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 "config.h"
  11 #include "builtin.h"
  12 #include "refs.h"
  13 #include "object-store.h"
  14 #include "tag.h"
  15 #include "run-command.h"
  16 #include "parse-options.h"
  17 #include "diff.h"
  18 #include "revision.h"
  19 #include "gpg-interface.h"
  20 #include "oid-array.h"
  21 #include "column.h"
  22 #include "ref-filter.h"
  23
  24 static const char * const git_tag_usage[] = {
  25         N_("git tag [-a | -s | -u <key-id>] [-f] [-m <msg> | -F <file>]\n"
  26                 "\t\t<tagname> [<head>]"),
  27         N_("git tag -d <tagname>..."),
  28         N_("git tag -l [-n[<num>]] [--contains <commit>] [--no-contains <commit>] [--points-at <object>]\n"
  29                 "\t\t[--format=<format>] [--merged <commit>] [--no-merged <commit>] [<pattern>...]"),
  30         N_("git tag -v [--format=<format>] <tagname>..."),
  31         NULL
  32 };
  33
  34 static unsigned int colopts;
  35 static int force_sign_annotate;
  36 static int config_sign_tag = -1; /* unspecified */
  37
  38 static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting,
  39                      struct ref_format *format)
  40 {
  41         struct ref_array array;
  42         struct strbuf output = STRBUF_INIT;
  43         struct strbuf err = STRBUF_INIT;
  44         char *to_free = NULL;
  45         int i;
  46
  47         memset(&array, 0, sizeof(array));
  48
  49         if (filter->lines == -1)
  50                 filter->lines = 0;
  51
  52         if (!format->format) {
  53                 if (filter->lines) {
  54                         to_free = xstrfmt("%s %%(contents:lines=%d)",
  55                                           "%(align:15)%(refname:lstrip=2)%(end)",
  56                                           filter->lines);
  57                         format->format = to_free;
  58                 } else
  59                         format->format = "%(refname:lstrip=2)";
  60         }
  61
  62         if (verify_ref_format(format))
  63                 die(_("unable to parse format string"));
  64         filter->with_commit_tag_algo = 1;
  65         filter_refs(&array, filter, FILTER_REFS_TAGS);
  66         ref_array_sort(sorting, &array);
  67
  68         for (i = 0; i < array.nr; i++) {
  69                 strbuf_reset(&output);
  70                 strbuf_reset(&err);
  71                 if (format_ref_array_item(array.items[i], format, &output, &err))
  72                         die("%s", err.buf);
  73                 fwrite(output.buf, 1, output.len, stdout);
  74                 putchar('\n');
  75         }
  76
  77         strbuf_release(&err);
  78         strbuf_release(&output);
  79         ref_array_clear(&array);
  80         free(to_free);
  81
  82         return 0;
  83 }
  84
  85 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
  86                                 const struct object_id *oid, void *cb_data);
  87
  88 static int for_each_tag_name(const char **argv, each_tag_name_fn fn,
  89                              void *cb_data)
  90 {
  91         const char **p;
  92         struct strbuf ref = STRBUF_INIT;
  93         int had_error = 0;
  94         struct object_id oid;
  95
  96         for (p = argv; *p; p++) {
  97                 strbuf_reset(&ref);
  98                 strbuf_addf(&ref, "refs/tags/%s", *p);
  99                 if (read_ref(ref.buf, &oid)) {
 100                         error(_("tag '%s' not found."), *p);
 101                         had_error = 1;
 102                         continue;
