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 "sha1-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                 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
  55 static 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
  62 static 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
 193 struct 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
 229 static 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
 235 static 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
 273 static 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
 288 static 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
 297 static 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
 355 static 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
 380 static 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
 431 struct object_cb_data {
 432         struct batch_options *opt;
 433         struct expand_data *expand;
 434         struct oidset *seen;
 435         struct strbuf *scratch;
 436 };
 437
 438 static 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
 446 static 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
 454 static 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
 463 static 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
 473 static 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
 480 static 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
 488 static 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
 594 static 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
 600 static 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
 608 static 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
 627 int 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 }