Merge branch 'hw/commit-advise-while-rejecting' into maint
[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 "dir-iterator.h"
27 #include "iterator.h"
28 #include "sigchain.h"
29 #include "branch.h"
30 #include "remote.h"
31 #include "run-command.h"
32 #include "connected.h"
33 #include "packfile.h"
34 #include "list-objects-filter-options.h"
35
36 /*
37  * Overall FIXMEs:
38  *  - respect DB_ENVIRONMENT for .git/objects.
39  *
40  * Implementation notes:
41  *  - dropping use-separate-remote and no-separate-remote compatibility
42  *
43  */
44 static const char * const builtin_clone_usage[] = {
45         N_("git clone [<options>] [--] <repo> [<dir>]"),
46         NULL
47 };
48
49 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
50 static int option_local = -1, option_no_hardlinks, option_shared;
51 static int option_no_tags;
52 static int option_shallow_submodules;
53 static int deepen;
54 static char *option_template, *option_depth, *option_since;
55 static char *option_origin = NULL;
56 static char *option_branch = NULL;
57 static struct string_list option_not = STRING_LIST_INIT_NODUP;
58 static const char *real_git_dir;
59 static char *option_upload_pack = "git-upload-pack";
60 static int option_verbosity;
61 static int option_progress = -1;
62 static int option_sparse_checkout;
63 static enum transport_family family;
64 static struct string_list option_config = STRING_LIST_INIT_NODUP;
65 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
66 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
67 static int option_dissociate;
68 static int max_jobs = -1;
69 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
70 static struct list_objects_filter_options filter_options;
71 static struct string_list server_options = STRING_LIST_INIT_NODUP;
72 static int option_remote_submodules;
73
74 static int recurse_submodules_cb(const struct option *opt,
75                                  const char *arg, int unset)
76 {
77         if (unset)
78                 string_list_clear((struct string_list *)opt->value, 0);
79         else if (arg)
80                 string_list_append((struct string_list *)opt->value, arg);
81         else
82                 string_list_append((struct string_list *)opt->value,
83                                    (const char *)opt->defval);
84
85         return 0;
86 }
87
88 static struct option builtin_clone_options[] = {
89         OPT__VERBOSITY(&option_verbosity),
90         OPT_BOOL(0, "progress", &option_progress,
91                  N_("force progress reporting")),
92         OPT_BOOL('n', "no-checkout", &option_no_checkout,
93                  N_("don't create a checkout")),
94         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
95         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
96                         N_("create a bare repository")),
97         OPT_BOOL(0, "mirror", &option_mirror,
98                  N_("create a mirror repository (implies bare)")),
99         OPT_BOOL('l', "local", &option_local,
100                 N_("to clone from a local repository")),
101         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
102                     N_("don't use local hardlinks, always copy")),
103         OPT_BOOL('s', "shared", &option_shared,
104                     N_("setup as shared repository")),
105         OPT_ALIAS(0, "recursive", "recurse-submodules"),
106         { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
107           N_("pathspec"), N_("initialize submodules in the clone"),
108           PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
109         OPT_INTEGER('j', "jobs", &max_jobs,
110                     N_("number of submodules cloned in parallel")),
111         OPT_STRING(0, "template", &option_template, N_("template-directory"),
112                    N_("directory from which templates will be used")),
113         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
114                         N_("reference repository")),
115         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
116                         N_("repo"), N_("reference repository")),
117         OPT_BOOL(0, "dissociate", &option_dissociate,
118                  N_("use --reference only while cloning")),
119         OPT_STRING('o', "origin", &option_origin, N_("name"),
120                    N_("use <name> instead of 'origin' to track upstream")),
121         OPT_STRING('b', "branch", &option_branch, N_("branch"),
122                    N_("checkout <branch> instead of the remote's HEAD")),
123         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
124                    N_("path to git-upload-pack on the remote")),
125         OPT_STRING(0, "depth", &option_depth, N_("depth"),
126                     N_("create a shallow clone of that depth")),
127         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
128                     N_("create a shallow clone since a specific time")),
129         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
130                         N_("deepen history of shallow clone, excluding rev")),
131         OPT_BOOL(0, "single-branch", &option_single_branch,
132                     N_("clone only one branch, HEAD or --branch")),
133         OPT_BOOL(0, "no-tags", &option_no_tags,
134                  N_("don't clone any tags, and make later fetches not to follow them")),
135         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
136                     N_("any cloned submodules will be shallow")),
137         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
138                    N_("separate git dir from working tree")),
139         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
140                         N_("set config inside the new repository")),
141         OPT_STRING_LIST(0, "server-option", &server_options,
142                         N_("server-specific"), N_("option to transmit")),
143         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
144                         TRANSPORT_FAMILY_IPV4),
145         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
146                         TRANSPORT_FAMILY_IPV6),
147         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
148         OPT_BOOL(0, "remote-submodules", &option_remote_submodules,
149                     N_("any cloned submodules will use their remote-tracking branch")),
150         OPT_BOOL(0, "sparse", &option_sparse_checkout,
151                     N_("initialize sparse-checkout file to include only files at root")),
152         OPT_END()
153 };
154
155 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
156 {
157         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
158         static char *bundle_suffix[] = { ".bundle", "" };
159         size_t baselen = path->len;
160         struct stat st;
161         int i;
162
163         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
164                 strbuf_setlen(path, baselen);
165                 strbuf_addstr(path, suffix[i]);
166                 if (stat(path->buf, &st))
167                         continue;
168                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
169                         *is_bundle = 0;
170                         return path->buf;
171                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
