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
  18 static 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
  26 static char signingkey[1000];
  27
  28 struct tag_filter {
  29         const char **patterns;
  30         int lines;
  31         struct commit_list *with_commit;
  32 };
  33
  34 static 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
  45 static 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
  53 static 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
  82 static int contains(struct commit *candidate, const struct commit_list *want)
  83 {
  84         return contains_recurse(candidate, want);
  85 }
  86
  87 static 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
 146 static 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
 160 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 161                                 const unsigned char *sha1);
 162
 163 static 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
 188 static 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
 197 static 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
 209 static 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
 267 static const char tag_template[] =
 268         N_("\n"
 269         "#\n"
 270         "# Write a tag message\n"
 271         "#\n");
 272
 273 static 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
 279 static 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
 291 static 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
 313 static 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
 322 static 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
 389 struct msg_arg {
 390         int given;
 391         struct strbuf buf;
 392 };
 393
 394 static 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
 407 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 408 {
 409         if (name[0] == '-')
 410                 return -1;
 411
 412         strbuf_reset(sb);
 413         strbuf_addf(sb, "refs/tags/%s", name);
 414
 415         return check_refname_format(sb->buf, 0);
 416 }
 417
 418 int 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', "list", &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', "delete", &delete, "delete tags"),
 437                 OPT_BOOLEAN('v', "verify", &verify, "verify tags"),
 438
 439                 OPT_GROUP("Tag creation options"),
 440                 OPT_BOOLEAN('a', "annotate", &annotate,
 441                                         "annotated tag, needs a message"),
 442                 OPT_CALLBACK('m', "message", &msg, "message",
 443                              "tag message", parse_msg_arg),
 444                 OPT_FILENAME('F', "file", &msgfile, "read message from file"),
 445                 OPT_BOOLEAN('s', "sign", &sign, "annotated and GPG-signed tag"),
 446                 OPT_STRING('u', "local-user", &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 }