Andrew's git / gitweb.git / builtin/cat-file.c
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builtin / cat-file.con commit Merge branch 'rs/trace2-dst-warning' (a2e22bb)
   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#include "promisor-remote.h"
  19
  20struct batch_options {
  21        int enabled;
  22        int follow_symlinks;
  23        int print_contents;
  24        int buffer_output;
  25        int all_objects;
  26        int unordered;
  27        int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */
  28        const char *format;
  29};
  30
  31static const char *force_path;
  32
  33static int filter_object(const char *path, unsigned mode,
  34                         const struct object_id *oid,
  35                         char **buf, unsigned long *size)
  36{
  37        enum object_type type;
  38
  39        *buf = read_object_file(oid, &type, size);
  40        if (!*buf)
  41                return error(_("cannot read object %s '%s'"),
  42                             oid_to_hex(oid), path);
  43        if ((type == OBJ_BLOB) && S_ISREG(mode)) {
  44                struct strbuf strbuf = STRBUF_INIT;
  45                if (convert_to_working_tree(&the_index, path, *buf, *size, &strbuf)) {
  46                        free(*buf);
  47                        *size = strbuf.len;
  48                        *buf = strbuf_detach(&strbuf, NULL);
  49                }
  50        }
  51
  52        return 0;
  53}
  54
  55static int stream_blob(const struct object_id *oid)
  56{
  57        if (stream_blob_to_fd(1, oid, NULL, 0))
  58                die("unable to stream %s to stdout", oid_to_hex(oid));
  59        return 0;
  60}
  61
  62static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
  63                        int unknown_type)
  64{
  65        struct object_id oid;
  66        enum object_type type;
  67        char *buf;
  68        unsigned long size;
  69        struct object_context obj_context;
  70        struct object_info oi = OBJECT_INFO_INIT;
  71        struct strbuf sb = STRBUF_INIT;
  72        unsigned flags = OBJECT_INFO_LOOKUP_REPLACE;
  73        const char *path = force_path;
  74
  75        if (unknown_type)
  76                flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
  77
  78        if (get_oid_with_context(the_repository, obj_name,
  79                                 GET_OID_RECORD_PATH,
  80                                 &oid, &obj_context))
  81                die("Not a valid object name %s", obj_name);
  82
  83        if (!path)
  84                path = obj_context.path;
  85        if (obj_context.mode == S_IFINVALID)
  86                obj_context.mode = 0100644;
  87
  88        buf = NULL;
  89        switch (opt) {
  90        case 't':
  91                oi.type_name = &sb;
  92                if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
  93                        die("git cat-file: could not get object info");
  94                if (sb.len) {
  95                        printf("%s\n", sb.buf);
  96                        strbuf_release(&sb);
  97                        return 0;
  98                }
  99                break;
 100
 101        case 's':
 102                oi.sizep = &size;
 103                if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
 104                        die("git cat-file: could not get object info");
 105                printf("%"PRIuMAX"\n", (uintmax_t)size);
 106                return 0;
 107
 108        case 'e':
 109                return !has_object_file(&oid);
 110
 111        case 'w':
 112                if (!path)
 113                        die("git cat-file --filters %s: <object> must be "
 114                            "<sha1:path>", obj_name);
 115
 116                if (filter_object(path, obj_context.mode,
 117                                  &oid, &buf, &size))
 118                        return -1;
 119                break;
 120
 121        case 'c':
 122                if (!path)
 123                        die("git cat-file --textconv %s: <object> must be <sha1:path>",
 124                            obj_name);
 125
 126                if (textconv_object(the_repository, path, obj_context.mode,
 127                                    &oid, 1, &buf, &size))
 128                        break;
 129                /* else fallthrough */
 130
 131        case 'p':
 132                type = oid_object_info(the_repository, &oid, NULL);
 133                if (type < 0)
 134                        die("Not a valid object name %s", obj_name);
 135
 136                /* custom pretty-print here */
 137                if (type == OBJ_TREE) {
 138                        const char *ls_args[3] = { NULL };
 139                        ls_args[0] =  "ls-tree";
 140                        ls_args[1] =  obj_name;
 141                        return cmd_ls_tree(2, ls_args, NULL);