172                         /* Is it a "gitfile"? */
173                         char signature[8];
174                         const char *dst;
175                         int len, fd = open(path->buf, O_RDONLY);
176                         if (fd < 0)
177                                 continue;
178                         len = read_in_full(fd, signature, 8);
179                         close(fd);
180                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
181                                 continue;
182                         dst = read_gitfile(path->buf);
183                         if (dst) {
184                                 *is_bundle = 0;
185                                 return dst;
186                         }
187                 }
188         }
189
190         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
191                 strbuf_setlen(path, baselen);
192                 strbuf_addstr(path, bundle_suffix[i]);
193                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
194                         *is_bundle = 1;
195                         return path->buf;
196                 }
197         }
198
199         return NULL;
200 }
201
202 static char *get_repo_path(const char *repo, int *is_bundle)
203 {
204         struct strbuf path = STRBUF_INIT;
205         const char *raw;
206         char *canon;
207
208         strbuf_addstr(&path, repo);
209         raw = get_repo_path_1(&path, is_bundle);
210         canon = raw ? absolute_pathdup(raw) : NULL;
211         strbuf_release(&path);
212         return canon;
213 }
214
215 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
216 {
217         const char *end = repo + strlen(repo), *start, *ptr;
218         size_t len;
219         char *dir;
220
221         /*
222          * Skip scheme.
223          */
224         start = strstr(repo, "://");
225         if (start == NULL)
226                 start = repo;
227         else
228                 start += 3;
229
230         /*
231          * Skip authentication data. The stripping does happen
232          * greedily, such that we strip up to the last '@' inside
233          * the host part.
234          */
235         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
236                 if (*ptr == '@')
237                         start = ptr + 1;
238         }
239
240         /*
241          * Strip trailing spaces, slashes and /.git
242          */
243         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
244                 end--;
245         if (end - start > 5 && is_dir_sep(end[-5]) &&
246             !strncmp(end - 4, ".git", 4)) {
247                 end -= 5;
248                 while (start < end && is_dir_sep(end[-1]))
249                         end--;
250         }
251
252         /*
253          * Strip trailing port number if we've got only a
254          * hostname (that is, there is no dir separator but a
255          * colon). This check is required such that we do not
256          * strip URI's like '/foo/bar:2222.git', which should
257          * result in a dir '2222' being guessed due to backwards
258          * compatibility.
259          */
260         if (memchr(start, '/', end - start) == NULL
261             && memchr(start, ':', end - start) != NULL) {
262                 ptr = end;
263                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
264                         ptr--;
265                 if (start < ptr && ptr[-1] == ':')
266                         end = ptr - 1;
267         }
268
269         /*
270          * Find last component. To remain backwards compatible we
271          * also regard colons as path separators, such that
272          * cloning a repository 'foo:bar.git' would result in a
273          * directory 'bar' being guessed.
274          */
275         ptr = end;
276         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
277                 ptr--;
278         start = ptr;
279
280         /*
281          * Strip .{bundle,git}.
282          */
283         len = end - start;
284         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
285
286         if (!len || (len == 1 && *start == '/'))
287                 die(_("No directory name could be guessed.\n"
288                       "Please specify a directory on the command line"));
289
290         if (is_bare)
291                 dir = xstrfmt("%.*s.git", (int)len, start);
292         else
293                 dir = xstrndup(start, len);
294         /*
295          * Replace sequences of 'control' characters and whitespace
296          * with one ascii space, remove leading and trailing spaces.
297          */
298         if (*dir) {
299                 char *out = dir;
300                 int prev_space = 1 /* strip leading whitespace */;
301                 for (end = dir; *end; ++end) {
302                         char ch = *end;
303                         if ((unsigned char)ch < '\x20')
304                                 ch = '\x20';
305                         if (isspace(ch)) {
306                                 if (prev_space)
307                                         continue;
308                                 prev_space = 1;
309                         } else
310                                 prev_space = 0;
311                         *out++ = ch;
312                 }
313                 *out = '\0';
314                 if (out > dir && prev_space)
315                         out[-1] = '\0';
316         }
317         return dir;
318 }
319
320 static void strip_trailing_slashes(char *dir)
321 {
322         char *end = dir + strlen(dir);
323
324         while (dir < end - 1 && is_dir_sep(end[-1]))
325                 end--;
326         *end = '\0';
327 }
328
329 static int add_one_reference(struct string_list_item *item, void *cb_data)
330 {
331         struct strbuf err = STRBUF_INIT;
332         int *required = cb_data;
333         char *ref_git = compute_alternate_path(item->string, &err);
334
335         if (!ref_git) {
336                 if (*required)
337                         die("%s", err.buf);
338                 else
339                         fprintf(stderr,
340                                 _("info: Could not add alternate for '%s': %s\n"),
341                                 item->string, err.buf);
342         } else {
343                 struct strbuf sb = STRBUF_INIT;
344                 strbuf_addf(&sb, "%s/objects", ref_git);
345                 add_to_alternates_file(sb.buf);
346                 strbuf_release(&sb);
347         }
348
349         strbuf_release(&err);
350         free(ref_git);
351         return 0;
352 }
353
354 static void setup_reference(void)
355 {
356         int required = 1;
357         for_each_string_list(&option_required_reference,
358                              add_one_reference, &required);
359         required = 0;
360         for_each_string_list(&option_optional_reference,
361                              add_one_reference, &required);
362 }
363
364 static void copy_alternates(struct strbuf *src, const char *src_repo)
365 {
366         /*
367          * Read from the source objects/info/alternates file
368          * and copy the entries to corresponding file in the
369          * destination repository with add_to_alternates_file().
