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 void show_tag_lines(const unsigned char *sha1, int lines)
  88 {
  89         int i;
  90         unsigned long size;
  91         enum object_type type;
  92         char *buf, *sp, *eol;
  93         size_t len;
  94
  95         buf = read_sha1_file(sha1, &type, &size);
  96         if (!buf || !size)
  97                 return;
  98
  99         /* skip header */
 100         sp = strstr(buf, "\n\n");
 101         if (!sp) {
 102                 free(buf);
 103                 return;
 104         }
 105         /* only take up to "lines" lines, and strip the signature */
 106         size = parse_signature(buf, size);
 107         for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
 108                 if (i)
 109                         printf("\n    ");
 110                 eol = memchr(sp, '\n', size - (sp - buf));
 111                 len = eol ? eol - sp : size - (sp - buf);
 112                 fwrite(sp, len, 1, stdout);
 113                 if (!eol)
 114                         break;
 115                 sp = eol + 1;
 116         }
 117         free(buf);
 118 }
 119
 120 static int show_reference(const char *refname, const unsigned char *sha1,
 121                           int flag, void *cb_data)
 122 {
 123         struct tag_filter *filter = cb_data;
 124
 125         if (match_pattern(filter->patterns, refname)) {
 126                 if (filter->with_commit) {
 127                         struct commit *commit;
 128
 129                         commit = lookup_commit_reference_gently(sha1, 1);
 130                         if (!commit)
 131                                 return 0;
 132                         if (!contains(commit, filter->with_commit))
 133                                 return 0;
 134                 }
 135
 136                 if (!filter->lines) {
 137                         printf("%s\n", refname);
 138                         return 0;
 139                 }
 140                 printf("%-15s ", refname);
 141                 show_tag_lines(sha1, filter->lines);
 142                 putchar('\n');
 143         }
 144
 145         return 0;
 146 }
 147
 148 static int list_tags(const char **patterns, int lines,
 149                         struct commit_list *with_commit)
 150 {
 151         struct tag_filter filter;
 152
 153         filter.patterns = patterns;
 154         filter.lines = lines;
 155         filter.with_commit = with_commit;
 156
 157         for_each_tag_ref(show_reference, (void *) &filter);
 158
 159         return 0;
 160 }
 161
 162 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 163                                 const unsigned char *sha1);
 164
 165 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 166 {
 167         const char **p;
 168         char ref[PATH_MAX];
 169         int had_error = 0;
 170         unsigned char sha1[20];
 171
 172         for (p = argv; *p; p++) {
 173                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 174                                         >= sizeof(ref)) {
 175                         error(_("tag name too long: %.*s..."), 50, *p);
 176                         had_error = 1;
 177                         continue;
 178                 }
 179                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 180                         error(_("tag '%s' not found."), *p);
 181                         had_error = 1;
 182                         continue;
 183                 }
 184                 if (fn(*p, ref, sha1))
 185                         had_error = 1;
 186         }
 187         return had_error;
 188 }
 189
 190 static int delete_tag(const char *name, const char *ref,
 191                                 const unsigned char *sha1)
 192 {
 193         if (delete_ref(ref, sha1, 0))
 194                 return 1;
 195         printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 196         return 0;
 197 }
 198
 199 static int verify_tag(const char *name, const char *ref,
 200                                 const unsigned char *sha1)
 201 {
 202         const char *argv_verify_tag[] = {"verify-tag",
 203                                         "-v", "SHA1_HEX", NULL};
 204         argv_verify_tag[2] = sha1_to_hex(sha1);
 205
 206         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 207                 return error(_("could not verify the tag '%s'"), name);
 208         return 0;
 209 }
 210
 211 static int do_sign(struct strbuf *buffer)
 212 {
 213         struct child_process gpg;
 214         const char *args[4];
 215         char *bracket;
 216         int len;
 217         int i, j;
 218
 219         if (!*signingkey) {
 220                 if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 221                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 222                         return error(_("committer info too long."));
 223                 bracket = strchr(signingkey, '>');
 224                 if (bracket)
 225                         bracket[1] = '\0';
 226         }
 227
 228         /* When the username signingkey is bad, program could be terminated
 229          * because gpg exits without reading and then write gets SIGPIPE. */
 230         signal(SIGPIPE, SIG_IGN);
 231
 232         memset(&gpg, 0, sizeof(gpg));
 233         gpg.argv = args;
 234         gpg.in = -1;
 235         gpg.out = -1;
 236         args[0] = "gpg";
 237         args[1] = "-bsau";
 238         args[2] = signingkey;
 239         args[3] = NULL;
 240
 241         if (start_command(&gpg))
 242                 return error(_("could not run gpg."));
