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 "config.h"
  11 #include "builtin.h"
  12 #include "environment.h"
  13 #include "gettext.h"
  14 #include "hex.h"
  15 #include "refs.h"
  16 #include "object-store.h"
  17 #include "tag.h"
  18 #include "run-command.h"
  19 #include "parse-options.h"
  20 #include "diff.h"
  21 #include "revision.h"
  22 #include "gpg-interface.h"
  23 #include "oid-array.h"
  24 #include "column.h"
  25 #include "ref-filter.h"
  26 #include "date.h"
  27 #include "write-or-die.h"
  28
  29 static const char * const git_tag_usage[] = {
  30         N_("git tag [-a | -s | -u <key-id>] [-f] [-m <msg> | -F <file>] [-e]\n"
  31            "        <tagname> [<commit> | <object>]"),
  32         N_("git tag -d <tagname>..."),
  33         N_("git tag [-n[<num>]] -l [--contains <commit>] [--no-contains <commit>]\n"
  34            "        [--points-at <object>] [--column[=<options>] | --no-column]\n"
  35            "        [--create-reflog] [--sort=<key>] [--format=<format>]\n"
  36            "        [--merged <commit>] [--no-merged <commit>] [<pattern>...]"),
  37         N_("git tag -v [--format=<format>] <tagname>..."),
  38         NULL
  39 };
  40
  41 static unsigned int colopts;
  42 static int force_sign_annotate;
  43 static int config_sign_tag = -1; /* unspecified */
  44 static int omit_empty = 0;
  45
  46 static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting,
  47                      struct ref_format *format)
  48 {
  49         struct ref_array array;
  50         struct strbuf output = STRBUF_INIT;
  51         struct strbuf err = STRBUF_INIT;
  52         char *to_free = NULL;
  53         int i;
  54
  55         memset(&array, 0, sizeof(array));
  56
  57         if (filter->lines == -1)
  58                 filter->lines = 0;
  59
  60         if (!format->format) {
  61                 if (filter->lines) {
  62                         to_free = xstrfmt("%s %%(contents:lines=%d)",
  63                                           "%(align:15)%(refname:lstrip=2)%(end)",
  64                                           filter->lines);
  65                         format->format = to_free;
  66                 } else
  67                         format->format = "%(refname:lstrip=2)";
  68         }
  69
  70         if (verify_ref_format(format))
  71                 die(_("unable to parse format string"));
  72         filter->with_commit_tag_algo = 1;
  73         filter_refs(&array, filter, FILTER_REFS_TAGS);
  74         filter_ahead_behind(the_repository, format, &array);
  75         ref_array_sort(sorting, &array);
  76
  77         for (i = 0; i < array.nr; i++) {
  78                 strbuf_reset(&output);
  79                 strbuf_reset(&err);
  80                 if (format_ref_array_item(array.items[i], format, &output, &err))
  81                         die("%s", err.buf);
  82                 fwrite(output.buf, 1, output.len, stdout);
  83                 if (output.len || !omit_empty)
  84                         putchar('\n');
  85         }
  86
  87         strbuf_release(&err);
  88         strbuf_release(&output);
  89         ref_array_clear(&array);
  90         free(to_free);
  91
  92         return 0;
  93 }
  94
  95 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
  96                                 const struct object_id *oid, void *cb_data);
  97
  98 static int for_each_tag_name(const char **argv, each_tag_name_fn fn,
  99                              void *cb_data)
 100 {
 101         const char **p;
 102         struct strbuf ref = STRBUF_INIT;
 103         int had_error = 0;
 104         struct object_id oid;
 105
