builtin/cat-file.c

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