MinGW: truncate exit()'s argument to lowest 8 bits
[git/dscho.git] / builtin-clone.c
blob2ceacb7b3f34c78e64ed047833d8af5a061f065f
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;
107 char *dir;
110 * Strip trailing spaces, slashes and /.git
112 while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
113 end--;
114 if (end - repo > 5 && is_dir_sep(end[-5]) &&
115 !strncmp(end - 4, ".git", 4)) {
116 end -= 5;
117 while (repo < end && is_dir_sep(end[-1]))
118 end--;
122 * Find last component, but be prepared that repo could have
123 * the form "remote.example.com:foo.git", i.e. no slash
124 * in the directory part.
126 start = end;
127 while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
128 start--;
131 * Strip .{bundle,git}.
133 if (is_bundle) {
134 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
135 end -= 7;
136 } else {
137 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
138 end -= 4;
141 if (is_bare) {
142 struct strbuf result = STRBUF_INIT;
143 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
144 dir = strbuf_detach(&result, NULL);
145 } else
146 dir = xstrndup(start, end - start);
148 * Replace sequences of 'control' characters and whitespace
149 * with one ascii space, remove leading and trailing spaces.
151 if (*dir) {
152 char *out = dir;
153 int prev_space = 1 /* strip leading whitespace */;
154 for (end = dir; *end; ++end) {
155 char ch = *end;
156 if ((unsigned char)ch < '\x20')
157 ch = '\x20';
158 if (isspace(ch)) {
159 if (prev_space)
160 continue;
161 prev_space = 1;
162 } else
163 prev_space = 0;
164 *out++ = ch;
166 *out = '\0';
167 if (out > dir && prev_space)
168 out[-1] = '\0';
170 return dir;
173 static void strip_trailing_slashes(char *dir)
175 char *end = dir + strlen(dir);
177 while (dir < end - 1 && is_dir_sep(end[-1]))
178 end--;
179 *end = '\0';
182 static void setup_reference(const char *repo)
184 const char *ref_git;
185 char *ref_git_copy;
187 struct remote *remote;
188 struct transport *transport;
189 const struct ref *extra;
191 ref_git = make_absolute_path(option_reference);
193 if (is_directory(mkpath("%s/.git/objects", ref_git)))
194 ref_git = mkpath("%s/.git", ref_git);
195 else if (!is_directory(mkpath("%s/objects", ref_git)))
196 die("reference repository '%s' is not a local directory.",
197 option_reference);
199 ref_git_copy = xstrdup(ref_git);
201 add_to_alternates_file(ref_git_copy);
203 remote = remote_get(ref_git_copy);
204 transport = transport_get(remote, ref_git_copy);
205 for (extra = transport_get_remote_refs(transport); extra;
206 extra = extra->next)
207 add_extra_ref(extra->name, extra->old_sha1, 0);
209 transport_disconnect(transport);
211 free(ref_git_copy);
214 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
216 struct dirent *de;
217 struct stat buf;
218 int src_len, dest_len;
219 DIR *dir;
221 dir = opendir(src->buf);
222 if (!dir)
223 die("failed to open %s", src->buf);
225 if (mkdir(dest->buf, 0777)) {
226 if (errno != EEXIST)
227 die("failed to create directory %s", dest->buf);
228 else if (stat(dest->buf, &buf))
229 die("failed to stat %s", dest->buf);
230 else if (!S_ISDIR(buf.st_mode))
231 die("%s exists and is not a directory", dest->buf);
234 strbuf_addch(src, '/');
235 src_len = src->len;
236 strbuf_addch(dest, '/');
237 dest_len = dest->len;
239 while ((de = readdir(dir)) != NULL) {
240 strbuf_setlen(src, src_len);
241 strbuf_addstr(src, de->d_name);
242 strbuf_setlen(dest, dest_len);
243 strbuf_addstr(dest, de->d_name);
244 if (stat(src->buf, &buf)) {
245 warning ("failed to stat %s\n", src->buf);
246 continue;
248 if (S_ISDIR(buf.st_mode)) {
249 if (de->d_name[0] != '.')
