Merge branch 'jk/negative-hiderefs'
[git/git.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 "lockfile.h"
13 #include "parse-options.h"
14 #include "fetch-pack.h"
15 #include "refs.h"
16 #include "tree.h"
17 #include "tree-walk.h"
18 #include "unpack-trees.h"
19 #include "transport.h"
20 #include "strbuf.h"
21 #include "dir.h"
22 #include "sigchain.h"
23 #include "branch.h"
24 #include "remote.h"
25 #include "run-command.h"
26 #include "connected.h"
27
28 /*
29 * Overall FIXMEs:
30 * - respect DB_ENVIRONMENT for .git/objects.
31 *
32 * Implementation notes:
33 * - dropping use-separate-remote and no-separate-remote compatibility
34 *
35 */
36 static const char * const builtin_clone_usage[] = {
37 N_("git clone [<options>] [--] <repo> [<dir>]"),
38 NULL
39 };
40
41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
43 static char *option_template, *option_depth;
44 static char *option_origin = NULL;
45 static char *option_branch = NULL;
46 static const char *real_git_dir;
47 static char *option_upload_pack = "git-upload-pack";
48 static int option_verbosity;
49 static int option_progress = -1;
50 static struct string_list option_config;
51 static struct string_list option_reference;
52 static int option_dissociate;
53
54 static struct option builtin_clone_options[] = {
55 OPT__VERBOSITY(&option_verbosity),
56 OPT_BOOL(0, "progress", &option_progress,
57 N_("force progress reporting")),
58 OPT_BOOL('n', "no-checkout", &option_no_checkout,
59 N_("don't create a checkout")),
60 OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
61 OPT_HIDDEN_BOOL(0, "naked", &option_bare,
62 N_("create a bare repository")),
63 OPT_BOOL(0, "mirror", &option_mirror,
64 N_("create a mirror repository (implies bare)")),
65 OPT_BOOL('l', "local", &option_local,
66 N_("to clone from a local repository")),
67 OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
68 N_("don't use local hardlinks, always copy")),
69 OPT_BOOL('s', "shared", &option_shared,
70 N_("setup as shared repository")),
71 OPT_BOOL(0, "recursive", &option_recursive,
72 N_("initialize submodules in the clone")),
73 OPT_BOOL(0, "recurse-submodules", &option_recursive,
74 N_("initialize submodules in the clone")),
75 OPT_STRING(0, "template", &option_template, N_("template-directory"),
76 N_("directory from which templates will be used")),
77 OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
78 N_("reference repository")),
79 OPT_BOOL(0, "dissociate", &option_dissociate,
80 N_("use --reference only while cloning")),
81 OPT_STRING('o', "origin", &option_origin, N_("name"),
82 N_("use <name> instead of 'origin' to track upstream")),
83 OPT_STRING('b', "branch", &option_branch, N_("branch"),
84 N_("checkout <branch> instead of the remote's HEAD")),
85 OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
86 N_("path to git-upload-pack on the remote")),
87 OPT_STRING(0, "depth", &option_depth, N_("depth"),
88 N_("create a shallow clone of that depth")),
89 OPT_BOOL(0, "single-branch", &option_single_branch,
90 N_("clone only one branch, HEAD or --branch")),
91 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
92 N_("separate git dir from working tree")),
93 OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
94 N_("set config inside the new repository")),
95 OPT_END()
96 };
97
98 static const char *argv_submodule[] = {
99 "submodule", "update", "--init", "--recursive", NULL
100 };
101
102 static char *get_repo_path(const char *repo, int *is_bundle)
103 {
104 static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
105 static char *bundle_suffix[] = { ".bundle", "" };
106 struct stat st;
107 int i;
108
109 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
110 const char *path;
111 path = mkpath("%s%s", repo, suffix[i]);
112 if (stat(path, &st))
113 continue;
114 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
115 *is_bundle = 0;
116 return xstrdup(absolute_path(path));
117 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
118 /* Is it a "gitfile"? */
119 char signature[8];
120 int len, fd = open(path, O_RDONLY);
121 if (fd < 0)
122 continue;
123 len = read_in_full(fd, signature, 8);
124 close(fd);
125 if (len != 8 || strncmp(signature, "gitdir: ", 8))
126 continue;
127 path = read_gitfile(path);
128 if (path) {
129 *is_bundle = 0;
130 return xstrdup(absolute_path(path));
131 }
132 }
133 }
134
135 for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
136 const char *path;
137 path = mkpath("%s%s", repo, bundle_suffix[i]);
138 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
139 *is_bundle = 1;
140 return xstrdup(absolute_path(path));
141 }
142 }
143
144 return NULL;
145 }
146
147 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
148 {
149 const char *end = repo + strlen(repo), *start;
150 size_t len;
151 char *dir;
152
153 /*
154 * Strip trailing spaces, slashes and /.git
155 */
156 while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
157 end--;
158 if (end - repo > 5 && is_dir_sep(end[-5]) &&
159 !strncmp(end - 4, ".git", 4)) {
160 end -= 5;
161 while (repo < end && is_dir_sep(end[-1]))
162 end--;
163 }
164
165 /*
166 * Find last component, but be prepared that repo could have
167 * the form "remote.example.com:foo.git", i.e. no slash
168 * in the directory part.
