Andrew's git / gitweb.git / builtin/cat-file.c
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builtin / cat-file.con commit checkout: print something when checking out paths (0f086e6)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "config.h"
   8#include "builtin.h"
   9#include "diff.h"
  10#include "parse-options.h"
  11#include "userdiff.h"
  12#include "streaming.h"
  13#include "tree-walk.h"
  14#include "sha1-array.h"
  15#include "packfile.h"
  16#include "object-store.h"
  17
  18struct batch_options {
  19        int enabled;
  20        int follow_symlinks;
  21        int print_contents;
  22        int buffer_output;
  23        int all_objects;
  24        int unordered;
  25        int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */
  26        const char *format;
  27};
  28
  29static const char *force_path;
  30
  31static int filter_object(const char *path, unsigned mode,
  32                         const struct object_id *oid,
  33                         char **buf, unsigned long *size)
  34{
  35        enum object_type type;
  36
  37        *buf = read_object_file(oid, &type, size);
  38        if (!*buf)
  39                return error(_("cannot read object %s '%s'"),
  40                             oid_to_hex(oid), path);
  41        if ((type == OBJ_BLOB) && S_ISREG(mode)) {
  42                struct strbuf strbuf = STRBUF_INIT;
  43                if (convert_to_working_tree(&the_index, path, *buf, *size, &strbuf)) {
  44                        free(*buf);
  45                        *size = strbuf.len;
  46                        *buf = strbuf_detach(&strbuf, NULL);
  47                }
  48        }
  49
  50        return 0;
  51}
  52
  53static int stream_blob(const struct object_id *oid)
  54{
  55        if (stream_blob_to_fd(1, oid, NULL, 0))
  56                die("unable to stream %s to stdout", oid_to_hex(oid));
  57        return 0;
  58}
  59
  60static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
  61                        int unknown_type)
  62{
  63        struct object_id oid;
  64        enum object_type type;
  65        char *buf;
  66        unsigned long size;
  67        struct object_context obj_context;
  68        struct object_info oi = OBJECT_INFO_INIT;
  69        struct strbuf sb = STRBUF_INIT;
  70        unsigned flags = OBJECT_INFO_LOOKUP_REPLACE;
  71        const char *path = force_path;
  72
  73        if (unknown_type)
  74                flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
  75
  76        if (get_oid_with_context(obj_name, GET_OID_RECORD_PATH,
  77                                 &oid, &obj_context))
  78                die("Not a valid object name %s", obj_name);
  79
  80        if (!path)
  81                path = obj_context.path;
  82        if (obj_context.mode == S_IFINVALID)
  83                obj_context.mode = 0100644;
  84
  85        buf = NULL;
  86        switch (opt) {
  87        case 't':
  88                oi.type_name = &sb;
  89                if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
  90                        die("git cat-file: could not get object info");
  91                if (sb.len) {
  92                        printf("%s\n", sb.buf);
  93                        strbuf_release(&sb);
  94                        return 0;
  95                }
  96                break;
  97
  98        case 's':
  99                oi.sizep = &size;
 100                if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
 101                        die("git cat-file: could not get object info");
 102                printf("%lu\n", size);
 103                return 0;
 104
 105        case 'e':
 106                return !has_object_file(&oid);
 107
 108        case 'w':
 109                if (!path)
 110                        die("git cat-file --filters %s: <object> must be "
 111                            "<sha1:path>", obj_name);
 112
 113                if (filter_object(path, obj_context.mode,
 114                                  &oid, &buf, &size))
 115                        return -1;
 116                break;
 117
 118        case 'c':
 119                if (!path)
 120                        die("git cat-file --textconv %s: <object> must be <sha1:path>",
