Andrew's git / gitweb.git / builtin/tag.c
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builtin / tag.con commit shallow: automatically clean up shallow tempfiles (0179c94)
   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
  30struct tag_filter {
  31        const char **patterns;
  32        int lines;
  33        struct commit_list *with_commit;
  34};
  35
  36static struct sha1_array points_at;
  37static unsigned int colopts;
  38
  39static int match_pattern(const char **patterns, const char *ref)
  40{
  41        /* no pattern means match everything */
  42        if (!*patterns)
  43                return 1;
  44        for (; *patterns; patterns++)
  45                if (!fnmatch(*patterns, ref, 0))
  46                        return 1;
  47        return 0;
  48}
  49
  50static const unsigned char *match_points_at(const char *refname,
  51                                            const unsigned char *sha1)
  52{
  53        const unsigned char *tagged_sha1 = NULL;
  54        struct object *obj;
  55
  56        if (sha1_array_lookup(&points_at, sha1) >= 0)
  57                return sha1;
  58        obj = parse_object(sha1);
  59        if (!obj)
  60                die(_("malformed object at '%s'"), refname);
  61        if (obj->type == OBJ_TAG)
  62                tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
  63        if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
  64                return tagged_sha1;
  65        return NULL;
  66}
  67
  68static int in_commit_list(const struct commit_list *want, struct commit *c)
  69{
  70        for (; want; want = want->next)
  71                if (!hashcmp(want->item->object.sha1, c->object.sha1))
  72                        return 1;
  73        return 0;
  74}
  75
  76static int contains_recurse(struct commit *candidate,
  77                            const struct commit_list *want)
  78{
  79        struct commit_list *p;
  80
  81        /* was it previously marked as containing a want commit? */
  82        if (candidate->object.flags & TMP_MARK)
  83                return 1;
  84        /* or marked as not possibly containing a want commit? */
  85        if (candidate->object.flags & UNINTERESTING)
  86                return 0;
  87        /* or are we it? */
  88        if (in_commit_list(want, candidate))
  89                return 1;
  90
  91        if (parse_commit(candidate) < 0)
  92                return 0;
  93
  94        /* Otherwise recurse and mark ourselves for future traversals. */
  95        for (p = candidate->parents; p; p = p->next) {
  96                if (contains_recurse(p->item, want)) {
  97                        candidate->object.flags |= TMP_MARK;
  98                        return 1;
  99                }
 100        }
 101        candidate->object.flags |= UNINTERESTING;
 102        return 0;
 103}
 104
 105static int contains(struct commit *candidate, const struct commit_list *want)
 106{
 107        return contains_recurse(candidate, want);
 108}
 109
 110static void show_tag_lines(const unsigned char *sha1, int lines)
 111{
 112        int i;
 113        unsigned long size;
 114        enum object_type type;
 115        char *buf, *sp, *eol;
 116        size_t len;
 117
 118        buf = read_sha1_file(sha1, &type, &size);
 119        if (!buf)
 120                die_errno("unable to read object %s", sha1_to_hex(sha1));
 121        if (type != OBJ_COMMIT && type != OBJ_TAG)
 122                goto free_return;
 123        if (!size)
 124                die("an empty %s object %s?",
 125                    typename(type), sha1_to_hex(sha1));
 126
 127        /* skip header */
 128        sp = strstr(buf, "\n\n");
 129        if (!sp)
 130                goto free_return;
 131
 132        /* only take up to "lines" lines, and strip the signature from a tag */
 133        if (type == OBJ_TAG)
 134                size = parse_signature(buf, size);
 135        for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
 136                if (i)
 137                        printf("\n    ");
 138                eol = memchr(sp, '\n', size - (sp - buf));
 139                len = eol ? eol - sp : size - (sp - buf);
 140                fwrite(sp, len, 1, stdout);
 141                if (!eol)
 142                        break;
 143                sp = eol + 1;
 144        }
 145free_return:
 146        free(buf);
 147}
 148
 149static int show_reference(const char *refname, const unsigned char *sha1,
 150                          int flag, void *cb_data)
 151{
 152        struct tag_filter *filter = cb_data;
 153
 154        if (match_pattern(filter->patterns, refname)) {
 155                if (filter->with_commit) {
 156                        struct commit *commit;
 157
 158                        commit = lookup_commit_reference_gently(sha1, 1);
 159                        if (!commit)
 160                                return 0;
 161                        if (!contains(commit, filter->with_commit))
 162                                return 0;
 163                }
 164
 165                if (points_at.nr && !match_points_at(refname, sha1))
 166                        return 0;
 167
 168                if (!filter->lines) {
 169                        printf("%s\n", refname);
 170                        return 0;
 171                }
