Merge branch 'jk/merge-file-exit-code' 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 #include "builtin.h"
12 #include "lockfile.h"
13 #include "parse-options.h"
14 #include "fetch-pack.h"
15 #include "refs.h"
16 #include "tree.h"
17 #include "tree-walk.h"
18 #include "unpack-trees.h"
19 #include "transport.h"
20 #include "strbuf.h"
21 #include "dir.h"
22 #include "sigchain.h"
23 #include "branch.h"
24 #include "remote.h"
25 #include "run-command.h"
26 #include "connected.h"
27
28 /*
29  * Overall FIXMEs:
30  *  - respect DB_ENVIRONMENT for .git/objects.
31  *
32  * Implementation notes:
33  *  - dropping use-separate-remote and no-separate-remote compatibility
34  *
35  */
36 static const char * const builtin_clone_usage[] = {
37         N_("git clone [<options>] [--] <repo> [<dir>]"),
38         NULL
39 };
40
41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
43 static char *option_template, *option_depth;
44 static char *option_origin = NULL;
45 static char *option_branch = NULL;
46 static const char *real_git_dir;
47 static char *option_upload_pack = "git-upload-pack";
48 static int option_verbosity;
49 static int option_progress = -1;
50 static struct string_list option_config;
51 static struct string_list option_reference;
52 static int option_dissociate;
53
54 static struct option builtin_clone_options[] = {
55         OPT__VERBOSITY(&option_verbosity),
56         OPT_BOOL(0, "progress", &option_progress,
57                  N_("force progress reporting")),
58         OPT_BOOL('n', "no-checkout", &option_no_checkout,
59                  N_("don't create a checkout")),
60         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
61         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
62                         N_("create a bare repository")),
63         OPT_BOOL(0, "mirror", &option_mirror,
64                  N_("create a mirror repository (implies bare)")),
65         OPT_BOOL('l', "local", &option_local,
66                 N_("to clone from a local repository")),
67         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
68                     N_("don't use local hardlinks, always copy")),
69         OPT_BOOL('s', "shared", &option_shared,
70                     N_("setup as shared repository")),
71         OPT_BOOL(0, "recursive", &option_recursive,
72                     N_("initialize submodules in the clone")),
73         OPT_BOOL(0, "recurse-submodules", &option_recursive,
74                     N_("initialize submodules in the clone")),
75         OPT_STRING(0, "template", &option_template, N_("template-directory"),
76                    N_("directory from which templates will be used")),
77         OPT_STRING_LIST(0, "reference", &option_reference, N_("repo"),
78                         N_("reference repository")),
79         OPT_BOOL(0, "dissociate", &option_dissociate,
80                  N_("use --reference only while cloning")),
81         OPT_STRING('o', "origin", &option_origin, N_("name"),
82                    N_("use <name> instead of 'origin' to track upstream")),
83         OPT_STRING('b', "branch", &option_branch, N_("branch"),
84                    N_("checkout <branch> instead of the remote's HEAD")),
85         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
86                    N_("path to git-upload-pack on the remote")),
87         OPT_STRING(0, "depth", &option_depth, N_("depth"),
88                     N_("create a shallow clone of that depth")),
89         OPT_BOOL(0, "single-branch", &option_single_branch,
90                     N_("clone only one branch, HEAD or --branch")),
91         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
92                    N_("separate git dir from working tree")),
93         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
94                         N_("set config inside the new repository")),
95         OPT_END()
96 };
97
98 static const char *argv_submodule[] = {
99         "submodule", "update", "--init", "--recursive", NULL
100 };
101
102 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
103 {
104         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
105         static char *bundle_suffix[] = { ".bundle", "" };
106         size_t baselen = path->len;
107         struct stat st;
108         int i;
109
110         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
111                 strbuf_setlen(path, baselen);
112                 strbuf_addstr(path, suffix[i]);
113                 if (stat(path->buf, &st))
114                         continue;
115                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
116                         *is_bundle = 0;
117                         return path->buf;
118                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
119                         /* Is it a "gitfile"? */
120                         char signature[8];
121                         const char *dst;
122                         int len, fd = open(path->buf, O_RDONLY);
123                         if (fd < 0)
124                                 continue;
125                         len = read_in_full(fd, signature, 8);
126                         close(fd);
127                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
128                                 continue;
129                         dst = read_gitfile(path->buf);
130                         if (dst) {
131                                 *is_bundle = 0;
132                                 return dst;
133                         }
134                 }
135         }
136
137         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
138                 strbuf_setlen(path, baselen);
139                 strbuf_addstr(path, bundle_suffix[i]);
140                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
141                         *is_bundle = 1;
142                         return path->buf;
143                 }
144         }
145
146         return NULL;
147 }
148
149 static char *get_repo_path(const char *repo, int *is_bundle)
150 {
151         struct strbuf path = STRBUF_INIT;
152         const char *raw;
153         char *canon;
154
155         strbuf_addstr(&path, repo);
156         raw = get_repo_path_1(&path, is_bundle);
157         canon = raw ? xstrdup(absolute_path(raw)) : NULL;
158         strbuf_release(&path);
159         return canon;
160 }
161
162 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
163 {
164         const char *end = repo + strlen(repo), *start, *ptr;
165         size_t len;
166         char *dir;
167
168         /*
169          * Skip scheme.
