grep: fix worktree setup
[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 "cache.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
23 /*
24  * Overall FIXMEs:
25  *  - respect DB_ENVIRONMENT for .git/objects.
26  *
27  * Implementation notes:
28  *  - dropping use-separate-remote and no-separate-remote compatibility
29  *
30  */
31 static const char * const builtin_clone_usage[] = {
32         "git clone [options] [--] <repo> [<dir>]",
33         NULL
34 };
35
36 static int option_quiet, option_no_checkout, option_bare, option_mirror;
37 static int option_local, option_no_hardlinks, option_shared;
38 static char *option_template, *option_reference, *option_depth;
39 static char *option_origin = NULL;
40 static char *option_upload_pack = "git-upload-pack";
41
42 static struct option builtin_clone_options[] = {
43         OPT__QUIET(&option_quiet),
44         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
45                     "don't create a checkout"),
46         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
47         OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
48         OPT_BOOLEAN(0, "mirror", &option_mirror,
49                     "create a mirror repository (implies bare)"),
50         OPT_BOOLEAN('l', "local", &option_local,
51                     "to clone from a local repository"),
52         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
53                     "don't use local hardlinks, always copy"),
54         OPT_BOOLEAN('s', "shared", &option_shared,
55                     "setup as shared repository"),
56         OPT_STRING(0, "template", &option_template, "path",
57                    "path the template repository"),
58         OPT_STRING(0, "reference", &option_reference, "repo",
59                    "reference repository"),
60         OPT_STRING('o', "origin", &option_origin, "branch",
61                    "use <branch> instead or 'origin' to track upstream"),
62         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
63                    "path to git-upload-pack on the remote"),
64         OPT_STRING(0, "depth", &option_depth, "depth",
65                     "create a shallow clone of that depth"),
66
67         OPT_END()
68 };
69
70 static char *get_repo_path(const char *repo, int *is_bundle)
71 {
72         static char *suffix[] = { "/.git", ".git", "" };
73         static char *bundle_suffix[] = { ".bundle", "" };
74         struct stat st;
75         int i;
76
77         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
78                 const char *path;
79                 path = mkpath("%s%s", repo, suffix[i]);
80                 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
81                         *is_bundle = 0;
82                         return xstrdup(make_nonrelative_path(path));
83                 }
84         }
85
86         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
87                 const char *path;
88                 path = mkpath("%s%s", repo, bundle_suffix[i]);
89                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
90                         *is_bundle = 1;
91                         return xstrdup(make_nonrelative_path(path));
92                 }
93         }
94
95         return NULL;
96 }
97
98 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
99 {
100         const char *end = repo + strlen(repo), *start;
101
102         /*
103          * Strip trailing slashes and /.git
104          */
105         while (repo < end && is_dir_sep(end[-1]))
106                 end--;
107         if (end - repo > 5 && is_dir_sep(end[-5]) &&
108             !strncmp(end - 4, ".git", 4)) {
109                 end -= 5;
110                 while (repo < end && is_dir_sep(end[-1]))
111                         end--;
112         }
113
114         /*
115          * Find last component, but be prepared that repo could have
116          * the form  "remote.example.com:foo.git", i.e. no slash
117          * in the directory part.
118          */
119         start = end;
120         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
121                 start--;
122
123         /*
124          * Strip .{bundle,git}.