 172                printf("%-15s ", refname);
 173                show_tag_lines(sha1, filter->lines);
 174                putchar('\n');
 175        }
 176
 177        return 0;
 178}
 179
 180static int list_tags(const char **patterns, int lines,
 181                        struct commit_list *with_commit)
 182{
 183        struct tag_filter filter;
 184
 185        filter.patterns = patterns;
 186        filter.lines = lines;
 187        filter.with_commit = with_commit;
 188
 189        for_each_tag_ref(show_reference, (void *) &filter);
 190
 191        return 0;
 192}
 193
 194typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 195                                const unsigned char *sha1);
 196
 197static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 198{
 199        const char **p;
 200        char ref[PATH_MAX];
 201        int had_error = 0;
 202        unsigned char sha1[20];
 203
 204        for (p = argv; *p; p++) {
 205                if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 206                                        >= sizeof(ref)) {
 207                        error(_("tag name too long: %.*s..."), 50, *p);
 208                        had_error = 1;
 209                        continue;
 210                }
 211                if (read_ref(ref, sha1)) {
 212                        error(_("tag '%s' not found."), *p);
 213                        had_error = 1;
 214                        continue;
 215                }
 216                if (fn(*p, ref, sha1))
 217                        had_error = 1;
 218        }
 219        return had_error;
 220}
 221
 222static int delete_tag(const char *name, const char *ref,
 223                                const unsigned char *sha1)
 224{
 225        if (delete_ref(ref, sha1, 0))
 226                return 1;
 227        printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 228        return 0;
 229}
 230
 231static int verify_tag(const char *name, const char *ref,
 232                                const unsigned char *sha1)
 233{
 234        const char *argv_verify_tag[] = {"verify-tag",
 235                                        "-v", "SHA1_HEX", NULL};
 236        argv_verify_tag[2] = sha1_to_hex(sha1);
 237
 238        if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 239                return error(_("could not verify the tag '%s'"), name);
 240        return 0;
 241}
 242
 243static int do_sign(struct strbuf *buffer)
 244{
 245        return sign_buffer(buffer, buffer, get_signing_key());
 246}
 247
 248static const char tag_template[] =
 249        N_("\nWrite a tag message\n"
 250        "Lines starting with '%c' will be ignored.\n");
 251
 252static const char tag_template_nocleanup[] =
 253        N_("\nWrite a tag message\n"
 254        "Lines starting with '%c' will be kept; you may remove them"
 255        " yourself if you want to.\n");
 256
 257static int git_tag_config(const char *var, const char *value, void *cb)
 258{
 259        int status = git_gpg_config(var, value, cb);
 260        if (status)
 261                return status;
 262        if (starts_with(var, "column."))
 263                return git_column_config(var, value, "tag", &colopts);
 264        return git_default_config(var, value, cb);
 265}
 266
 267static void write_tag_body(int fd, const unsigned char *sha1)
 268{
 269        unsigned long size;
 270        enum object_type type;
 271        char *buf, *sp;
 272
 273        buf = read_sha1_file(sha1, &type, &size);
 274        if (!buf)
 275                return;
 276        /* skip header */
 277        sp = strstr(buf, "\n\n");
 278
 279        if (!sp || !size || type != OBJ_TAG) {
 280                free(buf);
 281                return;
 282        }
 283        sp += 2; /* skip the 2 LFs */
 284        write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 285
 286        free(buf);
 287}
 288
 289static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 290{
 291        if (sign && do_sign(buf) < 0)
 292                return error(_("unable to sign the tag"));
 293        if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 294                return error(_("unable to write tag file"));
 295        return 0;
 296}
 297
 298struct create_tag_options {
 299        unsigned int message_given:1;
 300        unsigned int sign;
 301        enum {
 302                CLEANUP_NONE,
 303                CLEANUP_SPACE,
 304                CLEANUP_ALL
 305        } cleanup_mode;
 306};
 307
 308static void create_tag(const unsigned char *object, const char *tag,
 309                       struct strbuf *buf, struct create_tag_options *opt,
 310                       unsigned char *prev, unsigned char *result)
 311{
 312        enum object_type type;
 313        char header_buf[1024];
 314        int header_len;
 315        char *path = NULL;
 316
 317        type = sha1_object_info(object, NULL);
 318        if (type <= OBJ_NONE)
 319            die(_("bad object type."));
 320
 321        header_len = snprintf(header_buf, sizeof(header_buf),
 322                          "object %s\n"
 323                          "type %s\n"
 324                          "tag %s\n"
 325                          "tagger %s\n\n",
 326                          sha1_to_hex(object),
 327                          typename(type),
 328                          tag,
