Andrew's git - gitweb.git/blob

   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
  18static const char * const git_tag_usage[] = {
  19        "git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
  20        "git tag -d <tagname>...",
  21        "git tag -l [-n[<num>]] [<pattern>...]",
  22        "git tag -v <tagname>...",
  23        NULL
  24};
  25
  26static char signingkey[1000];
  27
  28struct tag_filter {
  29        const char **patterns;
  30        int lines;
  31        struct commit_list *with_commit;
  32};
  33
  34static int match_pattern(const char **patterns, const char *ref)
  35{
  36        /* no pattern means match everything */
  37        if (!*patterns)
  38                return 1;
  39        for (; *patterns; patterns++)
  40                if (!fnmatch(*patterns, ref, 0))
  41                        return 1;
  42        return 0;
  43}
  44
  45static int in_commit_list(const struct commit_list *want, struct commit *c)
  46{
  47        for (; want; want = want->next)
  48                if (!hashcmp(want->item->object.sha1, c->object.sha1))
  49                        return 1;
  50        return 0;
  51}
  52
  53static int contains_recurse(struct commit *candidate,
  54                            const struct commit_list *want)
  55{
  56        struct commit_list *p;
  57
  58        /* was it previously marked as containing a want commit? */
  59        if (candidate->object.flags & TMP_MARK)
  60                return 1;
  61        /* or marked as not possibly containing a want commit? */
  62        if (candidate->object.flags & UNINTERESTING)
  63                return 0;
  64        /* or are we it? */
  65        if (in_commit_list(want, candidate))
  66                return 1;
  67
  68        if (parse_commit(candidate) < 0)
  69                return 0;
  70
  71        /* Otherwise recurse and mark ourselves for future traversals. */
  72        for (p = candidate->parents; p; p = p->next) {
  73                if (contains_recurse(p->item, want)) {
  74                        candidate->object.flags |= TMP_MARK;
  75                        return 1;
  76                }
  77        }
  78        candidate->object.flags |= UNINTERESTING;
  79        return 0;
  80}
  81
  82static int contains(struct commit *candidate, const struct commit_list *want)
  83{
  84        return contains_recurse(candidate, want);
  85}
  86
  87static int show_reference(const char *refname, const unsigned char *sha1,
  88                          int flag, void *cb_data)
  89{
  90        struct tag_filter *filter = cb_data;
  91
  92        if (match_pattern(filter->patterns, refname)) {
  93                int i;
  94                unsigned long size;
  95                enum object_type type;
  96                char *buf, *sp, *eol;
  97                size_t len;
  98
  99                if (filter->with_commit) {
 100                        struct commit *commit;
 101
 102                        commit = lookup_commit_reference_gently(sha1, 1);
 103                        if (!commit)
 104                                return 0;
 105                        if (!contains(commit, filter->with_commit))
 106                                return 0;
 107                }
 108
 109                if (!filter->lines) {
 110                        printf("%s\n", refname);
 111                        return 0;
 112                }
 113                printf("%-15s ", refname);
 114
 115                buf = read_sha1_file(sha1, &type, &size);
 116                if (!buf || !size)
 117                        return 0;
 118
 119                /* skip header */
 120                sp = strstr(buf, "\n\n");
 121                if (!sp) {
 122                        free(buf);
 123                        return 0;
 124                }
 125                /* only take up to "lines" lines, and strip the signature */
 126                size = parse_signature(buf, size);
 127                for (i = 0, sp += 2;
 128                                i < filter->lines && sp < buf + size;
 129                                i++) {
 130                        if (i)
 131                                printf("\n    ");
 132                        eol = memchr(sp, '\n', size - (sp - buf));
 133                        len = eol ? eol - sp : size - (sp - buf);
 134                        fwrite(sp, len, 1, stdout);
 135                        if (!eol)
 136                                break;
 137                        sp = eol + 1;
 138                }
 139                putchar('\n');
 140                free(buf);
 141        }
 142
 143        return 0;
 144}
 145
 146static int list_tags(const char **patterns, int lines,
 147                        struct commit_list *with_commit)
 148{
 149        struct tag_filter filter;
 150
