Merge branch 'jn/gitweb-search-utf-8'
[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 "parse-options.h"
13 #include "fetch-pack.h"
14 #include "refs.h"
15 #include "tree.h"
16 #include "tree-walk.h"
17 #include "unpack-trees.h"
18 #include "transport.h"
19 #include "strbuf.h"
20 #include "dir.h"
21 #include "pack-refs.h"
22 #include "sigchain.h"
23 #include "branch.h"
24 #include "remote.h"
25 #include "run-command.h"
26
27 /*
28  * Overall FIXMEs:
29  *  - respect DB_ENVIRONMENT for .git/objects.
30  *
31  * Implementation notes:
32  *  - dropping use-separate-remote and no-separate-remote compatibility
33  *
34  */
35 static const char * const builtin_clone_usage[] = {
36         "git clone [options] [--] <repo> [<dir>]",
37         NULL
38 };
39
40 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
41 static int option_local, option_no_hardlinks, option_shared, option_recursive;
42 static char *option_template, *option_depth;
43 static char *option_origin = NULL;
44 static char *option_branch = NULL;
45 static const char *real_git_dir;
46 static char *option_upload_pack = "git-upload-pack";
47 static int option_verbosity;
48 static int option_progress;
49 static struct string_list option_config;
50 static struct string_list option_reference;
51
52 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
53 {
54         struct string_list *option_reference = opt->value;
55         if (!arg)
56                 return -1;
57         string_list_append(option_reference, arg);
58         return 0;
59 }
60
61 static struct option builtin_clone_options[] = {
62         OPT__VERBOSITY(&option_verbosity),
63         OPT_BOOLEAN(0, "progress", &option_progress,
64                         "force progress reporting"),
65         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
66                     "don't create a checkout"),
67         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
68         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
69                 "create a bare repository",
70                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
71         OPT_BOOLEAN(0, "mirror", &option_mirror,
72                     "create a mirror repository (implies bare)"),
73         OPT_BOOLEAN('l', "local", &option_local,
74                     "to clone from a local repository"),
75         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
76                     "don't use local hardlinks, always copy"),
77         OPT_BOOLEAN('s', "shared", &option_shared,
78                     "setup as shared repository"),
79         OPT_BOOLEAN(0, "recursive", &option_recursive,
80                     "initialize submodules in the clone"),
81         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
82                     "initialize submodules in the clone"),
83         OPT_STRING(0, "template", &option_template, "template-directory",
84                    "directory from which templates will be used"),
85         OPT_CALLBACK(0 , "reference", &option_reference, "repo",
86                      "reference repository", &opt_parse_reference),
87         OPT_STRING('o', "origin", &option_origin, "name",
88                    "use <name> instead of 'origin' to track upstream"),
89         OPT_STRING('b', "branch", &option_branch, "branch",
90                    "checkout <branch> instead of the remote's HEAD"),
91         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
92                    "path to git-upload-pack on the remote"),
93         OPT_STRING(0, "depth", &option_depth, "depth",
94                     "create a shallow clone of that depth"),
95         OPT_BOOL(0, "single-branch", &option_single_branch,
96                     "clone only one branch, HEAD or --branch"),
97         OPT_STRING(0, "separate-git-dir", &real_git_dir, "gitdir",
98                    "separate git dir from working tree"),
99         OPT_STRING_LIST('c', "config", &option_config, "key=value",
100                         "set config inside the new repository"),
101         OPT_END()
102 };
103
104 static const char *argv_submodule[] = {
105         "submodule", "update", "--init", "--recursive", NULL
106 };
107
108 static char *get_repo_path(const char *repo, int *is_bundle)
109 {
110         static char *suffix[] = { "/.git", ".git", "" };
111         static char *bundle_suffix[] = { ".bundle", "" };
112         struct stat st;
113         int i;
114
115         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
116                 const char *path;
117                 path = mkpath("%s%s", repo, suffix[i]);
118                 if (stat(path, &st))
119                         continue;
120                 if (S_ISDIR(st.st_mode)) {
121                         *is_bundle = 0;
122                         return xstrdup(absolute_path(path));
123                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
124                         /* Is it a "gitfile"? */
125                         char signature[8];
126                         int len, fd = open(path, O_RDONLY);
127                         if (fd < 0)
128                                 continue;
129                         len = read_in_full(fd, signature, 8);
130                         close(fd);
131                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
132                                 continue;
