6aa286fd7be6cc7e6de8194c4c37c84a474be6a2
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 */
36static const char * const builtin_clone_usage[] = {
37 N_("git clone [<options>] [--] <repo> [<dir>]"),
38 NULL
39};
40
41static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
42static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
43static char *option_template, *option_depth;
44static char *option_origin = NULL;
45static char *option_branch = NULL;
46static const char *real_git_dir;
47static char *option_upload_pack = "git-upload-pack";
48static int option_verbosity;
49static int option_progress = -1;
50static struct string_list option_config;
51static struct string_list option_reference;
52static int option_dissociate;
53
54static 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
98static const char *argv_submodule[] = {
99 "submodule", "update", "--init", "--recursive", NULL
100};
101
102static 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
147static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
148{
149 const char *end = repo + strlen(repo), *start, *ptr;
150 size_t len;
151 char *dir;
152
153 /*
154 * Skip scheme.
155 */
156 start = strstr(repo, "://");
157 if (start == NULL)
158 start = repo;
159 else
160 start += 3;
161
162 /*
163 * Skip authentication data. The stripping does happen
164 * greedily, such that we strip up to the last '@' inside
165 * the host part.
166 */
167 for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
168 if (*ptr == '@')
169 start = ptr + 1;
170 }
171
172 /*
173 * Strip trailing spaces, slashes and /.git
174 */
175 while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
176 end--;
177 if (end - start > 5 && is_dir_sep(end[-5]) &&
178 !strncmp(end - 4, ".git", 4)) {
179 end -= 5;
180 while (start < end && is_dir_sep(end[-1]))
181 end--;
182 }
183
184 /*
185 * Find last component. To remain backwards compatible we
186 * also regard colons as path separators, such that
187 * cloning a repository 'foo:bar.git' would result in a
188 * directory 'bar' being guessed.
189 */
190 ptr = end;
191 while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
192 ptr--;
193 start = ptr;
194
195 /*
196 * Strip .{bundle,git}.
197 */
198 len = end - start;
199 strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
200
201 if (is_bare)
202 dir = xstrfmt("%.*s.git", (int)len, start);
203 else
204 dir = xstrndup(start, len);
205 /*
206 * Replace sequences of 'control' characters and whitespace
207 * with one ascii space, remove leading and trailing spaces.
208 */
209 if (*dir) {
210 char *out = dir;
211 int prev_space = 1 /* strip leading whitespace */;
212 for (end = dir; *end; ++end) {
213 char ch = *end;
214 if ((unsigned char)ch < '\x20')
215 ch = '\x20';
216 if (isspace(ch)) {
217 if (prev_space)
218 continue;
219 prev_space = 1;
220 } else
221 prev_space = 0;
222 *out++ = ch;
223 }
224 *out = '\0';
225 if (out > dir && prev_space)
226 out[-1] = '\0';
227 }
228 return dir;
229}
230
231static void strip_trailing_slashes(char *dir)
232{
233 char *end = dir + strlen(dir);
234
235 while (dir < end - 1 && is_dir_sep(end[-1]))
236 end--;
237 *end = '\0';
238}
239
240static int add_one_reference(struct string_list_item *item, void *cb_data)
241{
242 char *ref_git;
243 const char *repo;
244 struct strbuf alternate = STRBUF_INIT;
245
246 /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
247 ref_git = xstrdup(real_path(item->string));
248
249 repo = read_gitfile(ref_git);
250 if (!repo)
251 repo = read_gitfile(mkpath("%s/.git", ref_git));
252 if (repo) {
253 free(ref_git);
254 ref_git = xstrdup(repo);
255 }
256
257 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
258 char *ref_git_git = mkpathdup("%s/.git", ref_git);
259 free(ref_git);
260 ref_git = ref_git_git;
261 } else if (!is_directory(mkpath("%s/objects", ref_git)))
262 die(_("reference repository '%s' is not a local repository."),
263 item->string);
264
265 if (!access(mkpath("%s/shallow", ref_git), F_OK))
266 die(_("reference repository '%s' is shallow"), item->string);
267
268 if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
269 die(_("reference repository '%s' is grafted"), item->string);
270
271 strbuf_addf(&alternate, "%s/objects", ref_git);
272 add_to_alternates_file(alternate.buf);
273 strbuf_release(&alternate);
274 free(ref_git);
275 return 0;
276}
277
278static void setup_reference(void)
279{
280 for_each_string_list(&option_reference, add_one_reference, NULL);
281}
282
283static void copy_alternates(struct strbuf *src, struct strbuf *dst,
284 const char *src_repo)
285{
286 /*
287 * Read from the source objects/info/alternates file
288 * and copy the entries to corresponding file in the
289 * destination repository with add_to_alternates_file().