125          */
126         if (is_bundle) {
127                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
128                         end -= 7;
129         } else {
130                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
131                         end -= 4;
132         }
133
134         if (is_bare) {
135                 char *result = xmalloc(end - start + 5);
136                 sprintf(result, "%.*s.git", (int)(end - start), start);
137                 return result;
138         }
139
140         return xstrndup(start, end - start);
141 }
142
143 static int is_directory(const char *path)
144 {
145         struct stat buf;
146
147         return !stat(path, &buf) && S_ISDIR(buf.st_mode);
148 }
149
150 static void setup_reference(const char *repo)
151 {
152         const char *ref_git;
153         char *ref_git_copy;
154
155         struct remote *remote;
156         struct transport *transport;
157         const struct ref *extra;
158
159         ref_git = make_absolute_path(option_reference);
160
161         if (is_directory(mkpath("%s/.git/objects", ref_git)))
162                 ref_git = mkpath("%s/.git", ref_git);
163         else if (!is_directory(mkpath("%s/objects", ref_git)))
164                 die("reference repository '%s' is not a local directory.",
165                     option_reference);
166
167         ref_git_copy = xstrdup(ref_git);
168
169         add_to_alternates_file(ref_git_copy);
170
171         remote = remote_get(ref_git_copy);
172         transport = transport_get(remote, ref_git_copy);
173         for (extra = transport_get_remote_refs(transport); extra;
174              extra = extra->next)
175                 add_extra_ref(extra->name, extra->old_sha1, 0);
176
177         transport_disconnect(transport);
178
179         free(ref_git_copy);
180 }
181
182 static void copy_or_link_directory(char *src, char *dest)
183 {
184         struct dirent *de;
185         struct stat buf;
186         int src_len, dest_len;
187         DIR *dir;
188
189         dir = opendir(src);
190         if (!dir)
191                 die("failed to open %s\n", src);
192
193         if (mkdir(dest, 0777)) {
194                 if (errno != EEXIST)
195                         die("failed to create directory %s\n", dest);
196                 else if (stat(dest, &buf))
197                         die("failed to stat %s\n", dest);
198                 else if (!S_ISDIR(buf.st_mode))
199                         die("%s exists and is not a directory\n", dest);
200         }
201
202         src_len = strlen(src);
203         src[src_len] = '/';
204         dest_len = strlen(dest);
205         dest[dest_len] = '/';
206
207         while ((de = readdir(dir)) != NULL) {
208                 strcpy(src + src_len + 1, de->d_name);
209                 strcpy(dest + dest_len + 1, de->d_name);
210                 if (stat(src, &buf)) {
211                         warning ("failed to stat %s\n", src);
212                         continue;
213                 }
214                 if (S_ISDIR(buf.st_mode)) {
215                         if (de->d_name[0] != '.')
216                                 copy_or_link_directory(src, dest);
217                         continue;
218                 }
219
220                 if (unlink(dest) && errno != ENOENT)
221                         die("failed to unlink %s\n", dest);
222                 if (!option_no_hardlinks) {
223                         if (!link(src, dest))
224                                 continue;
225                         if (option_local)
226                                 die("failed to create link %s\n", dest);
227                         option_no_hardlinks = 1;
228                 }
229                 if (copy_file(dest, src, 0666))
230                         die("failed to copy file to %s\n", dest);
231         }
232         closedir(dir);
233 }
234
235 static const struct ref *clone_local(const char *src_repo,
236                                      const char *dest_repo)
237 {
238         const struct ref *ret;
239         char src[PATH_MAX];
240         char dest[PATH_MAX];
241         struct remote *remote;
242         struct transport *transport;
243
244         if (option_shared)
245                 add_to_alternates_file(src_repo);
246         else {
247                 snprintf(src, PATH_MAX, "%s/objects", src_repo);
248                 snprintf(dest, PATH_MAX, "%s/objects", dest_repo);
249                 copy_or_link_directory(src, dest);
250         }
251
252         remote = remote_get(src_repo);
253         transport = transport_get(remote, src_repo);
254         ret = transport_get_remote_refs(transport);
255         transport_disconnect(transport);
256         return ret;
257 }
258
259 static const char *junk_work_tree;
260 static const char *junk_git_dir;
261 pid_t junk_pid;
262
263 static void remove_junk(void)
264 {
265         struct strbuf sb;
266         if (getpid() != junk_pid)
267                 return;
268         strbuf_init(&sb, 0);
269         if (junk_git_dir) {
270                 strbuf_addstr(&sb, junk_git_dir);
271                 remove_dir_recursively(&sb, 0);
272                 strbuf_reset(&sb);
273         }
274         if (junk_work_tree) {
275                 strbuf_addstr(&sb, junk_work_tree);
276                 remove_dir_recursively(&sb, 0);
277                 strbuf_reset(&sb);
278         }
279 }
280
281 static void remove_junk_on_signal(int signo)
282 {
283         remove_junk();
284         signal(SIGINT, SIG_DFL);
285         raise(signo);
286 }
287
288 static const struct ref *locate_head(const struct ref *refs,
289                                      const struct ref *mapped_refs,
290                                      const struct ref **remote_head_p)