370          * Both src and dst have "$path/objects/info/alternates".
371          *
372          * Instead of copying bit-for-bit from the original,
373          * we need to append to existing one so that the already
374          * created entry via "clone -s" is not lost, and also
375          * to turn entries with paths relative to the original
376          * absolute, so that they can be used in the new repository.
377          */
378         FILE *in = xfopen(src->buf, "r");
379         struct strbuf line = STRBUF_INIT;
380
381         while (strbuf_getline(&line, in) != EOF) {
382                 char *abs_path;
383                 if (!line.len || line.buf[0] == '#')
384                         continue;
385                 if (is_absolute_path(line.buf)) {
386                         add_to_alternates_file(line.buf);
387                         continue;
388                 }
389                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
390                 if (!normalize_path_copy(abs_path, abs_path))
391                         add_to_alternates_file(abs_path);
392                 else
393                         warning("skipping invalid relative alternate: %s/%s",
394                                 src_repo, line.buf);
395                 free(abs_path);
396         }
397         strbuf_release(&line);
398         fclose(in);
399 }
400
401 static void mkdir_if_missing(const char *pathname, mode_t mode)
402 {
403         struct stat st;
404
405         if (!mkdir(pathname, mode))
406                 return;
407
408         if (errno != EEXIST)
409                 die_errno(_("failed to create directory '%s'"), pathname);
410         else if (stat(pathname, &st))
411                 die_errno(_("failed to stat '%s'"), pathname);
412         else if (!S_ISDIR(st.st_mode))
413                 die(_("%s exists and is not a directory"), pathname);
414 }
415
416 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
417                                    const char *src_repo)
418 {
419         int src_len, dest_len;
420         struct dir_iterator *iter;
421         int iter_status;
422         unsigned int flags;
423
424         mkdir_if_missing(dest->buf, 0777);
425
426         flags = DIR_ITERATOR_PEDANTIC | DIR_ITERATOR_FOLLOW_SYMLINKS;
427         iter = dir_iterator_begin(src->buf, flags);
428
429         if (!iter)
430                 die_errno(_("failed to start iterator over '%s'"), src->buf);
431
432         strbuf_addch(src, '/');
433         src_len = src->len;
434         strbuf_addch(dest, '/');
435         dest_len = dest->len;
436
437         while ((iter_status = dir_iterator_advance(iter)) == ITER_OK) {
438                 strbuf_setlen(src, src_len);
439                 strbuf_addstr(src, iter->relative_path);
440                 strbuf_setlen(dest, dest_len);
441                 strbuf_addstr(dest, iter->relative_path);
442
443                 if (S_ISDIR(iter->st.st_mode)) {
444                         mkdir_if_missing(dest->buf, 0777);
445                         continue;
446                 }
447
448                 /* Files that cannot be copied bit-for-bit... */
449                 if (!fspathcmp(iter->relative_path, "info/alternates")) {
450                         copy_alternates(src, src_repo);
451                         continue;
452                 }
453
454                 if (unlink(dest->buf) && errno != ENOENT)
455                         die_errno(_("failed to unlink '%s'"), dest->buf);
456                 if (!option_no_hardlinks) {
457                         if (!link(real_path(src->buf), dest->buf))
458                                 continue;
459                         if (option_local > 0)
460                                 die_errno(_("failed to create link '%s'"), dest->buf);
461                         option_no_hardlinks = 1;
462                 }
463                 if (copy_file_with_time(dest->buf, src->buf, 0666))
464                         die_errno(_("failed to copy file to '%s'"), dest->buf);
465         }
466
467         if (iter_status != ITER_DONE) {
468                 strbuf_setlen(src, src_len);
469                 die(_("failed to iterate over '%s'"), src->buf);
470         }
471 }
472
473 static void clone_local(const char *src_repo, const char *dest_repo)
474 {
475         if (option_shared) {
476                 struct strbuf alt = STRBUF_INIT;
477                 get_common_dir(&alt, src_repo);
478                 strbuf_addstr(&alt, "/objects");
479                 add_to_alternates_file(alt.buf);
480                 strbuf_release(&alt);
481         } else {
482                 struct strbuf src = STRBUF_INIT;
483                 struct strbuf dest = STRBUF_INIT;
484                 get_common_dir(&src, src_repo);
485                 get_common_dir(&dest, dest_repo);
486                 strbuf_addstr(&src, "/objects");
487                 strbuf_addstr(&dest, "/objects");
488                 copy_or_link_directory(&src, &dest, src_repo);
489                 strbuf_release(&src);
490                 strbuf_release(&dest);
491         }
492
493         if (0 <= option_verbosity)
494                 fprintf(stderr, _("done.\n"));
495 }
496
497 static const char *junk_work_tree;
498 static int junk_work_tree_flags;
499 static const char *junk_git_dir;
500 static int junk_git_dir_flags;
501 static enum {
