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