 106         for (p = argv; *p; p++) {
 107                 strbuf_reset(&ref);
 108                 strbuf_addf(&ref, "refs/tags/%s", *p);
 109                 if (read_ref(ref.buf, &oid)) {
 110                         error(_("tag '%s' not found."), *p);
 111                         had_error = 1;
 112                         continue;
 113                 }
 114                 if (fn(*p, ref.buf, &oid, cb_data))
 115                         had_error = 1;
 116         }
 117         strbuf_release(&ref);
 118         return had_error;
 119 }
 120
 121 static int collect_tags(const char *name, const char *ref,
 122                         const struct object_id *oid, void *cb_data)
 123 {
 124         struct string_list *ref_list = cb_data;
 125
 126         string_list_append(ref_list, ref);
 127         ref_list->items[ref_list->nr - 1].util = oiddup(oid);
 128         return 0;
 129 }
 130
 131 static int delete_tags(const char **argv)
 132 {
 133         int result;
 134         struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
 135         struct string_list_item *item;
 136
 137         result = for_each_tag_name(argv, collect_tags, (void *)&refs_to_delete);
 138         if (delete_refs(NULL, &refs_to_delete, REF_NO_DEREF))
 139                 result = 1;
 140
 141         for_each_string_list_item(item, &refs_to_delete) {
 142                 const char *name = item->string;
 143                 struct object_id *oid = item->util;
 144                 if (!ref_exists(name))
 145                         printf(_("Deleted tag '%s' (was %s)\n"),
 146                                 item->string + 10,
 147                                 repo_find_unique_abbrev(the_repository, oid, DEFAULT_ABBREV));
 148
 149                 free(oid);
 150         }
 151         string_list_clear(&refs_to_delete, 0);
 152         return result;
 153 }
 154
 155 static int verify_tag(const char *name, const char *ref,
 156                       const struct object_id *oid, void *cb_data)
 157 {
 158         int flags;
 159         struct ref_format *format = cb_data;
 160         flags = GPG_VERIFY_VERBOSE;
 161
 162         if (format->format)
 163                 flags = GPG_VERIFY_OMIT_STATUS;
 164
 165         if (gpg_verify_tag(oid, name, flags))
 166                 return -1;
 167
 168         if (format->format)
 169                 pretty_print_ref(name, oid, format);
 170
 171         return 0;
 172 }
 173
 174 static int do_sign(struct strbuf *buffer)
 175 {
 176         return sign_buffer(buffer, buffer, get_signing_key());
 177 }
 178
 179 static const char tag_template[] =
 180         N_("\nWrite a message for tag:\n  %s\n"
 181         "Lines starting with '%c' will be ignored.\n");
 182
 183 static const char tag_template_nocleanup[] =
 184         N_("\nWrite a message for tag:\n  %s\n"
 185         "Lines starting with '%c' will be kept; you may remove them"
 186         " yourself if you want to.\n");
 187
 188 static int git_tag_config(const char *var, const char *value, void *cb)
 189 {
 190         if (!strcmp(var, "tag.gpgsign")) {
 191                 config_sign_tag = git_config_bool(var, value);
 192                 return 0;
 193         }
 194
 195         if (!strcmp(var, "tag.sort")) {
 196                 if (!value)
 197                         return config_error_nonbool(var);
 198                 string_list_append(cb, value);
 199                 return 0;
 200         }
 201
 202         if (!strcmp(var, "tag.forcesignannotated")) {
 203                 force_sign_annotate = git_config_bool(var, value);
 204                 return 0;
 205         }
 206
 207         if (starts_with(var, "column."))