 243
 244         if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 245                 close(gpg.in);
 246                 close(gpg.out);
 247                 finish_command(&gpg);
 248                 return error(_("gpg did not accept the tag data"));
 249         }
 250         close(gpg.in);
 251         len = strbuf_read(buffer, gpg.out, 1024);
 252         close(gpg.out);
 253
 254         if (finish_command(&gpg) || !len || len < 0)
 255                 return error(_("gpg failed to sign the tag"));
 256
 257         /* Strip CR from the line endings, in case we are on Windows. */
 258         for (i = j = 0; i < buffer->len; i++)
 259                 if (buffer->buf[i] != '\r') {
 260                         if (i != j)
 261                                 buffer->buf[j] = buffer->buf[i];
 262                         j++;
 263                 }
 264         strbuf_setlen(buffer, j);
 265
 266         return 0;
 267 }
 268
 269 static const char tag_template[] =
 270         N_("\n"
 271         "#\n"
 272         "# Write a tag message\n"
 273         "#\n");
 274
 275 static void set_signingkey(const char *value)
 276 {
 277         if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 278                 die(_("signing key value too long (%.10s...)"), value);
 279 }
 280
 281 static int git_tag_config(const char *var, const char *value, void *cb)
 282 {
 283         if (!strcmp(var, "user.signingkey")) {
 284                 if (!value)
 285                         return config_error_nonbool(var);
 286                 set_signingkey(value);
 287                 return 0;
 288         }
 289
 290         return git_default_config(var, value, cb);
 291 }
 292
 293 static void write_tag_body(int fd, const unsigned char *sha1)
 294 {
 295         unsigned long size;
 296         enum object_type type;
 297         char *buf, *sp;
 298
 299         buf = read_sha1_file(sha1, &type, &size);
 300         if (!buf)
 301                 return;
 302         /* skip header */
 303         sp = strstr(buf, "\n\n");
 304
 305         if (!sp || !size || type != OBJ_TAG) {
 306                 free(buf);
 307                 return;
 308         }
 309         sp += 2; /* skip the 2 LFs */
 310         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 311
 312         free(buf);
 313 }
 314
 315 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 316 {
 317         if (sign && do_sign(buf) < 0)
 318                 return error(_("unable to sign the tag"));
 319         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 320                 return error(_("unable to write tag file"));
 321         return 0;
 322 }
 323
 324 static void create_tag(const unsigned char *object, const char *tag,
 325                        struct strbuf *buf, int message, int sign,
 326                        unsigned char *prev, unsigned char *result)
 327 {
 328         enum object_type type;
 329         char header_buf[1024];
 330         int header_len;
 331         char *path = NULL;
 332
 333         type = sha1_object_info(object, NULL);
 334         if (type <= OBJ_NONE)
 335             die(_("bad object type."));
 336
 337         header_len = snprintf(header_buf, sizeof(header_buf),
 338                           "object %s\n"
 339                           "type %s\n"
 340                           "tag %s\n"
 341                           "tagger %s\n\n",
 342                           sha1_to_hex(object),
 343                           typename(type),
 344                           tag,
 345                           git_committer_info(IDENT_ERROR_ON_NO_NAME));
 346
 347         if (header_len > sizeof(header_buf) - 1)
 348                 die(_("tag header too big."));
 349
 350         if (!message) {
 351                 int fd;
 352
 353                 /* write the template message before editing: */
 354                 path = git_pathdup("TAG_EDITMSG");
 355                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 356                 if (fd < 0)
 357                         die_errno(_("could not create file '%s'"), path);
 358
 359                 if (!is_null_sha1(prev))
 360                         write_tag_body(fd, prev);
 361                 else
 362                         write_or_die(fd, _(tag_template), strlen(_(tag_template)));
 363                 close(fd);
 364
 365                 if (launch_editor(path, buf, NULL)) {
 366                         fprintf(stderr,
 367                         _("Please supply the message using either -m or -F option.\n"));
 368                         exit(1);
 369                 }
 370         }
 371
 372         stripspace(buf, 1);
 373
 374         if (!message && !buf->len)
 375                 die(_("no tag message?"));
 376
 377         strbuf_insert(buf, 0, header_buf, header_len);
 378
 379         if (build_tag_object(buf, sign, result) < 0) {
 380                 if (path)
 381                         fprintf(stderr, _("The tag message has been left in %s\n"),
 382                                 path);
 383                 exit(128);
 384         }
 385         if (path) {
 386                 unlink_or_warn(path);
 387                 free(path);
 388         }
 389 }
 390
 391 struct msg_arg {
 392         int given;
 393         struct strbuf buf;
 394 };
 395
 396 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 397 {
 398         struct msg_arg *msg = opt->value;
 399
 400         if (!arg)
 401                 return -1;
 402         if (msg->buf.len)
 403                 strbuf_addstr(&(msg->buf), "\n\n");
 404         strbuf_addstr(&(msg->buf), arg);
