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 static 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 static 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         char section[PATH_MAX];
  89         int i;
  90         int ret = 0;
  91
  92         switch (kinds) {
  93         case REF_REMOTE_BRANCH:
  94                 fmt = "refs/remotes/%s";
  95                 remote = "remote ";
  96                 force = 1;
  97                 break;
  98         case REF_LOCAL_BRANCH:
  99                 fmt = "refs/heads/%s";
 100                 remote = "";
 101                 break;
 102         default:
 103                 die("cannot use -a with -d");
 104         }
 105
 106         if (!force) {
 107                 head_rev = lookup_commit_reference(head_sha1);
 108                 if (!head_rev)
 109                         die("Couldn't look up commit object for HEAD");
 110         }
 111         for (i = 0; i < argc; i++) {
 112                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
 113                         error("Cannot delete the branch '%s' "
 114                                 "which you are currently on.", argv[i]);
 115                         ret = 1;
 116                         continue;
 117                 }
 118
 119                 if (name)
 120                         free(name);
 121
 122                 name = xstrdup(mkpath(fmt, argv[i]));
 123                 if (!resolve_ref(name, sha1, 1, NULL)) {
 124                         error("%sbranch '%s' not found.",
 125                                         remote, argv[i]);
 126                         ret = 1;
 127                         continue;
 128                 }
 129
 130                 rev = lookup_commit_reference(sha1);
 131                 if (!rev) {
 132                         error("Couldn't look up commit object for '%s'", name);
 133                         ret = 1;
 134                         continue;
 135                 }
 136
 137                 /* This checks whether the merge bases of branch and
 138                  * HEAD contains branch -- which means that the HEAD
 139                  * contains everything in both.
 140                  */
 141
 142                 if (!force &&
 143                     !in_merge_bases(rev, &head_rev, 1)) {
 144                         error("The branch '%s' is not a strict subset of "
 145                                 "your current HEAD.\n"
 146                                 "If you are sure you want to delete it, "
 147                                 "run 'git branch -D %s'.", argv[i], argv[i]);
 148                         ret = 1;
 149                         continue;
 150                 }
 151
 152                 if (delete_ref(name, sha1)) {
 153                         error("Error deleting %sbranch '%s'", remote,
 154                                argv[i]);
 155                         ret = 1;
 156                 } else {
 157                         printf("Deleted %sbranch %s.\n", remote, argv[i]);
 158                         snprintf(section, sizeof(section), "branch.%s",
 159                                  argv[i]);
 160                         if (git_config_rename_section(section, NULL) < 0)
 161                                 warning("Update of config-file failed");
 162                 }
 163         }
 164
 165         if (name)
 166                 free(name);
 167
 168         return(ret);
 169 }
 170
 171 struct ref_item {
 172         char *name;
 173         unsigned int kind;
 174         unsigned char sha1[20];
 175 };
 176
 177 struct ref_list {
 178         int index, alloc, maxwidth;
 179         struct ref_item *list;
 180         int kinds;
 181 };
 182
 183 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 184 {
 185         struct ref_list *ref_list = (struct ref_list*)(cb_data);
 186         struct ref_item *newitem;
 187         int kind = REF_UNKNOWN_TYPE;
 188         int len;
 189
 190         /* Detect kind */
 191         if (!prefixcmp(refname, "refs/heads/")) {
 192                 kind = REF_LOCAL_BRANCH;
 193                 refname += 11;
 194         } else if (!prefixcmp(refname, "refs/remotes/")) {
 195                 kind = REF_REMOTE_BRANCH;
 196                 refname += 13;
 197         } else if (!prefixcmp(refname, "refs/tags/")) {
 198                 kind = REF_TAG;
 199                 refname += 10;
 200         }
 201
 202         /* Don't add types the caller doesn't want */
 203         if ((kind & ref_list->kinds) == 0)
 204                 return 0;
 205
 206         /* Resize buffer */
 207         if (ref_list->index >= ref_list->alloc) {
 208                 ref_list->alloc = alloc_nr(ref_list->alloc);
 209                 ref_list->list = xrealloc(ref_list->list,
