git.oblomov.eu Git - git/blob - builtin/tag.c

   1 /*
   2  * Builtin "git tag"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *                    Carlos Rica <jasampler@gmail.com>
   6  * Based on git-tag.sh and mktag.c by Linus Torvalds.
   7  */
   8
   9 #include "cache.h"
  10 #include "builtin.h"
  11 #include "refs.h"
  12 #include "tag.h"
  13 #include "run-command.h"
  14 #include "parse-options.h"
  15 #include "diff.h"
  16 #include "revision.h"
  17 #include "gpg-interface.h"
  18 #include "sha1-array.h"
  19 #include "column.h"
  20
  21 static const char * const git_tag_usage[] = {
  22         N_("git tag [-a | -s | -u <key-id>] [-f] [-m <msg> | -F <file>] <tagname> [<head>]"),
  23         N_("git tag -d <tagname>..."),
  24         N_("git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>]"
  25                 "\n\t\t[<pattern>...]"),
  26         N_("git tag -v <tagname>..."),
  27         NULL
  28 };
  29
  30 #define STRCMP_SORT     0       /* must be zero */
  31 #define VERCMP_SORT     1
  32 #define SORT_MASK       0x7fff
  33 #define REVERSE_SORT    0x8000
  34
  35 static int tag_sort;
  36
  37 struct tag_filter {
  38         const char **patterns;
  39         int lines;
  40         int sort;
  41         struct string_list tags;
  42         struct commit_list *with_commit;
  43 };
  44
  45 static struct sha1_array points_at;
  46 static unsigned int colopts;
  47
  48 static int match_pattern(const char **patterns, const char *ref)
  49 {
  50         /* no pattern means match everything */
  51         if (!*patterns)
  52                 return 1;
  53         for (; *patterns; patterns++)
  54                 if (!wildmatch(*patterns, ref, 0, NULL))
  55                         return 1;
  56         return 0;
  57 }
  58
  59 /*
  60  * This is currently duplicated in ref-filter.c, and will eventually be
  61  * removed as we port tag.c to use the ref-filter APIs.
  62  */
  63 static const unsigned char *match_points_at(const char *refname,
  64                                             const unsigned char *sha1)
  65 {
  66         const unsigned char *tagged_sha1 = NULL;
  67         struct object *obj;
  68
  69         if (sha1_array_lookup(&points_at, sha1) >= 0)
  70                 return sha1;
  71         obj = parse_object(sha1);
  72         if (!obj)
  73                 die(_("malformed object at '%s'"), refname);
  74         if (obj->type == OBJ_TAG)
  75                 tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
  76         if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
  77                 return tagged_sha1;
  78         return NULL;
  79 }
  80
  81 static int in_commit_list(const struct commit_list *want, struct commit *c)
  82 {
  83         for (; want; want = want->next)
  84                 if (!hashcmp(want->item->object.sha1, c->object.sha1))
  85                         return 1;
  86         return 0;
  87 }
  88
  89 enum contains_result {
  90         CONTAINS_UNKNOWN = -1,
  91         CONTAINS_NO = 0,
  92         CONTAINS_YES = 1
  93 };
  94
  95 /*
  96  * Test whether the candidate or one of its parents is contained in the list.
  97  * Do not recurse to find out, though, but return -1 if inconclusive.
  98  */
  99 static enum contains_result contains_test(struct commit *candidate,
 100                             const struct commit_list *want)
 101 {
 102         /* was it previously marked as containing a want commit? */
 103         if (candidate->object.flags & TMP_MARK)
 104                 return 1;
 105         /* or marked as not possibly containing a want commit? */
 106         if (candidate->object.flags & UNINTERESTING)
 107                 return 0;
 108         /* or are we it? */
 109         if (in_commit_list(want, candidate)) {
 110                 candidate->object.flags |= TMP_MARK;
 111                 return 1;
 112         }
 113
 114         if (parse_commit(candidate) < 0)
 115                 return 0;
 116
 117         return -1;
 118 }
 119
 120 /*
 121  * Mimicking the real stack, this stack lives on the heap, avoiding stack
 122  * overflows.
 123  *
 124  * At each recursion step, the stack items points to the commits whose
 125  * ancestors are to be inspected.