 208                 return git_column_config(var, value, "tag", &colopts);
 209         return git_color_default_config(var, value, cb);
 210 }
 211
 212 static void write_tag_body(int fd, const struct object_id *oid)
 213 {
 214         unsigned long size;
 215         enum object_type type;
 216         char *buf, *sp, *orig;
 217         struct strbuf payload = STRBUF_INIT;
 218         struct strbuf signature = STRBUF_INIT;
 219
 220         orig = buf = repo_read_object_file(the_repository, oid, &type, &size);
 221         if (!buf)
 222                 return;
 223         if (parse_signature(buf, size, &payload, &signature)) {
 224                 buf = payload.buf;
 225                 size = payload.len;
 226         }
 227         /* skip header */
 228         sp = strstr(buf, "\n\n");
 229
 230         if (!sp || !size || type != OBJ_TAG) {
 231                 free(buf);
 232                 return;
 233         }
 234         sp += 2; /* skip the 2 LFs */
 235         write_or_die(fd, sp, buf + size - sp);
 236
 237         free(orig);
 238         strbuf_release(&payload);
 239         strbuf_release(&signature);
 240 }
 241
 242 static int build_tag_object(struct strbuf *buf, int sign, struct object_id *result)
 243 {
 244         if (sign && do_sign(buf) < 0)
 245                 return error(_("unable to sign the tag"));
 246         if (write_object_file(buf->buf, buf->len, OBJ_TAG, result) < 0)
 247                 return error(_("unable to write tag file"));
 248         return 0;
 249 }
 250
 251 struct create_tag_options {
 252         unsigned int message_given:1;
 253         unsigned int use_editor:1;
 254         unsigned int sign;
 255         enum {
 256                 CLEANUP_NONE,
 257                 CLEANUP_SPACE,
 258                 CLEANUP_ALL
 259         } cleanup_mode;
 260 };
 261
 262 static const char message_advice_nested_tag[] =
 263         N_("You have created a nested tag. The object referred to by your new tag is\n"
 264            "already a tag. If you meant to tag the object that it points to, use:\n"
 265            "\n"
 266            "\tgit tag -f %s %s^{}");
 267
 268 static void create_tag(const struct object_id *object, const char *object_ref,
 269                        const char *tag,
 270                        struct strbuf *buf, struct create_tag_options *opt,
 271                        struct object_id *prev, struct object_id *result)
 272 {
 273         enum object_type type;
 274         struct strbuf header = STRBUF_INIT;
 275         char *path = NULL;
 276
 277         type = oid_object_info(the_repository, object, NULL);
 278         if (type <= OBJ_NONE)
 279                 die(_("bad object type."));
 280
 281         if (type == OBJ_TAG)
 282                 advise_if_enabled(ADVICE_NESTED_TAG, _(message_advice_nested_tag),
 283                                   tag, object_ref);
 284
 285         strbuf_addf(&header,
 286                     "object %s\n"
 287                     "type %s\n"
 288                     "tag %s\n"
 289                     "tagger %s\n\n",
 290                     oid_to_hex(object),
 291                     type_name(type),
 292                     tag,
 293                     git_committer_info(IDENT_STRICT));
 294
 295         if (!opt->message_given || opt->use_editor) {
 296                 int fd;
 297
 298                 /* write the template message before editing: */
 299                 path = git_pathdup("TAG_EDITMSG");
 300                 fd = xopen(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 301
 302                 if (opt->message_given) {
 303                         write_or_die(fd, buf->buf, buf->len);
 304                         strbuf_reset(buf);
 305                 } else if (!is_null_oid(prev)) {
 306                         write_tag_body(fd, prev);
 307                 } else {
 308                         struct strbuf buf = STRBUF_INIT;
 309                         strbuf_addch(&buf, '\n');
 310                         if (opt->cleanup_mode == CLEANUP_ALL)
 311                                 strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
 312                         else
 313                                 strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
 314                         write_or_die(fd, buf.buf, buf.len);
 315                         strbuf_release(&buf);
 316                 }
 317                 close(fd);
 318
 319                 if (launch_editor(path, buf, NULL)) {
 320                         fprintf(stderr,
 321                         _("Please supply the message using either -m or -F option.\n"));
 322                         exit(1);
 323                 }
 324         }
 325
 326         if (opt->cleanup_mode != CLEANUP_NONE)