 210                                 ref_list->alloc * sizeof(struct ref_item));
 211         }
 212
 213         /* Record the new item */
 214         newitem = &(ref_list->list[ref_list->index++]);
 215         newitem->name = xstrdup(refname);
 216         newitem->kind = kind;
 217         hashcpy(newitem->sha1, sha1);
 218         len = strlen(newitem->name);
 219         if (len > ref_list->maxwidth)
 220                 ref_list->maxwidth = len;
 221
 222         return 0;
 223 }
 224
 225 static void free_ref_list(struct ref_list *ref_list)
 226 {
 227         int i;
 228
 229         for (i = 0; i < ref_list->index; i++)
 230                 free(ref_list->list[i].name);
 231         free(ref_list->list);
 232 }
 233
 234 static int ref_cmp(const void *r1, const void *r2)
 235 {
 236         struct ref_item *c1 = (struct ref_item *)(r1);
 237         struct ref_item *c2 = (struct ref_item *)(r2);
 238
 239         if (c1->kind != c2->kind)
 240                 return c1->kind - c2->kind;
 241         return strcmp(c1->name, c2->name);
 242 }
 243
 244 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 245                            int abbrev, int current)
 246 {
 247         char c;
 248         int color;
 249         struct commit *commit;
 250         char subject[256];
 251
 252         switch (item->kind) {
 253         case REF_LOCAL_BRANCH:
 254                 color = COLOR_BRANCH_LOCAL;
 255                 break;
 256         case REF_REMOTE_BRANCH:
 257                 color = COLOR_BRANCH_REMOTE;
 258                 break;
 259         default:
 260                 color = COLOR_BRANCH_PLAIN;
 261                 break;
 262         }
 263
 264         c = ' ';
 265         if (current) {
 266                 c = '*';
 267                 color = COLOR_BRANCH_CURRENT;
 268         }
 269
 270         if (verbose) {
 271                 commit = lookup_commit(item->sha1);
 272                 if (commit && !parse_commit(commit))
 273                         pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 274                                             subject, sizeof(subject), 0,
 275                                             NULL, NULL, 0);
 276                 else
 277                         strcpy(subject, " **** invalid ref ****");
 278                 printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
 279                        maxwidth, item->name,
 280                        branch_get_color(COLOR_BRANCH_RESET),
 281                        find_unique_abbrev(item->sha1, abbrev), subject);
 282         } else {
 283                 printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
 284                        branch_get_color(COLOR_BRANCH_RESET));
 285         }
 286 }
 287
 288 static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
 289 {
 290         int i;
 291         struct ref_list ref_list;
 292
 293         memset(&ref_list, 0, sizeof(ref_list));
 294         ref_list.kinds = kinds;
 295         for_each_ref(append_ref, &ref_list);
 296
 297         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 298
 299         detached = (detached && (kinds & REF_LOCAL_BRANCH));
 300         if (detached) {
 301                 struct ref_item item;
 302                 item.name = xstrdup("(no branch)");
 303                 item.kind = REF_LOCAL_BRANCH;
 304                 hashcpy(item.sha1, head_sha1);
 305                 if (strlen(item.name) > ref_list.maxwidth)
 306                               ref_list.maxwidth = strlen(item.name);
 307                 print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
 308                 free(item.name);
 309         }
 310
 311         for (i = 0; i < ref_list.index; i++) {
 312                 int current = !detached &&
 313                         (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
 314                         !strcmp(ref_list.list[i].name, head);
 315                 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
 316                                abbrev, current);
 317         }
 318
 319         free_ref_list(&ref_list);
 320 }
 321
 322 static char *config_repo;
 323 static char *config_remote;
 324 static const char *start_ref;
 325
 326 static int get_remote_branch_name(const char *value)
 327 {
 328         const char *colon;
 329         const char *end;
 330
 331         if (*value == '+')
 332                 value++;
 333
 334         colon = strchr(value, ':');
 335         if (!colon)
 336                 return 0;
 337
 338         end = value + strlen(value);
 339
 340         /*
 341          * Try an exact match first.  I.e. handle the case where the
 342          * value is "$anything:refs/foo/bar/baz" and start_ref is exactly
 343          * "refs/foo/bar/baz". Then the name at the remote is $anything.
