Do not expect unlink(2) to fail on a directory.
[git] / builtin-branch.c
1 /*
2  * Builtin "git branch"
3  *
4  * Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
5  * Based on git-branch.sh by Junio C Hamano.
6  */
7
8 #include "cache.h"
9 #include "color.h"
10 #include "refs.h"
11 #include "commit.h"
12 #include "builtin.h"
13
14 static const char builtin_branch_usage[] =
15   "git-branch [-r] (-d | -D) <branchname> | [--track | --no-track] [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [--color | --no-color] [-r | -a] [-v [--abbrev=<length> | --no-abbrev]]";
16
17 #define REF_UNKNOWN_TYPE    0x00
18 #define REF_LOCAL_BRANCH    0x01
19 #define REF_REMOTE_BRANCH   0x02
20 #define REF_TAG             0x04
21
22 static const char *head;
23 static unsigned char head_sha1[20];
24
25 static int branch_track_remotes;
26
27 static int branch_use_color;
28 static char branch_colors[][COLOR_MAXLEN] = {
29         "\033[m",       /* reset */
30         "",             /* PLAIN (normal) */
31         "\033[31m",     /* REMOTE (red) */
32         "",             /* LOCAL (normal) */
33         "\033[32m",     /* CURRENT (green) */
34 };
35 enum color_branch {
36         COLOR_BRANCH_RESET = 0,
37         COLOR_BRANCH_PLAIN = 1,
38         COLOR_BRANCH_REMOTE = 2,
39         COLOR_BRANCH_LOCAL = 3,
40         COLOR_BRANCH_CURRENT = 4,
41 };
42
43 static int parse_branch_color_slot(const char *var, int ofs)
44 {
45         if (!strcasecmp(var+ofs, "plain"))
46                 return COLOR_BRANCH_PLAIN;
47         if (!strcasecmp(var+ofs, "reset"))
48                 return COLOR_BRANCH_RESET;
49         if (!strcasecmp(var+ofs, "remote"))
50                 return COLOR_BRANCH_REMOTE;
51         if (!strcasecmp(var+ofs, "local"))
52                 return COLOR_BRANCH_LOCAL;
53         if (!strcasecmp(var+ofs, "current"))
54                 return COLOR_BRANCH_CURRENT;
55         die("bad config variable '%s'", var);
56 }
57
58 int git_branch_config(const char *var, const char *value)
59 {
60         if (!strcmp(var, "color.branch")) {
61                 branch_use_color = git_config_colorbool(var, value);
62                 return 0;
63         }
64         if (!prefixcmp(var, "color.branch.")) {
65                 int slot = parse_branch_color_slot(var, 13);
66                 color_parse(value, var, branch_colors[slot]);
67                 return 0;
68         }
69         if (!strcmp(var, "branch.autosetupmerge"))
70                 branch_track_remotes = git_config_bool(var, value);
71
72         return git_default_config(var, value);
73 }
74
75 const char *branch_get_color(enum color_branch ix)
76 {
77         if (branch_use_color)
78                 return branch_colors[ix];
79         return "";
80 }
81
82 static int delete_branches(int argc, const char **argv, int force, int kinds)
83 {
84         struct commit *rev, *head_rev = head_rev;
85         unsigned char sha1[20];
86         char *name = NULL;
87         const char *fmt, *remote;
88         int i;
89         int ret = 0;
90
91         switch (kinds) {
92         case REF_REMOTE_BRANCH:
93                 fmt = "refs/remotes/%s";
94                 remote = "remote ";
95                 force = 1;
96                 break;
97         case REF_LOCAL_BRANCH:
98                 fmt = "refs/heads/%s";
99                 remote = "";
100                 break;
101         default:
102                 die("cannot use -a with -d");
103         }
104
105         if (!force) {
106                 head_rev = lookup_commit_reference(head_sha1);
107                 if (!head_rev)
108                         die("Couldn't look up commit object for HEAD");
109         }
110         for (i = 0; i < argc; i++) {
111                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
112                         error("Cannot delete the branch '%s' "
113                                 "which you are currently on.", argv[i]);
114                         ret = 1;
115                         continue;
116                 }
117
118                 if (name)
119                         free(name);
120
121                 name = xstrdup(mkpath(fmt, argv[i]));
122                 if (!resolve_ref(name, sha1, 1, NULL)) {
123                         error("%sbranch '%s' not found.",
124                                         remote, argv[i]);
125                         ret = 1;
126                         continue;
127                 }
128
129                 rev = lookup_commit_reference(sha1);
130                 if (!rev) {
131                         error("Couldn't look up commit object for '%s'", name);
132                         ret = 1;
133                         continue;
134                 }
135
136                 /* This checks whether the merge bases of branch and
137                  * HEAD contains branch -- which means that the HEAD
138                  * contains everything in both.
