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 static const unsigned char *match_points_at(const char *refname,
  60                                             const unsigned char *sha1)
  61 {
  62         const unsigned char *tagged_sha1 = NULL;
  63         struct object *obj;
  64
  65         if (sha1_array_lookup(&points_at, sha1) >= 0)
  66                 return sha1;
  67         obj = parse_object(sha1);
  68         if (!obj)
  69                 die(_("malformed object at '%s'"), refname);
  70         if (obj->type == OBJ_TAG)
  71                 tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
  72         if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
  73                 return tagged_sha1;
  74         return NULL;
  75 }
  76
  77 static int in_commit_list(const struct commit_list *want, struct commit *c)
  78 {
  79         for (; want; want = want->next)
  80                 if (!hashcmp(want->item->object.sha1, c->object.sha1))
  81                         return 1;
  82         return 0;
  83 }
  84
  85 enum contains_result {
  86         CONTAINS_UNKNOWN = -1,
  87         CONTAINS_NO = 0,
  88         CONTAINS_YES = 1
  89 };
  90
  91 /*
  92  * Test whether the candidate or one of its parents is contained in the list.
  93  * Do not recurse to find out, though, but return -1 if inconclusive.
  94  */
  95 static enum contains_result contains_test(struct commit *candidate,
  96                             const struct commit_list *want)
  97 {
  98         /* was it previously marked as containing a want commit? */
  99         if (candidate->object.flags & TMP_MARK)
 100                 return 1;
 101         /* or marked as not possibly containing a want commit? */
 102         if (candidate->object.flags & UNINTERESTING)
 103                 return 0;
 104         /* or are we it? */
 105         if (in_commit_list(want, candidate)) {
 106                 candidate->object.flags |= TMP_MARK;
 107                 return 1;
 108         }
 109
 110         if (parse_commit(candidate) < 0)
 111                 return 0;
 112
 113         return -1;
 114 }
 115
 116 /*
 117  * Mimicking the real stack, this stack lives on the heap, avoiding stack
 118  * overflows.
 119  *
 120  * At each recursion step, the stack items points to the commits whose
 121  * ancestors are to be inspected.
 122  */
 123 struct stack {
 124         int nr, alloc;
 125         struct stack_entry {
 126                 struct commit *commit;
 127                 struct commit_list *parents;
 128         } *stack;
 129 };
 130
 131 static void push_to_stack(struct commit *candidate, struct stack *stack)
 132 {
 133         int index = stack->nr++;
 134         ALLOC_GROW(stack->stack, stack->nr, stack->alloc);
 135         stack->stack[index].commit = candidate;
 136         stack->stack[index].parents = candidate->parents;
 137 }
 138
 139 static enum contains_result contains(struct commit *candidate,
 140                 const struct commit_list *want)
 141 {
 142         struct stack stack = { 0, 0, NULL };
 143         int result = contains_test(candidate, want);
 144
 145         if (result != CONTAINS_UNKNOWN)
 146                 return result;
 147
 148         push_to_stack(candidate, &stack);
 149         while (stack.nr) {
 150                 struct stack_entry *entry = &stack.stack[stack.nr - 1];
 151                 struct commit *commit = entry->commit;
 152                 struct commit_list *parents = entry->parents;
 153
 154                 if (!parents) {
 155                         commit->object.flags |= UNINTERESTING;
 156                         stack.nr--;
 157                 }
 158                 /*
 159                  * If we just popped the stack, parents->item has been marked,
 160                  * therefore contains_test will return a meaningful 0 or 1.
