Merge branch 'sg/lock-file-commit-error' into maint
[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 const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
103 {
104 static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
105 static char *bundle_suffix[] = { ".bundle", "" };
106 size_t baselen = path->len;
107 struct stat st;
108 int i;
109
110 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
111 strbuf_setlen(path, baselen);
112 strbuf_addstr(path, suffix[i]);
113 if (stat(path->buf, &st))
114 continue;
115 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
116 *is_bundle = 0;
117 return path->buf;
118 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
119 /* Is it a "gitfile"? */
120 char signature[8];
121 const char *dst;
122 int len, fd = open(path->buf, O_RDONLY);
123 if (fd < 0)
124 continue;
125 len = read_in_full(fd, signature, 8);
126 close(fd);
127 if (len != 8 || strncmp(signature, "gitdir: ", 8))
128 continue;
129 dst = read_gitfile(path->buf);
130 if (dst) {
131 *is_bundle = 0;
132 return dst;
133 }
134 }
135 }
136
137 for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
138 strbuf_setlen(path, baselen);
139 strbuf_addstr(path, bundle_suffix[i]);
140 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
141 *is_bundle = 1;
142 return path->buf;
143 }
144 }
145
146 return NULL;
147 }
148
149 static char *get_repo_path(const char *repo, int *is_bundle)
150 {
151 struct strbuf path = STRBUF_INIT;
152 const char *raw;
153 char *canon;
154
155 strbuf_addstr(&path, repo);
156 raw = get_repo_path_1(&path, is_bundle);
157 canon = raw ? xstrdup(absolute_path(raw)) : NULL;
158 strbuf_release(&path);
159 return canon;
160 }
161
162 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
163 {
164 const char *end = repo + strlen(repo), *start, *ptr;
165 size_t len;
166 char *dir;
167
168 /*
169 * Skip scheme.
170 */
171 start = strstr(repo, "://");
172 if (start == NULL)
173 start = repo;
174 else
175 start += 3;
176
177 /*
178 * Skip authentication data. The stripping does happen
179 * greedily, such that we strip up to the last '@' inside
180 * the host part.
181 */
182 for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
183 if (*ptr == '@')
184 start = ptr + 1;
185 }
186
187 /*
188 * Strip trailing spaces, slashes and /.git
189 */
190 while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
191 end--;
192 if (end - start > 5 && is_dir_sep(end[-5]) &&
193 !strncmp(end - 4, ".git", 4)) {
194 end -= 5;
195 while (start < end && is_dir_sep(end[-1]))
196 end--;
197 }
198
199 /*
200 * Strip trailing port number if we've got only a
201 * hostname (that is, there is no dir separator but a
202 * colon). This check is required such that we do not
203 * strip URI's like '/foo/bar:2222.git', which should
204 * result in a dir '2222' being guessed due to backwards
205 * compatibility.
206 */
207 if (memchr(start, '/', end - start) == NULL
208 && memchr(start, ':', end - start) != NULL) {
209 ptr = end;
210 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
211 ptr--;
212 if (start < ptr && ptr[-1] == ':')
213 end = ptr - 1;
214 }
215
216 /*
217 * Find last component. To remain backwards compatible we
218 * also regard colons as path separators, such that
219 * cloning a repository 'foo:bar.git' would result in a
220 * directory 'bar' being guessed.
221 */
222 ptr = end;
223 while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
224 ptr--;
225 start = ptr;
226
227 /*
228 * Strip .{bundle,git}.
229 */
230 len = end - start;
231 strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
232
233 if (!len || (len == 1 && *start == '/'))
234 die("No directory name could be guessed.\n"
235 "Please specify a directory on the command line");
236
237 if (is_bare)
238 dir = xstrfmt("%.*s.git", (int)len, start);
239 else
240 dir = xstrndup(start, len);
241 /*
242 * Replace sequences of 'control' characters and whitespace
243 * with one ascii space, remove leading and trailing spaces.