 327                 strbuf_stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 328
 329         if (!opt->message_given && !buf->len)
 330                 die(_("no tag message?"));
 331
 332         strbuf_insert(buf, 0, header.buf, header.len);
 333         strbuf_release(&header);
 334
 335         if (build_tag_object(buf, opt->sign, result) < 0) {
 336                 if (path)
 337                         fprintf(stderr, _("The tag message has been left in %s\n"),
 338                                 path);
 339                 exit(128);
 340         }
 341         if (path) {
 342                 unlink_or_warn(path);
 343                 free(path);
 344         }
 345 }
 346
 347 static void create_reflog_msg(const struct object_id *oid, struct strbuf *sb)
 348 {
 349         enum object_type type;
 350         struct commit *c;
 351         char *buf;
 352         unsigned long size;
 353         int subject_len = 0;
 354         const char *subject_start;
 355
 356         char *rla = getenv("GIT_REFLOG_ACTION");
 357         if (rla) {
 358                 strbuf_addstr(sb, rla);
 359         } else {
 360                 strbuf_addstr(sb, "tag: tagging ");
 361                 strbuf_add_unique_abbrev(sb, oid, DEFAULT_ABBREV);
 362         }
 363
 364         strbuf_addstr(sb, " (");
 365         type = oid_object_info(the_repository, oid, NULL);
 366         switch (type) {
 367         default:
 368                 strbuf_addstr(sb, "object of unknown type");
 369                 break;
 370         case OBJ_COMMIT:
 371                 if ((buf = repo_read_object_file(the_repository, oid, &type, &size))) {
 372                         subject_len = find_commit_subject(buf, &subject_start);
 373                         strbuf_insert(sb, sb->len, subject_start, subject_len);
 374                 } else {
 375                         strbuf_addstr(sb, "commit object");
 376                 }
 377                 free(buf);
 378
 379                 if ((c = lookup_commit_reference(the_repository, oid)))
 380                         strbuf_addf(sb, ", %s", show_date(c->date, 0, DATE_MODE(SHORT)));
 381                 break;
 382         case OBJ_TREE:
 383                 strbuf_addstr(sb, "tree object");
 384                 break;
 385         case OBJ_BLOB:
 386                 strbuf_addstr(sb, "blob object");
 387                 break;
 388         case OBJ_TAG:
 389                 strbuf_addstr(sb, "other tag object");
 390                 break;
 391         }
 392         strbuf_addch(sb, ')');
 393 }
 394
 395 struct msg_arg {
 396         int given;
 397         struct strbuf buf;
 398 };
 399
 400 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 401 {
 402         struct msg_arg *msg = opt->value;
 403
 404         BUG_ON_OPT_NEG(unset);
 405
 406         if (!arg)
 407                 return -1;
 408         if (msg->buf.len)
 409                 strbuf_addstr(&(msg->buf), "\n\n");
 410         strbuf_addstr(&(msg->buf), arg);
 411         msg->given = 1;
 412         return 0;
 413 }
 414
 415 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 416 {
 417         if (name[0] == '-')
 418                 return -1;
 419
 420         strbuf_reset(sb);
 421         strbuf_addf(sb, "refs/tags/%s", name);
 422
 423         return check_refname_format(sb->buf, 0);
 424 }
 425
 426 int cmd_tag(int argc, const char **argv, const char *prefix)
 427 {
 428         struct strbuf buf = STRBUF_INIT;
 429         struct strbuf ref = STRBUF_INIT;
 430         struct strbuf reflog_msg = STRBUF_INIT;
 431         struct object_id object, prev;
 432         const char *object_ref, *tag;
 433         struct create_tag_options opt;
 434         char *cleanup_arg = NULL;
 435         int create_reflog = 0;
 436         int annotate = 0, force = 0;
 437         int cmdmode = 0, create_tag_object = 0;
 438         char *msgfile = NULL;
 439         const char *keyid = NULL;
 440         struct msg_arg msg = { .buf = STRBUF_INIT };
 441         struct ref_transaction *transaction;
 442         struct strbuf err = STRBUF_INIT;
 443         struct ref_filter filter;
 444         struct ref_sorting *sorting;
 445         struct string_list sorting_options = STRING_LIST_INIT_DUP;
 446         struct ref_format format = REF_FORMAT_INIT;
 447         int icase = 0;
 448         int edit_flag = 0;
 449         struct option options[] = {
 450                 OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 451                 { OPTION_INTEGER, 'n', NULL, &filter.lines, N_("n"),
 452                                 N_("print <n> lines of each tag message"),
 453                                 PARSE_OPT_OPTARG, NULL, 1 },
