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 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(the_repository, obj_name,
  77                                  GET_OID_RECORD_PATH,
  78                                  &oid, &obj_context))
  79                 die("Not a valid object name %s", obj_name);
  80
  81         if (!path)
  82                 path = obj_context.path;
  83         if (obj_context.mode == S_IFINVALID)
  84                 obj_context.mode = 0100644;
  85
  86         buf = NULL;
  87         switch (opt) {
  88         case 't':
  89                 oi.type_name = &sb;
  90                 if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
  91                         die("git cat-file: could not get object info");
  92                 if (sb.len) {
  93                         printf("%s\n", sb.buf);
  94                         strbuf_release(&sb);
  95                         return 0;
  96                 }
  97                 break;
  98
  99         case 's':
 100                 oi.sizep = &size;
 101                 if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
 102                         die("git cat-file: could not get object info");
 103                 printf("%"PRIuMAX"\n", (uintmax_t)size);
 104                 return 0;
 105
 106         case 'e':
 107                 return !has_object_file(&oid);
 108
 109         case 'w':
 110                 if (!path)
 111                         die("git cat-file --filters %s: <object> must be "
 112                             "<sha1:path>", obj_name);
 113
 114                 if (filter_object(path, obj_context.mode,
 115                                   &oid, &buf, &size))
 116                         return -1;
 117                 break;
 118
 119         case 'c':
 120                 if (!path)
 121                         die("git cat-file --textconv %s: <object> must be <sha1:path>",
 122                             obj_name);
 123
 124                 if (textconv_object(the_repository, path, obj_context.mode,
 125                                     &oid, 1, &buf, &size))
 126                         break;
 127                 /* else fallthrough */
 128
 129         case 'p':
 130                 type = oid_object_info(the_repository, &oid, NULL);
 131                 if (type < 0)
 132                         die("Not a valid object name %s", obj_name);
 133
 134                 /* custom pretty-print here */
 135                 if (type == OBJ_TREE) {
 136                         const char *ls_args[3] = { NULL };
 137                         ls_args[0] =  "ls-tree";
 138                         ls_args[1] =  obj_name;
 139                         return cmd_ls_tree(2, ls_args, NULL);
 140                 }
 141
 142                 if (type == OBJ_BLOB)
 143                         return stream_blob(&oid);
 144                 buf = read_object_file(&oid, &type, &size);
 145                 if (!buf)
 146                         die("Cannot read object %s", obj_name);
 147
 148                 /* otherwise just spit out the data */
 149                 break;
 150
 151         case 0:
 152                 if (type_from_string(exp_type) == OBJ_BLOB) {
 153                         struct object_id blob_oid;
 154                         if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 155                                 char *buffer = read_object_file(&oid, &type,
 156                                                                 &size);
 157                                 const char *target;
 158                                 if (!skip_prefix(buffer, "object ", &target) ||
 159                                     get_oid_hex(target, &blob_oid))
 160                                         die("%s not a valid tag", oid_to_hex(&oid));
 161                                 free(buffer);
 162                         } else
 163                                 oidcpy(&blob_oid, &oid);
 164
 165                         if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
 166                                 return stream_blob(&blob_oid);
 167                         /*
 168                          * we attempted to dereference a tag to a blob
 169                          * and failed; there may be new dereference
 170                          * mechanisms this code is not aware of.
 171                          * fall-back to the usual case.
 172                          */
 173                 }
 174                 buf = read_object_with_reference(&oid, exp_type, &size, NULL);
 175                 break;
 176
 177         default:
 178                 die("git cat-file: unknown option: %s", exp_type);
 179         }
 180
 181         if (!buf)
 182                 die("git cat-file %s: bad file", obj_name);
 183
 184         write_or_die(1, buf, size);
 185         free(buf);
 186         free(obj_context.path);
 187         return 0;
 188 }
 189
 190 struct expand_data {
 191         struct object_id oid;
 192         enum object_type type;
 193         unsigned long size;
 194         off_t disk_size;
 195         const char *rest;
 196         struct object_id delta_base_oid;
 197
 198         /*
 199          * If mark_query is true, we do not expand anything, but rather
 200          * just mark the object_info with items we wish to query.
 201          */
 202         int mark_query;
 203
 204         /*
 205          * Whether to split the input on whitespace before feeding it to
 206          * get_sha1; this is decided during the mark_query phase based on
 207          * whether we have a %(rest) token in our format.
