Andrew's git / gitweb.git / builtin/cat-file.c
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builtin / cat-file.con commit Merge branch 'js/mingw-spawn-with-spaces-in-path' (a5194d8)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#define USE_THE_INDEX_COMPATIBILITY_MACROS
   7#include "cache.h"
   8#include "config.h"
   9#include "builtin.h"
  10#include "diff.h"
  11#include "parse-options.h"
  12#include "userdiff.h"
  13#include "streaming.h"
  14#include "tree-walk.h"
  15#include "sha1-array.h"
  16#include "packfile.h"
  17#include "object-store.h"
  18
  19struct batch_options {
  20        int enabled;
  21        int follow_symlinks;
  22        int print_contents;
  23        int buffer_output;
  24        int all_objects;
  25        int unordered;
  26        int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */
  27        const char *format;
  28};
  29
  30static const char *force_path;
  31
  32static int filter_object(const char *path, unsigned mode,
  33                         const struct object_id *oid,
  34                         char **buf, unsigned long *size)
  35{
  36        enum object_type type;
  37
  38        *buf = read_object_file(oid, &type, size);
  39        if (!*buf)
  40                return error(_("cannot read object %s '%s'"),
  41                             oid_to_hex(oid), path);
  42        if ((type == OBJ_BLOB) && S_ISREG(mode)) {
  43                struct strbuf strbuf = STRBUF_INIT;
  44                if (convert_to_working_tree(&the_index, path, *buf, *size, &strbuf)) {
  45                        free(*buf);
  46                        *size = strbuf.len;
  47                        *buf = strbuf_detach(&strbuf, NULL);
  48                }
  49        }
  50
  51        return 0;
  52}
  53
  54static int stream_blob(const struct object_id *oid)
  55{
  56        if (stream_blob_to_fd(1, oid, NULL, 0))
  57                die("unable to stream %s to stdout", oid_to_hex(oid));
  58        return 0;
  59}
  60
  61static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
  62                        int unknown_type)
  63{
  64        struct object_id oid;
  65        enum object_type type;
  66        char *buf;
  67        unsigned long size;
  68        struct object_context obj_context;
  69        struct object_info oi = OBJECT_INFO_INIT;
  70        struct strbuf sb = STRBUF_INIT;
  71        unsigned flags = OBJECT_INFO_LOOKUP_REPLACE;
  72        const char *path = force_path;
  73
  74        if (unknown_type)
  75                flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
  76
  77        if (get_oid_with_context(the_repository, obj_name,
  78                                 GET_OID_RECORD_PATH,
  79                                 &oid, &obj_context))
  80                die("Not a valid object name %s", obj_name);
  81
  82        if (!path)
  83                path = obj_context.path;
  84        if (obj_context.mode == S_IFINVALID)
  85                obj_context.mode = 0100644;
  86
  87        buf = NULL;
  88        switch (opt) {
  89        case 't':
  90                oi.type_name = &sb;
  91                if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
  92                        die("git cat-file: could not get object info");
  93                if (sb.len) {
  94                        printf("%s\n", sb.buf);
  95                        strbuf_release(&sb);
  96                        return 0;
  97                }
  98                break;
  99
 100        case 's':
 101                oi.sizep = &size;
 102                if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
 103                        die("git cat-file: could not get object info");
 104                printf("%"PRIuMAX"\n", (uintmax_t)size);
 105                return 0;
 106
 107        case 'e':
 108                return !has_object_file(&oid);
 109
 110        case 'w':
 111                if (!path)
 112                        die("git cat-file --filters %s: <object> must be "
 113                            "<sha1:path>", obj_name);
 114
 115                if (filter_object(path, obj_context.mode,
 116                                  &oid, &buf, &size))
 117                        return -1;
 118                break;
 119
 120        case 'c':
 121                if (!path)
