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
  20 static const char * const git_tag_usage[] = {
  21         "git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
  22         "git tag -d <tagname>...",
  23         "git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
  24                 "\n\t\t[<pattern>...]",
  25         "git tag -v <tagname>...",
  26         NULL
  27 };
  28
  29 struct tag_filter {
  30         const char **patterns;
  31         int lines;
  32         struct commit_list *with_commit;
  33 };
  34
  35 static struct sha1_array points_at;
  36
  37 static int match_pattern(const char **patterns, const char *ref)
  38 {
  39         /* no pattern means match everything */
  40         if (!*patterns)
  41                 return 1;
  42         for (; *patterns; patterns++)
  43                 if (!fnmatch(*patterns, ref, 0))
  44                         return 1;
  45         return 0;
  46 }
  47
  48 static const unsigned char *match_points_at(const char *refname,
  49                                             const unsigned char *sha1)
  50 {
  51         const unsigned char *tagged_sha1 = NULL;
  52         struct object *obj;
  53
  54         if (sha1_array_lookup(&points_at, sha1) >= 0)
  55                 return sha1;
  56         obj = parse_object(sha1);
  57         if (!obj)
  58                 die(_("malformed object at '%s'"), refname);
  59         if (obj->type == OBJ_TAG)
  60                 tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
  61         if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
  62                 return tagged_sha1;
  63         return NULL;
  64 }
  65
  66 static int in_commit_list(const struct commit_list *want, struct commit *c)
  67 {
  68         for (; want; want = want->next)
  69                 if (!hashcmp(want->item->object.sha1, c->object.sha1))
  70                         return 1;
  71         return 0;
  72 }
  73
  74 static int contains_recurse(struct commit *candidate,
  75                             const struct commit_list *want)
  76 {
  77         struct commit_list *p;
  78
  79         /* was it previously marked as containing a want commit? */
  80         if (candidate->object.flags & TMP_MARK)
  81                 return 1;
  82         /* or marked as not possibly containing a want commit? */
  83         if (candidate->object.flags & UNINTERESTING)
  84                 return 0;
  85         /* or are we it? */
  86         if (in_commit_list(want, candidate))
  87                 return 1;
  88
  89         if (parse_commit(candidate) < 0)
  90                 return 0;
  91
  92         /* Otherwise recurse and mark ourselves for future traversals. */
  93         for (p = candidate->parents; p; p = p->next) {
  94                 if (contains_recurse(p->item, want)) {
  95                         candidate->object.flags |= TMP_MARK;
  96                         return 1;
  97                 }
  98         }
  99         candidate->object.flags |= UNINTERESTING;
 100         return 0;
 101 }
 102
 103 static int contains(struct commit *candidate, const struct commit_list *want)
 104 {
 105         return contains_recurse(candidate, want);
 106 }
 107
 108 static void show_tag_lines(const unsigned char *sha1, int lines)
 109 {
 110         int i;
 111         unsigned long size;
 112         enum object_type type;
 113         char *buf, *sp, *eol;
 114         size_t len;
 115
 116         buf = read_sha1_file(sha1, &type, &size);
 117         if (!buf)
 118                 die_errno("unable to read object %s", sha1_to_hex(sha1));
 119         if (type != OBJ_COMMIT && type != OBJ_TAG)
 120                 goto free_return;
 121         if (!size)
 122                 die("an empty %s object %s?",
 123                     typename(type), sha1_to_hex(sha1));
 124
 125         /* skip header */
 126         sp = strstr(buf, "\n\n");
 127         if (!sp)
 128                 goto free_return;
 129
 130         /* only take up to "lines" lines, and strip the signature from a tag */
 131         if (type == OBJ_TAG)
 132                 size = parse_signature(buf, size);
 133         for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
 134                 if (i)
 135                         printf("\n    ");
 136                 eol = memchr(sp, '\n', size - (sp - buf));
 137                 len = eol ? eol - sp : size - (sp - buf);
 138                 fwrite(sp, len, 1, stdout);
 139                 if (!eol)
 140                         break;
 141                 sp = eol + 1;
 142         }
 143 free_return:
 144         free(buf);
 145 }
 146
 147 static int show_reference(const char *refname, const unsigned char *sha1,
 148                           int flag, void *cb_data)
 149 {
 150         struct tag_filter *filter = cb_data;
 151
 152         if (match_pattern(filter->patterns, refname)) {
 153                 if (filter->with_commit) {
 154                         struct commit *commit;
 155
 156                         commit = lookup_commit_reference_gently(sha1, 1);
 157                         if (!commit)
 158                                 return 0;
 159                         if (!contains(commit, filter->with_commit))