 329                          git_committer_info(IDENT_STRICT));
 330
 331        if (header_len > sizeof(header_buf) - 1)
 332                die(_("tag header too big."));
 333
 334        if (!opt->message_given) {
 335                int fd;
 336
 337                /* write the template message before editing: */
 338                path = git_pathdup("TAG_EDITMSG");
 339                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 340                if (fd < 0)
 341                        die_errno(_("could not create file '%s'"), path);
 342
 343                if (!is_null_sha1(prev)) {
 344                        write_tag_body(fd, prev);
 345                } else {
 346                        struct strbuf buf = STRBUF_INIT;
 347                        strbuf_addch(&buf, '\n');
 348                        if (opt->cleanup_mode == CLEANUP_ALL)
 349                                strbuf_commented_addf(&buf, _(tag_template), comment_line_char);
 350                        else
 351                                strbuf_commented_addf(&buf, _(tag_template_nocleanup), comment_line_char);
 352                        write_or_die(fd, buf.buf, buf.len);
 353                        strbuf_release(&buf);
 354                }
 355                close(fd);
 356
 357                if (launch_editor(path, buf, NULL)) {
 358                        fprintf(stderr,
 359                        _("Please supply the message using either -m or -F option.\n"));
 360                        exit(1);
 361                }
 362        }
 363
 364        if (opt->cleanup_mode != CLEANUP_NONE)
 365                stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 366
 367        if (!opt->message_given && !buf->len)
 368                die(_("no tag message?"));
 369
 370        strbuf_insert(buf, 0, header_buf, header_len);
 371
 372        if (build_tag_object(buf, opt->sign, result) < 0) {
 373                if (path)
 374                        fprintf(stderr, _("The tag message has been left in %s\n"),
 375                                path);
 376                exit(128);
 377        }
 378        if (path) {
 379                unlink_or_warn(path);
 380                free(path);
 381        }
 382}
 383
 384struct msg_arg {
 385        int given;
 386        struct strbuf buf;
 387};
 388
 389static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 390{
 391        struct msg_arg *msg = opt->value;
 392
 393        if (!arg)
 394                return -1;
 395        if (msg->buf.len)
 396                strbuf_addstr(&(msg->buf), "\n\n");
 397        strbuf_addstr(&(msg->buf), arg);
 398        msg->given = 1;
 399        return 0;
 400}
 401
 402static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 403{
 404        if (name[0] == '-')
 405                return -1;
 406
 407        strbuf_reset(sb);
 408        strbuf_addf(sb, "refs/tags/%s", name);
 409
 410        return check_refname_format(sb->buf, 0);
 411}
 412
 413static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
 414                        const char *arg, int unset)
 415{
 416        unsigned char sha1[20];
 417
 418        if (unset) {
 419                sha1_array_clear(&points_at);
 420                return 0;
 421        }
 422        if (!arg)
 423                return error(_("switch 'points-at' requires an object"));
 424        if (get_sha1(arg, sha1))
 425                return error(_("malformed object name '%s'"), arg);
 426        sha1_array_append(&points_at, sha1);
 427        return 0;
 428}
 429
 430int cmd_tag(int argc, const char **argv, const char *prefix)
 431{
 432        struct strbuf buf = STRBUF_INIT;
 433        struct strbuf ref = STRBUF_INIT;
 434        unsigned char object[20], prev[20];
 435        const char *object_ref, *tag;
 436        struct ref_lock *lock;
 437        struct create_tag_options opt;
 438        char *cleanup_arg = NULL;
 439        int annotate = 0, force = 0, lines = -1;
 440        int cmdmode = 0;
 441        const char *msgfile = NULL, *keyid = NULL;
 442        struct msg_arg msg = { 0, STRBUF_INIT };
 443        struct commit_list *with_commit = NULL;
 444        struct option options[] = {
 445                OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 446                { OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
 447                                N_("print <n> lines of each tag message"),
 448                                PARSE_OPT_OPTARG, NULL, 1 },
 449                OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 450                OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 451
 452                OPT_GROUP(N_("Tag creation options")),
 453                OPT_BOOL('a', "annotate", &annotate,
 454                                        N_("annotated tag, needs a message")),
 455                OPT_CALLBACK('m', "message", &msg, N_("message"),
 456                             N_("tag message"), parse_msg_arg),
 457                OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 458                OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 459                OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 460                        N_("how to strip spaces and #comments from message")),
 461                OPT_STRING('u', "local-user", &keyid, N_("key id"),
