Merge branch 'sb/format-patch-base-patch-id-fix'
[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 #define USE_THE_INDEX_COMPATIBILITY_MACROS
12 #include "builtin.h"
13 #include "config.h"
14 #include "lockfile.h"
15 #include "parse-options.h"
16 #include "fetch-pack.h"
17 #include "refs.h"
18 #include "refspec.h"
19 #include "object-store.h"
20 #include "tree.h"
21 #include "tree-walk.h"
22 #include "unpack-trees.h"
23 #include "transport.h"
24 #include "strbuf.h"
25 #include "dir.h"
26 #include "sigchain.h"
27 #include "branch.h"
28 #include "remote.h"
29 #include "run-command.h"
30 #include "connected.h"
31 #include "packfile.h"
32 #include "list-objects-filter-options.h"
33 #include "object-store.h"
34
35 /*
36 * Overall FIXMEs:
37 * - respect DB_ENVIRONMENT for .git/objects.
38 *
39 * Implementation notes:
40 * - dropping use-separate-remote and no-separate-remote compatibility
41 *
42 */
43 static const char * const builtin_clone_usage[] = {
44 N_("git clone [<options>] [--] <repo> [<dir>]"),
45 NULL
46 };
47
48 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
49 static int option_local = -1, option_no_hardlinks, option_shared;
50 static int option_no_tags;
51 static int option_shallow_submodules;
52 static int deepen;
53 static char *option_template, *option_depth, *option_since;
54 static char *option_origin = NULL;
55 static char *option_branch = NULL;
56 static struct string_list option_not = STRING_LIST_INIT_NODUP;
57 static const char *real_git_dir;
58 static char *option_upload_pack = "git-upload-pack";
59 static int option_verbosity;
60 static int option_progress = -1;
61 static enum transport_family family;
62 static struct string_list option_config = STRING_LIST_INIT_NODUP;
63 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
64 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
65 static int option_dissociate;
66 static int max_jobs = -1;
67 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
68 static struct list_objects_filter_options filter_options;
69 static struct string_list server_options = STRING_LIST_INIT_NODUP;
70
71 static int recurse_submodules_cb(const struct option *opt,
72 const char *arg, int unset)
73 {
74 if (unset)
75 string_list_clear((struct string_list *)opt->value, 0);
76 else if (arg)
77 string_list_append((struct string_list *)opt->value, arg);
78 else
79 string_list_append((struct string_list *)opt->value,
80 (const char *)opt->defval);
81
82 return 0;
83 }
84
85 static struct option builtin_clone_options[] = {
86 OPT__VERBOSITY(&option_verbosity),
87 OPT_BOOL(0, "progress", &option_progress,
88 N_("force progress reporting")),
89 OPT_BOOL('n', "no-checkout", &option_no_checkout,
90 N_("don't create a checkout")),
91 OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
92 OPT_HIDDEN_BOOL(0, "naked", &option_bare,
93 N_("create a bare repository")),
94 OPT_BOOL(0, "mirror", &option_mirror,
95 N_("create a mirror repository (implies bare)")),
96 OPT_BOOL('l', "local", &option_local,
97 N_("to clone from a local repository")),
98 OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
99 N_("don't use local hardlinks, always copy")),
100 OPT_BOOL('s', "shared", &option_shared,
101 N_("setup as shared repository")),
102 OPT_ALIAS(0, "recursive", "recurse-submodules"),
103 { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
104 N_("pathspec"), N_("initialize submodules in the clone"),
105 PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
106 OPT_INTEGER('j', "jobs", &max_jobs,
107 N_("number of submodules cloned in parallel")),
108 OPT_STRING(0, "template", &option_template, N_("template-directory"),
109 N_("directory from which templates will be used")),
110 OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
111 N_("reference repository")),
112 OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
113 N_("repo"), N_("reference repository")),
114 OPT_BOOL(0, "dissociate", &option_dissociate,
115 N_("use --reference only while cloning")),
116 OPT_STRING('o', "origin", &option_origin, N_("name"),
117 N_("use <name> instead of 'origin' to track upstream")),
118 OPT_STRING('b', "branch", &option_branch, N_("branch"),
119 N_("checkout <branch> instead of the remote's HEAD")),
120 OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
121 N_("path to git-upload-pack on the remote")),
122 OPT_STRING(0, "depth", &option_depth, N_("depth"),
123 N_("create a shallow clone of that depth")),
124 OPT_STRING(0, "shallow-since", &option_since, N_("time"),
125 N_("create a shallow clone since a specific time")),
126 OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
127 N_("deepen history of shallow clone, excluding rev")),
128 OPT_BOOL(0, "single-branch", &option_single_branch,
129 N_("clone only one branch, HEAD or --branch")),
130 OPT_BOOL(0, "no-tags", &option_no_tags,
131 N_("don't clone any tags, and make later fetches not to follow them")),
132 OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
133 N_("any cloned submodules will be shallow")),
134 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
135 N_("separate git dir from working tree")),
136 OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
137 N_("set config inside the new repository")),
138 OPT_STRING_LIST(0, "server-option", &server_options,
139 N_("server-specific"), N_("option to transmit")),
140 OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
141 TRANSPORT_FAMILY_IPV4),
142 OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
143 TRANSPORT_FAMILY_IPV6),
144 OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
145 OPT_END()
146 };
147