 161                  */
 162                 else switch (contains_test(parents->item, want)) {
 163                 case CONTAINS_YES:
 164                         commit->object.flags |= TMP_MARK;
 165                         stack.nr--;
 166                         break;
 167                 case CONTAINS_NO:
 168                         entry->parents = parents->next;
 169                         break;
 170                 case CONTAINS_UNKNOWN:
 171                         push_to_stack(parents->item, &stack);
 172                         break;
 173                 }
 174         }
 175         free(stack.stack);
 176         return contains_test(candidate, want);
 177 }
 178
 179 static void show_tag_lines(const struct object_id *oid, int lines)
 180 {
 181         int i;
 182         unsigned long size;
 183         enum object_type type;
 184         char *buf, *sp, *eol;
 185         size_t len;
 186
 187         buf = read_sha1_file(oid->hash, &type, &size);
 188         if (!buf)
 189                 die_errno("unable to read object %s", oid_to_hex(oid));
 190         if (type != OBJ_COMMIT && type != OBJ_TAG)
 191                 goto free_return;
 192         if (!size)
 193                 die("an empty %s object %s?",
 194                     typename(type), oid_to_hex(oid));
 195
 196         /* skip header */
 197         sp = strstr(buf, "\n\n");
 198         if (!sp)
 199                 goto free_return;
 200
 201         /* only take up to "lines" lines, and strip the signature from a tag */
 202         if (type == OBJ_TAG)
 203                 size = parse_signature(buf, size);
 204         for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
 205                 if (i)
 206                         printf("\n    ");
 207                 eol = memchr(sp, '\n', size - (sp - buf));
 208                 len = eol ? eol - sp : size - (sp - buf);
 209                 fwrite(sp, len, 1, stdout);
 210                 if (!eol)
 211                         break;
 212                 sp = eol + 1;
 213         }
 214 free_return:
 215         free(buf);
 216 }
 217
 218 static int show_reference(const char *refname, const struct object_id *oid,
 219                           int flag, void *cb_data)
 220 {
 221         struct tag_filter *filter = cb_data;
 222
 223         if (match_pattern(filter->patterns, refname)) {
 224                 if (filter->with_commit) {
 225                         struct commit *commit;
 226
 227                         commit = lookup_commit_reference_gently(oid->hash, 1);
 228                         if (!commit)
 229                                 return 0;
 230                         if (!contains(commit, filter->with_commit))
 231                                 return 0;
 232                 }
 233
 234                 if (points_at.nr && !match_points_at(refname, oid->hash))
 235                         return 0;
 236
 237                 if (!filter->lines) {
 238                         if (filter->sort)
 239                                 string_list_append(&filter->tags, refname);
 240                         else
 241                                 printf("%s\n", refname);
 242                         return 0;
 243                 }
 244                 printf("%-15s ", refname);
 245                 show_tag_lines(oid, filter->lines);
 246                 putchar('\n');
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int sort_by_version(const void *a_, const void *b_)
 253 {
 254         const struct string_list_item *a = a_;
 255         const struct string_list_item *b = b_;
 256         return versioncmp(a->string, b->string);
 257 }
 258
 259 static int list_tags(const char **patterns, int lines,
 260                      struct commit_list *with_commit, int sort)
 261 {
 262         struct tag_filter filter;
 263
 264         filter.patterns = patterns;
 265         filter.lines = lines;
 266         filter.sort = sort;
 267         filter.with_commit = with_commit;
 268         memset(&filter.tags, 0, sizeof(filter.tags));
 269         filter.tags.strdup_strings = 1;
 270
 271         for_each_tag_ref(show_reference, (void *)&filter);
 272         if (sort) {
 273                 int i;
 274                 if ((sort & SORT_MASK) == VERCMP_SORT)
 275                         qsort(filter.tags.items, filter.tags.nr,
 276                               sizeof(struct string_list_item), sort_by_version);
 277                 if (sort & REVERSE_SORT)