244 */
245 if (*dir) {
246 char *out = dir;
247 int prev_space = 1 /* strip leading whitespace */;
248 for (end = dir; *end; ++end) {
249 char ch = *end;
250 if ((unsigned char)ch < '\x20')
251 ch = '\x20';
252 if (isspace(ch)) {
253 if (prev_space)
254 continue;
255 prev_space = 1;
256 } else
257 prev_space = 0;
258 *out++ = ch;
259 }
260 *out = '\0';
261 if (out > dir && prev_space)
262 out[-1] = '\0';
263 }
264 return dir;
265 }
266
267 static void strip_trailing_slashes(char *dir)
268 {
269 char *end = dir + strlen(dir);
270
271 while (dir < end - 1 && is_dir_sep(end[-1]))
272 end--;
273 *end = '\0';
274 }
275
276 static int add_one_reference(struct string_list_item *item, void *cb_data)
277 {
278 char *ref_git;
279 const char *repo;
280 struct strbuf alternate = STRBUF_INIT;
281
282 /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
283 ref_git = xstrdup(real_path(item->string));
284
285 repo = read_gitfile(ref_git);
286 if (!repo)
287 repo = read_gitfile(mkpath("%s/.git", ref_git));
288 if (repo) {
289 free(ref_git);
290 ref_git = xstrdup(repo);
291 }
292
293 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
294 char *ref_git_git = mkpathdup("%s/.git", ref_git);
295 free(ref_git);
296 ref_git = ref_git_git;
297 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
298 struct strbuf sb = STRBUF_INIT;
299 if (get_common_dir(&sb, ref_git))
300 die(_("reference repository '%s' as a linked checkout is not supported yet."),
301 item->string);
302 die(_("reference repository '%s' is not a local repository."),
303 item->string);
304 }
305
306 if (!access(mkpath("%s/shallow", ref_git), F_OK))
307 die(_("reference repository '%s' is shallow"), item->string);
308
309 if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
310 die(_("reference repository '%s' is grafted"), item->string);
311
312 strbuf_addf(&alternate, "%s/objects", ref_git);
313 add_to_alternates_file(alternate.buf);
314 strbuf_release(&alternate);
315 free(ref_git);
316 return 0;
317 }
318
319 static void setup_reference(void)
320 {
321 for_each_string_list(&option_reference, add_one_reference, NULL);
322 }
323
324 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
325 const char *src_repo)
326 {
327 /*
328 * Read from the source objects/info/alternates file
329 * and copy the entries to corresponding file in the
330 * destination repository with add_to_alternates_file().
331 * Both src and dst have "$path/objects/info/alternates".
332 *
333 * Instead of copying bit-for-bit from the original,
334 * we need to append to existing one so that the already
335 * created entry via "clone -s" is not lost, and also
336 * to turn entries with paths relative to the original
337 * absolute, so that they can be used in the new repository.
338 */
339 FILE *in = fopen(src->buf, "r");
340 struct strbuf line = STRBUF_INIT;
341
342 while (strbuf_getline(&line, in, '\n') != EOF) {
343 char *abs_path;
344 if (!line.len || line.buf[0] == '#')
345 continue;
346 if (is_absolute_path(line.buf)) {
347 add_to_alternates_file(line.buf);
348 continue;
349 }
350 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
351 normalize_path_copy(abs_path, abs_path);
352 add_to_alternates_file(abs_path);
353 free(abs_path);
354 }
355 strbuf_release(&line);
356 fclose(in);
357 }
358
359 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
360 const char *src_repo, int src_baselen)
361 {
362 struct dirent *de;
363 struct stat buf;
364 int src_len, dest_len;
365 DIR *dir;
366
367 dir = opendir(src->buf);
368 if (!dir)
369 die_errno(_("failed to open '%s'"), src->buf);
370
371 if (mkdir(dest->buf, 0777)) {
372 if (errno != EEXIST)
373 die_errno(_("failed to create directory '%s'"), dest->buf);
374 else if (stat(dest->buf, &buf))
375 die_errno(_("failed to stat '%s'"), dest->buf);
376 else if (!S_ISDIR(buf.st_mode))
377 die(_("%s exists and is not a directory"), dest->buf);
378 }
379
380 strbuf_addch(src, '/');
381 src_len = src->len;
382 strbuf_addch(dest, '/');
383 dest_len = dest->len;
384
385 while ((de = readdir(dir)) != NULL) {
386 strbuf_setlen(src, src_len);
387 strbuf_addstr(src, de->d_name);
388 strbuf_setlen(dest, dest_len);
389 strbuf_addstr(dest, de->d_name);
390 if (stat(src->buf, &buf)) {
391 warning (_("failed to stat %s\n"), src->buf);
392 continue;
393 }
394 if (S_ISDIR(buf.st_mode)) {
395 if (de->d_name[0] != '.')
