Andrew's git / gitweb.git / builtin-tag.c
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builtin-tag.con commit Teach git mergetool to use custom commands defined at config time (964473a)
   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
  16static 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
  24static char signingkey[1000];
  25
  26void 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
  54                if (strcspn(editor, "$ \t'") != len) {
  55                        /* there are specials */
  56                        args[i++] = "sh";
  57                        args[i++] = "-c";
  58                        args[i++] = "$0 \"$@\"";
  59                }
  60                args[i++] = editor;
  61                args[i++] = path;
  62                args[i] = NULL;
  63
  64                if (run_command_v_opt_cd_env(args, 0, NULL, env))
  65                        die("There was a problem with the editor %s.", editor);
  66        }
  67
  68        if (!buffer)
  69                return;
  70        if (strbuf_read_file(buffer, path, 0) < 0)
  71                die("could not read message file '%s': %s",
  72                    path, strerror(errno));
  73}
  74
  75struct tag_filter {
  76        const char *pattern;
  77        int lines;
  78};
  79
  80#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  81
  82static int show_reference(const char *refname, const unsigned char *sha1,
  83                          int flag, void *cb_data)
  84{
  85        struct tag_filter *filter = cb_data;
  86
  87        if (!fnmatch(filter->pattern, refname, 0)) {
  88                int i;
  89                unsigned long size;
  90                enum object_type type;
  91                char *buf, *sp, *eol;
  92                size_t len;
  93
  94                if (!filter->lines) {
  95                        printf("%s\n", refname);
  96                        return 0;
  97                }
  98                printf("%-15s ", refname);
  99
 100                buf = read_sha1_file(sha1, &type, &size);
 101                if (!buf || !size)
 102                        return 0;
 103
 104                /* skip header */
 105                sp = strstr(buf, "\n\n");
 106                if (!sp) {
 107                        free(buf);
 108                        return 0;
 109                }
 110                /* only take up to "lines" lines, and strip the signature */
 111                for (i = 0, sp += 2;
 112                                i < filter->lines && sp < buf + size &&
 113                                prefixcmp(sp, PGP_SIGNATURE "\n");
 114                                i++) {
 115                        if (i)
 116                                printf("\n    ");
 117                        eol = memchr(sp, '\n', size - (sp - buf));
 118                        len = eol ? eol - sp : size - (sp - buf);
 119                        fwrite(sp, len, 1, stdout);
 120                        if (!eol)
 121                                break;
 122                        sp = eol + 1;
 123                }
 124                putchar('\n');
 125                free(buf);
 126        }
 127
 128        return 0;
 129}
 130
 131static int list_tags(const char *pattern, int lines)
 132{
 133        struct tag_filter filter;
 134
 135        if (pattern == NULL)
 136                pattern = "*";
 137
 138        filter.pattern = pattern;
 139        filter.lines = lines;
 140
 141        for_each_tag_ref(show_reference, (void *) &filter);
 142
 143        return 0;
 144}
 145
 146typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 147                                const unsigned char *sha1);
 148
 149static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 150{
 151        const char **p;
 152        char ref[PATH_MAX];
 153        int had_error = 0;
 154        unsigned char sha1[20];
 155
 156        for (p = argv; *p; p++) {
 157                if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 158                                        >= sizeof(ref)) {
 159                        error("tag name too long: %.*s...", 50, *p);
 160                        had_error = 1;
 161                        continue;
 162                }
 163                if (!resolve_ref(ref, sha1, 1, NULL)) {
 164                        error("tag '%s' not found.", *p);
 165                        had_error = 1;
 166                        continue;
 167                }
 168                if (fn(*p, ref, sha1))
 169                        had_error = 1;
 170        }
 171        return had_error;
 172}
 173
 174static int delete_tag(const char *name, const char *ref,
 175                                const unsigned char *sha1)
 176{
 177        if (delete_ref(ref, sha1))
 178                return 1;
 179        printf("Deleted tag '%s'\n", name);
 180        return 0;
 181}
 182
 183static int verify_tag(const char *name, const char *ref,
 184                                const unsigned char *sha1)
 185{
 186        const char *argv_verify_tag[] = {"git-verify-tag",
 187                                        "-v", "SHA1_HEX", NULL};
 188        argv_verify_tag[2] = sha1_to_hex(sha1);
 189
 190        if (run_command_v_opt(argv_verify_tag, 0))
