Andrew's git / gitweb.git / builtin/tag.c
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builtin / tag.con commit in_merge_bases(): support only one "other" commit (a20efee)
   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
  19static const char * const git_tag_usage[] = {
  20        "git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
  21        "git tag -d <tagname>...",
  22        "git tag -l [-n[<num>]] [<pattern>...]",
  23        "git tag -v <tagname>...",
  24        NULL
  25};
  26
  27struct tag_filter {
  28        const char **patterns;
  29        int lines;
  30        struct commit_list *with_commit;
  31};
  32
  33static int match_pattern(const char **patterns, const char *ref)
  34{
  35        /* no pattern means match everything */
  36        if (!*patterns)
  37                return 1;
  38        for (; *patterns; patterns++)
  39                if (!fnmatch(*patterns, ref, 0))
  40                        return 1;
  41        return 0;
  42}
  43
  44static int in_commit_list(const struct commit_list *want, struct commit *c)
  45{
  46        for (; want; want = want->next)
  47                if (!hashcmp(want->item->object.sha1, c->object.sha1))
  48                        return 1;
  49        return 0;
  50}
  51
  52static int contains_recurse(struct commit *candidate,
  53                            const struct commit_list *want)
  54{
  55        struct commit_list *p;
  56
  57        /* was it previously marked as containing a want commit? */
  58        if (candidate->object.flags & TMP_MARK)
  59                return 1;
  60        /* or marked as not possibly containing a want commit? */
  61        if (candidate->object.flags & UNINTERESTING)
  62                return 0;
  63        /* or are we it? */
  64        if (in_commit_list(want, candidate))
  65                return 1;
  66
  67        if (parse_commit(candidate) < 0)
  68                return 0;
  69
  70        /* Otherwise recurse and mark ourselves for future traversals. */
  71        for (p = candidate->parents; p; p = p->next) {
  72                if (contains_recurse(p->item, want)) {
  73                        candidate->object.flags |= TMP_MARK;
  74                        return 1;
  75                }
  76        }
  77        candidate->object.flags |= UNINTERESTING;
  78        return 0;
  79}
  80
  81static int contains(struct commit *candidate, const struct commit_list *want)
  82{
  83        return contains_recurse(candidate, want);
  84}
  85
  86static void show_tag_lines(const unsigned char *sha1, int lines)
  87{
  88        int i;
  89        unsigned long size;
  90        enum object_type type;
  91        char *buf, *sp, *eol;
  92        size_t len;
  93
  94        buf = read_sha1_file(sha1, &type, &size);
  95        if (!buf)
  96                die_errno("unable to read object %s", sha1_to_hex(sha1));
  97        if (type != OBJ_COMMIT && type != OBJ_TAG)
  98                goto free_return;
  99        if (!size)
 100                die("an empty %s object %s?",
 101                    typename(type), sha1_to_hex(sha1));
 102
 103        /* skip header */
 104        sp = strstr(buf, "\n\n");
 105        if (!sp)
 106                goto free_return;
 107
 108        /* only take up to "lines" lines, and strip the signature from a tag */
 109        if (type == OBJ_TAG)
 110                size = parse_signature(buf, size);
 111        for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
 112                if (i)
 113                        printf("\n    ");
 114                eol = memchr(sp, '\n', size - (sp - buf));
 115                len = eol ? eol - sp : size - (sp - buf);
 116                fwrite(sp, len, 1, stdout);
 117                if (!eol)
 118                        break;
 119                sp = eol + 1;
 120        }
 121free_return:
 122        free(buf);
 123}
 124
 125static int show_reference(const char *refname, const unsigned char *sha1,
 126                          int flag, void *cb_data)
 127{
 128        struct tag_filter *filter = cb_data;
 129
 130        if (match_pattern(filter->patterns, refname)) {
 131                if (filter->with_commit) {
 132                        struct commit *commit;
 133
 134                        commit = lookup_commit_reference_gently(sha1, 1);
 135                        if (!commit)
 136                                return 0;
 137                        if (!contains(commit, filter->with_commit))
 138                                return 0;
 139                }
 140
 141                if (!filter->lines) {
 142                        printf("%s\n", refname);
 143                        return 0;
 144                }