291 {
292         const struct ref *remote_head = NULL;
293         const struct ref *remote_master = NULL;
294         const struct ref *r;
295         for (r = refs; r; r = r->next)
296                 if (!strcmp(r->name, "HEAD"))
297                         remote_head = r;
298
299         for (r = mapped_refs; r; r = r->next)
300                 if (!strcmp(r->name, "refs/heads/master"))
301                         remote_master = r;
302
303         if (remote_head_p)
304                 *remote_head_p = remote_head;
305
306         /* If there's no HEAD value at all, never mind. */
307         if (!remote_head)
308                 return NULL;
309
310         /* If refs/heads/master could be right, it is. */
311         if (remote_master && !hashcmp(remote_master->old_sha1,
312                                       remote_head->old_sha1))
313                 return remote_master;
314
315         /* Look for another ref that points there */
316         for (r = mapped_refs; r; r = r->next)
317                 if (r != remote_head &&
318                     !hashcmp(r->old_sha1, remote_head->old_sha1))
319                         return r;
320
321         /* Nothing is the same */
322         return NULL;
323 }
324
325 static struct ref *write_remote_refs(const struct ref *refs,
326                 struct refspec *refspec, const char *reflog)
327 {
328         struct ref *local_refs = NULL;
329         struct ref **tail = &local_refs;
330         struct ref *r;
331
332         get_fetch_map(refs, refspec, &tail, 0);
333         if (!option_mirror)
334                 get_fetch_map(refs, tag_refspec, &tail, 0);
335
336         for (r = local_refs; r; r = r->next)
337                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
338
339         pack_refs(PACK_REFS_ALL);
340         clear_extra_refs();
341
342         return local_refs;
343 }
344
345 int cmd_clone(int argc, const char **argv, const char *prefix)
346 {
347         int use_local_hardlinks = 1;
348         int use_separate_remote = 1;
349         int is_bundle = 0;
350         struct stat buf;
351         const char *repo_name, *repo, *work_tree, *git_dir;
352         char *path, *dir;
353         const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
354         char branch_top[256], key[256], value[256];
355         struct strbuf reflog_msg;
356         struct transport *transport = NULL;
357         char *src_ref_prefix = "refs/heads/";
358
359         struct refspec refspec;
360
361         junk_pid = getpid();
362
363         argc = parse_options(argc, argv, builtin_clone_options,
364                              builtin_clone_usage, 0);
365
366         if (argc == 0)
367                 die("You must specify a repository to clone.");
368
369         if (option_no_hardlinks)
370                 use_local_hardlinks = 0;
371
372         if (option_mirror)
373                 option_bare = 1;
374
375         if (option_bare) {
376                 if (option_origin)
377                         die("--bare and --origin %s options are incompatible.",
378                             option_origin);
379                 option_no_checkout = 1;
380                 use_separate_remote = 0;
381         }
382
383         if (!option_origin)
384                 option_origin = "origin";
385
386         repo_name = argv[0];
387
388         path = get_repo_path(repo_name, &is_bundle);
389         if (path)
390                 repo = path;
391         else if (!strchr(repo_name, ':'))
392                 repo = xstrdup(make_absolute_path(repo_name));
393         else
394                 repo = repo_name;
395
396         if (argc == 2)
397                 dir = xstrdup(argv[1]);
398         else
399                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
400
401         if (!stat(dir, &buf))
402                 die("destination directory '%s' already exists.", dir);
403
404         strbuf_init(&reflog_msg, 0);
405         strbuf_addf(&reflog_msg, "clone: from %s", repo);
406
407         if (option_bare)
408                 work_tree = NULL;
409         else {
410                 work_tree = getenv("GIT_WORK_TREE");
411                 if (work_tree && !stat(work_tree, &buf))
412                         die("working tree '%s' already exists.", work_tree);
413         }
414
415         if (option_bare || work_tree)
416                 git_dir = xstrdup(dir);
417         else {
418                 work_tree = dir;
419                 git_dir = xstrdup(mkpath("%s/.git", dir));
420         }
421
422         if (!option_bare) {
423                 junk_work_tree = work_tree;
424                 if (safe_create_leading_directories_const(work_tree) < 0)
425                         die("could not create leading directories of '%s'",
426                                         work_tree);
427                 if (mkdir(work_tree, 0755))
428                         die("could not create work tree dir '%s'.", work_tree);
429                 set_git_work_tree(work_tree);
430         }
431         junk_git_dir = git_dir;
432         atexit(remove_junk);
433         signal(SIGINT, remove_junk_on_signal);
434
435         setenv(CONFIG_ENVIRONMENT, xstrdup(mkpath("%s/config", git_dir)), 1);
436
437         if (safe_create_leading_directories_const(git_dir) < 0)
438                 die("could not create leading directories of '%s'", git_dir);
439         set_git_dir(make_absolute_path(git_dir));
440
441         init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
442
443         /*
444          * At this point, the config exists, so we do not need the
445          * environment variable.  We actually need to unset it, too, to
446          * re-enable parsing of the global configs.