 191                return error("could not verify the tag '%s'", name);
 192        return 0;
 193}
 194
 195static int do_sign(struct strbuf *buffer)
 196{
 197        struct child_process gpg;
 198        const char *args[4];
 199        char *bracket;
 200        int len;
 201
 202        if (!*signingkey) {
 203                if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 204                                sizeof(signingkey)) > sizeof(signingkey) - 1)
 205                        return error("committer info too long.");
 206                bracket = strchr(signingkey, '>');
 207                if (bracket)
 208                        bracket[1] = '\0';
 209        }
 210
 211        /* When the username signingkey is bad, program could be terminated
 212         * because gpg exits without reading and then write gets SIGPIPE. */
 213        signal(SIGPIPE, SIG_IGN);
 214
 215        memset(&gpg, 0, sizeof(gpg));
 216        gpg.argv = args;
 217        gpg.in = -1;
 218        gpg.out = -1;
 219        args[0] = "gpg";
 220        args[1] = "-bsau";
 221        args[2] = signingkey;
 222        args[3] = NULL;
 223
 224        if (start_command(&gpg))
 225                return error("could not run gpg.");
 226
 227        if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 228                close(gpg.in);
 229                close(gpg.out);
 230                finish_command(&gpg);
 231                return error("gpg did not accept the tag data");
 232        }
 233        close(gpg.in);
 234        len = strbuf_read(buffer, gpg.out, 1024);
 235        close(gpg.out);
 236
 237        if (finish_command(&gpg) || !len || len < 0)
 238                return error("gpg failed to sign the tag");
 239
 240        return 0;
 241}
 242
 243static const char tag_template[] =
 244        "\n"
 245        "#\n"
 246        "# Write a tag message\n"
 247        "#\n";
 248
 249static void set_signingkey(const char *value)
 250{
 251        if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 252                die("signing key value too long (%.10s...)", value);
 253}
 254
 255static int git_tag_config(const char *var, const char *value)
 256{
 257        if (!strcmp(var, "user.signingkey")) {
 258                if (!value)
 259                        return config_error_nonbool(value);
 260                set_signingkey(value);
 261                return 0;
 262        }
 263
 264        return git_default_config(var, value);
 265}
 266
 267static void write_tag_body(int fd, const unsigned char *sha1)
 268{
 269        unsigned long size;
 270        enum object_type type;
 271        char *buf, *sp, *eob;
 272        size_t len;
 273
 274        buf = read_sha1_file(sha1, &type, &size);
 275        if (!buf)
 276                return;
 277        /* skip header */
 278        sp = strstr(buf, "\n\n");
 279
 280        if (!sp || !size || type != OBJ_TAG) {
 281                free(buf);
 282                return;
 283        }
 284        sp += 2; /* skip the 2 LFs */
 285        eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 286        if (eob)
 287                len = eob - sp;
 288        else
 289                len = buf + size - sp;
 290        write_or_die(fd, sp, len);
 291
 292        free(buf);
 293}
 294
 295static void create_tag(const unsigned char *object, const char *tag,
 296                       struct strbuf *buf, int message, int sign,
 297                       unsigned char *prev, unsigned char *result)
 298{
 299        enum object_type type;
 300        char header_buf[1024];
 301        int header_len;
 302
 303        type = sha1_object_info(object, NULL);
 304        if (type <= OBJ_NONE)
 305            die("bad object type.");
 306
 307        header_len = snprintf(header_buf, sizeof(header_buf),
 308                          "object %s\n"
 309                          "type %s\n"
 310                          "tag %s\n"
 311                          "tagger %s\n\n",
 312                          sha1_to_hex(object),
 313                          typename(type),
 314                          tag,
 315                          git_committer_info(IDENT_ERROR_ON_NO_NAME));
 316
 317        if (header_len > sizeof(header_buf) - 1)
 318                die("tag header too big.");
 319
 320        if (!message) {
 321                char *path;
 322                int fd;
 323
 324                /* write the template message before editing: */
 325                path = xstrdup(git_path("TAG_EDITMSG"));
 326                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 327                if (fd < 0)
 328                        die("could not create file '%s': %s",
 329                                                path, strerror(errno));
 330
 331                if (!is_null_sha1(prev))
 332                        write_tag_body(fd, prev);
 333                else
 334                        write_or_die(fd, tag_template, strlen(tag_template));
 335                close(fd);
 336
 337                launch_editor(path, buf, NULL);
 338
 339                unlink(path);
 340                free(path);
 341        }
 342
 343        stripspace(buf, 1);
 344
 345        if (!message && !buf->len)