 126  */
 127 struct stack {
 128         int nr, alloc;
 129         struct stack_entry {
 130                 struct commit *commit;
 131                 struct commit_list *parents;
 132         } *stack;
 133 };
 134
 135 static void push_to_stack(struct commit *candidate, struct stack *stack)
 136 {
 137         int index = stack->nr++;
 138         ALLOC_GROW(stack->stack, stack->nr, stack->alloc);
 139         stack->stack[index].commit = candidate;
 140         stack->stack[index].parents = candidate->parents;
 141 }
 142
 143 static enum contains_result contains(struct commit *candidate,
 144                 const struct commit_list *want)
 145 {
 146         struct stack stack = { 0, 0, NULL };
 147         int result = contains_test(candidate, want);
 148
 149         if (result != CONTAINS_UNKNOWN)
 150                 return result;
 151
 152         push_to_stack(candidate, &stack);
 153         while (stack.nr) {
 154                 struct stack_entry *entry = &stack.stack[stack.nr - 1];
 155                 struct commit *commit = entry->commit;
 156                 struct commit_list *parents = entry->parents;
 157
 158                 if (!parents) {
 159                         commit->object.flags |= UNINTERESTING;
 160                         stack.nr--;
 161                 }
 162                 /*
 163                  * If we just popped the stack, parents->item has been marked,
 164                  * therefore contains_test will return a meaningful 0 or 1.
 165                  */
 166                 else switch (contains_test(parents->item, want)) {
 167                 case CONTAINS_YES:
 168                         commit->object.flags |= TMP_MARK;
 169                         stack.nr--;
 170                         break;
 171                 case CONTAINS_NO:
 172                         entry->parents = parents->next;
 173                         break;
 174                 case CONTAINS_UNKNOWN:
 175                         push_to_stack(parents->item, &stack);
 176                         break;
 177                 }
 178         }
 179         free(stack.stack);
 180         return contains_test(candidate, want);
 181 }
 182
 183 static void show_tag_lines(const struct object_id *oid, int lines)
 184 {
 185         int i;
 186         unsigned long size;
 187         enum object_type type;
 188         char *buf, *sp, *eol;
 189         size_t len;
 190
 191         buf = read_sha1_file(oid->hash, &type, &size);
 192         if (!buf)
 193                 die_errno("unable to read object %s", oid_to_hex(oid));
 194         if (type != OBJ_COMMIT && type != OBJ_TAG)
 195                 goto free_return;
 196         if (!size)
 197                 die("an empty %s object %s?",
 198                     typename(type), oid_to_hex(oid));
 199
 200         /* skip header */
 201         sp = strstr(buf, "\n\n");
 202         if (!sp)
 203                 goto free_return;
 204
 205         /* only take up to "lines" lines, and strip the signature from a tag */
 206         if (type == OBJ_TAG)
 207                 size = parse_signature(buf, size);
 208         for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
 209                 if (i)
 210                         printf("\n    ");
 211                 eol = memchr(sp, '\n', size - (sp - buf));
 212                 len = eol ? eol - sp : size - (sp - buf);
 213                 fwrite(sp, len, 1, stdout);
 214                 if (!eol)
 215                         break;
 216                 sp = eol + 1;
 217         }
 218 free_return:
 219         free(buf);
 220 }
 221
 222 static int show_reference(const char *refname, const struct object_id *oid,
 223                           int flag, void *cb_data)
 224 {
 225         struct tag_filter *filter = cb_data;
 226
 227         if (match_pattern(filter->patterns, refname)) {
 228                 if (filter->with_commit) {
 229                         struct commit *commit;
 230
 231                         commit = lookup_commit_reference_gently(oid->hash, 1);
 232                         if (!commit)
 233                                 return 0;
 234                         if (!contains(commit, filter->with_commit))
 235                                 return 0;
 236                 }
 237
 238                 if (points_at.nr && !match_points_at(refname, oid->hash))
 239                         return 0;
 240
 241                 if (!filter->lines) {
 242                         if (filter->sort)
