Andrew's git / gitweb.git / builtin-tag.c
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builtin-tag.con commit git-sh-setup: Fix scripts whose PWD is a symlink into a git work-dir (08fc060)
   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
  26struct tag_filter {
  27        const char *pattern;
  28        int lines;
  29};
  30
  31#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  32
  33static int show_reference(const char *refname, const unsigned char *sha1,
  34                          int flag, void *cb_data)
  35{
  36        struct tag_filter *filter = cb_data;
  37
  38        if (!fnmatch(filter->pattern, refname, 0)) {
  39                int i;
  40                unsigned long size;
  41                enum object_type type;
  42                char *buf, *sp, *eol;
  43                size_t len;
  44
  45                if (!filter->lines) {
  46                        printf("%s\n", refname);
  47                        return 0;
  48                }
  49                printf("%-15s ", refname);
  50
  51                buf = read_sha1_file(sha1, &type, &size);
  52                if (!buf || !size)
  53                        return 0;
  54
  55                /* skip header */
  56                sp = strstr(buf, "\n\n");
  57                if (!sp) {
  58                        free(buf);
  59                        return 0;
  60                }
  61                /* only take up to "lines" lines, and strip the signature */
  62                for (i = 0, sp += 2;
  63                                i < filter->lines && sp < buf + size &&
  64                                prefixcmp(sp, PGP_SIGNATURE "\n");
  65                                i++) {
  66                        if (i)
  67                                printf("\n    ");
  68                        eol = memchr(sp, '\n', size - (sp - buf));
  69                        len = eol ? eol - sp : size - (sp - buf);
  70                        fwrite(sp, len, 1, stdout);
  71                        if (!eol)
  72                                break;
  73                        sp = eol + 1;
  74                }
  75                putchar('\n');
  76                free(buf);
  77        }
  78
  79        return 0;
  80}
  81
  82static int list_tags(const char *pattern, int lines)
  83{
  84        struct tag_filter filter;
  85
  86        if (pattern == NULL)
  87                pattern = "*";
  88
  89        filter.pattern = pattern;
  90        filter.lines = lines;
  91
  92        for_each_tag_ref(show_reference, (void *) &filter);
  93
  94        return 0;
  95}
  96
  97typedef int (*each_tag_name_fn)(const char *name, const char *ref,
  98                                const unsigned char *sha1);
  99
 100static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 101{
 102        const char **p;
 103        char ref[PATH_MAX];
 104        int had_error = 0;
 105        unsigned char sha1[20];
 106
 107        for (p = argv; *p; p++) {
 108                if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 109                                        >= sizeof(ref)) {
 110                        error("tag name too long: %.*s...", 50, *p);
 111                        had_error = 1;
 112                        continue;
 113                }
 114                if (!resolve_ref(ref, sha1, 1, NULL)) {
 115                        error("tag '%s' not found.", *p);
 116                        had_error = 1;
 117                        continue;
 118                }
 119                if (fn(*p, ref, sha1))
 120                        had_error = 1;
 121        }
 122        return had_error;
 123}
 124
 125static int delete_tag(const char *name, const char *ref,
 126                                const unsigned char *sha1)
 127{
 128        if (delete_ref(ref, sha1, 0))
 129                return 1;
 130        printf("Deleted tag '%s'\n", name);
 131        return 0;
 132}
 133
 134static int verify_tag(const char *name, const char *ref,
 135                                const unsigned char *sha1)
 136{
 137        const char *argv_verify_tag[] = {"git-verify-tag",
 138                                        "-v", "SHA1_HEX", NULL};
 139        argv_verify_tag[2] = sha1_to_hex(sha1);
 140
 141        if (run_command_v_opt(argv_verify_tag, 0))
 142                return error("could not verify the tag '%s'", name);
 143        return 0;
 144}
 145
 146static int do_sign(struct strbuf *buffer)
 147{
 148        struct child_process gpg;
 149        const char *args[4];
 150        char *bracket;
 151        int len;
 152        int i, j;
 153
 154        if (!*signingkey) {
 155                if (strlcpy(signingkey, git_committer_info(IDENT_ERROR_ON_NO_NAME),
 156                                sizeof(signingkey)) > sizeof(signingkey) - 1)
 157                        return error("committer info too long.");
 158                bracket = strchr(signingkey, '>');
 159                if (bracket)
 160                        bracket[1] = '\0';
 161        }
 162
 163        /* When the username signingkey is bad, program could be terminated
 164         * because gpg exits without reading and then write gets SIGPIPE. */