169 */
170 start = end;
171 while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
172 start--;
173
174 /*
175 * Strip .{bundle,git}.
176 */
177 strip_suffix(start, is_bundle ? ".bundle" : ".git" , &len);
178
179 if (is_bare)
180 dir = xstrfmt("%.*s.git", (int)len, start);
181 else
182 dir = xstrndup(start, len);
183 /*
184 * Replace sequences of 'control' characters and whitespace
185 * with one ascii space, remove leading and trailing spaces.
186 */
187 if (*dir) {
188 char *out = dir;
189 int prev_space = 1 /* strip leading whitespace */;
190 for (end = dir; *end; ++end) {
191 char ch = *end;
192 if ((unsigned char)ch < '\x20')
193 ch = '\x20';
194 if (isspace(ch)) {
195 if (prev_space)
196 continue;
197 prev_space = 1;
198 } else
199 prev_space = 0;
200 *out++ = ch;
201 }
202 *out = '\0';
203 if (out > dir && prev_space)
204 out[-1] = '\0';
205 }
206 return dir;
207 }
208
209 static void strip_trailing_slashes(char *dir)
210 {
211 char *end = dir + strlen(dir);
212
213 while (dir < end - 1 && is_dir_sep(end[-1]))
214 end--;
215 *end = '\0';
216 }
217
218 static int add_one_reference(struct string_list_item *item, void *cb_data)
219 {
220 char *ref_git;
221 const char *repo;
222 struct strbuf alternate = STRBUF_INIT;
223
224 /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
225 ref_git = xstrdup(real_path(item->string));
226
227 repo = read_gitfile(ref_git);
228 if (!repo)
229 repo = read_gitfile(mkpath("%s/.git", ref_git));
230 if (repo) {
231 free(ref_git);
232 ref_git = xstrdup(repo);
233 }
234
235 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
236 char *ref_git_git = mkpathdup("%s/.git", ref_git);
237 free(ref_git);
238 ref_git = ref_git_git;
239 } else if (!is_directory(mkpath("%s/objects", ref_git)))
240 die(_("reference repository '%s' is not a local repository."),
241 item->string);
242
243 if (!access(mkpath("%s/shallow", ref_git), F_OK))
244 die(_("reference repository '%s' is shallow"), item->string);
245
246 if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
247 die(_("reference repository '%s' is grafted"), item->string);
248
249 strbuf_addf(&alternate, "%s/objects", ref_git);
250 add_to_alternates_file(alternate.buf);
251 strbuf_release(&alternate);
252 free(ref_git);
253 return 0;
254 }
255
256 static void setup_reference(void)
257 {
258 for_each_string_list(&option_reference, add_one_reference, NULL);
259 }
260
261 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
262 const char *src_repo)
263 {
264 /*
265 * Read from the source objects/info/alternates file
266 * and copy the entries to corresponding file in the
267 * destination repository with add_to_alternates_file().