 122                        die("git cat-file --textconv %s: <object> must be <sha1:path>",
 123                            obj_name);
 124
 125                if (textconv_object(the_repository, path, obj_context.mode,
 126                                    &oid, 1, &buf, &size))
 127                        break;
 128                /* else fallthrough */
 129
 130        case 'p':
 131                type = oid_object_info(the_repository, &oid, NULL);
 132                if (type < 0)
 133                        die("Not a valid object name %s", obj_name);
 134
 135                /* custom pretty-print here */
 136                if (type == OBJ_TREE) {
 137                        const char *ls_args[3] = { NULL };
 138                        ls_args[0] =  "ls-tree";
 139                        ls_args[1] =  obj_name;
 140                        return cmd_ls_tree(2, ls_args, NULL);
 141                }
 142
 143                if (type == OBJ_BLOB)
 144                        return stream_blob(&oid);
 145                buf = read_object_file(&oid, &type, &size);
 146                if (!buf)
 147                        die("Cannot read object %s", obj_name);
 148
 149                /* otherwise just spit out the data */
 150                break;
 151
 152        case 0:
 153                if (type_from_string(exp_type) == OBJ_BLOB) {
 154                        struct object_id blob_oid;
 155                        if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 156                                char *buffer = read_object_file(&oid, &type,
 157                                                                &size);
 158                                const char *target;
 159                                if (!skip_prefix(buffer, "object ", &target) ||
 160                                    get_oid_hex(target, &blob_oid))
 161                                        die("%s not a valid tag", oid_to_hex(&oid));
 162                                free(buffer);
 163                        } else
 164                                oidcpy(&blob_oid, &oid);
 165
 166                        if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
 167                                return stream_blob(&blob_oid);
 168                        /*
 169                         * we attempted to dereference a tag to a blob
 170                         * and failed; there may be new dereference
 171                         * mechanisms this code is not aware of.
 172                         * fall-back to the usual case.
 173                         */
 174                }
 175                buf = read_object_with_reference(the_repository,
 176                                                 &oid, exp_type, &size, NULL);
 177                break;
 178
 179        default:
 180                die("git cat-file: unknown option: %s", exp_type);
 181        }
 182
 183        if (!buf)
 184                die("git cat-file %s: bad file", obj_name);
 185
 186        write_or_die(1, buf, size);
 187        free(buf);
 188        free(obj_context.path);
 189        return 0;
 190}
 191
 192struct expand_data {
 193        struct object_id oid;
 194        enum object_type type;
 195        unsigned long size;
 196        off_t disk_size;
 197        const char *rest;
 198        struct object_id delta_base_oid;
 199
 200        /*
 201         * If mark_query is true, we do not expand anything, but rather
 202         * just mark the object_info with items we wish to query.
 203         */
 204        int mark_query;
 205
 206        /*
 207         * Whether to split the input on whitespace before feeding it to
 208         * get_sha1; this is decided during the mark_query phase based on
 209         * whether we have a %(rest) token in our format.
 210         */
 211        int split_on_whitespace;
 212
 213        /*
 214         * After a mark_query run, this object_info is set up to be
 215         * passed to oid_object_info_extended. It will point to the data
 216         * elements above, so you can retrieve the response from there.
 217         */
 218        struct object_info info;
 219
 220        /*
 221         * This flag will be true if the requested batch format and options
 222         * don't require us to call oid_object_info, which can then be
 223         * optimized out.