 278                         for (i = filter.tags.nr - 1; i >= 0; i--)
 279                                 printf("%s\n", filter.tags.items[i].string);
 280                 else
 281                         for (i = 0; i < filter.tags.nr; i++)
 282                                 printf("%s\n", filter.tags.items[i].string);
 283                 string_list_clear(&filter.tags, 0);
 284         }
 285         return 0;
 286 }
 287
 288 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 289                                 const unsigned char *sha1);
 290
 291 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 292 {
 293         const char **p;
 294         char ref[PATH_MAX];
 295         int had_error = 0;
 296         unsigned char sha1[20];
 297
 298         for (p = argv; *p; p++) {
 299                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 300                                         >= sizeof(ref)) {
 301                         error(_("tag name too long: %.*s..."), 50, *p);
 302                         had_error = 1;
 303                         continue;
 304                 }
 305                 if (read_ref(ref, sha1)) {
 306                         error(_("tag '%s' not found."), *p);
 307                         had_error = 1;
 308                         continue;
 309                 }
 310                 if (fn(*p, ref, sha1))
 311                         had_error = 1;
 312         }
 313         return had_error;
 314 }
 315
 316 static int delete_tag(const char *name, const char *ref,
 317                                 const unsigned char *sha1)
 318 {
 319         if (delete_ref(ref, sha1, 0))
 320                 return 1;
 321         printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 322         return 0;
 323 }
 324
 325 static int verify_tag(const char *name, const char *ref,
 326                                 const unsigned char *sha1)
 327 {
 328         const char *argv_verify_tag[] = {"verify-tag",
 329                                         "-v", "SHA1_HEX", NULL};
 330         argv_verify_tag[2] = sha1_to_hex(sha1);
 331
 332         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 333                 return error(_("could not verify the tag '%s'"), name);
 334         return 0;
 335 }
 336
 337 static int do_sign(struct strbuf *buffer)
 338 {
 339         return sign_buffer(buffer, buffer, get_signing_key());
 340 }
 341
 342 static const char tag_template[] =
 343         N_("\nWrite a message for tag:\n  %s\n"
 344         "Lines starting with '%c' will be ignored.\n");
 345
 346 static const char tag_template_nocleanup[] =
 347         N_("\nWrite a message for tag:\n  %s\n"
 348         "Lines starting with '%c' will be kept; you may remove them"
 349         " yourself if you want to.\n");
 350
 351 /*
 352  * Parse a sort string, and return 0 if parsed successfully. Will return
 353  * non-zero when the sort string does not parse into a known type. If var is
 354  * given, the error message becomes a warning and includes information about
 355  * the configuration value.
 356  */
 357 static int parse_sort_string(const char *var, const char *arg, int *sort)
 358 {
 359         int type = 0, flags = 0;
 360
 361         if (skip_prefix(arg, "-", &arg))
 362                 flags |= REVERSE_SORT;
 363
 364         if (skip_prefix(arg, "version:", &arg) || skip_prefix(arg, "v:", &arg))
 365                 type = VERCMP_SORT;
 366         else
 367                 type = STRCMP_SORT;
 368
 369         if (strcmp(arg, "refname")) {
 370                 if (!var)
 371                         return error(_("unsupported sort specification '%s'"), arg);
 372                 else {
 373                         warning(_("unsupported sort specification '%s' in variable '%s'"),
 374                                 var, arg);
 375                         return -1;
 376                 }
 377         }
 378
 379         *sort = (type | flags);
 380
 381         return 0;
 382 }
 383
 384 static int git_tag_config(const char *var, const char *value, void *cb)
 385 {
 386         int status;
 387
 388         if (!strcmp(var, "tag.sort")) {
 389                 if (!value)
 390                         return config_error_nonbool(var);
 391                 parse_sort_string(var, value, &tag_sort);
 392                 return 0;
 393         }
 394
 395         status = git_gpg_config(var, value, cb);
 396         if (status)
 397                 return status;
 398         if (starts_with(var, "column."))
