builtin/cat-file.c

   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 "oid-array.h"
  16 #include "packfile.h"
  17 #include "object-store.h"
  18 #include "promisor-remote.h"
  19
  20 struct 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
  31 static const char *force_path;
  32
  33 static 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                 struct checkout_metadata meta;
  46
  47                 init_checkout_metadata(&meta, NULL, NULL, oid);
  48                 if (convert_to_working_tree(&the_index, path, *buf, *size, &strbuf, &meta)) {
  49                         free(*buf);
  50                         *size = strbuf.len;
  51                         *buf = strbuf_detach(&strbuf, NULL);
  52                 }
  53         }
  54
  55         return 0;
  56 }
  57
  58 static int stream_blob(const struct object_id *oid)
  59 {
  60         if (stream_blob_to_fd(1, oid, NULL, 0))
  61                 die("unable to stream %s to stdout", oid_to_hex(oid));
  62         return 0;
  63 }
  64
  65 static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
  66                         int unknown_type)
  67 {
  68         struct object_id oid;
  69         enum object_type type;
  70         char *buf;
  71         unsigned long size;
  72         struct object_context obj_context;
  73         struct object_info oi = OBJECT_INFO_INIT;
  74         struct strbuf sb = STRBUF_INIT;
  75         unsigned flags = OBJECT_INFO_LOOKUP_REPLACE;
  76         const char *path = force_path;
  77
  78         if (unknown_type)
  79                 flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
  80
  81         if (get_oid_with_context(the_repository, obj_name,
  82                                  GET_OID_RECORD_PATH,
  83                                  &oid, &obj_context))
  84                 die("Not a valid object name %s", obj_name);
  85
  86         if (!path)
  87                 path = obj_context.path;
  88         if (obj_context.mode == S_IFINVALID)
  89                 obj_context.mode = 0100644;
  90
  91         buf = NULL;
  92         switch (opt) {
  93         case 't':
  94                 oi.type_name = &sb;
  95                 if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
  96                         die("git cat-file: could not get object info");
  97                 if (sb.len) {
  98                         printf("%s\n", sb.buf);
  99                         strbuf_release(&sb);
 100                         return 0;
 101                 }
 102                 break;
 103
 104         case 's':
 105                 oi.sizep = &size;
 106                 if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
 107                         die("git cat-file: could not get object info");
 108                 printf("%"PRIuMAX"\n", (uintmax_t)size);
 109                 return 0;
 110
 111         case 'e':
 112                 return !has_object_file(&oid);
 113
 114         case 'w':
 115                 if (!path)
 116                         die("git cat-file --filters %s: <object> must be "
 117                             "<sha1:path>", obj_name);
 118
 119                 if (filter_object(path, obj_context.mode,
 120                                   &oid, &buf, &size))
 121                         return -1;
 122                 break;
 123
 124         case 'c':
 125                 if (!path)
 126                         die("git cat-file --textconv %s: <object> must be <sha1:path>",
 127                             obj_name);
 128
 129                 if (textconv_object(the_repository, path, obj_context.mode,
 130                                     &oid, 1, &buf, &size))
 131                         break;
 132                 /* else fallthrough */
 133
 134         case 'p':
 135                 type = oid_object_info(the_repository, &oid, NULL);
 136                 if (type < 0)
 137                         die("Not a valid object name %s", obj_name);
 138
 139                 /* custom pretty-print here */
 140                 if (type == OBJ_TREE) {
 141                         const char *ls_args[3] = { NULL };
 142                         ls_args[0] =  "ls-tree";
 143                         ls_args[1] =  obj_name;
 144                         return cmd_ls_tree(2, ls_args, NULL);
 145                 }
 146
 147                 if (type == OBJ_BLOB)
 148                         return stream_blob(&oid);
 149                 buf = read_object_file(&oid, &type, &size);
 150                 if (!buf)
 151                         die("Cannot read object %s", obj_name);
 152
 153                 /* otherwise just spit out the data */
 154                 break;
 155
 156         case 0:
 157                 if (type_from_string(exp_type) == OBJ_BLOB) {
 158                         struct object_id blob_oid;
 159                         if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 160                                 char *buffer = read_object_file(&oid, &type,
 161                                                                 &size);
 162                                 const char *target;
 163                                 if (!skip_prefix(buffer, "object ", &target) ||
 164                                     get_oid_hex(target, &blob_oid))
 165                                         die("%s not a valid tag", oid_to_hex(&oid));
 166                                 free(buffer);
 167                         } else
 168                                 oidcpy(&blob_oid, &oid);
 169
 170                         if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
 171                                 return stream_blob(&blob_oid);
 172                         /*
 173                          * we attempted to dereference a tag to a blob
 174                          * and failed; there may be new dereference
 175                          * mechanisms this code is not aware of.