 454                 OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 455                 OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 456
 457                 OPT_GROUP(N_("Tag creation options")),
 458                 OPT_BOOL('a', "annotate", &annotate,
 459                                         N_("annotated tag, needs a message")),
 460                 OPT_CALLBACK_F('m', "message", &msg, N_("message"),
 461                                N_("tag message"), PARSE_OPT_NONEG, parse_msg_arg),
 462                 OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 463                 OPT_BOOL('e', "edit", &edit_flag, N_("force edit of tag message")),
 464                 OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 465                 OPT_CLEANUP(&cleanup_arg),
 466                 OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 467                                         N_("use another key to sign the tag")),
 468                 OPT__FORCE(&force, N_("replace the tag if exists"), 0),
 469                 OPT_BOOL(0, "create-reflog", &create_reflog, N_("create a reflog")),
 470
 471                 OPT_GROUP(N_("Tag listing options")),
 472                 OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 473                 OPT_CONTAINS(&filter.with_commit, N_("print only tags that contain the commit")),
 474                 OPT_NO_CONTAINS(&filter.no_commit, N_("print only tags that don't contain the commit")),
 475                 OPT_WITH(&filter.with_commit, N_("print only tags that contain the commit")),
 476                 OPT_WITHOUT(&filter.no_commit, N_("print only tags that don't contain the commit")),
 477                 OPT_MERGED(&filter, N_("print only tags that are merged")),
 478                 OPT_NO_MERGED(&filter, N_("print only tags that are not merged")),
 479                 OPT_BOOL(0, "omit-empty",  &omit_empty,
 480                         N_("do not output a newline after empty formatted refs")),
 481                 OPT_REF_SORT(&sorting_options),
 482                 {
 483                         OPTION_CALLBACK, 0, "points-at", &filter.points_at, N_("object"),
 484                         N_("print only tags of the object"), PARSE_OPT_LASTARG_DEFAULT,
 485                         parse_opt_object_name, (intptr_t) "HEAD"
 486                 },
 487                 OPT_STRING(  0 , "format", &format.format, N_("format"),
 488                            N_("format to use for the output")),
 489                 OPT__COLOR(&format.use_color, N_("respect format colors")),
 490                 OPT_BOOL('i', "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
 491                 OPT_END()
 492         };
 493         int ret = 0;
 494         const char *only_in_list = NULL;
 495
 496         setup_ref_filter_porcelain_msg();
 497
 498         git_config(git_tag_config, &sorting_options);
 499
 500         memset(&opt, 0, sizeof(opt));
 501         memset(&filter, 0, sizeof(filter));
 502         filter.lines = -1;
 503         opt.sign = -1;
 504
 505         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 506
 507         if (!cmdmode) {
 508                 if (argc == 0)
 509                         cmdmode = 'l';
 510                 else if (filter.with_commit || filter.no_commit ||
 511                          filter.reachable_from || filter.unreachable_from ||
 512                          filter.points_at.nr || filter.lines != -1)
 513                         cmdmode = 'l';
 514         }
 515
 516         if (cmdmode == 'l')
 517                 setup_auto_pager("tag", 1);
 518
 519         if (opt.sign == -1)
 520                 opt.sign = cmdmode ? 0 : config_sign_tag > 0;
 521
 522         if (keyid) {
 523                 opt.sign = 1;
 524                 set_signing_key(keyid);
 525         }
 526         create_tag_object = (opt.sign || annotate || msg.given || msgfile);
 527
 528         if ((create_tag_object || force) && (cmdmode != 0))
 529                 usage_with_options(git_tag_usage, options);
 530
 531         finalize_colopts(&colopts, -1);
 532         if (cmdmode == 'l' && filter.lines != -1) {
 533                 if (explicitly_enable_column(colopts))
 534                         die(_("options '%s' and '%s' cannot be used together"), "--column", "-n");
 535                 colopts = 0;
 536         }
 537         sorting = ref_sorting_options(&sorting_options);
 538         ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
 539         filter.ignore_case = icase;
 540         if (cmdmode == 'l') {
 541                 if (column_active(colopts)) {
 542                         struct column_options copts;
 543                         memset(&copts, 0, sizeof(copts));
 544                         copts.padding = 2;