290 * Both src and dst have "$path/objects/info/alternates".
291 *
292 * Instead of copying bit-for-bit from the original,
293 * we need to append to existing one so that the already
294 * created entry via "clone -s" is not lost, and also
295 * to turn entries with paths relative to the original
296 * absolute, so that they can be used in the new repository.
297 */
298 FILE *in = fopen(src->buf, "r");
299 struct strbuf line = STRBUF_INIT;
300
301 while (strbuf_getline(&line, in, '\n') != EOF) {
302 char *abs_path, abs_buf[PATH_MAX];
303 if (!line.len || line.buf[0] == '#')
304 continue;
305 if (is_absolute_path(line.buf)) {
306 add_to_alternates_file(line.buf);
307 continue;
308 }
309 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
310 normalize_path_copy(abs_buf, abs_path);
311 add_to_alternates_file(abs_buf);
312 }
313 strbuf_release(&line);
314 fclose(in);
315}
316
317static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
318 const char *src_repo, int src_baselen)
319{
320 struct dirent *de;
321 struct stat buf;
322 int src_len, dest_len;
323 DIR *dir;
324
325 dir = opendir(src->buf);
326 if (!dir)
327 die_errno(_("failed to open '%s'"), src->buf);
328
329 if (mkdir(dest->buf, 0777)) {
330 if (errno != EEXIST)
331 die_errno(_("failed to create directory '%s'"), dest->buf);
332 else if (stat(dest->buf, &buf))
333 die_errno(_("failed to stat '%s'"), dest->buf);
334 else if (!S_ISDIR(buf.st_mode))
335 die(_("%s exists and is not a directory"), dest->buf);
336 }
337
338 strbuf_addch(src, '/');
339 src_len = src->len;
340 strbuf_addch(dest, '/');
341 dest_len = dest->len;
342
343 while ((de = readdir(dir)) != NULL) {
344 strbuf_setlen(src, src_len);
345 strbuf_addstr(src, de->d_name);
346 strbuf_setlen(dest, dest_len);
347 strbuf_addstr(dest, de->d_name);
348 if (stat(src->buf, &buf)) {
349 warning (_("failed to stat %s\n"), src->buf);
350 continue;
351 }
352 if (S_ISDIR(buf.st_mode)) {
353 if (de->d_name[0] != '.')