502         JUNK_LEAVE_NONE,
503         JUNK_LEAVE_REPO,
504         JUNK_LEAVE_ALL
505 } junk_mode = JUNK_LEAVE_NONE;
506
507 static const char junk_leave_repo_msg[] =
508 N_("Clone succeeded, but checkout failed.\n"
509    "You can inspect what was checked out with 'git status'\n"
510    "and retry with 'git restore --source=HEAD :/'\n");
511
512 static void remove_junk(void)
513 {
514         struct strbuf sb = STRBUF_INIT;
515
516         switch (junk_mode) {
517         case JUNK_LEAVE_REPO:
518                 warning("%s", _(junk_leave_repo_msg));
519                 /* fall-through */
520         case JUNK_LEAVE_ALL:
521                 return;
522         default:
523                 /* proceed to removal */
524                 break;
525         }
526
527         if (junk_git_dir) {
528                 strbuf_addstr(&sb, junk_git_dir);
529                 remove_dir_recursively(&sb, junk_git_dir_flags);
530                 strbuf_reset(&sb);
531         }
532         if (junk_work_tree) {
533                 strbuf_addstr(&sb, junk_work_tree);
534                 remove_dir_recursively(&sb, junk_work_tree_flags);
535         }
536         strbuf_release(&sb);
537 }
538
539 static void remove_junk_on_signal(int signo)
540 {
541         remove_junk();
542         sigchain_pop(signo);
543         raise(signo);
544 }
545
546 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
547 {
548         struct ref *ref;
549         struct strbuf head = STRBUF_INIT;
550         strbuf_addstr(&head, "refs/heads/");
551         strbuf_addstr(&head, branch);
552         ref = find_ref_by_name(refs, head.buf);
553         strbuf_release(&head);
554
555         if (ref)
556                 return ref;
557
558         strbuf_addstr(&head, "refs/tags/");
559         strbuf_addstr(&head, branch);
560         ref = find_ref_by_name(refs, head.buf);
561         strbuf_release(&head);
562
563         return ref;
564 }
565
566 static struct ref *wanted_peer_refs(const struct ref *refs,
567                 struct refspec *refspec)
568 {
569         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
570         struct ref *local_refs = head;
571         struct ref **tail = head ? &head->next : &local_refs;
572
573         if (option_single_branch) {
574                 struct ref *remote_head = NULL;
575
576                 if (!option_branch)
577                         remote_head = guess_remote_head(head, refs, 0);
578                 else {
579                         local_refs = NULL;
580                         tail = &local_refs;
581                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
582                 }
583
584                 if (!remote_head && option_branch)
585                         warning(_("Could not find remote branch %s to clone."),
586                                 option_branch);
587                 else {
588                         int i;
589                         for (i = 0; i < refspec->nr; i++)
590                                 get_fetch_map(remote_head, &refspec->items[i],
591                                               &tail, 0);
592
593                         /* if --branch=tag, pull the requested tag explicitly */
594                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
595                 }
596         } else {
597                 int i;
598                 for (i = 0; i < refspec->nr; i++)
599                         get_fetch_map(refs, &refspec->items[i], &tail, 0);
600         }
601
602         if (!option_mirror && !option_single_branch && !option_no_tags)
603                 get_fetch_map(refs, tag_refspec, &tail, 0);
604
605         return local_refs;
606 }
607
608 static void write_remote_refs(const struct ref *local_refs)
609 {
610         const struct ref *r;
611
612         struct ref_transaction *t;
613         struct strbuf err = STRBUF_INIT;
614
615         t = ref_transaction_begin(&err);
616         if (!t)
617                 die("%s", err.buf);
618
619         for (r = local_refs; r; r = r->next) {
620                 if (!r->peer_ref)
621                         continue;
622                 if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
623                                            0, NULL, &err))
624                         die("%s", err.buf);
625         }
626
627         if (initial_ref_transaction_commit(t, &err))
628                 die("%s", err.buf);
629
630         strbuf_release(&err);
631         ref_transaction_free(t);
632 }
633
634 static void write_followtags(const struct ref *refs, const char *msg)
635 {
636         const struct ref *ref;
637         for (ref = refs; ref; ref = ref->next) {
638                 if (!starts_with(ref->name, "refs/tags/"))
639                         continue;
640                 if (ends_with(ref->name, "^{}"))
641                         continue;
642                 if (!has_object_file(&ref->old_oid))
643                         continue;
644                 update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
645                            UPDATE_REFS_DIE_ON_ERR);
646         }
647 }
648
649 static int iterate_ref_map(void *cb_data, struct object_id *oid)
650 {
651         struct ref **rm = cb_data;
652         struct ref *ref = *rm;
653
654         /*
655          * Skip anything missing a peer_ref, which we are not
656          * actually going to write a ref for.