268 * Both src and dst have "$path/objects/info/alternates".
269 *
270 * Instead of copying bit-for-bit from the original,
271 * we need to append to existing one so that the already
272 * created entry via "clone -s" is not lost, and also
273 * to turn entries with paths relative to the original
274 * absolute, so that they can be used in the new repository.
275 */
276 FILE *in = fopen(src->buf, "r");
277 struct strbuf line = STRBUF_INIT;
278
279 while (strbuf_getline(&line, in, '\n') != EOF) {
280 char *abs_path;
281 if (!line.len || line.buf[0] == '#')
282 continue;
283 if (is_absolute_path(line.buf)) {
284 add_to_alternates_file(line.buf);
285 continue;
286 }
287 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
288 normalize_path_copy(abs_path, abs_path);
289 add_to_alternates_file(abs_path);
290 free(abs_path);
291 }
292 strbuf_release(&line);
293 fclose(in);
294 }
295
296 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
297 const char *src_repo, int src_baselen)
298 {
299 struct dirent *de;
300 struct stat buf;
301 int src_len, dest_len;
302 DIR *dir;
303
304 dir = opendir(src->buf);
305 if (!dir)
306 die_errno(_("failed to open '%s'"), src->buf);
307
308 if (mkdir(dest->buf, 0777)) {
309 if (errno != EEXIST)
310 die_errno(_("failed to create directory '%s'"), dest->buf);
311 else if (stat(dest->buf, &buf))
312 die_errno(_("failed to stat '%s'"), dest->buf);
313 else if (!S_ISDIR(buf.st_mode))
314 die(_("%s exists and is not a directory"), dest->buf);
315 }
316
317 strbuf_addch(src, '/');
318 src_len = src->len;
319 strbuf_addch(dest, '/');
320 dest_len = dest->len;
321
322 while ((de = readdir(dir)) != NULL) {
323 strbuf_setlen(src, src_len);
324 strbuf_addstr(src, de->d_name);
325 strbuf_setlen(dest, dest_len);
326 strbuf_addstr(dest, de->d_name);
327 if (stat(src->buf, &buf)) {
328 warning (_("failed to stat %s\n"), src->buf);
329 continue;
330 }
331 if (S_ISDIR(buf.st_mode)) {
332 if (de->d_name[0] != '.')
333 copy_or_link_directory(src, dest,
334 src_repo, src_baselen);
335 continue;
336 }
337
338 /* Files that cannot be copied bit-for-bit... */
339 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
340 copy_alternates(src, dest, src_repo);
341 continue;
342 }
343
344 if (unlink(dest->buf) && errno != ENOENT)
345 die_errno(_("failed to unlink '%s'"), dest->buf);
346 if (!option_no_hardlinks) {
347 if (!link(src->buf, dest->buf))
348 continue;
349 if (option_local > 0)
350 die_errno(_("failed to create link '%s'"), dest->buf);
351 option_no_hardlinks = 1;
352 }
353 if (copy_file_with_time(dest->buf, src->buf, 0666))
354 die_errno(_("failed to copy file to '%s'"), dest->buf);
355 }
356 closedir(dir);
357 }
358
359 static void clone_local(const char *src_repo, const char *dest_repo)
360 {
361 if (option_shared) {
362 struct strbuf alt = STRBUF_INIT;
363 strbuf_addf(&alt, "%s/objects", src_repo);
364 add_to_alternates_file(alt.buf);
365 strbuf_release(&alt);
366 } else {
367 struct strbuf src = STRBUF_INIT;
368 struct strbuf dest = STRBUF_INIT;
369 strbuf_addf(&src, "%s/objects", src_repo);
370 strbuf_addf(&dest, "%s/objects", dest_repo);
371 copy_or_link_directory(&src, &dest, src_repo, src.len);
372 strbuf_release(&src);
373 strbuf_release(&dest);
374 }
375
376 if (0 <= option_verbosity)
377 fprintf(stderr, _("done.\n"));
378 }
379
380 static const char *junk_work_tree;
381 static const char *junk_git_dir;
382 static enum {
383 JUNK_LEAVE_NONE,
384 JUNK_LEAVE_REPO,
385 JUNK_LEAVE_ALL
386 } junk_mode = JUNK_LEAVE_NONE;
387
388 static const char junk_leave_repo_msg[] =
389 N_("Clone succeeded, but checkout failed.\n"