354 copy_or_link_directory(src, dest,
355 src_repo, src_baselen);
356 continue;
357 }
358
359 /* Files that cannot be copied bit-for-bit... */
360 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
361 copy_alternates(src, dest, src_repo);
362 continue;
363 }
364
365 if (unlink(dest->buf) && errno != ENOENT)
366 die_errno(_("failed to unlink '%s'"), dest->buf);
367 if (!option_no_hardlinks) {
368 if (!link(src->buf, dest->buf))
369 continue;
370 if (option_local > 0)
371 die_errno(_("failed to create link '%s'"), dest->buf);
372 option_no_hardlinks = 1;
373 }
374 if (copy_file_with_time(dest->buf, src->buf, 0666))
375 die_errno(_("failed to copy file to '%s'"), dest->buf);
376 }
377 closedir(dir);
378}
379
380static void clone_local(const char *src_repo, const char *dest_repo)
381{
382 if (option_shared) {
383 struct strbuf alt = STRBUF_INIT;
384 strbuf_addf(&alt, "%s/objects", src_repo);
385 add_to_alternates_file(alt.buf);
386 strbuf_release(&alt);
387 } else {
388 struct strbuf src = STRBUF_INIT;
389 struct strbuf dest = STRBUF_INIT;
390 strbuf_addf(&src, "%s/objects", src_repo);
391 strbuf_addf(&dest, "%s/objects", dest_repo);
392 copy_or_link_directory(&src, &dest, src_repo, src.len);
393 strbuf_release(&src);
394 strbuf_release(&dest);
395 }
396
397 if (0 <= option_verbosity)
398 fprintf(stderr, _("done.\n"));
399}
400
401static const char *junk_work_tree;
402static const char *junk_git_dir;
403static enum {
404 JUNK_LEAVE_NONE,
405 JUNK_LEAVE_REPO,
406 JUNK_LEAVE_ALL
407} junk_mode = JUNK_LEAVE_NONE;
408
409static const char junk_leave_repo_msg[] =
410N_("Clone succeeded, but checkout failed.\n"
411 "You can inspect what was checked out with 'git status'\n"
412 "and retry the checkout with 'git checkout -f HEAD'\n");
413
414static void remove_junk(void)
415{
416 struct strbuf sb = STRBUF_INIT;
417
418 switch (junk_mode) {
419 case JUNK_LEAVE_REPO:
420 warning("%s", _(junk_leave_repo_msg));
421 /* fall-through */
422 case JUNK_LEAVE_ALL:
423 return;
424 default:
425 /* proceed to removal */
426 break;
427 }
428
429 if (junk_git_dir) {
430 strbuf_addstr(&sb, junk_git_dir);
431 remove_dir_recursively(&sb, 0);
432 strbuf_reset(&sb);
433 }
434 if (junk_work_tree) {
435 strbuf_addstr(&sb, junk_work_tree);
436 remove_dir_recursively(&sb, 0);
437 strbuf_reset(&sb);
438 }
439}
440
441static void remove_junk_on_signal(int signo)
442{
443 remove_junk();
444 sigchain_pop(signo);
445 raise(signo);
446}
447
448static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
449{
450 struct ref *ref;
451 struct strbuf head = STRBUF_INIT;
452 strbuf_addstr(&head, "refs/heads/");
453 strbuf_addstr(&head, branch);
454 ref = find_ref_by_name(refs, head.buf);
455 strbuf_release(&head);
456
457 if (ref)
458 return ref;
459
460 strbuf_addstr(&head, "refs/tags/");
461 strbuf_addstr(&head, branch);
462 ref = find_ref_by_name(refs, head.buf);
463 strbuf_release(&head);
464
465 return ref;
466}
467
468static struct ref *wanted_peer_refs(const struct ref *refs,
469 struct refspec *refspec)
470{
471 struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
472 struct ref *local_refs = head;
473 struct ref **tail = head ? &head->next : &local_refs;
474
475 if (option_single_branch) {
476 struct ref *remote_head = NULL;
477
478 if (!option_branch)
479 remote_head = guess_remote_head(head, refs, 0);
480 else {
481 local_refs = NULL;
482 tail = &local_refs;
483 remote_head = copy_ref(find_remote_branch(refs, option_branch));
484 }
485
486 if (!remote_head && option_branch)
487 warning(_("Could not find remote branch %s to clone."),
488 option_branch);
489 else {
490 get_fetch_map(remote_head, refspec, &tail, 0);
491
492 /* if --branch=tag, pull the requested tag explicitly */
493 get_fetch_map(remote_head, tag_refspec, &tail, 0);
494 }
495 } else
496 get_fetch_map(refs, refspec, &tail, 0);
497
498 if (!option_mirror && !option_single_branch)
499 get_fetch_map(refs, tag_refspec, &tail, 0);
500
501 return local_refs;
502}
503
504static void write_remote_refs(const struct ref *local_refs)
505{
506 const struct ref *r;
507
508 lock_packed_refs(LOCK_DIE_ON_ERROR);
509
510 for (r = local_refs; r; r = r->next) {
511 if (!r->peer_ref)
512 continue;
513 add_packed_ref(r->peer_ref->name, r->old_sha1);
514 }
515
516 if (commit_packed_refs())
517 die_errno("unable to overwrite old ref-pack file");
518}
519
520static void write_followtags(const struct ref *refs, const char *msg)
521{
522 const struct ref *ref;
523 for (ref = refs; ref; ref = ref->next) {
524 if (!starts_with(ref->name, "refs/tags/"))
525 continue;
526 if (ends_with(ref->name, "^{}"))
527 continue;
528 if (!has_sha1_file(ref->old_sha1))
529 continue;
530 update_ref(msg, ref->name, ref->old_sha1,
531 NULL, 0, UPDATE_REFS_DIE_ON_ERR);
532 }
533}
534
535static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
536{
537 struct ref **rm = cb_data;
538 struct ref *ref = *rm;
539
540 /*
541 * Skip anything missing a peer_ref, which we are not
542 * actually going to write a ref for.
