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