 165        signal(SIGPIPE, SIG_IGN);
 166
 167        memset(&gpg, 0, sizeof(gpg));
 168        gpg.argv = args;
 169        gpg.in = -1;
 170        gpg.out = -1;
 171        args[0] = "gpg";
 172        args[1] = "-bsau";
 173        args[2] = signingkey;
 174        args[3] = NULL;
 175
 176        if (start_command(&gpg))
 177                return error("could not run gpg.");
 178
 179        if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 180                close(gpg.in);
 181                close(gpg.out);
 182                finish_command(&gpg);
 183                return error("gpg did not accept the tag data");
 184        }
 185        close(gpg.in);
 186        len = strbuf_read(buffer, gpg.out, 1024);
 187        close(gpg.out);
 188
 189        if (finish_command(&gpg) || !len || len < 0)
 190                return error("gpg failed to sign the tag");
 191
 192        /* Strip CR from the line endings, in case we are on Windows. */
 193        for (i = j = 0; i < buffer->len; i++)
 194                if (buffer->buf[i] != '\r') {
 195                        if (i != j)
 196                                buffer->buf[j] = buffer->buf[i];
 197                        j++;
 198                }
 199        strbuf_setlen(buffer, j);
 200
 201        return 0;
 202}
 203
 204static const char tag_template[] =
 205        "\n"
 206        "#\n"
 207        "# Write a tag message\n"
 208        "#\n";
 209
 210static void set_signingkey(const char *value)
 211{
 212        if (strlcpy(signingkey, value, sizeof(signingkey)) >= sizeof(signingkey))
 213                die("signing key value too long (%.10s...)", value);
 214}
 215
 216static int git_tag_config(const char *var, const char *value, void *cb)
 217{
 218        if (!strcmp(var, "user.signingkey")) {
 219                if (!value)
 220                        return config_error_nonbool(var);
 221                set_signingkey(value);
 222                return 0;
 223        }
 224
 225        return git_default_config(var, value, cb);
 226}
 227
 228static void write_tag_body(int fd, const unsigned char *sha1)
 229{
 230        unsigned long size;
 231        enum object_type type;
 232        char *buf, *sp, *eob;
 233        size_t len;
 234
 235        buf = read_sha1_file(sha1, &type, &size);
 236        if (!buf)
 237                return;
 238        /* skip header */
 239        sp = strstr(buf, "\n\n");
 240
 241        if (!sp || !size || type != OBJ_TAG) {
 242                free(buf);
 243                return;
 244        }
 245        sp += 2; /* skip the 2 LFs */
 246        eob = strstr(sp, "\n" PGP_SIGNATURE "\n");
 247        if (eob)
 248                len = eob - sp;
 249        else
 250                len = buf + size - sp;
 251        write_or_die(fd, sp, len);
 252
 253        free(buf);
 254}
 255
 256static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 257{
 258        if (sign && do_sign(buf) < 0)
 259                return error("unable to sign the tag");
 260        if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 261                return error("unable to write tag file");
 262        return 0;
 263}
 264
 265static void create_tag(const unsigned char *object, const char *tag,
 266                       struct strbuf *buf, int message, int sign,
 267                       unsigned char *prev, unsigned char *result)
 268{
 269        enum object_type type;
 270        char header_buf[1024];
 271        int header_len;
 272        char *path = NULL;
 273
 274        type = sha1_object_info(object, NULL);
 275        if (type <= OBJ_NONE)
 276            die("bad object type.");
 277
 278        header_len = snprintf(header_buf, sizeof(header_buf),
 279                          "object %s\n"
 280                          "type %s\n"
 281                          "tag %s\n"
 282                          "tagger %s\n\n",
 283                          sha1_to_hex(object),
 284                          typename(type),
 285                          tag,
 286                          git_committer_info(IDENT_ERROR_ON_NO_NAME));
 287
 288        if (header_len > sizeof(header_buf) - 1)
 289                die("tag header too big.");
 290
 291        if (!message) {
 292                int fd;
 293
 294                /* write the template message before editing: */
 295                path = git_pathdup("TAG_EDITMSG");
 296                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 297                if (fd < 0)
 298                        die("could not create file '%s': %s",
 299                                                path, strerror(errno));
 300
 301                if (!is_null_sha1(prev))
 302                        write_tag_body(fd, prev);
 303                else
 304                        write_or_die(fd, tag_template, strlen(tag_template));
 305                close(fd);
 306
 307                if (launch_editor(path, buf, NULL)) {
 308                        fprintf(stderr,
 309                        "Please supply the message using either -m or -F option.\n");
 310                        exit(1);
 311                }
 312        }
 313
 314        stripspace(buf, 1);
 315