 344          */
 345         if (!strcmp(colon + 1, start_ref)) {
 346                 /* Truncate the value before the colon. */
 347                 nfasprintf(&config_repo, "%.*s", colon - value, value);
 348                 return 1;
 349         }
 350
 351         /*
 352          * Is this a wildcard match?
 353          */
 354         if ((end - 2 <= value) || end[-2] != '/' || end[-1] != '*' ||
 355             (colon - 2 <= value) || colon[-2] != '/' || colon[-1] != '*')
 356                 return 0;
 357
 358         /*
 359          * Value is "refs/foo/bar/<asterisk>:refs/baz/boa/<asterisk>"
 360          * and start_ref begins with "refs/baz/boa/"; the name at the
 361          * remote is refs/foo/bar/ with the remaining part of the
 362          * start_ref.  The length of the prefix on the RHS is (end -
 363          * colon - 2), including the slash immediately before the
 364          * asterisk.
 365          */
 366         if ((strlen(start_ref) < end - colon - 2) ||
 367             memcmp(start_ref, colon + 1, end - colon - 2))
 368                 return 0; /* does not match prefix */
 369
 370         /* Replace the asterisk with the remote branch name.  */
 371         nfasprintf(&config_repo, "%.*s%s",
 372                    (colon - 1) - value, value,
 373                    start_ref + (end - colon - 2));
 374         return 1;
 375 }
 376
 377 static int get_remote_config(const char *key, const char *value)
 378 {
 379         const char *var;
 380         if (prefixcmp(key, "remote."))
 381                 return 0;
 382
 383         var = strrchr(key, '.');
 384         if (var == key + 6 || strcmp(var, ".fetch"))
 385                 return 0;
 386         /*
 387          * Ok, we are looking at key == "remote.$foo.fetch";
 388          */
 389         if (get_remote_branch_name(value))
 390                 nfasprintf(&config_remote, "%.*s", var - (key + 7), key + 7);
 391
 392         return 0;
 393 }
 394
 395 static void set_branch_merge(const char *name, const char *config_remote,
 396                              const char *config_repo)
 397 {
 398         char key[1024];
 399         if (sizeof(key) <=
 400             snprintf(key, sizeof(key), "branch.%s.remote", name))
 401                 die("what a long branch name you have!");
 402         git_config_set(key, config_remote);
 403
 404         /*
 405          * We do not have to check if we have enough space for
 406          * the 'merge' key, since it's shorter than the
 407          * previous 'remote' key, which we already checked.
 408          */
 409         snprintf(key, sizeof(key), "branch.%s.merge", name);
 410         git_config_set(key, config_repo);
 411 }
 412
 413 static void set_branch_defaults(const char *name, const char *real_ref)
 414 {
 415         /*
 416          * name is the name of new branch under refs/heads;
 417          * real_ref is typically refs/remotes/$foo/$bar, where
 418          * $foo is the remote name (there typically are no slashes)
 419          * and $bar is the branch name we map from the remote
 420          * (it could have slashes).
