Andrew's git - gitweb.git/blob

   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
  15static 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
  18static char signingkey[1000];
  19
  20static 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)
  55                die("could not read message file '%s': %s",
  56                    path, strerror(errno));
  57}
  58
  59struct tag_filter {
  60        const char *pattern;
  61        int lines;
  62};
  63
  64#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
  65
  66static 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                sp = buf = read_sha1_file(sha1, &type, &size);
  85                if (!buf)
  86                        return 0;
  87                if (!size) {
  88                        free(buf);
  89                        return 0;
  90                }
  91                /* skip header */
  92                while (sp + 1 < buf + size &&
  93                                !(sp[0] == '\n' && sp[1] == '\n'))
  94                        sp++;
  95                /* only take up to "lines" lines, and strip the signature */
  96                for (i = 0, sp += 2;
  97                                i < filter->lines && sp < buf + size &&
  98                                prefixcmp(sp, PGP_SIGNATURE "\n");
  99                                i++) {
 100                        if (i)
 101                                printf("\n    ");
 102                        eol = memchr(sp, '\n', size - (sp - buf));
 103                        len = eol ? eol - sp : size - (sp - buf);
 104                        fwrite(sp, len, 1, stdout);
 105                        if (!eol)
 106                                break;
 107                        sp = eol + 1;
 108                }
 109                putchar('\n');
 110                free(buf);
 111        }
 112
 113        return 0;
 114}
 115
 116static int list_tags(const char *pattern, int lines)
 117{
 118        struct tag_filter filter;
 119
 120        if (pattern == NULL)
 121                pattern = "*";
 122
 123        filter.pattern = pattern;
 124        filter.lines = lines;
 125
 126        for_each_tag_ref(show_reference, (void *) &filter);
 127
 128        return 0;
 129}
 130
 131typedef int (*each_tag_name_fn)(const char *name, const char *ref,
 132                                const unsigned char *sha1);
 133
 134static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
 135{
 136        const char **p;
 137        char ref[PATH_MAX];
 138        int had_error = 0;
 139        unsigned char sha1[20];
 140
 141        for (p = argv; *p; p++) {
 142                if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
 143                                        >= sizeof(ref)) {
 144                        error("tag name too long: %.*s...", 50, *p);
 145                        had_error = 1;
 146                        continue;
 147                }
 148                if (!resolve_ref(ref, sha1, 1, NULL)) {
 149                        error("tag '%s' not found.", *p);
 150                        had_error = 1;
 151                        continue;
 152                }
 153                if (fn(*p, ref, sha1))
 154                        had_error = 1;
 155        }
 156        return had_error;
 157}
 158
 159static int delete_tag(const char *name, const char *ref,
 160                                const unsigned char *sha1)
 161{
 162        if (delete_ref(ref, sha1))
 163                return 1;
 164        printf("Deleted tag '%s'\n", name);
 165        return 0;
 166}
 167
 168static int verify_tag(const char *name, const char *ref,
 169                                const unsigned char *sha1)
 170{
 171        const char *argv_verify_tag[] = {"git-verify-tag",
 172                                        "-v", "SHA1_HEX", NULL};
 173        argv_verify_tag[2] = sha1_to_hex(sha1);
 174
 175        if (run_command_v_opt(argv_verify_tag, 0))
 176                return error("could not verify the tag '%s'", name);
 177        return 0;
 178}
 179
 180static int do_sign(struct strbuf *buffer)
 181{
 182        struct child_process gpg;
 183        const char *args[4];
 184        char *bracket;
 185        int len;
 186
 187        if (!*signingkey) {
 188                if (strlcpy(signingkey, git_committer_info(1),
 189                                sizeof(signingkey)) > sizeof(signingkey) - 1)
 190                        return error("committer info too long.");
 191                bracket = strchr(signingkey, '>');
 192                if (bracket)
 193                        bracket[1] = '\0';
 194        }
 195
 196        /* When the username signingkey is bad, program could be terminated
 197         * because gpg exits without reading and then write gets SIGPIPE. */
 198        signal(SIGPIPE, SIG_IGN);
 199
 200        memset(&gpg, 0, sizeof(gpg));
 201        gpg.argv = args;
 202        gpg.in = -1;
 203        gpg.out = -1;