 243                                 string_list_append(&filter->tags, refname);
 244                         else
 245                                 printf("%s\n", refname);
 246                         return 0;
 247                 }
 248                 printf("%-15s ", refname);
 249                 show_tag_lines(oid, filter->lines);
 250                 putchar('\n');
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int sort_by_version(const void *a_, const void *b_)
 257 {
 258         const struct string_list_item *a = a_;
 259         const struct string_list_item *b = b_;
 260         return versioncmp(a->string, b->string);
 261 }
 262
 263 static int list_tags(const char **patterns, int lines,
 264                      struct commit_list *with_commit, int sort)
 265 {
 266         struct tag_filter filter;
 267
 268         filter.patterns = patterns;
 269         filter.lines = lines;
 270         filter.sort = sort;
 271         filter.with_commit = with_commit;
 272         memset(&filter.tags, 0, sizeof(filter.tags));
 273         filter.tags.strdup_strings = 1;
 274
 275         for_each_tag_ref(show_reference, (void *)&filter);
 276         if (sort) {
 277                 int i;
 278                 if ((sort & SORT_MASK) == VERCMP_SORT)
 279                         qsort(filter.tags.items, filter.tags.nr,
 280                               sizeof(struct string_list_item), sort_by_version);
 281                 if (sort & REVERSE_SORT)
 282                         for (i = filter.tags.nr - 1; i >= 0; i--)
 283                                 printf("%s\n", filter.tags.items[i].string);
 284                 else
 285                         for (i = 0; i < filter.tags.nr; i++)
 286                                 printf("%s\n", filter.tags.items[i].string);
 287                 string_list_clear(&filter.tags, 0);
 288         }
 289         return 0;
 290 }
 291
 292 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 293                                 const unsigned char *sha1);
 294
 295 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 296 {
 297         const char **p;
 298         char ref[PATH_MAX];
 299         int had_error = 0;
 300         unsigned char sha1[20];
 301
 302         for (p = argv; *p; p++) {
 303                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 304                                         >= sizeof(ref)) {
 305                         error(_("tag name too long: %.*s..."), 50, *p);
 306                         had_error = 1;
 307                         continue;
 308                 }
 309                 if (read_ref(ref, sha1)) {
 310                         error(_("tag '%s' not found."), *p);
 311                         had_error = 1;
 312                         continue;
 313                 }
 314                 if (fn(*p, ref, sha1))
 315                         had_error = 1;
 316         }
 317         return had_error;
 318 }
 319
 320 static int delete_tag(const char *name, const char *ref,
 321                                 const unsigned char *sha1)
 322 {
 323         if (delete_ref(ref, sha1, 0))
 324                 return 1;
 325         printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 326         return 0;
 327 }
 328
 329 static int verify_tag(const char *name, const char *ref,
 330                                 const unsigned char *sha1)
 331 {
 332         const char *argv_verify_tag[] = {"verify-tag",
 333                                         "-v", "SHA1_HEX", NULL};
 334         argv_verify_tag[2] = sha1_to_hex(sha1);
 335
 336         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 337                 return error(_("could not verify the tag '%s'"), name);
 338         return 0;
 339 }
 340
 341 static int do_sign(struct strbuf *buffer)
 342 {
 343         return sign_buffer(buffer, buffer, get_signing_key());
 344 }
 345
 346 static const char tag_template[] =
 347         N_("\nWrite a message for tag:\n  %s\n"
 348         "Lines starting with '%c' will be ignored.\n");
 349
 350 static const char tag_template_nocleanup[] =
 351         N_("\nWrite a message for tag:\n  %s\n"
 352         "Lines starting with '%c' will be kept; you may remove them"
 353         " yourself if you want to.\n");
 354
 355 /*
 356  * Parse a sort string, and return 0 if parsed successfully. Will return
 357  * non-zero when the sort string does not parse into a known type. If var is
 358  * given, the error message becomes a warning and includes information about
 359  * the configuration value.