139                  */
140
141                 if (!force &&
142                     !in_merge_bases(rev, &head_rev, 1)) {
143                         error("The branch '%s' is not a strict subset of "
144                                 "your current HEAD.\n"
145                                 "If you are sure you want to delete it, "
146                                 "run 'git branch -D %s'.", argv[i], argv[i]);
147                         ret = 1;
148                         continue;
149                 }
150
151                 if (delete_ref(name, sha1)) {
152                         error("Error deleting %sbranch '%s'", remote,
153                                argv[i]);
154                         ret = 1;
155                 } else
156                         printf("Deleted %sbranch %s.\n", remote, argv[i]);
157
158         }
159
160         if (name)
161                 free(name);
162
163         return(ret);
164 }
165
166 struct ref_item {
167         char *name;
168         unsigned int kind;
169         unsigned char sha1[20];
170 };
171
172 struct ref_list {
173         int index, alloc, maxwidth;
174         struct ref_item *list;
175         int kinds;
176 };
177
178 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
179 {
180         struct ref_list *ref_list = (struct ref_list*)(cb_data);
181         struct ref_item *newitem;
182         int kind = REF_UNKNOWN_TYPE;
183         int len;
184
185         /* Detect kind */
186         if (!prefixcmp(refname, "refs/heads/")) {
187                 kind = REF_LOCAL_BRANCH;
188                 refname += 11;
189         } else if (!prefixcmp(refname, "refs/remotes/")) {
190                 kind = REF_REMOTE_BRANCH;
191                 refname += 13;
192         } else if (!prefixcmp(refname, "refs/tags/")) {
193                 kind = REF_TAG;
194                 refname += 10;
195         }
196
197         /* Don't add types the caller doesn't want */
198         if ((kind & ref_list->kinds) == 0)
199                 return 0;
200
201         /* Resize buffer */
202         if (ref_list->index >= ref_list->alloc) {
203                 ref_list->alloc = alloc_nr(ref_list->alloc);
204                 ref_list->list = xrealloc(ref_list->list,
205                                 ref_list->alloc * sizeof(struct ref_item));
206         }
207
208         /* Record the new item */
209         newitem = &(ref_list->list[ref_list->index++]);
210         newitem->name = xstrdup(refname);
211         newitem->kind = kind;
212         hashcpy(newitem->sha1, sha1);
213         len = strlen(newitem->name);
214         if (len > ref_list->maxwidth)
215                 ref_list->maxwidth = len;
216
217         return 0;
218 }
219
220 static void free_ref_list(struct ref_list *ref_list)
221 {
222         int i;
223
224         for (i = 0; i < ref_list->index; i++)
225                 free(ref_list->list[i].name);
226         free(ref_list->list);
227 }
228
229 static int ref_cmp(const void *r1, const void *r2)
230 {
231         struct ref_item *c1 = (struct ref_item *)(r1);
232         struct ref_item *c2 = (struct ref_item *)(r2);
233
234         if (c1->kind != c2->kind)
235                 return c1->kind - c2->kind;
236         return strcmp(c1->name, c2->name);
237 }
238
239 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
240                            int abbrev, int current)
241 {
242         char c;
243         int color;
244         struct commit *commit;
245         char subject[256];
246
247         switch (item->kind) {
248         case REF_LOCAL_BRANCH:
249                 color = COLOR_BRANCH_LOCAL;
250                 break;
251         case REF_REMOTE_BRANCH:
252                 color = COLOR_BRANCH_REMOTE;
253                 break;
254         default:
255                 color = COLOR_BRANCH_PLAIN;
256                 break;
257         }
258
259         c = ' ';
260         if (current) {
261                 c = '*';
262                 color = COLOR_BRANCH_CURRENT;
263         }
264
265         if (verbose) {
266                 commit = lookup_commit(item->sha1);
267                 if (commit && !parse_commit(commit))
268                         pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
269                                             subject, sizeof(subject), 0,
270                                             NULL, NULL, 0);
271                 else
272                         strcpy(subject, " **** invalid ref ****");
273                 printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
274                        maxwidth, item->name,
275                        branch_get_color(COLOR_BRANCH_RESET),
276                        find_unique_abbrev(item->sha1, abbrev), subject);
