builtin/tag.c

   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
  21 static const char * const git_tag_usage[] = {
  22         "git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
  23         "git tag -d <tagname>...",
  24         "git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
  25                 "\n\t\t[<pattern>...]",
  26         "git tag -v <tagname>...",
  27         NULL
  28 };
  29
  30 struct tag_filter {
  31         const char **patterns;
  32         int lines;
  33         struct commit_list *with_commit;
  34 };
  35
  36 static struct sha1_array points_at;
  37 static unsigned int colopts;
  38
  39 static 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
  50 static 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
  68 static 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
  76 static 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
 105 static int contains(struct commit *candidate, const struct commit_list *want)
 106 {
 107         return contains_recurse(candidate, want);
 108 }
 109
 110 static 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         }
 145 free_return:
 146         free(buf);
 147 }
 148
 149 static 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
 180 static 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
 194 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 195                                 const unsigned char *sha1);
 196
 197 static 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
 222 static 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
 231 static 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
 243 static int do_sign(struct strbuf *buffer)
 244 {
 245         return sign_buffer(buffer, buffer, get_signing_key());
 246 }
 247
 248 static const char tag_template[] =
 249         N_("\n"
 250         "#\n"
 251         "# Write a tag message\n"
 252         "# Lines starting with '#' will be ignored.\n"
 253         "#\n");
 254
 255 static const char tag_template_nocleanup[] =
 256         N_("\n"
 257         "#\n"
 258         "# Write a tag message\n"
 259         "# Lines starting with '#' will be kept; you may remove them"
 260         " yourself if you want to.\n"
 261         "#\n");
 262
 263 static int git_tag_config(const char *var, const char *value, void *cb)
 264 {
 265         int status = git_gpg_config(var, value, cb);
 266         if (status)
 267                 return status;
 268         if (!prefixcmp(var, "column."))
 269                 return git_column_config(var, value, "tag", &colopts);
 270         return git_default_config(var, value, cb);
 271 }
 272
 273 static void write_tag_body(int fd, const unsigned char *sha1)
 274 {
 275         unsigned long size;
 276         enum object_type type;
 277         char *buf, *sp;
 278
 279         buf = read_sha1_file(sha1, &type, &size);
 280         if (!buf)
 281                 return;
 282         /* skip header */
 283         sp = strstr(buf, "\n\n");
 284
 285         if (!sp || !size || type != OBJ_TAG) {
 286                 free(buf);
 287                 return;
 288         }
 289         sp += 2; /* skip the 2 LFs */
 290         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 291
 292         free(buf);
 293 }
 294
 295 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 296 {
 297         if (sign && do_sign(buf) < 0)
 298                 return error(_("unable to sign the tag"));
 299         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 300                 return error(_("unable to write tag file"));
 301         return 0;
 302 }
 303
 304 struct create_tag_options {
 305         unsigned int message_given:1;
 306         unsigned int sign;
 307         enum {
 308                 CLEANUP_NONE,
 309                 CLEANUP_SPACE,
 310                 CLEANUP_ALL
 311         } cleanup_mode;
 312 };
 313
 314 static void create_tag(const unsigned char *object, const char *tag,
 315                        struct strbuf *buf, struct create_tag_options *opt,
 316                        unsigned char *prev, unsigned char *result)
 317 {
 318         enum object_type type;
 319         char header_buf[1024];
 320         int header_len;
 321         char *path = NULL;
 322
 323         type = sha1_object_info(object, NULL);
 324         if (type <= OBJ_NONE)
 325             die(_("bad object type."));
 326
 327         header_len = snprintf(header_buf, sizeof(header_buf),
 328                           "object %s\n"
 329                           "type %s\n"
 330                           "tag %s\n"
 331                           "tagger %s\n\n",
 332                           sha1_to_hex(object),
 333                           typename(type),
 334                           tag,
 335                           git_committer_info(IDENT_STRICT));
 336
 337         if (header_len > sizeof(header_buf) - 1)
 338                 die(_("tag header too big."));
 339
 340         if (!opt->message_given) {
 341                 int fd;
 342
 343                 /* write the template message before editing: */
 344                 path = git_pathdup("TAG_EDITMSG");