657          */
658         while (ref && !ref->peer_ref)
659                 ref = ref->next;
660         /* Returning -1 notes "end of list" to the caller. */
661         if (!ref)
662                 return -1;
663
664         oidcpy(oid, &ref->old_oid);
665         *rm = ref->next;
666         return 0;
667 }
668
669 static void update_remote_refs(const struct ref *refs,
670                                const struct ref *mapped_refs,
671                                const struct ref *remote_head_points_at,
672                                const char *branch_top,
673                                const char *msg,
674                                struct transport *transport,
675                                int check_connectivity,
676                                int check_refs_only)
677 {
678         const struct ref *rm = mapped_refs;
679
680         if (check_connectivity) {
681                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
682
683                 opt.transport = transport;
684                 opt.progress = transport->progress;
685                 opt.check_refs_only = !!check_refs_only;
686
687                 if (check_connected(iterate_ref_map, &rm, &opt))
688                         die(_("remote did not send all necessary objects"));
689         }
690
691         if (refs) {
692                 write_remote_refs(mapped_refs);
693                 if (option_single_branch && !option_no_tags)
694                         write_followtags(refs, msg);
695         }
696
697         if (remote_head_points_at && !option_bare) {
698                 struct strbuf head_ref = STRBUF_INIT;
699                 strbuf_addstr(&head_ref, branch_top);
700                 strbuf_addstr(&head_ref, "HEAD");
701                 if (create_symref(head_ref.buf,
702                                   remote_head_points_at->peer_ref->name,
703                                   msg) < 0)
704                         die(_("unable to update %s"), head_ref.buf);
705                 strbuf_release(&head_ref);
706         }
707 }
708
709 static void update_head(const struct ref *our, const struct ref *remote,
710                         const char *msg)
711 {
712         const char *head;
713         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
714                 /* Local default branch link */
715                 if (create_symref("HEAD", our->name, NULL) < 0)
716                         die(_("unable to update HEAD"));
717                 if (!option_bare) {
718                         update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
719                                    UPDATE_REFS_DIE_ON_ERR);
720                         install_branch_config(0, head, option_origin, our->name);
721                 }
722         } else if (our) {
723                 struct commit *c = lookup_commit_reference(the_repository,
724                                                            &our->old_oid);
725                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
726                 update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
727                            UPDATE_REFS_DIE_ON_ERR);
728         } else if (remote) {
729                 /*
730                  * We know remote HEAD points to a non-branch, or
731                  * HEAD points to a branch but we don't know which one.
732                  * Detach HEAD in all these cases.
733                  */
734                 update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
735                            UPDATE_REFS_DIE_ON_ERR);
736         }
737 }
738
739 static int git_sparse_checkout_init(const char *repo)
740 {
741         struct argv_array argv = ARGV_ARRAY_INIT;
742         int result = 0;
743         argv_array_pushl(&argv, "-C", repo, "sparse-checkout", "init", NULL);
744
745         /*
746          * We must apply the setting in the current process
747          * for the later checkout to use the sparse-checkout file.
748          */
749         core_apply_sparse_checkout = 1;
750
751         if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
752                 error(_("failed to initialize sparse-checkout"));
753                 result = 1;
754         }
755
756         argv_array_clear(&argv);
757         return result;
758 }
759
760 static int checkout(int submodule_progress)
761 {
762         struct object_id oid;
763         char *head;
764         struct lock_file lock_file = LOCK_INIT;
765         struct unpack_trees_options opts;
766         struct tree *tree;
767         struct tree_desc t;
768         int err = 0;
769
770         if (option_no_checkout)
771                 return 0;
772
773         head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
774         if (!head) {
775                 warning(_("remote HEAD refers to nonexistent ref, "
776                           "unable to checkout.\n"));
777                 return 0;
778         }
779         if (!strcmp(head, "HEAD")) {
780                 if (advice_detached_head)
781                         detach_advice(oid_to_hex(&oid));
782         } else {
783                 if (!starts_with(head, "refs/heads/"))
784                         die(_("HEAD not found below refs/heads!"));
785         }
786         free(head);
787
788         /* We need to be in the new work tree for the checkout */
789         setup_work_tree();
790
791         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
792
793         memset(&opts, 0, sizeof opts);
794         opts.update = 1;
795         opts.merge = 1;
796         opts.clone = 1;
797         opts.fn = oneway_merge;
798         opts.verbose_update = (option_verbosity >= 0);
799         opts.src_index = &the_index;
800         opts.dst_index = &the_index;
801
802         tree = parse_tree_indirect(&oid);
803         parse_tree(tree);
804         init_tree_desc(&t, tree->buffer, tree->size);
805         if (unpack_trees(1, &t, &opts) < 0)
806                 die(_("unable to checkout working tree"));
807
808         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
809                 die(_("unable to write new index file"));
810
811         err |= run_hook_le(NULL, "post-checkout", oid_to_hex(&null_oid),
812                            oid_to_hex(&oid), "1", NULL);
813
814         if (!err && (option_recurse_submodules.nr > 0)) {
815                 struct argv_array args = ARGV_ARRAY_INIT;
816                 argv_array_pushl(&args, "submodule", "update", "--require-init", "--recursive", NULL);
817
818                 if (option_shallow_submodules == 1)
819                         argv_array_push(&args, "--depth=1");
820
821                 if (max_jobs != -1)
822                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
823
824                 if (submodule_progress)
825                         argv_array_push(&args, "--progress");
826
827                 if (option_verbosity < 0)