 176                          * fall-back to the usual case.
 177                          */
 178                 }
 179                 buf = read_object_with_reference(the_repository,
 180                                                  &oid, exp_type, &size, NULL);
 181                 break;
 182
 183         default:
 184                 die("git cat-file: unknown option: %s", exp_type);
 185         }
 186
 187         if (!buf)
 188                 die("git cat-file %s: bad file", obj_name);
 189
 190         write_or_die(1, buf, size);
 191         free(buf);
 192         free(obj_context.path);
 193         return 0;
 194 }
 195
 196 struct expand_data {
 197         struct object_id oid;
 198         enum object_type type;
 199         unsigned long size;
 200         off_t disk_size;
 201         const char *rest;
 202         struct object_id delta_base_oid;
 203
 204         /*
 205          * If mark_query is true, we do not expand anything, but rather
 206          * just mark the object_info with items we wish to query.
 207          */
 208         int mark_query;
 209
 210         /*
 211          * Whether to split the input on whitespace before feeding it to
 212          * get_sha1; this is decided during the mark_query phase based on
 213          * whether we have a %(rest) token in our format.
 214          */
 215         int split_on_whitespace;
 216
 217         /*
 218          * After a mark_query run, this object_info is set up to be
 219          * passed to oid_object_info_extended. It will point to the data
 220          * elements above, so you can retrieve the response from there.
 221          */
 222         struct object_info info;
 223
 224         /*
 225          * This flag will be true if the requested batch format and options
 226          * don't require us to call oid_object_info, which can then be
 227          * optimized out.
 228          */
 229         unsigned skip_object_info : 1;
 230 };
 231
 232 static int is_atom(const char *atom, const char *s, int slen)
 233 {
 234         int alen = strlen(atom);
 235         return alen == slen && !memcmp(atom, s, alen);
 236 }
 237
 238 static void expand_atom(struct strbuf *sb, const char *atom, int len,
 239                         void *vdata)
 240 {
 241         struct expand_data *data = vdata;
 242
 243         if (is_atom("objectname", atom, len)) {
 244                 if (!data->mark_query)
 245                         strbuf_addstr(sb, oid_to_hex(&data->oid));
 246         } else if (is_atom("objecttype", atom, len)) {
 247                 if (data->mark_query)
 248                         data->info.typep = &data->type;
 249                 else
 250                         strbuf_addstr(sb, type_name(data->type));
 251         } else if (is_atom("objectsize", atom, len)) {
 252                 if (data->mark_query)
 253                         data->info.sizep = &data->size;
 254                 else
 255                         strbuf_addf(sb, "%"PRIuMAX , (uintmax_t)data->size);
 256         } else if (is_atom("objectsize:disk", atom, len)) {
 257                 if (data->mark_query)
 258                         data->info.disk_sizep = &data->disk_size;
 259                 else
 260                         strbuf_addf(sb, "%"PRIuMAX, (uintmax_t)data->disk_size);
 261         } else if (is_atom("rest", atom, len)) {
 262                 if (data->mark_query)
 263                         data->split_on_whitespace = 1;
 264                 else if (data->rest)
 265                         strbuf_addstr(sb, data->rest);
 266         } else if (is_atom("deltabase", atom, len)) {
 267                 if (data->mark_query)
 268                         data->info.delta_base_oid = &data->delta_base_oid;
 269                 else
 270                         strbuf_addstr(sb,
 271                                       oid_to_hex(&data->delta_base_oid));
 272         } else
 273                 die("unknown format element: %.*s", len, atom);
 274 }
 275
 276 static size_t expand_format(struct strbuf *sb, const char *start, void *data)
 277 {
 278         const char *end;
 279
 280         if (*start != '(')
 281                 return 0;
 282         end = strchr(start + 1, ')');
 283         if (!end)
 284                 die("format element '%s' does not end in ')'", start);
 285
 286         expand_atom(sb, start + 1, end - start - 1, data);
 287
 288         return end - start + 1;