250 copy_or_link_directory(src, dest);
251 continue;
254 if (unlink(dest->buf) && errno != ENOENT)
255 die("failed to unlink %s: %s",
256 dest->buf, strerror(errno));
257 if (!option_no_hardlinks) {
258 if (!link(src->buf, dest->buf))
259 continue;
260 if (option_local)
261 die("failed to create link %s", dest->buf);
262 option_no_hardlinks = 1;
264 if (copy_file(dest->buf, src->buf, 0666))
265 die("failed to copy file to %s", dest->buf);
267 closedir(dir);
270 static const struct ref *clone_local(const char *src_repo,
271 const char *dest_repo)
273 const struct ref *ret;
274 struct strbuf src = STRBUF_INIT;
275 struct strbuf dest = STRBUF_INIT;
276 struct remote *remote;
277 struct transport *transport;
279 if (option_shared)
280 add_to_alternates_file(src_repo);
281 else {
282 strbuf_addf(&src, "%s/objects", src_repo);
283 strbuf_addf(&dest, "%s/objects", dest_repo);
284 copy_or_link_directory(&src, &dest);
285 strbuf_release(&src);
286 strbuf_release(&dest);
289 remote = remote_get(src_repo);
290 transport = transport_get(remote, src_repo);
291 ret = transport_get_remote_refs(transport);
292 transport_disconnect(transport);
293 return ret;
296 static const char *junk_work_tree;
297 static const char *junk_git_dir;
298 static pid_t junk_pid;
300 static void remove_junk(void)
302 struct strbuf sb = STRBUF_INIT;
303 if (getpid() != junk_pid)
304 return;
305 if (junk_git_dir) {
306 strbuf_addstr(&sb, junk_git_dir);
307 remove_dir_recursively(&sb, 0);
308 strbuf_reset(&sb);
310 if (junk_work_tree) {
311 strbuf_addstr(&sb, junk_work_tree);
312 remove_dir_recursively(&sb, 0);
313 strbuf_reset(&sb);
317 static void remove_junk_on_signal(int signo)
319 remove_junk();
320 sigchain_pop(signo);
321 raise(signo);
324 static struct ref *write_remote_refs(const struct ref *refs,
325 struct refspec *refspec, const char *reflog)
327 struct ref *local_refs = NULL;
328 struct ref **tail = &local_refs;
329 struct ref *r;
331 get_fetch_map(refs, refspec, &tail, 0);
332 if (!option_mirror)
333 get_fetch_map(refs, tag_refspec, &tail, 0);
335 for (r = local_refs; r; r = r->next)
336 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
338 pack_refs(PACK_REFS_ALL);
339 clear_extra_refs();
341 return local_refs;
344 int cmd_clone(int argc, const char **argv, const char *prefix)
346 int is_bundle = 0;
347 struct stat buf;
348 const char *repo_name, *repo, *work_tree, *git_dir;
349 char *path, *dir;
350 int dest_exists;
351 const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
352 struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
353 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
354 struct transport *transport = NULL;
355 char *src_ref_prefix = "refs/heads/";
356 int err = 0;
358 struct refspec *refspec;
359 const char *fetch_pattern;
361 junk_pid = getpid();
363 argc = parse_options(argc, argv, prefix, builtin_clone_options,
364 builtin_clone_usage, 0);
366 if (argc == 0)
367 die("You must specify a repository to clone.");
369 if (option_mirror)
370 option_bare = 1;
372 if (option_bare) {
373 if (option_origin)
374 die("--bare and --origin %s options are incompatible.",
375 option_origin);
376 option_no_checkout = 1;
379 if (!option_origin)
380 option_origin = "origin";
382 repo_name = argv[0];
384 path = get_repo_path(repo_name, &is_bundle);
385 if (path)
386 repo = xstrdup(make_nonrelative_path(repo_name));
387 else if (!strchr(repo_name, ':'))
388 repo = xstrdup(make_absolute_path(repo_name));
389 else
390 repo = repo_name;
392 if (argc == 2)
393 dir = xstrdup(argv[1]);
394 else
395 dir = guess_dir_name(repo_name, is_bundle, option_bare);
396 strip_trailing_slashes(dir);
398 dest_exists = !stat(dir, &buf);
399 if (dest_exists && !is_empty_dir(dir))
400 die("destination path '%s' already exists and is not "
401 "an empty directory.", dir);
403 strbuf_addf(&reflog_msg, "clone: from %s", repo);
405 if (option_bare)
406 work_tree = NULL;
407 else {
408 work_tree = getenv("GIT_WORK_TREE");
409 if (work_tree && !stat(work_tree, &buf))
410 die("working tree '%s' already exists.", work_tree);
413 if (option_bare || work_tree)
414 git_dir = xstrdup(dir);
415 else {
416 work_tree = dir;
417 git_dir = xstrdup(mkpath("%s/.git", dir));
420 if (!option_bare) {
421 junk_work_tree = work_tree;
422 if (safe_create_leading_directories_const(work_tree) < 0)
423 die("could not create leading directories of '%s': %s",
424 work_tree, strerror(errno));
425 if (!dest_exists && mkdir(work_tree, 0755))
426 die("could not create work tree dir '%s': %s.",
427 work_tree, strerror(errno));
428 set_git_work_tree(work_tree);
430 junk_git_dir = git_dir;
431 atexit(remove_junk);
432 sigchain_push_common(remove_junk_on_signal);
434 setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
436 if (safe_create_leading_directories_const(git_dir) < 0)
437 die("could not create leading directories of '%s'", git_dir);
438 set_git_dir(make_absolute_path(git_dir));
440 init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
443 * At this point, the config exists, so we do not need the
444 * environment variable. We actually need to unset it, too, to
445 * re-enable parsing of the global configs.