828                         argv_array_push(&args, "--quiet");
829
830                 if (option_remote_submodules) {
831                         argv_array_push(&args, "--remote");
832                         argv_array_push(&args, "--no-fetch");
833                 }
834
835                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
836                 argv_array_clear(&args);
837         }
838
839         return err;
840 }
841
842 static int write_one_config(const char *key, const char *value, void *data)
843 {
844         return git_config_set_multivar_gently(key,
845                                               value ? value : "true",
846                                               CONFIG_REGEX_NONE, 0);
847 }
848
849 static void write_config(struct string_list *config)
850 {
851         int i;
852
853         for (i = 0; i < config->nr; i++) {
854                 if (git_config_parse_parameter(config->items[i].string,
855                                                write_one_config, NULL) < 0)
856                         die(_("unable to write parameters to config file"));
857         }
858 }
859
860 static void write_refspec_config(const char *src_ref_prefix,
861                 const struct ref *our_head_points_at,
862                 const struct ref *remote_head_points_at,
863                 struct strbuf *branch_top)
864 {
865         struct strbuf key = STRBUF_INIT;
866         struct strbuf value = STRBUF_INIT;
867
868         if (option_mirror || !option_bare) {
869                 if (option_single_branch && !option_mirror) {
870                         if (option_branch) {
871                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
872                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
873                                                 our_head_points_at->name);
874                                 else
875                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
876                                                 branch_top->buf, option_branch);
877                         } else if (remote_head_points_at) {
878                                 const char *head = remote_head_points_at->name;
879                                 if (!skip_prefix(head, "refs/heads/", &head))
880                                         BUG("remote HEAD points at non-head?");
881
882                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
883                                                 branch_top->buf, head);
884                         }
885                         /*
886                          * otherwise, the next "git fetch" will
887                          * simply fetch from HEAD without updating
888                          * any remote-tracking branch, which is what
889                          * we want.
890                          */
891                 } else {
892                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
893                 }
894                 /* Configure the remote */
895                 if (value.len) {
896                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
897                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
898                         strbuf_reset(&key);
899
900                         if (option_mirror) {
901                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
902                                 git_config_set(key.buf, "true");
903                                 strbuf_reset(&key);
904                         }
905                 }
906         }
907
908         strbuf_release(&key);
909         strbuf_release(&value);
910 }
911
912 static void dissociate_from_references(void)
913 {
914         static const char* argv[] = { "repack", "-a", "-d", NULL };
915         char *alternates = git_pathdup("objects/info/alternates");
916
917         if (!access(alternates, F_OK)) {
918                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
919                         die(_("cannot repack to clean up"));
920                 if (unlink(alternates) && errno != ENOENT)
921                         die_errno(_("cannot unlink temporary alternates file"));
922         }
923         free(alternates);
924 }
925
926 static int path_exists(const char *path)
927 {
928         struct stat sb;
929         return !stat(path, &sb);
930 }
931
932 int cmd_clone(int argc, const char **argv, const char *prefix)
933 {
934         int is_bundle = 0, is_local;
935         const char *repo_name, *repo, *work_tree, *git_dir;
936         char *path, *dir;
937         int dest_exists;
938         const struct ref *refs, *remote_head;
939         const struct ref *remote_head_points_at;
940         const struct ref *our_head_points_at;
941         struct ref *mapped_refs;
942         const struct ref *ref;
943         struct strbuf key = STRBUF_INIT;
944         struct strbuf default_refspec = STRBUF_INIT;
945         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
946         struct transport *transport = NULL;
947         const char *src_ref_prefix = "refs/heads/";
948         struct remote *remote;
949         int err = 0, complete_refs_before_fetch = 1;
950         int submodule_progress;
951
952         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
953
954         packet_trace_identity("clone");
955         argc = parse_options(argc, argv, prefix, builtin_clone_options,
956                              builtin_clone_usage, 0);
957
958         if (argc > 2)
959                 usage_msg_opt(_("Too many arguments."),
960                         builtin_clone_usage, builtin_clone_options);
961
962         if (argc == 0)
963                 usage_msg_opt(_("You must specify a repository to clone."),
964                         builtin_clone_usage, builtin_clone_options);
965
966         if (option_depth || option_since || option_not.nr)
967                 deepen = 1;
968         if (option_single_branch == -1)
969                 option_single_branch = deepen ? 1 : 0;
970
971         if (option_mirror)
972                 option_bare = 1;
973
974         if (option_bare) {
975                 if (option_origin)
976                         die(_("--bare and --origin %s options are incompatible."),
977                             option_origin);
978                 if (real_git_dir)
979                         die(_("--bare and --separate-git-dir are incompatible."));
980                 option_no_checkout = 1;
981         }
982
983         if (!option_origin)
984                 option_origin = "origin";
985
986         repo_name = argv[0];
987
988         path = get_repo_path(repo_name, &is_bundle);
989         if (path)
990                 repo = absolute_pathdup(repo_name);
991         else if (!strchr(repo_name, ':'))
992                 die(_("repository '%s' does not exist"), repo_name);
993         else
994                 repo = repo_name;
995