 142                }
 143
 144                if (type == OBJ_BLOB)
 145                        return stream_blob(&oid);
 146                buf = read_object_file(&oid, &type, &size);
 147                if (!buf)
 148                        die("Cannot read object %s", obj_name);
 149
 150                /* otherwise just spit out the data */
 151                break;
 152
 153        case 0:
 154                if (type_from_string(exp_type) == OBJ_BLOB) {
 155                        struct object_id blob_oid;
 156                        if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 157                                char *buffer = read_object_file(&oid, &type,
 158                                                                &size);
 159                                const char *target;
 160                                if (!skip_prefix(buffer, "object ", &target) ||
 161                                    get_oid_hex(target, &blob_oid))
 162                                        die("%s not a valid tag", oid_to_hex(&oid));
 163                                free(buffer);
 164                        } else
 165                                oidcpy(&blob_oid, &oid);
 166
 167                        if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
 168                                return stream_blob(&blob_oid);
 169                        /*
 170                         * we attempted to dereference a tag to a blob
 171                         * and failed; there may be new dereference
 172                         * mechanisms this code is not aware of.
 173                         * fall-back to the usual case.
 174                         */
 175                }
 176                buf = read_object_with_reference(the_repository,
 177                                                 &oid, exp_type, &size, NULL);
 178                break;
 179
 180        default:
 181                die("git cat-file: unknown option: %s", exp_type);
 182        }
 183
 184        if (!buf)
 185                die("git cat-file %s: bad file", obj_name);
 186
 187        write_or_die(1, buf, size);
 188        free(buf);
 189        free(obj_context.path);
 190        return 0;
 191}
 192
 193struct expand_data {
 194        struct object_id oid;
 195        enum object_type type;
 196        unsigned long size;
 197        off_t disk_size;
 198        const char *rest;
 199        struct object_id delta_base_oid;
 200
 201        /*
 202         * If mark_query is true, we do not expand anything, but rather
 203         * just mark the object_info with items we wish to query.
 204         */
 205        int mark_query;
 206
 207        /*
 208         * Whether to split the input on whitespace before feeding it to
 209         * get_sha1; this is decided during the mark_query phase based on
 210         * whether we have a %(rest) token in our format.
 211         */
 212        int split_on_whitespace;
 213
 214        /*
 215         * After a mark_query run, this object_info is set up to be
 216         * passed to oid_object_info_extended. It will point to the data
 217         * elements above, so you can retrieve the response from there.
 218         */
 219        struct object_info info;
 220
 221        /*
 222         * This flag will be true if the requested batch format and options
 223         * don't require us to call oid_object_info, which can then be
 224         * optimized out.
 225         */
 226        unsigned skip_object_info : 1;
 227};
 228
 229static int is_atom(const char *atom, const char *s, int slen)
 230{
 231        int alen = strlen(atom);
 232        return alen == slen && !memcmp(atom, s, alen);
 233}
 234
 235static void expand_atom(struct strbuf *sb, const char *atom, int len,
 236                        void *vdata)
 237{
 238        struct expand_data *data = vdata;
 239
 240        if (is_atom("objectname", atom, len)) {
 241                if (!data->mark_query)
 242                        strbuf_addstr(sb, oid_to_hex(&data->oid));
 243        } else if (is_atom("objecttype", atom, len)) {
 244                if (data->mark_query)
 245                        data->info.typep = &data->type;
 246                else
 247                        strbuf_addstr(sb, type_name(data->type));
 248        } else if (is_atom("objectsize", atom, len)) {
 249                if (data->mark_query)
 250                        data->info.sizep = &data->size;
 251                else
 252                        strbuf_addf(sb, "%"PRIuMAX , (uintmax_t)data->size);
 253        } else if (is_atom("objectsize:disk", atom, len)) {
 254                if (data->mark_query)
 255                        data->info.disk_sizep = &data->disk_size;
 256                else
 257                        strbuf_addf(sb, "%"PRIuMAX, (uintmax_t)data->disk_size);
 258        } else if (is_atom("rest", atom, len)) {