 316        if (!message && !buf->len)
 317                die("no tag message?");
 318
 319        strbuf_insert(buf, 0, header_buf, header_len);
 320
 321        if (build_tag_object(buf, sign, result) < 0) {
 322                if (path)
 323                        fprintf(stderr, "The tag message has been left in %s\n",
 324                                path);
 325                exit(128);
 326        }
 327        if (path) {
 328                unlink(path);
 329                free(path);
 330        }
 331}
 332
 333struct msg_arg {
 334        int given;
 335        struct strbuf buf;
 336};
 337
 338static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 339{
 340        struct msg_arg *msg = opt->value;
 341
 342        if (!arg)
 343                return -1;
 344        if (msg->buf.len)
 345                strbuf_addstr(&(msg->buf), "\n\n");
 346        strbuf_addstr(&(msg->buf), arg);
 347        msg->given = 1;
 348        return 0;
 349}
 350
 351int cmd_tag(int argc, const char **argv, const char *prefix)
 352{
 353        struct strbuf buf = STRBUF_INIT;
 354        unsigned char object[20], prev[20];
 355        char ref[PATH_MAX];
 356        const char *object_ref, *tag;
 357        struct ref_lock *lock;
 358
 359        int annotate = 0, sign = 0, force = 0, lines = -1,
 360                list = 0, delete = 0, verify = 0;
 361        const char *msgfile = NULL, *keyid = NULL;
 362        struct msg_arg msg = { 0, STRBUF_INIT };
 363        struct option options[] = {
 364                OPT_BOOLEAN('l', NULL, &list, "list tag names"),
 365                { OPTION_INTEGER, 'n', NULL, &lines, NULL,
 366                                "print n lines of each tag message",
 367                                PARSE_OPT_OPTARG, NULL, 1 },
 368                OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
 369                OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
 370
 371                OPT_GROUP("Tag creation options"),
 372                OPT_BOOLEAN('a', NULL, &annotate,
 373                                        "annotated tag, needs a message"),
 374                OPT_CALLBACK('m', NULL, &msg, "msg",
 375                             "message for the tag", parse_msg_arg),
 376                OPT_STRING('F', NULL, &msgfile, "file", "message in a file"),
 377                OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 378                OPT_STRING('u', NULL, &keyid, "key-id",
 379                                        "use another key to sign the tag"),
 380                OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
 381                OPT_END()
 382        };
 383
 384        git_config(git_tag_config, NULL);
 385
 386        argc = parse_options(argc, argv, options, git_tag_usage, 0);
 387        msgfile = parse_options_fix_filename(prefix, msgfile);
 388
 389        if (keyid) {
 390                sign = 1;
 391                set_signingkey(keyid);
 392        }
 393        if (sign)
 394                annotate = 1;
 395        if (argc == 0 && !(delete || verify))
 396                list = 1;
 397
 398        if ((annotate || msg.given || msgfile || force) &&
 399            (list || delete || verify))
 400                usage_with_options(git_tag_usage, options);
 401
 402        if (list + delete + verify > 1)
 403                usage_with_options(git_tag_usage, options);
 404        if (list)
 405                return list_tags(argv[0], lines == -1 ? 0 : lines);
 406        if (lines != -1)
 407                die("-n option is only allowed with -l.");
 408        if (delete)
 409                return for_each_tag_name(argv, delete_tag);
 410        if (verify)
 411                return for_each_tag_name(argv, verify_tag);
 412
 413        if (msg.given || msgfile) {
 414                if (msg.given && msgfile)
 415                        die("only one -F or -m option is allowed.");
 416                annotate = 1;
 417                if (msg.given)
 418                        strbuf_addbuf(&buf, &(msg.buf));
 419                else {
 420                        if (!strcmp(msgfile, "-")) {
 421                                if (strbuf_read(&buf, 0, 1024) < 0)
 422                                        die("cannot read %s", msgfile);
 423                        } else {
 424                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 425                                        die("could not open or read '%s': %s",
 426                                                msgfile, strerror(errno));
 427                        }
 428                }
 429        }
 430
 431        tag = argv[0];
 432
 433        object_ref = argc == 2 ? argv[1] : "HEAD";
 434        if (argc > 2)
 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, &buf, msg.given || msgfile,
 452                           sign, prev, object);
 453
 454        lock = lock_any_ref_for_update(ref, prev, 0);
 455        if (!lock)
 456                die("%s: cannot lock the ref", ref);
 457        if (write_ref_sha1(lock, object, NULL) < 0)
 458                die("%s: cannot update the ref", ref);
 459
 460        strbuf_release(&buf);
 461        return 0;
 462}