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