170          */
171         start = strstr(repo, "://");
172         if (start == NULL)
173                 start = repo;
174         else
175                 start += 3;
176
177         /*
178          * Skip authentication data. The stripping does happen
179          * greedily, such that we strip up to the last '@' inside
180          * the host part.
181          */
182         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
183                 if (*ptr == '@')
184                         start = ptr + 1;
185         }
186
187         /*
188          * Strip trailing spaces, slashes and /.git
189          */
190         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
191                 end--;
192         if (end - start > 5 && is_dir_sep(end[-5]) &&
193             !strncmp(end - 4, ".git", 4)) {
194                 end -= 5;
195                 while (start < end && is_dir_sep(end[-1]))
196                         end--;
197         }
198
199         /*
200          * Strip trailing port number if we've got only a
201          * hostname (that is, there is no dir separator but a
202          * colon). This check is required such that we do not
203          * strip URI's like '/foo/bar:2222.git', which should
204          * result in a dir '2222' being guessed due to backwards
205          * compatibility.
206          */
207         if (memchr(start, '/', end - start) == NULL
208             && memchr(start, ':', end - start) != NULL) {
209                 ptr = end;
210                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
211                         ptr--;
212                 if (start < ptr && ptr[-1] == ':')
213                         end = ptr - 1;
214         }
215
216         /*
217          * Find last component. To remain backwards compatible we
218          * also regard colons as path separators, such that
219          * cloning a repository 'foo:bar.git' would result in a
220          * directory 'bar' being guessed.
221          */
222         ptr = end;
223         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
224                 ptr--;
225         start = ptr;
226
227         /*
228          * Strip .{bundle,git}.
229          */
230         len = end - start;
231         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
232
233         if (!len || (len == 1 && *start == '/'))
234             die("No directory name could be guessed.\n"
235                 "Please specify a directory on the command line");
236
237         if (is_bare)
238                 dir = xstrfmt("%.*s.git", (int)len, start);
239         else
240                 dir = xstrndup(start, len);
241         /*
242          * Replace sequences of 'control' characters and whitespace
243          * with one ascii space, remove leading and trailing spaces.
244          */
245         if (*dir) {
246                 char *out = dir;
247                 int prev_space = 1 /* strip leading whitespace */;
248                 for (end = dir; *end; ++end) {
249                         char ch = *end;
250                         if ((unsigned char)ch < '\x20')
251                                 ch = '\x20';
252                         if (isspace(ch)) {
253                                 if (prev_space)
254                                         continue;
255                                 prev_space = 1;
256                         } else
257                                 prev_space = 0;
258                         *out++ = ch;
259                 }
260                 *out = '\0';
261                 if (out > dir && prev_space)
262                         out[-1] = '\0';
263         }
264         return dir;
265 }
266
267 static void strip_trailing_slashes(char *dir)
268 {
269         char *end = dir + strlen(dir);
270
271         while (dir < end - 1 && is_dir_sep(end[-1]))
272                 end--;
273         *end = '\0';
274 }
275
276 static int add_one_reference(struct string_list_item *item, void *cb_data)
277 {
278         char *ref_git;
279         const char *repo;
280         struct strbuf alternate = STRBUF_INIT;
281
282         /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
283         ref_git = xstrdup(real_path(item->string));
284
285         repo = read_gitfile(ref_git);
286         if (!repo)
287                 repo = read_gitfile(mkpath("%s/.git", ref_git));
288         if (repo) {
289                 free(ref_git);
290                 ref_git = xstrdup(repo);
291         }
292
293         if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
294                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
295                 free(ref_git);
296                 ref_git = ref_git_git;
297         } else if (!is_directory(mkpath("%s/objects", ref_git)))
298                 die(_("reference repository '%s' is not a local repository."),
299                     item->string);
300
301         if (!access(mkpath("%s/shallow", ref_git), F_OK))
302                 die(_("reference repository '%s' is shallow"), item->string);
303
304         if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
305                 die(_("reference repository '%s' is grafted"), item->string);
306
307         strbuf_addf(&alternate, "%s/objects", ref_git);
308         add_to_alternates_file(alternate.buf);
309         strbuf_release(&alternate);
310         free(ref_git);
311         return 0;
312 }
313
314 static void setup_reference(void)
315 {
316         for_each_string_list(&option_reference, add_one_reference, NULL);
317 }
318
319 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
320                             const char *src_repo)
321 {
322         /*
323          * Read from the source objects/info/alternates file
324          * and copy the entries to corresponding file in the
325          * destination repository with add_to_alternates_file().
