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rebase: operate on a detached HEAD
[git/debian.git] / builtin-branch.c
blob3bf40f145378e06131a288d8234f123e0217a932
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 #include "remote.h"
14 #include "parse-options.h"
15
16 static const char * const builtin_branch_usage[] = {
17 "git-branch [options] [-r | -a]",
18 "git-branch [options] [-l] [-f] <branchname> [<start-point>]",
19 "git-branch [options] [-r] (-d | -D) <branchname>",
20 "git-branch [options] (-m | -M) [<oldbranch>] <newbranch>",
21 NULL
22 };
23
24 #define REF_UNKNOWN_TYPE 0x00
25 #define REF_LOCAL_BRANCH 0x01
26 #define REF_REMOTE_BRANCH 0x02
27 #define REF_TAG 0x04
28
29 static const char *head;
30 static unsigned char head_sha1[20];
31
32 static int branch_track = 1;
33
34 static int branch_use_color;
35 static char branch_colors[][COLOR_MAXLEN] = {
36 "\033[m", /* reset */
37 "", /* PLAIN (normal) */
38 "\033[31m", /* REMOTE (red) */
39 "", /* LOCAL (normal) */
40 "\033[32m", /* CURRENT (green) */
41 };
42 enum color_branch {
43 COLOR_BRANCH_RESET = 0,
44 COLOR_BRANCH_PLAIN = 1,
45 COLOR_BRANCH_REMOTE = 2,
46 COLOR_BRANCH_LOCAL = 3,
47 COLOR_BRANCH_CURRENT = 4,
48 };
49
50 static int parse_branch_color_slot(const char *var, int ofs)
51 {
52 if (!strcasecmp(var+ofs, "plain"))
53 return COLOR_BRANCH_PLAIN;
54 if (!strcasecmp(var+ofs, "reset"))
55 return COLOR_BRANCH_RESET;
56 if (!strcasecmp(var+ofs, "remote"))
57 return COLOR_BRANCH_REMOTE;
58 if (!strcasecmp(var+ofs, "local"))
59 return COLOR_BRANCH_LOCAL;
60 if (!strcasecmp(var+ofs, "current"))
61 return COLOR_BRANCH_CURRENT;
62 die("bad config variable '%s'", var);
63 }
64
65 static int git_branch_config(const char *var, const char *value)
66 {
67 if (!strcmp(var, "color.branch")) {
68 branch_use_color = git_config_colorbool(var, value);
69 return 0;
70 }
71 if (!prefixcmp(var, "color.branch.")) {
72 int slot = parse_branch_color_slot(var, 13);
73 color_parse(value, var, branch_colors[slot]);
74 return 0;
75 }
76 if (!strcmp(var, "branch.autosetupmerge"))
77 branch_track = git_config_bool(var, value);
78
79 return git_default_config(var, value);
80 }
81
82 static const char *branch_get_color(enum color_branch ix)
83 {
84 if (branch_use_color)
85 return branch_colors[ix];
86 return "";
87 }
88
89 static int delete_branches(int argc, const char **argv, int force, int kinds)
90 {
91 struct commit *rev, *head_rev = head_rev;
92 unsigned char sha1[20];
93 char *name = NULL;
94 const char *fmt, *remote;
95 char section[PATH_MAX];
96 int i;
97 int ret = 0;
98
99 switch (kinds) {
100 case REF_REMOTE_BRANCH:
101 fmt = "refs/remotes/%s";
102 remote = "remote ";
103 force = 1;
104 break;
105 case REF_LOCAL_BRANCH:
106 fmt = "refs/heads/%s";
107 remote = "";
108 break;
109 default:
110 die("cannot use -a with -d");
111 }
112
113 if (!force) {
114 head_rev = lookup_commit_reference(head_sha1);
115 if (!head_rev)
116 die("Couldn't look up commit object for HEAD");
117 }
118 for (i = 0; i < argc; i++) {
119 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
120 error("Cannot delete the branch '%s' "
121 "which you are currently on.", argv[i]);
122 ret = 1;
123 continue;
124 }
125
126 if (name)
127 free(name);
128
129 name = xstrdup(mkpath(fmt, argv[i]));
130 if (!resolve_ref(name, sha1, 1, NULL)) {
131 error("%sbranch '%s' not found.",
132 remote, argv[i]);
133 ret = 1;
134 continue;
135 }
136
137 rev = lookup_commit_reference(sha1);
138 if (!rev) {
139 error("Couldn't look up commit object for '%s'", name);
140 ret = 1;
141 continue;
142 }
143
144 /* This checks whether the merge bases of branch and
145 * HEAD contains branch -- which means that the HEAD
146 * contains everything in both.