 224         */
 225        unsigned skip_object_info : 1;
 226};
 227
 228static int is_atom(const char *atom, const char *s, int slen)
 229{
 230        int alen = strlen(atom);
 231        return alen == slen && !memcmp(atom, s, alen);
 232}
 233
 234static void expand_atom(struct strbuf *sb, const char *atom, int len,
 235                        void *vdata)
 236{
 237        struct expand_data *data = vdata;
 238
 239        if (is_atom("objectname", atom, len)) {
 240                if (!data->mark_query)
 241                        strbuf_addstr(sb, oid_to_hex(&data->oid));
 242        } else if (is_atom("objecttype", atom, len)) {
 243                if (data->mark_query)
 244                        data->info.typep = &data->type;
 245                else
 246                        strbuf_addstr(sb, type_name(data->type));
 247        } else if (is_atom("objectsize", atom, len)) {
 248                if (data->mark_query)
 249                        data->info.sizep = &data->size;
 250                else
 251                        strbuf_addf(sb, "%"PRIuMAX , (uintmax_t)data->size);
 252        } else if (is_atom("objectsize:disk", atom, len)) {
 253                if (data->mark_query)
 254                        data->info.disk_sizep = &data->disk_size;
 255                else
 256                        strbuf_addf(sb, "%"PRIuMAX, (uintmax_t)data->disk_size);
 257        } else if (is_atom("rest", atom, len)) {
 258                if (data->mark_query)
 259                        data->split_on_whitespace = 1;
 260                else if (data->rest)
 261                        strbuf_addstr(sb, data->rest);
 262        } else if (is_atom("deltabase", atom, len)) {
 263                if (data->mark_query)
 264                        data->info.delta_base_sha1 = data->delta_base_oid.hash;
 265                else
 266                        strbuf_addstr(sb,
 267                                      oid_to_hex(&data->delta_base_oid));
 268        } else
 269                die("unknown format element: %.*s", len, atom);
 270}
 271
 272static size_t expand_format(struct strbuf *sb, const char *start, void *data)
 273{
 274        const char *end;
 275
 276        if (*start != '(')
 277                return 0;
 278        end = strchr(start + 1, ')');
 279        if (!end)
 280                die("format element '%s' does not end in ')'", start);
 281
 282        expand_atom(sb, start + 1, end - start - 1, data);
 283
 284        return end - start + 1;
 285}
 286
 287static void batch_write(struct batch_options *opt, const void *data, int len)
 288{
 289        if (opt->buffer_output) {
 290                if (fwrite(data, 1, len, stdout) != len)
 291                        die_errno("unable to write to stdout");
 292        } else
 293                write_or_die(1, data, len);
 294}
 295
 296static void print_object_or_die(struct batch_options *opt, struct expand_data *data)
 297{
 298        const struct object_id *oid = &data->oid;
 299
 300        assert(data->info.typep);
 301
 302        if (data->type == OBJ_BLOB) {
 303                if (opt->buffer_output)
 304                        fflush(stdout);
 305                if (opt->cmdmode) {
 306                        char *contents;
 307                        unsigned long size;
 308
 309                        if (!data->rest)
 310                                die("missing path for '%s'", oid_to_hex(oid));
 311
 312                        if (opt->cmdmode == 'w') {
 313                                if (filter_object(data->rest, 0100644, oid,
 314                                                  &contents, &size))
 315                                        die("could not convert '%s' %s",
 316                                            oid_to_hex(oid), data->rest);
 317                        } else if (opt->cmdmode == 'c') {
 318                                enum object_type type;
 319                                if (!textconv_object(the_repository,
 320                                                     data->rest, 0100644, oid,
 321                                                     1, &contents, &size))
 322                                        contents = read_object_file(oid,
 323                                                                    &type,
 324                                                                    &size);
 325                                if (!contents)
 326                                        die("could not convert '%s' %s",
 327                                            oid_to_hex(oid), data->rest);
 328                        } else
 329                                BUG("invalid cmdmode: %c", opt->cmdmode);
 330                        batch_write(opt, contents, size);
 331                        free(contents);
 332                } else {
 333                        stream_blob(oid);
 334                }
 335        }
 336        else {
 337                enum object_type type;
 338                unsigned long size;
 339                void *contents;
 340
 341                contents = read_object_file(oid, &type, &size);
 342                if (!contents)
 343                        die("object %s disappeared", oid_to_hex(oid));
 344                if (type != data->type)
 345                        die("object %s changed type!?", oid_to_hex(oid));
 346                if (data->info.sizep && size != data->size)
 347                        die("object %s changed size!?", oid_to_hex(oid));
 348
 349                batch_write(opt, contents, size);
 350                free(contents);
 351        }