 462                                        N_("use another key to sign the tag")),
 463                OPT__FORCE(&force, N_("replace the tag if exists")),
 464                OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 465
 466                OPT_GROUP(N_("Tag listing options")),
 467                {
 468                        OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
 469                        N_("print only tags that contain the commit"),
 470                        PARSE_OPT_LASTARG_DEFAULT,
 471                        parse_opt_with_commit, (intptr_t)"HEAD",
 472                },
 473                {
 474                        OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
 475                        N_("print only tags of the object"), 0, parse_opt_points_at
 476                },
 477                OPT_END()
 478        };
 479
 480        git_config(git_tag_config, NULL);
 481
 482        memset(&opt, 0, sizeof(opt));
 483
 484        argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 485
 486        if (keyid) {
 487                opt.sign = 1;
 488                set_signing_key(keyid);
 489        }
 490        if (opt.sign)
 491                annotate = 1;
 492        if (argc == 0 && !cmdmode)
 493                cmdmode = 'l';
 494
 495        if ((annotate || msg.given || msgfile || force) && (cmdmode != 0))
 496                usage_with_options(git_tag_usage, options);
 497
 498        finalize_colopts(&colopts, -1);
 499        if (cmdmode == 'l' && lines != -1) {
 500                if (explicitly_enable_column(colopts))
 501                        die(_("--column and -n are incompatible"));
 502                colopts = 0;
 503        }
 504        if (cmdmode == 'l') {
 505                int ret;
 506                if (column_active(colopts)) {
 507                        struct column_options copts;
 508                        memset(&copts, 0, sizeof(copts));
 509                        copts.padding = 2;
 510                        run_column_filter(colopts, &copts);
 511                }
 512                ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit);
 513                if (column_active(colopts))
 514                        stop_column_filter();
 515                return ret;
 516        }
 517        if (lines != -1)
 518                die(_("-n option is only allowed with -l."));
 519        if (with_commit)
 520                die(_("--contains option is only allowed with -l."));
 521        if (points_at.nr)
 522                die(_("--points-at option is only allowed with -l."));
 523        if (cmdmode == 'd')
 524                return for_each_tag_name(argv, delete_tag);
 525        if (cmdmode == 'v')
 526                return for_each_tag_name(argv, verify_tag);
 527
 528        if (msg.given || msgfile) {
 529                if (msg.given && msgfile)
 530                        die(_("only one -F or -m option is allowed."));
 531                annotate = 1;
 532                if (msg.given)
 533                        strbuf_addbuf(&buf, &(msg.buf));
 534                else {
 535                        if (!strcmp(msgfile, "-")) {
 536                                if (strbuf_read(&buf, 0, 1024) < 0)
 537                                        die_errno(_("cannot read '%s'"), msgfile);
 538                        } else {
 539                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 540                                        die_errno(_("could not open or read '%s'"),
 541                                                msgfile);
 542                        }
 543                }
 544        }
 545
 546        tag = argv[0];
 547
 548        object_ref = argc == 2 ? argv[1] : "HEAD";
 549        if (argc > 2)
 550                die(_("too many params"));
 551
 552        if (get_sha1(object_ref, object))
 553                die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 554
 555        if (strbuf_check_tag_ref(&ref, tag))
 556                die(_("'%s' is not a valid tag name."), tag);
 557
 558        if (read_ref(ref.buf, prev))
 559                hashclr(prev);
 560        else if (!force)
 561                die(_("tag '%s' already exists"), tag);
 562
 563        opt.message_given = msg.given || msgfile;
 564
 565        if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 566                opt.cleanup_mode = CLEANUP_ALL;
 567        else if (!strcmp(cleanup_arg, "verbatim"))
 568                opt.cleanup_mode = CLEANUP_NONE;
 569        else if (!strcmp(cleanup_arg, "whitespace"))
 570                opt.cleanup_mode = CLEANUP_SPACE;
 571        else
 572                die(_("Invalid cleanup mode %s"), cleanup_arg);
 573
 574        if (annotate)
 575                create_tag(object, tag, &buf, &opt, prev, object);
 576
 577        lock = lock_any_ref_for_update(ref.buf, prev, 0, NULL);
 578        if (!lock)
 579                die(_("%s: cannot lock the ref"), ref.buf);
 580        if (write_ref_sha1(lock, object, NULL) < 0)
 581                die(_("%s: cannot update the ref"), ref.buf);
 582        if (force && !is_null_sha1(prev) && hashcmp(prev, object))
 583                printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 584
 585        strbuf_release(&buf);
 586        strbuf_release(&ref);
 587        return 0;
 588}