 151        filter.patterns = patterns;
 152        filter.lines = lines;
 153        filter.with_commit = with_commit;
 154
 155        for_each_tag_ref(show_reference, (void *) &filter);
 156
 157        return 0;
 158}
 159
 160typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 161                                const unsigned char *sha1);
 162
 163static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 164{
 165        const char **p;
 166        char ref[PATH_MAX];
 167        int had_error = 0;
 168        unsigned char sha1[20];
 169
 170        for (p = argv; *p; p++) {
 171                if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 172                                        >= sizeof(ref)) {
 173                        error(_("tag name too long: %.*s..."), 50, *p);
 174                        had_error = 1;
 175                        continue;
 176                }
 177                if (!resolve_ref(ref, sha1, 1, NULL)) {
 178                        error(_("tag '%s' not found."), *p);
 179                        had_error = 1;
 180                        continue;
 181                }
 182                if (fn(*p, ref, sha1))
 183                        had_error = 1;
 184        }
 185        return had_error;
 186}
 187
 188static int delete_tag(const char *name, const char *ref,
 189                                const unsigned char *sha1)
 190{
 191        if (delete_ref(ref, sha1, 0))
 192                return 1;
 193        printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 194        return 0;
 195}
 196
 197static int verify_tag(const char *name, const char *ref,
 198                                const unsigned char *sha1)
 199{
 200        const char *argv_verify_tag[] = {"verify-tag",
 201                                        "-v", "SHA1_HEX", NULL};
 202        argv_verify_tag[2] = sha1_to_hex(sha1);
 203
 204        if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 205                return error(_("could not verify the tag '%s'"), name);
 206        return 0;
 207}
 208
 209static int do_sign(struct strbuf *buffer)
 210{
 211        struct child_process gpg;
 212        const char *args[4];
 213        char *bracket;
 214        int len;
 215        int i, j;
 216
 217        if (!*signingkey) {
 218                if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 219                                sizeof(signingkey)) > sizeof(signingkey) - 1)
 220                        return error(_("committer info too long."));
 221                bracket = strchr(signingkey, '>');
 222                if (bracket)
 223                        bracket[1] = '\0';
 224        }
 225
 226        /* When the username signingkey is bad, program could be terminated
 227         * because gpg exits without reading and then write gets SIGPIPE. */
 228        signal(SIGPIPE, SIG_IGN);
 229
 230        memset(&gpg, 0, sizeof(gpg));
 231        gpg.argv = args;
 232        gpg.in = -1;
 233        gpg.out = -1;
 234        args[0] = "gpg";
 235        args[1] = "-bsau";
 236        args[2] = signingkey;
 237        args[3] = NULL;
 238
 239        if (start_command(&gpg))
 240                return error(_("could not run gpg."));
 241
 242        if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 243                close(gpg.in);
 244                close(gpg.out);
 245                finish_command(&gpg);
 246                return error(_("gpg did not accept the tag data"));
 247        }
 248        close(gpg.in);
 249        len = strbuf_read(buffer, gpg.out, 1024);
 250        close(gpg.out);
 251
 252        if (finish_command(&gpg) || !len || len < 0)
 253                return error(_("gpg failed to sign the tag"));
 254
 255        /* Strip CR from the line endings, in case we are on Windows. */
 256        for (i = j = 0; i < buffer->len; i++)
 257                if (buffer->buf[i] != '\r') {
 258                        if (i != j)
 259                                buffer->buf[j] = buffer->buf[i];
 260                        j++;
 261                }
 262        strbuf_setlen(buffer, j);
 263
 264        return 0;
 265}
 266
 267static const char tag_template[] =
 268        N_("\n"
 269        "#\n"
 270        "# Write a tag message\n"
 271        "#\n");
 272
 273static void set_signingkey(const char *value)
 274{
 275        if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 276                die(_("signing key value too long (%.10s...)"), value);
 277}
 278
 279static int git_tag_config(const char *var, const char *value, void *cb)
 280{
 281        if (!strcmp(var, "user.signingkey")) {
 282                if (!value)
 283                        return config_error_nonbool(var);
 284                set_signingkey(value);
 285                return 0;
 286        }
 287