148 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
149 {
150 static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
151 static char *bundle_suffix[] = { ".bundle", "" };
152 size_t baselen = path->len;
153 struct stat st;
154 int i;
155
156 for (i = 0; i < ARRAY_SIZE(suffix); i++) {
157 strbuf_setlen(path, baselen);
158 strbuf_addstr(path, suffix[i]);
159 if (stat(path->buf, &st))
160 continue;
161 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
162 *is_bundle = 0;
163 return path->buf;
164 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
165 /* Is it a "gitfile"? */
166 char signature[8];
167 const char *dst;
168 int len, fd = open(path->buf, O_RDONLY);
169 if (fd < 0)
170 continue;
171 len = read_in_full(fd, signature, 8);
172 close(fd);
173 if (len != 8 || strncmp(signature, "gitdir: ", 8))
174 continue;
175 dst = read_gitfile(path->buf);
176 if (dst) {
177 *is_bundle = 0;
178 return dst;
179 }
180 }
181 }
182
183 for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
184 strbuf_setlen(path, baselen);
185 strbuf_addstr(path, bundle_suffix[i]);
186 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
187 *is_bundle = 1;
188 return path->buf;
189 }
190 }
191
192 return NULL;
193 }
194
195 static char *get_repo_path(const char *repo, int *is_bundle)
196 {
197 struct strbuf path = STRBUF_INIT;
198 const char *raw;
199 char *canon;
200
201 strbuf_addstr(&path, repo);
202 raw = get_repo_path_1(&path, is_bundle);
203 canon = raw ? absolute_pathdup(raw) : NULL;
204 strbuf_release(&path);
205 return canon;
206 }
207
208 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
209 {
210 const char *end = repo + strlen(repo), *start, *ptr;
211 size_t len;
212 char *dir;
213
214 /*
215 * Skip scheme.
216 */
217 start = strstr(repo, "://");
218 if (start == NULL)
219 start = repo;
220 else
221 start += 3;
222
223 /*
224 * Skip authentication data. The stripping does happen
225 * greedily, such that we strip up to the last '@' inside
226 * the host part.
227 */
228 for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
229 if (*ptr == '@')
230 start = ptr + 1;
231 }
232
233 /*
234 * Strip trailing spaces, slashes and /.git
235 */
236 while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
237 end--;
238 if (end - start > 5 && is_dir_sep(end[-5]) &&
239 !strncmp(end - 4, ".git", 4)) {
240 end -= 5;
241 while (start < end && is_dir_sep(end[-1]))
242 end--;
243 }
244
245 /*
246 * Strip trailing port number if we've got only a
247 * hostname (that is, there is no dir separator but a
248 * colon). This check is required such that we do not
249 * strip URI's like '/foo/bar:2222.git', which should
250 * result in a dir '2222' being guessed due to backwards
251 * compatibility.
252 */
253 if (memchr(start, '/', end - start) == NULL
254 && memchr(start, ':', end - start) != NULL) {
255 ptr = end;
256 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
257 ptr--;
258 if (start < ptr && ptr[-1] == ':')
259 end = ptr - 1;
260 }
261
262 /*
263 * Find last component. To remain backwards compatible we
264 * also regard colons as path separators, such that
265 * cloning a repository 'foo:bar.git' would result in a
266 * directory 'bar' being guessed.
267 */
268 ptr = end;
269 while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
270 ptr--;
271 start = ptr;
272
273 /*
274 * Strip .{bundle,git}.
275 */
276 len = end - start;
277 strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
278
279 if (!len || (len == 1 && *start == '/'))
280 die(_("No directory name could be guessed.\n"
281 "Please specify a directory on the command line"));
282
283 if (is_bare)
284 dir = xstrfmt("%.*s.git", (int)len, start);
285 else
286 dir = xstrndup(start, len);
287 /*
288 * Replace sequences of 'control' characters and whitespace
289 * with one ascii space, remove leading and trailing spaces.
290 */
291 if (*dir) {
292 char *out = dir;
293 int prev_space = 1 /* strip leading whitespace */;
294 for (end = dir; *end; ++end) {
295 char ch = *end;
296 if ((unsigned char)ch < '\x20')
297 ch = '\x20';
298 if (isspace(ch)) {
299 if (prev_space)
300 continue;
301 prev_space = 1;
302 } else
303 prev_space = 0;
304 *out++ = ch;
305 }
306 *out = '\0';
307 if (out > dir && prev_space)
308 out[-1] = '\0';
309 }
310 return dir;
311 }
312
313 static void strip_trailing_slashes(char *dir)
314 {
315 char *end = dir + strlen(dir);
316
317 while (dir < end - 1 && is_dir_sep(end[-1]))
318 end--;
319 *end = '\0';
320 }
321
322 static int add_one_reference(struct string_list_item *item, void *cb_data)
323 {
324 struct strbuf err = STRBUF_INIT;
325 int *required = cb_data;
326 char *ref_git = compute_alternate_path(item->string, &err);
327
328 if (!ref_git) {
329 if (*required)
330 die("%s", err.buf);
331 else
332 fprintf(stderr,
333 _("info: Could not add alternate for '%s': %s\n"),
334 item->string, err.buf);
335 } else {
336 struct strbuf sb = STRBUF_INIT;
337 strbuf_addf(&sb, "%s/objects", ref_git);
338 add_to_alternates_file(sb.buf);
339 strbuf_release(&sb);
340 }
341
342 strbuf_release(&err);
343 free(ref_git);
344 return 0;
345 }
346
347 static void setup_reference(void)
348 {
349 int required = 1;
350 for_each_string_list(&option_required_reference,
351 add_one_reference, &required);
352 required = 0;
353 for_each_string_list(&option_optional_reference,
354 add_one_reference, &required);
355 }
356
357 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
358 const char *src_repo)
359 {
360 /*
361 * Read from the source objects/info/alternates file
362 * and copy the entries to corresponding file in the
363 * destination repository with add_to_alternates_file().
