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