 288        return git_default_config(var, value, cb);
 289}
 290
 291static void write_tag_body(int fd, const unsigned char *sha1)
 292{
 293        unsigned long size;
 294        enum object_type type;
 295        char *buf, *sp;
 296
 297        buf = read_sha1_file(sha1, &type, &size);
 298        if (!buf)
 299                return;
 300        /* skip header */
 301        sp = strstr(buf, "\n\n");
 302
 303        if (!sp || !size || type != OBJ_TAG) {
 304                free(buf);
 305                return;
 306        }
 307        sp += 2; /* skip the 2 LFs */
 308        write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 309
 310        free(buf);
 311}
 312
 313static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 314{
 315        if (sign && do_sign(buf) < 0)
 316                return error(_("unable to sign the tag"));
 317        if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 318                return error(_("unable to write tag file"));
 319        return 0;
 320}
 321
 322static void create_tag(const unsigned char *object, const char *tag,
 323                       struct strbuf *buf, int message, int sign,
 324                       unsigned char *prev, unsigned char *result)
 325{
 326        enum object_type type;
 327        char header_buf[1024];
 328        int header_len;
 329        char *path = NULL;
 330
 331        type = sha1_object_info(object, NULL);
 332        if (type <= OBJ_NONE)
 333            die(_("bad object type."));
 334
 335        header_len = snprintf(header_buf, sizeof(header_buf),
 336                          "object %s\n"
 337                          "type %s\n"
 338                          "tag %s\n"
 339                          "tagger %s\n\n",
 340                          sha1_to_hex(object),
 341                          typename(type),
 342                          tag,
 343                          git_committer_info(IDENT_ERROR_ON_NO_NAME));
 344
 345        if (header_len > sizeof(header_buf) - 1)
 346                die(_("tag header too big."));
 347
 348        if (!message) {
 349                int fd;
 350
 351                /* write the template message before editing: */
 352                path = git_pathdup("TAG_EDITMSG");
 353                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 354                if (fd < 0)
 355                        die_errno(_("could not create file '%s'"), path);
 356
 357                if (!is_null_sha1(prev))
 358                        write_tag_body(fd, prev);
 359                else
 360                        write_or_die(fd, _(tag_template), strlen(_(tag_template)));
 361                close(fd);
 362
 363                if (launch_editor(path, buf, NULL)) {
 364                        fprintf(stderr,
 365                        _("Please supply the message using either -m or -F option.\n"));
 366                        exit(1);
 367                }
 368        }
 369
 370        stripspace(buf, 1);
 371
 372        if (!message && !buf->len)
 373                die(_("no tag message?"));
 374
 375        strbuf_insert(buf, 0, header_buf, header_len);
 376
 377        if (build_tag_object(buf, sign, result) < 0) {
 378                if (path)
 379                        fprintf(stderr, _("The tag message has been left in %s\n"),
 380                                path);
 381                exit(128);
 382        }
 383        if (path) {
 384                unlink_or_warn(path);
 385                free(path);
 386        }
 387}
 388
 389struct msg_arg {
 390        int given;
 391        struct strbuf buf;
 392};
 393
 394static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 395{
 396        struct msg_arg *msg = opt->value;
 397
 398        if (!arg)
 399                return -1;
 400        if (msg->buf.len)
 401                strbuf_addstr(&(msg->buf), "\n\n");
 402        strbuf_addstr(&(msg->buf), arg);
 403        msg->given = 1;
 404        return 0;
 405}
 406
 407static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 408{
 409        if (name[0] == '-')
 410                return CHECK_REF_FORMAT_ERROR;
 411
 412        strbuf_reset(sb);
 413        strbuf_addf(sb, "refs/tags/%s", name);
 414
 415        return check_ref_format(sb->buf);
 416}
 417
 418int cmd_tag(int argc, const char **argv, const char *prefix)
 419{
 420        struct strbuf buf = STRBUF_INIT;
 421        struct strbuf ref = STRBUF_INIT;
 422        unsigned char object[20], prev[20];
 423        const char *object_ref, *tag;
 424        struct ref_lock *lock;
 425
 426        int annotate = 0, sign = 0, force = 0, lines = -1,
 427                list = 0, delete = 0, verify = 0;
 428        const char *msgfile = NULL, *keyid = NULL;
 429        struct msg_arg msg = { 0, STRBUF_INIT };
 430        struct commit_list *with_commit = NULL;