447          */
448         unsetenv(CONFIG_ENVIRONMENT);
449
450         if (option_reference)
451                 setup_reference(git_dir);
452
453         git_config(git_default_config, NULL);
454
455         if (option_bare) {
456                 if (option_mirror)
457                         src_ref_prefix = "refs/";
458                 strcpy(branch_top, src_ref_prefix);
459
460                 git_config_set("core.bare", "true");
461         } else {
462                 snprintf(branch_top, sizeof(branch_top),
463                          "refs/remotes/%s/", option_origin);
464         }
465
466         if (option_mirror || !option_bare) {
467                 /* Configure the remote */
468                 if (option_mirror) {
469                         snprintf(key, sizeof(key),
470                                         "remote.%s.mirror", option_origin);
471                         git_config_set(key, "true");
472                 }
473
474                 snprintf(key, sizeof(key), "remote.%s.url", option_origin);
475                 git_config_set(key, repo);
476
477                 snprintf(key, sizeof(key), "remote.%s.fetch", option_origin);
478                 snprintf(value, sizeof(value),
479                                 "+%s*:%s*", src_ref_prefix, branch_top);
480                 git_config_set_multivar(key, value, "^$", 0);
481         }
482
483         refspec.force = 0;
484         refspec.pattern = 1;
485         refspec.src = src_ref_prefix;
486         refspec.dst = branch_top;
487
488         if (path && !is_bundle)
489                 refs = clone_local(path, git_dir);
490         else {
491                 struct remote *remote = remote_get(argv[0]);
492                 transport = transport_get(remote, remote->url[0]);
493
494                 if (!transport->get_refs_list || !transport->fetch)
495                         die("Don't know how to clone %s", transport->url);
496
497                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
498
499                 if (option_depth)
500                         transport_set_option(transport, TRANS_OPT_DEPTH,
501                                              option_depth);
502
503                 if (option_quiet)
504                         transport->verbose = -1;
505
506                 if (option_upload_pack)
507                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
508                                              option_upload_pack);
509
510                 refs = transport_get_remote_refs(transport);
511                 transport_fetch_refs(transport, refs);
512         }
513
514         clear_extra_refs();
515
516         mapped_refs = write_remote_refs(refs, &refspec, reflog_msg.buf);
517
518         head_points_at = locate_head(refs, mapped_refs, &remote_head);
519
520         if (head_points_at) {
521                 /* Local default branch link */
522                 create_symref("HEAD", head_points_at->name, NULL);
523
524                 if (!option_bare) {
525                         struct strbuf head_ref;
526                         const char *head = head_points_at->name;
527
528                         if (!prefixcmp(head, "refs/heads/"))
529                                 head += 11;
530
531                         /* Set up the initial local branch */
532
533                         /* Local branch initial value */
534                         update_ref(reflog_msg.buf, "HEAD",
535                                    head_points_at->old_sha1,
536                                    NULL, 0, DIE_ON_ERR);
537
538                         strbuf_init(&head_ref, 0);
539                         strbuf_addstr(&head_ref, branch_top);
540                         strbuf_addstr(&head_ref, "HEAD");
541
542                         /* Remote branch link */
543                         create_symref(head_ref.buf,
544                                       head_points_at->peer_ref->name,
545                                       reflog_msg.buf);
546
547                         snprintf(key, sizeof(key), "branch.%s.remote", head);
548                         git_config_set(key, option_origin);
549                         snprintf(key, sizeof(key), "branch.%s.merge", head);
550                         git_config_set(key, head_points_at->name);
551                 }
552         } else if (remote_head) {
553                 /* Source had detached HEAD pointing somewhere. */
554                 if (!option_bare)
555                         update_ref(reflog_msg.buf, "HEAD",
556                                    remote_head->old_sha1,
557                                    NULL, REF_NODEREF, DIE_ON_ERR);
558         } else {
559                 /* Nothing to checkout out */
560                 if (!option_no_checkout)
561                         warning("remote HEAD refers to nonexistent ref, "
562                                 "unable to checkout.\n");
563                 option_no_checkout = 1;
564         }
565
566         if (transport)
567                 transport_unlock_pack(transport);
568
569         if (!option_no_checkout) {
570                 struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
571                 struct unpack_trees_options opts;
572                 struct tree *tree;
573                 struct tree_desc t;
574                 int fd;
575
576                 /* We need to be in the new work tree for the checkout */
577                 setup_work_tree();
578
579                 fd = hold_locked_index(lock_file, 1);
580
581                 memset(&opts, 0, sizeof opts);
582                 opts.update = 1;
583                 opts.merge = 1;
584                 opts.fn = oneway_merge;
585                 opts.verbose_update = !option_quiet;
586                 opts.src_index = &the_index;
587                 opts.dst_index = &the_index;
588
589                 tree = parse_tree_indirect(remote_head->old_sha1);
590                 parse_tree(tree);
591                 init_tree_desc(&t, tree->buffer, tree->size);
592                 unpack_trees(1, &t, &opts);
593
594                 if (write_cache(fd, active_cache, active_nr) ||
595                     commit_locked_index(lock_file))
596                         die("unable to write new index file");
597         }
598
599         strbuf_release(&reflog_msg);
600         junk_pid = 0;
601         return 0;
602 }