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 void launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
  27 {
  28         const char *editor, *terminal;
  29
  30         editor = getenv("GIT_EDITOR");
  31         if (!editor && editor_program)
  32                 editor = editor_program;
  33         if (!editor)
  34                 editor = getenv("VISUAL");
  35         if (!editor)
  36                 editor = getenv("EDITOR");
  37
  38         terminal = getenv("TERM");
  39         if (!editor && (!terminal || !strcmp(terminal, "dumb"))) {
  40                 fprintf(stderr,
  41                 "Terminal is dumb but no VISUAL nor EDITOR defined.\n"
  42                 "Please supply the message using either -m or -F option.\n");
  43                 exit(1);
  44         }
  45
  46         if (!editor)
  47                 editor = "vi";
  48
  49         if (strcmp(editor, ":")) {
  50                 size_t len = strlen(editor);
  51                 int i = 0;
  52                 const char *args[6];
  53                 struct strbuf arg0;
  54
  55                 strbuf_init(&arg0, 0);
  56                 if (strcspn(editor, "$ \t'") != len) {
  57                         /* there are specials */
  58                         strbuf_addf(&arg0, "%s \"$@\"", editor);
  59                         args[i++] = "sh";
  60                         args[i++] = "-c";
  61                         args[i++] = arg0.buf;
  62                 }
  63                 args[i++] = editor;
  64                 args[i++] = path;
  65                 args[i] = NULL;
  66
  67                 if (run_command_v_opt_cd_env(args, 0, NULL, env))
  68                         die("There was a problem with the editor %s.", editor);
  69                 strbuf_release(&arg0);
  70         }
  71
  72         if (!buffer)
  73                 return;
  74         if (strbuf_read_file(buffer, path, 0) < 0)
  75                 die("could not read message file '%s': %s",
  76                     path, strerror(errno));
  77 }
  78
  79 struct tag_filter {
  80         const char *pattern;
  81         int lines;
  82 };
  83
  84 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  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 (!fnmatch(filter->pattern, refname, 0)) {
  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->lines) {
  99                         printf("%s\n", refname);
 100                         return 0;
 101                 }
 102                 printf("%-15s ", refname);
 103
 104                 buf = read_sha1_file(sha1, &type, &size);
 105                 if (!buf || !size)
 106                         return 0;
 107
 108                 /* skip header */
 109                 sp = strstr(buf, "\n\n");
 110                 if (!sp) {
 111                         free(buf);
 112                         return 0;
 113                 }
 114                 /* only take up to "lines" lines, and strip the signature */
 115                 for (i = 0, sp += 2;
 116                                 i < filter->lines && sp < buf + size &&
 117                                 prefixcmp(sp, PGP_SIGNATURE "\n");
 118                                 i++) {
 119                         if (i)
 120                                 printf("\n    ");
 121                         eol = memchr(sp, '\n', size - (sp - buf));
 122                         len = eol ? eol - sp : size - (sp - buf);
 123                         fwrite(sp, len, 1, stdout);
 124                         if (!eol)
 125                                 break;
 126                         sp = eol + 1;
 127                 }
 128                 putchar('\n');
 129                 free(buf);
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int list_tags(const char *pattern, int lines)
 136 {
 137         struct tag_filter filter;
 138
 139         if (pattern == NULL)
 140                 pattern = "*";
 141
 142         filter.pattern = pattern;
 143         filter.lines = lines;
 144
 145         for_each_tag_ref(show_reference, (void *) &filter);
 146
 147         return 0;
 148 }
 149
 150 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 151                                 const unsigned char *sha1);
 152
 153 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 154 {
 155         const char **p;
 156         char ref[PATH_MAX];
 157         int had_error = 0;
 158         unsigned char sha1[20];
 159
 160         for (p = argv; *p; p++) {
 161                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 162                                         >= sizeof(ref)) {
 163                         error("tag name too long: %.*s...", 50, *p);
 164                         had_error = 1;
 165                         continue;
 166                 }
 167                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 168                         error("tag '%s' not found.", *p);
 169                         had_error = 1;
 170                         continue;
 171                 }
 172                 if (fn(*p, ref, sha1))
 173                         had_error = 1;
 174         }
 175         return had_error;
 176 }
 177
 178 static int delete_tag(const char *name, const char *ref,
 179                                 const unsigned char *sha1)
 180 {
 181         if (delete_ref(ref, sha1))
 182                 return 1;
 183         printf("Deleted tag '%s'\n", name);
 184         return 0;
 185 }
 186
 187 static int verify_tag(const char *name, const char *ref,
