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
  16 static const char * const git_tag_usage[] = {
  17         "git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
  18         "git tag -d <tagname>...",
  19         "git tag -l [-n[<num>]] [<pattern>...]",
  20         "git tag -v <tagname>...",
  21         NULL
  22 };
  23
  24 static char signingkey[1000];
  25
  26 struct tag_filter {
  27         const char **patterns;
  28         int lines;
  29         struct commit_list *with_commit;
  30 };
  31
  32 static int match_pattern(const char **patterns, const char *ref)
  33 {
  34         /* no pattern means match everything */
  35         if (!*patterns)
  36                 return 1;
  37         for (; *patterns; patterns++)
  38                 if (!fnmatch(*patterns, ref, 0))
  39                         return 1;
  40         return 0;
  41 }
  42
  43 static int show_reference(const char *refname, const unsigned char *sha1,
  44                           int flag, void *cb_data)
  45 {
  46         struct tag_filter *filter = cb_data;
  47
  48         if (match_pattern(filter->patterns, refname)) {
  49                 int i;
  50                 unsigned long size;
  51                 enum object_type type;
  52                 char *buf, *sp, *eol;
  53                 size_t len;
  54
  55                 if (filter->with_commit) {
  56                         struct commit *commit;
  57
  58                         commit = lookup_commit_reference_gently(sha1, 1);
  59                         if (!commit)
  60                                 return 0;
  61                         if (!is_descendant_of(commit, filter->with_commit))
  62                                 return 0;
  63                 }
  64
  65                 if (!filter->lines) {
  66                         printf("%s\n", refname);
  67                         return 0;
  68                 }
  69                 printf("%-15s ", refname);
  70
  71                 buf = read_sha1_file(sha1, &type, &size);
  72                 if (!buf || !size)
  73                         return 0;
  74
  75                 /* skip header */
  76                 sp = strstr(buf, "\n\n");
  77                 if (!sp) {
  78                         free(buf);
  79                         return 0;
  80                 }
  81                 /* only take up to "lines" lines, and strip the signature */
  82                 size = parse_signature(buf, size);
  83                 for (i = 0, sp += 2;
  84                                 i < filter->lines && sp < buf + size;
  85                                 i++) {
  86                         if (i)
  87                                 printf("\n    ");
  88                         eol = memchr(sp, '\n', size - (sp - buf));
  89                         len = eol ? eol - sp : size - (sp - buf);
  90                         fwrite(sp, len, 1, stdout);
  91                         if (!eol)
  92                                 break;
  93                         sp = eol + 1;
  94                 }
  95                 putchar('\n');
  96                 free(buf);
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int list_tags(const char **patterns, int lines,
 103                         struct commit_list *with_commit)
 104 {
 105         struct tag_filter filter;
 106
 107         filter.patterns = patterns;
 108         filter.lines = lines;
 109         filter.with_commit = with_commit;
 110
 111         for_each_tag_ref(show_reference, (void *) &filter);
 112
 113         return 0;
 114 }
 115
 116 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 117                                 const unsigned char *sha1);
 118
 119 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 120 {
 121         const char **p;
 122         char ref[PATH_MAX];
 123         int had_error = 0;
 124         unsigned char sha1[20];
 125
 126         for (p = argv; *p; p++) {
 127                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 128                                         >= sizeof(ref)) {
 129                         error(_("tag name too long: %.*s..."), 50, *p);
 130                         had_error = 1;
 131                         continue;
 132                 }
 133                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 134                         error(_("tag '%s' not found."), *p);
 135                         had_error = 1;
 136                         continue;
 137                 }
 138                 if (fn(*p, ref, sha1))
