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 static int start_len;
 321 static int base_len;
 322
 323 static int get_remote_branch_name(const char *value)
 324 {
 325         const char *colon;
 326         const char *end;
 327
 328         if (*value == '+')
 329                 value++;
 330
 331         colon = strchr(value, ':');
 332         if (!colon)
 333                 return 0;
 334
 335         end = value + strlen(value);
 336
 337         /* Try an exact match first.  */
 338         if (!strcmp(colon + 1, start_ref)) {
 339                 /* Truncate the value before the colon.  */
 340                 nfasprintf(&config_repo, "%.*s", colon - value, value);
 341                 return 1;
 342         }
 343
 344         /* Try with a wildcard match now.  */
 345         if (end - value > 2 && end[-2] == '/' && end[-1] == '*' &&
 346             colon - value > 2 && colon[-2] == '/' && colon[-1] == '*' &&
 347             (end - 2) - (colon + 1) == base_len &&
 348             !strncmp(colon + 1, start_ref, base_len)) {
 349                 /* Replace the star with the remote branch name.  */
 350                 nfasprintf(&config_repo, "%.*s%s",
 351                            (colon - 2) - value, value,
 352                            start_ref + base_len);
 353                 return 1;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int get_remote_config(const char *key, const char *value)
 360 {
 361         const char *var;
 362         if (prefixcmp(key, "remote."))
 363                 return 0;
 364
 365         var = strrchr(key, '.');
 366         if (var == key + 6)
 367                 return 0;
 368
 369         if (!strcmp(var, ".fetch") && get_remote_branch_name(value))
 370                 nfasprintf(&config_remote, "%.*s", var - (key + 7), key + 7);
 371
 372         return 0;
 373 }
 374
 375 static void set_branch_merge(const char *name, const char *config_remote,
 376                              const char *config_repo)
 377 {
 378         char key[1024];
 379         if (sizeof(key) <=
 380             snprintf(key, sizeof(key), "branch.%s.remote", name))
 381                 die("what a long branch name you have!");
 382         git_config_set(key, config_remote);
 383
 384         /*
 385          * We do not have to check if we have enough space for
 386          * the 'merge' key, since it's shorter than the
 387          * previous 'remote' key, which we already checked.
 388          */
 389         snprintf(key, sizeof(key), "branch.%s.merge", name);
 390         git_config_set(key, config_repo);
 391 }
 392
 393 static void set_branch_defaults(const char *name, const char *real_ref)
 394 {
 395         const char *slash = strrchr(real_ref, '/');
 396
 397         if (!slash)
 398                 return;
 399
 400         start_ref = real_ref;
 401         start_len = strlen(real_ref);
 402         base_len = slash - real_ref;
 403         git_config(get_remote_config);
 404         if (!config_repo && !config_remote &&
 405             !prefixcmp(real_ref, "refs/heads/")) {
 406                 set_branch_merge(name, ".", real_ref);
 407                 printf("Branch %s set up to track local branch %s.\n",
 408                        name, real_ref);
 409         }
 410
 411         if (config_repo && config_remote) {
 412                 set_branch_merge(name, config_remote, config_repo);
 413                 printf("Branch %s set up to track remote branch %s.\n",
 414                        name, real_ref);
 415         }
 416
 417         if (config_repo)
 418                 free(config_repo);
 419         if (config_remote)
 420                 free(config_remote);
 421 }
 422
 423 static void create_branch(const char *name, const char *start_name,
 424                           int force, int reflog, int track)
 425 {
 426         struct ref_lock *lock;
 427         struct commit *commit;
 428         unsigned char sha1[20];
 429         char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
 430         int forcing = 0;
 431
 432         snprintf(ref, sizeof ref, "refs/heads/%s", name);
 433         if (check_ref_format(ref))
 434                 die("'%s' is not a valid branch name.", name);
 435
 436         if (resolve_ref(ref, sha1, 1, NULL)) {
 437                 if (!force)
 438                         die("A branch named '%s' already exists.", name);
 439                 else if (!is_bare_repository() && !strcmp(head, name))
 440                         die("Cannot force update the current branch.");
 441                 forcing = 1;
 442         }
 443
 444         real_ref = NULL;
 445         if (get_sha1(start_name, sha1))
 446                 die("Not a valid object name: '%s'.", start_name);
 447
 448         switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
 449         case 0:
 450                 /* Not branching from any existing branch */
 451                 real_ref = NULL;
 452                 break;
 453         case 1:
 454                 /* Unique completion -- good */
 455                 break;
 456         default:
 457                 die("Ambiguous object name: '%s'.", start_name);
 458                 break;
 459         }
 460
 461         if ((commit = lookup_commit_reference(sha1)) == NULL)
 462                 die("Not a valid branch point: '%s'.", start_name);
 463         hashcpy(sha1, commit->object.sha1);
 464
 465         lock = lock_any_ref_for_update(ref, NULL);
 466         if (!lock)
 467                 die("Failed to lock ref for update: %s.", strerror(errno));
 468
 469         if (reflog)
 470                 log_all_ref_updates = 1;
 471
 472         if (forcing)
 473                 snprintf(msg, sizeof msg, "branch: Reset from %s",
 474                          start_name);
 475         else
 476                 snprintf(msg, sizeof msg, "branch: Created from %s",
 477                          start_name);
 478
 479         /* When branching off a remote branch, set up so that git-pull
 480            automatically merges from there.  So far, this is only done for
 481            remotes registered via .git/config.  */
 482         if (real_ref && track)
 483                 set_branch_defaults(name, real_ref);
 484
 485         if (write_ref_sha1(lock, sha1, msg) < 0)
 486                 die("Failed to write ref: %s.", strerror(errno));
 487
 488         if (real_ref)
 489                 free(real_ref);
 490 }
 491
 492 static void rename_branch(const char *oldname, const char *newname, int force)
 493 {