 103                 }
 104                 if (fn(*p, ref.buf, &oid, cb_data))
 105                         had_error = 1;
 106         }
 107         strbuf_release(&ref);
 108         return had_error;
 109 }
 110
 111 static int collect_tags(const char *name, const char *ref,
 112                         const struct object_id *oid, void *cb_data)
 113 {
 114         struct string_list *ref_list = cb_data;
 115
 116         string_list_append(ref_list, ref);
 117         ref_list->items[ref_list->nr - 1].util = oiddup(oid);
 118         return 0;
 119 }
 120
 121 static int delete_tags(const char **argv)
 122 {
 123         int result;
 124         struct string_list refs_to_delete = STRING_LIST_INIT_DUP;
 125         struct string_list_item *item;
 126
 127         result = for_each_tag_name(argv, collect_tags, (void *)&refs_to_delete);
 128         if (delete_refs(NULL, &refs_to_delete, REF_NO_DEREF))
 129                 result = 1;
 130
 131         for_each_string_list_item(item, &refs_to_delete) {
 132                 const char *name = item->string;
 133                 struct object_id *oid = item->util;
 134                 if (!ref_exists(name))
 135                         printf(_("Deleted tag '%s' (was %s)\n"),
 136                                 item->string + 10,
 137                                 find_unique_abbrev(oid, DEFAULT_ABBREV));
 138
 139                 free(oid);
 140         }
 141         string_list_clear(&refs_to_delete, 0);
 142         return result;
 143 }
 144
 145 static int verify_tag(const char *name, const char *ref,
 146                       const struct object_id *oid, void *cb_data)
 147 {
 148         int flags;
 149         const struct ref_format *format = cb_data;
 150         flags = GPG_VERIFY_VERBOSE;
 151
 152         if (format->format)
 153                 flags = GPG_VERIFY_OMIT_STATUS;
 154
 155         if (gpg_verify_tag(oid, name, flags))
 156                 return -1;
 157
 158         if (format->format)
 159                 pretty_print_ref(name, oid, format);
 160
 161         return 0;
 162 }
 163
 164 static int do_sign(struct strbuf *buffer)
 165 {
 166         return sign_buffer(buffer, buffer, get_signing_key());
 167 }
 168
 169 static const char tag_template[] =
 170         N_("\nWrite a message for tag:\n  %s\n"
 171         "Lines starting with '%c' will be ignored.\n");
 172
 173 static const char tag_template_nocleanup[] =
 174         N_("\nWrite a message for tag:\n  %s\n"
 175         "Lines starting with '%c' will be kept; you may remove them"
 176         " yourself if you want to.\n");
 177
 178 static int git_tag_config(const char *var, const char *value, void *cb)
 179 {
 180         int status;
 181         struct ref_sorting **sorting_tail = (struct ref_sorting **)cb;
 182
 183         if (!strcmp(var, "tag.gpgsign")) {
 184                 config_sign_tag = git_config_bool(var, value);
 185                 return 0;
 186         }
 187
 188         if (!strcmp(var, "tag.sort")) {
 189                 if (!value)
 190                         return config_error_nonbool(var);
 191                 parse_ref_sorting(sorting_tail, value);
 192                 return 0;
 193         }
 194
 195         status = git_gpg_config(var, value, cb);
 196         if (status)
 197                 return status;
 198         if (!strcmp(var, "tag.forcesignannotated")) {
 199                 force_sign_annotate = git_config_bool(var, value);
 200                 return 0;
 201         }
 202
 203         if (starts_with(var, "column."))