 160                                 return 0;
 161                 }
 162
 163                 if (points_at.nr && !match_points_at(refname, sha1))
 164                         return 0;
 165
 166                 if (!filter->lines) {
 167                         printf("%s\n", refname);
 168                         return 0;
 169                 }
 170                 printf("%-15s ", refname);
 171                 show_tag_lines(sha1, filter->lines);
 172                 putchar('\n');
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int list_tags(const char **patterns, int lines,
 179                         struct commit_list *with_commit)
 180 {
 181         struct tag_filter filter;
 182
 183         filter.patterns = patterns;
 184         filter.lines = lines;
 185         filter.with_commit = with_commit;
 186
 187         for_each_tag_ref(show_reference, (void *) &filter);
 188
 189         return 0;
 190 }
 191
 192 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 193                                 const unsigned char *sha1);
 194
 195 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 196 {
 197         const char **p;
 198         char ref[PATH_MAX];
 199         int had_error = 0;
 200         unsigned char sha1[20];
 201
 202         for (p = argv; *p; p++) {
 203                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 204                                         >= sizeof(ref)) {
 205                         error(_("tag name too long: %.*s..."), 50, *p);
 206                         had_error = 1;
 207                         continue;
 208                 }
 209                 if (read_ref(ref, sha1)) {
 210                         error(_("tag '%s' not found."), *p);
 211                         had_error = 1;
 212                         continue;
 213                 }
 214                 if (fn(*p, ref, sha1))
 215                         had_error = 1;
 216         }
 217         return had_error;
 218 }
 219
 220 static int delete_tag(const char *name, const char *ref,
 221                                 const unsigned char *sha1)
 222 {
 223         if (delete_ref(ref, sha1, 0))
 224                 return 1;
 225         printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 226         return 0;
 227 }
 228
 229 static int verify_tag(const char *name, const char *ref,
 230                                 const unsigned char *sha1)
 231 {
 232         const char *argv_verify_tag[] = {"verify-tag",
 233                                         "-v", "SHA1_HEX", NULL};
 234         argv_verify_tag[2] = sha1_to_hex(sha1);
 235
 236         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 237                 return error(_("could not verify the tag '%s'"), name);
 238         return 0;
 239 }
 240
 241 static int do_sign(struct strbuf *buffer)
 242 {
 243         return sign_buffer(buffer, buffer, get_signing_key());
 244 }
 245
 246 static const char tag_template[] =
 247         N_("\n"
 248         "#\n"
 249         "# Write a tag message\n"
 250         "# Lines starting with '#' will be ignored.\n"
 251         "#\n");
 252
 253 static const char tag_template_nocleanup[] =
 254         N_("\n"
 255         "#\n"
 256         "# Write a tag message\n"
 257         "# Lines starting with '#' will be kept; you may remove them"
 258         " yourself if you want to.\n"
 259         "#\n");
 260
 261 static int git_tag_config(const char *var, const char *value, void *cb)
 262 {
 263         int status = git_gpg_config(var, value, cb);
 264         if (status)
 265                 return status;
 266         return git_default_config(var, value, cb);
 267 }
 268
 269 static void write_tag_body(int fd, const unsigned char *sha1)
 270 {
 271         unsigned long size;
 272         enum object_type type;
 273         char *buf, *sp;
 274
 275         buf = read_sha1_file(sha1, &type, &size);
 276         if (!buf)
 277                 return;
 278         /* skip header */
 279         sp = strstr(buf, "\n\n");
 280
 281         if (!sp || !size || type != OBJ_TAG) {
 282                 free(buf);
 283                 return;
 284         }
 285         sp += 2; /* skip the 2 LFs */
 286         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 287
 288         free(buf);
 289 }
 290
 291 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 292 {
 293         if (sign && do_sign(buf) < 0)
 294                 return error(_("unable to sign the tag"));
 295         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 296                 return error(_("unable to write tag file"));
 297         return 0;
 298 }
 299
 300 struct create_tag_options {
 301         unsigned int message_given:1;
 302         unsigned int sign;
 303         enum {
 304                 CLEANUP_NONE,
 305                 CLEANUP_SPACE,
 306                 CLEANUP_ALL
 307         } cleanup_mode;
 308 };
 309
 310 static void create_tag(const unsigned char *object, const char *tag,
 311                        struct strbuf *buf, struct create_tag_options *opt,
 312                        unsigned char *prev, unsigned char *result)
 313 {
 314         enum object_type type;
 315         char header_buf[1024];
 316         int header_len;