543 */
544 while (ref && !ref->peer_ref)
545 ref = ref->next;
546 /* Returning -1 notes "end of list" to the caller. */
547 if (!ref)
548 return -1;
549
550 hashcpy(sha1, ref->old_sha1);
551 *rm = ref->next;
552 return 0;
553}
554
555static void update_remote_refs(const struct ref *refs,
556 const struct ref *mapped_refs,
557 const struct ref *remote_head_points_at,
558 const char *branch_top,
559 const char *msg,
560 struct transport *transport,
561 int check_connectivity)
562{
563 const struct ref *rm = mapped_refs;
564
565 if (check_connectivity) {
566 if (transport->progress)
567 fprintf(stderr, _("Checking connectivity... "));
568 if (check_everything_connected_with_transport(iterate_ref_map,
569 0, &rm, transport))
570 die(_("remote did not send all necessary objects"));
571 if (transport->progress)
572 fprintf(stderr, _("done.\n"));
573 }
574
575 if (refs) {
576 write_remote_refs(mapped_refs);
577 if (option_single_branch)
578 write_followtags(refs, msg);
579 }
580
581 if (remote_head_points_at && !option_bare) {
582 struct strbuf head_ref = STRBUF_INIT;
583 strbuf_addstr(&head_ref, branch_top);
584 strbuf_addstr(&head_ref, "HEAD");
585 create_symref(head_ref.buf,
586 remote_head_points_at->peer_ref->name,
587 msg);
588 }
589}
590
591static void update_head(const struct ref *our, const struct ref *remote,
592 const char *msg)
593{
594 const char *head;
595 if (our && skip_prefix(our->name, "refs/heads/", &head)) {
596 /* Local default branch link */
597 create_symref("HEAD", our->name, NULL);
598 if (!option_bare) {
599 update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
600 UPDATE_REFS_DIE_ON_ERR);
601 install_branch_config(0, head, option_origin, our->name);
602 }
603 } else if (our) {
604 struct commit *c = lookup_commit_reference(our->old_sha1);
605 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
606 update_ref(msg, "HEAD", c->object.sha1,
607 NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
608 } else if (remote) {
609 /*
610 * We know remote HEAD points to a non-branch, or
611 * HEAD points to a branch but we don't know which one.
612 * Detach HEAD in all these cases.