147 */
148
149 if (!force &&
150 !in_merge_bases(rev, &head_rev, 1)) {
151 error("The branch '%s' is not an ancestor of "
152 "your current HEAD.\n"
153 "If you are sure you want to delete it, "
154 "run 'git branch -D %s'.", argv[i], argv[i]);
155 ret = 1;
156 continue;
157 }
158
159 if (delete_ref(name, sha1)) {
160 error("Error deleting %sbranch '%s'", remote,
161 argv[i]);
162 ret = 1;
163 } else {
164 printf("Deleted %sbranch %s.\n", remote, argv[i]);
165 snprintf(section, sizeof(section), "branch.%s",
166 argv[i]);
167 if (git_config_rename_section(section, NULL) < 0)
168 warning("Update of config-file failed");
169 }
170 }
171
172 if (name)
173 free(name);
174
175 return(ret);
176 }
177
178 struct ref_item {
179 char *name;
180 unsigned int kind;
181 unsigned char sha1[20];
182 };
183
184 struct ref_list {
185 int index, alloc, maxwidth;
186 struct ref_item *list;
187 int kinds;
188 };
189
190 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
191 {
192 struct ref_list *ref_list = (struct ref_list*)(cb_data);
193 struct ref_item *newitem;
194 int kind = REF_UNKNOWN_TYPE;
195 int len;
196
197 /* Detect kind */
198 if (!prefixcmp(refname, "refs/heads/")) {
199 kind = REF_LOCAL_BRANCH;
200 refname += 11;
201 } else if (!prefixcmp(refname, "refs/remotes/")) {
202 kind = REF_REMOTE_BRANCH;
203 refname += 13;
204 } else if (!prefixcmp(refname, "refs/tags/")) {
205 kind = REF_TAG;
206 refname += 10;
207 }
208
209 /* Don't add types the caller doesn't want */
210 if ((kind & ref_list->kinds) == 0)
211 return 0;
212
213 /* Resize buffer */
214 if (ref_list->index >= ref_list->alloc) {
215 ref_list->alloc = alloc_nr(ref_list->alloc);
216 ref_list->list = xrealloc(ref_list->list,
217 ref_list->alloc * sizeof(struct ref_item));
218 }
219
220 /* Record the new item */
221 newitem = &(ref_list->list[ref_list->index++]);
222 newitem->name = xstrdup(refname);
223 newitem->kind = kind;
224 hashcpy(newitem->sha1, sha1);
225 len = strlen(newitem->name);
226 if (len > ref_list->maxwidth)
227 ref_list->maxwidth = len;
228
229 return 0;
230 }
231
232 static void free_ref_list(struct ref_list *ref_list)
233 {
234 int i;
235
236 for (i = 0; i < ref_list->index; i++)
237 free(ref_list->list[i].name);
238 free(ref_list->list);
239 }
240
241 static int ref_cmp(const void *r1, const void *r2)
242 {
243 struct ref_item *c1 = (struct ref_item *)(r1);
244 struct ref_item *c2 = (struct ref_item *)(r2);
245
246 if (c1->kind != c2->kind)
247 return c1->kind - c2->kind;
248 return strcmp(c1->name, c2->name);
249 }
250
251 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
252 int abbrev, int current)
253 {
254 char c;
255 int color;
256 struct commit *commit;
257
258 switch (item->kind) {
259 case REF_LOCAL_BRANCH:
260 color = COLOR_BRANCH_LOCAL;
261 break;
262 case REF_REMOTE_BRANCH:
263 color = COLOR_BRANCH_REMOTE;
264 break;
265 default:
266 color = COLOR_BRANCH_PLAIN;
267 break;
268 }
269
270 c = ' ';
271 if (current) {
272 c = '*';
273 color = COLOR_BRANCH_CURRENT;
274 }
275
276 if (verbose) {
277 struct strbuf subject;
278 const char *sub = " **** invalid ref ****";
279
280 strbuf_init(&subject, 0);
281
282 commit = lookup_commit(item->sha1);
283 if (commit && !parse_commit(commit)) {
284 pretty_print_commit(CMIT_FMT_ONELINE, commit,
285 &subject, 0, NULL, NULL, 0, 0);
286 sub = subject.buf;
287 }
288 printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
289 maxwidth, item->name,
290 branch_get_color(COLOR_BRANCH_RESET),
291 find_unique_abbrev(item->sha1, abbrev), sub);
292 strbuf_release(&subject);
293 } else {
294 printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
295 branch_get_color(COLOR_BRANCH_RESET));
296 }
297 }
298
299 static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
300 {
301 int i;
302 struct ref_list ref_list;
303
304 memset(&ref_list, 0, sizeof(ref_list));
305 ref_list.kinds = kinds;
306 for_each_ref(append_ref, &ref_list);
307
308 qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
309
310 detached = (detached && (kinds & REF_LOCAL_BRANCH));
311 if (detached) {
312 struct ref_item item;
313 item.name = xstrdup("(no branch)");
314 item.kind = REF_LOCAL_BRANCH;