 352}
 353
 354static void batch_object_write(const char *obj_name,
 355                               struct strbuf *scratch,
 356                               struct batch_options *opt,
 357                               struct expand_data *data)
 358{
 359        if (!data->skip_object_info &&
 360            oid_object_info_extended(the_repository, &data->oid, &data->info,
 361                                     OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 362                printf("%s missing\n",
 363                       obj_name ? obj_name : oid_to_hex(&data->oid));
 364                fflush(stdout);
 365                return;
 366        }
 367
 368        strbuf_reset(scratch);
 369        strbuf_expand(scratch, opt->format, expand_format, data);
 370        strbuf_addch(scratch, '\n');
 371        batch_write(opt, scratch->buf, scratch->len);
 372
 373        if (opt->print_contents) {
 374                print_object_or_die(opt, data);
 375                batch_write(opt, "\n", 1);
 376        }
 377}
 378
 379static void batch_one_object(const char *obj_name,
 380                             struct strbuf *scratch,
 381                             struct batch_options *opt,
 382                             struct expand_data *data)
 383{
 384        struct object_context ctx;
 385        int flags = opt->follow_symlinks ? GET_OID_FOLLOW_SYMLINKS : 0;
 386        enum get_oid_result result;
 387
 388        result = get_oid_with_context(the_repository, obj_name,
 389                                      flags, &data->oid, &ctx);
 390        if (result != FOUND) {
 391                switch (result) {
 392                case MISSING_OBJECT:
 393                        printf("%s missing\n", obj_name);
 394                        break;
 395                case SHORT_NAME_AMBIGUOUS:
 396                        printf("%s ambiguous\n", obj_name);
 397                        break;
 398                case DANGLING_SYMLINK:
 399                        printf("dangling %"PRIuMAX"\n%s\n",
 400                               (uintmax_t)strlen(obj_name), obj_name);
 401                        break;
 402                case SYMLINK_LOOP:
 403                        printf("loop %"PRIuMAX"\n%s\n",
 404                               (uintmax_t)strlen(obj_name), obj_name);
 405                        break;
 406                case NOT_DIR:
 407                        printf("notdir %"PRIuMAX"\n%s\n",
 408                               (uintmax_t)strlen(obj_name), obj_name);
 409                        break;
 410                default:
 411                        BUG("unknown get_sha1_with_context result %d\n",
 412                               result);
 413                        break;
 414                }
 415                fflush(stdout);
 416                return;
 417        }
 418
 419        if (ctx.mode == 0) {
 420                printf("symlink %"PRIuMAX"\n%s\n",
 421                       (uintmax_t)ctx.symlink_path.len,
 422                       ctx.symlink_path.buf);
 423                fflush(stdout);
 424                return;
 425        }
 426
 427        batch_object_write(obj_name, scratch, opt, data);
 428}
 429
 430struct object_cb_data {
 431        struct batch_options *opt;
 432        struct expand_data *expand;
 433        struct oidset *seen;
 434        struct strbuf *scratch;
 435};
 436
 437static int batch_object_cb(const struct object_id *oid, void *vdata)
 438{
 439        struct object_cb_data *data = vdata;
 440        oidcpy(&data->expand->oid, oid);
 441        batch_object_write(NULL, data->scratch, data->opt, data->expand);
 442        return 0;
 443}
 444
 445static int collect_loose_object(const struct object_id *oid,
 446                                const char *path,
 447                                void *data)
 448{
 449        oid_array_append(data, oid);
 450        return 0;
 451}
 452
 453static int collect_packed_object(const struct object_id *oid,
 454                                 struct packed_git *pack,
 455                                 uint32_t pos,
 456                                 void *data)
 457{
 458        oid_array_append(data, oid);
 459        return 0;
 460}
 461
 462static int batch_unordered_object(const struct object_id *oid, void *vdata)
 463{
 464        struct object_cb_data *data = vdata;
 465
 466        if (oidset_insert(data->seen, oid))
 467                return 0;
 468
 469        return batch_object_cb(oid, data);
 470}
 471
 472static int batch_unordered_loose(const struct object_id *oid,
 473                                 const char *path,
 474                                 void *data)
 475{
 476        return batch_unordered_object(oid, data);
 477}
 478
 479static int batch_unordered_packed(const struct object_id *oid,
 480                                  struct packed_git *pack,
 481                                  uint32_t pos,
 482                                  void *data)
 483{
 484        return batch_unordered_object(oid, data);
 485}
 486
 487static int batch_objects(struct batch_options *opt)
 488{
 489        struct strbuf input = STRBUF_INIT;
 490        struct strbuf output = STRBUF_INIT;
 491        struct expand_data data;
 492        int save_warning;
 493        int retval = 0;
 494
 495        if (!opt->format)
 496                opt->format = "%(objectname) %(objecttype) %(objectsize)";
 497
 498        /*
 499         * Expand once with our special mark_query flag, which will prime the
 500         * object_info to be handed to oid_object_info_extended for each
 501         * object.