133                         path = read_gitfile(path);
134                         if (path) {
135                                 *is_bundle = 0;
136                                 return xstrdup(absolute_path(path));
137                         }
138                 }
139         }
140
141         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
142                 const char *path;
143                 path = mkpath("%s%s", repo, bundle_suffix[i]);
144                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
145                         *is_bundle = 1;
146                         return xstrdup(absolute_path(path));
147                 }
148         }
149
150         return NULL;
151 }
152
153 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
154 {
155         const char *end = repo + strlen(repo), *start;
156         char *dir;
157
158         /*
159          * Strip trailing spaces, slashes and /.git
160          */
161         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
162                 end--;
163         if (end - repo > 5 && is_dir_sep(end[-5]) &&
164             !strncmp(end - 4, ".git", 4)) {
165                 end -= 5;
166                 while (repo < end && is_dir_sep(end[-1]))
167                         end--;
168         }
169
170         /*
171          * Find last component, but be prepared that repo could have
172          * the form  "remote.example.com:foo.git", i.e. no slash
173          * in the directory part.
174          */
175         start = end;
176         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
177                 start--;
178
179         /*
180          * Strip .{bundle,git}.
181          */
182         if (is_bundle) {
183                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
184                         end -= 7;
185         } else {
186                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
187                         end -= 4;
188         }
189
190         if (is_bare) {
191                 struct strbuf result = STRBUF_INIT;
192                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
193                 dir = strbuf_detach(&result, NULL);
194         } else
195                 dir = xstrndup(start, end - start);
196         /*
197          * Replace sequences of 'control' characters and whitespace
198          * with one ascii space, remove leading and trailing spaces.
199          */
200         if (*dir) {
201                 char *out = dir;
202                 int prev_space = 1 /* strip leading whitespace */;
203                 for (end = dir; *end; ++end) {
204                         char ch = *end;
205                         if ((unsigned char)ch < '\x20')
206                                 ch = '\x20';
207                         if (isspace(ch)) {
208                                 if (prev_space)
209                                         continue;
210                                 prev_space = 1;
211                         } else
212                                 prev_space = 0;
213                         *out++ = ch;
214                 }
215                 *out = '\0';
216                 if (out > dir && prev_space)
217                         out[-1] = '\0';
218         }
219         return dir;
220 }
221
222 static void strip_trailing_slashes(char *dir)
223 {
224         char *end = dir + strlen(dir);
225
226         while (dir < end - 1 && is_dir_sep(end[-1]))
227                 end--;
228         *end = '\0';
229 }
230
231 static int add_one_reference(struct string_list_item *item, void *cb_data)
232 {
233         char *ref_git;
234         struct strbuf alternate = STRBUF_INIT;
235         struct remote *remote;
236         struct transport *transport;
237         const struct ref *extra;
238
239         /* Beware: real_path() and mkpath() return static buffer */
240         ref_git = xstrdup(real_path(item->string));
241         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
242                 char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
243                 free(ref_git);
244                 ref_git = ref_git_git;
245         } else if (!is_directory(mkpath("%s/objects", ref_git)))
246                 die(_("reference repository '%s' is not a local directory."),
247                     item->string);
248
249         strbuf_addf(&alternate, "%s/objects", ref_git);
250         add_to_alternates_file(alternate.buf);
251         strbuf_release(&alternate);
252
253         remote = remote_get(ref_git);
254         transport = transport_get(remote, ref_git);
255         for (extra = transport_get_remote_refs(transport); extra;
256              extra = extra->next)
257                 add_extra_ref(extra->name, extra->old_sha1, 0);
258
259         transport_disconnect(transport);
260         free(ref_git);
261         return 0;
262 }
263
264 static void setup_reference(void)
265 {
266         for_each_string_list(&option_reference, add_one_reference, NULL);
267 }
268
269 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
270                             const char *src_repo)
271 {
272         /*
273          * Read from the source objects/info/alternates file
274          * and copy the entries to corresponding file in the
275          * destination repository with add_to_alternates_file().