277         } else {
278                 printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
279                        branch_get_color(COLOR_BRANCH_RESET));
280         }
281 }
282
283 static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
284 {
285         int i;
286         struct ref_list ref_list;
287
288         memset(&ref_list, 0, sizeof(ref_list));
289         ref_list.kinds = kinds;
290         for_each_ref(append_ref, &ref_list);
291
292         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
293
294         detached = (detached && (kinds & REF_LOCAL_BRANCH));
295         if (detached) {
296                 struct ref_item item;
297                 item.name = xstrdup("(no branch)");
298                 item.kind = REF_LOCAL_BRANCH;
299                 hashcpy(item.sha1, head_sha1);
300                 if (strlen(item.name) > ref_list.maxwidth)
301                               ref_list.maxwidth = strlen(item.name);
302                 print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
303                 free(item.name);
304         }
305
306         for (i = 0; i < ref_list.index; i++) {
307                 int current = !detached &&
308                         (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
309                         !strcmp(ref_list.list[i].name, head);
310                 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
311                                abbrev, current);
312         }
313
314         free_ref_list(&ref_list);
315 }
316
317 static char *config_repo;
318 static char *config_remote;
319 static const char *start_ref;
320
321 static int get_remote_branch_name(const char *value)
322 {
323         const char *colon;
324         const char *end;
325
326         if (*value == '+')
327                 value++;
328
329         colon = strchr(value, ':');
330         if (!colon)
331                 return 0;
332
333         end = value + strlen(value);
334
335         /*
336          * Try an exact match first.  I.e. handle the case where the
337          * value is "$anything:refs/foo/bar/baz" and start_ref is exactly
338          * "refs/foo/bar/baz". Then the name at the remote is $anything.
339          */
340         if (!strcmp(colon + 1, start_ref)) {
341                 /* Truncate the value before the colon. */
342                 nfasprintf(&config_repo, "%.*s", colon - value, value);
343                 return 1;
344         }
345
346         /*
347          * Is this a wildcard match?
348          */
349         if ((end - 2 <= value) || end[-2] != '/' || end[-1] != '*' ||
350             (colon - 2 <= value) || colon[-2] != '/' || colon[-1] != '*')
351                 return 0;
352
353         /*
354          * Value is "refs/foo/bar/<asterisk>:refs/baz/boa/<asterisk>"
355          * and start_ref begins with "refs/baz/boa/"; the name at the
356          * remote is refs/foo/bar/ with the remaining part of the
357          * start_ref.  The length of the prefix on the RHS is (end -
358          * colon - 2), including the slash immediately before the
359          * asterisk.
360          */
361         if ((strlen(start_ref) < end - colon - 2) ||
362             memcmp(start_ref, colon + 1, end - colon - 2))
363                 return 0; /* does not match prefix */
364
365         /* Replace the asterisk with the remote branch name.  */
366         nfasprintf(&config_repo, "%.*s%s",
367                    (colon - 1) - value, value,
368                    start_ref + (end - colon - 2));
369         return 1;
370 }
371
372 static int get_remote_config(const char *key, const char *value)
373 {
374         const char *var;
375         if (prefixcmp(key, "remote."))
376                 return 0;
377
378         var = strrchr(key, '.');
379         if (var == key + 6 || strcmp(var, ".fetch"))
380                 return 0;
381         /*
382          * Ok, we are looking at key == "remote.$foo.fetch";
383          */
384         if (get_remote_branch_name(value))
385                 nfasprintf(&config_remote, "%.*s", var - (key + 7), key + 7);
386
387         return 0;
388 }
389
390 static void set_branch_merge(const char *name, const char *config_remote,
391                              const char *config_repo)
392 {
393         char key[1024];
394         if (sizeof(key) <=
395             snprintf(key, sizeof(key), "branch.%s.remote", name))
396                 die("what a long branch name you have!");
397         git_config_set(key, config_remote);
398
399         /*
400          * We do not have to check if we have enough space for
401          * the 'merge' key, since it's shorter than the
402          * previous 'remote' key, which we already checked.