 121                            obj_name);
 122
 123                if (textconv_object(the_repository, path, obj_context.mode,
 124                                    &oid, 1, &buf, &size))
 125                        break;
 126                /* else fallthrough */
 127
 128        case 'p':
 129                type = oid_object_info(the_repository, &oid, NULL);
 130                if (type < 0)
 131                        die("Not a valid object name %s", obj_name);
 132
 133                /* custom pretty-print here */
 134                if (type == OBJ_TREE) {
 135                        const char *ls_args[3] = { NULL };
 136                        ls_args[0] =  "ls-tree";
 137                        ls_args[1] =  obj_name;
 138                        return cmd_ls_tree(2, ls_args, NULL);
 139                }
 140
 141                if (type == OBJ_BLOB)
 142                        return stream_blob(&oid);
 143                buf = read_object_file(&oid, &type, &size);
 144                if (!buf)
 145                        die("Cannot read object %s", obj_name);
 146
 147                /* otherwise just spit out the data */
 148                break;
 149
 150        case 0:
 151                if (type_from_string(exp_type) == OBJ_BLOB) {
 152                        struct object_id blob_oid;
 153                        if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 154                                char *buffer = read_object_file(&oid, &type,
 155                                                                &size);
 156                                const char *target;
 157                                if (!skip_prefix(buffer, "object ", &target) ||
 158                                    get_oid_hex(target, &blob_oid))
 159                                        die("%s not a valid tag", oid_to_hex(&oid));
 160                                free(buffer);
 161                        } else
 162                                oidcpy(&blob_oid, &oid);
 163
 164                        if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
 165                                return stream_blob(&blob_oid);
 166                        /*
 167                         * we attempted to dereference a tag to a blob
 168                         * and failed; there may be new dereference
 169                         * mechanisms this code is not aware of.
 170                         * fall-back to the usual case.
 171                         */
 172                }
 173                buf = read_object_with_reference(&oid, exp_type, &size, NULL);
 174                break;
 175
 176        default:
 177                die("git cat-file: unknown option: %s", exp_type);
 178        }
 179
 180        if (!buf)
 181                die("git cat-file %s: bad file", obj_name);
 182
 183        write_or_die(1, buf, size);
 184        free(buf);
 185        free(obj_context.path);
 186        return 0;
 187}
 188
 189struct expand_data {
 190        struct object_id oid;
 191        enum object_type type;
 192        unsigned long size;
 193        off_t disk_size;
 194        const char *rest;
 195        struct object_id delta_base_oid;
 196
 197        /*
 198         * If mark_query is true, we do not expand anything, but rather
 199         * just mark the object_info with items we wish to query.
 200         */
 201        int mark_query;
 202
 203        /*
 204         * Whether to split the input on whitespace before feeding it to
 205         * get_sha1; this is decided during the mark_query phase based on
 206         * whether we have a %(rest) token in our format.
 207         */
 208        int split_on_whitespace;
 209
 210        /*
 211         * After a mark_query run, this object_info is set up to be
 212         * passed to sha1_object_info_extended. It will point to the data
 213         * elements above, so you can retrieve the response from there.
 214         */
 215        struct object_info info;
 216
 217        /*
 218         * This flag will be true if the requested batch format and options
 219         * don't require us to call sha1_object_info, which can then be
 220         * optimized out.