 399                 return git_column_config(var, value, "tag", &colopts);
 400         return git_default_config(var, value, cb);
 401 }
 402
 403 static void write_tag_body(int fd, const unsigned char *sha1)
 404 {
 405         unsigned long size;
 406         enum object_type type;
 407         char *buf, *sp;
 408
 409         buf = read_sha1_file(sha1, &type, &size);
 410         if (!buf)
 411                 return;
 412         /* skip header */
 413         sp = strstr(buf, "\n\n");
 414
 415         if (!sp || !size || type != OBJ_TAG) {
 416                 free(buf);
 417                 return;
 418         }
 419         sp += 2; /* skip the 2 LFs */
 420         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 421
 422         free(buf);
 423 }
 424
 425 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 426 {
 427         if (sign && do_sign(buf) < 0)
 428                 return error(_("unable to sign the tag"));
 429         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 430                 return error(_("unable to write tag file"));
 431         return 0;
 432 }
 433
 434 struct create_tag_options {
 435         unsigned int message_given:1;
 436         unsigned int sign;
 437         enum {
 438                 CLEANUP_NONE,
 439                 CLEANUP_SPACE,
 440                 CLEANUP_ALL
 441         } cleanup_mode;
 442 };
 443
 444 static void create_tag(const unsigned char *object, const char *tag,
 445                        struct strbuf *buf, struct create_tag_options *opt,
 446                        unsigned char *prev, unsigned char *result)
 447 {
 448         enum object_type type;
 449         char header_buf[1024];
 450         int header_len;
 451         char *path = NULL;
 452
 453         type = sha1_object_info(object, NULL);
 454         if (type <= OBJ_NONE)
 455             die(_("bad object type."));
 456
 457         header_len = snprintf(header_buf, sizeof(header_buf),
 458                           "object %s\n"
 459                           "type %s\n"
 460                           "tag %s\n"
 461                           "tagger %s\n\n",
 462                           sha1_to_hex(object),
 463                           typename(type),
 464                           tag,
 465                           git_committer_info(IDENT_STRICT));
 466
 467         if (header_len > sizeof(header_buf) - 1)
 468                 die(_("tag header too big."));
 469
 470         if (!opt->message_given) {
 471                 int fd;
 472
 473                 /* write the template message before editing: */
 474                 path = git_pathdup("TAG_EDITMSG");
 475                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 476                 if (fd < 0)
 477                         die_errno(_("could not create file '%s'"), path);
 478
 479                 if (!is_null_sha1(prev)) {
 480                         write_tag_body(fd, prev);
 481                 } else {
 482                         struct strbuf buf = STRBUF_INIT;
 483                         strbuf_addch(&buf, '\n');
 484                         if (opt->cleanup_mode == CLEANUP_ALL)
 485                                 strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
 486                         else
 487                                 strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
 488                         write_or_die(fd, buf.buf, buf.len);
 489                         strbuf_release(&buf);
 490                 }
 491                 close(fd);
 492
 493                 if (launch_editor(path, buf, NULL)) {
 494                         fprintf(stderr,
 495                         _("Please supply the message using either -m or -F option.\n"));
 496                         exit(1);
 497                 }
 498         }
 499
 500         if (opt->cleanup_mode != CLEANUP_NONE)
 501                 stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 502
 503         if (!opt->message_given && !buf->len)
 504                 die(_("no tag message?"));
 505
 506         strbuf_insert(buf, 0, header_buf, header_len);
 507
 508         if (build_tag_object(buf, opt->sign, result) < 0) {
 509                 if (path)
 510                         fprintf(stderr, _("The tag message has been left in %s\n"),
 511                                 path);
 512                 exit(128);
 513         }
 514         if (path) {
 515                 unlink_or_warn(path);
 516                 free(path);
 517         }
 518 }
 519
 520 struct msg_arg {
 521         int given;
 522         struct strbuf buf;
 523 };
 524
 525 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 526 {
 527         struct msg_arg *msg = opt->value;
 528