364 * Both src and dst have "$path/objects/info/alternates".
365 *
366 * Instead of copying bit-for-bit from the original,
367 * we need to append to existing one so that the already
368 * created entry via "clone -s" is not lost, and also
369 * to turn entries with paths relative to the original
370 * absolute, so that they can be used in the new repository.
371 */
372 FILE *in = xfopen(src->buf, "r");
373 struct strbuf line = STRBUF_INIT;
374
375 while (strbuf_getline(&line, in) != EOF) {
376 char *abs_path;
377 if (!line.len || line.buf[0] == '#')
378 continue;
379 if (is_absolute_path(line.buf)) {
380 add_to_alternates_file(line.buf);
381 continue;
382 }
383 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
384 if (!normalize_path_copy(abs_path, abs_path))
385 add_to_alternates_file(abs_path);
386 else
387 warning("skipping invalid relative alternate: %s/%s",
388 src_repo, line.buf);
389 free(abs_path);
390 }
391 strbuf_release(&line);
392 fclose(in);
393 }
394
395 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
396 const char *src_repo, int src_baselen)
397 {
398 struct dirent *de;
399 struct stat buf;
400 int src_len, dest_len;
401 DIR *dir;
402
403 dir = opendir(src->buf);
404 if (!dir)
405 die_errno(_("failed to open '%s'"), src->buf);
406
407 if (mkdir(dest->buf, 0777)) {
408 if (errno != EEXIST)
409 die_errno(_("failed to create directory '%s'"), dest->buf);
410 else if (stat(dest->buf, &buf))
411 die_errno(_("failed to stat '%s'"), dest->buf);
412 else if (!S_ISDIR(buf.st_mode))
413 die(_("%s exists and is not a directory"), dest->buf);
414 }
415
416 strbuf_addch(src, '/');
417 src_len = src->len;
418 strbuf_addch(dest, '/');
419 dest_len = dest->len;
420
421 while ((de = readdir(dir)) != NULL) {
422 strbuf_setlen(src, src_len);
423 strbuf_addstr(src, de->d_name);
424 strbuf_setlen(dest, dest_len);
425 strbuf_addstr(dest, de->d_name);
426 if (stat(src->buf, &buf)) {
427 warning (_("failed to stat %s\n"), src->buf);
428 continue;
429 }
430 if (S_ISDIR(buf.st_mode)) {
431 if (de->d_name[0] != '.')
432 copy_or_link_directory(src, dest,
433 src_repo, src_baselen);
434 continue;
435 }
436
437 /* Files that cannot be copied bit-for-bit... */
438 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
439 copy_alternates(src, dest, src_repo);
440 continue;
441 }
442
443 if (unlink(dest->buf) && errno != ENOENT)
444 die_errno(_("failed to unlink '%s'"), dest->buf);
445 if (!option_no_hardlinks) {
446 if (!link(src->buf, dest->buf))
447 continue;
448 if (option_local > 0)
449 die_errno(_("failed to create link '%s'"), dest->buf);
450 option_no_hardlinks = 1;
451 }
452 if (copy_file_with_time(dest->buf, src->buf, 0666))
453 die_errno(_("failed to copy file to '%s'"), dest->buf);
454 }
455 closedir(dir);
456 }
457
458 static void clone_local(const char *src_repo, const char *dest_repo)
459 {
460 if (option_shared) {
461 struct strbuf alt = STRBUF_INIT;
462 get_common_dir(&alt, src_repo);
463 strbuf_addstr(&alt, "/objects");
464 add_to_alternates_file(alt.buf);
465 strbuf_release(&alt);
466 } else {
467 struct strbuf src = STRBUF_INIT;
468 struct strbuf dest = STRBUF_INIT;
469 get_common_dir(&src, src_repo);
470 get_common_dir(&dest, dest_repo);
471 strbuf_addstr(&src, "/objects");
472 strbuf_addstr(&dest, "/objects");
473 copy_or_link_directory(&src, &dest, src_repo, src.len);
474 strbuf_release(&src);
475 strbuf_release(&dest);
476 }
477
478 if (0 <= option_verbosity)
479 fprintf(stderr, _("done.\n"));
480 }
481
482 static const char *junk_work_tree;
483 static int junk_work_tree_flags;
484 static const char *junk_git_dir;
485 static int junk_git_dir_flags;
486 static enum {
487 JUNK_LEAVE_NONE,
488 JUNK_LEAVE_REPO,
489 JUNK_LEAVE_ALL
490 } junk_mode = JUNK_LEAVE_NONE;
491
492 static const char junk_leave_repo_msg[] =