 494         char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
 495         unsigned char sha1[20];
 496         char oldsection[PATH_MAX], newsection[PATH_MAX];
 497
 498         if (!oldname)
 499                 die("cannot rename the current branch while not on any.");
 500
 501         if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
 502                 die("Old branchname too long");
 503
 504         if (check_ref_format(oldref))
 505                 die("Invalid branch name: %s", oldref);
 506
 507         if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
 508                 die("New branchname too long");
 509
 510         if (check_ref_format(newref))
 511                 die("Invalid branch name: %s", newref);
 512
 513         if (resolve_ref(newref, sha1, 1, NULL) && !force)
 514                 die("A branch named '%s' already exists.", newname);
 515
 516         snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
 517                  oldref, newref);
 518
 519         if (rename_ref(oldref, newref, logmsg))
 520                 die("Branch rename failed");
 521
 522         /* no need to pass logmsg here as HEAD didn't really move */
 523         if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
 524                 die("Branch renamed to %s, but HEAD is not updated!", newname);
 525
 526         snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
 527         snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
 528         if (git_config_rename_section(oldsection, newsection) < 0)
 529                 die("Branch is renamed, but update of config-file failed");
 530 }
 531
 532 int cmd_branch(int argc, const char **argv, const char *prefix)
 533 {
 534         int delete = 0, force_delete = 0, force_create = 0;
 535         int rename = 0, force_rename = 0;
 536         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 537         int reflog = 0, track;
 538         int kinds = REF_LOCAL_BRANCH;
 539         int i;
 540
 541         git_config(git_branch_config);
 542         track = branch_track_remotes;
 543
 544         for (i = 1; i < argc; i++) {
 545                 const char *arg = argv[i];
 546
 547                 if (arg[0] != '-')
 548                         break;
 549                 if (!strcmp(arg, "--")) {
 550                         i++;
 551                         break;
 552                 }
 553                 if (!strcmp(arg, "--track")) {
 554                         track = 1;
 555                         continue;
 556                 }
 557                 if (!strcmp(arg, "--no-track")) {
 558                         track = 0;
 559                         continue;
 560                 }
 561                 if (!strcmp(arg, "-d")) {
 562                         delete = 1;
 563                         continue;
 564                 }
 565                 if (!strcmp(arg, "-D")) {
 566                         delete = 1;
 567                         force_delete = 1;
 568                         continue;
 569                 }
 570                 if (!strcmp(arg, "-f")) {
 571                         force_create = 1;
 572                         continue;
 573                 }
 574                 if (!strcmp(arg, "-m")) {
 575                         rename = 1;
 576                         continue;
 577                 }
 578                 if (!strcmp(arg, "-M")) {
 579                         rename = 1;
 580                         force_rename = 1;
 581                         continue;
 582                 }
 583                 if (!strcmp(arg, "-r")) {
 584                         kinds = REF_REMOTE_BRANCH;
 585                         continue;
 586                 }
 587                 if (!strcmp(arg, "-a")) {
 588                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 589                         continue;
 590                 }
 591                 if (!strcmp(arg, "-l")) {
 592                         reflog = 1;
 593                         continue;
 594                 }
 595                 if (!prefixcmp(arg, "--no-abbrev")) {
 596                         abbrev = 0;
 597                         continue;
 598                 }
 599                 if (!prefixcmp(arg, "--abbrev=")) {
 600                         abbrev = strtoul(arg + 9, NULL, 10);
 601                         if (abbrev < MINIMUM_ABBREV)
 602                                 abbrev = MINIMUM_ABBREV;
 603                         else if (abbrev > 40)
 604                                 abbrev = 40;
 605                         continue;
 606                 }
 607                 if (!strcmp(arg, "-v")) {
 608                         verbose = 1;
 609                         continue;
 610                 }
 611                 if (!strcmp(arg, "--color")) {
 612                         branch_use_color = 1;
 613                         continue;
 614                 }
 615                 if (!strcmp(arg, "--no-color")) {
 616                         branch_use_color = 0;
 617                         continue;
 618                 }
 619                 usage(builtin_branch_usage);
 620         }
 621
 622         if ((delete && rename) || (delete && force_create) ||
 623             (rename && force_create))
 624                 usage(builtin_branch_usage);
 625
 626         head = resolve_ref("HEAD", head_sha1, 0, NULL);
 627         if (!head)
 628                 die("Failed to resolve HEAD as a valid ref.");
 629         head = xstrdup(head);
 630         if (!strcmp(head, "HEAD")) {
 631                 detached = 1;
 632         }
 633         else {
 634                 if (prefixcmp(head, "refs/heads/"))
 635                         die("HEAD not found below refs/heads!");
 636                 head += 11;
 637         }
 638
 639         if (delete)
 640                 return delete_branches(argc - i, argv + i, force_delete, kinds);
 641         else if (i == argc)
 642                 print_ref_list(kinds, detached, verbose, abbrev);
 643         else if (rename && (i == argc - 1))
 644                 rename_branch(head, argv[i], force_rename);
 645         else if (rename && (i == argc - 2))
 646                 rename_branch(argv[i], argv[i + 1], force_rename);
 647         else if (i == argc - 1 || i == argc - 2)
 648                 create_branch(argv[i], (i == argc - 2) ? argv[i+1] : head,
 649                               force_create, reflog, track);
 650         else
 651                 usage(builtin_branch_usage);
 652
 653         return 0;
 654 }