276          * Both src and dst have "$path/objects/info/alternates".
277          *
278          * Instead of copying bit-for-bit from the original,
279          * we need to append to existing one so that the already
280          * created entry via "clone -s" is not lost, and also
281          * to turn entries with paths relative to the original
282          * absolute, so that they can be used in the new repository.
283          */
284         FILE *in = fopen(src->buf, "r");
285         struct strbuf line = STRBUF_INIT;
286
287         while (strbuf_getline(&line, in, '\n') != EOF) {
288                 char *abs_path, abs_buf[PATH_MAX];
289                 if (!line.len || line.buf[0] == '#')
290                         continue;
291                 if (is_absolute_path(line.buf)) {
292                         add_to_alternates_file(line.buf);
293                         continue;
294                 }
295                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
296                 normalize_path_copy(abs_buf, abs_path);
297                 add_to_alternates_file(abs_buf);
298         }
299         strbuf_release(&line);
300         fclose(in);
301 }
302
303 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
304                                    const char *src_repo, int src_baselen)
305 {
306         struct dirent *de;
307         struct stat buf;
308         int src_len, dest_len;
309         DIR *dir;
310
311         dir = opendir(src->buf);
312         if (!dir)
313                 die_errno(_("failed to open '%s'"), src->buf);
314
315         if (mkdir(dest->buf, 0777)) {
316                 if (errno != EEXIST)
317                         die_errno(_("failed to create directory '%s'"), dest->buf);
318                 else if (stat(dest->buf, &buf))
319                         die_errno(_("failed to stat '%s'"), dest->buf);
320                 else if (!S_ISDIR(buf.st_mode))
321                         die(_("%s exists and is not a directory"), dest->buf);
322         }
323
324         strbuf_addch(src, '/');
325         src_len = src->len;
326         strbuf_addch(dest, '/');
327         dest_len = dest->len;
328
329         while ((de = readdir(dir)) != NULL) {
330                 strbuf_setlen(src, src_len);
331                 strbuf_addstr(src, de->d_name);
332                 strbuf_setlen(dest, dest_len);
333                 strbuf_addstr(dest, de->d_name);
334                 if (stat(src->buf, &buf)) {
335                         warning (_("failed to stat %s\n"), src->buf);
336                         continue;
337                 }
338                 if (S_ISDIR(buf.st_mode)) {
339                         if (de->d_name[0] != '.')
340                                 copy_or_link_directory(src, dest,
341                                                        src_repo, src_baselen);
342                         continue;
343                 }
344
345                 /* Files that cannot be copied bit-for-bit... */
346                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
347                         copy_alternates(src, dest, src_repo);
348                         continue;
349                 }
350
351                 if (unlink(dest->buf) && errno != ENOENT)
352                         die_errno(_("failed to unlink '%s'"), dest->buf);
353                 if (!option_no_hardlinks) {
354                         if (!link(src->buf, dest->buf))
355                                 continue;
356                         if (option_local)
357                                 die_errno(_("failed to create link '%s'"), dest->buf);
358                         option_no_hardlinks = 1;
359                 }
360                 if (copy_file_with_time(dest->buf, src->buf, 0666))
361                         die_errno(_("failed to copy file to '%s'"), dest->buf);
362         }
363         closedir(dir);
364 }
365
366 static void clone_local(const char *src_repo, const char *dest_repo)
367 {
368         if (option_shared) {
369                 struct strbuf alt = STRBUF_INIT;
370                 strbuf_addf(&alt, "%s/objects", src_repo);
371                 add_to_alternates_file(alt.buf);
372                 strbuf_release(&alt);
373         } else {
374                 struct strbuf src = STRBUF_INIT;
375                 struct strbuf dest = STRBUF_INIT;
376                 strbuf_addf(&src, "%s/objects", src_repo);
377                 strbuf_addf(&dest, "%s/objects", dest_repo);
378                 copy_or_link_directory(&src, &dest, src_repo, src.len);
379                 strbuf_release(&src);
380                 strbuf_release(&dest);
381         }
382
383         if (0 <= option_verbosity)
384                 printf(_("done.\n"));
385 }
386
387 static const char *junk_work_tree;
388 static const char *junk_git_dir;
389 static pid_t junk_pid;
390
391 static void remove_junk(void)
392 {
393         struct strbuf sb = STRBUF_INIT;
394         if (getpid() != junk_pid)
395                 return;
396         if (junk_git_dir) {
397                 strbuf_addstr(&sb, junk_git_dir);
398                 remove_dir_recursively(&sb, 0);
399                 strbuf_reset(&sb);
400         }
401         if (junk_work_tree) {