390 "You can inspect what was checked out with 'git status'\n"
391 "and retry the checkout with 'git checkout -f HEAD'\n");
392
393 static void remove_junk(void)
394 {
395 struct strbuf sb = STRBUF_INIT;
396
397 switch (junk_mode) {
398 case JUNK_LEAVE_REPO:
399 warning("%s", _(junk_leave_repo_msg));
400 /* fall-through */
401 case JUNK_LEAVE_ALL:
402 return;
403 default:
404 /* proceed to removal */
405 break;
406 }
407
408 if (junk_git_dir) {
409 strbuf_addstr(&sb, junk_git_dir);
410 remove_dir_recursively(&sb, 0);
411 strbuf_reset(&sb);
412 }
413 if (junk_work_tree) {
414 strbuf_addstr(&sb, junk_work_tree);
415 remove_dir_recursively(&sb, 0);
416 strbuf_reset(&sb);
417 }
418 }
419
420 static void remove_junk_on_signal(int signo)
421 {
422 remove_junk();
423 sigchain_pop(signo);
424 raise(signo);
425 }
426
427 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
428 {
429 struct ref *ref;
430 struct strbuf head = STRBUF_INIT;
431 strbuf_addstr(&head, "refs/heads/");
432 strbuf_addstr(&head, branch);
433 ref = find_ref_by_name(refs, head.buf);
434 strbuf_release(&head);
435
436 if (ref)
437 return ref;
438
439 strbuf_addstr(&head, "refs/tags/");
440 strbuf_addstr(&head, branch);
441 ref = find_ref_by_name(refs, head.buf);
442 strbuf_release(&head);
443
444 return ref;
445 }
446
447 static struct ref *wanted_peer_refs(const struct ref *refs,
448 struct refspec *refspec)
449 {
450 struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
451 struct ref *local_refs = head;
452 struct ref **tail = head ? &head->next : &local_refs;
453
454 if (option_single_branch) {
455 struct ref *remote_head = NULL;
456
457 if (!option_branch)
458 remote_head = guess_remote_head(head, refs, 0);
459 else {
460 local_refs = NULL;
461 tail = &local_refs;
462 remote_head = copy_ref(find_remote_branch(refs, option_branch));
463 }
464
465 if (!remote_head && option_branch)
466 warning(_("Could not find remote branch %s to clone."),
467 option_branch);
468 else {
469 get_fetch_map(remote_head, refspec, &tail, 0);
470
471 /* if --branch=tag, pull the requested tag explicitly */
472 get_fetch_map(remote_head, tag_refspec, &tail, 0);
473 }
474 } else
475 get_fetch_map(refs, refspec, &tail, 0);
476
477 if (!option_mirror && !option_single_branch)
478 get_fetch_map(refs, tag_refspec, &tail, 0);
479
480 return local_refs;
481 }
482
483 static void write_remote_refs(const struct ref *local_refs)
484 {
485 const struct ref *r;
486
487 struct ref_transaction *t;
488 struct strbuf err = STRBUF_INIT;
489
490 t = ref_transaction_begin(&err);
491 if (!t)
492 die("%s", err.buf);
493
494 for (r = local_refs; r; r = r->next) {
495 if (!r->peer_ref)
496 continue;
497 if (ref_transaction_create(t, r->peer_ref->name, r->old_sha1,
498 0, NULL, &err))
499 die("%s", err.buf);
500 }
501
502 if (initial_ref_transaction_commit(t, &err))
503 die("%s", err.buf);
504
505 strbuf_release(&err);
506 ref_transaction_free(t);
507 }
508
509 static void write_followtags(const struct ref *refs, const char *msg)
510 {
511 const struct ref *ref;
512 for (ref = refs; ref; ref = ref->next) {
513 if (!starts_with(ref->name, "refs/tags/"))
514 continue;
515 if (ends_with(ref->name, "^{}"))
516 continue;
517 if (!has_sha1_file(ref->old_sha1))
518 continue;
519 update_ref(msg, ref->name, ref->old_sha1,
520 NULL, 0, UPDATE_REFS_DIE_ON_ERR);
521 }
522 }
523
524 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
525 {
526 struct ref **rm = cb_data;
527 struct ref *ref = *rm;
528
529 /*
530 * Skip anything missing a peer_ref, which we are not
531 * actually going to write a ref for.