396 copy_or_link_directory(src, dest,
397 src_repo, src_baselen);
398 continue;
399 }
400
401 /* Files that cannot be copied bit-for-bit... */
402 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
403 copy_alternates(src, dest, src_repo);
404 continue;
405 }
406
407 if (unlink(dest->buf) && errno != ENOENT)
408 die_errno(_("failed to unlink '%s'"), dest->buf);
409 if (!option_no_hardlinks) {
410 if (!link(src->buf, dest->buf))
411 continue;
412 if (option_local > 0)
413 die_errno(_("failed to create link '%s'"), dest->buf);
414 option_no_hardlinks = 1;
415 }
416 if (copy_file_with_time(dest->buf, src->buf, 0666))
417 die_errno(_("failed to copy file to '%s'"), dest->buf);
418 }
419 closedir(dir);
420 }
421
422 static void clone_local(const char *src_repo, const char *dest_repo)
423 {
424 if (option_shared) {
425 struct strbuf alt = STRBUF_INIT;
426 strbuf_addf(&alt, "%s/objects", src_repo);
427 add_to_alternates_file(alt.buf);
428 strbuf_release(&alt);
429 } else {
430 struct strbuf src = STRBUF_INIT;
431 struct strbuf dest = STRBUF_INIT;
432 get_common_dir(&src, src_repo);
433 get_common_dir(&dest, dest_repo);
434 strbuf_addstr(&src, "/objects");
435 strbuf_addstr(&dest, "/objects");
436 copy_or_link_directory(&src, &dest, src_repo, src.len);
437 strbuf_release(&src);
438 strbuf_release(&dest);
439 }
440
441 if (0 <= option_verbosity)
442 fprintf(stderr, _("done.\n"));
443 }
444
445 static const char *junk_work_tree;
446 static const char *junk_git_dir;
447 static enum {
448 JUNK_LEAVE_NONE,
449 JUNK_LEAVE_REPO,
450 JUNK_LEAVE_ALL
451 } junk_mode = JUNK_LEAVE_NONE;
452
453 static const char junk_leave_repo_msg[] =
454 N_("Clone succeeded, but checkout failed.\n"
455 "You can inspect what was checked out with 'git status'\n"
456 "and retry the checkout with 'git checkout -f HEAD'\n");
457
458 static void remove_junk(void)
459 {
460 struct strbuf sb = STRBUF_INIT;
461
462 switch (junk_mode) {
463 case JUNK_LEAVE_REPO:
464 warning("%s", _(junk_leave_repo_msg));
465 /* fall-through */
466 case JUNK_LEAVE_ALL:
467 return;
468 default:
469 /* proceed to removal */
470 break;
471 }
472
473 if (junk_git_dir) {
474 strbuf_addstr(&sb, junk_git_dir);
475 remove_dir_recursively(&sb, 0);
476 strbuf_reset(&sb);
477 }
478 if (junk_work_tree) {
479 strbuf_addstr(&sb, junk_work_tree);
480 remove_dir_recursively(&sb, 0);
481 strbuf_reset(&sb);
482 }
483 }
484
485 static void remove_junk_on_signal(int signo)
486 {
487 remove_junk();
488 sigchain_pop(signo);
489 raise(signo);
490 }
491
492 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
493 {
494 struct ref *ref;
495 struct strbuf head = STRBUF_INIT;