 502         */
 503        memset(&data, 0, sizeof(data));
 504        data.mark_query = 1;
 505        strbuf_expand(&output, opt->format, expand_format, &data);
 506        data.mark_query = 0;
 507        strbuf_release(&output);
 508        if (opt->cmdmode)
 509                data.split_on_whitespace = 1;
 510
 511        if (opt->all_objects) {
 512                struct object_info empty = OBJECT_INFO_INIT;
 513                if (!memcmp(&data.info, &empty, sizeof(empty)))
 514                        data.skip_object_info = 1;
 515        }
 516
 517        /*
 518         * If we are printing out the object, then always fill in the type,
 519         * since we will want to decide whether or not to stream.
 520         */
 521        if (opt->print_contents)
 522                data.info.typep = &data.type;
 523
 524        if (opt->all_objects) {
 525                struct object_cb_data cb;
 526
 527                if (repository_format_partial_clone)
 528                        warning("This repository has extensions.partialClone set. Some objects may not be loaded.");
 529
 530                cb.opt = opt;
 531                cb.expand = &data;
 532                cb.scratch = &output;
 533
 534                if (opt->unordered) {
 535                        struct oidset seen = OIDSET_INIT;
 536
 537                        cb.seen = &seen;
 538
 539                        for_each_loose_object(batch_unordered_loose, &cb, 0);
 540                        for_each_packed_object(batch_unordered_packed, &cb,
 541                                               FOR_EACH_OBJECT_PACK_ORDER);
 542
 543                        oidset_clear(&seen);
 544                } else {
 545                        struct oid_array sa = OID_ARRAY_INIT;
 546
 547                        for_each_loose_object(collect_loose_object, &sa, 0);
 548                        for_each_packed_object(collect_packed_object, &sa, 0);
 549
 550                        oid_array_for_each_unique(&sa, batch_object_cb, &cb);
 551
 552                        oid_array_clear(&sa);
 553                }
 554
 555                strbuf_release(&output);
 556                return 0;
 557        }
 558
 559        /*
 560         * We are going to call get_sha1 on a potentially very large number of
 561         * objects. In most large cases, these will be actual object sha1s. The
 562         * cost to double-check that each one is not also a ref (just so we can
 563         * warn) ends up dwarfing the actual cost of the object lookups
 564         * themselves. We can work around it by just turning off the warning.
 565         */
 566        save_warning = warn_on_object_refname_ambiguity;
 567        warn_on_object_refname_ambiguity = 0;
 568
 569        while (strbuf_getline(&input, stdin) != EOF) {
 570                if (data.split_on_whitespace) {
 571                        /*
 572                         * Split at first whitespace, tying off the beginning
 573                         * of the string and saving the remainder (or NULL) in
 574                         * data.rest.