613 */
614 update_ref(msg, "HEAD", remote->old_sha1,
615 NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
616 }
617}
618
619static int checkout(void)
620{
621 unsigned char sha1[20];
622 char *head;
623 struct lock_file *lock_file;
624 struct unpack_trees_options opts;
625 struct tree *tree;
626 struct tree_desc t;
627 int err = 0;
628
629 if (option_no_checkout)
630 return 0;
631
632 head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
633 if (!head) {
634 warning(_("remote HEAD refers to nonexistent ref, "
635 "unable to checkout.\n"));
636 return 0;
637 }
638 if (!strcmp(head, "HEAD")) {
639 if (advice_detached_head)
640 detach_advice(sha1_to_hex(sha1));
641 } else {
642 if (!starts_with(head, "refs/heads/"))
643 die(_("HEAD not found below refs/heads!"));
644 }
645 free(head);
646
647 /* We need to be in the new work tree for the checkout */
648 setup_work_tree();
649
650 lock_file = xcalloc(1, sizeof(struct lock_file));
651 hold_locked_index(lock_file, 1);
652
653 memset(&opts, 0, sizeof opts);
654 opts.update = 1;
655 opts.merge = 1;
656 opts.fn = oneway_merge;
657 opts.verbose_update = (option_verbosity >= 0);
658 opts.src_index = &the_index;
659 opts.dst_index = &the_index;
660
661 tree = parse_tree_indirect(sha1);
662 parse_tree(tree);
663 init_tree_desc(&t, tree->buffer, tree->size);
664 if (unpack_trees(1, &t, &opts) < 0)
665 die(_("unable to checkout working tree"));
666
667 if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
668 die(_("unable to write new index file"));
669
670 err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
671 sha1_to_hex(sha1), "1", NULL);
672
673 if (!err && option_recursive)
674 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
675
676 return err;
677}
678
679static int write_one_config(const char *key, const char *value, void *data)
680{
681 return git_config_set_multivar(key, value ? value : "true", "^$", 0);
682}
683
684static void write_config(struct string_list *config)
685{
686 int i;
687
688 for (i = 0; i < config->nr; i++) {
689 if (git_config_parse_parameter(config->items[i].string,
690 write_one_config, NULL) < 0)
691 die("unable to write parameters to config file");
692 }
693}
694
695static void write_refspec_config(const char *src_ref_prefix,
696 const struct ref *our_head_points_at,
697 const struct ref *remote_head_points_at,
698 struct strbuf *branch_top)
699{
700 struct strbuf key = STRBUF_INIT;
701 struct strbuf value = STRBUF_INIT;
702
703 if (option_mirror || !option_bare) {
704 if (option_single_branch && !option_mirror) {
705 if (option_branch) {
706 if (starts_with(our_head_points_at->name, "refs/tags/"))
707 strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
708 our_head_points_at->name);
709 else
710 strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
711 branch_top->buf, option_branch);
712 } else if (remote_head_points_at) {
713 const char *head = remote_head_points_at->name;
714 if (!skip_prefix(head, "refs/heads/", &head))
715 die("BUG: remote HEAD points at non-head?");
716
717 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
718 branch_top->buf, head);
719 }
720 /*
721 * otherwise, the next "git fetch" will
722 * simply fetch from HEAD without updating
723 * any remote-tracking branch, which is what
724 * we want.
725 */
726 } else {
727 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
728 }
729 /* Configure the remote */
730 if (value.len) {
731 strbuf_addf(&key, "remote.%s.fetch", option_origin);
732 git_config_set_multivar(key.buf, value.buf, "^$", 0);
733 strbuf_reset(&key);
734
735 if (option_mirror) {
736 strbuf_addf(&key, "remote.%s.mirror", option_origin);
737 git_config_set(key.buf, "true");
738 strbuf_reset(&key);
739 }
740 }
741 }
742
743 strbuf_release(&key);
744 strbuf_release(&value);
745}
746
747static void dissociate_from_references(void)
748{
749 static const char* argv[] = { "repack", "-a", "-d", NULL };
750
751 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
752 die(_("cannot repack to clean up"));
753 if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
754 die_errno(_("cannot unlink temporary alternates file"));
755}
756
757int cmd_clone(int argc, const char **argv, const char *prefix)