 421          */
 422         start_ref = real_ref;
 423         git_config(get_remote_config);
 424         if (!config_repo && !config_remote &&
 425             !prefixcmp(real_ref, "refs/heads/")) {
 426                 set_branch_merge(name, ".", real_ref);
 427                 printf("Branch %s set up to track local branch %s.\n",
 428                        name, real_ref);
 429         }
 430
 431         if (config_repo && config_remote) {
 432                 set_branch_merge(name, config_remote, config_repo);
 433                 printf("Branch %s set up to track remote branch %s.\n",
 434                        name, real_ref);
 435         }
 436
 437         if (config_repo)
 438                 free(config_repo);
 439         if (config_remote)
 440                 free(config_remote);
 441 }
 442
 443 static void create_branch(const char *name, const char *start_name,
 444                           int force, int reflog, int track)
 445 {
 446         struct ref_lock *lock;
 447         struct commit *commit;
 448         unsigned char sha1[20];
 449         char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
 450         int forcing = 0;
 451
 452         snprintf(ref, sizeof ref, "refs/heads/%s", name);
 453         if (check_ref_format(ref))
 454                 die("'%s' is not a valid branch name.", name);
 455
 456         if (resolve_ref(ref, sha1, 1, NULL)) {
 457                 if (!force)
 458                         die("A branch named '%s' already exists.", name);
 459                 else if (!is_bare_repository() && !strcmp(head, name))
 460                         die("Cannot force update the current branch.");
 461                 forcing = 1;
 462         }
 463
 464         real_ref = NULL;
 465         if (get_sha1(start_name, sha1))
 466                 die("Not a valid object name: '%s'.", start_name);
 467
 468         switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
 469         case 0:
 470                 /* Not branching from any existing branch */
 471                 real_ref = NULL;
 472                 break;
 473         case 1:
 474                 /* Unique completion -- good */
 475                 break;
 476         default:
 477                 die("Ambiguous object name: '%s'.", start_name);
 478                 break;
 479         }
 480
 481         if ((commit = lookup_commit_reference(sha1)) == NULL)
 482                 die("Not a valid branch point: '%s'.", start_name);
 483         hashcpy(sha1, commit->object.sha1);
 484
 485         lock = lock_any_ref_for_update(ref, NULL, 0);
 486         if (!lock)
 487                 die("Failed to lock ref for update: %s.", strerror(errno));
 488
 489         if (reflog)
 490                 log_all_ref_updates = 1;
 491
 492         if (forcing)
 493                 snprintf(msg, sizeof msg, "branch: Reset from %s",
 494                          start_name);
 495         else
 496                 snprintf(msg, sizeof msg, "branch: Created from %s",
 497                          start_name);
 498
 499         /* When branching off a remote branch, set up so that git-pull
 500            automatically merges from there.  So far, this is only done for
 501            remotes registered via .git/config.  */
 502         if (real_ref && track)
 503                 set_branch_defaults(name, real_ref);
 504
 505         if (write_ref_sha1(lock, sha1, msg) < 0)
 506                 die("Failed to write ref: %s.", strerror(errno));
 507
 508         if (real_ref)
 509                 free(real_ref);
 510 }
 511
 512 static void rename_branch(const char *oldname, const char *newname, int force)
 513 {
 514         char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
 515         unsigned char sha1[20];
 516         char oldsection[PATH_MAX], newsection[PATH_MAX];
 517
 518         if (!oldname)
 519                 die("cannot rename the current branch while not on any.");
 520
 521         if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
 522                 die("Old branchname too long");
 523
 524         if (check_ref_format(oldref))
 525                 die("Invalid branch name: %s", oldref);
 526
 527         if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
 528                 die("New branchname too long");
 529
 530         if (check_ref_format(newref))
 531                 die("Invalid branch name: %s", newref);
 532
 533         if (resolve_ref(newref, sha1, 1, NULL) && !force)
 534                 die("A branch named '%s' already exists.", newname);
 535
 536         snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
 537                  oldref, newref);
 538
 539         if (rename_ref(oldref, newref, logmsg))
 540                 die("Branch rename failed");
 541
 542         /* no need to pass logmsg here as HEAD didn't really move */
 543         if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
 544                 die("Branch renamed to %s, but HEAD is not updated!", newname);
 545
 546         snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
 547         snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