326          * Both src and dst have "$path/objects/info/alternates".
327          *
328          * Instead of copying bit-for-bit from the original,
329          * we need to append to existing one so that the already
330          * created entry via "clone -s" is not lost, and also
331          * to turn entries with paths relative to the original
332          * absolute, so that they can be used in the new repository.
333          */
334         FILE *in = fopen(src->buf, "r");
335         struct strbuf line = STRBUF_INIT;
336
337         while (strbuf_getline(&line, in, '\n') != EOF) {
338                 char *abs_path;
339                 if (!line.len || line.buf[0] == '#')
340                         continue;
341                 if (is_absolute_path(line.buf)) {
342                         add_to_alternates_file(line.buf);
343                         continue;
344                 }
345                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
346                 normalize_path_copy(abs_path, abs_path);
347                 add_to_alternates_file(abs_path);
348                 free(abs_path);
349         }
350         strbuf_release(&line);
351         fclose(in);
352 }
353
354 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
355                                    const char *src_repo, int src_baselen)
356 {
357         struct dirent *de;
358         struct stat buf;
359         int src_len, dest_len;
360         DIR *dir;
361
362         dir = opendir(src->buf);
363         if (!dir)
364                 die_errno(_("failed to open '%s'"), src->buf);
365
366         if (mkdir(dest->buf, 0777)) {
367                 if (errno != EEXIST)
368                         die_errno(_("failed to create directory '%s'"), dest->buf);
369                 else if (stat(dest->buf, &buf))
370                         die_errno(_("failed to stat '%s'"), dest->buf);
371                 else if (!S_ISDIR(buf.st_mode))
372                         die(_("%s exists and is not a directory"), dest->buf);
373         }
374
375         strbuf_addch(src, '/');
376         src_len = src->len;
377         strbuf_addch(dest, '/');
378         dest_len = dest->len;
379
380         while ((de = readdir(dir)) != NULL) {
381                 strbuf_setlen(src, src_len);
382                 strbuf_addstr(src, de->d_name);
383                 strbuf_setlen(dest, dest_len);
384                 strbuf_addstr(dest, de->d_name);
385                 if (stat(src->buf, &buf)) {
386                         warning (_("failed to stat %s\n"), src->buf);
387                         continue;
388                 }
389                 if (S_ISDIR(buf.st_mode)) {
390                         if (de->d_name[0] != '.')
