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 *pattern;
  28         int lines;
  29         struct commit_list *with_commit;
  30 };
  31
  32 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  33
  34 static int show_reference(const char *refname, const unsigned char *sha1,
  35                           int flag, void *cb_data)
  36 {
  37         struct tag_filter *filter = cb_data;
  38
  39         if (!fnmatch(filter->pattern, refname, 0)) {
  40                 int i;
  41                 unsigned long size;
  42                 enum object_type type;
  43                 char *buf, *sp, *eol;
  44                 size_t len;
  45
  46                 if (filter->with_commit) {
  47                         struct commit *commit;
  48
  49                         commit = lookup_commit_reference_gently(sha1, 1);
  50                         if (!commit)
  51                                 return 0;
  52                         if (!is_descendant_of(commit, filter->with_commit))
  53                                 return 0;
  54                 }
  55
  56                 if (!filter->lines) {
  57                         printf("%s\n", refname);
  58                         return 0;
  59                 }
  60                 printf("%-15s ", refname);
  61
  62                 buf = read_sha1_file(sha1, &type, &size);
  63                 if (!buf || !size)
  64                         return 0;
  65
  66                 /* skip header */
  67                 sp = strstr(buf, "\n\n");
  68                 if (!sp) {
  69                         free(buf);
  70                         return 0;
  71                 }
  72                 /* only take up to "lines" lines, and strip the signature */
  73                 for (i = 0, sp += 2;
  74                                 i < filter->lines && sp < buf + size &&
  75                                 prefixcmp(sp, PGP_SIGNATURE "\n");
  76                                 i++) {
  77                         if (i)
  78                                 printf("\n    ");
  79                         eol = memchr(sp, '\n', size - (sp - buf));
  80                         len = eol ? eol - sp : size - (sp - buf);
  81                         fwrite(sp, len, 1, stdout);
  82                         if (!eol)
  83                                 break;
  84                         sp = eol + 1;
  85                 }
  86                 putchar('\n');
  87                 free(buf);
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int list_tags(const char *pattern, int lines,
  94                         struct commit_list *with_commit)
  95 {
  96         struct tag_filter filter;
  97
  98         if (pattern == NULL)
  99                 pattern = "*";
 100
 101         filter.pattern = pattern;
 102         filter.lines = lines;
 103         filter.with_commit = with_commit;
 104
 105         for_each_tag_ref(show_reference, (void *) &filter);
 106
 107         return 0;
 108 }
 109
 110 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 111                                 const unsigned char *sha1);
 112
 113 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 114 {
 115         const char **p;
 116         char ref[PATH_MAX];
 117         int had_error = 0;
 118         unsigned char sha1[20];
 119
 120         for (p = argv; *p; p++) {
 121                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 122                                         >= sizeof(ref)) {
 123                         error("tag name too long: %.*s...", 50, *p);
 124                         had_error = 1;
 125                         continue;
 126                 }
 127                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 128                         error("tag '%s' not found.", *p);
 129                         had_error = 1;
 130                         continue;
 131                 }
 132                 if (fn(*p, ref, sha1))
 133                         had_error = 1;
 134         }
 135         return had_error;
 136 }
 137
 138 static int delete_tag(const char *name, const char *ref,
 139                                 const unsigned char *sha1)
 140 {
 141         if (delete_ref(ref, sha1, 0))
 142                 return 1;
 143         printf("Deleted tag '%s'\n", name);
 144         return 0;
 145 }
 146
 147 static int verify_tag(const char *name, const char *ref,
 148                                 const unsigned char *sha1)
 149 {
 150         const char *argv_verify_tag[] = {"git-verify-tag",
 151                                         "-v", "SHA1_HEX", NULL};
 152         argv_verify_tag[2] = sha1_to_hex(sha1);