532 */
533 while (ref && !ref->peer_ref)
534 ref = ref->next;
535 /* Returning -1 notes "end of list" to the caller. */
536 if (!ref)
537 return -1;
538
539 hashcpy(sha1, ref->old_sha1);
540 *rm = ref->next;
541 return 0;
542 }
543
544 static void update_remote_refs(const struct ref *refs,
545 const struct ref *mapped_refs,
546 const struct ref *remote_head_points_at,
547 const char *branch_top,
548 const char *msg,
549 struct transport *transport,
550 int check_connectivity)
551 {
552 const struct ref *rm = mapped_refs;
553
554 if (check_connectivity) {
555 if (transport->progress)
556 fprintf(stderr, _("Checking connectivity... "));
557 if (check_everything_connected_with_transport(iterate_ref_map,
558 0, &rm, transport))
559 die(_("remote did not send all necessary objects"));
560 if (transport->progress)
561 fprintf(stderr, _("done.\n"));
562 }
563
564 if (refs) {
565 write_remote_refs(mapped_refs);
566 if (option_single_branch)
567 write_followtags(refs, msg);
568 }
569
570 if (remote_head_points_at && !option_bare) {
571 struct strbuf head_ref = STRBUF_INIT;
572 strbuf_addstr(&head_ref, branch_top);
573 strbuf_addstr(&head_ref, "HEAD");
574 create_symref(head_ref.buf,
575 remote_head_points_at->peer_ref->name,
576 msg);
577 }
578 }
579
580 static void update_head(const struct ref *our, const struct ref *remote,
581 const char *msg)
582 {
583 const char *head;
584 if (our && skip_prefix(our->name, "refs/heads/", &head)) {
585 /* Local default branch link */
586 create_symref("HEAD", our->name, NULL);
587 if (!option_bare) {
588 update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
589 UPDATE_REFS_DIE_ON_ERR);
590 install_branch_config(0, head, option_origin, our->name);
591 }
592 } else if (our) {
593 struct commit *c = lookup_commit_reference(our->old_sha1);
594 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
595 update_ref(msg, "HEAD", c->object.sha1,
596 NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
597 } else if (remote) {
598 /*
599 * We know remote HEAD points to a non-branch, or
600 * HEAD points to a branch but we don't know which one.
601 * Detach HEAD in all these cases.
602 */
603 update_ref(msg, "HEAD", remote->old_sha1,
604 NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
605 }
606 }
607
608 static int checkout(void)
609 {
610 unsigned char sha1[20];
611 char *head;
612 struct lock_file *lock_file;
613 struct unpack_trees_options opts;
614 struct tree *tree;
615 struct tree_desc t;
616 int err = 0;
617
618 if (option_no_checkout)
619 return 0;
620
621 head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
622 if (!head) {
623 warning(_("remote HEAD refers to nonexistent ref, "
624 "unable to checkout.\n"));
625 return 0;
626 }
627 if (!strcmp(head, "HEAD")) {
628 if (advice_detached_head)
629 detach_advice(sha1_to_hex(sha1));
630 } else {
631 if (!starts_with(head, "refs/heads/"))
632 die(_("HEAD not found below refs/heads!"));
633 }
634 free(head);
635
636 /* We need to be in the new work tree for the checkout */
637 setup_work_tree();
638
639 lock_file = xcalloc(1, sizeof(struct lock_file));
640 hold_locked_index(lock_file, 1);
641
642 memset(&opts, 0, sizeof opts);
643 opts.update = 1;
644 opts.merge = 1;
645 opts.fn = oneway_merge;
646 opts.verbose_update = (option_verbosity >= 0);
647 opts.src_index = &the_index;
648 opts.dst_index = &the_index;
649
650 tree = parse_tree_indirect(sha1);
651 parse_tree(tree);
652 init_tree_desc(&t, tree->buffer, tree->size);
653 if (unpack_trees(1, &t, &opts) < 0)
654 die(_("unable to checkout working tree"));
655
656 if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
657 die(_("unable to write new index file"));
658