 289 }
 290
 291 static void batch_write(struct batch_options *opt, const void *data, int len)
 292 {
 293         if (opt->buffer_output) {
 294                 if (fwrite(data, 1, len, stdout) != len)
 295                         die_errno("unable to write to stdout");
 296         } else
 297                 write_or_die(1, data, len);
 298 }
 299
 300 static void print_object_or_die(struct batch_options *opt, struct expand_data *data)
 301 {
 302         const struct object_id *oid = &data->oid;
 303
 304         assert(data->info.typep);
 305
 306         if (data->type == OBJ_BLOB) {
 307                 if (opt->buffer_output)
 308                         fflush(stdout);
 309                 if (opt->cmdmode) {
 310                         char *contents;
 311                         unsigned long size;
 312
 313                         if (!data->rest)
 314                                 die("missing path for '%s'", oid_to_hex(oid));
 315
 316                         if (opt->cmdmode == 'w') {
 317                                 if (filter_object(data->rest, 0100644, oid,
 318                                                   &contents, &size))
 319                                         die("could not convert '%s' %s",
 320                                             oid_to_hex(oid), data->rest);
 321                         } else if (opt->cmdmode == 'c') {
 322                                 enum object_type type;
 323                                 if (!textconv_object(the_repository,
 324                                                      data->rest, 0100644, oid,
 325                                                      1, &contents, &size))
 326                                         contents = read_object_file(oid,
 327                                                                     &type,
 328                                                                     &size);
 329                                 if (!contents)
 330                                         die("could not convert '%s' %s",
 331                                             oid_to_hex(oid), data->rest);
 332                         } else
 333                                 BUG("invalid cmdmode: %c", opt->cmdmode);
 334                         batch_write(opt, contents, size);
 335                         free(contents);
 336                 } else {
 337                         stream_blob(oid);
 338                 }
 339         }
 340         else {
 341                 enum object_type type;
 342                 unsigned long size;
 343                 void *contents;
 344
 345                 contents = read_object_file(oid, &type, &size);
 346                 if (!contents)
 347                         die("object %s disappeared", oid_to_hex(oid));
 348                 if (type != data->type)
 349                         die("object %s changed type!?", oid_to_hex(oid));
 350                 if (data->info.sizep && size != data->size)
 351                         die("object %s changed size!?", oid_to_hex(oid));
 352
 353                 batch_write(opt, contents, size);
 354                 free(contents);
 355         }
 356 }
 357
 358 static void batch_object_write(const char *obj_name,
 359                                struct strbuf *scratch,
 360                                struct batch_options *opt,
 361                                struct expand_data *data)
 362 {
 363         if (!data->skip_object_info &&
 364             oid_object_info_extended(the_repository, &data->oid, &data->info,
 365                                      OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 366                 printf("%s missing\n",
 367                        obj_name ? obj_name : oid_to_hex(&data->oid));
 368                 fflush(stdout);
 369                 return;
 370         }
 371
 372         strbuf_reset(scratch);
 373         strbuf_expand(scratch, opt->format, expand_format, data);
 374         strbuf_addch(scratch, '\n');
 375         batch_write(opt, scratch->buf, scratch->len);
 376
 377         if (opt->print_contents) {
 378                 print_object_or_die(opt, data);
 379                 batch_write(opt, "\n", 1);
 380         }
 381 }
 382
 383 static void batch_one_object(const char *obj_name,
 384                              struct strbuf *scratch,
 385                              struct batch_options *opt,
 386                              struct expand_data *data)