496 strbuf_addstr(&head, "refs/heads/");
497 strbuf_addstr(&head, branch);
498 ref = find_ref_by_name(refs, head.buf);
499 strbuf_release(&head);
500
501 if (ref)
502 return ref;
503
504 strbuf_addstr(&head, "refs/tags/");
505 strbuf_addstr(&head, branch);
506 ref = find_ref_by_name(refs, head.buf);
507 strbuf_release(&head);
508
509 return ref;
510 }
511
512 static struct ref *wanted_peer_refs(const struct ref *refs,
513 struct refspec *refspec)
514 {
515 struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
516 struct ref *local_refs = head;
517 struct ref **tail = head ? &head->next : &local_refs;
518
519 if (option_single_branch) {
520 struct ref *remote_head = NULL;
521
522 if (!option_branch)
523 remote_head = guess_remote_head(head, refs, 0);
524 else {
525 local_refs = NULL;
526 tail = &local_refs;
527 remote_head = copy_ref(find_remote_branch(refs, option_branch));
528 }
529
530 if (!remote_head && option_branch)
531 warning(_("Could not find remote branch %s to clone."),
532 option_branch);
533 else {
534 get_fetch_map(remote_head, refspec, &tail, 0);
535
536 /* if --branch=tag, pull the requested tag explicitly */
537 get_fetch_map(remote_head, tag_refspec, &tail, 0);
538 }
539 } else
540 get_fetch_map(refs, refspec, &tail, 0);
541
542 if (!option_mirror && !option_single_branch)
543 get_fetch_map(refs, tag_refspec, &tail, 0);
544
545 return local_refs;
546 }
547
548 static void write_remote_refs(const struct ref *local_refs)
549 {
550 const struct ref *r;
551
552 struct ref_transaction *t;
553 struct strbuf err = STRBUF_INIT;
554
555 t = ref_transaction_begin(&err);
556 if (!t)
557 die("%s", err.buf);
558
559 for (r = local_refs; r; r = r->next) {
560 if (!r->peer_ref)
561 continue;
562 if (ref_transaction_create(t, r->peer_ref->name, r->old_sha1,
563 0, NULL, &err))
564 die("%s", err.buf);
565 }
566
567 if (initial_ref_transaction_commit(t, &err))
568 die("%s", err.buf);
569
570 strbuf_release(&err);
571 ref_transaction_free(t);
572 }
573
574 static void write_followtags(const struct ref *refs, const char *msg)
575 {
576 const struct ref *ref;
577 for (ref = refs; ref; ref = ref->next) {
578 if (!starts_with(ref->name, "refs/tags/"))
579 continue;
580 if (ends_with(ref->name, "^{}"))
581 continue;
582 if (!has_sha1_file(ref->old_sha1))
583 continue;
584 update_ref(msg, ref->name, ref->old_sha1,
585 NULL, 0, UPDATE_REFS_DIE_ON_ERR);
586 }
587 }
588
589 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
590 {
591 struct ref **rm = cb_data;
592 struct ref *ref = *rm;
593
594 /*
595 * Skip anything missing a peer_ref, which we are not
596 * actually going to write a ref for.
