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         char *newpattern;
 127
 128         if (pattern == NULL)
 129                 pattern = "";
 130
 131         /* prepend/append * to the shell pattern: */
 132         newpattern = xmalloc(strlen(pattern) + 3);
 133         sprintf(newpattern, "*%s*", pattern);
 134
 135         filter.pattern = newpattern;
 136         filter.lines = lines;
 137
 138         for_each_tag_ref(show_reference, (void *) &filter);
 139
 140         free(newpattern);
 141
 142         return 0;
 143 }
 144
 145 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 146                                 const unsigned char *sha1);
 147
 148 static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 149 {
 150         const char **p;
 151         char ref[PATH_MAX];
 152         int had_error = 0;
 153         unsigned char sha1[20];
 154
 155         for (p = argv; *p; p++) {
 156                 if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 157                                         >= sizeof(ref)) {
 158                         error("tag name too long: %.*s...", 50, *p);
 159                         had_error = 1;
 160                         continue;
 161                 }
 162                 if (!resolve_ref(ref, sha1, 1, NULL)) {
 163                         error("tag '%s' not found.", *p);
 164                         had_error = 1;
 165                         continue;
 166                 }
 167                 if (fn(*p, ref, sha1))
 168                         had_error = 1;
 169         }
 170         return had_error;
 171 }
 172
 173 static int delete_tag(const char *name, const char *ref,
 174                                 const unsigned char *sha1)
 175 {
 176         if (delete_ref(ref, sha1))
 177                 return 1;
 178         printf("Deleted tag '%s'\n", name);
 179         return 0;
 180 }
 181
 182 static int verify_tag(const char *name, const char *ref,
 183                                 const unsigned char *sha1)
 184 {
 185         const char *argv_verify_tag[] = {"git-verify-tag",
 186                                         "-v", "SHA1_HEX", NULL};
 187         argv_verify_tag[2] = sha1_to_hex(sha1);
 188
 189         if (run_command_v_opt(argv_verify_tag, 0))
 190                 return error("could not verify the tag '%s'", name);
 191         return 0;
 192 }
 193
 194 static ssize_t do_sign(char *buffer, size_t size, size_t max)
 195 {
 196         struct child_process gpg;
 197         const char *args[4];
 198         char *bracket;
 199         int len;
 200
 201         if (!*signingkey) {
 202                 if (strlcpy(signingkey, git_committer_info(1),
 203                                 sizeof(signingkey)) > sizeof(signingkey) - 1)
 204                         return error("committer info too long.");
 205                 bracket = strchr(signingkey, '>');
 206                 if (bracket)
 207                         bracket[1] = '\0';
 208         }
 209
 210         memset(&gpg, 0, sizeof(gpg));
 211         gpg.argv = args;
 212         gpg.in = -1;
 213         gpg.out = -1;
 214         args[0] = "gpg";
 215         args[1] = "-bsau";
 216         args[2] = signingkey;
 217         args[3] = NULL;
 218
 219         if (start_command(&gpg))
 220                 return error("could not run gpg.");
 221
 222         write_or_die(gpg.in, buffer, size);
 223         close(gpg.in);
 224         gpg.close_in = 0;
 225         len = read_in_full(gpg.out, buffer + size, max - size);
 226
 227         finish_command(&gpg);
 228
 229         if (len == max - size)
 230                 return error("could not read the entire signature from gpg.");
 231
 232         return size + len;
 233 }
 234
 235 static const char tag_template[] =
 236         "\n"
 237         "#\n"
 238         "# Write a tag message\n"
 239         "#\n";
 240
 241 static int git_tag_config(const char *var, const char *value)
 242 {
 243         if (!strcmp(var, "user.signingkey")) {
 244                 if (!value)
 245                         die("user.signingkey without value");
 246                 if (strlcpy(signingkey, value, sizeof(signingkey))
 247                                                 >= sizeof(signingkey))
 248                         die("user.signingkey value too long");
 249                 return 0;
 250         }
 251
 252         return git_default_config(var, value);
 253 }
 254
 255 #define MAX_SIGNATURE_LENGTH 1024
 256 /* message must be NULL or allocated, it will be reallocated and freed */
 257 static void create_tag(const unsigned char *object, const char *tag,
 258                        char *message, int sign, unsigned char *result)
 259 {
 260         enum object_type type;
 261         char header_buf[1024], *buffer = NULL;
 262         int header_len, max_size;
 263         unsigned long size = 0;
 264
 265         type = sha1_object_info(object, NULL);
 266         if (type <= OBJ_NONE)
 267             die("bad object type.");
 268
 269         header_len = snprintf(header_buf, sizeof(header_buf),
 270                           "object %s\n"
 271                           "type %s\n"
 272                           "tag %s\n"
 273                           "tagger %s\n\n",
 274                           sha1_to_hex(object),
 275                           typename(type),
 276                           tag,
 277                           git_committer_info(1));
 278
 279         if (header_len > sizeof(header_buf) - 1)
 280                 die("tag header too big.");
 281
 282         if (!message) {
 283                 char *path;
 284                 int fd;
 285
 286                 /* write the template message before editing: */
 287                 path = xstrdup(git_path("TAG_EDITMSG"));
 288                 fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 289                 if (fd < 0)
 290                         die("could not create file '%s': %s",
 291                                                 path, strerror(errno));
 292                 write_or_die(fd, tag_template, strlen(tag_template));
 293                 close(fd);
 294
 295                 launch_editor(path, &buffer, &size);
 296
 297                 unlink(path);
 298                 free(path);
 299         }
 300         else {
 301                 buffer = message;
 302                 size = strlen(message);
 303         }
 304
 305         size = stripspace(buffer, size, 1);