 387 {
 388         struct object_context ctx;
 389         int flags = opt->follow_symlinks ? GET_OID_FOLLOW_SYMLINKS : 0;
 390         enum get_oid_result result;
 391
 392         result = get_oid_with_context(the_repository, obj_name,
 393                                       flags, &data->oid, &ctx);
 394         if (result != FOUND) {
 395                 switch (result) {
 396                 case MISSING_OBJECT:
 397                         printf("%s missing\n", obj_name);
 398                         break;
 399                 case SHORT_NAME_AMBIGUOUS:
 400                         printf("%s ambiguous\n", obj_name);
 401                         break;
 402                 case DANGLING_SYMLINK:
 403                         printf("dangling %"PRIuMAX"\n%s\n",
 404                                (uintmax_t)strlen(obj_name), obj_name);
 405                         break;
 406                 case SYMLINK_LOOP:
 407                         printf("loop %"PRIuMAX"\n%s\n",
 408                                (uintmax_t)strlen(obj_name), obj_name);
 409                         break;
 410                 case NOT_DIR:
 411                         printf("notdir %"PRIuMAX"\n%s\n",
 412                                (uintmax_t)strlen(obj_name), obj_name);
 413                         break;
 414                 default:
 415                         BUG("unknown get_sha1_with_context result %d\n",
 416                                result);
 417                         break;
 418                 }
 419                 fflush(stdout);
 420                 return;
 421         }
 422
 423         if (ctx.mode == 0) {
 424                 printf("symlink %"PRIuMAX"\n%s\n",
 425                        (uintmax_t)ctx.symlink_path.len,
 426                        ctx.symlink_path.buf);
 427                 fflush(stdout);
 428                 return;
 429         }
 430
 431         batch_object_write(obj_name, scratch, opt, data);
 432 }
 433
 434 struct object_cb_data {
 435         struct batch_options *opt;
 436         struct expand_data *expand;
 437         struct oidset *seen;
 438         struct strbuf *scratch;
 439 };
 440
 441 static int batch_object_cb(const struct object_id *oid, void *vdata)
 442 {
 443         struct object_cb_data *data = vdata;
 444         oidcpy(&data->expand->oid, oid);
 445         batch_object_write(NULL, data->scratch, data->opt, data->expand);
 446         return 0;
 447 }
 448
 449 static int collect_loose_object(const struct object_id *oid,
 450                                 const char *path,
 451                                 void *data)
 452 {
 453         oid_array_append(data, oid);
 454         return 0;
 455 }
 456
 457 static int collect_packed_object(const struct object_id *oid,
 458                                  struct packed_git *pack,
 459                                  uint32_t pos,
 460                                  void *data)
 461 {
 462         oid_array_append(data, oid);
 463         return 0;
 464 }
 465
 466 static int batch_unordered_object(const struct object_id *oid, void *vdata)
 467 {
 468         struct object_cb_data *data = vdata;
 469
 470         if (oidset_insert(data->seen, oid))
 471                 return 0;
 472
 473         return batch_object_cb(oid, data);
 474 }
 475
 476 static int batch_unordered_loose(const struct object_id *oid,
 477                                  const char *path,
 478                                  void *data)
 479 {
 480         return batch_unordered_object(oid, data);
 481 }
 482
 483 static int batch_unordered_packed(const struct object_id *oid,
 484                                   struct packed_git *pack,
 485                                   uint32_t pos,
 486                                   void *data)
 487 {
 488         return batch_unordered_object(oid, data);
 489 }
 490
 491 static int batch_objects(struct batch_options *opt)
 492 {
 493         struct strbuf input = STRBUF_INIT;
 494         struct strbuf output = STRBUF_INIT;
 495         struct expand_data data;
 496         int save_warning;
 497         int retval = 0;
 498
 499         if (!opt->format)
 500                 opt->format = "%(objectname) %(objecttype) %(objectsize)";
 501
 502         /*
 503          * Expand once with our special mark_query flag, which will prime the
 504          * object_info to be handed to oid_object_info_extended for each
 505          * object.