758{
759 int is_bundle = 0, is_local;
760 struct stat buf;
761 const char *repo_name, *repo, *work_tree, *git_dir;
762 char *path, *dir;
763 int dest_exists;
764 const struct ref *refs, *remote_head;
765 const struct ref *remote_head_points_at;
766 const struct ref *our_head_points_at;
767 struct ref *mapped_refs;
768 const struct ref *ref;
769 struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
770 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
771 struct transport *transport = NULL;
772 const char *src_ref_prefix = "refs/heads/";
773 struct remote *remote;
774 int err = 0, complete_refs_before_fetch = 1;
775
776 struct refspec *refspec;
777 const char *fetch_pattern;
778
779 packet_trace_identity("clone");
780 argc = parse_options(argc, argv, prefix, builtin_clone_options,
781 builtin_clone_usage, 0);
782
783 if (argc > 2)
784 usage_msg_opt(_("Too many arguments."),
785 builtin_clone_usage, builtin_clone_options);
786
787 if (argc == 0)
788 usage_msg_opt(_("You must specify a repository to clone."),
789 builtin_clone_usage, builtin_clone_options);
790
791 if (option_single_branch == -1)
792 option_single_branch = option_depth ? 1 : 0;
793
794 if (option_mirror)
795 option_bare = 1;
796
797 if (option_bare) {
798 if (option_origin)
799 die(_("--bare and --origin %s options are incompatible."),
800 option_origin);
801 if (real_git_dir)
802 die(_("--bare and --separate-git-dir are incompatible."));
803 option_no_checkout = 1;
804 }
805
806 if (!option_origin)
807 option_origin = "origin";
808
809 repo_name = argv[0];
810
811 path = get_repo_path(repo_name, &is_bundle);
812 if (path)
813 repo = xstrdup(absolute_path(repo_name));
814 else if (!strchr(repo_name, ':'))
815 die(_("repository '%s' does not exist"), repo_name);
816 else
817 repo = repo_name;
818
819 /* no need to be strict, transport_set_option() will validate it again */
820 if (option_depth && atoi(option_depth) < 1)
821 die(_("depth %s is not a positive number"), option_depth);
822
823 if (argc == 2)
824 dir = xstrdup(argv[1]);
825 else
826 dir = guess_dir_name(repo_name, is_bundle, option_bare);
827 strip_trailing_slashes(dir);
828
829 dest_exists = !stat(dir, &buf);
830 if (dest_exists && !is_empty_dir(dir))
831 die(_("destination path '%s' already exists and is not "
832 "an empty directory."), dir);
833
834 strbuf_addf(&reflog_msg, "clone: from %s", repo);
835
836 if (option_bare)
837 work_tree = NULL;
838 else {
839 work_tree = getenv("GIT_WORK_TREE");
840 if (work_tree && !stat(work_tree, &buf))
841 die(_("working tree '%s' already exists."), work_tree);
842 }
843
844 if (option_bare || work_tree)
845 git_dir = xstrdup(dir);
846 else {
847 work_tree = dir;
848 git_dir = mkpathdup("%s/.git", dir);
849 }
850
851 atexit(remove_junk);
852 sigchain_push_common(remove_junk_on_signal);
853
854 if (!option_bare) {
855 if (safe_create_leading_directories_const(work_tree) < 0)
856 die_errno(_("could not create leading directories of '%s'"),
857 work_tree);
858 if (!dest_exists && mkdir(work_tree, 0777))
859 die_errno(_("could not create work tree dir '%s'"),
860 work_tree);
861 junk_work_tree = work_tree;
862 set_git_work_tree(work_tree);
863 }
864
865 junk_git_dir = git_dir;
866 if (safe_create_leading_directories_const(git_dir) < 0)
867 die(_("could not create leading directories of '%s'"), git_dir);
868
869 set_git_dir_init(git_dir, real_git_dir, 0);
870 if (real_git_dir) {
871 git_dir = real_git_dir;
872 junk_git_dir = real_git_dir;
873 }
874
875 if (0 <= option_verbosity) {
876 if (option_bare)
877 fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
878 else
879 fprintf(stderr, _("Cloning into '%s'...\n"), dir);
880 }
881 init_db(option_template, INIT_DB_QUIET);
882 write_config(&option_config);
883
884 git_config(git_default_config, NULL);
885
886 if (option_bare) {
887 if (option_mirror)
888 src_ref_prefix = "refs/";
889 strbuf_addstr(&branch_top, src_ref_prefix);
890
891 git_config_set("core.bare", "true");
892 } else {
893 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
894 }
895
896 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
897 strbuf_addf(&key, "remote.%s.url", option_origin);