403          */
404         snprintf(key, sizeof(key), "branch.%s.merge", name);
405         git_config_set(key, config_repo);
406 }
407
408 static void set_branch_defaults(const char *name, const char *real_ref)
409 {
410         /*
411          * name is the name of new branch under refs/heads;
412          * real_ref is typically refs/remotes/$foo/$bar, where
413          * $foo is the remote name (there typically are no slashes)
414          * and $bar is the branch name we map from the remote
415          * (it could have slashes).
416          */
417         start_ref = real_ref;
418         git_config(get_remote_config);
419         if (!config_repo && !config_remote &&
420             !prefixcmp(real_ref, "refs/heads/")) {
421                 set_branch_merge(name, ".", real_ref);
422                 printf("Branch %s set up to track local branch %s.\n",
423                        name, real_ref);
424         }
425
426         if (config_repo && config_remote) {
427                 set_branch_merge(name, config_remote, config_repo);
428                 printf("Branch %s set up to track remote branch %s.\n",
429                        name, real_ref);
430         }
431
432         if (config_repo)
433                 free(config_repo);
434         if (config_remote)
435                 free(config_remote);
436 }
437
438 static void create_branch(const char *name, const char *start_name,
439                           int force, int reflog, int track)
440 {
441         struct ref_lock *lock;
442         struct commit *commit;
443         unsigned char sha1[20];
444         char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
445         int forcing = 0;
446
447         snprintf(ref, sizeof ref, "refs/heads/%s", name);
448         if (check_ref_format(ref))
449                 die("'%s' is not a valid branch name.", name);
450
451         if (resolve_ref(ref, sha1, 1, NULL)) {
452                 if (!force)
453                         die("A branch named '%s' already exists.", name);
454                 else if (!is_bare_repository() && !strcmp(head, name))
455                         die("Cannot force update the current branch.");
456                 forcing = 1;
457         }
458
459         real_ref = NULL;
460         if (get_sha1(start_name, sha1))
461                 die("Not a valid object name: '%s'.", start_name);
462
463         switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
464         case 0:
465                 /* Not branching from any existing branch */
466                 real_ref = NULL;
467                 break;
468         case 1:
469                 /* Unique completion -- good */
470                 break;
471         default:
472                 die("Ambiguous object name: '%s'.", start_name);
473                 break;
474         }
475
476         if ((commit = lookup_commit_reference(sha1)) == NULL)
477                 die("Not a valid branch point: '%s'.", start_name);
478         hashcpy(sha1, commit->object.sha1);
479
480         lock = lock_any_ref_for_update(ref, NULL);
481         if (!lock)
482                 die("Failed to lock ref for update: %s.", strerror(errno));
483
484         if (reflog)
485                 log_all_ref_updates = 1;
486
487         if (forcing)
488                 snprintf(msg, sizeof msg, "branch: Reset from %s",
489                          start_name);
490         else
491                 snprintf(msg, sizeof msg, "branch: Created from %s",
492                          start_name);
493
494         /* When branching off a remote branch, set up so that git-pull
495            automatically merges from there.  So far, this is only done for
496            remotes registered via .git/config.  */
497         if (real_ref && track)
498                 set_branch_defaults(name, real_ref);
499
500         if (write_ref_sha1(lock, sha1, msg) < 0)
501                 die("Failed to write ref: %s.", strerror(errno));
502
503         if (real_ref)
504                 free(real_ref);
505 }
506
507 static void rename_branch(const char *oldname, const char *newname, int force)
508 {
509         char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
510         unsigned char sha1[20];
511         char oldsection[PATH_MAX], newsection[PATH_MAX];
512
513         if (!oldname)
514                 die("cannot rename the current branch while not on any.");
515
516         if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
517                 die("Old branchname too long");
518
519         if (check_ref_format(oldref))
520                 die("Invalid branch name: %s", oldref);
521
522         if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
523                 die("New branchname too long");
524
525         if (check_ref_format(newref))
526                 die("Invalid branch name: %s", newref);
527
528         if (resolve_ref(newref, sha1, 1, NULL) && !force)
529                 die("A branch named '%s' already exists.", newname);
530
531         snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
532                  oldref, newref);
533
534         if (rename_ref(oldref, newref, logmsg))
535                 die("Branch rename failed");
536
537         /* no need to pass logmsg here as HEAD didn't really move */