447 unsetenv(CONFIG_ENVIRONMENT);
449 if (option_reference)
450 setup_reference(git_dir);
452 git_config(git_default_config, NULL);
454 if (option_bare) {
455 if (option_mirror)
456 src_ref_prefix = "refs/";
457 strbuf_addstr(&branch_top, src_ref_prefix);
459 git_config_set("core.bare", "true");
460 } else {
461 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
464 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
466 if (option_mirror || !option_bare) {
467 /* Configure the remote */
468 strbuf_addf(&key, "remote.%s.fetch", option_origin);
469 git_config_set_multivar(key.buf, value.buf, "^$", 0);
470 strbuf_reset(&key);
472 if (option_mirror) {
473 strbuf_addf(&key, "remote.%s.mirror", option_origin);
474 git_config_set(key.buf, "true");
475 strbuf_reset(&key);
478 strbuf_addf(&key, "remote.%s.url", option_origin);
479 git_config_set(key.buf, repo);
480 strbuf_reset(&key);
483 fetch_pattern = value.buf;
484 refspec = parse_fetch_refspec(1, &fetch_pattern);
486 strbuf_reset(&value);
488 if (path && !is_bundle)
489 refs = clone_local(path, git_dir);
490 else {
491 struct remote *remote = remote_get(argv[0]);
492 transport = transport_get(remote, remote->url[0]);
494 if (!transport->get_refs_list || !transport->fetch)
495 die("Don't know how to clone %s", transport->url);
497 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
499 if (option_depth)
500 transport_set_option(transport, TRANS_OPT_DEPTH,
501 option_depth);
503 if (option_quiet)
504 transport->verbose = -1;
505 else if (option_verbose)
506 transport->progress = 1;
508 if (option_upload_pack)
509 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
510 option_upload_pack);
512 refs = transport_get_remote_refs(transport);
513 if(refs)
514 transport_fetch_refs(transport, refs);
517 if (refs) {
518 clear_extra_refs();
520 mapped_refs = write_remote_refs(refs, refspec, reflog_msg.buf);
522 remote_head = find_ref_by_name(refs, "HEAD");
523 head_points_at = guess_remote_head(remote_head, mapped_refs, 0);
525 else {
526 warning("You appear to have cloned an empty repository.");
527 head_points_at = NULL;
528 remote_head = NULL;
529 option_no_checkout = 1;
530 if (!option_bare)
531 install_branch_config(0, "master", option_origin,
532 "refs/heads/master");
535 if (head_points_at) {
536 /* Local default branch link */
537 create_symref("HEAD", head_points_at->name, NULL);
539 if (!option_bare) {
540 struct strbuf head_ref = STRBUF_INIT;
541 const char *head = head_points_at->name;
543 if (!prefixcmp(head, "refs/heads/"))
544 head += 11;
546 /* Set up the initial local branch */
548 /* Local branch initial value */
549 update_ref(reflog_msg.buf, "HEAD",
550 head_points_at->old_sha1,
551 NULL, 0, DIE_ON_ERR);
553 strbuf_addstr(&head_ref, branch_top.buf);
554 strbuf_addstr(&head_ref, "HEAD");
556 /* Remote branch link */
557 create_symref(head_ref.buf,
558 head_points_at->peer_ref->name,
559 reflog_msg.buf);
561 install_branch_config(0, head, option_origin,
562 head_points_at->name);
564 } else if (remote_head) {
565 /* Source had detached HEAD pointing somewhere. */
566 if (!option_bare)
567 update_ref(reflog_msg.buf, "HEAD",
568 remote_head->old_sha1,
569 NULL, REF_NODEREF, DIE_ON_ERR);
570 } else {
571 /* Nothing to checkout out */
572 if (!option_no_checkout)
573 warning("remote HEAD refers to nonexistent ref, "
574 "unable to checkout.\n");
575 option_no_checkout = 1;
578 if (transport)
579 transport_unlock_pack(transport);
581 if (!option_no_checkout) {
582 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
583 struct unpack_trees_options opts;
584 struct tree *tree;
585 struct tree_desc t;
586 int fd;
588 /* We need to be in the new work tree for the checkout */
589 setup_work_tree();
591 fd = hold_locked_index(lock_file, 1);
593 memset(&opts, 0, sizeof opts);
594 opts.update = 1;
595 opts.merge = 1;
596 opts.fn = oneway_merge;
597 opts.verbose_update = !option_quiet;
598 opts.src_index = &the_index;
599 opts.dst_index = &the_index;
601 tree = parse_tree_indirect(remote_head->old_sha1);
602 parse_tree(tree);
603 init_tree_desc(&t, tree->buffer, tree->size);
604 unpack_trees(1, &t, &opts);
606 if (write_cache(fd, active_cache, active_nr) ||
607 commit_locked_index(lock_file))
608 die("unable to write new index file");
610 err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
611 sha1_to_hex(remote_head->old_sha1), "1", NULL);
614 strbuf_release(&reflog_msg);
615 strbuf_release(&branch_top);
616 strbuf_release(&key);
617 strbuf_release(&value);
618 junk_pid = 0;
619 return err;