 346                die("no tag message?");
 347
 348        strbuf_insert(buf, 0, header_buf, header_len);
 349
 350        if (sign && do_sign(buf) < 0)
 351                die("unable to sign the tag");
 352        if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 353                die("unable to write tag file");
 354}
 355
 356struct msg_arg {
 357        int given;
 358        struct strbuf buf;
 359};
 360
 361static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 362{
 363        struct msg_arg *msg = opt->value;
 364
 365        if (!arg)
 366                return -1;
 367        if (msg->buf.len)
 368                strbuf_addstr(&(msg->buf), "\n\n");
 369        strbuf_addstr(&(msg->buf), arg);
 370        msg->given = 1;
 371        return 0;
 372}
 373
 374int cmd_tag(int argc, const char **argv, const char *prefix)
 375{
 376        struct strbuf buf;
 377        unsigned char object[20], prev[20];
 378        char ref[PATH_MAX];
 379        const char *object_ref, *tag;
 380        struct ref_lock *lock;
 381
 382        int annotate = 0, sign = 0, force = 0, lines = 0,
 383                list = 0, delete = 0, verify = 0;
 384        char *msgfile = NULL, *keyid = NULL;
 385        struct msg_arg msg = { 0, STRBUF_INIT };
 386        struct option options[] = {
 387                OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 388                { OPTION_INTEGER, 'n', NULL, &lines, NULL,
 389                                "print n lines of each tag message",
 390                                PARSE_OPT_OPTARG, NULL, 1 },
 391                OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 392                OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 393
 394                OPT_GROUP("Tag creation options"),
 395                OPT_BOOLEAN('a', NULL, &annotate,
 396                                        "annotated tag, needs a message"),
 397                OPT_CALLBACK('m', NULL, &msg, "msg",
 398                             "message for the tag", parse_msg_arg),
 399                OPT_STRING('F', NULL, &msgfile, "file", "message in a file"),
 400                OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 401                OPT_STRING('u', NULL, &keyid, "key-id",
 402                                        "use another key to sign the tag"),
 403                OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
 404                OPT_END()
 405        };
 406
 407        git_config(git_tag_config);
 408
 409        argc = parse_options(argc, argv, options, git_tag_usage, 0);
 410
 411        if (keyid) {
 412                sign = 1;
 413                set_signingkey(keyid);
 414        }
 415        if (sign)
 416                annotate = 1;
 417
 418        if (list)
 419                return list_tags(argv[0], lines);
 420        if (delete)
 421                return for_each_tag_name(argv, delete_tag);
 422        if (verify)
 423                return for_each_tag_name(argv, verify_tag);
 424
 425        strbuf_init(&buf, 0);
 426        if (msg.given || msgfile) {
 427                if (msg.given && msgfile)
 428                        die("only one -F or -m option is allowed.");
 429                annotate = 1;
 430                if (msg.given)
 431                        strbuf_addbuf(&buf, &(msg.buf));
 432                else {
 433                        if (!strcmp(msgfile, "-")) {
 434                                if (strbuf_read(&buf, 0, 1024) < 0)
 435                                        die("cannot read %s", msgfile);
 436                        } else {
 437                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 438                                        die("could not open or read '%s': %s",
 439                                                msgfile, strerror(errno));
 440                        }
 441                }
 442        }
 443
 444        if (argc == 0) {
 445                if (annotate)
 446                        usage_with_options(git_tag_usage, options);
 447                return list_tags(NULL, lines);
 448        }
 449        tag = argv[0];
 450
 451        object_ref = argc == 2 ? argv[1] : "HEAD";
 452        if (argc > 2)
 453                die("too many params");
 454
 455        if (get_sha1(object_ref, object))
 456                die("Failed to resolve '%s' as a valid ref.", object_ref);
 457
 458        if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 459                die("tag name too long: %.*s...", 50, tag);
 460        if (check_ref_format(ref))
 461                die("'%s' is not a valid tag name.", tag);
 462
 463        if (!resolve_ref(ref, prev, 1, NULL))
 464                hashclr(prev);
 465        else if (!force)
 466                die("tag '%s' already exists", tag);
 467
 468        if (annotate)
 469                create_tag(object, tag, &buf, msg.given || msgfile,
 470                           sign, prev, object);
 471
 472        lock = lock_any_ref_for_update(ref, prev, 0);
 473        if (!lock)
 474                die("%s: cannot lock the ref", ref);
 475        if (write_ref_sha1(lock, object, NULL) < 0)
 476                die("%s: cannot update the ref", ref);
 477
 478        strbuf_release(&buf);
 479        return 0;
 480}