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