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