 204        args[0] = "gpg";
 205        args[1] = "-bsau";
 206        args[2] = signingkey;
 207        args[3] = NULL;
 208
 209        if (start_command(&gpg))
 210                return error("could not run gpg.");
 211
 212        if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
 213                close(gpg.in);
 214                finish_command(&gpg);
 215                return error("gpg did not accept the tag data");
 216        }
 217        close(gpg.in);
 218        gpg.close_in = 0;
 219        len = strbuf_read(buffer, gpg.out, 1024);
 220
 221        if (finish_command(&gpg) || !len || len < 0)
 222                return error("gpg failed to sign the tag");
 223
 224        if (len < 0)
 225                return error("could not read the entire signature from gpg.");
 226
 227        return 0;
 228}
 229
 230static const char tag_template[] =
 231        "\n"
 232        "#\n"
 233        "# Write a tag message\n"
 234        "#\n";
 235
 236static int git_tag_config(const char *var, const char *value)
 237{
 238        if (!strcmp(var, "user.signingkey")) {
 239                if (!value)
 240                        die("user.signingkey without value");
 241                if (strlcpy(signingkey, value, sizeof(signingkey))
 242                                                >= sizeof(signingkey))
 243                        die("user.signingkey value too long");
 244                return 0;
 245        }
 246
 247        return git_default_config(var, value);
 248}
 249
 250static void create_tag(const unsigned char *object, const char *tag,
 251                       struct strbuf *buf, int message, int sign,
 252                           unsigned char *result)
 253{
 254        enum object_type type;
 255        char header_buf[1024];
 256        int header_len;
 257
 258        type = sha1_object_info(object, NULL);
 259        if (type <= OBJ_NONE)
 260            die("bad object type.");
 261
 262        header_len = snprintf(header_buf, sizeof(header_buf),
 263                          "object %s\n"
 264                          "type %s\n"
 265                          "tag %s\n"
 266                          "tagger %s\n\n",
 267                          sha1_to_hex(object),
 268                          typename(type),
 269                          tag,
 270                          git_committer_info(1));
 271
 272        if (header_len > sizeof(header_buf) - 1)
 273                die("tag header too big.");
 274
 275        if (!message) {
 276                char *path;
 277                int fd;
 278
 279                /* write the template message before editing: */
 280                path = xstrdup(git_path("TAG_EDITMSG"));
 281                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 282                if (fd < 0)
 283                        die("could not create file '%s': %s",
 284                                                path, strerror(errno));
 285                write_or_die(fd, tag_template, strlen(tag_template));
 286                close(fd);
 287
 288                launch_editor(path, buf);
 289
 290                unlink(path);
 291                free(path);
 292        }
 293
 294        stripspace(buf, 1);
 295
 296        if (!message && !buf->len)
 297                die("no tag message?");
 298
 299        strbuf_insert(buf, 0, header_buf, header_len);
 300
 301        if (sign && do_sign(buf) < 0)
 302                die("unable to sign the tag");
 303        if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
 304                die("unable to write tag file");
 305}
 306
 307int cmd_tag(int argc, const char **argv, const char *prefix)
 308{
 309        struct strbuf buf;
 310        unsigned char object[20], prev[20];
 311        int annotate = 0, sign = 0, force = 0, lines = 0, message = 0;
 312        char ref[PATH_MAX];
 313        const char *object_ref, *tag;
 314        int i;
 315        struct ref_lock *lock;
 316
 317        git_config(git_tag_config);
 318        strbuf_init(&buf, 0);
 319
 320        for (i = 1; i < argc; i++) {
 321                const char *arg = argv[i];
 322
 323                if (arg[0] != '-')
 324                        break;
 325                if (!strcmp(arg, "-a")) {
 326                        annotate = 1;
 327                        continue;
 328                }
 329                if (!strcmp(arg, "-s")) {
 330                        annotate = 1;
 331                        sign = 1;
 332                        continue;
 333                }
 334                if (!strcmp(arg, "-f")) {
 335                        force = 1;
 336                        continue;
 337                }
 338                if (!strcmp(arg, "-n")) {
 339                        if (i + 1 == argc || *argv[i + 1] == '-')
 340                                /* no argument */
 341                                lines = 1;
 342                        else
 343                                lines = isdigit(*argv[++i]) ?
