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 #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, rename = 0, force_create = 0;
 511         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 512         int reflog = 0, track;
 513         int kinds = REF_LOCAL_BRANCH;
 514
 515         struct option options[] = {
 516                 OPT_GROUP("Generic options"),
 517                 OPT__VERBOSE(&verbose),
 518                 OPT_BOOLEAN( 0 , "track",  &track, "set up tracking mode (see git-pull(1))"),
 519                 OPT_BOOLEAN( 0 , "color",  &branch_use_color, "use colored output"),
 520                 OPT_SET_INT('r', NULL,     &kinds, "act on remote-tracking branches",
 521                         REF_REMOTE_BRANCH),
 522                 OPT__ABBREV(&abbrev),
 523
 524                 OPT_GROUP("Specific git-branch actions:"),
 525                 OPT_SET_INT('a', NULL, &kinds, "list both remote-tracking and local branches",
 526                         REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
 527                 OPT_BIT('d', NULL, &delete, "delete fully merged branch", 1),
 528                 OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
 529                 OPT_BIT('m', NULL, &rename, "move/rename a branch and its reflog", 1),
 530                 OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
 531                 OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
 532                 OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
 533                 OPT_END(),
 534         };
 535
 536         git_config(git_branch_config);
 537         track = branch_track;
 538         argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
 539         if (!!delete + !!rename + !!force_create > 1)
 540                 usage_with_options(builtin_branch_usage, options);
 541
 542         head = resolve_ref("HEAD", head_sha1, 0, NULL);
 543         if (!head)
 544                 die("Failed to resolve HEAD as a valid ref.");
 545         head = xstrdup(head);
 546         if (!strcmp(head, "HEAD")) {
 547                 detached = 1;
 548         } else {
 549                 if (prefixcmp(head, "refs/heads/"))
 550                         die("HEAD not found below refs/heads!");
 551                 head += 11;
 552         }
 553
 554         if (delete)
 555                 return delete_branches(argc, argv, delete > 1, kinds);
 556         else if (argc == 0)
 557                 print_ref_list(kinds, detached, verbose, abbrev);
 558         else if (rename && (argc == 1))
 559                 rename_branch(head, argv[0], rename > 1);
 560         else if (rename && (argc == 2))
 561                 rename_branch(argv[0], argv[1], rename > 1);
 562         else if (argc <= 2)
 563                 create_branch(argv[0], (argc == 2) ? argv[1] : head,
 564                               force_create, reflog, track);
 565         else
 566                 usage_with_options(builtin_branch_usage, options);
 567
 568         return 0;
 569 }