 145                printf("%-15s ", refname);
 146                show_tag_lines(sha1, filter->lines);
 147                putchar('\n');
 148        }
 149
 150        return 0;
 151}
 152
 153static int list_tags(const char **patterns, int lines,
 154                        struct commit_list *with_commit)
 155{
 156        struct tag_filter filter;
 157
 158        filter.patterns = patterns;
 159        filter.lines = lines;
 160        filter.with_commit = with_commit;
 161
 162        for_each_tag_ref(show_reference, (void *) &filter);
 163
 164        return 0;
 165}
 166
 167typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 168                                const unsigned char *sha1);
 169
 170static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 171{
 172        const char **p;
 173        char ref[PATH_MAX];
 174        int had_error = 0;
 175        unsigned char sha1[20];
 176
 177        for (p = argv; *p; p++) {
 178                if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 179                                        >= sizeof(ref)) {
 180                        error(_("tag name too long: %.*s..."), 50, *p);
 181                        had_error = 1;
 182                        continue;
 183                }
 184                if (read_ref(ref, sha1)) {
 185                        error(_("tag '%s' not found."), *p);
 186                        had_error = 1;
 187                        continue;
 188                }
 189                if (fn(*p, ref, sha1))
 190                        had_error = 1;
 191        }
 192        return had_error;
 193}
 194
 195static int delete_tag(const char *name, const char *ref,
 196                                const unsigned char *sha1)
 197{
 198        if (delete_ref(ref, sha1, 0))
 199                return 1;
 200        printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 201        return 0;
 202}
 203
 204static int verify_tag(const char *name, const char *ref,
 205                                const unsigned char *sha1)
 206{
 207        const char *argv_verify_tag[] = {"verify-tag",
 208                                        "-v", "SHA1_HEX", NULL};
 209        argv_verify_tag[2] = sha1_to_hex(sha1);
 210
 211        if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 212                return error(_("could not verify the tag '%s'"), name);
 213        return 0;
 214}
 215
 216static int do_sign(struct strbuf *buffer)
 217{
 218        return sign_buffer(buffer, buffer, get_signing_key());
 219}
 220
 221static const char tag_template[] =
 222        N_("\n"
 223        "#\n"
 224        "# Write a tag message\n"
 225        "# Lines starting with '#' will be ignored.\n"
 226        "#\n");
 227
 228static const char tag_template_nocleanup[] =
 229        N_("\n"
 230        "#\n"
 231        "# Write a tag message\n"
 232        "# Lines starting with '#' will be kept; you may remove them"
 233        " yourself if you want to.\n"
 234        "#\n");
 235
 236static int git_tag_config(const char *var, const char *value, void *cb)
 237{
 238        int status = git_gpg_config(var, value, cb);
 239        if (status)
 240                return status;
 241        return git_default_config(var, value, cb);
 242}
 243
 244static void write_tag_body(int fd, const unsigned char *sha1)
 245{
 246        unsigned long size;
 247        enum object_type type;
 248        char *buf, *sp;
 249
 250        buf = read_sha1_file(sha1, &type, &size);
 251        if (!buf)
 252                return;
 253        /* skip header */
 254        sp = strstr(buf, "\n\n");
 255
 256        if (!sp || !size || type != OBJ_TAG) {
 257                free(buf);
 258                return;
 259        }
 260        sp += 2; /* skip the 2 LFs */
 261        write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 262
 263        free(buf);
 264}
 265
 266static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 267{
 268        if (sign && do_sign(buf) < 0)
 269                return error(_("unable to sign the tag"));
 270        if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 271                return error(_("unable to write tag file"));
 272        return 0;
 273}
 274
 275struct create_tag_options {
 276        unsigned int message_given:1;
 277        unsigned int sign;
 278        enum {
 279                CLEANUP_NONE,
 280                CLEANUP_SPACE,
 281                CLEANUP_ALL
 282        } cleanup_mode;
 283};
 284
 285static void create_tag(const unsigned char *object, const char *tag,
 286                       struct strbuf *buf, struct create_tag_options *opt,
 287                       unsigned char *prev, unsigned char *result)
 288{
 289        enum object_type type;
