Andrew's git / gitweb.git / builtin/tag.c
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builtin / tag.con commit worktree: add 'list' command (bb9c03b)
   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
  59static 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
  77static 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
  85enum 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 */
  95static 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 */
 123struct stack {
 124        int nr, alloc;
 125        struct stack_entry {
 126                struct commit *commit;
 127                struct commit_list *parents;
 128        } *stack;
 129};
 130
 131static 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
 139static 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
 179static 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        }
 214free_return:
 215        free(buf);
 216}
 217
 218static 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
 252static 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
 259static 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
 288typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 289                                const unsigned char *sha1);
 290
 291static 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
 316static 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
 325static 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
 337static int do_sign(struct strbuf *buffer)
 338{
 339        return sign_buffer(buffer, buffer, get_signing_key());
 340}
 341
 342static const char tag_template[] =
 343        N_("\nWrite a message for tag:\n  %s\n"
 344        "Lines starting with '%c' will be ignored.\n");
 345
 346static 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 */
 357static 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
 384static 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
 403static 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
 425static 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
 434struct 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
 444static 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
 520struct msg_arg {
 521        int given;
 522        struct strbuf buf;
 523};
 524
 525static 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
 538static 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
 549static 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
 566static 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
 573int 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 create_reflog = 0;
 583        int cmdmode = 0;
 584        const char *msgfile = NULL, *keyid = NULL;
 585        struct msg_arg msg = { 0, STRBUF_INIT };
 586        struct commit_list *with_commit = NULL;
 587        struct ref_transaction *transaction;
 588        struct strbuf err = STRBUF_INIT;
 589        struct option options[] = {
 590                OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 591                { OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
 592                                N_("print <n> lines of each tag message"),
 593                                PARSE_OPT_OPTARG, NULL, 1 },
 594                OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 595                OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 596
 597                OPT_GROUP(N_("Tag creation options")),
 598                OPT_BOOL('a', "annotate", &annotate,
 599                                        N_("annotated tag, needs a message")),
 600                OPT_CALLBACK('m', "message", &msg, N_("message"),
 601                             N_("tag message"), parse_msg_arg),
 602                OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 603                OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 604                OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 605                        N_("how to strip spaces and #comments from message")),
 606                OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 607                                        N_("use another key to sign the tag")),
 608                OPT__FORCE(&force, N_("replace the tag if exists")),
 609                OPT_BOOL(0, "create-reflog", &create_reflog, N_("create a reflog")),
 610
 611                OPT_GROUP(N_("Tag listing options")),
 612                OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 613                {
 614                        OPTION_CALLBACK, 0, "sort", &tag_sort, N_("type"), N_("sort tags"),
 615                        PARSE_OPT_NONEG, parse_opt_sort
 616                },
 617                {
 618                        OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
 619                        N_("print only tags that contain the commit"),
 620                        PARSE_OPT_LASTARG_DEFAULT,
 621                        parse_opt_with_commit, (intptr_t)"HEAD",
 622                },
 623                {
 624                        OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
 625                        N_("print only tags that contain the commit"),
 626                        PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
 627                        parse_opt_with_commit, (intptr_t)"HEAD",
 628                },
 629                {
 630                        OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
 631                        N_("print only tags of the object"), 0, parse_opt_points_at
 632                },
 633                OPT_END()
 634        };
 635
 636        git_config(git_tag_config, NULL);
 637
 638        memset(&opt, 0, sizeof(opt));
 639
 640        argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 641
 642        if (keyid) {
 643                opt.sign = 1;
 644                set_signing_key(keyid);
 645        }
 646        if (opt.sign)
 647                annotate = 1;
 648        if (argc == 0 && !cmdmode)
 649                cmdmode = 'l';
 650
 651        if ((annotate || msg.given || msgfile || force) && (cmdmode != 0))
 652                usage_with_options(git_tag_usage, options);
 653
 654        finalize_colopts(&colopts, -1);
 655        if (cmdmode == 'l' && lines != -1) {
 656                if (explicitly_enable_column(colopts))
 657                        die(_("--column and -n are incompatible"));
 658                colopts = 0;
 659        }
 660        if (cmdmode == 'l') {
 661                int ret;
 662                if (column_active(colopts)) {
 663                        struct column_options copts;
 664                        memset(&copts, 0, sizeof(copts));
 665                        copts.padding = 2;
 666                        run_column_filter(colopts, &copts);
 667                }
 668                if (lines != -1 && tag_sort)
 669                        die(_("--sort and -n are incompatible"));
 670                ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit, tag_sort);
 671                if (column_active(colopts))
 672                        stop_column_filter();
 673                return ret;
 674        }
 675        if (lines != -1)
 676                die(_("-n option is only allowed with -l."));
 677        if (with_commit)
 678                die(_("--contains option is only allowed with -l."));
 679        if (points_at.nr)
 680                die(_("--points-at option is only allowed with -l."));
 681        if (cmdmode == 'd')
 682                return for_each_tag_name(argv, delete_tag);
 683        if (cmdmode == 'v')
 684                return for_each_tag_name(argv, verify_tag);
 685
 686        if (msg.given || msgfile) {
 687                if (msg.given && msgfile)
 688                        die(_("only one -F or -m option is allowed."));
 689                annotate = 1;
 690                if (msg.given)
 691                        strbuf_addbuf(&buf, &(msg.buf));
 692                else {
 693                        if (!strcmp(msgfile, "-")) {
 694                                if (strbuf_read(&buf, 0, 1024) < 0)
 695                                        die_errno(_("cannot read '%s'"), msgfile);
 696                        } else {
 697                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 698                                        die_errno(_("could not open or read '%s'"),
 699                                                msgfile);
 700                        }
 701                }
 702        }
 703
 704        tag = argv[0];
 705
 706        object_ref = argc == 2 ? argv[1] : "HEAD";
 707        if (argc > 2)
 708                die(_("too many params"));
 709
 710        if (get_sha1(object_ref, object))
 711                die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 712
 713        if (strbuf_check_tag_ref(&ref, tag))
 714                die(_("'%s' is not a valid tag name."), tag);
 715
 716        if (read_ref(ref.buf, prev))
 717                hashclr(prev);
 718        else if (!force)
 719                die(_("tag '%s' already exists"), tag);
 720
 721        opt.message_given = msg.given || msgfile;
 722
 723        if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 724                opt.cleanup_mode = CLEANUP_ALL;
 725        else if (!strcmp(cleanup_arg, "verbatim"))
 726                opt.cleanup_mode = CLEANUP_NONE;
 727        else if (!strcmp(cleanup_arg, "whitespace"))
 728                opt.cleanup_mode = CLEANUP_SPACE;
 729        else
 730                die(_("Invalid cleanup mode %s"), cleanup_arg);
 731
 732        if (annotate)
 733                create_tag(object, tag, &buf, &opt, prev, object);
 734
 735        transaction = ref_transaction_begin(&err);
 736        if (!transaction ||
 737            ref_transaction_update(transaction, ref.buf, object, prev,
 738                                   create_reflog ? REF_FORCE_CREATE_REFLOG : 0,
 739                                   NULL, &err) ||
 740            ref_transaction_commit(transaction, &err))
 741                die("%s", err.buf);
 742        ref_transaction_free(transaction);
 743        if (force && !is_null_sha1(prev) && hashcmp(prev, object))
 744                printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 745
 746        strbuf_release(&err);
 747        strbuf_release(&buf);
 748        strbuf_release(&ref);
 749        return 0;
 750}