 506          */
 507         memset(&data, 0, sizeof(data));
 508         data.mark_query = 1;
 509         strbuf_expand(&output, opt->format, expand_format, &data);
 510         data.mark_query = 0;
 511         strbuf_release(&output);
 512         if (opt->cmdmode)
 513                 data.split_on_whitespace = 1;
 514
 515         if (opt->all_objects) {
 516                 struct object_info empty = OBJECT_INFO_INIT;
 517                 if (!memcmp(&data.info, &empty, sizeof(empty)))
 518                         data.skip_object_info = 1;
 519         }
 520
 521         /*
 522          * If we are printing out the object, then always fill in the type,
 523          * since we will want to decide whether or not to stream.
 524          */
 525         if (opt->print_contents)
 526                 data.info.typep = &data.type;
 527
 528         if (opt->all_objects) {
 529                 struct object_cb_data cb;
 530
 531                 if (has_promisor_remote())
 532                         warning("This repository uses promisor remotes. Some objects may not be loaded.");
 533
 534                 cb.opt = opt;
 535                 cb.expand = &data;
 536                 cb.scratch = &output;
 537
 538                 if (opt->unordered) {
 539                         struct oidset seen = OIDSET_INIT;
 540
 541                         cb.seen = &seen;
 542
 543                         for_each_loose_object(batch_unordered_loose, &cb, 0);
 544                         for_each_packed_object(batch_unordered_packed, &cb,
 545                                                FOR_EACH_OBJECT_PACK_ORDER);
 546
 547                         oidset_clear(&seen);
 548                 } else {
 549                         struct oid_array sa = OID_ARRAY_INIT;
 550
 551                         for_each_loose_object(collect_loose_object, &sa, 0);
 552                         for_each_packed_object(collect_packed_object, &sa, 0);
 553
 554                         oid_array_for_each_unique(&sa, batch_object_cb, &cb);
 555
 556                         oid_array_clear(&sa);
 557                 }
 558
 559                 strbuf_release(&output);
 560                 return 0;
 561         }
 562
 563         /*
 564          * We are going to call get_sha1 on a potentially very large number of
 565          * objects. In most large cases, these will be actual object sha1s. The
 566          * cost to double-check that each one is not also a ref (just so we can
 567          * warn) ends up dwarfing the actual cost of the object lookups
 568          * themselves. We can work around it by just turning off the warning.
 569          */
 570         save_warning = warn_on_object_refname_ambiguity;
 571         warn_on_object_refname_ambiguity = 0;
 572
 573         while (strbuf_getline(&input, stdin) != EOF) {
 574                 if (data.split_on_whitespace) {
 575                         /*
 576                          * Split at first whitespace, tying off the beginning
 577                          * of the string and saving the remainder (or NULL) in
 578                          * data.rest.
