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 static void launch_editor(const char *path, struct strbuf *buffer)
  21 {
  22         const char *editor, *terminal;
  23         struct child_process child;
  24         const char *args[3];
  25
  26         editor = getenv("GIT_EDITOR");
  27         if (!editor && editor_program)
  28                 editor = editor_program;
  29         if (!editor)
  30                 editor = getenv("VISUAL");
  31         if (!editor)
  32                 editor = getenv("EDITOR");
  33
  34         terminal = getenv("TERM");
  35         if (!editor && (!terminal || !strcmp(terminal, "dumb"))) {
  36                 fprintf(stderr,
  37                 "Terminal is dumb but no VISUAL nor EDITOR defined.\n"
  38                 "Please supply the message using either -m or -F option.\n");
  39                 exit(1);
  40         }
  41
  42         if (!editor)
  43                 editor = "vi";
  44
  45         memset(&child, 0, sizeof(child));
  46         child.argv = args;
  47         args[0] = editor;
  48         args[1] = path;
  49         args[2] = NULL;
  50
  51         if (run_command(&child))
  52                 die("There was a problem with the editor %s.", editor);
  53
  54         if (strbuf_read_file(buffer, path, 0) < 0)
  55                 die("could not read message file '%s': %s",
  56                     path, strerror(errno));
  57 }
  58
  59 struct tag_filter {
  60         const char *pattern;
  61         int lines;
  62 };
  63
  64 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  65
  66 static int show_reference(const char *refname, const unsigned char *sha1,
  67                           int flag, void *cb_data)
  68 {
  69         struct tag_filter *filter = cb_data;
  70
  71         if (!fnmatch(filter->pattern, refname, 0)) {
  72                 int i;
  73                 unsigned long size;
  74                 enum object_type type;
  75                 char *buf, *sp, *eol;
  76                 size_t len;
  77
  78                 if (!filter->lines) {
  79                         printf("%s\n", refname);
  80                         return 0;
  81                 }
  82                 printf("%-15s ", refname);
  83
  84                 buf = read_sha1_file(sha1, &type, &size);
  85                 if (!buf || !size)
  86                         return 0;
  87
  88                 /* skip header */
  89                 sp = strstr(buf, "\n\n");
  90                 if (!sp) {
  91                         free(buf);
  92                         return 0;
  93                 }
  94                 /* only take up to "lines" lines, and strip the signature */
  95                 for (i = 0, sp += 2;
  96                                 i < filter->lines && sp < buf + size &&
  97                                 prefixcmp(sp, PGP_SIGNATURE "\n");
  98                                 i++) {
  99                         if (i)
 100                                 printf("\n    ");
 101                         eol = memchr(sp, '\n', size - (sp - buf));
 102                         len = eol ? eol - sp : size - (sp - buf);
 103                         fwrite(sp, len, 1, stdout);
 104                         if (!eol)
 105                                 break;
 106                         sp = eol + 1;
 107                 }
 108                 putchar('\n');
 109                 free(buf);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static int list_tags(const char *pattern, int lines)
 116 {
 117         struct tag_filter filter;
 118
 119         if (pattern == NULL)
 120                 pattern = "*";
 121
 122         filter.pattern = pattern;
 123         filter.lines = lines;
 124
 125         for_each_tag_ref(show_reference, (void *) &filter);
 126
 127         return 0;
 128 }
 129
 130 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 131                                 const unsigned char *sha1);
 132
 133 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 134 {
 135         const char **p;
 136         char ref[PATH_MAX];
 137         int had_error = 0;
 138         unsigned char sha1[20];
 139
 140         for (p = argv; *p; p++) {
 141                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 142                                         >= sizeof(ref)) {
 143                         error("tag name too long: %.*s...", 50, *p);
 144                         had_error = 1;
 145                         continue;
 146                 }
 147                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 148                         error("tag '%s' not found.", *p);
 149                         had_error = 1;
 150                         continue;
 151                 }
 152                 if (fn(*p, ref, sha1))
 153                         had_error = 1;
 154         }
 155         return had_error;
 156 }
 157
 158 static int delete_tag(const char *name, const char *ref,
 159                                 const unsigned char *sha1)
 160 {
 161         if (delete_ref(ref, sha1))
 162                 return 1;
 163         printf("Deleted tag '%s'\n", name);
 164         return 0;
 165 }
 166
 167 static int verify_tag(const char *name, const char *ref,
 168                                 const unsigned char *sha1)
 169 {
 170         const char *argv_verify_tag[] = {"git-verify-tag",
 171                                         "-v", "SHA1_HEX", NULL};
 172         argv_verify_tag[2] = sha1_to_hex(sha1);