493 N_("Clone succeeded, but checkout failed.\n"
494 "You can inspect what was checked out with 'git status'\n"
495 "and retry the checkout with 'git checkout -f HEAD'\n");
496
497 static void remove_junk(void)
498 {
499 struct strbuf sb = STRBUF_INIT;
500
501 switch (junk_mode) {
502 case JUNK_LEAVE_REPO:
503 warning("%s", _(junk_leave_repo_msg));
504 /* fall-through */
505 case JUNK_LEAVE_ALL:
506 return;
507 default:
508 /* proceed to removal */
509 break;
510 }
511
512 if (junk_git_dir) {
513 strbuf_addstr(&sb, junk_git_dir);
514 remove_dir_recursively(&sb, junk_git_dir_flags);
515 strbuf_reset(&sb);
516 }
517 if (junk_work_tree) {
518 strbuf_addstr(&sb, junk_work_tree);
519 remove_dir_recursively(&sb, junk_work_tree_flags);
520 }
521 strbuf_release(&sb);
522 }
523
524 static void remove_junk_on_signal(int signo)
525 {
526 remove_junk();
527 sigchain_pop(signo);
528 raise(signo);
529 }
530
531 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
532 {
533 struct ref *ref;
534 struct strbuf head = STRBUF_INIT;
535 strbuf_addstr(&head, "refs/heads/");
536 strbuf_addstr(&head, branch);
537 ref = find_ref_by_name(refs, head.buf);
538 strbuf_release(&head);
539
540 if (ref)
541 return ref;
542
543 strbuf_addstr(&head, "refs/tags/");
544 strbuf_addstr(&head, branch);
545 ref = find_ref_by_name(refs, head.buf);
546 strbuf_release(&head);
547
548 return ref;
549 }
550
551 static struct ref *wanted_peer_refs(const struct ref *refs,
552 struct refspec *refspec)
553 {
554 struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
555 struct ref *local_refs = head;
556 struct ref **tail = head ? &head->next : &local_refs;
557
558 if (option_single_branch) {
559 struct ref *remote_head = NULL;
560
561 if (!option_branch)
562 remote_head = guess_remote_head(head, refs, 0);
563 else {
564 local_refs = NULL;
565 tail = &local_refs;
566 remote_head = copy_ref(find_remote_branch(refs, option_branch));
567 }
568
569 if (!remote_head && option_branch)
570 warning(_("Could not find remote branch %s to clone."),
571 option_branch);
572 else {
573 int i;
574 for (i = 0; i < refspec->nr; i++)
575 get_fetch_map(remote_head, &refspec->items[i],
576 &tail, 0);
577
578 /* if --branch=tag, pull the requested tag explicitly */
579 get_fetch_map(remote_head, tag_refspec, &tail, 0);
580 }
581 } else {
582 int i;
583 for (i = 0; i < refspec->nr; i++)
584 get_fetch_map(refs, &refspec->items[i], &tail, 0);
585 }
586
587 if (!option_mirror && !option_single_branch && !option_no_tags)
588 get_fetch_map(refs, tag_refspec, &tail, 0);
589
590 return local_refs;
591 }
592
593 static void write_remote_refs(const struct ref *local_refs)
594 {
595 const struct ref *r;
596
597 struct ref_transaction *t;
598 struct strbuf err = STRBUF_INIT;
599
600 t = ref_transaction_begin(&err);
601 if (!t)
602 die("%s", err.buf);
603
604 for (r = local_refs; r; r = r->next) {
605 if (!r->peer_ref)
606 continue;
607 if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
608 0, NULL, &err))
609 die("%s", err.buf);
610 }
611
612 if (initial_ref_transaction_commit(t, &err))
613 die("%s", err.buf);
614
615 strbuf_release(&err);
616 ref_transaction_free(t);
617 }
618
619 static void write_followtags(const struct ref *refs, const char *msg)
620 {
621 const struct ref *ref;
622 for (ref = refs; ref; ref = ref->next) {
623 if (!starts_with(ref->name, "refs/tags/"))
624 continue;
625 if (ends_with(ref->name, "^{}"))
626 continue;
627 if (!has_object_file(&ref->old_oid))
628 continue;
629 update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
630 UPDATE_REFS_DIE_ON_ERR);
631 }
632 }
633
634 static int iterate_ref_map(void *cb_data, struct object_id *oid)
635 {
636 struct ref **rm = cb_data;
637 struct ref *ref = *rm;
638
639 /*
640 * Skip anything missing a peer_ref, which we are not
641 * actually going to write a ref for.