315 hashcpy(item.sha1, head_sha1);
316 if (strlen(item.name) > ref_list.maxwidth)
317 ref_list.maxwidth = strlen(item.name);
318 print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
319 free(item.name);
320 }
321
322 for (i = 0; i < ref_list.index; i++) {
323 int current = !detached &&
324 (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
325 !strcmp(ref_list.list[i].name, head);
326 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
327 abbrev, current);
328 }
329
330 free_ref_list(&ref_list);
331 }
332
333 struct tracking {
334 struct refspec spec;
335 char *src;
336 const char *remote;
337 int matches;
338 };
339
340 static int find_tracked_branch(struct remote *remote, void *priv)
341 {
342 struct tracking *tracking = priv;
343
344 if (!remote_find_tracking(remote, &tracking->spec)) {
345 if (++tracking->matches == 1) {
346 tracking->src = tracking->spec.src;
347 tracking->remote = remote->name;
348 } else {
349 free(tracking->spec.src);
350 if (tracking->src) {
351 free(tracking->src);
352 tracking->src = NULL;
353 }
354 }
355 tracking->spec.src = NULL;
356 }
357
358 return 0;
359 }
360
361
362 /*
363 * This is called when new_ref is branched off of orig_ref, and tries
364 * to infer the settings for branch.<new_ref>.{remote,merge} from the
365 * config.
366 */
367 static int setup_tracking(const char *new_ref, const char *orig_ref)
368 {
369 char key[1024];
370 struct tracking tracking;
371
372 if (strlen(new_ref) > 1024 - 7 - 7 - 1)
373 return error("Tracking not set up: name too long: %s",
374 new_ref);
375
376 memset(&tracking, 0, sizeof(tracking));
377 tracking.spec.dst = (char *)orig_ref;
378 if (for_each_remote(find_tracked_branch, &tracking) ||
379 !tracking.matches)
380 return 1;
381
382 if (tracking.matches > 1)
383 return error("Not tracking: ambiguous information for ref %s",
384 orig_ref);
385
386 if (tracking.matches == 1) {
387 sprintf(key, "branch.%s.remote", new_ref);
388 git_config_set(key, tracking.remote ? tracking.remote : ".");
389 sprintf(key, "branch.%s.merge", new_ref);
390 git_config_set(key, tracking.src);
391 free(tracking.src);
392 printf("Branch %s set up to track remote branch %s.\n",
393 new_ref, orig_ref);
394 }
395
396 return 0;
397 }
398
399 static void create_branch(const char *name, const char *start_name,
400 int force, int reflog, int track)
401 {
402 struct ref_lock *lock;
403 struct commit *commit;
404 unsigned char sha1[20];
405 char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
406 int forcing = 0;
407
408 snprintf(ref, sizeof ref, "refs/heads/%s", name);
409 if (check_ref_format(ref))
410 die("'%s' is not a valid branch name.", name);
411
412 if (resolve_ref(ref, sha1, 1, NULL)) {
413 if (!force)
414 die("A branch named '%s' already exists.", name);
415 else if (!is_bare_repository() && !strcmp(head, name))
416 die("Cannot force update the current branch.");
417 forcing = 1;
418 }
419
420 real_ref = NULL;
421 if (get_sha1(start_name, sha1))
422 die("Not a valid object name: '%s'.", start_name);
423
424 switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
425 case 0:
426 /* Not branching from any existing branch */
427 real_ref = NULL;
428 break;
429 case 1:
430 /* Unique completion -- good */
431 break;
432 default:
433 die("Ambiguous object name: '%s'.", start_name);
434 break;
435 }
436
437 if ((commit = lookup_commit_reference(sha1)) == NULL)
438 die("Not a valid branch point: '%s'.", start_name);
439 hashcpy(sha1, commit->object.sha1);
440
441 lock = lock_any_ref_for_update(ref, NULL, 0);
442 if (!lock)
443 die("Failed to lock ref for update: %s.", strerror(errno));
444
445 if (reflog)
446 log_all_ref_updates = 1;
447
448 if (forcing)
449 snprintf(msg, sizeof msg, "branch: Reset from %s",
450 start_name);
451 else
452 snprintf(msg, sizeof msg, "branch: Created from %s",
453 start_name);
454
455 /* When branching off a remote branch, set up so that git-pull
456 automatically merges from there. So far, this is only done for
457 remotes registered via .git/config. */
458 if (real_ref && track)
459 setup_tracking(name, real_ref);
460
461 if (write_ref_sha1(lock, sha1, msg) < 0)
462 die("Failed to write ref: %s.", strerror(errno));
463