 204                 return git_column_config(var, value, "tag", &colopts);
 205         return git_color_default_config(var, value, cb);
 206 }
 207
 208 static void write_tag_body(int fd, const struct object_id *oid)
 209 {
 210         unsigned long size;
 211         enum object_type type;
 212         char *buf, *sp, *orig;
 213         struct strbuf payload = STRBUF_INIT;
 214         struct strbuf signature = STRBUF_INIT;
 215
 216         orig = buf = read_object_file(oid, &type, &size);
 217         if (!buf)
 218                 return;
 219         if (parse_signature(buf, size, &payload, &signature)) {
 220                 buf = payload.buf;
 221                 size = payload.len;
 222         }
 223         /* skip header */
 224         sp = strstr(buf, "\n\n");
 225
 226         if (!sp || !size || type != OBJ_TAG) {
 227                 free(buf);
 228                 return;
 229         }
 230         sp += 2; /* skip the 2 LFs */
 231         write_or_die(fd, sp, buf + size - sp);
 232
 233         free(orig);
 234         strbuf_release(&payload);
 235         strbuf_release(&signature);
 236 }
 237
 238 static int build_tag_object(struct strbuf *buf, int sign, struct object_id *result)
 239 {
 240         if (sign && do_sign(buf) < 0)
 241                 return error(_("unable to sign the tag"));
 242         if (write_object_file(buf->buf, buf->len, tag_type, result) < 0)
 243                 return error(_("unable to write tag file"));
 244         return 0;
 245 }
 246
 247 struct create_tag_options {
 248         unsigned int message_given:1;
 249         unsigned int use_editor:1;
 250         unsigned int sign;
 251         enum {
 252                 CLEANUP_NONE,
 253                 CLEANUP_SPACE,
 254                 CLEANUP_ALL
 255         } cleanup_mode;
 256 };
 257
 258 static const char message_advice_nested_tag[] =
 259         N_("You have created a nested tag. The object referred to by your new tag is\n"
 260            "already a tag. If you meant to tag the object that it points to, use:\n"
 261            "\n"
 262            "\tgit tag -f %s %s^{}");
 263
 264 static void create_tag(const struct object_id *object, const char *object_ref,
 265                        const char *tag,
 266                        struct strbuf *buf, struct create_tag_options *opt,
 267                        struct object_id *prev, struct object_id *result)
 268 {
 269         enum object_type type;
 270         struct strbuf header = STRBUF_INIT;
 271         char *path = NULL;
 272
 273         type = oid_object_info(the_repository, object, NULL);
 274         if (type <= OBJ_NONE)
 275                 die(_("bad object type."));
 276
 277         if (type == OBJ_TAG)
 278                 advise_if_enabled(ADVICE_NESTED_TAG, _(message_advice_nested_tag),
 279                                   tag, object_ref);
 280
 281         strbuf_addf(&header,
 282                     "object %s\n"
 283                     "type %s\n"
 284                     "tag %s\n"
 285                     "tagger %s\n\n",
 286                     oid_to_hex(object),
 287                     type_name(type),
 288                     tag,
 289                     git_committer_info(IDENT_STRICT));
 290
 291         if (!opt->message_given || opt->use_editor) {
 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_errno(_("could not create file '%s'"), path);
 299
 300                 if (opt->message_given) {
 301                         write_or_die(fd, buf->buf, buf->len);
 302                         strbuf_reset(buf);
 303                 } else if (!is_null_oid(prev)) {
 304                         write_tag_body(fd, prev);
 305                 } else {
 306                         struct strbuf buf = STRBUF_INIT;
 307                         strbuf_addch(&buf, '\n');
 308                         if (opt->cleanup_mode == CLEANUP_ALL)
 309                                 strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
 310                         else
 311                                 strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
 312                         write_or_die(fd, buf.buf, buf.len);
 313                         strbuf_release(&buf);
 314                 }
 315                 close(fd);
 316
 317                 if (launch_editor(path, buf, NULL)) {
 318                         fprintf(stderr,
 319                         _("Please supply the message using either -m or -F option.\n"));
 320                         exit(1);
 321                 }
 322         }
 323
