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 static int core_clock_skew = -1;
  29
  30 struct tag_filter {
  31         const char *pattern;
  32         int lines;
  33         struct commit_list *with_commit;
  34 };
  35
  36 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  37
  38 static int in_commit_list(const struct commit_list *want, struct commit *c)
  39 {
  40         for (; want; want = want->next)
  41                 if (!hashcmp(want->item->object.sha1, c->object.sha1))
  42                         return 1;
  43         return 0;
  44 }
  45
  46 static int contains_recurse(struct commit *candidate,
  47                             const struct commit_list *want,
  48                             unsigned long cutoff)
  49 {
  50         struct commit_list *p;
  51
  52         /* was it previously marked as containing a want commit? */
  53         if (candidate->object.flags & TMP_MARK)
  54                 return 1;
  55         /* or marked as not possibly containing a want commit? */
  56         if (candidate->object.flags & UNINTERESTING)
  57                 return 0;
  58         /* or are we it? */
  59         if (in_commit_list(want, candidate))
  60                 return 1;
  61
  62         if (parse_commit(candidate) < 0)
  63                 return 0;
  64
  65         /* stop searching if we go too far back in time */
  66         if (candidate->date < cutoff)
  67                 return 0;
  68
  69         /* Otherwise recurse and mark ourselves for future traversals. */
  70         for (p = candidate->parents; p; p = p->next) {
  71                 if (contains_recurse(p->item, want, cutoff)) {
  72                         candidate->object.flags |= TMP_MARK;
  73                         return 1;
  74                 }
  75         }
  76         candidate->object.flags |= UNINTERESTING;
  77         return 0;
  78 }
  79
  80 static int contains(struct commit *candidate, const struct commit_list *want)
  81 {
  82         unsigned long cutoff = 0;
  83
  84         if (core_clock_skew >= 0) {
  85                 const struct commit_list *c;
  86                 unsigned long min_date = ULONG_MAX;
  87                 for (c = want; c; c = c->next) {
  88                         if (parse_commit(c->item) < 0)
  89                                 continue;
  90                         if (c->item->date < min_date)
  91                                 min_date = c->item->date;
  92                 }
  93                 if (min_date > core_clock_skew)
  94                         cutoff = min_date - core_clock_skew;
  95         }
  96
  97         return contains_recurse(candidate, want, cutoff);
  98 }
  99
 100 static int show_reference(const char *refname, const unsigned char *sha1,
 101                           int flag, void *cb_data)
 102 {
 103         struct tag_filter *filter = cb_data;
 104
 105         if (!fnmatch(filter->pattern, refname, 0)) {
 106                 int i;
 107                 unsigned long size;
 108                 enum object_type type;
 109                 char *buf, *sp, *eol;
 110                 size_t len;
 111
 112                 if (filter->with_commit) {
 113                         struct commit *commit;
 114
 115                         commit = lookup_commit_reference_gently(sha1, 1);
 116                         if (!commit)
 117                                 return 0;
 118                         if (!contains(commit, filter->with_commit))
 119                                 return 0;
 120                 }
 121
 122                 if (!filter->lines) {
 123                         printf("%s\n", refname);
 124                         return 0;
 125                 }
 126                 printf("%-15s ", refname);
 127
 128                 buf = read_sha1_file(sha1, &type, &size);
 129                 if (!buf || !size)
 130                         return 0;
 131
 132                 /* skip header */
 133                 sp = strstr(buf, "\n\n");
 134                 if (!sp) {
 135                         free(buf);
 136                         return 0;
 137                 }
 138                 /* only take up to "lines" lines, and strip the signature */
 139                 for (i = 0, sp += 2;
 140                                 i < filter->lines && sp < buf + size &&
 141                                 prefixcmp(sp, PGP_SIGNATURE "\n");
 142                                 i++) {
 143                         if (i)
 144                                 printf("\n    ");
 145                         eol = memchr(sp, '\n', size - (sp - buf));
 146                         len = eol ? eol - sp : size - (sp - buf);
 147                         fwrite(sp, len, 1, stdout);
 148                         if (!eol)
 149                                 break;
 150                         sp = eol + 1;
 151                 }
 152                 putchar('\n');