538         if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
539                 die("Branch renamed to %s, but HEAD is not updated!", newname);
540
541         snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
542         snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
543         if (git_config_rename_section(oldsection, newsection) < 0)
544                 die("Branch is renamed, but update of config-file failed");
545 }
546
547 int cmd_branch(int argc, const char **argv, const char *prefix)
548 {
549         int delete = 0, force_delete = 0, force_create = 0;
550         int rename = 0, force_rename = 0;
551         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
552         int reflog = 0, track;
553         int kinds = REF_LOCAL_BRANCH;
554         int i;
555
556         git_config(git_branch_config);
557         track = branch_track_remotes;
558
559         for (i = 1; i < argc; i++) {
560                 const char *arg = argv[i];
561
562                 if (arg[0] != '-')
563                         break;
564                 if (!strcmp(arg, "--")) {
565                         i++;
566                         break;
567                 }
568                 if (!strcmp(arg, "--track")) {
569                         track = 1;
570                         continue;
571                 }
572                 if (!strcmp(arg, "--no-track")) {
573                         track = 0;
574                         continue;
575                 }
576                 if (!strcmp(arg, "-d")) {
577                         delete = 1;
578                         continue;
579                 }
580                 if (!strcmp(arg, "-D")) {
581                         delete = 1;
582                         force_delete = 1;
583                         continue;
584                 }
585                 if (!strcmp(arg, "-f")) {
586                         force_create = 1;
587                         continue;
588                 }
589                 if (!strcmp(arg, "-m")) {
590                         rename = 1;
591                         continue;
592                 }
593                 if (!strcmp(arg, "-M")) {
594                         rename = 1;
595                         force_rename = 1;
596                         continue;
597                 }
598                 if (!strcmp(arg, "-r")) {
599                         kinds = REF_REMOTE_BRANCH;
600                         continue;
601                 }
602                 if (!strcmp(arg, "-a")) {
603                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
604                         continue;
605                 }
606                 if (!strcmp(arg, "-l")) {
607                         reflog = 1;
608                         continue;
609                 }
610                 if (!prefixcmp(arg, "--no-abbrev")) {
611                         abbrev = 0;
612                         continue;
613                 }
614                 if (!prefixcmp(arg, "--abbrev=")) {
615                         abbrev = strtoul(arg + 9, NULL, 10);
616                         if (abbrev < MINIMUM_ABBREV)
617                                 abbrev = MINIMUM_ABBREV;
618                         else if (abbrev > 40)
619                                 abbrev = 40;
620                         continue;
621                 }
622                 if (!strcmp(arg, "-v")) {
623                         verbose = 1;
624                         continue;
625                 }
626                 if (!strcmp(arg, "--color")) {
627                         branch_use_color = 1;
628                         continue;
629                 }
630                 if (!strcmp(arg, "--no-color")) {
631                         branch_use_color = 0;
632                         continue;
633                 }
634                 usage(builtin_branch_usage);
635         }
636
637         if ((delete && rename) || (delete && force_create) ||
638             (rename && force_create))
639                 usage(builtin_branch_usage);
640
641         head = resolve_ref("HEAD", head_sha1, 0, NULL);
642         if (!head)
643                 die("Failed to resolve HEAD as a valid ref.");
644         head = xstrdup(head);
645         if (!strcmp(head, "HEAD")) {
646                 detached = 1;
647         }
648         else {
649                 if (prefixcmp(head, "refs/heads/"))
650                         die("HEAD not found below refs/heads!");
651                 head += 11;
652         }
653
654         if (delete)
655                 return delete_branches(argc - i, argv + i, force_delete, kinds);
656         else if (i == argc)
657                 print_ref_list(kinds, detached, verbose, abbrev);
658         else if (rename && (i == argc - 1))
659                 rename_branch(head, argv[i], force_rename);
660         else if (rename && (i == argc - 2))
661                 rename_branch(argv[i], argv[i + 1], force_rename);
662         else if (i == argc - 1 || i == argc - 2)
663                 create_branch(argv[i], (i == argc - 2) ? argv[i+1] : head,
664                               force_create, reflog, track);
665         else
666                 usage(builtin_branch_usage);
667
668         return 0;
669 }