391                                 copy_or_link_directory(src, dest,
392                                                        src_repo, src_baselen);
393                         continue;
394                 }
395
396                 /* Files that cannot be copied bit-for-bit... */
397                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
398                         copy_alternates(src, dest, src_repo);
399                         continue;
400                 }
401
402                 if (unlink(dest->buf) && errno != ENOENT)
403                         die_errno(_("failed to unlink '%s'"), dest->buf);
404                 if (!option_no_hardlinks) {
405                         if (!link(src->buf, dest->buf))
406                                 continue;
407                         if (option_local > 0)
408                                 die_errno(_("failed to create link '%s'"), dest->buf);
409                         option_no_hardlinks = 1;
410                 }
411                 if (copy_file_with_time(dest->buf, src->buf, 0666))
412                         die_errno(_("failed to copy file to '%s'"), dest->buf);
413         }
414         closedir(dir);
415 }
416
417 static void clone_local(const char *src_repo, const char *dest_repo)
418 {
419         if (option_shared) {
420                 struct strbuf alt = STRBUF_INIT;
421                 strbuf_addf(&alt, "%s/objects", src_repo);
422                 add_to_alternates_file(alt.buf);
423                 strbuf_release(&alt);
424         } else {
425                 struct strbuf src = STRBUF_INIT;
426                 struct strbuf dest = STRBUF_INIT;
427                 strbuf_addf(&src, "%s/objects", src_repo);
428                 strbuf_addf(&dest, "%s/objects", dest_repo);
429                 copy_or_link_directory(&src, &dest, src_repo, src.len);
430                 strbuf_release(&src);
431                 strbuf_release(&dest);
432         }
433
434         if (0 <= option_verbosity)
435                 fprintf(stderr, _("done.\n"));
436 }
437
438 static const char *junk_work_tree;
439 static const char *junk_git_dir;
440 static enum {
441         JUNK_LEAVE_NONE,
442         JUNK_LEAVE_REPO,
443         JUNK_LEAVE_ALL
444 } junk_mode = JUNK_LEAVE_NONE;
445
446 static const char junk_leave_repo_msg[] =
447 N_("Clone succeeded, but checkout failed.\n"
448    "You can inspect what was checked out with 'git status'\n"
449    "and retry the checkout with 'git checkout -f HEAD'\n");
450
451 static void remove_junk(void)
452 {
453         struct strbuf sb = STRBUF_INIT;
454
455         switch (junk_mode) {
456         case JUNK_LEAVE_REPO:
457                 warning("%s", _(junk_leave_repo_msg));
458                 /* fall-through */
459         case JUNK_LEAVE_ALL:
460                 return;
461         default:
462                 /* proceed to removal */
463                 break;
464         }
465
466         if (junk_git_dir) {
467                 strbuf_addstr(&sb, junk_git_dir);
468                 remove_dir_recursively(&sb, 0);
469                 strbuf_reset(&sb);
470         }
471         if (junk_work_tree) {
472                 strbuf_addstr(&sb, junk_work_tree);
473                 remove_dir_recursively(&sb, 0);
474                 strbuf_reset(&sb);
475         }
476 }
477
478 static void remove_junk_on_signal(int signo)
479 {
480         remove_junk();
481         sigchain_pop(signo);
482         raise(signo);
483 }
484
485 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
486 {
487         struct ref *ref;
488         struct strbuf head = STRBUF_INIT;
489         strbuf_addstr(&head, "refs/heads/");
490         strbuf_addstr(&head, branch);
491         ref = find_ref_by_name(refs, head.buf);
492         strbuf_release(&head);
493
494         if (ref)
495                 return ref;
496
497         strbuf_addstr(&head, "refs/tags/");
498         strbuf_addstr(&head, branch);
499         ref = find_ref_by_name(refs, head.buf);
500         strbuf_release(&head);
501
502         return ref;
503 }
504
505 static struct ref *wanted_peer_refs(const struct ref *refs,
506                 struct refspec *refspec)
507 {
508         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
509         struct ref *local_refs = head;
510         struct ref **tail = head ? &head->next : &local_refs;
511
512         if (option_single_branch) {
513                 struct ref *remote_head = NULL;
514
515                 if (!option_branch)
516                         remote_head = guess_remote_head(head, refs, 0);
517                 else {
518                         local_refs = NULL;
519                         tail = &local_refs;
520                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
521                 }
522
523                 if (!remote_head && option_branch)
524                         warning(_("Could not find remote branch %s to clone."),
525                                 option_branch);
526                 else {
527                         get_fetch_map(remote_head, refspec, &tail, 0);
528
529                         /* if --branch=tag, pull the requested tag explicitly */