402                 strbuf_addstr(&sb, junk_work_tree);
403                 remove_dir_recursively(&sb, 0);
404                 strbuf_reset(&sb);
405         }
406 }
407
408 static void remove_junk_on_signal(int signo)
409 {
410         remove_junk();
411         sigchain_pop(signo);
412         raise(signo);
413 }
414
415 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
416 {
417         struct ref *ref;
418         struct strbuf head = STRBUF_INIT;
419         strbuf_addstr(&head, "refs/heads/");
420         strbuf_addstr(&head, branch);
421         ref = find_ref_by_name(refs, head.buf);
422         strbuf_release(&head);
423
424         if (ref)
425                 return ref;
426
427         strbuf_addstr(&head, "refs/tags/");
428         strbuf_addstr(&head, branch);
429         ref = find_ref_by_name(refs, head.buf);
430         strbuf_release(&head);
431
432         return ref;
433 }
434
435 static struct ref *wanted_peer_refs(const struct ref *refs,
436                 struct refspec *refspec)
437 {
438         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
439         struct ref *local_refs = head;
440         struct ref **tail = head ? &head->next : &local_refs;
441
442         if (option_single_branch) {
443                 struct ref *remote_head = NULL;
444
445                 if (!option_branch)
446                         remote_head = guess_remote_head(head, refs, 0);
447                 else
448                         remote_head = find_remote_branch(refs, option_branch);
449
450                 if (!remote_head && option_branch)
451                         warning(_("Could not find remote branch %s to clone."),
452                                 option_branch);
453                 else {
454                         get_fetch_map(remote_head, refspec, &tail, 0);
455
456                         /* if --branch=tag, pull the requested tag explicitly */
457                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
458                 }
459         } else
460                 get_fetch_map(refs, refspec, &tail, 0);
461
462         if (!option_mirror && !option_single_branch)
463                 get_fetch_map(refs, tag_refspec, &tail, 0);
464
465         return local_refs;
466 }
467
468 static void write_remote_refs(const struct ref *local_refs)
469 {
470         const struct ref *r;
471
472         for (r = local_refs; r; r = r->next) {
473                 if (!r->peer_ref)
474                         continue;
475                 add_packed_ref(r->peer_ref->name, r->old_sha1);
476         }
477
478         pack_refs(PACK_REFS_ALL);
479 }
480
481 static void write_followtags(const struct ref *refs, const char *msg)
482 {
483         const struct ref *ref;
484         for (ref = refs; ref; ref = ref->next) {
485                 if (prefixcmp(ref->name, "refs/tags/"))
486                         continue;
487                 if (!suffixcmp(ref->name, "^{}"))
488                         continue;
489                 if (!has_sha1_file(ref->old_sha1))
490                         continue;
491                 update_ref(msg, ref->name, ref->old_sha1,
492                            NULL, 0, DIE_ON_ERR);
493         }
494 }
495
496 static void update_remote_refs(const struct ref *refs,
497                                const struct ref *mapped_refs,
498                                const struct ref *remote_head_points_at,
499                                const char *branch_top,
500                                const char *msg)
501 {
502         if (refs) {
503                 clear_extra_refs();
504                 write_remote_refs(mapped_refs);
505                 if (option_single_branch)
506                         write_followtags(refs, msg);
507         }
508
509         if (remote_head_points_at && !option_bare) {
510                 struct strbuf head_ref = STRBUF_INIT;
511                 strbuf_addstr(&head_ref, branch_top);
512                 strbuf_addstr(&head_ref, "HEAD");
513                 create_symref(head_ref.buf,
514                               remote_head_points_at->peer_ref->name,
515                               msg);
516         }
517 }
518
519 static void update_head(const struct ref *our, const struct ref *remote,
520                         const char *msg)
521 {
522         if (our && !prefixcmp(our->name, "refs/heads/")) {
523                 /* Local default branch link */
524                 create_symref("HEAD", our->name, NULL);
525                 if (!option_bare) {
526                         const char *head = skip_prefix(our->name, "refs/heads/");
527                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
528                         install_branch_config(0, head, option_origin, our->name);
529                 }
530         } else if (our) {
531                 struct commit *c = lookup_commit_reference(our->old_sha1);
532                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
533                 update_ref(msg, "HEAD", c->object.sha1,
534                            NULL, REF_NODEREF, DIE_ON_ERR);
535         } else if (remote) {
536                 /*
537                  * We know remote HEAD points to a non-branch, or
538                  * HEAD points to a branch but we don't know which one.