 548         if (git_config_rename_section(oldsection, newsection) < 0)
 549                 die("Branch is renamed, but update of config-file failed");
 550 }
 551
 552 int cmd_branch(int argc, const char **argv, const char *prefix)
 553 {
 554         int delete = 0, force_delete = 0, force_create = 0;
 555         int rename = 0, force_rename = 0;
 556         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 557         int reflog = 0, track;
 558         int kinds = REF_LOCAL_BRANCH;
 559         int i;
 560
 561         git_config(git_branch_config);
 562         track = branch_track_remotes;
 563
 564         for (i = 1; i < argc; i++) {
 565                 const char *arg = argv[i];
 566
 567                 if (arg[0] != '-')
 568                         break;
 569                 if (!strcmp(arg, "--")) {
 570                         i++;
 571                         break;
 572                 }
 573                 if (!strcmp(arg, "--track")) {
 574                         track = 1;
 575                         continue;
 576                 }
 577                 if (!strcmp(arg, "--no-track")) {
 578                         track = 0;
 579                         continue;
 580                 }
 581                 if (!strcmp(arg, "-d")) {
 582                         delete = 1;
 583                         continue;
 584                 }
 585                 if (!strcmp(arg, "-D")) {
 586                         delete = 1;
 587                         force_delete = 1;
 588                         continue;
 589                 }
 590                 if (!strcmp(arg, "-f")) {
 591                         force_create = 1;
 592                         continue;
 593                 }
 594                 if (!strcmp(arg, "-m")) {
 595                         rename = 1;
 596                         continue;
 597                 }
 598                 if (!strcmp(arg, "-M")) {
 599                         rename = 1;
 600                         force_rename = 1;
 601                         continue;
 602                 }
 603                 if (!strcmp(arg, "-r")) {
 604                         kinds = REF_REMOTE_BRANCH;
 605                         continue;
 606                 }
 607                 if (!strcmp(arg, "-a")) {
 608                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 609                         continue;
 610                 }
 611                 if (!strcmp(arg, "-l")) {
 612                         reflog = 1;
 613                         continue;
 614                 }
 615                 if (!prefixcmp(arg, "--no-abbrev")) {
 616                         abbrev = 0;
 617                         continue;
 618                 }
 619                 if (!prefixcmp(arg, "--abbrev=")) {
 620                         abbrev = strtoul(arg + 9, NULL, 10);
 621                         if (abbrev < MINIMUM_ABBREV)
 622                                 abbrev = MINIMUM_ABBREV;
 623                         else if (abbrev > 40)
 624                                 abbrev = 40;
 625                         continue;
 626                 }
 627                 if (!strcmp(arg, "-v")) {
 628                         verbose = 1;
 629                         continue;
 630                 }
 631                 if (!strcmp(arg, "--color")) {
 632                         branch_use_color = 1;
 633                         continue;
 634                 }
 635                 if (!strcmp(arg, "--no-color")) {
 636                         branch_use_color = 0;
 637                         continue;
 638                 }
 639                 usage(builtin_branch_usage);
 640         }
 641
 642         if ((delete && rename) || (delete && force_create) ||
 643             (rename && force_create))
 644                 usage(builtin_branch_usage);
 645
 646         head = resolve_ref("HEAD", head_sha1, 0, NULL);
 647         if (!head)
 648                 die("Failed to resolve HEAD as a valid ref.");
 649         head = xstrdup(head);
 650         if (!strcmp(head, "HEAD")) {
 651                 detached = 1;
 652         }
 653         else {
 654                 if (prefixcmp(head, "refs/heads/"))
 655                         die("HEAD not found below refs/heads!");
 656                 head += 11;
 657         }
 658
 659         if (delete)
 660                 return delete_branches(argc - i, argv + i, force_delete, kinds);
 661         else if (i == argc)
 662                 print_ref_list(kinds, detached, verbose, abbrev);
 663         else if (rename && (i == argc - 1))
 664                 rename_branch(head, argv[i], force_rename);
 665         else if (rename && (i == argc - 2))
 666                 rename_branch(argv[i], argv[i + 1], force_rename);
 667         else if (i == argc - 1 || i == argc - 2)
 668                 create_branch(argv[i], (i == argc - 2) ? argv[i+1] : head,
 669                               force_create, reflog, track);
 670         else
 671                 usage(builtin_branch_usage);
 672
 673         return 0;
 674 }