 579                          */
 580                         char *p = strpbrk(input.buf, " \t");
 581                         if (p) {
 582                                 while (*p && strchr(" \t", *p))
 583                                         *p++ = '\0';
 584                         }
 585                         data.rest = p;
 586                 }
 587
 588                 batch_one_object(input.buf, &output, opt, &data);
 589         }
 590
 591         strbuf_release(&input);
 592         strbuf_release(&output);
 593         warn_on_object_refname_ambiguity = save_warning;
 594         return retval;
 595 }
 596
 597 static const char * const cat_file_usage[] = {
 598         N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"),
 599         N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"),
 600         NULL
 601 };
 602
 603 static int git_cat_file_config(const char *var, const char *value, void *cb)
 604 {
 605         if (userdiff_config(var, value) < 0)
 606                 return -1;
 607
 608         return git_default_config(var, value, cb);
 609 }
 610
 611 static int batch_option_callback(const struct option *opt,
 612                                  const char *arg,
 613                                  int unset)
 614 {
 615         struct batch_options *bo = opt->value;
 616
 617         BUG_ON_OPT_NEG(unset);
 618
 619         if (bo->enabled) {
 620                 return error(_("only one batch option may be specified"));
 621         }
 622
 623         bo->enabled = 1;
 624         bo->print_contents = !strcmp(opt->long_name, "batch");
 625         bo->format = arg;
 626
 627         return 0;
 628 }
 629
 630 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 631 {
 632         int opt = 0;
 633         const char *exp_type = NULL, *obj_name = NULL;
 634         struct batch_options batch = {0};
 635         int unknown_type = 0;
 636
 637         const struct option options[] = {
 638                 OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 639                 OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
 640                 OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
 641                 OPT_CMDMODE('e', NULL, &opt,
 642                             N_("exit with zero when there's no error"), 'e'),
 643                 OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 644                 OPT_CMDMODE(0, "textconv", &opt,
 645                             N_("for blob objects, run textconv on object's content"), 'c'),
 646                 OPT_CMDMODE(0, "filters", &opt,
 647                             N_("for blob objects, run filters on object's content"), 'w'),
 648                 OPT_STRING(0, "path", &force_path, N_("blob"),
 649                            N_("use a specific path for --textconv/--filters")),
 650                 OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 651                           N_("allow -s and -t to work with broken/corrupt objects")),
 652                 OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
 653                 OPT_CALLBACK_F(0, "batch", &batch, "format",
 654                         N_("show info and content of objects fed from the standard input"),
 655                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 656                         batch_option_callback),
 657                 OPT_CALLBACK_F(0, "batch-check", &batch, "format",
 658                         N_("show info about objects fed from the standard input"),
 659                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 660                         batch_option_callback),
 661                 OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 662                          N_("follow in-tree symlinks (used with --batch or --batch-check)")),
 663                 OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
 664                          N_("show all objects with --batch or --batch-check")),
 665                 OPT_BOOL(0, "unordered", &batch.unordered,
 666                          N_("do not order --batch-all-objects output")),
 667                 OPT_END()
 668         };
 669
 670         git_config(git_cat_file_config, NULL);
 671
 672         batch.buffer_output = -1;
 673         argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 674
 675         if (opt) {
 676                 if (batch.enabled && (opt == 'c' || opt == 'w'))
 677                         batch.cmdmode = opt;
 678                 else if (argc == 1)
 679                         obj_name = argv[0];
 680                 else
 681                         usage_with_options(cat_file_usage, options);
 682         }
 683         if (!opt && !batch.enabled) {
 684                 if (argc == 2) {
 685                         exp_type = argv[0];
 686                         obj_name = argv[1];
 687                 } else
 688                         usage_with_options(cat_file_usage, options);
 689         }
 690         if (batch.enabled) {
 691                 if (batch.cmdmode != opt || argc)
 692                         usage_with_options(cat_file_usage, options);
 693                 if (batch.cmdmode && batch.all_objects)
 694                         die("--batch-all-objects cannot be combined with "
 695                             "--textconv nor with --filters");
 696         }
 697
 698         if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 699                 usage_with_options(cat_file_usage, options);
 700         }
 701
 702         if (force_path && opt != 'c' && opt != 'w') {
 703                 error("--path=<path> needs --textconv or --filters");
 704                 usage_with_options(cat_file_usage, options);
 705         }
 706
 707         if (force_path && batch.enabled) {
 708                 error("--path=<path> incompatible with --batch");
 709                 usage_with_options(cat_file_usage, options);
 710         }
 711
 712         if (batch.buffer_output < 0)
 713                 batch.buffer_output = batch.all_objects;
 714
 715         if (batch.enabled)
 716                 return batch_objects(&batch);
 717
 718         if (unknown_type && opt != 't' && opt != 's')
 719                 die("git cat-file --allow-unknown-type: use with -s or -t");
 720         return cat_one_file(opt, exp_type, obj_name, unknown_type);
 721 }