898 git_config_set(key.buf, repo);
899 strbuf_reset(&key);
900
901 if (option_reference.nr)
902 setup_reference();
903 else if (option_dissociate) {
904 warning(_("--dissociate given, but there is no --reference"));
905 option_dissociate = 0;
906 }
907
908 fetch_pattern = value.buf;
909 refspec = parse_fetch_refspec(1, &fetch_pattern);
910
911 strbuf_reset(&value);
912
913 remote = remote_get(option_origin);
914 transport = transport_get(remote, remote->url[0]);
915 transport_set_verbosity(transport, option_verbosity, option_progress);
916
917 path = get_repo_path(remote->url[0], &is_bundle);
918 is_local = option_local != 0 && path && !is_bundle;
919 if (is_local) {
920 if (option_depth)
921 warning(_("--depth is ignored in local clones; use file:// instead."));
922 if (!access(mkpath("%s/shallow", path), F_OK)) {
923 if (option_local > 0)
924 warning(_("source repository is shallow, ignoring --local"));
925 is_local = 0;
926 }
927 }
928 if (option_local > 0 && !is_local)
929 warning(_("--local is ignored"));
930 transport->cloning = 1;
931
932 if (!transport->get_refs_list || (!is_local && !transport->fetch))
933 die(_("Don't know how to clone %s"), transport->url);
934
935 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
936
937 if (option_depth)
938 transport_set_option(transport, TRANS_OPT_DEPTH,
939 option_depth);
940 if (option_single_branch)
941 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
942
943 if (option_upload_pack)
944 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
945 option_upload_pack);
946
947 if (transport->smart_options && !option_depth)
948 transport->smart_options->check_self_contained_and_connected = 1;
949
950 refs = transport_get_remote_refs(transport);
951
952 if (refs) {
953 mapped_refs = wanted_peer_refs(refs, refspec);
954 /*
955 * transport_get_remote_refs() may return refs with null sha-1
956 * in mapped_refs (see struct transport->get_refs_list
957 * comment). In that case we need fetch it early because
958 * remote_head code below relies on it.
959 *
960 * for normal clones, transport_get_remote_refs() should
961 * return reliable ref set, we can delay cloning until after
962 * remote HEAD check.
963 */
964 for (ref = refs; ref; ref = ref->next)
965 if (is_null_sha1(ref->old_sha1)) {
966 complete_refs_before_fetch = 0;
967 break;
968 }
969
970 if (!is_local && !complete_refs_before_fetch)
971 transport_fetch_refs(transport, mapped_refs);
972
973 remote_head = find_ref_by_name(refs, "HEAD");
974 remote_head_points_at =
975 guess_remote_head(remote_head, mapped_refs, 0);
976
977 if (option_branch) {
978 our_head_points_at =
979 find_remote_branch(mapped_refs, option_branch);
980
981 if (!our_head_points_at)
982 die(_("Remote branch %s not found in upstream %s"),
983 option_branch, option_origin);
984 }
985 else
986 our_head_points_at = remote_head_points_at;
987 }
988 else {
989 if (option_branch)
990 die(_("Remote branch %s not found in upstream %s"),
991 option_branch, option_origin);
992
993 warning(_("You appear to have cloned an empty repository."));
994 mapped_refs = NULL;
995 our_head_points_at = NULL;
996 remote_head_points_at = NULL;
997 remote_head = NULL;
998 option_no_checkout = 1;
999 if (!option_bare)
1000 install_branch_config(0, "master", option_origin,
1001 "refs/heads/master");
1002 }
1003
1004 write_refspec_config(src_ref_prefix, our_head_points_at,
1005 remote_head_points_at, &branch_top);
1006
1007 if (is_local)
1008 clone_local(path, git_dir);
1009 else if (refs && complete_refs_before_fetch)
1010 transport_fetch_refs(transport, mapped_refs);
1011
1012 update_remote_refs(refs, mapped_refs, remote_head_points_at,
1013 branch_top.buf, reflog_msg.buf, transport, !is_local);
1014
1015 update_head(our_head_points_at, remote_head, reflog_msg.buf);
1016
1017 transport_unlock_pack(transport);
1018 transport_disconnect(transport);
1019
1020 if (option_dissociate)
1021 dissociate_from_references();
1022
1023 junk_mode = JUNK_LEAVE_REPO;
1024 err = checkout();
1025
1026 strbuf_release(&reflog_msg);
1027 strbuf_release(&branch_top);
1028 strbuf_release(&key);
1029 strbuf_release(&value);
1030 junk_mode = JUNK_LEAVE_ALL;
1031
1032 free(refspec);
1033 return err;
1034}