 173
 174         if (run_command_v_opt(argv_verify_tag, 0))
 175                 return error("could not verify the tag '%s'", name);
 176         return 0;
 177 }
 178
 179 static int do_sign(struct strbuf *buffer)
 180 {
 181         struct child_process gpg;
 182         const char *args[4];
 183         char *bracket;
 184         int len;
 185
 186         if (!*signingkey) {
 187                 if (strlcpy(signingkey, git_committer_info(1),
 188                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 189                         return error("committer info too long.");
 190                 bracket = strchr(signingkey, '>');
 191                 if (bracket)
 192                         bracket[1] = '\0';
 193         }
 194
 195         /* When the username signingkey is bad, program could be terminated
 196          * because gpg exits without reading and then write gets SIGPIPE. */
 197         signal(SIGPIPE, SIG_IGN);
 198
 199         memset(&gpg, 0, sizeof(gpg));
 200         gpg.argv = args;
 201         gpg.in = -1;
 202         gpg.out = -1;
 203         args[0] = "gpg";
 204         args[1] = "-bsau";
 205         args[2] = signingkey;
 206         args[3] = NULL;
 207
 208         if (start_command(&gpg))
 209                 return error("could not run gpg.");
 210
 211         if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 212                 close(gpg.in);
 213                 finish_command(&gpg);
 214                 return error("gpg did not accept the tag data");
 215         }
 216         close(gpg.in);
 217         gpg.close_in = 0;
 218         len = strbuf_read(buffer, gpg.out, 1024);
 219
 220         if (finish_command(&gpg) || !len || len < 0)
 221                 return error("gpg failed to sign the tag");
 222
 223         if (len < 0)
 224                 return error("could not read the entire signature from gpg.");
 225
 226         return 0;
 227 }
 228
 229 static const char tag_template[] =
 230         "\n"
 231         "#\n"
 232         "# Write a tag message\n"
 233         "#\n";
 234
 235 static int git_tag_config(const char *var, const char *value)
 236 {
 237         if (!strcmp(var, "user.signingkey")) {
 238                 if (!value)
 239                         die("user.signingkey without value");
 240                 if (strlcpy(signingkey, value, sizeof(signingkey))
 241                                                 >= sizeof(signingkey))
 242                         die("user.signingkey value too long");
 243                 return 0;
 244         }
 245
 246         return git_default_config(var, value);
 247 }
 248
 249 static void write_tag_body(int fd, const unsigned char *sha1)
 250 {
 251         unsigned long size;
 252         enum object_type type;
 253         char *buf, *sp, *eob;
 254         size_t len;
 255
 256         buf = read_sha1_file(sha1, &type, &size);
 257         if (!buf)
 258                 return;
 259         /* skip header */
 260         sp = strstr(buf, "\n\n");
 261
 262         if (!sp || !size || type != OBJ_TAG) {
 263                 free(buf);
 264                 return;
 265         }
 266         sp += 2; /* skip the 2 LFs */
 267         eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 268         if (eob)
 269                 len = eob - sp;
 270         else
 271                 len = buf + size - sp;
 272         write_or_die(fd, sp, len);
 273
 274         free(buf);
 275 }
 276
 277 static void create_tag(const unsigned char *object, const char *tag,
 278                        struct strbuf *buf, int message, int sign,
 279                            unsigned char *prev, unsigned char *result)
 280 {
 281         enum object_type type;
 282         char header_buf[1024];
 283         int header_len;
 284
 285         type = sha1_object_info(object, NULL);
 286         if (type <= OBJ_NONE)
 287             die("bad object type.");
 288
 289         header_len = snprintf(header_buf, sizeof(header_buf),
 290                           "object %s\n"
 291                           "type %s\n"
 292                           "tag %s\n"
 293                           "tagger %s\n\n",
 294                           sha1_to_hex(object),
 295                           typename(type),
 296                           tag,
 297                           git_committer_info(1));
 298
 299         if (header_len > sizeof(header_buf) - 1)
 300                 die("tag header too big.");
 301
 302         if (!message) {
 303                 char *path;
 304                 int fd;
 305
 306                 /* write the template message before editing: */
 307                 path = xstrdup(git_path("TAG_EDITMSG"));
 308                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 309                 if (fd < 0)
 310                         die("could not create file '%s': %s",
 311                                                 path, strerror(errno));
 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                 launch_editor(path, buf);
 320
 321                 unlink(path);
 322                 free(path);
 323         }
 324
 325         stripspace(buf, 1);
 326
 327         if (!message && !buf->len)
 328                 die("no tag message?");
 329
 330         strbuf_insert(buf, 0, header_buf, header_len);
 331
 332         if (sign && do_sign(buf) < 0)
 333                 die("unable to sign the tag");