 360  */
 361 static int parse_sort_string(const char *var, const char *arg, int *sort)
 362 {
 363         int type = 0, flags = 0;
 364
 365         if (skip_prefix(arg, "-", &arg))
 366                 flags |= REVERSE_SORT;
 367
 368         if (skip_prefix(arg, "version:", &arg) || skip_prefix(arg, "v:", &arg))
 369                 type = VERCMP_SORT;
 370         else
 371                 type = STRCMP_SORT;
 372
 373         if (strcmp(arg, "refname")) {
 374                 if (!var)
 375                         return error(_("unsupported sort specification '%s'"), arg);
 376                 else {
 377                         warning(_("unsupported sort specification '%s' in variable '%s'"),
 378                                 var, arg);
 379                         return -1;
 380                 }
 381         }
 382
 383         *sort = (type | flags);
 384
 385         return 0;
 386 }
 387
 388 static int git_tag_config(const char *var, const char *value, void *cb)
 389 {
 390         int status;
 391
 392         if (!strcmp(var, "tag.sort")) {
 393                 if (!value)
 394                         return config_error_nonbool(var);
 395                 parse_sort_string(var, value, &tag_sort);
 396                 return 0;
 397         }
 398
 399         status = git_gpg_config(var, value, cb);
 400         if (status)
 401                 return status;
 402         if (starts_with(var, "column."))
 403                 return git_column_config(var, value, "tag", &colopts);
 404         return git_default_config(var, value, cb);
 405 }
 406
 407 static void write_tag_body(int fd, const unsigned char *sha1)
 408 {
 409         unsigned long size;
 410         enum object_type type;
 411         char *buf, *sp;
 412
 413         buf = read_sha1_file(sha1, &type, &size);
 414         if (!buf)
 415                 return;
 416         /* skip header */
 417         sp = strstr(buf, "\n\n");
 418
 419         if (!sp || !size || type != OBJ_TAG) {
 420                 free(buf);
 421                 return;
 422         }
 423         sp += 2; /* skip the 2 LFs */
 424         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 425
 426         free(buf);
 427 }
 428
 429 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 430 {
 431         if (sign && do_sign(buf) < 0)
 432                 return error(_("unable to sign the tag"));
 433         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 434                 return error(_("unable to write tag file"));
 435         return 0;
 436 }
 437
 438 struct create_tag_options {
 439         unsigned int message_given:1;
 440         unsigned int sign;
 441         enum {
 442                 CLEANUP_NONE,
 443                 CLEANUP_SPACE,
 444                 CLEANUP_ALL
 445         } cleanup_mode;
 446 };
 447
 448 static void create_tag(const unsigned char *object, const char *tag,
 449                        struct strbuf *buf, struct create_tag_options *opt,
 450                        unsigned char *prev, unsigned char *result)
 451 {
 452         enum object_type type;
 453         char header_buf[1024];
 454         int header_len;
 455         char *path = NULL;
 456
 457         type = sha1_object_info(object, NULL);
 458         if (type <= OBJ_NONE)
 459             die(_("bad object type."));
 460
 461         header_len = snprintf(header_buf, sizeof(header_buf),
 462                           "object %s\n"
 463                           "type %s\n"
 464                           "tag %s\n"
 465                           "tagger %s\n\n",
 466                           sha1_to_hex(object),
 467                           typename(type),
 468                           tag,
 469                           git_committer_info(IDENT_STRICT));
 470
 471         if (header_len > sizeof(header_buf) - 1)
 472                 die(_("tag header too big."));
 473
 474         if (!opt->message_given) {
 475                 int fd;
 476
 477                 /* write the template message before editing: */
 478                 path = git_pathdup("TAG_EDITMSG");
 479                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 480                 if (fd < 0)
 481                         die_errno(_("could not create file '%s'"), path);
 482
 483                 if (!is_null_sha1(prev)) {
 484                         write_tag_body(fd, prev);
 485                 } else {
 486                         struct strbuf buf = STRBUF_INIT;
 487                         strbuf_addch(&buf, '\n');
 488                         if (opt->cleanup_mode == CLEANUP_ALL)
 489                                 strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
 490                         else
 491                                 strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
 492                         write_or_die(fd, buf.buf, buf.len);
 493                         strbuf_release(&buf);
 494                 }
 495                 close(fd);
 496
 497                 if (launch_editor(path, buf, NULL)) {