530                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
531                 }
532         } else
533                 get_fetch_map(refs, refspec, &tail, 0);
534
535         if (!option_mirror && !option_single_branch)
536                 get_fetch_map(refs, tag_refspec, &tail, 0);
537
538         return local_refs;
539 }
540
541 static void write_remote_refs(const struct ref *local_refs)
542 {
543         const struct ref *r;
544
545         struct ref_transaction *t;
546         struct strbuf err = STRBUF_INIT;
547
548         t = ref_transaction_begin(&err);
549         if (!t)
550                 die("%s", err.buf);
551
552         for (r = local_refs; r; r = r->next) {
553                 if (!r->peer_ref)
554                         continue;
555                 if (ref_transaction_create(t, r->peer_ref->name, r->old_sha1,
556                                            0, NULL, &err))
557                         die("%s", err.buf);
558         }
559
560         if (initial_ref_transaction_commit(t, &err))
561                 die("%s", err.buf);
562
563         strbuf_release(&err);
564         ref_transaction_free(t);
565 }
566
567 static void write_followtags(const struct ref *refs, const char *msg)
568 {
569         const struct ref *ref;
570         for (ref = refs; ref; ref = ref->next) {
571                 if (!starts_with(ref->name, "refs/tags/"))
572                         continue;
573                 if (ends_with(ref->name, "^{}"))
574                         continue;
575                 if (!has_sha1_file(ref->old_sha1))
576                         continue;
577                 update_ref(msg, ref->name, ref->old_sha1,
578                            NULL, 0, UPDATE_REFS_DIE_ON_ERR);
579         }
580 }
581
582 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
583 {
584         struct ref **rm = cb_data;
585         struct ref *ref = *rm;
586
587         /*
588          * Skip anything missing a peer_ref, which we are not
589          * actually going to write a ref for.
590          */
591         while (ref && !ref->peer_ref)
592                 ref = ref->next;
593         /* Returning -1 notes "end of list" to the caller. */
594         if (!ref)
595                 return -1;
596
597         hashcpy(sha1, ref->old_sha1);
598         *rm = ref->next;
599         return 0;
600 }
601
602 static void update_remote_refs(const struct ref *refs,
603                                const struct ref *mapped_refs,
604                                const struct ref *remote_head_points_at,
605                                const char *branch_top,
606                                const char *msg,
607                                struct transport *transport,
608                                int check_connectivity)
609 {
610         const struct ref *rm = mapped_refs;
611
612         if (check_connectivity) {
613                 if (transport->progress)
614                         fprintf(stderr, _("Checking connectivity... "));
615                 if (check_everything_connected_with_transport(iterate_ref_map,
616                                                               0, &rm, transport))
617                         die(_("remote did not send all necessary objects"));
618                 if (transport->progress)
619                         fprintf(stderr, _("done.\n"));
620         }
621
622         if (refs) {
623                 write_remote_refs(mapped_refs);
624                 if (option_single_branch)
625                         write_followtags(refs, msg);
626         }
627
628         if (remote_head_points_at && !option_bare) {
629                 struct strbuf head_ref = STRBUF_INIT;
630                 strbuf_addstr(&head_ref, branch_top);
631                 strbuf_addstr(&head_ref, "HEAD");
632                 create_symref(head_ref.buf,
633                               remote_head_points_at->peer_ref->name,
634                               msg);
635         }
636 }
637
638 static void update_head(const struct ref *our, const struct ref *remote,
639                         const char *msg)
640 {
641         const char *head;
642         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
643                 /* Local default branch link */
644                 create_symref("HEAD", our->name, NULL);
645                 if (!option_bare) {
646                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0,
647                                    UPDATE_REFS_DIE_ON_ERR);
648                         install_branch_config(0, head, option_origin, our->name);
649                 }
650         } else if (our) {
651                 struct commit *c = lookup_commit_reference(our->old_sha1);
652                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
653                 update_ref(msg, "HEAD", c->object.sha1,
654                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
655         } else if (remote) {
656                 /*
657                  * We know remote HEAD points to a non-branch, or
658                  * HEAD points to a branch but we don't know which one.
659                  * Detach HEAD in all these cases.