 153                 free(buf);
 154         }
 155
 156         return 0;
 157 }
 158
 159 static int list_tags(const char *pattern, int lines,
 160                         struct commit_list *with_commit)
 161 {
 162         struct tag_filter filter;
 163
 164         if (pattern == NULL)
 165                 pattern = "*";
 166
 167         filter.pattern = pattern;
 168         filter.lines = lines;
 169         filter.with_commit = with_commit;
 170
 171         for_each_tag_ref(show_reference, (void *) &filter);
 172
 173         return 0;
 174 }
 175
 176 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 177                                 const unsigned char *sha1);
 178
 179 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 180 {
 181         const char **p;
 182         char ref[PATH_MAX];
 183         int had_error = 0;
 184         unsigned char sha1[20];
 185
 186         for (p = argv; *p; p++) {
 187                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 188                                         >= sizeof(ref)) {
 189                         error("tag name too long: %.*s...", 50, *p);
 190                         had_error = 1;
 191                         continue;
 192                 }
 193                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 194                         error("tag '%s' not found.", *p);
 195                         had_error = 1;
 196                         continue;
 197                 }
 198                 if (fn(*p, ref, sha1))
 199                         had_error = 1;
 200         }
 201         return had_error;
 202 }
 203
 204 static int delete_tag(const char *name, const char *ref,
 205                                 const unsigned char *sha1)
 206 {
 207         if (delete_ref(ref, sha1, 0))
 208                 return 1;
 209         printf("Deleted tag '%s' (was %s)\n", name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 210         return 0;
 211 }
 212
 213 static int verify_tag(const char *name, const char *ref,
 214                                 const unsigned char *sha1)
 215 {
 216         const char *argv_verify_tag[] = {"verify-tag",
 217                                         "-v", "SHA1_HEX", NULL};
 218         argv_verify_tag[2] = sha1_to_hex(sha1);
 219
 220         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 221                 return error("could not verify the tag '%s'", name);
 222         return 0;
 223 }
 224
 225 static int do_sign(struct strbuf *buffer)
 226 {
 227         struct child_process gpg;
 228         const char *args[4];
 229         char *bracket;
 230         int len;
 231         int i, j;
 232
 233         if (!*signingkey) {
 234                 if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 235                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 236                         return error("committer info too long.");
 237                 bracket = strchr(signingkey, '>');
 238                 if (bracket)
 239                         bracket[1] = '\0';
 240         }
 241
 242         /* When the username signingkey is bad, program could be terminated
 243          * because gpg exits without reading and then write gets SIGPIPE. */
 244         signal(SIGPIPE, SIG_IGN);
 245
 246         memset(&gpg, 0, sizeof(gpg));
 247         gpg.argv = args;
 248         gpg.in = -1;
 249         gpg.out = -1;
 250         args[0] = "gpg";
 251         args[1] = "-bsau";
 252         args[2] = signingkey;
 253         args[3] = NULL;
 254
 255         if (start_command(&gpg))
 256                 return error("could not run gpg.");
 257
 258         if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 259                 close(gpg.in);
 260                 close(gpg.out);
 261                 finish_command(&gpg);
 262                 return error("gpg did not accept the tag data");
 263         }
 264         close(gpg.in);
 265         len = strbuf_read(buffer, gpg.out, 1024);
 266         close(gpg.out);
 267
 268         if (finish_command(&gpg) || !len || len < 0)
 269                 return error("gpg failed to sign the tag");
 270
 271         /* Strip CR from the line endings, in case we are on Windows. */
 272         for (i = j = 0; i < buffer->len; i++)
 273                 if (buffer->buf[i] != '\r') {
 274                         if (i != j)
 275                                 buffer->buf[j] = buffer->buf[i];
 276                         j++;
 277                 }
 278         strbuf_setlen(buffer, j);
 279
 280         return 0;
 281 }
 282
 283 static const char tag_template[] =
 284         "\n"
 285         "#\n"
 286         "# Write a tag message\n"
 287         "#\n";
 288
 289 static void set_signingkey(const char *value)
 290 {
 291         if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 292                 die("signing key value too long (%.10s...)", value);