 188                                 const unsigned char *sha1)
 189 {
 190         const char *argv_verify_tag[] = {"git-verify-tag",
 191                                         "-v", "SHA1_HEX", NULL};
 192         argv_verify_tag[2] = sha1_to_hex(sha1);
 193
 194         if (run_command_v_opt(argv_verify_tag, 0))
 195                 return error("could not verify the tag '%s'", name);
 196         return 0;
 197 }
 198
 199 static int do_sign(struct strbuf *buffer)
 200 {
 201         struct child_process gpg;
 202         const char *args[4];
 203         char *bracket;
 204         int len;
 205
 206         if (!*signingkey) {
 207                 if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 208                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 209                         return error("committer info too long.");
 210                 bracket = strchr(signingkey, '>');
 211                 if (bracket)
 212                         bracket[1] = '\0';
 213         }
 214
 215         /* When the username signingkey is bad, program could be terminated
 216          * because gpg exits without reading and then write gets SIGPIPE. */
 217         signal(SIGPIPE, SIG_IGN);
 218
 219         memset(&gpg, 0, sizeof(gpg));
 220         gpg.argv = args;
 221         gpg.in = -1;
 222         gpg.out = -1;
 223         args[0] = "gpg";
 224         args[1] = "-bsau";
 225         args[2] = signingkey;
 226         args[3] = NULL;
 227
 228         if (start_command(&gpg))
 229                 return error("could not run gpg.");
 230
 231         if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 232                 close(gpg.in);
 233                 finish_command(&gpg);
 234                 return error("gpg did not accept the tag data");
 235         }
 236         close(gpg.in);
 237         gpg.close_in = 0;
 238         len = strbuf_read(buffer, gpg.out, 1024);
 239
 240         if (finish_command(&gpg) || !len || len < 0)
 241                 return error("gpg failed to sign the tag");
 242
 243         if (len < 0)
 244                 return error("could not read the entire signature from gpg.");
 245
 246         return 0;
 247 }
 248
 249 static const char tag_template[] =
 250         "\n"
 251         "#\n"
 252         "# Write a tag message\n"
 253         "#\n";
 254
 255 static void set_signingkey(const char *value)
 256 {
 257         if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 258                 die("signing key value too long (%.10s...)", value);
 259 }
 260
 261 static int git_tag_config(const char *var, const char *value)
 262 {
 263         if (!strcmp(var, "user.signingkey")) {
 264                 if (!value)
 265                         return config_error_nonbool(value);
 266                 set_signingkey(value);
 267                 return 0;
 268         }
 269
 270         return git_default_config(var, value);
 271 }
 272
 273 static void write_tag_body(int fd, const unsigned char *sha1)
 274 {
 275         unsigned long size;
 276         enum object_type type;
 277         char *buf, *sp, *eob;
 278         size_t len;
 279
 280         buf = read_sha1_file(sha1, &type, &size);
 281         if (!buf)
 282                 return;
 283         /* skip header */
 284         sp = strstr(buf, "\n\n");
 285
 286         if (!sp || !size || type != OBJ_TAG) {
 287                 free(buf);
 288                 return;
 289         }
 290         sp += 2; /* skip the 2 LFs */
 291         eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 292         if (eob)
 293                 len = eob - sp;
 294         else
 295                 len = buf + size - sp;
 296         write_or_die(fd, sp, len);
 297
 298         free(buf);
 299 }
 300
 301 static void create_tag(const unsigned char *object, const char *tag,
 302                        struct strbuf *buf, int message, int sign,
 303                        unsigned char *prev, unsigned char *result)
 304 {
 305         enum object_type type;
 306         char header_buf[1024];
 307         int header_len;
 308
 309         type = sha1_object_info(object, NULL);
 310         if (type <= OBJ_NONE)
 311             die("bad object type.");
 312
 313         header_len = snprintf(header_buf, sizeof(header_buf),
 314                           "object %s\n"
 315                           "type %s\n"
 316                           "tag %s\n"
 317                           "tagger %s\n\n",
 318                           sha1_to_hex(object),
 319                           typename(type),
 320                           tag,
 321                           git_committer_info(IDENT_ERROR_ON_NO_NAME));
 322
 323         if (header_len > sizeof(header_buf) - 1)
 324                 die("tag header too big.");
 325
 326         if (!message) {
 327                 char *path;
 328                 int fd;
 329
 330                 /* write the template message before editing: */
 331                 path = xstrdup(git_path("TAG_EDITMSG"));
 332                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 333                 if (fd < 0)
 334                         die("could not create file '%s': %s",
 335                                                 path, strerror(errno));
 336
 337                 if (!is_null_sha1(prev))
 338                         write_tag_body(fd, prev);
 339                 else
 340                         write_or_die(fd, tag_template, strlen(tag_template));
 341                 close(fd);
 342
 343                 launch_editor(path, buf, NULL);