659 err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
660 sha1_to_hex(sha1), "1", NULL);
661
662 if (!err && option_recursive)
663 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
664
665 return err;
666 }
667
668 static int write_one_config(const char *key, const char *value, void *data)
669 {
670 return git_config_set_multivar(key, value ? value : "true", "^$", 0);
671 }
672
673 static void write_config(struct string_list *config)
674 {
675 int i;
676
677 for (i = 0; i < config->nr; i++) {
678 if (git_config_parse_parameter(config->items[i].string,
679 write_one_config, NULL) < 0)
680 die("unable to write parameters to config file");
681 }
682 }
683
684 static void write_refspec_config(const char *src_ref_prefix,
685 const struct ref *our_head_points_at,
686 const struct ref *remote_head_points_at,
687 struct strbuf *branch_top)
688 {
689 struct strbuf key = STRBUF_INIT;
690 struct strbuf value = STRBUF_INIT;
691
692 if (option_mirror || !option_bare) {
693 if (option_single_branch && !option_mirror) {
694 if (option_branch) {
695 if (starts_with(our_head_points_at->name, "refs/tags/"))
696 strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
697 our_head_points_at->name);
698 else
699 strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
700 branch_top->buf, option_branch);
701 } else if (remote_head_points_at) {
702 const char *head = remote_head_points_at->name;
703 if (!skip_prefix(head, "refs/heads/", &head))
704 die("BUG: remote HEAD points at non-head?");
705
706 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
707 branch_top->buf, head);
708 }
709 /*
710 * otherwise, the next "git fetch" will
711 * simply fetch from HEAD without updating
712 * any remote-tracking branch, which is what
713 * we want.
714 */
715 } else {
716 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
717 }
718 /* Configure the remote */
719 if (value.len) {
720 strbuf_addf(&key, "remote.%s.fetch", option_origin);
721 git_config_set_multivar(key.buf, value.buf, "^$", 0);
722 strbuf_reset(&key);
723
724 if (option_mirror) {
725 strbuf_addf(&key, "remote.%s.mirror", option_origin);
726 git_config_set(key.buf, "true");
727 strbuf_reset(&key);
728 }
729 }
730 }
731
732 strbuf_release(&key);
733 strbuf_release(&value);
734 }
735
736 static void dissociate_from_references(void)
737 {
738 static const char* argv[] = { "repack", "-a", "-d", NULL };
739
740 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
741 die(_("cannot repack to clean up"));
742 if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
743 die_errno(_("cannot unlink temporary alternates file"));
744 }
745
746 int cmd_clone(int argc, const char **argv, const char *prefix)
747 {
748 int is_bundle = 0, is_local;
749 struct stat buf;
750 const char *repo_name, *repo, *work_tree, *git_dir;
751 char *path, *dir;
752 int dest_exists;
753 const struct ref *refs, *remote_head;
754 const struct ref *remote_head_points_at;
755 const struct ref *our_head_points_at;
756 struct ref *mapped_refs;
757 const struct ref *ref;
758 struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
759 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
760 struct transport *transport = NULL;
761 const char *src_ref_prefix = "refs/heads/";
762 struct remote *remote;
763 int err = 0, complete_refs_before_fetch = 1;
764
765 struct refspec *refspec;
766 const char *fetch_pattern;
767
768 packet_trace_identity("clone");
769 argc = parse_options(argc, argv, prefix, builtin_clone_options,
770 builtin_clone_usage, 0);
771
772 if (argc > 2)
773 usage_msg_opt(_("Too many arguments."),
774 builtin_clone_usage, builtin_clone_options);
775
776 if (argc == 0)