 153
 154         if (run_command_v_opt(argv_verify_tag, 0))
 155                 return error("could not verify the tag '%s'", name);
 156         return 0;
 157 }
 158
 159 static int do_sign(struct strbuf *buffer)
 160 {
 161         struct child_process gpg;
 162         const char *args[4];
 163         char *bracket;
 164         int len;
 165         int i, j;
 166
 167         if (!*signingkey) {
 168                 if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 169                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 170                         return error("committer info too long.");
 171                 bracket = strchr(signingkey, '>');
 172                 if (bracket)
 173                         bracket[1] = '\0';
 174         }
 175
 176         /* When the username signingkey is bad, program could be terminated
 177          * because gpg exits without reading and then write gets SIGPIPE. */
 178         signal(SIGPIPE, SIG_IGN);
 179
 180         memset(&gpg, 0, sizeof(gpg));
 181         gpg.argv = args;
 182         gpg.in = -1;
 183         gpg.out = -1;
 184         args[0] = "gpg";
 185         args[1] = "-bsau";
 186         args[2] = signingkey;
 187         args[3] = NULL;
 188
 189         if (start_command(&gpg))
 190                 return error("could not run gpg.");
 191
 192         if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 193                 close(gpg.in);
 194                 close(gpg.out);
 195                 finish_command(&gpg);
 196                 return error("gpg did not accept the tag data");
 197         }
 198         close(gpg.in);
 199         len = strbuf_read(buffer, gpg.out, 1024);
 200         close(gpg.out);
 201
 202         if (finish_command(&gpg) || !len || len < 0)
 203                 return error("gpg failed to sign the tag");
 204
 205         /* Strip CR from the line endings, in case we are on Windows. */
 206         for (i = j = 0; i < buffer->len; i++)
 207                 if (buffer->buf[i] != '\r') {
 208                         if (i != j)
 209                                 buffer->buf[j] = buffer->buf[i];
 210                         j++;
 211                 }
 212         strbuf_setlen(buffer, j);
 213
 214         return 0;
 215 }
 216
 217 static const char tag_template[] =
 218         "\n"
 219         "#\n"
 220         "# Write a tag message\n"
 221         "#\n";
 222
 223 static void set_signingkey(const char *value)
 224 {
 225         if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 226                 die("signing key value too long (%.10s...)", value);
 227 }
 228
 229 static int git_tag_config(const char *var, const char *value, void *cb)
 230 {
 231         if (!strcmp(var, "user.signingkey")) {
 232                 if (!value)
 233                         return config_error_nonbool(var);
 234                 set_signingkey(value);
 235                 return 0;
 236         }
 237
 238         return git_default_config(var, value, cb);
 239 }
 240
 241 static void write_tag_body(int fd, const unsigned char *sha1)
 242 {
 243         unsigned long size;
 244         enum object_type type;
 245         char *buf, *sp, *eob;
 246         size_t len;
 247
 248         buf = read_sha1_file(sha1, &type, &size);
 249         if (!buf)
 250                 return;
 251         /* skip header */
 252         sp = strstr(buf, "\n\n");
 253
 254         if (!sp || !size || type != OBJ_TAG) {
 255                 free(buf);
 256                 return;
 257         }
 258         sp += 2; /* skip the 2 LFs */
 259         eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 260         if (eob)
 261                 len = eob - sp;
 262         else
 263                 len = buf + size - sp;
 264         write_or_die(fd, sp, len);
 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 int cmd_tag(int argc, const char **argv, const char *prefix)
 364 {
 365         struct strbuf buf = STRBUF_INIT;
 366         unsigned char object[20], prev[20];
 367         char ref[PATH_MAX];
 368         const char *object_ref, *tag;
 369         struct ref_lock *lock;
 370
 371         int annotate = 0, sign = 0, force = 0, lines = -1,
 372                 list = 0, delete = 0, verify = 0;
 373         const char *msgfile = NULL, *keyid = NULL;
 374         struct msg_arg msg = { 0, STRBUF_INIT };
 375         struct commit_list *with_commit = NULL;
 376         struct option options[] = {
 377                 OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 378                 { OPTION_INTEGER, 'n', NULL, &lines, "n",