 221         */
 222        unsigned skip_object_info : 1;
 223};
 224
 225static int is_atom(const char *atom, const char *s, int slen)
 226{
 227        int alen = strlen(atom);
 228        return alen == slen && !memcmp(atom, s, alen);
 229}
 230
 231static void expand_atom(struct strbuf *sb, const char *atom, int len,
 232                        void *vdata)
 233{
 234        struct expand_data *data = vdata;
 235
 236        if (is_atom("objectname", atom, len)) {
 237                if (!data->mark_query)
 238                        strbuf_addstr(sb, oid_to_hex(&data->oid));
 239        } else if (is_atom("objecttype", atom, len)) {
 240                if (data->mark_query)
 241                        data->info.typep = &data->type;
 242                else
 243                        strbuf_addstr(sb, type_name(data->type));
 244        } else if (is_atom("objectsize", atom, len)) {
 245                if (data->mark_query)
 246                        data->info.sizep = &data->size;
 247                else
 248                        strbuf_addf(sb, "%lu", data->size);
 249        } else if (is_atom("objectsize:disk", atom, len)) {
 250                if (data->mark_query)
 251                        data->info.disk_sizep = &data->disk_size;
 252                else
 253                        strbuf_addf(sb, "%"PRIuMAX, (uintmax_t)data->disk_size);
 254        } else if (is_atom("rest", atom, len)) {
 255                if (data->mark_query)
 256                        data->split_on_whitespace = 1;
 257                else if (data->rest)
 258                        strbuf_addstr(sb, data->rest);
 259        } else if (is_atom("deltabase", atom, len)) {
 260                if (data->mark_query)
 261                        data->info.delta_base_sha1 = data->delta_base_oid.hash;
 262                else
 263                        strbuf_addstr(sb,
 264                                      oid_to_hex(&data->delta_base_oid));
 265        } else
 266                die("unknown format element: %.*s", len, atom);
 267}
 268
 269static size_t expand_format(struct strbuf *sb, const char *start, void *data)
 270{
 271        const char *end;
 272
 273        if (*start != '(')
 274                return 0;
 275        end = strchr(start + 1, ')');
 276        if (!end)
 277                die("format element '%s' does not end in ')'", start);
 278
 279        expand_atom(sb, start + 1, end - start - 1, data);
 280
 281        return end - start + 1;
 282}
 283
 284static void batch_write(struct batch_options *opt, const void *data, int len)
 285{
 286        if (opt->buffer_output) {
 287                if (fwrite(data, 1, len, stdout) != len)
 288                        die_errno("unable to write to stdout");
 289        } else
 290                write_or_die(1, data, len);
 291}
 292
 293static void print_object_or_die(struct batch_options *opt, struct expand_data *data)
 294{
 295        const struct object_id *oid = &data->oid;
 296
 297        assert(data->info.typep);
 298
 299        if (data->type == OBJ_BLOB) {
 300                if (opt->buffer_output)
 301                        fflush(stdout);
 302                if (opt->cmdmode) {
 303                        char *contents;
 304                        unsigned long size;
 305
 306                        if (!data->rest)
 307                                die("missing path for '%s'", oid_to_hex(oid));
 308
 309                        if (opt->cmdmode == 'w') {
 310                                if (filter_object(data->rest, 0100644, oid,
 311                                                  &contents, &size))
 312                                        die("could not convert '%s' %s",
 313                                            oid_to_hex(oid), data->rest);
 314                        } else if (opt->cmdmode == 'c') {
 315                                enum object_type type;
 316                                if (!textconv_object(the_repository,
 317                                                     data->rest, 0100644, oid,
 318                                                     1, &contents, &size))
 319                                        contents = read_object_file(oid,
 320                                                                    &type,
 321                                                                    &size);
 322                                if (!contents)
 323                                        die("could not convert '%s' %s",
 324                                            oid_to_hex(oid), data->rest);
 325                        } else
 326                                BUG("invalid cmdmode: %c", opt->cmdmode);
 327                        batch_write(opt, contents, size);
 328                        free(contents);
 329                } else {
 330                        stream_blob(oid);
 331                }
 332        }
 333        else {
 334                enum object_type type;
 335                unsigned long size;
 336                void *contents;
 337
 338                contents = read_object_file(oid, &type, &size);
 339                if (!contents)
 340                        die("object %s disappeared", oid_to_hex(oid));
 341                if (type != data->type)
 342                        die("object %s changed type!?", oid_to_hex(oid));
 343                if (data->info.sizep && size != data->size)
 344                        die("object %s changed size!?", oid_to_hex(oid));
 345
