work_tree, strerror(errno));
403 set_git_work_tree(work_tree);
405 junk_git_dir = git_dir;
406 atexit(remove_junk);
407 sigchain_push_common(remove_junk_on_signal);
409 setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1);
411 if (safe_create_leading_directories_const(git_dir) < 0)
412 die("could not create leading directories of '%s'", git_dir);
413 set_git_dir(make_absolute_path(git_dir));
415 init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
418 * At this point, the config exists, so we do not need the
419 * environment variable. We actually need to unset it, too, to
420 * re-enable parsing of the global configs.
422 unsetenv(CONFIG_ENVIRONMENT);
424 if (option_reference)
425 setup_reference(git_dir);
427 git_config(git_default_config, NULL);
429 if (option_bare) {
430 if (option_mirror)
431 src_ref_prefix = "refs/";
432 strbuf_addstr(&branch_top, src_ref_prefix);
434 git_config_set("core.bare", "true");
435 } else {
436 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
439 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
441 if (option_mirror || !option_bare) {
442 /* Configure the remote */
443 strbuf_addf(&key, "remote.%s.fetch", option_origin);
444 git_config_set_multivar(key.buf, value.buf, "^$", 0);
445 strbuf_reset(&key);
447 if (option_mirror) {
448 strbuf_addf(&key, "remote.%s.mirror", option_origin);
449 git_config_set(key.buf, "true");
450 strbuf_reset(&key);
453 strbuf_addf(&key, "remote.%s.url", option_origin);
454 git_config_set(key.buf, repo);
455 strbuf_reset(&key);
458 fetch_pattern = value.buf;
459 refspec = parse_fetch_refspec(1, &fetch_pattern);
461 strbuf_reset(&value);
463 if (path && !is_bundle)
464 refs = clone_local(path, git_dir);
465 else {
466 struct remote *remote = remote_get(argv[0]);
467 transport = transport_get(remote, remote->url[0]);
469 if (!transport->get_refs_list || !transport->fetch)
470 die("Don't know how to clone %s", transport->url);
472 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
474 if (option_depth)
475 transport_set_option(transport, TRANS_OPT_DEPTH,
476 option_depth);
478 if (option_quiet)
479 transport->verbose = -1;
480 else if (option_verbose)
481 transport->progress = 1;
483 if (option_upload_pack)
484 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
485 option_upload_pack);
487 refs = transport_get_remote_refs(transport);
488 if(refs)
489 transport_fetch_refs(transport, refs);
492 if (refs) {
493 clear_extra_refs();
495 mapped_refs = write_remote_refs(refs, refspec, reflog_msg.buf);
497 remote_head = find_ref_by_name(refs, "HEAD");
498 head_points_at = guess_remote_head(remote_head, mapped_refs, 0);
500 else {
501 warning("You appear to have cloned an empty repository.");
502 head_points_at = NULL;
503 remote_head = NULL;
504 option_no_checkout = 1;
505 if (!option_bare)
506 install_branch_config(0, "master", option_origin,
507 "refs/heads/master");
510 if (head_points_at) {
511 /* Local default branch link */
512 create_symref("HEAD", head_points_at->name, NULL);
514 if (!option_bare) {
515 struct strbuf head_ref = STRBUF_INIT;
516 const char *head = head_points_at->name;
518 if (!prefixcmp(head, "refs/heads/"))
519 head += 11;
521 /* Set up the initial local branch */
523 /* Local branch initial value */
524 update_ref(reflog_msg.buf, "HEAD",
525 head_points_at->old_sha1,
526 NULL, 0, DIE_ON_ERR);
528 strbuf_addstr(&head_ref, branch_top.buf);
529 strbuf_addstr(&head_ref, "HEAD");
531 /* Remote branch link */
532 create_symref(head_ref.buf,
533 head_points_at->peer_ref->name,
534 reflog_msg.buf);
536 install_branch_config(0, head, option_origin,
537 head_points_at->name);
539 } else if (remote_head) {
540 /* Source had detached HEAD pointing somewhere. */
541 if (!option_bare)
542 update_ref(reflog_msg.buf, "HEAD",
543 remote_head->old_sha1,
544 NULL, REF_NODEREF, DIE_ON_ERR);
545 } else {
546 /* Nothing to checkout out */
547 if (!option_no_checkout)
548 warning("remote HEAD refers to nonexistent ref, "
549 "unable to checkout.\n");
550 option_no_checkout = 1;
553 if (transport)
554 transport_unlock_pack(transport);
556 if (!option_no_checkout) {
557 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
558 struct unpack_trees_options opts;
559 struct tree *tree;
560 struct tree_desc t;
561 int fd;
563 /* We need to be in the new work tree for the checkout */
564 setup_work_tree();
566 fd = hold_locked_index(lock_file, 1);
568 memset(&opts, 0, sizeof opts);
569 opts.update = 1;
570 opts.merge = 1;
571 opts.fn = oneway_merge;
572 opts.verbose_update = !option_quiet;
573 opts.src_index = &the_index;
574 opts.dst_index = &the_index;
576 tree = parse_tree_indirect(remote_head->old_sha1);
577 parse_tree(tree);
578 init_tree_desc(&t, tree->buffer, tree->size);
579 unpack_trees(1, &t, &opts);
581 if (write_cache(fd, active_cache, active_nr) ||
582 commit_locked_index(lock_file))
583 die("unable to write new index file");
585 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
586 sha1_to_hex(remote_head->old_sha1), "1", NULL);
589 strbuf_release(&reflog_msg);
590 strbuf_release(&branch_top);
591 strbuf_release(&key);
592 strbuf_release(&value);
593 junk_pid = 0;
594 return err;