 139                         had_error = 1;
 140         }
 141         return had_error;
 142 }
 143
 144 static int delete_tag(const char *name, const char *ref,
 145                                 const unsigned char *sha1)
 146 {
 147         if (delete_ref(ref, sha1, 0))
 148                 return 1;
 149         printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
 150         return 0;
 151 }
 152
 153 static int verify_tag(const char *name, const char *ref,
 154                                 const unsigned char *sha1)
 155 {
 156         const char *argv_verify_tag[] = {"verify-tag",
 157                                         "-v", "SHA1_HEX", NULL};
 158         argv_verify_tag[2] = sha1_to_hex(sha1);
 159
 160         if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
 161                 return error(_("could not verify the tag '%s'"), name);
 162         return 0;
 163 }
 164
 165 static int do_sign(struct strbuf *buffer)
 166 {
 167         struct child_process gpg;
 168         const char *args[4];
 169         char *bracket;
 170         int len;
 171         int i, j;
 172
 173         if (!*signingkey) {
 174                 if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 175                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 176                         return error(_("committer info too long."));
 177                 bracket = strchr(signingkey, '>');
 178                 if (bracket)
 179                         bracket[1] = '\0';
 180         }
 181
 182         /* When the username signingkey is bad, program could be terminated
 183          * because gpg exits without reading and then write gets SIGPIPE. */
 184         signal(SIGPIPE, SIG_IGN);
 185
 186         memset(&gpg, 0, sizeof(gpg));
 187         gpg.argv = args;
 188         gpg.in = -1;
 189         gpg.out = -1;
 190         args[0] = "gpg";
 191         args[1] = "-bsau";
 192         args[2] = signingkey;
 193         args[3] = NULL;
 194
 195         if (start_command(&gpg))
 196                 return error(_("could not run gpg."));
 197
 198         if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 199                 close(gpg.in);
 200                 close(gpg.out);
 201                 finish_command(&gpg);
 202                 return error(_("gpg did not accept the tag data"));
 203         }
 204         close(gpg.in);
 205         len = strbuf_read(buffer, gpg.out, 1024);
 206         close(gpg.out);
 207
 208         if (finish_command(&gpg) || !len || len < 0)
 209                 return error(_("gpg failed to sign the tag"));
 210
 211         /* Strip CR from the line endings, in case we are on Windows. */
 212         for (i = j = 0; i < buffer->len; i++)
 213                 if (buffer->buf[i] != '\r') {
 214                         if (i != j)
 215                                 buffer->buf[j] = buffer->buf[i];
 216                         j++;
 217                 }
 218         strbuf_setlen(buffer, j);
 219
 220         return 0;
 221 }
 222
 223 static const char tag_template[] =
 224         N_("\n"
 225         "#\n"
 226         "# Write a tag message\n"
 227         "#\n");
 228
 229 static void set_signingkey(const char *value)
 230 {
 231         if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 232                 die(_("signing key value too long (%.10s...)"), value);
 233 }
 234
 235 static int git_tag_config(const char *var, const char *value, void *cb)
 236 {
 237         if (!strcmp(var, "user.signingkey")) {
 238                 if (!value)
 239                         return config_error_nonbool(var);
 240                 set_signingkey(value);
 241                 return 0;
 242         }
 243
 244         return git_default_config(var, value, cb);
 245 }
 246
 247 static void write_tag_body(int fd, const unsigned char *sha1)
 248 {
 249         unsigned long size;
 250         enum object_type type;
 251         char *buf, *sp;
 252
 253         buf = read_sha1_file(sha1, &type, &size);
 254         if (!buf)
 255                 return;
 256         /* skip header */
 257         sp = strstr(buf, "\n\n");
 258
 259         if (!sp || !size || type != OBJ_TAG) {
 260                 free(buf);
 261                 return;
 262         }
 263         sp += 2; /* skip the 2 LFs */
 264         write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 265
 266         free(buf);
 267 }
 268
 269 static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 270 {
 271         if (sign && do_sign(buf) < 0)