 344
 345                 unlink(path);
 346                 free(path);
 347         }
 348
 349         stripspace(buf, 1);
 350
 351         if (!message && !buf->len)
 352                 die("no tag message?");
 353
 354         strbuf_insert(buf, 0, header_buf, header_len);
 355
 356         if (sign && do_sign(buf) < 0)
 357                 die("unable to sign the tag");
 358         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 359                 die("unable to write tag file");
 360 }
 361
 362 struct msg_arg {
 363         int given;
 364         struct strbuf buf;
 365 };
 366
 367 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 368 {
 369         struct msg_arg *msg = opt->value;
 370
 371         if (!arg)
 372                 return -1;
 373         if (msg->buf.len)
 374                 strbuf_addstr(&(msg->buf), "\n\n");
 375         strbuf_addstr(&(msg->buf), arg);
 376         msg->given = 1;
 377         return 0;
 378 }
 379
 380 int cmd_tag(int argc, const char **argv, const char *prefix)
 381 {
 382         struct strbuf buf;
 383         unsigned char object[20], prev[20];
 384         char ref[PATH_MAX];
 385         const char *object_ref, *tag;
 386         struct ref_lock *lock;
 387
 388         int annotate = 0, sign = 0, force = 0, lines = 0,
 389                 list = 0, delete = 0, verify = 0;
 390         char *msgfile = NULL, *keyid = NULL;
 391         struct msg_arg msg = { 0, STRBUF_INIT };
 392         struct option options[] = {
 393                 OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 394                 { OPTION_INTEGER, 'n', NULL, &lines, NULL,
 395                                 "print n lines of each tag message",
 396                                 PARSE_OPT_OPTARG, NULL, 1 },
 397                 OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 398                 OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 399
 400                 OPT_GROUP("Tag creation options"),
 401                 OPT_BOOLEAN('a', NULL, &annotate,
 402                                         "annotated tag, needs a message"),
 403                 OPT_CALLBACK('m', NULL, &msg, "msg",
 404                              "message for the tag", parse_msg_arg),
 405                 OPT_STRING('F', NULL, &msgfile, "file", "message in a file"),
 406                 OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 407                 OPT_STRING('u', NULL, &keyid, "key-id",
 408                                         "use another key to sign the tag"),
 409                 OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
 410                 OPT_END()
 411         };
 412
 413         git_config(git_tag_config);
 414
 415         argc = parse_options(argc, argv, options, git_tag_usage, 0);
 416
 417         if (keyid) {
 418                 sign = 1;
 419                 set_signingkey(keyid);
 420         }
 421         if (sign)
 422                 annotate = 1;
 423
 424         if (list)
 425                 return list_tags(argv[0], lines);
 426         if (delete)
 427                 return for_each_tag_name(argv, delete_tag);
 428         if (verify)
 429                 return for_each_tag_name(argv, verify_tag);
 430
 431         strbuf_init(&buf, 0);
 432         if (msg.given || msgfile) {
 433                 if (msg.given && msgfile)
 434                         die("only one -F or -m option is allowed.");
 435                 annotate = 1;
 436                 if (msg.given)
 437                         strbuf_addbuf(&buf, &(msg.buf));
 438                 else {
 439                         if (!strcmp(msgfile, "-")) {
 440                                 if (strbuf_read(&buf, 0, 1024) < 0)
 441                                         die("cannot read %s", msgfile);
 442                         } else {
 443                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 444                                         die("could not open or read '%s': %s",
 445                                                 msgfile, strerror(errno));
 446                         }
 447                 }
 448         }
 449
 450         if (argc == 0) {
 451                 if (annotate)
 452                         usage_with_options(git_tag_usage, options);
 453                 return list_tags(NULL, lines);
 454         }
 455         tag = argv[0];
 456
 457         object_ref = argc == 2 ? argv[1] : "HEAD";
 458         if (argc > 2)
 459                 die("too many params");
 460
 461         if (get_sha1(object_ref, object))
 462                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 463
 464         if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 465                 die("tag name too long: %.*s...", 50, tag);
 466         if (check_ref_format(ref))
 467                 die("'%s' is not a valid tag name.", tag);
 468
 469         if (!resolve_ref(ref, prev, 1, NULL))
 470                 hashclr(prev);
 471         else if (!force)
 472                 die("tag '%s' already exists", tag);
 473
 474         if (annotate)
 475                 create_tag(object, tag, &buf, msg.given || msgfile,
 476                            sign, prev, object);
 477
 478         lock = lock_any_ref_for_update(ref, prev, 0);
 479         if (!lock)
 480                 die("%s: cannot lock the ref", ref);
 481         if (write_ref_sha1(lock, object, NULL) < 0)
 482                 die("%s: cannot update the ref", ref);
 483
 484         strbuf_release(&buf);
 485         return 0;
 486 }