 293 }
 294
 295 static int git_tag_config(const char *var, const char *value, void *cb)
 296 {
 297         if (!strcmp(var, "user.signingkey")) {
 298                 if (!value)
 299                         return config_error_nonbool(var);
 300                 set_signingkey(value);
 301                 return 0;
 302         }
 303
 304         if (!strcmp(var, "core.clockskew")) {
 305                 if (!value || !strcmp(value, "none"))
 306                         core_clock_skew = -1;
 307                 else
 308                         core_clock_skew = git_config_int(var, value);
 309                 return 0;
 310         }
 311
 312         return git_default_config(var, value, cb);
 313 }
 314
 315 static void write_tag_body(int fd, const unsigned char *sha1)
 316 {
 317         unsigned long size;
 318         enum object_type type;
 319         char *buf, *sp, *eob;
 320         size_t len;
 321
 322         buf = read_sha1_file(sha1, &type, &size);
 323         if (!buf)
 324                 return;
 325         /* skip header */
 326         sp = strstr(buf, "\n\n");
 327
 328         if (!sp || !size || type != OBJ_TAG) {
 329                 free(buf);
 330                 return;
 331         }
 332         sp += 2; /* skip the 2 LFs */
 333         eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 334         if (eob)
 335                 len = eob - sp;
 336         else
 337                 len = buf + size - sp;
 338         write_or_die(fd, sp, len);
 339
 340         free(buf);
 341 }
 342
 343 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 344 {
 345         if (sign && do_sign(buf) < 0)
 346                 return error("unable to sign the tag");
 347         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 348                 return error("unable to write tag file");
 349         return 0;
 350 }
 351
 352 static void create_tag(const unsigned char *object, const char *tag,
 353                        struct strbuf *buf, int message, int sign,
 354                        unsigned char *prev, unsigned char *result)
 355 {
 356         enum object_type type;
 357         char header_buf[1024];
 358         int header_len;
 359         char *path = NULL;
 360
 361         type = sha1_object_info(object, NULL);
 362         if (type <= OBJ_NONE)
 363             die("bad object type.");
 364
 365         header_len = snprintf(header_buf, sizeof(header_buf),
 366                           "object %s\n"
 367                           "type %s\n"
 368                           "tag %s\n"
 369                           "tagger %s\n\n",
 370                           sha1_to_hex(object),
 371                           typename(type),
 372                           tag,
 373                           git_committer_info(IDENT_ERROR_ON_NO_NAME));
 374
 375         if (header_len > sizeof(header_buf) - 1)
 376                 die("tag header too big.");
 377
 378         if (!message) {
 379                 int fd;
 380
 381                 /* write the template message before editing: */
 382                 path = git_pathdup("TAG_EDITMSG");
 383                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 384                 if (fd < 0)
 385                         die_errno("could not create file '%s'", path);
 386
 387                 if (!is_null_sha1(prev))
 388                         write_tag_body(fd, prev);
 389                 else
 390                         write_or_die(fd, tag_template, strlen(tag_template));
 391                 close(fd);
 392
 393                 if (launch_editor(path, buf, NULL)) {
 394                         fprintf(stderr,
 395                         "Please supply the message using either -m or -F option.\n");
 396                         exit(1);
 397                 }
 398         }
 399
 400         stripspace(buf, 1);
 401
 402         if (!message && !buf->len)
 403                 die("no tag message?");
 404
 405         strbuf_insert(buf, 0, header_buf, header_len);
 406
 407         if (build_tag_object(buf, sign, result) < 0) {
 408                 if (path)
 409                         fprintf(stderr, "The tag message has been left in %s\n",
 410                                 path);
 411                 exit(128);
 412         }
 413         if (path) {
 414                 unlink_or_warn(path);
 415                 free(path);
 416         }
 417 }
 418
 419 struct msg_arg {
 420         int given;
 421         struct strbuf buf;
 422 };
 423
 424 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 425 {
 426         struct msg_arg *msg = opt->value;
 427
 428         if (!arg)
 429                 return -1;
 430         if (msg->buf.len)
 431                 strbuf_addstr(&(msg->buf), "\n\n");
 432         strbuf_addstr(&(msg->buf), arg);
 433         msg->given = 1;
 434         return 0;
 435 }
 436