 344                                        atoi(argv[i]) : 1;
 345                        continue;
 346                }
 347                if (!strcmp(arg, "-m")) {
 348                        annotate = 1;
 349                        i++;
 350                        if (i == argc)
 351                                die("option -m needs an argument.");
 352                        if (message)
 353                                die("only one -F or -m option is allowed.");
 354                        strbuf_addstr(&buf, argv[i]);
 355                        message = 1;
 356                        continue;
 357                }
 358                if (!strcmp(arg, "-F")) {
 359                        int fd;
 360
 361                        annotate = 1;
 362                        i++;
 363                        if (i == argc)
 364                                die("option -F needs an argument.");
 365                        if (message)
 366                                die("only one -F or -m option is allowed.");
 367
 368                        if (!strcmp(argv[i], "-"))
 369                                fd = 0;
 370                        else {
 371                                fd = open(argv[i], O_RDONLY);
 372                                if (fd < 0)
 373                                        die("could not open '%s': %s",
 374                                                argv[i], strerror(errno));
 375                        }
 376                        if (strbuf_read(&buf, fd, 1024) < 0) {
 377                                die("cannot read %s", argv[i]);
 378                        }
 379                        message = 1;
 380                        continue;
 381                }
 382                if (!strcmp(arg, "-u")) {
 383                        annotate = 1;
 384                        sign = 1;
 385                        i++;
 386                        if (i == argc)
 387                                die("option -u needs an argument.");
 388                        if (strlcpy(signingkey, argv[i], sizeof(signingkey))
 389                                                        >= sizeof(signingkey))
 390                                die("argument to option -u too long");
 391                        continue;
 392                }
 393                if (!strcmp(arg, "-l"))
 394                        return list_tags(argv[i + 1], lines);
 395                if (!strcmp(arg, "-d"))
 396                        return for_each_tag_name(argv + i + 1, delete_tag);
 397                if (!strcmp(arg, "-v"))
 398                        return for_each_tag_name(argv + i + 1, verify_tag);
 399                usage(builtin_tag_usage);
 400        }
 401
 402        if (i == argc) {
 403                if (annotate)
 404                        usage(builtin_tag_usage);
 405                return list_tags(NULL, lines);
 406        }
 407        tag = argv[i++];
 408
 409        object_ref = i < argc ? argv[i] : "HEAD";
 410        if (i + 1 < argc)
 411                die("too many params");
 412
 413        if (get_sha1(object_ref, object))
 414                die("Failed to resolve '%s' as a valid ref.", object_ref);
 415
 416        if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) > sizeof(ref) - 1)
 417                die("tag name too long: %.*s...", 50, tag);
 418        if (check_ref_format(ref))
 419                die("'%s' is not a valid tag name.", tag);
 420
 421        if (!resolve_ref(ref, prev, 1, NULL))
 422                hashclr(prev);
 423        else if (!force)
 424                die("tag '%s' already exists", tag);
 425
 426        if (annotate)
 427                create_tag(object, tag, &buf, message, sign, object);
 428
 429        lock = lock_any_ref_for_update(ref, prev, 0);
 430        if (!lock)
 431                die("%s: cannot lock the ref", ref);
 432        if (write_ref_sha1(lock, object, NULL) < 0)
 433                die("%s: cannot update the ref", ref);
 434
 435        strbuf_release(&buf);
 436        return 0;
 437}