597 */
598 while (ref && !ref->peer_ref)
599 ref = ref->next;
600 /* Returning -1 notes "end of list" to the caller. */
601 if (!ref)
602 return -1;
603
604 hashcpy(sha1, ref->old_sha1);
605 *rm = ref->next;
606 return 0;
607 }
608
609 static void update_remote_refs(const struct ref *refs,
610 const struct ref *mapped_refs,
611 const struct ref *remote_head_points_at,
612 const char *branch_top,
613 const char *msg,
614 struct transport *transport,
615 int check_connectivity)
616 {
617 const struct ref *rm = mapped_refs;
618
619 if (check_connectivity) {
620 if (transport->progress)
621 fprintf(stderr, _("Checking connectivity... "));
622 if (check_everything_connected_with_transport(iterate_ref_map,
623 0, &rm, transport))
624 die(_("remote did not send all necessary objects"));
625 if (transport->progress)
626 fprintf(stderr, _("done.\n"));
627 }
628
629 if (refs) {
630 write_remote_refs(mapped_refs);
631 if (option_single_branch)
632 write_followtags(refs, msg);
633 }
634
635 if (remote_head_points_at && !option_bare) {
636 struct strbuf head_ref = STRBUF_INIT;
637 strbuf_addstr(&head_ref, branch_top);
638 strbuf_addstr(&head_ref, "HEAD");
639 create_symref(head_ref.buf,
640 remote_head_points_at->peer_ref->name,
641 msg);
642 }
643 }
644
645 static void update_head(const struct ref *our, const struct ref *remote,
646 const char *msg)
647 {
648 const char *head;
649 if (our && skip_prefix(our->name, "refs/heads/", &head)) {
650 /* Local default branch link */
651 create_symref("HEAD", our->name, NULL);
652 if (!option_bare) {
653 update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
654 UPDATE_REFS_DIE_ON_ERR);
655 install_branch_config(0, head, option_origin, our->name);
656 }
657 } else if (our) {
658 struct commit *c = lookup_commit_reference(our->old_sha1);
659 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
660 update_ref(msg, "HEAD", c->object.sha1,
661 NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
662 } else if (remote) {
663 /*
664 * We know remote HEAD points to a non-branch, or
665 * HEAD points to a branch but we don't know which one.
666 * Detach HEAD in all these cases.
667 */
668 update_ref(msg, "HEAD", remote->old_sha1,
669 NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
670 }
671 }
672
673 static int checkout(void)
674 {
675 unsigned char sha1[20];
676 char *head;
677 struct lock_file *lock_file;
678 struct unpack_trees_options opts;
679 struct tree *tree;
680 struct tree_desc t;
681 int err = 0;
682
683 if (option_no_checkout)
684 return 0;
685
686 head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
687 if (!head) {
688 warning(_("remote HEAD refers to nonexistent ref, "
689 "unable to checkout.\n"));
690 return 0;
691 }
692 if (!strcmp(head, "HEAD")) {
693 if (advice_detached_head)
694 detach_advice(sha1_to_hex(sha1));
695 } else {
696 if (!starts_with(head, "refs/heads/"))
697 die(_("HEAD not found below refs/heads!"));
698 }
699 free(head);
700
701 /* We need to be in the new work tree for the checkout */
702 setup_work_tree();
703
704 lock_file = xcalloc(1, sizeof(struct lock_file));
705 hold_locked_index(lock_file, 1);
706
707 memset(&opts, 0, sizeof opts);
708 opts.update = 1;
709 opts.merge = 1;
710 opts.fn = oneway_merge;
711 opts.verbose_update = (option_verbosity >= 0);
712 opts.src_index = &the_index;
713 opts.dst_index = &the_index;
714
715 tree = parse_tree_indirect(sha1);
716 parse_tree(tree);
717 init_tree_desc(&t, tree->buffer, tree->size);
718 if (unpack_trees(1, &t, &opts) < 0)
719 die(_("unable to checkout working tree"));
720
721 if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
722 die(_("unable to write new index file"));
723