539                  * Detach HEAD in all these cases.
540                  */
541                 update_ref(msg, "HEAD", remote->old_sha1,
542                            NULL, REF_NODEREF, DIE_ON_ERR);
543         }
544 }
545
546 static int checkout(void)
547 {
548         unsigned char sha1[20];
549         char *head;
550         struct lock_file *lock_file;
551         struct unpack_trees_options opts;
552         struct tree *tree;
553         struct tree_desc t;
554         int err = 0, fd;
555
556         if (option_no_checkout)
557                 return 0;
558
559         head = resolve_refdup("HEAD", sha1, 1, NULL);
560         if (!head) {
561                 warning(_("remote HEAD refers to nonexistent ref, "
562                           "unable to checkout.\n"));
563                 return 0;
564         }
565         if (!strcmp(head, "HEAD")) {
566                 if (advice_detached_head)
567                         detach_advice(sha1_to_hex(sha1));
568         } else {
569                 if (prefixcmp(head, "refs/heads/"))
570                         die(_("HEAD not found below refs/heads!"));
571         }
572         free(head);
573
574         /* We need to be in the new work tree for the checkout */
575         setup_work_tree();
576
577         lock_file = xcalloc(1, sizeof(struct lock_file));
578         fd = hold_locked_index(lock_file, 1);
579
580         memset(&opts, 0, sizeof opts);
581         opts.update = 1;
582         opts.merge = 1;
583         opts.fn = oneway_merge;
584         opts.verbose_update = (option_verbosity > 0);
585         opts.src_index = &the_index;
586         opts.dst_index = &the_index;
587
588         tree = parse_tree_indirect(sha1);
589         parse_tree(tree);
590         init_tree_desc(&t, tree->buffer, tree->size);
591         unpack_trees(1, &t, &opts);
592
593         if (write_cache(fd, active_cache, active_nr) ||
594             commit_locked_index(lock_file))
595                 die(_("unable to write new index file"));
596
597         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
598                         sha1_to_hex(sha1), "1", NULL);
599
600         if (!err && option_recursive)
601                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
602
603         return err;
604 }
605
606 static int write_one_config(const char *key, const char *value, void *data)
607 {
608         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
609 }
610
611 static void write_config(struct string_list *config)
612 {
613         int i;
614
615         for (i = 0; i < config->nr; i++) {
616                 if (git_config_parse_parameter(config->items[i].string,
617                                                write_one_config, NULL) < 0)
618                         die("unable to write parameters to config file");
619         }
620 }
621
622 int cmd_clone(int argc, const char **argv, const char *prefix)
623 {
624         int is_bundle = 0, is_local;
625         struct stat buf;
626         const char *repo_name, *repo, *work_tree, *git_dir;
627         char *path, *dir;
628         int dest_exists;
629         const struct ref *refs, *remote_head;
630         const struct ref *remote_head_points_at;
631         const struct ref *our_head_points_at;
632         struct ref *mapped_refs;
633         const struct ref *ref;
634         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
635         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
636         struct transport *transport = NULL;
637         const char *src_ref_prefix = "refs/heads/";
638         struct remote *remote;
639         int err = 0, complete_refs_before_fetch = 1;
640
641         struct refspec *refspec;
642         const char *fetch_pattern;
643
644         junk_pid = getpid();
645
646         packet_trace_identity("clone");
647         argc = parse_options(argc, argv, prefix, builtin_clone_options,
648                              builtin_clone_usage, 0);
649
650         if (argc > 2)