 498                         fprintf(stderr,
 499                         _("Please supply the message using either -m or -F option.\n"));
 500                         exit(1);
 501                 }
 502         }
 503
 504         if (opt->cleanup_mode != CLEANUP_NONE)
 505                 stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 506
 507         if (!opt->message_given && !buf->len)
 508                 die(_("no tag message?"));
 509
 510         strbuf_insert(buf, 0, header_buf, header_len);
 511
 512         if (build_tag_object(buf, opt->sign, result) < 0) {
 513                 if (path)
 514                         fprintf(stderr, _("The tag message has been left in %s\n"),
 515                                 path);
 516                 exit(128);
 517         }
 518         if (path) {
 519                 unlink_or_warn(path);
 520                 free(path);
 521         }
 522 }
 523
 524 struct msg_arg {
 525         int given;
 526         struct strbuf buf;
 527 };
 528
 529 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 530 {
 531         struct msg_arg *msg = opt->value;
 532
 533         if (!arg)
 534                 return -1;
 535         if (msg->buf.len)
 536                 strbuf_addstr(&(msg->buf), "\n\n");
 537         strbuf_addstr(&(msg->buf), arg);
 538         msg->given = 1;
 539         return 0;
 540 }
 541
 542 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 543 {
 544         if (name[0] == '-')
 545                 return -1;
 546
 547         strbuf_reset(sb);
 548         strbuf_addf(sb, "refs/tags/%s", name);
 549
 550         return check_refname_format(sb->buf, 0);
 551 }
 552
 553 static int parse_opt_sort(const struct option *opt, const char *arg, int unset)
 554 {
 555         int *sort = opt->value;
 556
 557         return parse_sort_string(NULL, arg, sort);
 558 }
 559
 560 int cmd_tag(int argc, const char **argv, const char *prefix)
 561 {
 562         struct strbuf buf = STRBUF_INIT;
 563         struct strbuf ref = STRBUF_INIT;
 564         unsigned char object[20], prev[20];
 565         const char *object_ref, *tag;
 566         struct create_tag_options opt;
 567         char *cleanup_arg = NULL;
 568         int annotate = 0, force = 0, lines = -1;
 569         int cmdmode = 0;
 570         const char *msgfile = NULL, *keyid = NULL;
 571         struct msg_arg msg = { 0, STRBUF_INIT };
 572         struct commit_list *with_commit = NULL;
 573         struct ref_transaction *transaction;
 574         struct strbuf err = STRBUF_INIT;
 575         struct option options[] = {
 576                 OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 577                 { OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
 578                                 N_("print <n> lines of each tag message"),
 579                                 PARSE_OPT_OPTARG, NULL, 1 },
 580                 OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 581                 OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 582
 583                 OPT_GROUP(N_("Tag creation options")),
 584                 OPT_BOOL('a', "annotate", &annotate,
 585                                         N_("annotated tag, needs a message")),
 586                 OPT_CALLBACK('m', "message", &msg, N_("message"),
 587                              N_("tag message"), parse_msg_arg),
 588                 OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 589                 OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 590                 OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 591                         N_("how to strip spaces and #comments from message")),
 592                 OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 593                                         N_("use another key to sign the tag")),
 594                 OPT__FORCE(&force, N_("replace the tag if exists")),
 595
 596                 OPT_GROUP(N_("Tag listing options")),
 597                 OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 598                 {
 599                         OPTION_CALLBACK, 0, "sort", &tag_sort, N_("type"), N_("sort tags"),
 600                         PARSE_OPT_NONEG, parse_opt_sort
 601                 },
 602                 {
 603                         OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
 604                         N_("print only tags that contain the commit"),
 605                         PARSE_OPT_LASTARG_DEFAULT,
 606                         parse_opt_with_commit, (intptr_t)"HEAD",
 607                 },
 608                 {
 609                         OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
 610                         N_("print only tags that contain the commit"),
 611                         PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
 612                         parse_opt_with_commit, (intptr_t)"HEAD",
 613                 },
 614                 {
