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                 close(gpg.out);
 234                 finish_command(&gpg);
 235                 return error("gpg did not accept the tag data");
 236         }
 237         close(gpg.in);
 238         len = strbuf_read(buffer, gpg.out, 1024);
 239         close(gpg.out);
 240
 241         if (finish_command(&gpg) || !len || len < 0)
 242                 return error("gpg failed to sign the tag");
 243
 244         return 0;
 245 }
 246
 247 static const char tag_template[] =
 248         "\n"
 249         "#\n"
 250         "# Write a tag message\n"
 251         "#\n";
 252
 253 static void set_signingkey(const char *value)
 254 {
 255         if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 256                 die("signing key value too long (%.10s...)", value);
 257 }
 258
 259 static int git_tag_config(const char *var, const char *value, void *cb)
 260 {
 261         if (!strcmp(var, "user.signingkey")) {
 262                 if (!value)
 263                         return config_error_nonbool(var);
 264                 set_signingkey(value);
 265                 return 0;
 266         }
 267
 268         return git_default_config(var, value, cb);
 269 }
 270
 271 static void write_tag_body(int fd, const unsigned char *sha1)
 272 {
 273         unsigned long size;
 274         enum object_type type;
 275         char *buf, *sp, *eob;
 276         size_t len;
 277
 278         buf = read_sha1_file(sha1, &type, &size);
 279         if (!buf)
 280                 return;
 281         /* skip header */
 282         sp = strstr(buf, "\n\n");
 283
 284         if (!sp || !size || type != OBJ_TAG) {
 285                 free(buf);
 286                 return;
 287         }
 288         sp += 2; /* skip the 2 LFs */
 289         eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 290         if (eob)
 291                 len = eob - sp;
 292         else
 293                 len = buf + size - sp;
 294         write_or_die(fd, sp, len);
 295
 296         free(buf);
 297 }
 298
 299 static void create_tag(const unsigned char *object, const char *tag,
 300                        struct strbuf *buf, int message, int sign,
 301                        unsigned char *prev, unsigned char *result)
 302 {
 303         enum object_type type;
 304         char header_buf[1024];
 305         int header_len;
 306
 307         type = sha1_object_info(object, NULL);
 308         if (type <= OBJ_NONE)
 309             die("bad object type.");
 310
 311         header_len = snprintf(header_buf, sizeof(header_buf),
 312                           "object %s\n"
 313                           "type %s\n"
 314                           "tag %s\n"
 315                           "tagger %s\n\n",
 316                           sha1_to_hex(object),
 317                           typename(type),
 318                           tag,
 319                           git_committer_info(IDENT_ERROR_ON_NO_NAME));
 320
 321         if (header_len > sizeof(header_buf) - 1)
 322                 die("tag header too big.");
 323
 324         if (!message) {
 325                 char *path;
 326                 int fd;
 327
 328                 /* write the template message before editing: */
 329                 path = xstrdup(git_path("TAG_EDITMSG"));
 330                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 331                 if (fd < 0)
 332                         die("could not create file '%s': %s",
 333                                                 path, strerror(errno));
 334
 335                 if (!is_null_sha1(prev))
 336                         write_tag_body(fd, prev);
 337                 else
 338                         write_or_die(fd, tag_template, strlen(tag_template));
 339                 close(fd);
 340
 341                 launch_editor(path, buf, NULL);
 342
 343                 unlink(path);
 344                 free(path);
 345         }
 346
 347         stripspace(buf, 1);
 348
 349         if (!message && !buf->len)
 350                 die("no tag message?");
 351
 352         strbuf_insert(buf, 0, header_buf, header_len);
 353
 354         if (sign && do_sign(buf) < 0)
 355                 die("unable to sign the tag");
 356         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 357                 die("unable to write tag file");
 358 }
 359
 360 struct msg_arg {
 361         int given;
 362         struct strbuf buf;
 363 };
 364
 365 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 366 {
 367         struct msg_arg *msg = opt->value;
 368
 369         if (!arg)
 370                 return -1;
 371         if (msg->buf.len)
 372                 strbuf_addstr(&(msg->buf), "\n\n");
 373         strbuf_addstr(&(msg->buf), arg);
 374         msg->given = 1;
 375         return 0;
 376 }
 377
 378 int cmd_tag(int argc, const char **argv, const char *prefix)
 379 {
 380         struct strbuf buf;
 381         unsigned char object[20], prev[20];
 382         char ref[PATH_MAX];
 383         const char *object_ref, *tag;
 384         struct ref_lock *lock;
 385
 386         int annotate = 0, sign = 0, force = 0, lines = 0,
 387                 list = 0, delete = 0, verify = 0;
 388         const char *msgfile = NULL, *keyid = NULL;
 389         struct msg_arg msg = { 0, STRBUF_INIT };
 390         struct option options[] = {
 391                 OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 392                 { OPTION_INTEGER, 'n', NULL, &lines, NULL,
 393                                 "print n lines of each tag message",
 394                                 PARSE_OPT_OPTARG, NULL, 1 },
 395                 OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 396                 OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 397
 398                 OPT_GROUP("Tag creation options"),
 399                 OPT_BOOLEAN('a', NULL, &annotate,
 400                                         "annotated tag, needs a message"),
 401                 OPT_CALLBACK('m', NULL, &msg, "msg",
 402                              "message for the tag", parse_msg_arg),
 403                 OPT_STRING('F', NULL, &msgfile, "file", "message in a file"),
 404                 OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 405                 OPT_STRING('u', NULL, &keyid, "key-id",
 406                                         "use another key to sign the tag"),
 407                 OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
 408                 OPT_END()
 409         };
 410
 411         git_config(git_tag_config, NULL);
 412
 413         argc = parse_options(argc, argv, options, git_tag_usage, 0);
 414         msgfile = parse_options_fix_filename(prefix, msgfile);
 415
 416         if (keyid) {
 417                 sign = 1;
 418                 set_signingkey(keyid);
 419         }
 420         if (sign)
 421                 annotate = 1;
 422
 423         if (list)
 424                 return list_tags(argv[0], lines);
 425         if (delete)
 426                 return for_each_tag_name(argv, delete_tag);
 427         if (verify)
 428                 return for_each_tag_name(argv, verify_tag);
 429
 430         strbuf_init(&buf, 0);
 431         if (msg.given || msgfile) {
 432                 if (msg.given && msgfile)
 433                         die("only one -F or -m option is allowed.");
 434                 annotate = 1;
 435                 if (msg.given)
 436                         strbuf_addbuf(&buf, &(msg.buf));
 437                 else {
 438                         if (!strcmp(msgfile, "-")) {
 439                                 if (strbuf_read(&buf, 0, 1024) < 0)
 440                                         die("cannot read %s", msgfile);
 441                         } else {
 442                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 443                                         die("could not open or read '%s': %s",
 444                                                 msgfile, strerror(errno));
 445                         }
 446                 }
 447         }
 448
 449         if (argc == 0) {
 450                 if (annotate)
 451                         usage_with_options(git_tag_usage, options);
 452                 return list_tags(NULL, lines);
 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 }