 259                if (data->mark_query)
 260                        data->split_on_whitespace = 1;
 261                else if (data->rest)
 262                        strbuf_addstr(sb, data->rest);
 263        } else if (is_atom("deltabase", atom, len)) {
 264                if (data->mark_query)
 265                        data->info.delta_base_sha1 = data->delta_base_oid.hash;
 266                else
 267                        strbuf_addstr(sb,
 268                                      oid_to_hex(&data->delta_base_oid));
 269        } else
 270                die("unknown format element: %.*s", len, atom);
 271}
 272
 273static size_t expand_format(struct strbuf *sb, const char *start, void *data)
 274{
 275        const char *end;
 276
 277        if (*start != '(')
 278                return 0;
 279        end = strchr(start + 1, ')');
 280        if (!end)
 281                die("format element '%s' does not end in ')'", start);
 282
 283        expand_atom(sb, start + 1, end - start - 1, data);
 284
 285        return end - start + 1;
 286}
 287
 288static void batch_write(struct batch_options *opt, const void *data, int len)
 289{
 290        if (opt->buffer_output) {
 291                if (fwrite(data, 1, len, stdout) != len)
 292                        die_errno("unable to write to stdout");
 293        } else
 294                write_or_die(1, data, len);
 295}
 296
 297static void print_object_or_die(struct batch_options *opt, struct expand_data *data)
 298{
 299        const struct object_id *oid = &data->oid;
 300
 301        assert(data->info.typep);
 302
 303        if (data->type == OBJ_BLOB) {
 304                if (opt->buffer_output)
 305                        fflush(stdout);
 306                if (opt->cmdmode) {
 307                        char *contents;
 308                        unsigned long size;
 309
 310                        if (!data->rest)
 311                                die("missing path for '%s'", oid_to_hex(oid));
 312
 313                        if (opt->cmdmode == 'w') {
 314                                if (filter_object(data->rest, 0100644, oid,
 315                                                  &contents, &size))
 316                                        die("could not convert '%s' %s",
 317                                            oid_to_hex(oid), data->rest);
 318                        } else if (opt->cmdmode == 'c') {
 319                                enum object_type type;
 320                                if (!textconv_object(the_repository,
 321                                                     data->rest, 0100644, oid,
 322                                                     1, &contents, &size))
 323                                        contents = read_object_file(oid,
 324                                                                    &type,
 325                                                                    &size);
 326                                if (!contents)
 327                                        die("could not convert '%s' %s",
 328                                            oid_to_hex(oid), data->rest);
 329                        } else
 330                                BUG("invalid cmdmode: %c", opt->cmdmode);
 331                        batch_write(opt, contents, size);
 332                        free(contents);
 333                } else {
 334                        stream_blob(oid);
 335                }
 336        }
 337        else {
 338                enum object_type type;
 339                unsigned long size;
 340                void *contents;
 341
 342                contents = read_object_file(oid, &type, &size);
 343                if (!contents)
 344                        die("object %s disappeared", oid_to_hex(oid));
 345                if (type != data->type)
 346                        die("object %s changed type!?", oid_to_hex(oid));
 347                if (data->info.sizep && size != data->size)
 348                        die("object %s changed size!?", oid_to_hex(oid));
 349
 350                batch_write(opt, contents, size);
 351                free(contents);
 352        }
 353}
 354
 355static void batch_object_write(const char *obj_name,
 356                               struct strbuf *scratch,
 357                               struct batch_options *opt,
 358                               struct expand_data *data)
 359{
 360        if (!data->skip_object_info &&
 361            oid_object_info_extended(the_repository, &data->oid, &data->info,
 362                                     OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 363                printf("%s missing\n",
 364                       obj_name ? obj_name : oid_to_hex(&data->oid));
 365                fflush(stdout);
 366                return;
 367        }
 368
 369        strbuf_reset(scratch);