660                  */
661                 update_ref(msg, "HEAD", remote->old_sha1,
662                            NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR);
663         }
664 }
665
666 static int checkout(void)
667 {
668         unsigned char sha1[20];
669         char *head;
670         struct lock_file *lock_file;
671         struct unpack_trees_options opts;
672         struct tree *tree;
673         struct tree_desc t;
674         int err = 0;
675
676         if (option_no_checkout)
677                 return 0;
678
679         head = resolve_refdup("HEAD", RESOLVE_REF_READING, sha1, NULL);
680         if (!head) {
681                 warning(_("remote HEAD refers to nonexistent ref, "
682                           "unable to checkout.\n"));
683                 return 0;
684         }
685         if (!strcmp(head, "HEAD")) {
686                 if (advice_detached_head)
687                         detach_advice(sha1_to_hex(sha1));
688         } else {
689                 if (!starts_with(head, "refs/heads/"))
690                         die(_("HEAD not found below refs/heads!"));
691         }
692         free(head);
693
694         /* We need to be in the new work tree for the checkout */
695         setup_work_tree();
696
697         lock_file = xcalloc(1, sizeof(struct lock_file));
698         hold_locked_index(lock_file, 1);
699
700         memset(&opts, 0, sizeof opts);
701         opts.update = 1;
702         opts.merge = 1;
703         opts.fn = oneway_merge;
704         opts.verbose_update = (option_verbosity >= 0);
705         opts.src_index = &the_index;
706         opts.dst_index = &the_index;
707
708         tree = parse_tree_indirect(sha1);
709         parse_tree(tree);
710         init_tree_desc(&t, tree->buffer, tree->size);
711         if (unpack_trees(1, &t, &opts) < 0)
712                 die(_("unable to checkout working tree"));
713
714         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
715                 die(_("unable to write new index file"));
716
717         err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1),
718                            sha1_to_hex(sha1), "1", NULL);
719
720         if (!err && option_recursive)
721                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
722
723         return err;
724 }
725
726 static int write_one_config(const char *key, const char *value, void *data)
727 {
728         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
729 }
730
731 static void write_config(struct string_list *config)
732 {
733         int i;
734
735         for (i = 0; i < config->nr; i++) {
736                 if (git_config_parse_parameter(config->items[i].string,
737                                                write_one_config, NULL) < 0)
738                         die("unable to write parameters to config file");
739         }
740 }
741
742 static void write_refspec_config(const char *src_ref_prefix,
743                 const struct ref *our_head_points_at,
744                 const struct ref *remote_head_points_at,
745                 struct strbuf *branch_top)
746 {
747         struct strbuf key = STRBUF_INIT;
748         struct strbuf value = STRBUF_INIT;
749
750         if (option_mirror || !option_bare) {
751                 if (option_single_branch && !option_mirror) {
752                         if (option_branch) {
753                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
754                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
755                                                 our_head_points_at->name);
756                                 else
757                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
758                                                 branch_top->buf, option_branch);
759                         } else if (remote_head_points_at) {
760                                 const char *head = remote_head_points_at->name;
761                                 if (!skip_prefix(head, "refs/heads/", &head))
762                                         die("BUG: remote HEAD points at non-head?");
763
764                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
765                                                 branch_top->buf, head);
766                         }
767                         /*
768                          * otherwise, the next "git fetch" will
769                          * simply fetch from HEAD without updating
770                          * any remote-tracking branch, which is what
771                          * we want.
772                          */
773                 } else {
774                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
775                 }
776                 /* Configure the remote */
777                 if (value.len) {
778                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
779                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
780                         strbuf_reset(&key);
781
782                         if (option_mirror) {
783                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
784                                 git_config_set(key.buf, "true");
785                                 strbuf_reset(&key);
786                         }
787                 }
788         }
789
790         strbuf_release(&key);
791         strbuf_release(&value);
792 }
793
794 static void dissociate_from_references(void)
795 {
796         static const char* argv[] = { "repack", "-a", "-d", NULL };
797
798         if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
799                 die(_("cannot repack to clean up"));
800         if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
801                 die_errno(_("cannot unlink temporary alternates file"));
802 }