651                 usage_msg_opt(_("Too many arguments."),
652                         builtin_clone_usage, builtin_clone_options);
653
654         if (argc == 0)
655                 usage_msg_opt(_("You must specify a repository to clone."),
656                         builtin_clone_usage, builtin_clone_options);
657
658         if (option_single_branch == -1)
659                 option_single_branch = option_depth ? 1 : 0;
660
661         if (option_mirror)
662                 option_bare = 1;
663
664         if (option_bare) {
665                 if (option_origin)
666                         die(_("--bare and --origin %s options are incompatible."),
667                             option_origin);
668                 option_no_checkout = 1;
669         }
670
671         if (!option_origin)
672                 option_origin = "origin";
673
674         repo_name = argv[0];
675
676         path = get_repo_path(repo_name, &is_bundle);
677         if (path)
678                 repo = xstrdup(absolute_path(repo_name));
679         else if (!strchr(repo_name, ':'))
680                 die(_("repository '%s' does not exist"), repo_name);
681         else
682                 repo = repo_name;
683         is_local = path && !is_bundle;
684         if (is_local && option_depth)
685                 warning(_("--depth is ignored in local clones; use file:// instead."));
686
687         if (argc == 2)
688                 dir = xstrdup(argv[1]);
689         else
690                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
691         strip_trailing_slashes(dir);
692
693         dest_exists = !stat(dir, &buf);
694         if (dest_exists && !is_empty_dir(dir))
695                 die(_("destination path '%s' already exists and is not "
696                         "an empty directory."), dir);
697
698         strbuf_addf(&reflog_msg, "clone: from %s", repo);
699
700         if (option_bare)
701                 work_tree = NULL;
702         else {
703                 work_tree = getenv("GIT_WORK_TREE");
704                 if (work_tree && !stat(work_tree, &buf))
705                         die(_("working tree '%s' already exists."), work_tree);
706         }
707
708         if (option_bare || work_tree)
709                 git_dir = xstrdup(dir);
710         else {
711                 work_tree = dir;
712                 git_dir = xstrdup(mkpath("%s/.git", dir));
713         }
714
715         if (!option_bare) {
716                 junk_work_tree = work_tree;
717                 if (safe_create_leading_directories_const(work_tree) < 0)
718                         die_errno(_("could not create leading directories of '%s'"),
719                                   work_tree);
720                 if (!dest_exists && mkdir(work_tree, 0755))
721                         die_errno(_("could not create work tree dir '%s'."),
722                                   work_tree);
723                 set_git_work_tree(work_tree);
724         }
725         junk_git_dir = git_dir;
726         atexit(remove_junk);
727         sigchain_push_common(remove_junk_on_signal);
728
729         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
730
731         if (safe_create_leading_directories_const(git_dir) < 0)
732                 die(_("could not create leading directories of '%s'"), git_dir);
733
734         set_git_dir_init(git_dir, real_git_dir, 0);
735         if (real_git_dir)
736                 git_dir = real_git_dir;
737
738         if (0 <= option_verbosity) {
739                 if (option_bare)
740                         printf(_("Cloning into bare repository '%s'...\n"), dir);
741                 else
742                         printf(_("Cloning into '%s'...\n"), dir);
743         }
744         init_db(option_template, INIT_DB_QUIET);
745         write_config(&option_config);
746
747         /*
748          * At this point, the config exists, so we do not need the
749          * environment variable.  We actually need to unset it, too, to
750          * re-enable parsing of the global configs.