777 usage_msg_opt(_("You must specify a repository to clone."),
778 builtin_clone_usage, builtin_clone_options);
779
780 if (option_single_branch == -1)
781 option_single_branch = option_depth ? 1 : 0;
782
783 if (option_mirror)
784 option_bare = 1;
785
786 if (option_bare) {
787 if (option_origin)
788 die(_("--bare and --origin %s options are incompatible."),
789 option_origin);
790 if (real_git_dir)
791 die(_("--bare and --separate-git-dir are incompatible."));
792 option_no_checkout = 1;
793 }
794
795 if (!option_origin)
796 option_origin = "origin";
797
798 repo_name = argv[0];
799
800 path = get_repo_path(repo_name, &is_bundle);
801 if (path)
802 repo = xstrdup(absolute_path(repo_name));
803 else if (!strchr(repo_name, ':'))
804 die(_("repository '%s' does not exist"), repo_name);
805 else
806 repo = repo_name;
807
808 /* no need to be strict, transport_set_option() will validate it again */
809 if (option_depth && atoi(option_depth) < 1)
810 die(_("depth %s is not a positive number"), option_depth);
811
812 if (argc == 2)
813 dir = xstrdup(argv[1]);
814 else
815 dir = guess_dir_name(repo_name, is_bundle, option_bare);
816 strip_trailing_slashes(dir);
817
818 dest_exists = !stat(dir, &buf);
819 if (dest_exists && !is_empty_dir(dir))
820 die(_("destination path '%s' already exists and is not "
821 "an empty directory."), dir);
822
823 strbuf_addf(&reflog_msg, "clone: from %s", repo);
824
825 if (option_bare)
826 work_tree = NULL;
827 else {
828 work_tree = getenv("GIT_WORK_TREE");
829 if (work_tree && !stat(work_tree, &buf))
830 die(_("working tree '%s' already exists."), work_tree);
831 }
832
833 if (option_bare || work_tree)
834 git_dir = xstrdup(dir);
835 else {
836 work_tree = dir;
837 git_dir = mkpathdup("%s/.git", dir);
838 }
839
840 atexit(remove_junk);
841 sigchain_push_common(remove_junk_on_signal);
842
843 if (!option_bare) {
844 if (safe_create_leading_directories_const(work_tree) < 0)
845 die_errno(_("could not create leading directories of '%s'"),
846 work_tree);
847 if (!dest_exists && mkdir(work_tree, 0777))
848 die_errno(_("could not create work tree dir '%s'"),
849 work_tree);
850 junk_work_tree = work_tree;
851 set_git_work_tree(work_tree);
852 }
853
854 junk_git_dir = git_dir;
855 if (safe_create_leading_directories_const(git_dir) < 0)
856 die(_("could not create leading directories of '%s'"), git_dir);
857
858 set_git_dir_init(git_dir, real_git_dir, 0);
859 if (real_git_dir) {
860 git_dir = real_git_dir;
861 junk_git_dir = real_git_dir;
862 }
863
864 if (0 <= option_verbosity) {
865 if (option_bare)
866 fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
867 else
868 fprintf(stderr, _("Cloning into '%s'...\n"), dir);
869 }
870 init_db(option_template, INIT_DB_QUIET);
871 write_config(&option_config);
872
873 git_config(git_default_config, NULL);
874
875 if (option_bare) {
876 if (option_mirror)
877 src_ref_prefix = "refs/";
878 strbuf_addstr(&branch_top, src_ref_prefix);
879
880 git_config_set("core.bare", "true");
881 } else {
882 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
883 }
884
885 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
886 strbuf_addf(&key, "remote.%s.url", option_origin);
887 git_config_set(key.buf, repo);
888 strbuf_reset(&key);
889
890 if (option_reference.nr)
891 setup_reference();
892 else if (option_dissociate) {
893 warning(_("--dissociate given, but there is no --reference"));
894 option_dissociate = 0;
895 }
896
897 fetch_pattern = value.buf;
898 refspec = parse_fetch_refspec(1, &fetch_pattern);
899
900 strbuf_reset(&value);
901
902 remote = remote_get(option_origin);
903 transport = transport_get(remote, remote->url[0]);
904 transport_set_verbosity(transport, option_verbosity, option_progress);