 615                         OPTION_CALLBACK, 0, "points-at", &points_at, N_("object"),
 616                         N_("print only tags of the object"), 0, parse_opt_object_name
 617                 },
 618                 OPT_END()
 619         };
 620
 621         git_config(git_tag_config, NULL);
 622
 623         memset(&opt, 0, sizeof(opt));
 624
 625         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 626
 627         if (keyid) {
 628                 opt.sign = 1;
 629                 set_signing_key(keyid);
 630         }
 631         if (opt.sign)
 632                 annotate = 1;
 633         if (argc == 0 && !cmdmode)
 634                 cmdmode = 'l';
 635
 636         if ((annotate || msg.given || msgfile || force) && (cmdmode != 0))
 637                 usage_with_options(git_tag_usage, options);
 638
 639         finalize_colopts(&colopts, -1);
 640         if (cmdmode == 'l' && lines != -1) {
 641                 if (explicitly_enable_column(colopts))
 642                         die(_("--column and -n are incompatible"));
 643                 colopts = 0;
 644         }
 645         if (cmdmode == 'l') {
 646                 int ret;
 647                 if (column_active(colopts)) {
 648                         struct column_options copts;
 649                         memset(&copts, 0, sizeof(copts));
 650                         copts.padding = 2;
 651                         run_column_filter(colopts, &copts);
 652                 }
 653                 if (lines != -1 && tag_sort)
 654                         die(_("--sort and -n are incompatible"));
 655                 ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit, tag_sort);
 656                 if (column_active(colopts))
 657                         stop_column_filter();
 658                 return ret;
 659         }
 660         if (lines != -1)
 661                 die(_("-n option is only allowed with -l."));
 662         if (with_commit)
 663                 die(_("--contains option is only allowed with -l."));
 664         if (points_at.nr)
 665                 die(_("--points-at option is only allowed with -l."));
 666         if (cmdmode == 'd')
 667                 return for_each_tag_name(argv, delete_tag);
 668         if (cmdmode == 'v')
 669                 return for_each_tag_name(argv, verify_tag);
 670
 671         if (msg.given || msgfile) {
 672                 if (msg.given && msgfile)
 673                         die(_("only one -F or -m option is allowed."));
 674                 annotate = 1;
 675                 if (msg.given)
 676                         strbuf_addbuf(&buf, &(msg.buf));
 677                 else {
 678                         if (!strcmp(msgfile, "-")) {
 679                                 if (strbuf_read(&buf, 0, 1024) < 0)
 680                                         die_errno(_("cannot read '%s'"), msgfile);
 681                         } else {
 682                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 683                                         die_errno(_("could not open or read '%s'"),
 684                                                 msgfile);
 685                         }
 686                 }
 687         }
 688
 689         tag = argv[0];
 690
 691         object_ref = argc == 2 ? argv[1] : "HEAD";
 692         if (argc > 2)
 693                 die(_("too many params"));
 694
 695         if (get_sha1(object_ref, object))
 696                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 697
 698         if (strbuf_check_tag_ref(&ref, tag))
 699                 die(_("'%s' is not a valid tag name."), tag);
 700
 701         if (read_ref(ref.buf, prev))
 702                 hashclr(prev);
 703         else if (!force)
 704                 die(_("tag '%s' already exists"), tag);
 705
 706         opt.message_given = msg.given || msgfile;
 707
 708         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 709                 opt.cleanup_mode = CLEANUP_ALL;
 710         else if (!strcmp(cleanup_arg, "verbatim"))
 711                 opt.cleanup_mode = CLEANUP_NONE;
 712         else if (!strcmp(cleanup_arg, "whitespace"))
 713                 opt.cleanup_mode = CLEANUP_SPACE;
 714         else
 715                 die(_("Invalid cleanup mode %s"), cleanup_arg);
 716
 717         if (annotate)
 718                 create_tag(object, tag, &buf, &opt, prev, object);
 719
 720         transaction = ref_transaction_begin(&err);
 721         if (!transaction ||
 722             ref_transaction_update(transaction, ref.buf, object, prev,
 723                                    0, NULL, &err) ||
 724             ref_transaction_commit(transaction, &err))
 725                 die("%s", err.buf);
 726         ref_transaction_free(transaction);
 727         if (force && !is_null_sha1(prev) && hashcmp(prev, object))
 728                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 729
 730         strbuf_release(&err);
 731         strbuf_release(&buf);
 732         strbuf_release(&ref);
 733         return 0;
 734 }