803
804 int cmd_clone(int argc, const char **argv, const char *prefix)
805 {
806         int is_bundle = 0, is_local;
807         struct stat buf;
808         const char *repo_name, *repo, *work_tree, *git_dir;
809         char *path, *dir;
810         int dest_exists;
811         const struct ref *refs, *remote_head;
812         const struct ref *remote_head_points_at;
813         const struct ref *our_head_points_at;
814         struct ref *mapped_refs;
815         const struct ref *ref;
816         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
817         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
818         struct transport *transport = NULL;
819         const char *src_ref_prefix = "refs/heads/";
820         struct remote *remote;
821         int err = 0, complete_refs_before_fetch = 1;
822
823         struct refspec *refspec;
824         const char *fetch_pattern;
825
826         packet_trace_identity("clone");
827         argc = parse_options(argc, argv, prefix, builtin_clone_options,
828                              builtin_clone_usage, 0);
829
830         if (argc > 2)
831                 usage_msg_opt(_("Too many arguments."),
832                         builtin_clone_usage, builtin_clone_options);
833
834         if (argc == 0)
835                 usage_msg_opt(_("You must specify a repository to clone."),
836                         builtin_clone_usage, builtin_clone_options);
837
838         if (option_single_branch == -1)
839                 option_single_branch = option_depth ? 1 : 0;
840
841         if (option_mirror)
842                 option_bare = 1;
843
844         if (option_bare) {
845                 if (option_origin)
846                         die(_("--bare and --origin %s options are incompatible."),
847                             option_origin);
848                 if (real_git_dir)
849                         die(_("--bare and --separate-git-dir are incompatible."));
850                 option_no_checkout = 1;
851         }
852
853         if (!option_origin)
854                 option_origin = "origin";
855
856         repo_name = argv[0];
857
858         path = get_repo_path(repo_name, &is_bundle);
859         if (path)
860                 repo = xstrdup(absolute_path(repo_name));
861         else if (!strchr(repo_name, ':'))
862                 die(_("repository '%s' does not exist"), repo_name);
863         else
864                 repo = repo_name;
865
866         /* no need to be strict, transport_set_option() will validate it again */
867         if (option_depth && atoi(option_depth) < 1)
868                 die(_("depth %s is not a positive number"), option_depth);
869
870         if (argc == 2)
871                 dir = xstrdup(argv[1]);
872         else
873                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
874         strip_trailing_slashes(dir);
875
876         dest_exists = !stat(dir, &buf);
877         if (dest_exists && !is_empty_dir(dir))
878                 die(_("destination path '%s' already exists and is not "
879                         "an empty directory."), dir);
880
881         strbuf_addf(&reflog_msg, "clone: from %s", repo);
882
883         if (option_bare)
884                 work_tree = NULL;
885         else {
886                 work_tree = getenv("GIT_WORK_TREE");
887                 if (work_tree && !stat(work_tree, &buf))
888                         die(_("working tree '%s' already exists."), work_tree);
889         }
890
891         if (option_bare || work_tree)
892                 git_dir = xstrdup(dir);
893         else {
894                 work_tree = dir;
895                 git_dir = mkpathdup("%s/.git", dir);
896         }
897
898         atexit(remove_junk);
899         sigchain_push_common(remove_junk_on_signal);
900
901         if (!option_bare) {
902                 if (safe_create_leading_directories_const(work_tree) < 0)
903                         die_errno(_("could not create leading directories of '%s'"),
904                                   work_tree);
905                 if (!dest_exists && mkdir(work_tree, 0777))
906                         die_errno(_("could not create work tree dir '%s'"),
907                                   work_tree);
908                 junk_work_tree = work_tree;
909                 set_git_work_tree(work_tree);
910         }
911
912         junk_git_dir = git_dir;
913         if (safe_create_leading_directories_const(git_dir) < 0)
914                 die(_("could not create leading directories of '%s'"), git_dir);
915
916         set_git_dir_init(git_dir, real_git_dir, 0);
917         if (real_git_dir) {
918                 git_dir = real_git_dir;
919                 junk_git_dir = real_git_dir;
920         }
921
922         if (0 <= option_verbosity) {
923                 if (option_bare)
924                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
925                 else
926                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
927         }
928         init_db(option_template, INIT_DB_QUIET);
929         write_config(&option_config);
930
931         git_config(git_default_config, NULL);
932
933         if (option_bare) {
934                 if (option_mirror)
935                         src_ref_prefix = "refs/";
936                 strbuf_addstr(&branch_top, src_ref_prefix);
937
938                 git_config_set("core.bare", "true");
939         } else {
940                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
941         }
942
943         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
944         strbuf_addf(&key, "remote.%s.url", option_origin);
945         git_config_set(key.buf, repo);
946         strbuf_reset(&key);
947
948         if (option_reference.nr)
949                 setup_reference();
950         else if (option_dissociate) {