905
906 path = get_repo_path(remote->url[0], &is_bundle);
907 is_local = option_local != 0 && path && !is_bundle;
908 if (is_local) {
909 if (option_depth)
910 warning(_("--depth is ignored in local clones; use file:// instead."));
911 if (!access(mkpath("%s/shallow", path), F_OK)) {
912 if (option_local > 0)
913 warning(_("source repository is shallow, ignoring --local"));
914 is_local = 0;
915 }
916 }
917 if (option_local > 0 && !is_local)
918 warning(_("--local is ignored"));
919 transport->cloning = 1;
920
921 if (!transport->get_refs_list || (!is_local && !transport->fetch))
922 die(_("Don't know how to clone %s"), transport->url);
923
924 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
925
926 if (option_depth)
927 transport_set_option(transport, TRANS_OPT_DEPTH,
928 option_depth);
929 if (option_single_branch)
930 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
931
932 if (option_upload_pack)
933 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
934 option_upload_pack);
935
936 if (transport->smart_options && !option_depth)
937 transport->smart_options->check_self_contained_and_connected = 1;
938
939 refs = transport_get_remote_refs(transport);
940
941 if (refs) {
942 mapped_refs = wanted_peer_refs(refs, refspec);
943 /*
944 * transport_get_remote_refs() may return refs with null sha-1
945 * in mapped_refs (see struct transport->get_refs_list
946 * comment). In that case we need fetch it early because
947 * remote_head code below relies on it.
948 *
949 * for normal clones, transport_get_remote_refs() should
950 * return reliable ref set, we can delay cloning until after
951 * remote HEAD check.
952 */
953 for (ref = refs; ref; ref = ref->next)
954 if (is_null_sha1(ref->old_sha1)) {
955 complete_refs_before_fetch = 0;
956 break;
957 }
958
959 if (!is_local && !complete_refs_before_fetch)
960 transport_fetch_refs(transport, mapped_refs);
961
962 remote_head = find_ref_by_name(refs, "HEAD");
963 remote_head_points_at =
964 guess_remote_head(remote_head, mapped_refs, 0);
965
966 if (option_branch) {
967 our_head_points_at =
968 find_remote_branch(mapped_refs, option_branch);
969
970 if (!our_head_points_at)
971 die(_("Remote branch %s not found in upstream %s"),
972 option_branch, option_origin);
973 }
974 else
975 our_head_points_at = remote_head_points_at;
976 }
977 else {
978 if (option_branch)
979 die(_("Remote branch %s not found in upstream %s"),
980 option_branch, option_origin);
981
982 warning(_("You appear to have cloned an empty repository."));
983 mapped_refs = NULL;
984 our_head_points_at = NULL;
985 remote_head_points_at = NULL;
986 remote_head = NULL;
987 option_no_checkout = 1;
988 if (!option_bare)
989 install_branch_config(0, "master", option_origin,
990 "refs/heads/master");
991 }
992
993 write_refspec_config(src_ref_prefix, our_head_points_at,
994 remote_head_points_at, &branch_top);
995
996 if (is_local)
997 clone_local(path, git_dir);
998 else if (refs && complete_refs_before_fetch)
999 transport_fetch_refs(transport, mapped_refs);
1000
1001 update_remote_refs(refs, mapped_refs, remote_head_points_at,
1002 branch_top.buf, reflog_msg.buf, transport, !is_local);
1003
1004 update_head(our_head_points_at, remote_head, reflog_msg.buf);
1005
1006 transport_unlock_pack(transport);
1007 transport_disconnect(transport);
1008
1009 if (option_dissociate)
1010 dissociate_from_references();
1011
1012 junk_mode = JUNK_LEAVE_REPO;
1013 err = checkout();
1014
1015 strbuf_release(&reflog_msg);
1016 strbuf_release(&branch_top);
1017 strbuf_release(&key);
1018 strbuf_release(&value);
1019 junk_mode = JUNK_LEAVE_ALL;
1020
1021 free(refspec);
1022 return err;
1023 }