 324         if (opt->cleanup_mode != CLEANUP_NONE)
 325                 strbuf_stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 326
 327         if (!opt->message_given && !buf->len)
 328                 die(_("no tag message?"));
 329
 330         strbuf_insert(buf, 0, header.buf, header.len);
 331         strbuf_release(&header);
 332
 333         if (build_tag_object(buf, opt->sign, result) < 0) {
 334                 if (path)
 335                         fprintf(stderr, _("The tag message has been left in %s\n"),
 336                                 path);
 337                 exit(128);
 338         }
 339         if (path) {
 340                 unlink_or_warn(path);
 341                 free(path);
 342         }
 343 }
 344
 345 static void create_reflog_msg(const struct object_id *oid, struct strbuf *sb)
 346 {
 347         enum object_type type;
 348         struct commit *c;
 349         char *buf;
 350         unsigned long size;
 351         int subject_len = 0;
 352         const char *subject_start;
 353
 354         char *rla = getenv("GIT_REFLOG_ACTION");
 355         if (rla) {
 356                 strbuf_addstr(sb, rla);
 357         } else {
 358                 strbuf_addstr(sb, "tag: tagging ");
 359                 strbuf_add_unique_abbrev(sb, oid, DEFAULT_ABBREV);
 360         }
 361
 362         strbuf_addstr(sb, " (");
 363         type = oid_object_info(the_repository, oid, NULL);
 364         switch (type) {
 365         default:
 366                 strbuf_addstr(sb, "object of unknown type");
 367                 break;
 368         case OBJ_COMMIT:
 369                 if ((buf = read_object_file(oid, &type, &size)) != NULL) {
 370                         subject_len = find_commit_subject(buf, &subject_start);
 371                         strbuf_insert(sb, sb->len, subject_start, subject_len);
 372                 } else {
 373                         strbuf_addstr(sb, "commit object");
 374                 }
 375                 free(buf);
 376
 377                 if ((c = lookup_commit_reference(the_repository, oid)) != NULL)
 378                         strbuf_addf(sb, ", %s", show_date(c->date, 0, DATE_MODE(SHORT)));
 379                 break;
 380         case OBJ_TREE:
 381                 strbuf_addstr(sb, "tree object");
 382                 break;
 383         case OBJ_BLOB:
 384                 strbuf_addstr(sb, "blob object");
 385                 break;
 386         case OBJ_TAG:
 387                 strbuf_addstr(sb, "other tag object");
 388                 break;
 389         }
 390         strbuf_addch(sb, ')');
 391 }
 392
 393 struct msg_arg {
 394         int given;
 395         struct strbuf buf;
 396 };
 397
 398 static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 399 {
 400         struct msg_arg *msg = opt->value;
 401
 402         BUG_ON_OPT_NEG(unset);
 403
 404         if (!arg)
 405                 return -1;
 406         if (msg->buf.len)
 407                 strbuf_addstr(&(msg->buf), "\n\n");
 408         strbuf_addstr(&(msg->buf), arg);
 409         msg->given = 1;
 410         return 0;
 411 }
 412
 413 static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
 414 {
 415         if (name[0] == '-')
 416                 return -1;
 417
 418         strbuf_reset(sb);
 419         strbuf_addf(sb, "refs/tags/%s", name);
 420
 421         return check_refname_format(sb->buf, 0);
 422 }
 423
 424 int cmd_tag(int argc, const char **argv, const char *prefix)
 425 {
 426         struct strbuf buf = STRBUF_INIT;
 427         struct strbuf ref = STRBUF_INIT;
 428         struct strbuf reflog_msg = STRBUF_INIT;
 429         struct object_id object, prev;
 430         const char *object_ref, *tag;
 431         struct create_tag_options opt;
 432         char *cleanup_arg = NULL;
 433         int create_reflog = 0;
 434         int annotate = 0, force = 0;
 435         int cmdmode = 0, create_tag_object = 0;
 436         const char *msgfile = NULL, *keyid = NULL;
 437         struct msg_arg msg = { 0, STRBUF_INIT };
 438         struct ref_transaction *transaction;
 439         struct strbuf err = STRBUF_INIT;
 440         struct ref_filter filter;
 441         static struct ref_sorting *sorting = NULL, **sorting_tail = &sorting;
 442         struct ref_format format = REF_FORMAT_INIT;
 443         int icase = 0;
 444         int edit_flag = 0;
 445         struct option options[] = {
 446                 OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
 447                 { OPTION_INTEGER, 'n', NULL, &filter.lines, N_("n"),
