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