642 */
643 while (ref && !ref->peer_ref)
644 ref = ref->next;
645 /* Returning -1 notes "end of list" to the caller. */
646 if (!ref)
647 return -1;
648
649 oidcpy(oid, &ref->old_oid);
650 *rm = ref->next;
651 return 0;
652 }
653
654 static void update_remote_refs(const struct ref *refs,
655 const struct ref *mapped_refs,
656 const struct ref *remote_head_points_at,
657 const char *branch_top,
658 const char *msg,
659 struct transport *transport,
660 int check_connectivity,
661 int check_refs_only)
662 {
663 const struct ref *rm = mapped_refs;
664
665 if (check_connectivity) {
666 struct check_connected_options opt = CHECK_CONNECTED_INIT;
667
668 opt.transport = transport;
669 opt.progress = transport->progress;
670 opt.check_refs_only = !!check_refs_only;
671
672 if (check_connected(iterate_ref_map, &rm, &opt))
673 die(_("remote did not send all necessary objects"));
674 }
675
676 if (refs) {
677 write_remote_refs(mapped_refs);
678 if (option_single_branch && !option_no_tags)
679 write_followtags(refs, msg);
680 }
681
682 if (remote_head_points_at && !option_bare) {
683 struct strbuf head_ref = STRBUF_INIT;
684 strbuf_addstr(&head_ref, branch_top);
685 strbuf_addstr(&head_ref, "HEAD");
686 if (create_symref(head_ref.buf,
687 remote_head_points_at->peer_ref->name,
688 msg) < 0)
689 die(_("unable to update %s"), head_ref.buf);
690 strbuf_release(&head_ref);
691 }
692 }
693
694 static void update_head(const struct ref *our, const struct ref *remote,
695 const char *msg)
696 {
697 const char *head;
698 if (our && skip_prefix(our->name, "refs/heads/", &head)) {
699 /* Local default branch link */
700 if (create_symref("HEAD", our->name, NULL) < 0)
701 die(_("unable to update HEAD"));
702 if (!option_bare) {
703 update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
704 UPDATE_REFS_DIE_ON_ERR);
705 install_branch_config(0, head, option_origin, our->name);
706 }
707 } else if (our) {
708 struct commit *c = lookup_commit_reference(the_repository,
709 &our->old_oid);
710 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
711 update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
712 UPDATE_REFS_DIE_ON_ERR);
713 } else if (remote) {
714 /*
715 * We know remote HEAD points to a non-branch, or
716 * HEAD points to a branch but we don't know which one.
717 * Detach HEAD in all these cases.
718 */
719 update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
720 UPDATE_REFS_DIE_ON_ERR);
721 }
722 }
723
724 static int checkout(int submodule_progress)
725 {
726 struct object_id oid;
727 char *head;
728 struct lock_file lock_file = LOCK_INIT;
729 struct unpack_trees_options opts;
730 struct tree *tree;
731 struct tree_desc t;
732 int err = 0;
733
734 if (option_no_checkout)
735 return 0;
736
737 head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
738 if (!head) {
739 warning(_("remote HEAD refers to nonexistent ref, "
740 "unable to checkout.\n"));
741 return 0;
742 }
743 if (!strcmp(head, "HEAD")) {
744 if (advice_detached_head)
745 detach_advice(oid_to_hex(&oid));
746 } else {
747 if (!starts_with(head, "refs/heads/"))
748 die(_("HEAD not found below refs/heads!"));
749 }
750 free(head);
751
752 /* We need to be in the new work tree for the checkout */
753 setup_work_tree();
754
755 hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
756
757 memset(&opts, 0, sizeof opts);
758 opts.update = 1;
759 opts.merge = 1;
760 opts.clone = 1;
761 opts.fn = oneway_merge;
762 opts.verbose_update = (option_verbosity >= 0);
763 opts.src_index = &the_index;
764 opts.dst_index = &the_index;
765
766 tree = parse_tree_indirect(&oid);
767 parse_tree(tree);
768 init_tree_desc(&t, tree->buffer, tree->size);
769 if (unpack_trees(1, &t, &opts) < 0)
770 die(_("unable to checkout working tree"));
771
772 if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
773 die(_("unable to write new index file"));
774
775 err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
776 oid_to_hex(&oid), "1", NULL);
777
778 if (!err && (option_recurse_submodules.nr > 0)) {
779 struct argv_array args = ARGV_ARRAY_INIT;
780 argv_array_pushl(&args, "submodule", "update", "--init", "--recursive", NULL);
781
782 if (option_shallow_submodules == 1)
783 argv_array_push(&args, "--depth=1");
784
785 if (max_jobs != -1)
786 argv_array_pushf(&args, "--jobs=%d", max_jobs);
787
788 if (submodule_progress)
789 argv_array_push(&args, "--progress");
790
791 if (option_verbosity < 0)
792 argv_array_push(&args, "--quiet");
793
794 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
795 argv_array_clear(&args);
796 }
797
798 return err;
799 }
800
801 static int write_one_config(const char *key, const char *value, void *data)
802 {
803 return git_config_set_multivar_gently(key,
804 value ? value : "true",
805 CONFIG_REGEX_NONE, 0);
806 }
807
808 static void write_config(struct string_list *config)
809 {
810 int i;
811
812 for (i = 0; i < config->nr; i++) {
813 if (git_config_parse_parameter(config->items[i].string,
814 write_one_config, NULL) < 0)
815 die(_("unable to write parameters to config file"));
816 }
817 }
818
819 static void write_refspec_config(const char *src_ref_prefix,
820 const struct ref *our_head_points_at,
821 const struct ref *remote_head_points_at,
822 struct strbuf *branch_top)
823 {
824 struct strbuf key = STRBUF_INIT;
825 struct strbuf value = STRBUF_INIT;
826
827 if (option_mirror || !option_bare) {
828 if (option_single_branch && !option_mirror) {
829 if (option_branch) {
830 if (starts_with(our_head_points_at->name, "refs/tags/"))
831 strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
832 our_head_points_at->name);
833 else
834 strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
835 branch_top->buf, option_branch);
836 } else if (remote_head_points_at) {
837 const char *head = remote_head_points_at->name;
838 if (!skip_prefix(head, "refs/heads/", &head))
839 BUG("remote HEAD points at non-head?");
840
841 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
842 branch_top->buf, head);
843 }
844 /*
845 * otherwise, the next "git fetch" will
846 * simply fetch from HEAD without updating
847 * any remote-tracking branch, which is what
848 * we want.