 437 int cmd_tag(int argc, const char **argv, const char *prefix)
 438 {
 439         struct strbuf buf = STRBUF_INIT;
 440         unsigned char object[20], prev[20];
 441         char ref[PATH_MAX];
 442         const char *object_ref, *tag;
 443         struct ref_lock *lock;
 444
 445         int annotate = 0, sign = 0, force = 0, lines = -1,
 446                 list = 0, delete = 0, verify = 0;
 447         const char *msgfile = NULL, *keyid = NULL;
 448         struct msg_arg msg = { 0, STRBUF_INIT };
 449         struct commit_list *with_commit = NULL;
 450         struct option options[] = {
 451                 OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 452                 { OPTION_INTEGER, 'n', NULL, &lines, "n",
 453                                 "print <n> lines of each tag message",
 454                                 PARSE_OPT_OPTARG, NULL, 1 },
 455                 OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 456                 OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 457
 458                 OPT_GROUP("Tag creation options"),
 459                 OPT_BOOLEAN('a', NULL, &annotate,
 460                                         "annotated tag, needs a message"),
 461                 OPT_CALLBACK('m', NULL, &msg, "msg",
 462                              "message for the tag", parse_msg_arg),
 463                 OPT_FILENAME('F', NULL, &msgfile, "message in a file"),
 464                 OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 465                 OPT_STRING('u', NULL, &keyid, "key-id",
 466                                         "use another key to sign the tag"),
 467                 OPT_BOOLEAN('f', "force", &force, "replace the tag if exists"),
 468
 469                 OPT_GROUP("Tag listing options"),
 470                 {
 471                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 472                         "print only tags that contain the commit",
 473                         PARSE_OPT_LASTARG_DEFAULT,
 474                         parse_opt_with_commit, (intptr_t)"HEAD",
 475                 },
 476                 OPT_END()
 477         };
 478
 479         git_config(git_tag_config, NULL);
 480
 481         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 482
 483         if (keyid) {
 484                 sign = 1;
 485                 set_signingkey(keyid);
 486         }
 487         if (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[0], 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 (delete)
 506                 return for_each_tag_name(argv, delete_tag);
 507         if (verify)
 508                 return for_each_tag_name(argv, verify_tag);
 509
 510         if (msg.given || msgfile) {
 511                 if (msg.given && msgfile)
 512                         die("only one -F or -m option is allowed.");
 513                 annotate = 1;
 514                 if (msg.given)
 515                         strbuf_addbuf(&buf, &(msg.buf));
 516                 else {
 517                         if (!strcmp(msgfile, "-")) {
 518                                 if (strbuf_read(&buf, 0, 1024) < 0)
 519                                         die_errno("cannot read '%s'", msgfile);
 520                         } else {
 521                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 522                                         die_errno("could not open or read '%s'",
 523                                                 msgfile);
 524                         }
 525                 }
 526         }
 527
 528         tag = argv[0];
 529
 530         object_ref = argc == 2 ? argv[1] : "HEAD";
 531         if (argc > 2)
 532                 die("too many params");
 533
 534         if (get_sha1(object_ref, object))
 535                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 536
 537         if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 538                 die("tag name too long: %.*s...", 50, tag);
 539         if (check_ref_format(ref))
 540                 die("'%s' is not a valid tag name.", tag);
 541
 542         if (!resolve_ref(ref, prev, 1, NULL))
 543                 hashclr(prev);
 544         else if (!force)
 545                 die("tag '%s' already exists", tag);
 546
 547         if (annotate)
 548                 create_tag(object, tag, &buf, msg.given || msgfile,
 549                            sign, prev, object);
 550
 551         lock = lock_any_ref_for_update(ref, prev, 0);
 552         if (!lock)
 553                 die("%s: cannot lock the ref", ref);
 554         if (write_ref_sha1(lock, object, NULL) < 0)
 555                 die("%s: cannot update the ref", ref);
 556         if (force && hashcmp(prev, object))
 557                 printf("Updated tag '%s' (was %s)\n", tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 558
 559         strbuf_release(&buf);
 560         return 0;
 561 }