 290        char header_buf[1024];
 291        int header_len;
 292        char *path = NULL;
 293
 294        type = sha1_object_info(object, NULL);
 295        if (type <= OBJ_NONE)
 296            die(_("bad object type."));
 297
 298        header_len = snprintf(header_buf, sizeof(header_buf),
 299                          "object %s\n"
 300                          "type %s\n"
 301                          "tag %s\n"
 302                          "tagger %s\n\n",
 303                          sha1_to_hex(object),
 304                          typename(type),
 305                          tag,
 306                          git_committer_info(IDENT_ERROR_ON_NO_NAME));
 307
 308        if (header_len > sizeof(header_buf) - 1)
 309                die(_("tag header too big."));
 310
 311        if (!opt->message_given) {
 312                int fd;
 313
 314                /* write the template message before editing: */
 315                path = git_pathdup("TAG_EDITMSG");
 316                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 317                if (fd < 0)
 318                        die_errno(_("could not create file '%s'"), path);
 319
 320                if (!is_null_sha1(prev))
 321                        write_tag_body(fd, prev);
 322                else if (opt->cleanup_mode == CLEANUP_ALL)
 323                        write_or_die(fd, _(tag_template),
 324                                        strlen(_(tag_template)));
 325                else
 326                        write_or_die(fd, _(tag_template_nocleanup),
 327                                        strlen(_(tag_template_nocleanup)));
 328                close(fd);
 329
 330                if (launch_editor(path, buf, NULL)) {
 331                        fprintf(stderr,
 332                        _("Please supply the message using either -m or -F option.\n"));
 333                        exit(1);
 334                }
 335        }
 336
 337        if (opt->cleanup_mode != CLEANUP_NONE)
 338                stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 339
 340        if (!opt->message_given && !buf->len)
 341                die(_("no tag message?"));
 342
 343        strbuf_insert(buf, 0, header_buf, header_len);
 344
 345        if (build_tag_object(buf, opt->sign, result) < 0) {
 346                if (path)
 347                        fprintf(stderr, _("The tag message has been left in %s\n"),
 348                                path);
 349                exit(128);
 350        }
 351        if (path) {
 352                unlink_or_warn(path);
 353                free(path);
 354        }
 355}
 356
 357struct msg_arg {
 358        int given;
 359        struct strbuf buf;
 360};
 361
 362static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 363{
 364        struct msg_arg *msg = opt->value;
 365
 366        if (!arg)
 367                return -1;
 368        if (msg->buf.len)
 369                strbuf_addstr(&(msg->buf), "\n\n");
 370        strbuf_addstr(&(msg->buf), arg);
 371        msg->given = 1;
 372        return 0;
 373}
 374
 375static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 376{
 377        if (name[0] == '-')
 378                return -1;
 379
 380        strbuf_reset(sb);
 381        strbuf_addf(sb, "refs/tags/%s", name);
 382
 383        return check_refname_format(sb->buf, 0);
 384}
 385
 386int cmd_tag(int argc, const char **argv, const char *prefix)
 387{
 388        struct strbuf buf = STRBUF_INIT;
 389        struct strbuf ref = STRBUF_INIT;
 390        unsigned char object[20], prev[20];
 391        const char *object_ref, *tag;
 392        struct ref_lock *lock;
 393        struct create_tag_options opt;
 394        char *cleanup_arg = NULL;
 395        int annotate = 0, force = 0, lines = -1, list = 0,
 396                delete = 0, verify = 0;
 397        const char *msgfile = NULL, *keyid = NULL;
 398        struct msg_arg msg = { 0, STRBUF_INIT };
 399        struct commit_list *with_commit = NULL;
 400        struct option options[] = {
 401                OPT_BOOLEAN('l', "list", &list, "list tag names"),
 402                { OPTION_INTEGER, 'n', NULL, &lines, "n",
 403                                "print <n> lines of each tag message",
 404                                PARSE_OPT_OPTARG, NULL, 1 },
 405                OPT_BOOLEAN('d', "delete", &delete, "delete tags"),
 406                OPT_BOOLEAN('v', "verify", &verify, "verify tags"),
 407
 408                OPT_GROUP("Tag creation options"),
 409                OPT_BOOLEAN('a', "annotate", &annotate,
 410                                        "annotated tag, needs a message"),
 411                OPT_CALLBACK('m', "message", &msg, "message",
 412                             "tag message", parse_msg_arg),