 575                         */
 576                        char *p = strpbrk(input.buf, " \t");
 577                        if (p) {
 578                                while (*p && strchr(" \t", *p))
 579                                        *p++ = '\0';
 580                        }
 581                        data.rest = p;
 582                }
 583
 584                batch_one_object(input.buf, &output, opt, &data);
 585        }
 586
 587        strbuf_release(&input);
 588        strbuf_release(&output);
 589        warn_on_object_refname_ambiguity = save_warning;
 590        return retval;
 591}
 592
 593static const char * const cat_file_usage[] = {
 594        N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"),
 595        N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"),
 596        NULL
 597};
 598
 599static int git_cat_file_config(const char *var, const char *value, void *cb)
 600{
 601        if (userdiff_config(var, value) < 0)
 602                return -1;
 603
 604        return git_default_config(var, value, cb);
 605}
 606
 607static int batch_option_callback(const struct option *opt,
 608                                 const char *arg,
 609                                 int unset)
 610{
 611        struct batch_options *bo = opt->value;
 612
 613        BUG_ON_OPT_NEG(unset);
 614
 615        if (bo->enabled) {
 616                return error(_("only one batch option may be specified"));
 617        }
 618
 619        bo->enabled = 1;
 620        bo->print_contents = !strcmp(opt->long_name, "batch");
 621        bo->format = arg;
 622
 623        return 0;
 624}
 625
 626int cmd_cat_file(int argc, const char **argv, const char *prefix)
 627{
 628        int opt = 0;
 629        const char *exp_type = NULL, *obj_name = NULL;
 630        struct batch_options batch = {0};
 631        int unknown_type = 0;
 632
 633        const struct option options[] = {
 634                OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 635                OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
 636                OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
 637                OPT_CMDMODE('e', NULL, &opt,
 638                            N_("exit with zero when there's no error"), 'e'),
 639                OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 640                OPT_CMDMODE(0, "textconv", &opt,
 641                            N_("for blob objects, run textconv on object's content"), 'c'),
 642                OPT_CMDMODE(0, "filters", &opt,
 643                            N_("for blob objects, run filters on object's content"), 'w'),
 644                OPT_STRING(0, "path", &force_path, N_("blob"),
 645                           N_("use a specific path for --textconv/--filters")),
 646                OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 647                          N_("allow -s and -t to work with broken/corrupt objects")),
 648                OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
 649                { OPTION_CALLBACK, 0, "batch", &batch, "format",
 650                        N_("show info and content of objects fed from the standard input"),
 651                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 652                        batch_option_callback },
 653                { OPTION_CALLBACK, 0, "batch-check", &batch, "format",
 654                        N_("show info about objects fed from the standard input"),
 655                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 656                        batch_option_callback },
 657                OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 658                         N_("follow in-tree symlinks (used with --batch or --batch-check)")),
 659                OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
 660                         N_("show all objects with --batch or --batch-check")),
 661                OPT_BOOL(0, "unordered", &batch.unordered,
 662                         N_("do not order --batch-all-objects output")),
 663                OPT_END()
 664        };
 665
 666        git_config(git_cat_file_config, NULL);
 667
 668        batch.buffer_output = -1;
 669        argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 670
 671        if (opt) {
 672                if (batch.enabled && (opt == 'c' || opt == 'w'))
 673                        batch.cmdmode = opt;
 674                else if (argc == 1)
 675                        obj_name = argv[0];
 676                else
 677                        usage_with_options(cat_file_usage, options);
 678        }
 679        if (!opt && !batch.enabled) {
 680                if (argc == 2) {
 681                        exp_type = argv[0];
 682                        obj_name = argv[1];
 683                } else
 684                        usage_with_options(cat_file_usage, options);
 685        }
 686        if (batch.enabled) {
 687                if (batch.cmdmode != opt || argc)
 688                        usage_with_options(cat_file_usage, options);
 689                if (batch.cmdmode && batch.all_objects)
 690                        die("--batch-all-objects cannot be combined with "
 691                            "--textconv nor with --filters");
 692        }
 693
 694        if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 695                usage_with_options(cat_file_usage, options);
 696        }
 697
 698        if (force_path && opt != 'c' && opt != 'w') {
 699                error("--path=<path> needs --textconv or --filters");
 700                usage_with_options(cat_file_usage, options);
 701        }
 702
 703        if (force_path && batch.enabled) {
 704                error("--path=<path> incompatible with --batch");
 705                usage_with_options(cat_file_usage, options);
 706        }
 707
 708        if (batch.buffer_output < 0)
 709                batch.buffer_output = batch.all_objects;
 710
 711        if (batch.enabled)
 712                return batch_objects(&batch);
 713
 714        if (unknown_type && opt != 't' && opt != 's')
 715                die("git cat-file --allow-unknown-type: use with -s or -t");
 716        return cat_one_file(opt, exp_type, obj_name, unknown_type);
 717}