 346                batch_write(opt, contents, size);
 347                free(contents);
 348        }
 349}
 350
 351static void batch_object_write(const char *obj_name,
 352                               struct strbuf *scratch,
 353                               struct batch_options *opt,
 354                               struct expand_data *data)
 355{
 356        if (!data->skip_object_info &&
 357            oid_object_info_extended(the_repository, &data->oid, &data->info,
 358                                     OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 359                printf("%s missing\n",
 360                       obj_name ? obj_name : oid_to_hex(&data->oid));
 361                fflush(stdout);
 362                return;
 363        }
 364
 365        strbuf_reset(scratch);
 366        strbuf_expand(scratch, opt->format, expand_format, data);
 367        strbuf_addch(scratch, '\n');
 368        batch_write(opt, scratch->buf, scratch->len);
 369
 370        if (opt->print_contents) {
 371                print_object_or_die(opt, data);
 372                batch_write(opt, "\n", 1);
 373        }
 374}
 375
 376static void batch_one_object(const char *obj_name,
 377                             struct strbuf *scratch,
 378                             struct batch_options *opt,
 379                             struct expand_data *data)
 380{
 381        struct object_context ctx;
 382        int flags = opt->follow_symlinks ? GET_OID_FOLLOW_SYMLINKS : 0;
 383        enum follow_symlinks_result result;
 384
 385        result = get_oid_with_context(obj_name, flags, &data->oid, &ctx);
 386        if (result != FOUND) {
 387                switch (result) {
 388                case MISSING_OBJECT:
 389                        printf("%s missing\n", obj_name);
 390                        break;
 391                case DANGLING_SYMLINK:
 392                        printf("dangling %"PRIuMAX"\n%s\n",
 393                               (uintmax_t)strlen(obj_name), obj_name);
 394                        break;
 395                case SYMLINK_LOOP:
 396                        printf("loop %"PRIuMAX"\n%s\n",
 397                               (uintmax_t)strlen(obj_name), obj_name);
 398                        break;
 399                case NOT_DIR:
 400                        printf("notdir %"PRIuMAX"\n%s\n",
 401                               (uintmax_t)strlen(obj_name), obj_name);
 402                        break;
 403                default:
 404                        BUG("unknown get_sha1_with_context result %d\n",
 405                               result);
 406                        break;
 407                }
 408                fflush(stdout);
 409                return;
 410        }
 411
 412        if (ctx.mode == 0) {
 413                printf("symlink %"PRIuMAX"\n%s\n",
 414                       (uintmax_t)ctx.symlink_path.len,
 415                       ctx.symlink_path.buf);
 416                fflush(stdout);
 417                return;
 418        }
 419
 420        batch_object_write(obj_name, scratch, opt, data);
 421}
 422
 423struct object_cb_data {
 424        struct batch_options *opt;
 425        struct expand_data *expand;
 426        struct oidset *seen;
 427        struct strbuf *scratch;
 428};
 429
 430static int batch_object_cb(const struct object_id *oid, void *vdata)
 431{
 432        struct object_cb_data *data = vdata;
 433        oidcpy(&data->expand->oid, oid);
 434        batch_object_write(NULL, data->scratch, data->opt, data->expand);
 435        return 0;
 436}
 437
 438static int collect_loose_object(const struct object_id *oid,
 439                                const char *path,
 440                                void *data)
 441{
 442        oid_array_append(data, oid);
 443        return 0;
 444}
 445
 446static int collect_packed_object(const struct object_id *oid,
 447                                 struct packed_git *pack,
 448                                 uint32_t pos,
 449                                 void *data)
 450{
 451        oid_array_append(data, oid);
 452        return 0;
 453}
 454
 455static int batch_unordered_object(const struct object_id *oid, void *vdata)
 456{
 457        struct object_cb_data *data = vdata;
 458
 459        if (oidset_insert(data->seen, oid))
 460                return 0;
 461
 462        return batch_object_cb(oid, data);
 463}
 464
 465static int batch_unordered_loose(const struct object_id *oid,
 466                                 const char *path,
 467                                 void *data)
 468{
 469        return batch_unordered_object(oid, data);
 470}
 471
 472static int batch_unordered_packed(const struct object_id *oid,
 473                                  struct packed_git *pack,
 474                                  uint32_t pos,
 475                                  void *data)
 476{
 477        return batch_unordered_object(oid, data);
 478}
 479
 480static int batch_objects(struct batch_options *opt)
 481{
 482        struct strbuf input = STRBUF_INIT;
 483        struct strbuf output = STRBUF_INIT;
 484        struct expand_data data;
 485        int save_warning;
 486        int retval = 0;
 487
 488        if (!opt->format)
 489                opt->format = "%(objectname) %(objecttype) %(objectsize)";
 490
 491        /*
 492         * Expand once with our special mark_query flag, which will prime the
 493         * object_info to be handed to sha1_object_info_extended for each
 494         * object.