724 err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
725 sha1_to_hex(sha1), "1", NULL);
726
727 if (!err && option_recursive)
728 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
729
730 return err;
731 }
732
733 static int write_one_config(const char *key, const char *value, void *data)
734 {
735 return git_config_set_multivar(key, value ? value : "true", "^$", 0);
736 }
737
738 static void write_config(struct string_list *config)
739 {
740 int i;
741
742 for (i = 0; i < config->nr; i++) {
743 if (git_config_parse_parameter(config->items[i].string,
744 write_one_config, NULL) < 0)
745 die("unable to write parameters to config file");
746 }
747 }
748
749 static void write_refspec_config(const char *src_ref_prefix,
750 const struct ref *our_head_points_at,
751 const struct ref *remote_head_points_at,
752 struct strbuf *branch_top)
753 {
754 struct strbuf key = STRBUF_INIT;
755 struct strbuf value = STRBUF_INIT;
756
757 if (option_mirror || !option_bare) {
758 if (option_single_branch && !option_mirror) {
759 if (option_branch) {
760 if (starts_with(our_head_points_at->name, "refs/tags/"))
761 strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
762 our_head_points_at->name);
763 else
764 strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
765 branch_top->buf, option_branch);
766 } else if (remote_head_points_at) {
767 const char *head = remote_head_points_at->name;
768 if (!skip_prefix(head, "refs/heads/", &head))
769 die("BUG: remote HEAD points at non-head?");
770
771 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
772 branch_top->buf, head);
773 }
774 /*
775 * otherwise, the next "git fetch" will
776 * simply fetch from HEAD without updating
777 * any remote-tracking branch, which is what
778 * we want.
779 */
780 } else {
781 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
782 }
783 /* Configure the remote */
784 if (value.len) {
785 strbuf_addf(&key, "remote.%s.fetch", option_origin);
786 git_config_set_multivar(key.buf, value.buf, "^$", 0);
787 strbuf_reset(&key);
788
789 if (option_mirror) {
790 strbuf_addf(&key, "remote.%s.mirror", option_origin);
791 git_config_set(key.buf, "true");
792 strbuf_reset(&key);
793 }
794 }
795 }
796
797 strbuf_release(&key);
798 strbuf_release(&value);
799 }
800
801 static void dissociate_from_references(void)
802 {
803 static const char* argv[] = { "repack", "-a", "-d", NULL };
804
805 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
806 die(_("cannot repack to clean up"));
807 if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
808 die_errno(_("cannot unlink temporary alternates file"));
809 }
810
811 int cmd_clone(int argc, const char **argv, const char *prefix)
812 {
813 int is_bundle = 0, is_local;
814 struct stat buf;
815 const char *repo_name, *repo, *work_tree, *git_dir;
816 char *path, *dir;
817 int dest_exists;
818 const struct ref *refs, *remote_head;
819 const struct ref *remote_head_points_at;
820 const struct ref *our_head_points_at;
821 struct ref *mapped_refs;
822 const struct ref *ref;
823 struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
824 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
825 struct transport *transport = NULL;
826 const char *src_ref_prefix = "refs/heads/";
827 struct remote *remote;
828 int err = 0, complete_refs_before_fetch = 1;
829
830 struct refspec *refspec;
831 const char *fetch_pattern;
832
833 packet_trace_identity("clone");
834 argc = parse_options(argc, argv, prefix, builtin_clone_options,
835 builtin_clone_usage, 0);
836
837 if (argc > 2)
838 usage_msg_opt(_("Too many arguments."),
839 builtin_clone_usage, builtin_clone_options);
840
841 if (argc == 0)
842 usage_msg_opt(_("You must specify a repository to clone."),