 306
 307         if (!message && !size)
 308                 die("no tag message?");
 309
 310         /* insert the header and add the '\n' if needed: */
 311         max_size = header_len + size + (sign ? MAX_SIGNATURE_LENGTH : 0) + 1;
 312         buffer = xrealloc(buffer, max_size);
 313         if (size)
 314                 buffer[size++] = '\n';
 315         memmove(buffer + header_len, buffer, size);
 316         memcpy(buffer, header_buf, header_len);
 317         size += header_len;
 318
 319         if (sign) {
 320                 size = do_sign(buffer, size, max_size);
 321                 if (size < 0)
 322                         die("unable to sign the tag");
 323         }
 324
 325         if (write_sha1_file(buffer, size, tag_type, result) < 0)
 326                 die("unable to write tag file");
 327         free(buffer);
 328 }
 329
 330 int cmd_tag(int argc, const char **argv, const char *prefix)
 331 {
 332         unsigned char object[20], prev[20];
 333         int annotate = 0, sign = 0, force = 0, lines = 0;
 334         char *message = NULL;
 335         char ref[PATH_MAX];
 336         const char *object_ref, *tag;
 337         int i;
 338         struct ref_lock *lock;
 339
 340         git_config(git_tag_config);
 341
 342         for (i = 1; i < argc; i++) {
 343                 const char *arg = argv[i];
 344
 345                 if (arg[0] != '-')
 346                         break;
 347                 if (!strcmp(arg, "-a")) {
 348                         annotate = 1;
 349                         continue;
 350                 }
 351                 if (!strcmp(arg, "-s")) {
 352                         annotate = 1;
 353                         sign = 1;
 354                         continue;
 355                 }
 356                 if (!strcmp(arg, "-f")) {
 357                         force = 1;
 358                         continue;
 359                 }
 360                 if (!strcmp(arg, "-n")) {
 361                         if (i + 1 == argc || *argv[i + 1] == '-')
 362                                 /* no argument */
 363                                 lines = 1;
 364                         else
 365                                 lines = isdigit(*argv[++i]) ?
 366                                         atoi(argv[i]) : 1;
 367                         continue;
 368                 }
 369                 if (!strcmp(arg, "-m")) {
 370                         annotate = 1;
 371                         i++;
 372                         if (i == argc)
 373                                 die("option -m needs an argument.");
 374                         if (message)
 375                                 die("only one -F or -m option is allowed.");
 376                         message = xstrdup(argv[i]);
 377                         continue;
 378                 }
 379                 if (!strcmp(arg, "-F")) {
 380                         unsigned long len;
 381                         int fd;
 382
 383                         annotate = 1;
 384                         i++;
 385                         if (i == argc)
 386                                 die("option -F needs an argument.");
 387                         if (message)
 388                                 die("only one -F or -m option is allowed.");
 389
 390                         if (!strcmp(argv[i], "-"))
 391                                 fd = 0;
 392                         else {
 393                                 fd = open(argv[i], O_RDONLY);
 394                                 if (fd < 0)
 395                                         die("could not open '%s': %s",
 396                                                 argv[i], strerror(errno));
 397                         }
 398                         len = 1024;
 399                         message = xmalloc(len);
 400                         if (read_fd(fd, &message, &len)) {
 401                                 free(message);
 402                                 die("cannot read %s", argv[i]);
 403                         }
 404                         continue;
 405                 }
 406                 if (!strcmp(arg, "-u")) {
 407                         annotate = 1;
 408                         sign = 1;
 409                         i++;
 410                         if (i == argc)
 411                                 die("option -u needs an argument.");
 412                         if (strlcpy(signingkey, argv[i], sizeof(signingkey))
 413                                                         >= sizeof(signingkey))
 414                                 die("argument to option -u too long");
 415                         continue;
 416                 }
 417                 if (!strcmp(arg, "-l"))
 418                         return list_tags(argv[i + 1], lines);
 419                 if (!strcmp(arg, "-d"))
 420                         return for_each_tag_name(argv + i + 1, delete_tag);
 421                 if (!strcmp(arg, "-v"))
 422                         return for_each_tag_name(argv + i + 1, verify_tag);
 423                 usage(builtin_tag_usage);
 424         }
 425
 426         if (i == argc) {
 427                 if (annotate)
 428                         usage(builtin_tag_usage);
 429                 return list_tags(NULL, lines);
 430         }
 431         tag = argv[i++];
 432
 433         object_ref = i < argc ? argv[i] : "HEAD";
 434         if (i + 1 < argc)
 435                 die("too many params");
 436
 437         if (get_sha1(object_ref, object))
 438                 die("Failed to resolve '%s' as a valid ref.", object_ref);
 439
 440         if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 441                 die("tag name too long: %.*s...", 50, tag);
 442         if (check_ref_format(ref))
 443                 die("'%s' is not a valid tag name.", tag);
 444
 445         if (!resolve_ref(ref, prev, 1, NULL))
 446                 hashclr(prev);
 447         else if (!force)
 448                 die("tag '%s' already exists", tag);
 449
 450         if (annotate)
 451                 create_tag(object, tag, message, sign, object);
 452
 453         lock = lock_any_ref_for_update(ref, prev, 0);
 454         if (!lock)
 455                 die("%s: cannot lock the ref", ref);
 456         if (write_ref_sha1(lock, object, NULL) < 0)
 457                 die("%s: cannot update the ref", ref);
 458
 459         return 0;
 460 }