 405         msg->given = 1;
 406         return 0;
 407 }
 408
 409 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 410 {
 411         if (name[0] == '-')
 412                 return CHECK_REF_FORMAT_ERROR;
 413
 414         strbuf_reset(sb);
 415         strbuf_addf(sb, "refs/tags/%s", name);
 416
 417         return check_ref_format(sb->buf);
 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
 428         int annotate = 0, sign = 0, force = 0, lines = -1,
 429                 list = 0, delete = 0, verify = 0;
 430         const char *msgfile = NULL, *keyid = NULL;
 431         struct msg_arg msg = { 0, STRBUF_INIT };
 432         struct commit_list *with_commit = NULL;
 433         struct option options[] = {
 434                 OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 435                 { OPTION_INTEGER, 'n', NULL, &lines, "n",
 436                                 "print <n> lines of each tag message",
 437                                 PARSE_OPT_OPTARG, NULL, 1 },
 438                 OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 439                 OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 440
 441                 OPT_GROUP("Tag creation options"),
 442                 OPT_BOOLEAN('a', NULL, &annotate,
 443                                         "annotated tag, needs a message"),
 444                 OPT_CALLBACK('m', NULL, &msg, "message",
 445                              "tag message", parse_msg_arg),
 446                 OPT_FILENAME('F', NULL, &msgfile, "read message from file"),
 447                 OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 448                 OPT_STRING('u', NULL, &keyid, "key-id",
 449                                         "use another key to sign the tag"),
 450                 OPT__FORCE(&force, "replace the tag if exists"),
 451
 452                 OPT_GROUP("Tag listing options"),
 453                 {
 454                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 455                         "print only tags that contain the commit",
 456                         PARSE_OPT_LASTARG_DEFAULT,
 457                         parse_opt_with_commit, (intptr_t)"HEAD",
 458                 },
 459                 OPT_END()
 460         };
 461
 462         git_config(git_tag_config, NULL);
 463
 464         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 465
 466         if (keyid) {
 467                 sign = 1;
 468                 set_signingkey(keyid);
 469         }
 470         if (sign)
 471                 annotate = 1;
 472         if (argc == 0 && !(delete || verify))
 473                 list = 1;
 474
 475         if ((annotate || msg.given || msgfile || force) &&
 476             (list || delete || verify))
 477                 usage_with_options(git_tag_usage, options);
 478
 479         if (list + delete + verify > 1)
 480                 usage_with_options(git_tag_usage, options);
 481         if (list)
 482                 return list_tags(argv, lines == -1 ? 0 : lines,
 483                                  with_commit);
 484         if (lines != -1)
 485                 die(_("-n option is only allowed with -l."));
 486         if (with_commit)
 487                 die(_("--contains option is only allowed with -l."));
 488         if (delete)
 489                 return for_each_tag_name(argv, delete_tag);
 490         if (verify)
 491                 return for_each_tag_name(argv, verify_tag);
 492
 493         if (msg.given || msgfile) {
 494                 if (msg.given && msgfile)
 495                         die(_("only one -F or -m option is allowed."));
 496                 annotate = 1;
 497                 if (msg.given)
 498                         strbuf_addbuf(&buf, &(msg.buf));
 499                 else {
 500                         if (!strcmp(msgfile, "-")) {
 501                                 if (strbuf_read(&buf, 0, 1024) < 0)
 502                                         die_errno(_("cannot read '%s'"), msgfile);
 503                         } else {
 504                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 505                                         die_errno(_("could not open or read '%s'"),
 506                                                 msgfile);
 507                         }
 508                 }
 509         }
 510
 511         tag = argv[0];
 512
 513         object_ref = argc == 2 ? argv[1] : "HEAD";
 514         if (argc > 2)
 515                 die(_("too many params"));
 516
 517         if (get_sha1(object_ref, object))
 518                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 519
 520         if (strbuf_check_tag_ref(&ref, tag))
 521                 die(_("'%s' is not a valid tag name."), tag);
 522
 523         if (!resolve_ref(ref.buf, prev, 1, NULL))
 524                 hashclr(prev);
 525         else if (!force)
 526                 die(_("tag '%s' already exists"), tag);
 527
 528         if (annotate)
 529                 create_tag(object, tag, &buf, msg.given || msgfile,
 530                            sign, prev, object);
 531
 532         lock = lock_any_ref_for_update(ref.buf, prev, 0);
 533         if (!lock)
 534                 die(_("%s: cannot lock the ref"), ref.buf);
 535         if (write_ref_sha1(lock, object, NULL) < 0)
 536                 die(_("%s: cannot update the ref"), ref.buf);
 537         if (force && hashcmp(prev, object))
 538                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 539
 540         strbuf_release(&buf);
 541         strbuf_release(&ref);
 542         return 0;
 543 }