843 builtin_clone_usage, builtin_clone_options);
844
845 if (option_single_branch == -1)
846 option_single_branch = option_depth ? 1 : 0;
847
848 if (option_mirror)
849 option_bare = 1;
850
851 if (option_bare) {
852 if (option_origin)
853 die(_("--bare and --origin %s options are incompatible."),
854 option_origin);
855 if (real_git_dir)
856 die(_("--bare and --separate-git-dir are incompatible."));
857 option_no_checkout = 1;
858 }
859
860 if (!option_origin)
861 option_origin = "origin";
862
863 repo_name = argv[0];
864
865 path = get_repo_path(repo_name, &is_bundle);
866 if (path)
867 repo = xstrdup(absolute_path(repo_name));
868 else if (!strchr(repo_name, ':'))
869 die(_("repository '%s' does not exist"), repo_name);
870 else
871 repo = repo_name;
872
873 /* no need to be strict, transport_set_option() will validate it again */
874 if (option_depth && atoi(option_depth) < 1)
875 die(_("depth %s is not a positive number"), option_depth);
876
877 if (argc == 2)
878 dir = xstrdup(argv[1]);
879 else
880 dir = guess_dir_name(repo_name, is_bundle, option_bare);
881 strip_trailing_slashes(dir);
882
883 dest_exists = !stat(dir, &buf);
884 if (dest_exists && !is_empty_dir(dir))
885 die(_("destination path '%s' already exists and is not "
886 "an empty directory."), dir);
887
888 strbuf_addf(&reflog_msg, "clone: from %s", repo);
889
890 if (option_bare)
891 work_tree = NULL;
892 else {
893 work_tree = getenv("GIT_WORK_TREE");
894 if (work_tree && !stat(work_tree, &buf))
895 die(_("working tree '%s' already exists."), work_tree);
896 }
897
898 if (option_bare || work_tree)
899 git_dir = xstrdup(dir);
900 else {
901 work_tree = dir;
902 git_dir = mkpathdup("%s/.git", dir);
903 }
904
905 atexit(remove_junk);
906 sigchain_push_common(remove_junk_on_signal);
907
908 if (!option_bare) {
909 if (safe_create_leading_directories_const(work_tree) < 0)
910 die_errno(_("could not create leading directories of '%s'"),
911 work_tree);
912 if (!dest_exists && mkdir(work_tree, 0777))
913 die_errno(_("could not create work tree dir '%s'"),
914 work_tree);
915 junk_work_tree = work_tree;
916 set_git_work_tree(work_tree);
917 }
918
919 junk_git_dir = git_dir;
920 if (safe_create_leading_directories_const(git_dir) < 0)
921 die(_("could not create leading directories of '%s'"), git_dir);
922
923 set_git_dir_init(git_dir, real_git_dir, 0);
924 if (real_git_dir) {
925 git_dir = real_git_dir;
926 junk_git_dir = real_git_dir;
927 }
928
929 if (0 <= option_verbosity) {
930 if (option_bare)
931 fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
932 else
933 fprintf(stderr, _("Cloning into '%s'...\n"), dir);
934 }
935 init_db(option_template, INIT_DB_QUIET);
936 write_config(&option_config);
937
938 git_config(git_default_config, NULL);
939
940 if (option_bare) {
941 if (option_mirror)
942 src_ref_prefix = "refs/";
943 strbuf_addstr(&branch_top, src_ref_prefix);
944
945 git_config_set("core.bare", "true");
946 } else {
947 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
948 }
949
950 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
951 strbuf_addf(&key, "remote.%s.url", option_origin);
952 git_config_set(key.buf, repo);
953 strbuf_reset(&key);
954
955 if (option_reference.nr)
956 setup_reference();
957 else if (option_dissociate) {
958 warning(_("--dissociate given, but there is no --reference"));
959 option_dissociate = 0;
960 }
961
962 fetch_pattern = value.buf;
963 refspec = parse_fetch_refspec(1, &fetch_pattern);
964
965 strbuf_reset(&value);
966
967 remote = remote_get(option_origin);
968 transport = transport_get(remote, remote->url[0]);
969 transport_set_verbosity(transport, option_verbosity, option_progress);
970
971 path = get_repo_path(remote->url[0], &is_bundle);