 370        strbuf_expand(scratch, opt->format, expand_format, data);
 371        strbuf_addch(scratch, '\n');
 372        batch_write(opt, scratch->buf, scratch->len);
 373
 374        if (opt->print_contents) {
 375                print_object_or_die(opt, data);
 376                batch_write(opt, "\n", 1);
 377        }
 378}
 379
 380static void batch_one_object(const char *obj_name,
 381                             struct strbuf *scratch,
 382                             struct batch_options *opt,
 383                             struct expand_data *data)
 384{
 385        struct object_context ctx;
 386        int flags = opt->follow_symlinks ? GET_OID_FOLLOW_SYMLINKS : 0;
 387        enum get_oid_result result;
 388
 389        result = get_oid_with_context(the_repository, obj_name,
 390                                      flags, &data->oid, &ctx);
 391        if (result != FOUND) {
 392                switch (result) {
 393                case MISSING_OBJECT:
 394                        printf("%s missing\n", obj_name);
 395                        break;
 396                case SHORT_NAME_AMBIGUOUS:
 397                        printf("%s ambiguous\n", obj_name);
 398                        break;
 399                case DANGLING_SYMLINK:
 400                        printf("dangling %"PRIuMAX"\n%s\n",
 401                               (uintmax_t)strlen(obj_name), obj_name);
 402                        break;
 403                case SYMLINK_LOOP:
 404                        printf("loop %"PRIuMAX"\n%s\n",
 405                               (uintmax_t)strlen(obj_name), obj_name);
 406                        break;
 407                case NOT_DIR:
 408                        printf("notdir %"PRIuMAX"\n%s\n",
 409                               (uintmax_t)strlen(obj_name), obj_name);
 410                        break;
 411                default:
 412                        BUG("unknown get_sha1_with_context result %d\n",
 413                               result);
 414                        break;
 415                }
 416                fflush(stdout);
 417                return;
 418        }
 419
 420        if (ctx.mode == 0) {
 421                printf("symlink %"PRIuMAX"\n%s\n",
 422                       (uintmax_t)ctx.symlink_path.len,
 423                       ctx.symlink_path.buf);
 424                fflush(stdout);
 425                return;
 426        }
 427
 428        batch_object_write(obj_name, scratch, opt, data);
 429}
 430
 431struct object_cb_data {
 432        struct batch_options *opt;
 433        struct expand_data *expand;
 434        struct oidset *seen;
 435        struct strbuf *scratch;
 436};
 437
 438static int batch_object_cb(const struct object_id *oid, void *vdata)
 439{
 440        struct object_cb_data *data = vdata;
 441        oidcpy(&data->expand->oid, oid);
 442        batch_object_write(NULL, data->scratch, data->opt, data->expand);
 443        return 0;
 444}
 445
 446static int collect_loose_object(const struct object_id *oid,
 447                                const char *path,
 448                                void *data)
 449{
 450        oid_array_append(data, oid);
 451        return 0;
 452}
 453
 454static int collect_packed_object(const struct object_id *oid,
 455                                 struct packed_git *pack,
 456                                 uint32_t pos,
 457                                 void *data)
 458{
 459        oid_array_append(data, oid);
 460        return 0;
 461}
 462
 463static int batch_unordered_object(const struct object_id *oid, void *vdata)
 464{
 465        struct object_cb_data *data = vdata;
 466
 467        if (oidset_insert(data->seen, oid))
 468                return 0;
 469
 470        return batch_object_cb(oid, data);
 471}
 472
 473static int batch_unordered_loose(const struct object_id *oid,
 474                                 const char *path,
 475                                 void *data)
 476{
 477        return batch_unordered_object(oid, data);
 478}
 479
 480static int batch_unordered_packed(const struct object_id *oid,
 481                                  struct packed_git *pack,
 482                                  uint32_t pos,
 483                                  void *data)
 484{
 485        return batch_unordered_object(oid, data);
 486}
 487
 488static int batch_objects(struct batch_options *opt)
 489{
 490        struct strbuf input = STRBUF_INIT;
 491        struct strbuf output = STRBUF_INIT;
 492        struct expand_data data;
 493        int save_warning;
 494        int retval = 0;
 495
 496        if (!opt->format)
 497                opt->format = "%(objectname) %(objecttype) %(objectsize)";
 498
 499        /*
 500         * Expand once with our special mark_query flag, which will prime the
 501         * object_info to be handed to oid_object_info_extended for each
 502         * object.