 545                         run_column_filter(colopts, &copts);
 546                 }
 547                 filter.name_patterns = argv;
 548                 ret = list_tags(&filter, sorting, &format);
 549                 if (column_active(colopts))
 550                         stop_column_filter();
 551                 goto cleanup;
 552         }
 553         if (filter.lines != -1)
 554                 only_in_list = "-n";
 555         else if (filter.with_commit)
 556                 only_in_list = "--contains";
 557         else if (filter.no_commit)
 558                 only_in_list = "--no-contains";
 559         else if (filter.points_at.nr)
 560                 only_in_list = "--points-at";
 561         else if (filter.reachable_from)
 562                 only_in_list = "--merged";
 563         else if (filter.unreachable_from)
 564                 only_in_list = "--no-merged";
 565         if (only_in_list)
 566                 die(_("the '%s' option is only allowed in list mode"), only_in_list);
 567         if (cmdmode == 'd') {
 568                 ret = delete_tags(argv);
 569                 goto cleanup;
 570         }
 571         if (cmdmode == 'v') {
 572                 if (format.format && verify_ref_format(&format))
 573                         usage_with_options(git_tag_usage, options);
 574                 ret = for_each_tag_name(argv, verify_tag, &format);
 575                 goto cleanup;
 576         }
 577
 578         if (msg.given || msgfile) {
 579                 if (msg.given && msgfile)
 580                         die(_("options '%s' and '%s' cannot be used together"), "-F", "-m");
 581                 if (msg.given)
 582                         strbuf_addbuf(&buf, &(msg.buf));
 583                 else {
 584                         if (!strcmp(msgfile, "-")) {
 585                                 if (strbuf_read(&buf, 0, 1024) < 0)
 586                                         die_errno(_("cannot read '%s'"), msgfile);
 587                         } else {
 588                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 589                                         die_errno(_("could not open or read '%s'"),
 590                                                 msgfile);
 591                         }
 592                 }
 593         }
 594
 595         tag = argv[0];
 596
 597         object_ref = argc == 2 ? argv[1] : "HEAD";
 598         if (argc > 2)
 599                 die(_("too many arguments"));
 600
 601         if (repo_get_oid(the_repository, object_ref, &object))
 602                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 603
 604         if (strbuf_check_tag_ref(&ref, tag))
 605                 die(_("'%s' is not a valid tag name."), tag);
 606
 607         if (read_ref(ref.buf, &prev))
 608                 oidclr(&prev);
 609         else if (!force)
 610                 die(_("tag '%s' already exists"), tag);
 611
 612         opt.message_given = msg.given || msgfile;
 613         opt.use_editor = edit_flag;
 614
 615         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 616                 opt.cleanup_mode = CLEANUP_ALL;
 617         else if (!strcmp(cleanup_arg, "verbatim"))
 618                 opt.cleanup_mode = CLEANUP_NONE;
 619         else if (!strcmp(cleanup_arg, "whitespace"))
 620                 opt.cleanup_mode = CLEANUP_SPACE;
 621         else
 622                 die(_("Invalid cleanup mode %s"), cleanup_arg);
 623
 624         create_reflog_msg(&object, &reflog_msg);
 625
 626         if (create_tag_object) {
 627                 if (force_sign_annotate && !annotate)
 628                         opt.sign = 1;
 629                 create_tag(&object, object_ref, tag, &buf, &opt, &prev, &object);
 630         }
 631
 632         transaction = ref_transaction_begin(&err);
 633         if (!transaction ||
 634             ref_transaction_update(transaction, ref.buf, &object, &prev,
 635                                    create_reflog ? REF_FORCE_CREATE_REFLOG : 0,
 636                                    reflog_msg.buf, &err) ||
 637             ref_transaction_commit(transaction, &err))
 638                 die("%s", err.buf);
 639         ref_transaction_free(transaction);
 640         if (force && !is_null_oid(&prev) && !oideq(&prev, &object))
 641                 printf(_("Updated tag '%s' (was %s)\n"), tag,
 642                        repo_find_unique_abbrev(the_repository, &prev, DEFAULT_ABBREV));
 643
 644 cleanup:
 645         ref_sorting_release(sorting);
 646         strbuf_release(&buf);
 647         strbuf_release(&ref);
 648         strbuf_release(&reflog_msg);
 649         strbuf_release(&msg.buf);
 650         strbuf_release(&err);
 651         free(msgfile);
 652         return ret;
 653 }