972 is_local = option_local != 0 && path && !is_bundle;
973 if (is_local) {
974 if (option_depth)
975 warning(_("--depth is ignored in local clones; use file:// instead."));
976 if (!access(mkpath("%s/shallow", path), F_OK)) {
977 if (option_local > 0)
978 warning(_("source repository is shallow, ignoring --local"));
979 is_local = 0;
980 }
981 }
982 if (option_local > 0 && !is_local)
983 warning(_("--local is ignored"));
984 transport->cloning = 1;
985
986 if (!transport->get_refs_list || (!is_local && !transport->fetch))
987 die(_("Don't know how to clone %s"), transport->url);
988
989 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
990
991 if (option_depth)
992 transport_set_option(transport, TRANS_OPT_DEPTH,
993 option_depth);
994 if (option_single_branch)
995 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
996
997 if (option_upload_pack)
998 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
999 option_upload_pack);
1000
1001 if (transport->smart_options && !option_depth)
1002 transport->smart_options->check_self_contained_and_connected = 1;
1003
1004 refs = transport_get_remote_refs(transport);
1005
1006 if (refs) {
1007 mapped_refs = wanted_peer_refs(refs, refspec);
1008 /*
1009 * transport_get_remote_refs() may return refs with null sha-1
1010 * in mapped_refs (see struct transport->get_refs_list
1011 * comment). In that case we need fetch it early because
1012 * remote_head code below relies on it.
1013 *
1014 * for normal clones, transport_get_remote_refs() should
1015 * return reliable ref set, we can delay cloning until after
1016 * remote HEAD check.
1017 */
1018 for (ref = refs; ref; ref = ref->next)
1019 if (is_null_sha1(ref->old_sha1)) {
1020 complete_refs_before_fetch = 0;
1021 break;
1022 }
1023
1024 if (!is_local && !complete_refs_before_fetch)
1025 transport_fetch_refs(transport, mapped_refs);
1026
1027 remote_head = find_ref_by_name(refs, "HEAD");
1028 remote_head_points_at =
1029 guess_remote_head(remote_head, mapped_refs, 0);
1030
1031 if (option_branch) {
1032 our_head_points_at =
1033 find_remote_branch(mapped_refs, option_branch);
1034
1035 if (!our_head_points_at)
1036 die(_("Remote branch %s not found in upstream %s"),
1037 option_branch, option_origin);
1038 }
1039 else
1040 our_head_points_at = remote_head_points_at;
1041 }
1042 else {
1043 if (option_branch)
1044 die(_("Remote branch %s not found in upstream %s"),
1045 option_branch, option_origin);
1046
1047 warning(_("You appear to have cloned an empty repository."));
1048 mapped_refs = NULL;
1049 our_head_points_at = NULL;
1050 remote_head_points_at = NULL;
1051 remote_head = NULL;
1052 option_no_checkout = 1;
1053 if (!option_bare)
1054 install_branch_config(0, "master", option_origin,
1055 "refs/heads/master");
1056 }
1057
1058 write_refspec_config(src_ref_prefix, our_head_points_at,
1059 remote_head_points_at, &branch_top);
1060
1061 if (is_local)
1062 clone_local(path, git_dir);
1063 else if (refs && complete_refs_before_fetch)
1064 transport_fetch_refs(transport, mapped_refs);
1065
1066 update_remote_refs(refs, mapped_refs, remote_head_points_at,
1067 branch_top.buf, reflog_msg.buf, transport, !is_local);
1068
1069 update_head(our_head_points_at, remote_head, reflog_msg.buf);
1070
1071 transport_unlock_pack(transport);
1072 transport_disconnect(transport);
1073
1074 if (option_dissociate) {
1075 close_all_packs();
1076 dissociate_from_references();
1077 }
1078
1079 junk_mode = JUNK_LEAVE_REPO;
1080 err = checkout();
1081
1082 strbuf_release(&reflog_msg);
1083 strbuf_release(&branch_top);
1084 strbuf_release(&key);
1085 strbuf_release(&value);
1086 junk_mode = JUNK_LEAVE_ALL;
1087
1088 free(refspec);
1089 return err;
1090 }