 529         if (!arg)
 530                 return -1;
 531         if (msg->buf.len)
 532                 strbuf_addstr(&(msg->buf), "\n\n");
 533         strbuf_addstr(&(msg->buf), arg);
 534         msg->given = 1;
 535         return 0;
 536 }
 537
 538 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 539 {
 540         if (name[0] == '-')
 541                 return -1;
 542
 543         strbuf_reset(sb);
 544         strbuf_addf(sb, "refs/tags/%s", name);
 545
 546         return check_refname_format(sb->buf, 0);
 547 }
 548
 549 static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
 550                         const char *arg, int unset)
 551 {
 552         unsigned char sha1[20];
 553
 554         if (unset) {
 555                 sha1_array_clear(&points_at);
 556                 return 0;
 557         }
 558         if (!arg)
 559                 return error(_("switch 'points-at' requires an object"));
 560         if (get_sha1(arg, sha1))
 561                 return error(_("malformed object name '%s'"), arg);
 562         sha1_array_append(&points_at, sha1);
 563         return 0;
 564 }
 565
 566 static int parse_opt_sort(const struct option *opt, const char *arg, int unset)
 567 {
 568         int *sort = opt->value;
 569
 570         return parse_sort_string(NULL, arg, sort);
 571 }
 572
 573 int cmd_tag(int argc, const char **argv, const char *prefix)
 574 {
 575         struct strbuf buf = STRBUF_INIT;
 576         struct strbuf ref = STRBUF_INIT;
 577         unsigned char object[20], prev[20];
 578         const char *object_ref, *tag;
 579         struct create_tag_options opt;
 580         char *cleanup_arg = NULL;
 581         int annotate = 0, force = 0, lines = -1;
 582         int cmdmode = 0;
 583         const char *msgfile = NULL, *keyid = NULL;
 584         struct msg_arg msg = { 0, STRBUF_INIT };
 585         struct commit_list *with_commit = NULL;
 586         struct ref_transaction *transaction;
 587         struct strbuf err = STRBUF_INIT;
 588         struct option options[] = {
 589                 OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 590                 { OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
 591                                 N_("print <n> lines of each tag message"),
 592                                 PARSE_OPT_OPTARG, NULL, 1 },
 593                 OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 594                 OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 595
 596                 OPT_GROUP(N_("Tag creation options")),
 597                 OPT_BOOL('a', "annotate", &annotate,
 598                                         N_("annotated tag, needs a message")),
 599                 OPT_CALLBACK('m', "message", &msg, N_("message"),
 600                              N_("tag message"), parse_msg_arg),
 601                 OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 602                 OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 603                 OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 604                         N_("how to strip spaces and #comments from message")),
 605                 OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 606                                         N_("use another key to sign the tag")),
 607                 OPT__FORCE(&force, N_("replace the tag if exists")),
 608
 609                 OPT_GROUP(N_("Tag listing options")),
 610                 OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 611                 {
 612                         OPTION_CALLBACK, 0, "sort", &tag_sort, N_("type"), N_("sort tags"),
 613                         PARSE_OPT_NONEG, parse_opt_sort
 614                 },
 615                 {
 616                         OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
 617                         N_("print only tags that contain the commit"),
 618                         PARSE_OPT_LASTARG_DEFAULT,
 619                         parse_opt_with_commit, (intptr_t)"HEAD",
 620                 },
 621                 {
 622                         OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
 623                         N_("print only tags that contain the commit"),
 624                         PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
 625                         parse_opt_with_commit, (intptr_t)"HEAD",
 626                 },
 627                 {
 628                         OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
 629                         N_("print only tags of the object"), 0, parse_opt_points_at
 630                 },
 631                 OPT_END()
 632         };
 633
 634         git_config(git_tag_config, NULL);
 635