 345                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 346                 if (fd < 0)
 347                         die_errno(_("could not create file '%s'"), path);
 348
 349                 if (!is_null_sha1(prev))
 350                         write_tag_body(fd, prev);
 351                 else if (opt->cleanup_mode == CLEANUP_ALL)
 352                         write_or_die(fd, _(tag_template),
 353                                         strlen(_(tag_template)));
 354                 else
 355                         write_or_die(fd, _(tag_template_nocleanup),
 356                                         strlen(_(tag_template_nocleanup)));
 357                 close(fd);
 358
 359                 if (launch_editor(path, buf, NULL)) {
 360                         fprintf(stderr,
 361                         _("Please supply the message using either -m or -F option.\n"));
 362                         exit(1);
 363                 }
 364         }
 365
 366         if (opt->cleanup_mode != CLEANUP_NONE)
 367                 stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 368
 369         if (!opt->message_given && !buf->len)
 370                 die(_("no tag message?"));
 371
 372         strbuf_insert(buf, 0, header_buf, header_len);
 373
 374         if (build_tag_object(buf, opt->sign, result) < 0) {
 375                 if (path)
 376                         fprintf(stderr, _("The tag message has been left in %s\n"),
 377                                 path);
 378                 exit(128);
 379         }
 380         if (path) {
 381                 unlink_or_warn(path);
 382                 free(path);
 383         }
 384 }
 385
 386 struct msg_arg {
 387         int given;
 388         struct strbuf buf;
 389 };
 390
 391 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 392 {
 393         struct msg_arg *msg = opt->value;
 394
 395         if (!arg)
 396                 return -1;
 397         if (msg->buf.len)
 398                 strbuf_addstr(&(msg->buf), "\n\n");
 399         strbuf_addstr(&(msg->buf), arg);
 400         msg->given = 1;
 401         return 0;
 402 }
 403
 404 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 405 {
 406         if (name[0] == '-')
 407                 return -1;
 408
 409         strbuf_reset(sb);
 410         strbuf_addf(sb, "refs/tags/%s", name);
 411
 412         return check_refname_format(sb->buf, 0);
 413 }
 414
 415 static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
 416                         const char *arg, int unset)
 417 {
 418         unsigned char sha1[20];
 419
 420         if (unset) {
 421                 sha1_array_clear(&points_at);
 422                 return 0;
 423         }
 424         if (!arg)
 425                 return error(_("switch 'points-at' requires an object"));
 426         if (get_sha1(arg, sha1))
 427                 return error(_("malformed object name '%s'"), arg);
 428         sha1_array_append(&points_at, sha1);
 429         return 0;
 430 }
 431
 432 int cmd_tag(int argc, const char **argv, const char *prefix)
 433 {
 434         struct strbuf buf = STRBUF_INIT;
 435         struct strbuf ref = STRBUF_INIT;
 436         unsigned char object[20], prev[20];
 437         const char *object_ref, *tag;
 438         struct ref_lock *lock;
 439         struct create_tag_options opt;
 440         char *cleanup_arg = NULL;
 441         int annotate = 0, force = 0, lines = -1, list = 0,
 442                 delete = 0, verify = 0;
 443         const char *msgfile = NULL, *keyid = NULL;
 444         struct msg_arg msg = { 0, STRBUF_INIT };
 445         struct commit_list *with_commit = NULL;
 446         struct option options[] = {
 447                 OPT_BOOLEAN('l', "list", &list, "list tag names"),
 448                 { OPTION_INTEGER, 'n', NULL, &lines, "n",
 449                                 "print <n> lines of each tag message",
 450                                 PARSE_OPT_OPTARG, NULL, 1 },
 451                 OPT_BOOLEAN('d', "delete", &delete, "delete tags"),
 452                 OPT_BOOLEAN('v', "verify", &verify, "verify tags"),
 453
 454                 OPT_GROUP("Tag creation options"),
 455                 OPT_BOOLEAN('a', "annotate", &annotate,
 456                                         "annotated tag, needs a message"),
 457                 OPT_CALLBACK('m', "message", &msg, "message",
 458                              "tag message", parse_msg_arg),
 459                 OPT_FILENAME('F', "file", &msgfile, "read message from file"),
 460                 OPT_BOOLEAN('s', "sign", &opt.sign, "annotated and GPG-signed tag"),
 461                 OPT_STRING(0, "cleanup", &cleanup_arg, "mode",
 462                         "how to strip spaces and #comments from message"),
 463                 OPT_STRING('u', "local-user", &keyid, "key-id",
 464                                         "use another key to sign the tag"),
 465                 OPT__FORCE(&force, "replace the tag if exists"),
 466                 OPT_COLUMN(0, "column", &colopts, "show tag list in columns"),
 467
 468                 OPT_GROUP("Tag listing options"),
 469                 {