 272                 return error(_("unable to sign the tag"));
 273         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 274                 return error(_("unable to write tag file"));
 275         return 0;
 276 }
 277
 278 static void create_tag(const unsigned char *object, const char *tag,
 279                        struct strbuf *buf, int message, int sign,
 280                        unsigned char *prev, unsigned char *result)
 281 {
 282         enum object_type type;
 283         char header_buf[1024];
 284         int header_len;
 285         char *path = NULL;
 286
 287         type = sha1_object_info(object, NULL);
 288         if (type <= OBJ_NONE)
 289             die(_("bad object type."));
 290
 291         header_len = snprintf(header_buf, sizeof(header_buf),
 292                           "object %s\n"
 293                           "type %s\n"
 294                           "tag %s\n"
 295                           "tagger %s\n\n",
 296                           sha1_to_hex(object),
 297                           typename(type),
 298                           tag,
 299                           git_committer_info(IDENT_ERROR_ON_NO_NAME));
 300
 301         if (header_len > sizeof(header_buf) - 1)
 302                 die(_("tag header too big."));
 303
 304         if (!message) {
 305                 int fd;
 306
 307                 /* write the template message before editing: */
 308                 path = git_pathdup("TAG_EDITMSG");
 309                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 310                 if (fd < 0)
 311                         die_errno(_("could not create file '%s'"), path);
 312
 313                 if (!is_null_sha1(prev))
 314                         write_tag_body(fd, prev);
 315                 else
 316                         write_or_die(fd, _(tag_template), strlen(_(tag_template)));
 317                 close(fd);
 318
 319                 if (launch_editor(path, buf, NULL)) {
 320                         fprintf(stderr,
 321                         _("Please supply the message using either -m or -F option.\n"));
 322                         exit(1);
 323                 }
 324         }
 325
 326         stripspace(buf, 1);
 327
 328         if (!message && !buf->len)
 329                 die(_("no tag message?"));
 330
 331         strbuf_insert(buf, 0, header_buf, header_len);
 332
 333         if (build_tag_object(buf, sign, result) < 0) {
 334                 if (path)
 335                         fprintf(stderr, _("The tag message has been left in %s\n"),
 336                                 path);
 337                 exit(128);
 338         }
 339         if (path) {
 340                 unlink_or_warn(path);
 341                 free(path);
 342         }
 343 }
 344
 345 struct msg_arg {
 346         int given;
 347         struct strbuf buf;
 348 };
 349
 350 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 351 {
 352         struct msg_arg *msg = opt->value;
 353
 354         if (!arg)
 355                 return -1;
 356         if (msg->buf.len)
 357                 strbuf_addstr(&(msg->buf), "\n\n");
 358         strbuf_addstr(&(msg->buf), arg);
 359         msg->given = 1;
 360         return 0;
 361 }
 362
 363 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 364 {
 365         if (name[0] == '-')
 366                 return CHECK_REF_FORMAT_ERROR;
 367
 368         strbuf_reset(sb);
 369         strbuf_addf(sb, "refs/tags/%s", name);
 370
 371         return check_ref_format(sb->buf);
 372 }
 373
 374 int cmd_tag(int argc, const char **argv, const char *prefix)
 375 {
 376         struct strbuf buf = STRBUF_INIT;
 377         struct strbuf ref = STRBUF_INIT;
 378         unsigned char object[20], prev[20];
 379         const char *object_ref, *tag;
 380         struct ref_lock *lock;
 381
 382         int annotate = 0, sign = 0, force = 0, lines = -1,
 383                 list = 0, delete = 0, verify = 0;
 384         const char *msgfile = NULL, *keyid = NULL;
 385         struct msg_arg msg = { 0, STRBUF_INIT };
 386         struct commit_list *with_commit = NULL;
 387         struct option options[] = {
 388                 OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 389                 { OPTION_INTEGER, 'n', NULL, &lines, "n",
 390                                 "print <n> lines of each tag message",
 391                                 PARSE_OPT_OPTARG, NULL, 1 },