 636         memset(&opt, 0, sizeof(opt));
 637
 638         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 639
 640         if (keyid) {
 641                 opt.sign = 1;
 642                 set_signing_key(keyid);
 643         }
 644         if (opt.sign)
 645                 annotate = 1;
 646         if (argc == 0 && !cmdmode)
 647                 cmdmode = 'l';
 648
 649         if ((annotate || msg.given || msgfile || force) && (cmdmode != 0))
 650                 usage_with_options(git_tag_usage, options);
 651
 652         finalize_colopts(&colopts, -1);
 653         if (cmdmode == 'l' && lines != -1) {
 654                 if (explicitly_enable_column(colopts))
 655                         die(_("--column and -n are incompatible"));
 656                 colopts = 0;
 657         }
 658         if (cmdmode == 'l') {
 659                 int ret;
 660                 if (column_active(colopts)) {
 661                         struct column_options copts;
 662                         memset(&copts, 0, sizeof(copts));
 663                         copts.padding = 2;
 664                         run_column_filter(colopts, &copts);
 665                 }
 666                 if (lines != -1 && tag_sort)
 667                         die(_("--sort and -n are incompatible"));
 668                 ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit, tag_sort);
 669                 if (column_active(colopts))
 670                         stop_column_filter();
 671                 return ret;
 672         }
 673         if (lines != -1)
 674                 die(_("-n option is only allowed with -l."));
 675         if (with_commit)
 676                 die(_("--contains option is only allowed with -l."));
 677         if (points_at.nr)
 678                 die(_("--points-at option is only allowed with -l."));
 679         if (cmdmode == 'd')
 680                 return for_each_tag_name(argv, delete_tag);
 681         if (cmdmode == 'v')
 682                 return for_each_tag_name(argv, verify_tag);
 683
 684         if (msg.given || msgfile) {
 685                 if (msg.given && msgfile)
 686                         die(_("only one -F or -m option is allowed."));
 687                 annotate = 1;
 688                 if (msg.given)
 689                         strbuf_addbuf(&buf, &(msg.buf));
 690                 else {
 691                         if (!strcmp(msgfile, "-")) {
 692                                 if (strbuf_read(&buf, 0, 1024) < 0)
 693                                         die_errno(_("cannot read '%s'"), msgfile);
 694                         } else {
 695                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 696                                         die_errno(_("could not open or read '%s'"),
 697                                                 msgfile);
 698                         }
 699                 }
 700         }
 701
 702         tag = argv[0];
 703
 704         object_ref = argc == 2 ? argv[1] : "HEAD";
 705         if (argc > 2)
 706                 die(_("too many params"));
 707
 708         if (get_sha1(object_ref, object))
 709                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 710
 711         if (strbuf_check_tag_ref(&ref, tag))
 712                 die(_("'%s' is not a valid tag name."), tag);
 713
 714         if (read_ref(ref.buf, prev))
 715                 hashclr(prev);
 716         else if (!force)
 717                 die(_("tag '%s' already exists"), tag);
 718
 719         opt.message_given = msg.given || msgfile;
 720
 721         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 722                 opt.cleanup_mode = CLEANUP_ALL;
 723         else if (!strcmp(cleanup_arg, "verbatim"))
 724                 opt.cleanup_mode = CLEANUP_NONE;
 725         else if (!strcmp(cleanup_arg, "whitespace"))
 726                 opt.cleanup_mode = CLEANUP_SPACE;
 727         else
 728                 die(_("Invalid cleanup mode %s"), cleanup_arg);
 729
 730         if (annotate)
 731                 create_tag(object, tag, &buf, &opt, prev, object);
 732
 733         transaction = ref_transaction_begin(&err);
 734         if (!transaction ||
 735             ref_transaction_update(transaction, ref.buf, object, prev,
 736                                    0, NULL, &err) ||
 737             ref_transaction_commit(transaction, &err))
 738                 die("%s", err.buf);
 739         ref_transaction_free(transaction);
 740         if (force && !is_null_sha1(prev) && hashcmp(prev, object))
 741                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 742
 743         strbuf_release(&err);
 744         strbuf_release(&buf);
 745         strbuf_release(&ref);
 746         return 0;
 747 }