 317         char *path = NULL;
 318
 319         type = sha1_object_info(object, NULL);
 320         if (type <= OBJ_NONE)
 321             die(_("bad object type."));
 322
 323         header_len = snprintf(header_buf, sizeof(header_buf),
 324                           "object %s\n"
 325                           "type %s\n"
 326                           "tag %s\n"
 327                           "tagger %s\n\n",
 328                           sha1_to_hex(object),
 329                           typename(type),
 330                           tag,
 331                           git_committer_info(IDENT_ERROR_ON_NO_NAME));
 332
 333         if (header_len > sizeof(header_buf) - 1)
 334                 die(_("tag header too big."));
 335
 336         if (!opt->message_given) {
 337                 int fd;
 338
 339                 /* write the template message before editing: */
 340                 path = git_pathdup("TAG_EDITMSG");
 341                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 342                 if (fd < 0)
 343                         die_errno(_("could not create file '%s'"), path);
 344
 345                 if (!is_null_sha1(prev))
 346                         write_tag_body(fd, prev);
 347                 else if (opt->cleanup_mode == CLEANUP_ALL)
 348                         write_or_die(fd, _(tag_template),
 349                                         strlen(_(tag_template)));
 350                 else
 351                         write_or_die(fd, _(tag_template_nocleanup),
 352                                         strlen(_(tag_template_nocleanup)));
 353                 close(fd);
 354
 355                 if (launch_editor(path, buf, NULL)) {
 356                         fprintf(stderr,
 357                         _("Please supply the message using either -m or -F option.\n"));
 358                         exit(1);
 359                 }
 360         }
 361
 362         if (opt->cleanup_mode != CLEANUP_NONE)
 363                 stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 364
 365         if (!opt->message_given && !buf->len)
 366                 die(_("no tag message?"));
 367
 368         strbuf_insert(buf, 0, header_buf, header_len);
 369
 370         if (build_tag_object(buf, opt->sign, result) < 0) {
 371                 if (path)
 372                         fprintf(stderr, _("The tag message has been left in %s\n"),
 373                                 path);
 374                 exit(128);
 375         }
 376         if (path) {
 377                 unlink_or_warn(path);
 378                 free(path);
 379         }
 380 }
 381
 382 struct msg_arg {
 383         int given;
 384         struct strbuf buf;
 385 };
 386
 387 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 388 {
 389         struct msg_arg *msg = opt->value;
 390
 391         if (!arg)
 392                 return -1;
 393         if (msg->buf.len)
 394                 strbuf_addstr(&(msg->buf), "\n\n");
 395         strbuf_addstr(&(msg->buf), arg);
 396         msg->given = 1;
 397         return 0;
 398 }
 399
 400 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 401 {
 402         if (name[0] == '-')
 403                 return -1;
 404
 405         strbuf_reset(sb);
 406         strbuf_addf(sb, "refs/tags/%s", name);
 407
 408         return check_refname_format(sb->buf, 0);
 409 }
 410
 411 static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
 412                         const char *arg, int unset)
 413 {
 414         unsigned char sha1[20];
 415
 416         if (unset) {
 417                 sha1_array_clear(&points_at);
 418                 return 0;
 419         }
 420         if (!arg)
 421                 return error(_("switch 'points-at' requires an object"));
 422         if (get_sha1(arg, sha1))
 423                 return error(_("malformed object name '%s'"), arg);
 424         sha1_array_append(&points_at, sha1);
 425         return 0;
 426 }
 427
 428 int cmd_tag(int argc, const char **argv, const char *prefix)
 429 {
 430         struct strbuf buf = STRBUF_INIT;
 431         struct strbuf ref = STRBUF_INIT;
 432         unsigned char object[20], prev[20];
 433         const char *object_ref, *tag;
 434         struct ref_lock *lock;
 435         struct create_tag_options opt;
 436         char *cleanup_arg = NULL;
 437         int annotate = 0, force = 0, lines = -1, list = 0,
 438                 delete = 0, verify = 0;
 439         const char *msgfile = NULL, *keyid = NULL;
 440         struct msg_arg msg = { 0, STRBUF_INIT };
 441         struct commit_list *with_commit = NULL;
 442         struct option options[] = {
 443                 OPT_BOOLEAN('l', "list", &list, "list tag names"),
 444                 { OPTION_INTEGER, 'n', NULL, &lines, "n",
 445                                 "print <n> lines of each tag message",
 446                                 PARSE_OPT_OPTARG, NULL, 1 },
 447                 OPT_BOOLEAN('d', "delete", &delete, "delete tags"),
 448                 OPT_BOOLEAN('v', "verify", &verify, "verify tags"),
 449
 450                 OPT_GROUP("Tag creation options"),
 451                 OPT_BOOLEAN('a', "annotate", &annotate,
 452                                         "annotated tag, needs a message"),