849 */
850 } else {
851 strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
852 }
853 /* Configure the remote */
854 if (value.len) {
855 strbuf_addf(&key, "remote.%s.fetch", option_origin);
856 git_config_set_multivar(key.buf, value.buf, "^$", 0);
857 strbuf_reset(&key);
858
859 if (option_mirror) {
860 strbuf_addf(&key, "remote.%s.mirror", option_origin);
861 git_config_set(key.buf, "true");
862 strbuf_reset(&key);
863 }
864 }
865 }
866
867 strbuf_release(&key);
868 strbuf_release(&value);
869 }
870
871 static void dissociate_from_references(void)
872 {
873 static const char* argv[] = { "repack", "-a", "-d", NULL };
874 char *alternates = git_pathdup("objects/info/alternates");
875
876 if (!access(alternates, F_OK)) {
877 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
878 die(_("cannot repack to clean up"));
879 if (unlink(alternates) && errno != ENOENT)
880 die_errno(_("cannot unlink temporary alternates file"));
881 }
882 free(alternates);
883 }
884
885 static int dir_exists(const char *path)
886 {
887 struct stat sb;
888 return !stat(path, &sb);
889 }
890
891 int cmd_clone(int argc, const char **argv, const char *prefix)
892 {
893 int is_bundle = 0, is_local;
894 const char *repo_name, *repo, *work_tree, *git_dir;
895 char *path, *dir;
896 int dest_exists;
897 const struct ref *refs, *remote_head;
898 const struct ref *remote_head_points_at;
899 const struct ref *our_head_points_at;
900 struct ref *mapped_refs;
901 const struct ref *ref;
902 struct strbuf key = STRBUF_INIT;
903 struct strbuf default_refspec = STRBUF_INIT;
904 struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
905 struct transport *transport = NULL;
906 const char *src_ref_prefix = "refs/heads/";
907 struct remote *remote;
908 int err = 0, complete_refs_before_fetch = 1;
909 int submodule_progress;
910
911 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
912
913 fetch_if_missing = 0;
914
915 packet_trace_identity("clone");
916 argc = parse_options(argc, argv, prefix, builtin_clone_options,
917 builtin_clone_usage, 0);
918
919 if (argc > 2)
920 usage_msg_opt(_("Too many arguments."),
921 builtin_clone_usage, builtin_clone_options);
922
923 if (argc == 0)
924 usage_msg_opt(_("You must specify a repository to clone."),
925 builtin_clone_usage, builtin_clone_options);
926
927 if (option_depth || option_since || option_not.nr)
928 deepen = 1;
929 if (option_single_branch == -1)
930 option_single_branch = deepen ? 1 : 0;
931
932 if (option_mirror)
933 option_bare = 1;
934
935 if (option_bare) {
936 if (option_origin)
937 die(_("--bare and --origin %s options are incompatible."),
938 option_origin);
939 if (real_git_dir)
940 die(_("--bare and --separate-git-dir are incompatible."));
941 option_no_checkout = 1;
942 }
943
944 if (!option_origin)
945 option_origin = "origin";
946
947 repo_name = argv[0];
948
949 path = get_repo_path(repo_name, &is_bundle);
950 if (path)
951 repo = absolute_pathdup(repo_name);
952 else if (!strchr(repo_name, ':'))
953 die(_("repository '%s' does not exist"), repo_name);
954 else
955 repo = repo_name;
956
957 /* no need to be strict, transport_set_option() will validate it again */
958 if (option_depth && atoi(option_depth) < 1)
959 die(_("depth %s is not a positive number"), option_depth);
960
961 if (argc == 2)
962 dir = xstrdup(argv[1]);
963 else
964 dir = guess_dir_name(repo_name, is_bundle, option_bare);
965 strip_trailing_slashes(dir);
966
967 dest_exists = dir_exists(dir);
968 if (dest_exists && !is_empty_dir(dir))
969 die(_("destination path '%s' already exists and is not "
970 "an empty directory."), dir);
971
972 strbuf_addf(&reflog_msg, "clone: from %s", repo);
973
974 if (option_bare)
975 work_tree = NULL;
976 else {
977 work_tree = getenv("GIT_WORK_TREE");
978 if (work_tree && dir_exists(work_tree))
979 die(_("working tree '%s' already exists."), work_tree);
980 }
981
982 if (option_bare || work_tree)
983 git_dir = xstrdup(dir);
984 else {
985 work_tree = dir;
986 git_dir = mkpathdup("%s/.git", dir);
987 }
988
989 atexit(remove_junk);
990 sigchain_push_common(remove_junk_on_signal);
991
992 if (!option_bare) {
993 if (safe_create_leading_directories_const(work_tree) < 0)
994 die_errno(_("could not create leading directories of '%s'"),
995 work_tree);
996 if (dest_exists)
997 junk_work_tree_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