 431        struct option options[] = {
 432                OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 433                { OPTION_INTEGER, 'n', NULL, &lines, "n",
 434                                "print <n> lines of each tag message",
 435                                PARSE_OPT_OPTARG, NULL, 1 },
 436                OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 437                OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 438
 439                OPT_GROUP("Tag creation options"),
 440                OPT_BOOLEAN('a', NULL, &annotate,
 441                                        "annotated tag, needs a message"),
 442                OPT_CALLBACK('m', NULL, &msg, "message",
 443                             "tag message", parse_msg_arg),
 444                OPT_FILENAME('F', NULL, &msgfile, "read message from file"),
 445                OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 446                OPT_STRING('u', NULL, &keyid, "key-id",
 447                                        "use another key to sign the tag"),
 448                OPT__FORCE(&force, "replace the tag if exists"),
 449
 450                OPT_GROUP("Tag listing options"),
 451                {
 452                        OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 453                        "print only tags that contain the commit",
 454                        PARSE_OPT_LASTARG_DEFAULT,
 455                        parse_opt_with_commit, (intptr_t)"HEAD",
 456                },
 457                OPT_END()
 458        };
 459
 460        git_config(git_tag_config, NULL);
 461
 462        argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 463
 464        if (keyid) {
 465                sign = 1;
 466                set_signingkey(keyid);
 467        }
 468        if (sign)
 469                annotate = 1;
 470        if (argc == 0 && !(delete || verify))
 471                list = 1;
 472
 473        if ((annotate || msg.given || msgfile || force) &&
 474            (list || delete || verify))
 475                usage_with_options(git_tag_usage, options);
 476
 477        if (list + delete + verify > 1)
 478                usage_with_options(git_tag_usage, options);
 479        if (list)
 480                return list_tags(argv, lines == -1 ? 0 : lines,
 481                                 with_commit);
 482        if (lines != -1)
 483                die(_("-n option is only allowed with -l."));
 484        if (with_commit)
 485                die(_("--contains option is only allowed with -l."));
 486        if (delete)
 487                return for_each_tag_name(argv, delete_tag);
 488        if (verify)
 489                return for_each_tag_name(argv, verify_tag);
 490
 491        if (msg.given || msgfile) {
 492                if (msg.given && msgfile)
 493                        die(_("only one -F or -m option is allowed."));
 494                annotate = 1;
 495                if (msg.given)
 496                        strbuf_addbuf(&buf, &(msg.buf));
 497                else {
 498                        if (!strcmp(msgfile, "-")) {
 499                                if (strbuf_read(&buf, 0, 1024) < 0)
 500                                        die_errno(_("cannot read '%s'"), msgfile);
 501                        } else {
 502                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 503                                        die_errno(_("could not open or read '%s'"),
 504                                                msgfile);
 505                        }
 506                }
 507        }
 508
 509        tag = argv[0];
 510
 511        object_ref = argc == 2 ? argv[1] : "HEAD";
 512        if (argc > 2)
 513                die(_("too many params"));
 514
 515        if (get_sha1(object_ref, object))
 516                die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 517
 518        if (strbuf_check_tag_ref(&ref, tag))
 519                die(_("'%s' is not a valid tag name."), tag);
 520
 521        if (!resolve_ref(ref.buf, prev, 1, NULL))
 522                hashclr(prev);
 523        else if (!force)
 524                die(_("tag '%s' already exists"), tag);
 525
 526        if (annotate)
 527                create_tag(object, tag, &buf, msg.given || msgfile,
 528                           sign, prev, object);
 529
 530        lock = lock_any_ref_for_update(ref.buf, prev, 0);
 531        if (!lock)
 532                die(_("%s: cannot lock the ref"), ref.buf);
 533        if (write_ref_sha1(lock, object, NULL) < 0)
 534                die(_("%s: cannot update the ref"), ref.buf);
 535        if (force && hashcmp(prev, object))
 536                printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 537
 538        strbuf_release(&buf);
 539        strbuf_release(&ref);
 540        return 0;
 541}