 453                 OPT_CALLBACK('m', "message", &msg, "message",
 454                              "tag message", parse_msg_arg),
 455                 OPT_FILENAME('F', "file", &msgfile, "read message from file"),
 456                 OPT_BOOLEAN('s', "sign", &opt.sign, "annotated and GPG-signed tag"),
 457                 OPT_STRING(0, "cleanup", &cleanup_arg, "mode",
 458                         "how to strip spaces and #comments from message"),
 459                 OPT_STRING('u', "local-user", &keyid, "key-id",
 460                                         "use another key to sign the tag"),
 461                 OPT__FORCE(&force, "replace the tag if exists"),
 462
 463                 OPT_GROUP("Tag listing options"),
 464                 {
 465                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 466                         "print only tags that contain the commit",
 467                         PARSE_OPT_LASTARG_DEFAULT,
 468                         parse_opt_with_commit, (intptr_t)"HEAD",
 469                 },
 470                 {
 471                         OPTION_CALLBACK, 0, "points-at", NULL, "object",
 472                         "print only tags of the object", 0, parse_opt_points_at
 473                 },
 474                 OPT_END()
 475         };
 476
 477         git_config(git_tag_config, NULL);
 478
 479         memset(&opt, 0, sizeof(opt));
 480
 481         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 482
 483         if (keyid) {
 484                 opt.sign = 1;
 485                 set_signing_key(keyid);
 486         }
 487         if (opt.sign)
 488                 annotate = 1;
 489         if (argc == 0 && !(delete || verify))
 490                 list = 1;
 491
 492         if ((annotate || msg.given || msgfile || force) &&
 493             (list || delete || verify))
 494                 usage_with_options(git_tag_usage, options);
 495
 496         if (list + delete + verify > 1)
 497                 usage_with_options(git_tag_usage, options);
 498         if (list)
 499                 return list_tags(argv, lines == -1 ? 0 : lines,
 500                                  with_commit);
 501         if (lines != -1)
 502                 die(_("-n option is only allowed with -l."));
 503         if (with_commit)
 504                 die(_("--contains option is only allowed with -l."));
 505         if (points_at.nr)
 506                 die(_("--points-at option is only allowed with -l."));
 507         if (delete)
 508                 return for_each_tag_name(argv, delete_tag);
 509         if (verify)
 510                 return for_each_tag_name(argv, verify_tag);
 511
 512         if (msg.given || msgfile) {
 513                 if (msg.given && msgfile)
 514                         die(_("only one -F or -m option is allowed."));
 515                 annotate = 1;
 516                 if (msg.given)
 517                         strbuf_addbuf(&buf, &(msg.buf));
 518                 else {
 519                         if (!strcmp(msgfile, "-")) {
 520                                 if (strbuf_read(&buf, 0, 1024) < 0)
 521                                         die_errno(_("cannot read '%s'"), msgfile);
 522                         } else {
 523                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 524                                         die_errno(_("could not open or read '%s'"),
 525                                                 msgfile);
 526                         }
 527                 }
 528         }
 529
 530         tag = argv[0];
 531
 532         object_ref = argc == 2 ? argv[1] : "HEAD";
 533         if (argc > 2)
 534                 die(_("too many params"));
 535
 536         if (get_sha1(object_ref, object))
 537                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 538
 539         if (strbuf_check_tag_ref(&ref, tag))
 540                 die(_("'%s' is not a valid tag name."), tag);
 541
 542         if (read_ref(ref.buf, prev))
 543                 hashclr(prev);
 544         else if (!force)
 545                 die(_("tag '%s' already exists"), tag);
 546
 547         opt.message_given = msg.given || msgfile;
 548
 549         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 550                 opt.cleanup_mode = CLEANUP_ALL;
 551         else if (!strcmp(cleanup_arg, "verbatim"))
 552                 opt.cleanup_mode = CLEANUP_NONE;
 553         else if (!strcmp(cleanup_arg, "whitespace"))
 554                 opt.cleanup_mode = CLEANUP_SPACE;
 555         else
 556                 die(_("Invalid cleanup mode %s"), cleanup_arg);
 557
 558         if (annotate)
 559                 create_tag(object, tag, &buf, &opt, prev, object);
 560
 561         lock = lock_any_ref_for_update(ref.buf, prev, 0);
 562         if (!lock)
 563                 die(_("%s: cannot lock the ref"), ref.buf);
 564         if (write_ref_sha1(lock, object, NULL) < 0)
 565                 die(_("%s: cannot update the ref"), ref.buf);
 566         if (force && hashcmp(prev, object))
 567                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 568
 569         strbuf_release(&buf);
 570         strbuf_release(&ref);
 571         return 0;
 572 }