998 else if (mkdir(work_tree, 0777))
999 die_errno(_("could not create work tree dir '%s'"),
1000 work_tree);
1001 junk_work_tree = work_tree;
1002 set_git_work_tree(work_tree);
1003 }
1004
1005 if (real_git_dir) {
1006 if (dir_exists(real_git_dir))
1007 junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1008 junk_git_dir = real_git_dir;
1009 } else {
1010 if (dest_exists)
1011 junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1012 junk_git_dir = git_dir;
1013 }
1014 if (safe_create_leading_directories_const(git_dir) < 0)
1015 die(_("could not create leading directories of '%s'"), git_dir);
1016
1017 if (0 <= option_verbosity) {
1018 if (option_bare)
1019 fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
1020 else
1021 fprintf(stderr, _("Cloning into '%s'...\n"), dir);
1022 }
1023
1024 if (option_recurse_submodules.nr > 0) {
1025 struct string_list_item *item;
1026 struct strbuf sb = STRBUF_INIT;
1027
1028 /* remove duplicates */
1029 string_list_sort(&option_recurse_submodules);
1030 string_list_remove_duplicates(&option_recurse_submodules, 0);
1031
1032 /*
1033 * NEEDSWORK: In a multi-working-tree world, this needs to be
1034 * set in the per-worktree config.
1035 */
1036 for_each_string_list_item(item, &option_recurse_submodules) {
1037 strbuf_addf(&sb, "submodule.active=%s",
1038 item->string);
1039 string_list_append(&option_config,
1040 strbuf_detach(&sb, NULL));
1041 }
1042
1043 if (option_required_reference.nr &&
1044 option_optional_reference.nr)
1045 die(_("clone --recursive is not compatible with "
1046 "both --reference and --reference-if-able"));
1047 else if (option_required_reference.nr) {
1048 string_list_append(&option_config,
1049 "submodule.alternateLocation=superproject");
1050 string_list_append(&option_config,
1051 "submodule.alternateErrorStrategy=die");
1052 } else if (option_optional_reference.nr) {
1053 string_list_append(&option_config,
1054 "submodule.alternateLocation=superproject");
1055 string_list_append(&option_config,
1056 "submodule.alternateErrorStrategy=info");
1057 }
1058 }
1059
1060 init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
1061
1062 if (real_git_dir)
1063 git_dir = real_git_dir;
1064
1065 write_config(&option_config);
1066
1067 git_config(git_default_config, NULL);
1068
1069 if (option_bare) {
1070 if (option_mirror)
1071 src_ref_prefix = "refs/";
1072 strbuf_addstr(&branch_top, src_ref_prefix);
1073
1074 git_config_set("core.bare", "true");
1075 } else {
1076 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1077 }
1078
1079 strbuf_addf(&key, "remote.%s.url", option_origin);
1080 git_config_set(key.buf, repo);
1081 strbuf_reset(&key);
1082
1083 if (option_no_tags) {
1084 strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
1085 git_config_set(key.buf, "--no-tags");
1086 strbuf_reset(&key);
1087 }
1088
1089 if (option_required_reference.nr || option_optional_reference.nr)
1090 setup_reference();
1091
1092 remote = remote_get(option_origin);
1093
1094 strbuf_addf(&default_refspec, "+%s*:%s*", src_ref_prefix,
1095 branch_top.buf);
1096 refspec_append(&remote->fetch, default_refspec.buf);
1097
1098 transport = transport_get(remote, remote->url[0]);
1099 transport_set_verbosity(transport, option_verbosity, option_progress);
1100 transport->family = family;
1101
1102 path = get_repo_path(remote->url[0], &is_bundle);
1103 is_local = option_local != 0 && path && !is_bundle;
1104 if (is_local) {
1105 if (option_depth)
1106 warning(_("--depth is ignored in local clones; use file:// instead."));
1107 if (option_since)
1108 warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1109 if (option_not.nr)
1110 warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1111 if (filter_options.choice)
1112 warning(_("--filter is ignored in local clones; use file:// instead."));
1113 if (!access(mkpath("%s/shallow", path), F_OK)) {
1114 if (option_local > 0)
1115 warning(_("source repository is shallow, ignoring --local"));
1116 is_local = 0;
1117 }
1118 }
1119 if (option_local > 0 && !is_local)
1120 warning(_("--local is ignored"));
1121 transport->cloning = 1;
1122
1123 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1124
1125 if (option_depth)
1126 transport_set_option(transport, TRANS_OPT_DEPTH,
1127 option_depth);
1128 if (option_since)
1129 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1130 option_since);
1131 if (option_not.nr)