 503         */
 504        memset(&data, 0, sizeof(data));
 505        data.mark_query = 1;
 506        strbuf_expand(&output, opt->format, expand_format, &data);
 507        data.mark_query = 0;
 508        strbuf_release(&output);
 509        if (opt->cmdmode)
 510                data.split_on_whitespace = 1;
 511
 512        if (opt->all_objects) {
 513                struct object_info empty = OBJECT_INFO_INIT;
 514                if (!memcmp(&data.info, &empty, sizeof(empty)))
 515                        data.skip_object_info = 1;
 516        }
 517
 518        /*
 519         * If we are printing out the object, then always fill in the type,
 520         * since we will want to decide whether or not to stream.
 521         */
 522        if (opt->print_contents)
 523                data.info.typep = &data.type;
 524
 525        if (opt->all_objects) {
 526                struct object_cb_data cb;
 527
 528                if (has_promisor_remote())
 529                        warning("This repository uses promisor remotes. Some objects may not be loaded.");
 530
 531                cb.opt = opt;
 532                cb.expand = &data;
 533                cb.scratch = &output;
 534
 535                if (opt->unordered) {
 536                        struct oidset seen = OIDSET_INIT;
 537
 538                        cb.seen = &seen;
 539
 540                        for_each_loose_object(batch_unordered_loose, &cb, 0);
 541                        for_each_packed_object(batch_unordered_packed, &cb,
 542                                               FOR_EACH_OBJECT_PACK_ORDER);
 543
 544                        oidset_clear(&seen);
 545                } else {
 546                        struct oid_array sa = OID_ARRAY_INIT;
 547
 548                        for_each_loose_object(collect_loose_object, &sa, 0);
 549                        for_each_packed_object(collect_packed_object, &sa, 0);
 550
 551                        oid_array_for_each_unique(&sa, batch_object_cb, &cb);
 552
 553                        oid_array_clear(&sa);
 554                }
 555
 556                strbuf_release(&output);
 557                return 0;
 558        }
 559
 560        /*
 561         * We are going to call get_sha1 on a potentially very large number of
 562         * objects. In most large cases, these will be actual object sha1s. The
 563         * cost to double-check that each one is not also a ref (just so we can
 564         * warn) ends up dwarfing the actual cost of the object lookups
 565         * themselves. We can work around it by just turning off the warning.
 566         */
 567        save_warning = warn_on_object_refname_ambiguity;
 568        warn_on_object_refname_ambiguity = 0;
 569
 570        while (strbuf_getline(&input, stdin) != EOF) {
 571                if (data.split_on_whitespace) {
 572                        /*
 573                         * Split at first whitespace, tying off the beginning
 574                         * of the string and saving the remainder (or NULL) in
 575                         * data.rest.