951                 warning(_("--dissociate given, but there is no --reference"));
952                 option_dissociate = 0;
953         }
954
955         fetch_pattern = value.buf;
956         refspec = parse_fetch_refspec(1, &fetch_pattern);
957
958         strbuf_reset(&value);
959
960         remote = remote_get(option_origin);
961         transport = transport_get(remote, remote->url[0]);
962         transport_set_verbosity(transport, option_verbosity, option_progress);
963
964         path = get_repo_path(remote->url[0], &is_bundle);
965         is_local = option_local != 0 && path && !is_bundle;
966         if (is_local) {
967                 if (option_depth)
968                         warning(_("--depth is ignored in local clones; use file:// instead."));
969                 if (!access(mkpath("%s/shallow", path), F_OK)) {
970                         if (option_local > 0)
971                                 warning(_("source repository is shallow, ignoring --local"));
972                         is_local = 0;
973                 }
974         }
975         if (option_local > 0 && !is_local)
976                 warning(_("--local is ignored"));
977         transport->cloning = 1;
978
979         if (!transport->get_refs_list || (!is_local && !transport->fetch))
980                 die(_("Don't know how to clone %s"), transport->url);
981
982         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
983
984         if (option_depth)
985                 transport_set_option(transport, TRANS_OPT_DEPTH,
986                                      option_depth);
987         if (option_single_branch)
988                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
989
990         if (option_upload_pack)
991                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
992                                      option_upload_pack);
993
994         if (transport->smart_options && !option_depth)
995                 transport->smart_options->check_self_contained_and_connected = 1;
996
997         refs = transport_get_remote_refs(transport);
998
999         if (refs) {
1000                 mapped_refs = wanted_peer_refs(refs, refspec);
1001                 /*
1002                  * transport_get_remote_refs() may return refs with null sha-1
1003                  * in mapped_refs (see struct transport->get_refs_list
1004                  * comment). In that case we need fetch it early because
1005                  * remote_head code below relies on it.
1006                  *
1007                  * for normal clones, transport_get_remote_refs() should
1008                  * return reliable ref set, we can delay cloning until after
1009                  * remote HEAD check.
1010                  */
1011                 for (ref = refs; ref; ref = ref->next)
1012                         if (is_null_sha1(ref->old_sha1)) {
1013                                 complete_refs_before_fetch = 0;
1014                                 break;
1015                         }
1016
1017                 if (!is_local && !complete_refs_before_fetch)
1018                         transport_fetch_refs(transport, mapped_refs);
1019
1020                 remote_head = find_ref_by_name(refs, "HEAD");
1021                 remote_head_points_at =
1022                         guess_remote_head(remote_head, mapped_refs, 0);
1023
1024                 if (option_branch) {
1025                         our_head_points_at =
1026                                 find_remote_branch(mapped_refs, option_branch);
1027
1028                         if (!our_head_points_at)
1029                                 die(_("Remote branch %s not found in upstream %s"),
1030                                     option_branch, option_origin);
1031                 }
1032                 else
1033                         our_head_points_at = remote_head_points_at;
1034         }
1035         else {
1036                 if (option_branch)
1037                         die(_("Remote branch %s not found in upstream %s"),
1038                                         option_branch, option_origin);
1039
1040                 warning(_("You appear to have cloned an empty repository."));
1041                 mapped_refs = NULL;
1042                 our_head_points_at = NULL;
1043                 remote_head_points_at = NULL;
1044                 remote_head = NULL;
1045                 option_no_checkout = 1;
1046                 if (!option_bare)
1047                         install_branch_config(0, "master", option_origin,
1048                                               "refs/heads/master");
1049         }
1050
1051         write_refspec_config(src_ref_prefix, our_head_points_at,
1052                         remote_head_points_at, &branch_top);
1053
1054         if (is_local)
1055                 clone_local(path, git_dir);
1056         else if (refs && complete_refs_before_fetch)
1057                 transport_fetch_refs(transport, mapped_refs);
1058
1059         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1060                            branch_top.buf, reflog_msg.buf, transport, !is_local);
1061
1062         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1063
1064         transport_unlock_pack(transport);
1065         transport_disconnect(transport);
1066
1067         if (option_dissociate) {
1068                 close_all_packs();
1069                 dissociate_from_references();
1070         }
1071
1072         junk_mode = JUNK_LEAVE_REPO;
1073         err = checkout();
1074
1075         strbuf_release(&reflog_msg);
1076         strbuf_release(&branch_top);
1077         strbuf_release(&key);
1078         strbuf_release(&value);
1079         junk_mode = JUNK_LEAVE_ALL;
1080
1081         free(refspec);
1082         return err;
1083 }