 413                OPT_FILENAME('F', "file", &msgfile, "read message from file"),
 414                OPT_BOOLEAN('s', "sign", &opt.sign, "annotated and GPG-signed tag"),
 415                OPT_STRING(0, "cleanup", &cleanup_arg, "mode",
 416                        "how to strip spaces and #comments from message"),
 417                OPT_STRING('u', "local-user", &keyid, "key-id",
 418                                        "use another key to sign the tag"),
 419                OPT__FORCE(&force, "replace the tag if exists"),
 420
 421                OPT_GROUP("Tag listing options"),
 422                {
 423                        OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 424                        "print only tags that contain the commit",
 425                        PARSE_OPT_LASTARG_DEFAULT,
 426                        parse_opt_with_commit, (intptr_t)"HEAD",
 427                },
 428                OPT_END()
 429        };
 430
 431        git_config(git_tag_config, NULL);
 432
 433        memset(&opt, 0, sizeof(opt));
 434
 435        argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 436
 437        if (keyid) {
 438                opt.sign = 1;
 439                set_signing_key(keyid);
 440        }
 441        if (opt.sign)
 442                annotate = 1;
 443        if (argc == 0 && !(delete || verify))
 444                list = 1;
 445
 446        if ((annotate || msg.given || msgfile || force) &&
 447            (list || delete || verify))
 448                usage_with_options(git_tag_usage, options);
 449
 450        if (list + delete + verify > 1)
 451                usage_with_options(git_tag_usage, options);
 452        if (list)
 453                return list_tags(argv, lines == -1 ? 0 : lines,
 454                                 with_commit);
 455        if (lines != -1)
 456                die(_("-n option is only allowed with -l."));
 457        if (with_commit)
 458                die(_("--contains option is only allowed with -l."));
 459        if (delete)
 460                return for_each_tag_name(argv, delete_tag);
 461        if (verify)
 462                return for_each_tag_name(argv, verify_tag);
 463
 464        if (msg.given || msgfile) {
 465                if (msg.given && msgfile)
 466                        die(_("only one -F or -m option is allowed."));
 467                annotate = 1;
 468                if (msg.given)
 469                        strbuf_addbuf(&buf, &(msg.buf));
 470                else {
 471                        if (!strcmp(msgfile, "-")) {
 472                                if (strbuf_read(&buf, 0, 1024) < 0)
 473                                        die_errno(_("cannot read '%s'"), msgfile);
 474                        } else {
 475                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 476                                        die_errno(_("could not open or read '%s'"),
 477                                                msgfile);
 478                        }
 479                }
 480        }
 481
 482        tag = argv[0];
 483
 484        object_ref = argc == 2 ? argv[1] : "HEAD";
 485        if (argc > 2)
 486                die(_("too many params"));
 487
 488        if (get_sha1(object_ref, object))
 489                die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 490
 491        if (strbuf_check_tag_ref(&ref, tag))
 492                die(_("'%s' is not a valid tag name."), tag);
 493
 494        if (read_ref(ref.buf, prev))
 495                hashclr(prev);
 496        else if (!force)
 497                die(_("tag '%s' already exists"), tag);
 498
 499        opt.message_given = msg.given || msgfile;
 500
 501        if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 502                opt.cleanup_mode = CLEANUP_ALL;
 503        else if (!strcmp(cleanup_arg, "verbatim"))
 504                opt.cleanup_mode = CLEANUP_NONE;
 505        else if (!strcmp(cleanup_arg, "whitespace"))
 506                opt.cleanup_mode = CLEANUP_SPACE;
 507        else
 508                die(_("Invalid cleanup mode %s"), cleanup_arg);
 509
 510        if (annotate)
 511                create_tag(object, tag, &buf, &opt, prev, object);
 512
 513        lock = lock_any_ref_for_update(ref.buf, prev, 0);
 514        if (!lock)
 515                die(_("%s: cannot lock the ref"), ref.buf);
 516        if (write_ref_sha1(lock, object, NULL) < 0)
 517                die(_("%s: cannot update the ref"), ref.buf);
 518        if (force && hashcmp(prev, object))
 519                printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 520
 521        strbuf_release(&buf);
 522        strbuf_release(&ref);
 523        return 0;
 524}