 495         */
 496        memset(&data, 0, sizeof(data));
 497        data.mark_query = 1;
 498        strbuf_expand(&output, opt->format, expand_format, &data);
 499        data.mark_query = 0;
 500        strbuf_release(&output);
 501        if (opt->cmdmode)
 502                data.split_on_whitespace = 1;
 503
 504        if (opt->all_objects) {
 505                struct object_info empty = OBJECT_INFO_INIT;
 506                if (!memcmp(&data.info, &empty, sizeof(empty)))
 507                        data.skip_object_info = 1;
 508        }
 509
 510        /*
 511         * If we are printing out the object, then always fill in the type,
 512         * since we will want to decide whether or not to stream.
 513         */
 514        if (opt->print_contents)
 515                data.info.typep = &data.type;
 516
 517        if (opt->all_objects) {
 518                struct object_cb_data cb;
 519
 520                if (repository_format_partial_clone)
 521                        warning("This repository has extensions.partialClone set. Some objects may not be loaded.");
 522
 523                cb.opt = opt;
 524                cb.expand = &data;
 525                cb.scratch = &output;
 526
 527                if (opt->unordered) {
 528                        struct oidset seen = OIDSET_INIT;
 529
 530                        cb.seen = &seen;
 531
 532                        for_each_loose_object(batch_unordered_loose, &cb, 0);
 533                        for_each_packed_object(batch_unordered_packed, &cb,
 534                                               FOR_EACH_OBJECT_PACK_ORDER);
 535
 536                        oidset_clear(&seen);
 537                } else {
 538                        struct oid_array sa = OID_ARRAY_INIT;
 539
 540                        for_each_loose_object(collect_loose_object, &sa, 0);
 541                        for_each_packed_object(collect_packed_object, &sa, 0);
 542
 543                        oid_array_for_each_unique(&sa, batch_object_cb, &cb);
 544
 545                        oid_array_clear(&sa);
 546                }
 547
 548                strbuf_release(&output);
 549                return 0;
 550        }
 551
 552        /*
 553         * We are going to call get_sha1 on a potentially very large number of
 554         * objects. In most large cases, these will be actual object sha1s. The
 555         * cost to double-check that each one is not also a ref (just so we can
 556         * warn) ends up dwarfing the actual cost of the object lookups
 557         * themselves. We can work around it by just turning off the warning.
 558         */
 559        save_warning = warn_on_object_refname_ambiguity;
 560        warn_on_object_refname_ambiguity = 0;
 561
 562        while (strbuf_getline(&input, stdin) != EOF) {
 563                if (data.split_on_whitespace) {
 564                        /*
 565                         * Split at first whitespace, tying off the beginning
 566                         * of the string and saving the remainder (or NULL) in
 567                         * data.rest.