 576                         */
 577                        char *p = strpbrk(input.buf, " \t");
 578                        if (p) {
 579                                while (*p && strchr(" \t", *p))
 580                                        *p++ = '\0';
 581                        }
 582                        data.rest = p;
 583                }
 584
 585                batch_one_object(input.buf, &output, opt, &data);
 586        }
 587
 588        strbuf_release(&input);
 589        strbuf_release(&output);
 590        warn_on_object_refname_ambiguity = save_warning;
 591        return retval;
 592}
 593
 594static const char * const cat_file_usage[] = {
 595        N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"),
 596        N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"),
 597        NULL
 598};
 599
 600static int git_cat_file_config(const char *var, const char *value, void *cb)
 601{
 602        if (userdiff_config(var, value) < 0)
 603                return -1;
 604
 605        return git_default_config(var, value, cb);
 606}
 607
 608static int batch_option_callback(const struct option *opt,
 609                                 const char *arg,
 610                                 int unset)
 611{
 612        struct batch_options *bo = opt->value;
 613
 614        BUG_ON_OPT_NEG(unset);
 615
 616        if (bo->enabled) {
 617                return error(_("only one batch option may be specified"));
 618        }
 619
 620        bo->enabled = 1;
 621        bo->print_contents = !strcmp(opt->long_name, "batch");
 622        bo->format = arg;
 623
 624        return 0;
 625}
 626
 627int cmd_cat_file(int argc, const char **argv, const char *prefix)
 628{
 629        int opt = 0;
 630        const char *exp_type = NULL, *obj_name = NULL;
 631        struct batch_options batch = {0};
 632        int unknown_type = 0;
 633
 634        const struct option options[] = {
 635                OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 636                OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
 637                OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
 638                OPT_CMDMODE('e', NULL, &opt,
 639                            N_("exit with zero when there's no error"), 'e'),
 640                OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 641                OPT_CMDMODE(0, "textconv", &opt,
 642                            N_("for blob objects, run textconv on object's content"), 'c'),
 643                OPT_CMDMODE(0, "filters", &opt,
 644                            N_("for blob objects, run filters on object's content"), 'w'),
 645                OPT_STRING(0, "path", &force_path, N_("blob"),
 646                           N_("use a specific path for --textconv/--filters")),
 647                OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 648                          N_("allow -s and -t to work with broken/corrupt objects")),
 649                OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
 650                { OPTION_CALLBACK, 0, "batch", &batch, "format",
 651                        N_("show info and content of objects fed from the standard input"),
 652                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 653                        batch_option_callback },
 654                { OPTION_CALLBACK, 0, "batch-check", &batch, "format",
 655                        N_("show info about objects fed from the standard input"),
 656                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 657                        batch_option_callback },
 658                OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 659                         N_("follow in-tree symlinks (used with --batch or --batch-check)")),
 660                OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
 661                         N_("show all objects with --batch or --batch-check")),
 662                OPT_BOOL(0, "unordered", &batch.unordered,
 663                         N_("do not order --batch-all-objects output")),
 664                OPT_END()
 665        };
 666
 667        git_config(git_cat_file_config, NULL);
 668
 669        batch.buffer_output = -1;
 670        argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 671
 672        if (opt) {
 673                if (batch.enabled && (opt == 'c' || opt == 'w'))
 674                        batch.cmdmode = opt;
 675                else if (argc == 1)
 676                        obj_name = argv[0];
 677                else
 678                        usage_with_options(cat_file_usage, options);
 679        }
 680        if (!opt && !batch.enabled) {
 681                if (argc == 2) {
 682                        exp_type = argv[0];
 683                        obj_name = argv[1];
 684                } else
 685                        usage_with_options(cat_file_usage, options);
 686        }
 687        if (batch.enabled) {
 688                if (batch.cmdmode != opt || argc)
 689                        usage_with_options(cat_file_usage, options);
 690                if (batch.cmdmode && batch.all_objects)
 691                        die("--batch-all-objects cannot be combined with "
 692                            "--textconv nor with --filters");
 693        }
 694
 695        if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 696                usage_with_options(cat_file_usage, options);
 697        }
 698
 699        if (force_path && opt != 'c' && opt != 'w') {
 700                error("--path=<path> needs --textconv or --filters");
 701                usage_with_options(cat_file_usage, options);
 702        }
 703
 704        if (force_path && batch.enabled) {
 705                error("--path=<path> incompatible with --batch");
 706                usage_with_options(cat_file_usage, options);
 707        }
 708
 709        if (batch.buffer_output < 0)
 710                batch.buffer_output = batch.all_objects;
 711
 712        if (batch.enabled)
 713                return batch_objects(&batch);
 714
 715        if (unknown_type && opt != 't' && opt != 's')
 716                die("git cat-file --allow-unknown-type: use with -s or -t");
 717        return cat_one_file(opt, exp_type, obj_name, unknown_type);
 718}