 392                 OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 393                 OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 394
 395                 OPT_GROUP("Tag creation options"),
 396                 OPT_BOOLEAN('a', NULL, &annotate,
 397                                         "annotated tag, needs a message"),
 398                 OPT_CALLBACK('m', NULL, &msg, "message",
 399                              "tag message", parse_msg_arg),
 400                 OPT_FILENAME('F', NULL, &msgfile, "read message from file"),
 401                 OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 402                 OPT_STRING('u', NULL, &keyid, "key-id",
 403                                         "use another key to sign the tag"),
 404                 OPT__FORCE(&force, "replace the tag if exists"),
 405
 406                 OPT_GROUP("Tag listing options"),
 407                 {
 408                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 409                         "print only tags that contain the commit",
 410                         PARSE_OPT_LASTARG_DEFAULT,
 411                         parse_opt_with_commit, (intptr_t)"HEAD",
 412                 },
 413                 OPT_END()
 414         };
 415
 416         git_config(git_tag_config, NULL);
 417
 418         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 419
 420         if (keyid) {
 421                 sign = 1;
 422                 set_signingkey(keyid);
 423         }
 424         if (sign)
 425                 annotate = 1;
 426         if (argc == 0 && !(delete || verify))
 427                 list = 1;
 428
 429         if ((annotate || msg.given || msgfile || force) &&
 430             (list || delete || verify))
 431                 usage_with_options(git_tag_usage, options);
 432
 433         if (list + delete + verify > 1)
 434                 usage_with_options(git_tag_usage, options);
 435         if (list)
 436                 return list_tags(argv, lines == -1 ? 0 : lines,
 437                                  with_commit);
 438         if (lines != -1)
 439                 die(_("-n option is only allowed with -l."));
 440         if (with_commit)
 441                 die(_("--contains option is only allowed with -l."));
 442         if (delete)
 443                 return for_each_tag_name(argv, delete_tag);
 444         if (verify)
 445                 return for_each_tag_name(argv, verify_tag);
 446
 447         if (msg.given || msgfile) {
 448                 if (msg.given && msgfile)
 449                         die(_("only one -F or -m option is allowed."));
 450                 annotate = 1;
 451                 if (msg.given)
 452                         strbuf_addbuf(&buf, &(msg.buf));
 453                 else {
 454                         if (!strcmp(msgfile, "-")) {
 455                                 if (strbuf_read(&buf, 0, 1024) < 0)
 456                                         die_errno(_("cannot read '%s'"), msgfile);
 457                         } else {
 458                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 459                                         die_errno(_("could not open or read '%s'"),
 460                                                 msgfile);
 461                         }
 462                 }
 463         }
 464
 465         tag = argv[0];
 466
 467         object_ref = argc == 2 ? argv[1] : "HEAD";
 468         if (argc > 2)
 469                 die(_("too many params"));
 470
 471         if (get_sha1(object_ref, object))
 472                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 473
 474         if (strbuf_check_tag_ref(&ref, tag))
 475                 die(_("'%s' is not a valid tag name."), tag);
 476
 477         if (!resolve_ref(ref.buf, prev, 1, NULL))
 478                 hashclr(prev);
 479         else if (!force)
 480                 die(_("tag '%s' already exists"), tag);
 481
 482         if (annotate)
 483                 create_tag(object, tag, &buf, msg.given || msgfile,
 484                            sign, prev, object);
 485
 486         lock = lock_any_ref_for_update(ref.buf, prev, 0);
 487         if (!lock)
 488                 die(_("%s: cannot lock the ref"), ref.buf);
 489         if (write_ref_sha1(lock, object, NULL) < 0)
 490                 die(_("%s: cannot update the ref"), ref.buf);
 491         if (force && hashcmp(prev, object))
 492                 printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 493
 494         strbuf_release(&buf);
 495         strbuf_release(&ref);
 496         return 0;
 497 }