996         /* no need to be strict, transport_set_option() will validate it again */
997         if (option_depth && atoi(option_depth) < 1)
998                 die(_("depth %s is not a positive number"), option_depth);
999
1000         if (argc == 2)
1001                 dir = xstrdup(argv[1]);
1002         else
1003                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
1004         strip_trailing_slashes(dir);
1005
1006         dest_exists = path_exists(dir);
1007         if (dest_exists && !is_empty_dir(dir))
1008                 die(_("destination path '%s' already exists and is not "
1009                         "an empty directory."), dir);
1010
1011         strbuf_addf(&reflog_msg, "clone: from %s", repo);
1012
1013         if (option_bare)
1014                 work_tree = NULL;
1015         else {
1016                 work_tree = getenv("GIT_WORK_TREE");
1017                 if (work_tree && path_exists(work_tree))
1018                         die(_("working tree '%s' already exists."), work_tree);
1019         }
1020
1021         if (option_bare || work_tree)
1022                 git_dir = xstrdup(dir);
1023         else {
1024                 work_tree = dir;
1025                 git_dir = mkpathdup("%s/.git", dir);
1026         }
1027
1028         atexit(remove_junk);
1029         sigchain_push_common(remove_junk_on_signal);
1030
1031         if (!option_bare) {
1032                 if (safe_create_leading_directories_const(work_tree) < 0)
1033                         die_errno(_("could not create leading directories of '%s'"),
1034                                   work_tree);
1035                 if (dest_exists)
1036                         junk_work_tree_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1037                 else if (mkdir(work_tree, 0777))
1038                         die_errno(_("could not create work tree dir '%s'"),
1039                                   work_tree);
1040                 junk_work_tree = work_tree;
1041                 set_git_work_tree(work_tree);
1042         }
1043
1044         if (real_git_dir) {
1045                 if (path_exists(real_git_dir))
1046                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1047                 junk_git_dir = real_git_dir;
1048         } else {
1049                 if (dest_exists)
1050                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1051                 junk_git_dir = git_dir;
1052         }
1053         if (safe_create_leading_directories_const(git_dir) < 0)
1054                 die(_("could not create leading directories of '%s'"), git_dir);
1055
1056         if (0 <= option_verbosity) {
1057                 if (option_bare)
1058                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
1059                 else
1060                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
1061         }
1062
1063         if (option_recurse_submodules.nr > 0) {
1064                 struct string_list_item *item;
1065                 struct strbuf sb = STRBUF_INIT;
1066
1067                 /* remove duplicates */
1068                 string_list_sort(&option_recurse_submodules);
1069                 string_list_remove_duplicates(&option_recurse_submodules, 0);
1070
1071                 /*
1072                  * NEEDSWORK: In a multi-working-tree world, this needs to be
1073                  * set in the per-worktree config.
1074                  */
1075                 for_each_string_list_item(item, &option_recurse_submodules) {
1076                         strbuf_addf(&sb, "submodule.active=%s",
1077                                     item->string);
1078                         string_list_append(&option_config,
1079                                            strbuf_detach(&sb, NULL));
1080                 }
1081
1082                 if (option_required_reference.nr &&
1083                     option_optional_reference.nr)
1084                         die(_("clone --recursive is not compatible with "
1085                               "both --reference and --reference-if-able"));
1086                 else if (option_required_reference.nr) {
1087                         string_list_append(&option_config,
1088                                 "submodule.alternateLocation=superproject");
1089                         string_list_append(&option_config,
1090                                 "submodule.alternateErrorStrategy=die");
1091                 } else if (option_optional_reference.nr) {
1092                         string_list_append(&option_config,
1093                                 "submodule.alternateLocation=superproject");
1094                         string_list_append(&option_config,
1095                                 "submodule.alternateErrorStrategy=info");
1096                 }
1097         }
1098
1099         init_db(git_dir, real_git_dir, option_template, INIT_DB_QUIET);
1100
1101         if (real_git_dir)
1102                 git_dir = real_git_dir;
1103
1104         write_config(&option_config);
1105
1106         git_config(git_default_config, NULL);
1107
1108         if (option_bare) {
1109                 if (option_mirror)
1110                         src_ref_prefix = "refs/";
1111                 strbuf_addstr(&branch_top, src_ref_prefix);
1112
1113                 git_config_set("core.bare", "true");
1114         } else {
1115                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1116         }
1117
1118         strbuf_addf(&key, "remote.%s.url", option_origin);
1119         git_config_set(key.buf, repo);
1120         strbuf_reset(&key);
1121
1122         if (option_no_tags) {
1123                 strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
1124                 git_config_set(key.buf, "--no-tags");
1125                 strbuf_reset(&key);
1126         }
1127
1128         if (option_required_reference.nr || option_optional_reference.nr)
1129                 setup_reference();
1130
1131         if (option_sparse_checkout && git_sparse_checkout_init(repo))
1132                 return 1;
1133
1134         remote = remote_get(option_origin);
1135
1136         strbuf_addf(&default_refspec, "+%s*:%s*", src_ref_prefix,
1137                     branch_top.buf);
1138         refspec_append(&remote->fetch, default_refspec.buf);
1139
1140         transport = transport_get(remote, remote->url[0]);
1141         transport_set_verbosity(transport, option_verbosity, option_progress);
1142         transport->family = family;
1143
1144         path = get_repo_path(remote->url[0], &is_bundle);
1145         is_local = option_local != 0 && path && !is_bundle;
1146         if (is_local) {
1147                 if (option_depth)
1148                         warning(_("--depth is ignored in local clones; use file:// instead."));
1149                 if (option_since)
1150                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1151                 if (option_not.nr)