464 if (real_ref)
465 free(real_ref);
466 }
467
468 static void rename_branch(const char *oldname, const char *newname, int force)
469 {
470 char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
471 unsigned char sha1[20];
472 char oldsection[PATH_MAX], newsection[PATH_MAX];
473
474 if (!oldname)
475 die("cannot rename the current branch while not on any.");
476
477 if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
478 die("Old branchname too long");
479
480 if (check_ref_format(oldref))
481 die("Invalid branch name: %s", oldref);
482
483 if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
484 die("New branchname too long");
485
486 if (check_ref_format(newref))
487 die("Invalid branch name: %s", newref);
488
489 if (resolve_ref(newref, sha1, 1, NULL) && !force)
490 die("A branch named '%s' already exists.", newname);
491
492 snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
493 oldref, newref);
494
495 if (rename_ref(oldref, newref, logmsg))
496 die("Branch rename failed");
497
498 /* no need to pass logmsg here as HEAD didn't really move */
499 if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
500 die("Branch renamed to %s, but HEAD is not updated!", newname);
501
502 snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
503 snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
504 if (git_config_rename_section(oldsection, newsection) < 0)
505 die("Branch is renamed, but update of config-file failed");
506 }
507
508 int cmd_branch(int argc, const char **argv, const char *prefix)
509 {
510 int delete = 0, force_delete = 0, force_create = 0;
511 int rename = 0, force_rename = 0;
512 int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
513 int reflog = 0, track;
514 int kinds = REF_LOCAL_BRANCH, kind_remote = 0, kind_any = 0;
515
516 struct option options[] = {
517 OPT_GROUP("Generic options"),
518 OPT__VERBOSE(&verbose),
519 OPT_BOOLEAN( 0 , "track", &track, "set up tracking mode (see git-pull(1))"),
520 OPT_BOOLEAN( 0 , "color", &branch_use_color, "use colored output"),
521 OPT_BOOLEAN('r', NULL, &kind_remote, "act on remote-tracking branches"),
522 OPT__ABBREV(&abbrev),
523
524 OPT_GROUP("Specific git-branch actions:"),
525 OPT_BOOLEAN('a', NULL, &kind_any, "list both remote-tracking and local branches"),
526 OPT_BOOLEAN('d', NULL, &delete, "delete fully merged branch"),
527 OPT_BOOLEAN('D', NULL, &force_delete, "delete branch (even if not merged)"),
528 OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
529 OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
530 OPT_BOOLEAN('m', NULL, &rename, "move/rename a branch and its reflog"),
531 OPT_BOOLEAN('M', NULL, &force_rename, "move/rename a branch, even if target exists"),
532 OPT_END(),
533 };
534
535 git_config(git_branch_config);
536 track = branch_track;
537 argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
538
539 delete |= force_delete;
540 rename |= force_rename;
541 if (kind_remote)
542 kinds = REF_REMOTE_BRANCH;
543 if (kind_any)
544 kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
545 if (abbrev && abbrev < MINIMUM_ABBREV)
546 abbrev = MINIMUM_ABBREV;
547 else if (abbrev > 40)
548 abbrev = 40;
549
550 if ((delete && rename) || (delete && force_create) ||
551 (rename && force_create))
552 usage_with_options(builtin_branch_usage, options);
553
554 head = resolve_ref("HEAD", head_sha1, 0, NULL);
555 if (!head)
556 die("Failed to resolve HEAD as a valid ref.");
557 head = xstrdup(head);
558 if (!strcmp(head, "HEAD")) {
559 detached = 1;
560 } else {
561 if (prefixcmp(head, "refs/heads/"))
562 die("HEAD not found below refs/heads!");
563 head += 11;
564 }
565
566 if (delete)
567 return delete_branches(argc, argv, force_delete, kinds);
568 else if (argc == 0)
569 print_ref_list(kinds, detached, verbose, abbrev);
570 else if (rename && (argc == 1))
571 rename_branch(head, argv[0], force_rename);
572 else if (rename && (argc == 2))
573 rename_branch(argv[0], argv[1], force_rename);
574 else if (argc <= 2)
575 create_branch(argv[0], (argc == 2) ? argv[1] : head,
576 force_create, reflog, track);
577 else
578 usage_with_options(builtin_branch_usage, options);
579
580 return 0;
581 }
git for Debian