 448                                 N_("print <n> lines of each tag message"),
 449                                 PARSE_OPT_OPTARG, NULL, 1 },
 450                 OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
 451                 OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 452
 453                 OPT_GROUP(N_("Tag creation options")),
 454                 OPT_BOOL('a', "annotate", &annotate,
 455                                         N_("annotated tag, needs a message")),
 456                 OPT_CALLBACK_F('m', "message", &msg, N_("message"),
 457                                N_("tag message"), PARSE_OPT_NONEG, parse_msg_arg),
 458                 OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
 459                 OPT_BOOL('e', "edit", &edit_flag, N_("force edit of tag message")),
 460                 OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 461                 OPT_CLEANUP(&cleanup_arg),
 462                 OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 463                                         N_("use another key to sign the tag")),
 464                 OPT__FORCE(&force, N_("replace the tag if exists"), 0),
 465                 OPT_BOOL(0, "create-reflog", &create_reflog, N_("create a reflog")),
 466
 467                 OPT_GROUP(N_("Tag listing options")),
 468                 OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
 469                 OPT_CONTAINS(&filter.with_commit, N_("print only tags that contain the commit")),
 470                 OPT_NO_CONTAINS(&filter.no_commit, N_("print only tags that don't contain the commit")),
 471                 OPT_WITH(&filter.with_commit, N_("print only tags that contain the commit")),
 472                 OPT_WITHOUT(&filter.no_commit, N_("print only tags that don't contain the commit")),
 473                 OPT_MERGED(&filter, N_("print only tags that are merged")),
 474                 OPT_NO_MERGED(&filter, N_("print only tags that are not merged")),
 475                 OPT_REF_SORT(sorting_tail),
 476                 {
 477                         OPTION_CALLBACK, 0, "points-at", &filter.points_at, N_("object"),
 478                         N_("print only tags of the object"), PARSE_OPT_LASTARG_DEFAULT,
 479                         parse_opt_object_name, (intptr_t) "HEAD"
 480                 },
 481                 OPT_STRING(  0 , "format", &format.format, N_("format"),
 482                            N_("format to use for the output")),
 483                 OPT__COLOR(&format.use_color, N_("respect format colors")),
 484                 OPT_BOOL('i', "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
 485                 OPT_END()
 486         };
 487
 488         setup_ref_filter_porcelain_msg();
 489
 490         git_config(git_tag_config, sorting_tail);
 491
 492         memset(&opt, 0, sizeof(opt));
 493         memset(&filter, 0, sizeof(filter));
 494         filter.lines = -1;
 495         opt.sign = -1;
 496
 497         argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 498
 499         if (!cmdmode) {
 500                 if (argc == 0)
 501                         cmdmode = 'l';
 502                 else if (filter.with_commit || filter.no_commit ||
 503                          filter.reachable_from || filter.unreachable_from ||
 504                          filter.points_at.nr || filter.lines != -1)
 505                         cmdmode = 'l';
 506         }
 507
 508         if (cmdmode == 'l')
 509                 setup_auto_pager("tag", 1);
 510
 511         if (opt.sign == -1)
 512                 opt.sign = cmdmode ? 0 : config_sign_tag > 0;
 513
 514         if (keyid) {
 515                 opt.sign = 1;
 516                 set_signing_key(keyid);
 517         }
 518         create_tag_object = (opt.sign || annotate || msg.given || msgfile);
 519
 520         if ((create_tag_object || force) && (cmdmode != 0))
 521                 usage_with_options(git_tag_usage, options);
 522
 523         finalize_colopts(&colopts, -1);
 524         if (cmdmode == 'l' && filter.lines != -1) {
 525                 if (explicitly_enable_column(colopts))
 526                         die(_("--column and -n are incompatible"));
 527                 colopts = 0;
 528         }
 529         if (!sorting)
 530                 sorting = ref_default_sorting();
 531         ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
 532         filter.ignore_case = icase;
 533         if (cmdmode == 'l') {
 534                 int ret;
 535                 if (column_active(colopts)) {
 536                         struct column_options copts;