 470                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 471                         "print only tags that contain the commit",
 472                         PARSE_OPT_LASTARG_DEFAULT,
 473                         parse_opt_with_commit, (intptr_t)"HEAD",
 474                 },
 475                 {
 476                         OPTION_CALLBACK, 0, "points-at", NULL, "object",
 477                         "print only tags of the object", 0, parse_opt_points_at
 478                 },
 479                 OPT_END()
 480         };
 481
 482         git_config(git_tag_config, NULL);
 483
 484         memset(&opt, 0, sizeof(opt));
 485
 486         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 487
 488         if (keyid) {
 489                 opt.sign = 1;
 490                 set_signing_key(keyid);
 491         }
 492         if (opt.sign)
 493                 annotate = 1;
 494         if (argc == 0 && !(delete || verify))
 495                 list = 1;
 496
 497         if ((annotate || msg.given || msgfile || force) &&
 498             (list || delete || verify))
 499                 usage_with_options(git_tag_usage, options);
 500
 501         if (list + delete + verify > 1)
 502                 usage_with_options(git_tag_usage, options);
 503         finalize_colopts(&colopts, -1);
 504         if (list && lines != -1) {
 505                 if (explicitly_enable_column(colopts))
 506                         die(_("--column and -n are incompatible"));
 507                 colopts = 0;
 508         }
 509         if (list) {
 510                 int ret;
 511                 if (column_active(colopts)) {
 512                         struct column_options copts;
 513                         memset(&copts, 0, sizeof(copts));
 514                         copts.padding = 2;
 515                         run_column_filter(colopts, &copts);
 516                 }
 517                 ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit);
 518                 if (column_active(colopts))
 519                         stop_column_filter();
 520                 return ret;
 521         }
 522         if (lines != -1)
 523                 die(_("-n option is only allowed with -l."));
 524         if (with_commit)
 525                 die(_("--contains option is only allowed with -l."));
 526         if (points_at.nr)
 527                 die(_("--points-at option is only allowed with -l."));
 528         if (delete)
 529                 return for_each_tag_name(argv, delete_tag);
 530         if (verify)
 531                 return for_each_tag_name(argv, verify_tag);
 532
 533         if (msg.given || msgfile) {
 534                 if (msg.given && msgfile)
 535                         die(_("only one -F or -m option is allowed."));
 536                 annotate = 1;
 537                 if (msg.given)
 538                         strbuf_addbuf(&buf, &(msg.buf));
 539                 else {
 540                         if (!strcmp(msgfile, "-")) {
 541                                 if (strbuf_read(&buf, 0, 1024) < 0)
 542                                         die_errno(_("cannot read '%s'"), msgfile);
 543                         } else {
 544                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 545                                         die_errno(_("could not open or read '%s'"),
 546                                                 msgfile);
 547                         }
 548                 }
 549         }
 550
 551         tag = argv[0];
 552
 553         object_ref = argc == 2 ? argv[1] : "HEAD";
 554         if (argc > 2)
 555                 die(_("too many params"));
 556
 557         if (get_sha1(object_ref, object))
 558                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 559
 560         if (strbuf_check_tag_ref(&ref, tag))
 561                 die(_("'%s' is not a valid tag name."), tag);
 562
 563         if (read_ref(ref.buf, prev))
 564                 hashclr(prev);
 565         else if (!force)
 566                 die(_("tag '%s' already exists"), tag);
 567
 568         opt.message_given = msg.given || msgfile;
 569
 570         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 571                 opt.cleanup_mode = CLEANUP_ALL;
 572         else if (!strcmp(cleanup_arg, "verbatim"))
 573                 opt.cleanup_mode = CLEANUP_NONE;
 574         else if (!strcmp(cleanup_arg, "whitespace"))
 575                 opt.cleanup_mode = CLEANUP_SPACE;
 576         else
 577                 die(_("Invalid cleanup mode %s"), cleanup_arg);
 578
 579         if (annotate)
 580                 create_tag(object, tag, &buf, &opt, prev, object);
 581
 582         lock = lock_any_ref_for_update(ref.buf, prev, 0);
 583         if (!lock)
 584                 die(_("%s: cannot lock the ref"), ref.buf);
 585         if (write_ref_sha1(lock, object, NULL) < 0)
 586                 die(_("%s: cannot update the ref"), ref.buf);
 587         if (force && hashcmp(prev, object))
 588                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 589
 590         strbuf_release(&buf);
 591         strbuf_release(&ref);
 592         return 0;
 593 }