751          */
752         unsetenv(CONFIG_ENVIRONMENT);
753
754         git_config(git_default_config, NULL);
755
756         if (option_bare) {
757                 if (option_mirror)
758                         src_ref_prefix = "refs/";
759                 strbuf_addstr(&branch_top, src_ref_prefix);
760
761                 git_config_set("core.bare", "true");
762         } else {
763                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
764         }
765
766         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
767
768         if (option_mirror || !option_bare) {
769                 /* Configure the remote */
770                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
771                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
772                 strbuf_reset(&key);
773
774                 if (option_mirror) {
775                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
776                         git_config_set(key.buf, "true");
777                         strbuf_reset(&key);
778                 }
779         }
780
781         strbuf_addf(&key, "remote.%s.url", option_origin);
782         git_config_set(key.buf, repo);
783         strbuf_reset(&key);
784
785         if (option_reference.nr)
786                 setup_reference();
787
788         fetch_pattern = value.buf;
789         refspec = parse_fetch_refspec(1, &fetch_pattern);
790
791         strbuf_reset(&value);
792
793         remote = remote_get(option_origin);
794         transport = transport_get(remote, remote->url[0]);
795
796         if (!is_local) {
797                 if (!transport->get_refs_list || !transport->fetch)
798                         die(_("Don't know how to clone %s"), transport->url);
799
800                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
801
802                 if (option_depth)
803                         transport_set_option(transport, TRANS_OPT_DEPTH,
804                                              option_depth);
805                 if (option_single_branch)
806                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
807
808                 transport_set_verbosity(transport, option_verbosity, option_progress);
809
810                 if (option_upload_pack)
811                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
812                                              option_upload_pack);
813         }
814
815         refs = transport_get_remote_refs(transport);
816         mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
817
818         /*
819          * transport_get_remote_refs() may return refs with null sha-1
820          * in mapped_refs (see struct transport->get_refs_list
821          * comment). In that case we need fetch it early because
822          * remote_head code below relies on it.
823          *
824          * for normal clones, transport_get_remote_refs() should
825          * return reliable ref set, we can delay cloning until after
826          * remote HEAD check.
827          */
828         for (ref = refs; ref; ref = ref->next)
829                 if (is_null_sha1(ref->old_sha1)) {
830                         complete_refs_before_fetch = 0;
831                         break;
832                 }
833
834         if (!is_local && !complete_refs_before_fetch && refs)
835                 transport_fetch_refs(transport, mapped_refs);
836
837         if (refs) {
838                 remote_head = find_ref_by_name(refs, "HEAD");
839                 remote_head_points_at =
840                         guess_remote_head(remote_head, mapped_refs, 0);
841
842                 if (option_branch) {
843                         our_head_points_at =
844                                 find_remote_branch(mapped_refs, option_branch);
845
846                         if (!our_head_points_at)
847                                 die(_("Remote branch %s not found in upstream %s"),
848                                     option_branch, option_origin);
849                 }
850                 else
851                         our_head_points_at = remote_head_points_at;
852         }
853         else {
854                 warning(_("You appear to have cloned an empty repository."));
855                 our_head_points_at = NULL;
856                 remote_head_points_at = NULL;
857                 remote_head = NULL;
858                 option_no_checkout = 1;
859                 if (!option_bare)
860                         install_branch_config(0, "master", option_origin,
861                                               "refs/heads/master");
862         }
863
864         if (is_local)
865                 clone_local(path, git_dir);
866         else if (refs && complete_refs_before_fetch)
867                 transport_fetch_refs(transport, mapped_refs);
868
869         update_remote_refs(refs, mapped_refs, remote_head_points_at,
870                            branch_top.buf, reflog_msg.buf);
871
872         update_head(our_head_points_at, remote_head, reflog_msg.buf);
873
874         transport_unlock_pack(transport);
875         transport_disconnect(transport);
876
877         err = checkout();
878
879         strbuf_release(&reflog_msg);
880         strbuf_release(&branch_top);
881         strbuf_release(&key);
882         strbuf_release(&value);
883         junk_pid = 0;
884         return err;
885 }