 537                         memset(&copts, 0, sizeof(copts));
 538                         copts.padding = 2;
 539                         run_column_filter(colopts, &copts);
 540                 }
 541                 filter.name_patterns = argv;
 542                 ret = list_tags(&filter, sorting, &format);
 543                 if (column_active(colopts))
 544                         stop_column_filter();
 545                 return ret;
 546         }
 547         if (filter.lines != -1)
 548                 die(_("-n option is only allowed in list mode"));
 549         if (filter.with_commit)
 550                 die(_("--contains option is only allowed in list mode"));
 551         if (filter.no_commit)
 552                 die(_("--no-contains option is only allowed in list mode"));
 553         if (filter.points_at.nr)
 554                 die(_("--points-at option is only allowed in list mode"));
 555         if (filter.reachable_from || filter.unreachable_from)
 556                 die(_("--merged and --no-merged options are only allowed in list mode"));
 557         if (cmdmode == 'd')
 558                 return delete_tags(argv);
 559         if (cmdmode == 'v') {
 560                 if (format.format && verify_ref_format(&format))
 561                         usage_with_options(git_tag_usage, options);
 562                 return for_each_tag_name(argv, verify_tag, &format);
 563         }
 564
 565         if (msg.given || msgfile) {
 566                 if (msg.given && msgfile)
 567                         die(_("only one -F or -m option is allowed."));
 568                 if (msg.given)
 569                         strbuf_addbuf(&buf, &(msg.buf));
 570                 else {
 571                         if (!strcmp(msgfile, "-")) {
 572                                 if (strbuf_read(&buf, 0, 1024) < 0)
 573                                         die_errno(_("cannot read '%s'"), msgfile);
 574                         } else {
 575                                 if (strbuf_read_file(&buf, msgfile, 1024) < 0)
 576                                         die_errno(_("could not open or read '%s'"),
 577                                                 msgfile);
 578                         }
 579                 }
 580         }
 581
 582         tag = argv[0];
 583
 584         object_ref = argc == 2 ? argv[1] : "HEAD";
 585         if (argc > 2)
 586                 die(_("too many arguments"));
 587
 588         if (get_oid(object_ref, &object))
 589                 die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 590
 591         if (strbuf_check_tag_ref(&ref, tag))
 592                 die(_("'%s' is not a valid tag name."), tag);
 593
 594         if (read_ref(ref.buf, &prev))
 595                 oidclr(&prev);
 596         else if (!force)
 597                 die(_("tag '%s' already exists"), tag);
 598
 599         opt.message_given = msg.given || msgfile;
 600         opt.use_editor = edit_flag;
 601
 602         if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
 603                 opt.cleanup_mode = CLEANUP_ALL;
 604         else if (!strcmp(cleanup_arg, "verbatim"))
 605                 opt.cleanup_mode = CLEANUP_NONE;
 606         else if (!strcmp(cleanup_arg, "whitespace"))
 607                 opt.cleanup_mode = CLEANUP_SPACE;
 608         else
 609                 die(_("Invalid cleanup mode %s"), cleanup_arg);
 610
 611         create_reflog_msg(&object, &reflog_msg);
 612
 613         if (create_tag_object) {
 614                 if (force_sign_annotate && !annotate)
 615                         opt.sign = 1;
 616                 create_tag(&object, object_ref, tag, &buf, &opt, &prev, &object);
 617         }
 618
 619         transaction = ref_transaction_begin(&err);
 620         if (!transaction ||
 621             ref_transaction_update(transaction, ref.buf, &object, &prev,
 622                                    create_reflog ? REF_FORCE_CREATE_REFLOG : 0,
 623                                    reflog_msg.buf, &err) ||
 624             ref_transaction_commit(transaction, &err))
 625                 die("%s", err.buf);
 626         ref_transaction_free(transaction);
 627         if (force && !is_null_oid(&prev) && !oideq(&prev, &object))
 628                 printf(_("Updated tag '%s' (was %s)\n"), tag,
 629                        find_unique_abbrev(&prev, DEFAULT_ABBREV));
 630
 631         UNLEAK(buf);
 632         UNLEAK(ref);
 633         UNLEAK(reflog_msg);
 634         UNLEAK(msg);
 635         UNLEAK(err);
 636         return 0;
 637 }