1132 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1133 (const char *)&option_not);
1134 if (option_single_branch)
1135 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1136
1137 if (option_upload_pack)
1138 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1139 option_upload_pack);
1140
1141 if (server_options.nr)
1142 transport->server_options = &server_options;
1143
1144 if (filter_options.choice) {
1145 struct strbuf expanded_filter_spec = STRBUF_INIT;
1146 expand_list_objects_filter_spec(&filter_options,
1147 &expanded_filter_spec);
1148 transport_set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1149 expanded_filter_spec.buf);
1150 transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1151 strbuf_release(&expanded_filter_spec);
1152 }
1153
1154 if (transport->smart_options && !deepen && !filter_options.choice)
1155 transport->smart_options->check_self_contained_and_connected = 1;
1156
1157
1158 argv_array_push(&ref_prefixes, "HEAD");
1159 refspec_ref_prefixes(&remote->fetch, &ref_prefixes);
1160 if (option_branch)
1161 expand_ref_prefix(&ref_prefixes, option_branch);
1162 if (!option_no_tags)
1163 argv_array_push(&ref_prefixes, "refs/tags/");
1164
1165 refs = transport_get_remote_refs(transport, &ref_prefixes);
1166
1167 if (refs) {
1168 mapped_refs = wanted_peer_refs(refs, &remote->fetch);
1169 /*
1170 * transport_get_remote_refs() may return refs with null sha-1
1171 * in mapped_refs (see struct transport->get_refs_list
1172 * comment). In that case we need fetch it early because
1173 * remote_head code below relies on it.
1174 *
1175 * for normal clones, transport_get_remote_refs() should
1176 * return reliable ref set, we can delay cloning until after
1177 * remote HEAD check.
1178 */
1179 for (ref = refs; ref; ref = ref->next)
1180 if (is_null_oid(&ref->old_oid)) {
1181 complete_refs_before_fetch = 0;
1182 break;
1183 }
1184
1185 if (!is_local && !complete_refs_before_fetch)
1186 transport_fetch_refs(transport, mapped_refs);
1187
1188 remote_head = find_ref_by_name(refs, "HEAD");
1189 remote_head_points_at =
1190 guess_remote_head(remote_head, mapped_refs, 0);
1191
1192 if (option_branch) {
1193 our_head_points_at =
1194 find_remote_branch(mapped_refs, option_branch);
1195
1196 if (!our_head_points_at)
1197 die(_("Remote branch %s not found in upstream %s"),
1198 option_branch, option_origin);
1199 }
1200 else
1201 our_head_points_at = remote_head_points_at;
1202 }
1203 else {
1204 if (option_branch)
1205 die(_("Remote branch %s not found in upstream %s"),
1206 option_branch, option_origin);
1207
1208 warning(_("You appear to have cloned an empty repository."));
1209 mapped_refs = NULL;
1210 our_head_points_at = NULL;
1211 remote_head_points_at = NULL;
1212 remote_head = NULL;
1213 option_no_checkout = 1;
1214 if (!option_bare)
1215 install_branch_config(0, "master", option_origin,
1216 "refs/heads/master");
1217 }
1218
1219 write_refspec_config(src_ref_prefix, our_head_points_at,
1220 remote_head_points_at, &branch_top);
1221
1222 if (filter_options.choice)
1223 partial_clone_register("origin", &filter_options);
1224
1225 if (is_local)
1226 clone_local(path, git_dir);
1227 else if (refs && complete_refs_before_fetch)
1228 transport_fetch_refs(transport, mapped_refs);
1229
1230 update_remote_refs(refs, mapped_refs, remote_head_points_at,
1231 branch_top.buf, reflog_msg.buf, transport,
1232 !is_local, filter_options.choice);
1233
1234 update_head(our_head_points_at, remote_head, reflog_msg.buf);
1235
1236 /*
1237 * We want to show progress for recursive submodule clones iff
1238 * we did so for the main clone. But only the transport knows
1239 * the final decision for this flag, so we need to rescue the value
1240 * before we free the transport.
1241 */
1242 submodule_progress = transport->progress;
1243
1244 transport_unlock_pack(transport);
1245 transport_disconnect(transport);
1246
1247 if (option_dissociate) {
1248 close_all_packs(the_repository->objects);
1249 dissociate_from_references();
1250 }
1251
1252 junk_mode = JUNK_LEAVE_REPO;
1253 fetch_if_missing = 1;
1254 err = checkout(submodule_progress);
1255
1256 strbuf_release(&reflog_msg);
1257 strbuf_release(&branch_top);
1258 strbuf_release(&key);
1259 strbuf_release(&default_refspec);
1260 junk_mode = JUNK_LEAVE_ALL;
1261
1262 argv_array_clear(&ref_prefixes);
1263 return err;
1264 }