 334         if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 335                 die("unable to write tag file");
 336 }
 337
 338 int cmd_tag(int argc, const char **argv, const char *prefix)
 339 {
 340         struct strbuf buf;
 341         unsigned char object[20], prev[20];
 342         int annotate = 0, sign = 0, force = 0, lines = 0, message = 0;
 343         char ref[PATH_MAX];
 344         const char *object_ref, *tag;
 345         int i;
 346         struct ref_lock *lock;
 347
 348         git_config(git_tag_config);
 349         strbuf_init(&buf, 0);
 350
 351         for (i = 1; i < argc; i++) {
 352                 const char *arg = argv[i];
 353
 354                 if (arg[0] != '-')
 355                         break;
 356                 if (!strcmp(arg, "-a")) {
 357                         annotate = 1;
 358                         continue;
 359                 }
 360                 if (!strcmp(arg, "-s")) {
 361                         annotate = 1;
 362                         sign = 1;
 363                         continue;
 364                 }
 365                 if (!strcmp(arg, "-f")) {
 366                         force = 1;
 367                         continue;
 368                 }
 369                 if (!strcmp(arg, "-n")) {
 370                         if (i + 1 == argc || *argv[i + 1] == '-')
 371                                 /* no argument */
 372                                 lines = 1;
 373                         else
 374                                 lines = isdigit(*argv[++i]) ?
 375                                         atoi(argv[i]) : 1;
 376                         continue;
 377                 }
 378                 if (!strcmp(arg, "-m")) {
 379                         annotate = 1;
 380                         i++;
 381                         if (i == argc)
 382                                 die("option -m needs an argument.");
 383                         if (message)
 384                                 die("only one -F or -m option is allowed.");
 385                         strbuf_addstr(&buf, argv[i]);
 386                         message = 1;
 387                         continue;
 388                 }
 389                 if (!strcmp(arg, "-F")) {
 390                         annotate = 1;
 391                         i++;
 392                         if (i == argc)
 393                                 die("option -F needs an argument.");
 394                         if (message)
 395                                 die("only one -F or -m option is allowed.");
 396
 397                         if (!strcmp(argv[i], "-")) {
 398                                 if (strbuf_read(&buf, 0, 1024) < 0)
 399                                         die("cannot read %s", argv[i]);
 400                         } else {
 401                                 if (strbuf_read_file(&buf, argv[i], 1024) < 0)
 402                                         die("could not open or read '%s': %s",
 403                                                 argv[i], strerror(errno));
 404                         }
 405                         message = 1;
 406                         continue;
 407                 }
 408                 if (!strcmp(arg, "-u")) {
 409                         annotate = 1;
 410                         sign = 1;
 411                         i++;
 412                         if (i == argc)
 413                                 die("option -u needs an argument.");
 414                         if (strlcpy(signingkey, argv[i], sizeof(signingkey))
 415                                                         >= sizeof(signingkey))
 416                                 die("argument to option -u too long");
 417                         continue;
 418                 }
 419                 if (!strcmp(arg, "-l"))
 420                         return list_tags(argv[i + 1], lines);
 421                 if (!strcmp(arg, "-d"))
 422                         return for_each_tag_name(argv + i + 1, delete_tag);
 423                 if (!strcmp(arg, "-v"))
 424                         return for_each_tag_name(argv + i + 1, verify_tag);
 425                 usage(builtin_tag_usage);
 426         }
 427
 428         if (i == argc) {
 429                 if (annotate)
 430                         usage(builtin_tag_usage);
 431                 return list_tags(NULL, lines);
 432         }
 433         tag = argv[i++];
 434
 435         object_ref = i < argc ? argv[i] : "HEAD";
 436         if (i + 1 < argc)
 437                 die("too many params");
 438
 439         if (get_sha1(object_ref, object))
 440                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 441
 442         if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 443                 die("tag name too long: %.*s...", 50, tag);
 444         if (check_ref_format(ref))
 445                 die("'%s' is not a valid tag name.", tag);
 446
 447         if (!resolve_ref(ref, prev, 1, NULL))
 448                 hashclr(prev);
 449         else if (!force)
 450                 die("tag '%s' already exists", tag);
 451
 452         if (annotate)
 453                 create_tag(object, tag, &buf, message, sign, prev, object);
 454
 455         lock = lock_any_ref_for_update(ref, prev, 0);
 456         if (!lock)
 457                 die("%s: cannot lock the ref", ref);
 458         if (write_ref_sha1(lock, object, NULL) < 0)
 459                 die("%s: cannot update the ref", ref);
 460
 461         strbuf_release(&buf);
 462         return 0;
 463 }