Andrew's git / gitweb.git / builtin/tag.c
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builtin / tag.con commit Merge branch 'jh/quiltimport-explicit-series-file' (db9789a)
   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
  21static 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
  35static int tag_sort;
  36
  37struct 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
  45static struct sha1_array points_at;
  46static unsigned int colopts;
  47
  48static 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 */
  63static 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
  81static 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 */
  94enum 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 */
 104static 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 */
 132struct stack {
 133        int nr, alloc;
 134        struct stack_entry {
 135                struct commit *commit;
 136                struct commit_list *parents;
 137        } *stack;
 138};
 139
 140static 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
 148static 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
 188static 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        }
 223free_return:
 224        free(buf);
 225}
 226
 227static 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
 261static 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
 268static 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
 297typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 298                                const unsigned char *sha1);
 299
 300static 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
 325static 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
 334static 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
 346static int do_sign(struct strbuf *buffer)
 347{
 348        return sign_buffer(buffer, buffer, get_signing_key());
 349}
 350
 351static const char tag_template[] =
 352        N_("\nWrite a message for tag:\n  %s\n"
 353        "Lines starting with '%c' will be ignored.\n");
 354
 355static 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 */
 366static 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
 393static 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
 412static 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
 434static 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
 443struct 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
 453static 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
 529struct msg_arg {
 530        int given;
 531        struct strbuf buf;
 532};
 533
 534static 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
 547static 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
 558static 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
 565int 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 create_reflog = 0;
 575        int cmdmode = 0;
 576        const char *msgfile = NULL, *keyid = NULL;
 577        struct msg_arg msg = { 0, STRBUF_INIT };
 578        struct commit_list *with_commit = NULL;
 579        struct ref_transaction *transaction;
 580        struct strbuf err = STRBUF_INIT;
 581        struct option options[] = {
 582                OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 583                { OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
 584                                N_("print <n> lines of each tag message"),
 585                                PARSE_OPT_OPTARG, NULL, 1 },
 586                OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 587                OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 588
 589                OPT_GROUP(N_("Tag creation options")),
 590                OPT_BOOL('a', "annotate", &annotate,
 591                                        N_("annotated tag, needs a message")),
 592                OPT_CALLBACK('m', "message", &msg, N_("message"),
 593                             N_("tag message"), parse_msg_arg),
 594                OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 595                OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 596                OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 597                        N_("how to strip spaces and #comments from message")),
 598                OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 599                                        N_("use another key to sign the tag")),
 600                OPT__FORCE(&force, N_("replace the tag if exists")),
 601                OPT_BOOL(0, "create-reflog", &create_reflog, N_("create a reflog")),
 602
 603                OPT_GROUP(N_("Tag listing options")),
 604                OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 605                OPT_CONTAINS(&with_commit, N_("print only tags that contain the commit")),
 606                OPT_WITH(&with_commit, N_("print only tags that contain the commit")),
 607                {
 608                        OPTION_CALLBACK, 0, "sort", &tag_sort, N_("type"), N_("sort tags"),
 609                        PARSE_OPT_NONEG, parse_opt_sort
 610                },
 611                {
 612                        OPTION_CALLBACK, 0, "points-at", &points_at, N_("object"),
 613                        N_("print only tags of the object"), 0, parse_opt_object_name
 614                },
 615                OPT_END()
 616        };
 617
 618        git_config(git_tag_config, NULL);
 619
 620        memset(&opt, 0, sizeof(opt));
 621
 622        argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 623
 624        if (keyid) {
 625                opt.sign = 1;
 626                set_signing_key(keyid);
 627        }
 628        if (opt.sign)
 629                annotate = 1;
 630        if (argc == 0 && !cmdmode)
 631                cmdmode = 'l';
 632
 633        if ((annotate || msg.given || msgfile || force) && (cmdmode != 0))
 634                usage_with_options(git_tag_usage, options);
 635
 636        finalize_colopts(&colopts, -1);
 637        if (cmdmode == 'l' && lines != -1) {
 638                if (explicitly_enable_column(colopts))
 639                        die(_("--column and -n are incompatible"));
 640                colopts = 0;
 641        }
 642        if (cmdmode == 'l') {
 643                int ret;
 644                if (column_active(colopts)) {
 645                        struct column_options copts;
 646                        memset(&copts, 0, sizeof(copts));
 647                        copts.padding = 2;
 648                        run_column_filter(colopts, &copts);
 649                }
 650                if (lines != -1 && tag_sort)
 651                        die(_("--sort and -n are incompatible"));
 652                ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit, tag_sort);
 653                if (column_active(colopts))
 654                        stop_column_filter();
 655                return ret;
 656        }
 657        if (lines != -1)
 658                die(_("-n option is only allowed with -l."));
 659        if (with_commit)
 660                die(_("--contains option is only allowed with -l."));
 661        if (points_at.nr)
 662                die(_("--points-at option is only allowed with -l."));
 663        if (cmdmode == 'd')
 664                return for_each_tag_name(argv, delete_tag);
 665        if (cmdmode == 'v')
 666                return for_each_tag_name(argv, verify_tag);
 667
 668        if (msg.given || msgfile) {
 669                if (msg.given && msgfile)
 670                        die(_("only one -F or -m option is allowed."));
 671                annotate = 1;
 672                if (msg.given)
 673                        strbuf_addbuf(&buf, &(msg.buf));
 674                else {
 675                        if (!strcmp(msgfile, "-")) {
 676                                if (strbuf_read(&buf, 0, 1024) < 0)
 677                                        die_errno(_("cannot read '%s'"), msgfile);
 678                        } else {
 679                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 680                                        die_errno(_("could not open or read '%s'"),
 681                                                msgfile);
 682                        }
 683                }
 684        }
 685
 686        tag = argv[0];
 687
 688        object_ref = argc == 2 ? argv[1] : "HEAD";
 689        if (argc > 2)
 690                die(_("too many params"));
 691
 692        if (get_sha1(object_ref, object))
 693                die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 694
 695        if (strbuf_check_tag_ref(&ref, tag))
 696                die(_("'%s' is not a valid tag name."), tag);
 697
 698        if (read_ref(ref.buf, prev))
 699                hashclr(prev);
 700        else if (!force)
 701                die(_("tag '%s' already exists"), tag);
 702
 703        opt.message_given = msg.given || msgfile;
 704
 705        if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 706                opt.cleanup_mode = CLEANUP_ALL;
 707        else if (!strcmp(cleanup_arg, "verbatim"))
 708                opt.cleanup_mode = CLEANUP_NONE;
 709        else if (!strcmp(cleanup_arg, "whitespace"))
 710                opt.cleanup_mode = CLEANUP_SPACE;
 711        else
 712                die(_("Invalid cleanup mode %s"), cleanup_arg);
 713
 714        if (annotate)
 715                create_tag(object, tag, &buf, &opt, prev, object);
 716
 717        transaction = ref_transaction_begin(&err);
 718        if (!transaction ||
 719            ref_transaction_update(transaction, ref.buf, object, prev,
 720                                   create_reflog ? REF_FORCE_CREATE_REFLOG : 0,
 721                                   NULL, &err) ||
 722            ref_transaction_commit(transaction, &err))
 723                die("%s", err.buf);
 724        ref_transaction_free(transaction);
 725        if (force && !is_null_sha1(prev) && hashcmp(prev, object))
 726                printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 727
 728        strbuf_release(&err);
 729        strbuf_release(&buf);
 730        strbuf_release(&ref);
 731        return 0;
 732}