 568                         */
 569                        char *p = strpbrk(input.buf, " \t");
 570                        if (p) {
 571                                while (*p && strchr(" \t", *p))
 572                                        *p++ = '\0';
 573                        }
 574                        data.rest = p;
 575                }
 576
 577                batch_one_object(input.buf, &output, opt, &data);
 578        }
 579
 580        strbuf_release(&input);
 581        strbuf_release(&output);
 582        warn_on_object_refname_ambiguity = save_warning;
 583        return retval;
 584}
 585
 586static const char * const cat_file_usage[] = {
 587        N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"),
 588        N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"),
 589        NULL
 590};
 591
 592static int git_cat_file_config(const char *var, const char *value, void *cb)
 593{
 594        if (userdiff_config(var, value) < 0)
 595                return -1;
 596
 597        return git_default_config(var, value, cb);
 598}
 599
 600static int batch_option_callback(const struct option *opt,
 601                                 const char *arg,
 602                                 int unset)
 603{
 604        struct batch_options *bo = opt->value;
 605
 606        if (bo->enabled) {
 607                return 1;
 608        }
 609
 610        bo->enabled = 1;
 611        bo->print_contents = !strcmp(opt->long_name, "batch");
 612        bo->format = arg;
 613
 614        return 0;
 615}
 616
 617int cmd_cat_file(int argc, const char **argv, const char *prefix)
 618{
 619        int opt = 0;
 620        const char *exp_type = NULL, *obj_name = NULL;
 621        struct batch_options batch = {0};
 622        int unknown_type = 0;
 623
 624        const struct option options[] = {
 625                OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 626                OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
 627                OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
 628                OPT_CMDMODE('e', NULL, &opt,
 629                            N_("exit with zero when there's no error"), 'e'),
 630                OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 631                OPT_CMDMODE(0, "textconv", &opt,
 632                            N_("for blob objects, run textconv on object's content"), 'c'),
 633                OPT_CMDMODE(0, "filters", &opt,
 634                            N_("for blob objects, run filters on object's content"), 'w'),
 635                OPT_STRING(0, "path", &force_path, N_("blob"),
 636                           N_("use a specific path for --textconv/--filters")),
 637                OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 638                          N_("allow -s and -t to work with broken/corrupt objects")),
 639                OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
 640                { OPTION_CALLBACK, 0, "batch", &batch, "format",
 641                        N_("show info and content of objects fed from the standard input"),
 642                        PARSE_OPT_OPTARG, batch_option_callback },
 643                { OPTION_CALLBACK, 0, "batch-check", &batch, "format",
 644                        N_("show info about objects fed from the standard input"),
 645                        PARSE_OPT_OPTARG, batch_option_callback },
 646                OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 647                         N_("follow in-tree symlinks (used with --batch or --batch-check)")),
 648                OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
 649                         N_("show all objects with --batch or --batch-check")),
 650                OPT_BOOL(0, "unordered", &batch.unordered,
 651                         N_("do not order --batch-all-objects output")),
 652                OPT_END()
 653        };
 654
 655        git_config(git_cat_file_config, NULL);
 656
 657        batch.buffer_output = -1;
 658        argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 659
 660        if (opt) {
 661                if (batch.enabled && (opt == 'c' || opt == 'w'))
 662                        batch.cmdmode = opt;
 663                else if (argc == 1)
 664                        obj_name = argv[0];
 665                else
 666                        usage_with_options(cat_file_usage, options);
 667        }
 668        if (!opt && !batch.enabled) {
 669                if (argc == 2) {
 670                        exp_type = argv[0];
 671                        obj_name = argv[1];
 672                } else
 673                        usage_with_options(cat_file_usage, options);
 674        }
 675        if (batch.enabled) {
 676                if (batch.cmdmode != opt || argc)
 677                        usage_with_options(cat_file_usage, options);
 678                if (batch.cmdmode && batch.all_objects)
 679                        die("--batch-all-objects cannot be combined with "
 680                            "--textconv nor with --filters");
 681        }
 682
 683        if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 684                usage_with_options(cat_file_usage, options);
 685        }
 686
 687        if (force_path && opt != 'c' && opt != 'w') {
 688                error("--path=<path> needs --textconv or --filters");
 689                usage_with_options(cat_file_usage, options);
 690        }
 691
 692        if (force_path && batch.enabled) {
 693                error("--path=<path> incompatible with --batch");
 694                usage_with_options(cat_file_usage, options);
 695        }
 696
 697        if (batch.buffer_output < 0)
 698                batch.buffer_output = batch.all_objects;
 699
 700        if (batch.enabled)
 701                return batch_objects(&batch);
 702
 703        if (unknown_type && opt != 't' && opt != 's')
 704                die("git cat-file --allow-unknown-type: use with -s or -t");
 705        return cat_one_file(opt, exp_type, obj_name, unknown_type);
 706}