 379                                 "print <n> lines of each tag message",
 380                                 PARSE_OPT_OPTARG, NULL, 1 },
 381                 OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 382                 OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 383
 384                 OPT_GROUP("Tag creation options"),
 385                 OPT_BOOLEAN('a', NULL, &annotate,
 386                                         "annotated tag, needs a message"),
 387                 OPT_CALLBACK('m', NULL, &msg, "msg",
 388                              "message for the tag", parse_msg_arg),
 389                 OPT_FILENAME('F', NULL, &msgfile, "message in a file"),
 390                 OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 391                 OPT_STRING('u', NULL, &keyid, "key-id",
 392                                         "use another key to sign the tag"),
 393                 OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
 394
 395                 OPT_GROUP("Tag listing options"),
 396                 {
 397                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 398                         "print only tags that contain the commit",
 399                         PARSE_OPT_LASTARG_DEFAULT,
 400                         parse_opt_with_commit, (intptr_t)"HEAD",
 401                 },
 402                 OPT_END()
 403         };
 404
 405         git_config(git_tag_config, NULL);
 406
 407         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 408
 409         if (keyid) {
 410                 sign = 1;
 411                 set_signingkey(keyid);
 412         }
 413         if (sign)
 414                 annotate = 1;
 415         if (argc == 0 && !(delete || verify))
 416                 list = 1;
 417
 418         if ((annotate || msg.given || msgfile || force) &&
 419             (list || delete || verify))
 420                 usage_with_options(git_tag_usage, options);
 421
 422         if (list + delete + verify > 1)
 423                 usage_with_options(git_tag_usage, options);
 424         if (list)
 425                 return list_tags(argv[0], lines == -1 ? 0 : lines,
 426                                  with_commit);
 427         if (lines != -1)
 428                 die("-n option is only allowed with -l.");
 429         if (with_commit)
 430                 die("--contains option is only allowed with -l.");
 431         if (delete)
 432                 return for_each_tag_name(argv, delete_tag);
 433         if (verify)
 434                 return for_each_tag_name(argv, verify_tag);
 435
 436         if (msg.given || msgfile) {
 437                 if (msg.given && msgfile)
 438                         die("only one -F or -m option is allowed.");
 439                 annotate = 1;
 440                 if (msg.given)
 441                         strbuf_addbuf(&buf, &(msg.buf));
 442                 else {
 443                         if (!strcmp(msgfile, "-")) {
 444                                 if (strbuf_read(&buf, 0, 1024) < 0)
 445                                         die_errno("cannot read '%s'", msgfile);
 446                         } else {
 447                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 448                                         die_errno("could not open or read '%s'",
 449                                                 msgfile);
 450                         }
 451                 }
 452         }
 453
 454         tag = argv[0];
 455
 456         object_ref = argc == 2 ? argv[1] : "HEAD";
 457         if (argc > 2)
 458                 die("too many params");
 459
 460         if (get_sha1(object_ref, object))
 461                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 462
 463         if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 464                 die("tag name too long: %.*s...", 50, tag);
 465         if (check_ref_format(ref))
 466                 die("'%s' is not a valid tag name.", tag);
 467
 468         if (!resolve_ref(ref, prev, 1, NULL))
 469                 hashclr(prev);
 470         else if (!force)
 471                 die("tag '%s' already exists", tag);
 472
 473         if (annotate)
 474                 create_tag(object, tag, &buf, msg.given || msgfile,
 475                            sign, prev, object);
 476
 477         lock = lock_any_ref_for_update(ref, prev, 0);
 478         if (!lock)
 479                 die("%s: cannot lock the ref", ref);
 480         if (write_ref_sha1(lock, object, NULL) < 0)
 481                 die("%s: cannot update the ref", ref);
 482
 483         strbuf_release(&buf);
 484         return 0;
 485 }