1152                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1153                 if (filter_options.choice)
1154                         warning(_("--filter is ignored in local clones; use file:// instead."));
1155                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1156                         if (option_local > 0)
1157                                 warning(_("source repository is shallow, ignoring --local"));
1158                         is_local = 0;
1159                 }
1160         }
1161         if (option_local > 0 && !is_local)
1162                 warning(_("--local is ignored"));
1163         transport->cloning = 1;
1164
1165         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1166
1167         if (option_depth)
1168                 transport_set_option(transport, TRANS_OPT_DEPTH,
1169                                      option_depth);
1170         if (option_since)
1171                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1172                                      option_since);
1173         if (option_not.nr)
1174                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1175                                      (const char *)&option_not);
1176         if (option_single_branch)
1177                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1178
1179         if (option_upload_pack)
1180                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1181                                      option_upload_pack);
1182
1183         if (server_options.nr)
1184                 transport->server_options = &server_options;
1185
1186         if (filter_options.choice) {
1187                 const char *spec =
1188                         expand_list_objects_filter_spec(&filter_options);
1189                 transport_set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1190                                      spec);
1191                 transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1192         }
1193
1194         if (transport->smart_options && !deepen && !filter_options.choice)
1195                 transport->smart_options->check_self_contained_and_connected = 1;
1196
1197
1198         argv_array_push(&ref_prefixes, "HEAD");
1199         refspec_ref_prefixes(&remote->fetch, &ref_prefixes);
1200         if (option_branch)
1201                 expand_ref_prefix(&ref_prefixes, option_branch);
1202         if (!option_no_tags)
1203                 argv_array_push(&ref_prefixes, "refs/tags/");
1204
1205         refs = transport_get_remote_refs(transport, &ref_prefixes);
1206
1207         if (refs) {
1208                 mapped_refs = wanted_peer_refs(refs, &remote->fetch);
1209                 /*
1210                  * transport_get_remote_refs() may return refs with null sha-1
1211                  * in mapped_refs (see struct transport->get_refs_list
1212                  * comment). In that case we need fetch it early because
1213                  * remote_head code below relies on it.
1214                  *
1215                  * for normal clones, transport_get_remote_refs() should
1216                  * return reliable ref set, we can delay cloning until after
1217                  * remote HEAD check.
1218                  */
1219                 for (ref = refs; ref; ref = ref->next)
1220                         if (is_null_oid(&ref->old_oid)) {
1221                                 complete_refs_before_fetch = 0;
1222                                 break;
1223                         }
1224
1225                 if (!is_local && !complete_refs_before_fetch)
1226                         transport_fetch_refs(transport, mapped_refs);
1227
1228                 remote_head = find_ref_by_name(refs, "HEAD");
1229                 remote_head_points_at =
1230                         guess_remote_head(remote_head, mapped_refs, 0);
1231
1232                 if (option_branch) {
1233                         our_head_points_at =
1234                                 find_remote_branch(mapped_refs, option_branch);
1235
1236                         if (!our_head_points_at)
1237                                 die(_("Remote branch %s not found in upstream %s"),
1238                                     option_branch, option_origin);
1239                 }
1240                 else
1241                         our_head_points_at = remote_head_points_at;
1242         }
1243         else {
1244                 if (option_branch)
1245                         die(_("Remote branch %s not found in upstream %s"),
1246                                         option_branch, option_origin);
1247
1248                 warning(_("You appear to have cloned an empty repository."));
1249                 mapped_refs = NULL;
1250                 our_head_points_at = NULL;
1251                 remote_head_points_at = NULL;
1252                 remote_head = NULL;
1253                 option_no_checkout = 1;
1254                 if (!option_bare)
1255                         install_branch_config(0, "master", option_origin,
1256                                               "refs/heads/master");
1257         }
1258
1259         write_refspec_config(src_ref_prefix, our_head_points_at,
1260                         remote_head_points_at, &branch_top);
1261
1262         if (filter_options.choice)
1263                 partial_clone_register(option_origin, &filter_options);
1264
1265         if (is_local)
1266                 clone_local(path, git_dir);
1267         else if (refs && complete_refs_before_fetch)
1268                 transport_fetch_refs(transport, mapped_refs);
1269
1270         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1271                            branch_top.buf, reflog_msg.buf, transport,
1272                            !is_local, filter_options.choice);
1273
1274         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1275
1276         /*
1277          * We want to show progress for recursive submodule clones iff
1278          * we did so for the main clone. But only the transport knows
1279          * the final decision for this flag, so we need to rescue the value
1280          * before we free the transport.
1281          */
1282         submodule_progress = transport->progress;
1283
1284         transport_unlock_pack(transport);
1285         transport_disconnect(transport);
1286
1287         if (option_dissociate) {
1288                 close_object_store(the_repository->objects);
1289                 dissociate_from_references();
1290         }
1291
1292         junk_mode = JUNK_LEAVE_REPO;
1293         err = checkout(submodule_progress);
1294
1295         strbuf_release(&reflog_msg);
1296         strbuf_release(&branch_top);
1297         strbuf_release(&key);
1298         strbuf_release(&default_refspec);
1299         junk_mode = JUNK_LEAVE_ALL;
1300
1301         argv_array_clear(&ref_prefixes);
1302         return err;
1303 }