 208          */
 209         int split_on_whitespace;
 210
 211         /*
 212          * After a mark_query run, this object_info is set up to be
 213          * passed to sha1_object_info_extended. It will point to the data
 214          * elements above, so you can retrieve the response from there.
 215          */
 216         struct object_info info;
 217
 218         /*
 219          * This flag will be true if the requested batch format and options
 220          * don't require us to call sha1_object_info, which can then be
 221          * optimized out.
 222          */
 223         unsigned skip_object_info : 1;
 224 };
 225
 226 static int is_atom(const char *atom, const char *s, int slen)
 227 {
 228         int alen = strlen(atom);
 229         return alen == slen && !memcmp(atom, s, alen);
 230 }
 231
 232 static void expand_atom(struct strbuf *sb, const char *atom, int len,
 233                         void *vdata)
 234 {
 235         struct expand_data *data = vdata;
 236
 237         if (is_atom("objectname", atom, len)) {
 238                 if (!data->mark_query)
 239                         strbuf_addstr(sb, oid_to_hex(&data->oid));
 240         } else if (is_atom("objecttype", atom, len)) {
 241                 if (data->mark_query)
 242                         data->info.typep = &data->type;
 243                 else
 244                         strbuf_addstr(sb, type_name(data->type));
 245         } else if (is_atom("objectsize", atom, len)) {
 246                 if (data->mark_query)
 247                         data->info.sizep = &data->size;
 248                 else
 249                         strbuf_addf(sb, "%"PRIuMAX , (uintmax_t)data->size);
 250         } else if (is_atom("objectsize:disk", atom, len)) {
 251                 if (data->mark_query)
 252                         data->info.disk_sizep = &data->disk_size;
 253                 else
 254                         strbuf_addf(sb, "%"PRIuMAX, (uintmax_t)data->disk_size);
 255         } else if (is_atom("rest", atom, len)) {
 256                 if (data->mark_query)
 257                         data->split_on_whitespace = 1;
 258                 else if (data->rest)
 259                         strbuf_addstr(sb, data->rest);
 260         } else if (is_atom("deltabase", atom, len)) {
 261                 if (data->mark_query)
 262                         data->info.delta_base_sha1 = data->delta_base_oid.hash;
 263                 else
 264                         strbuf_addstr(sb,
 265                                       oid_to_hex(&data->delta_base_oid));
 266         } else
 267                 die("unknown format element: %.*s", len, atom);
 268 }
 269
 270 static size_t expand_format(struct strbuf *sb, const char *start, void *data)
 271 {
 272         const char *end;
 273
 274         if (*start != '(')
 275                 return 0;
 276         end = strchr(start + 1, ')');
 277         if (!end)
 278                 die("format element '%s' does not end in ')'", start);
 279
 280         expand_atom(sb, start + 1, end - start - 1, data);
 281
 282         return end - start + 1;
 283 }
 284
 285 static void batch_write(struct batch_options *opt, const void *data, int len)
 286 {
 287         if (opt->buffer_output) {
 288                 if (fwrite(data, 1, len, stdout) != len)
 289                         die_errno("unable to write to stdout");
 290         } else
 291                 write_or_die(1, data, len);
 292 }
 293
 294 static void print_object_or_die(struct batch_options *opt, struct expand_data *data)
 295 {
 296         const struct object_id *oid = &data->oid;
 297
 298         assert(data->info.typep);
 299
 300         if (data->type == OBJ_BLOB) {
 301                 if (opt->buffer_output)
 302                         fflush(stdout);
 303                 if (opt->cmdmode) {
 304                         char *contents;
 305                         unsigned long size;
 306
 307                         if (!data->rest)
 308                                 die("missing path for '%s'", oid_to_hex(oid));
 309
 310                         if (opt->cmdmode == 'w') {
 311                                 if (filter_object(data->rest, 0100644, oid,
 312                                                   &contents, &size))
 313                                         die("could not convert '%s' %s",
 314                                             oid_to_hex(oid), data->rest);
 315                         } else if (opt->cmdmode == 'c') {
 316                                 enum object_type type;
 317                                 if (!textconv_object(the_repository,
 318                                                      data->rest, 0100644, oid,
 319                                                      1, &contents, &size))
 320                                         contents = read_object_file(oid,
 321                                                                     &type,
 322                                                                     &size);
 323                                 if (!contents)
 324                                         die("could not convert '%s' %s",
 325                                             oid_to_hex(oid), data->rest);
 326                         } else
 327                                 BUG("invalid cmdmode: %c", opt->cmdmode);
 328                         batch_write(opt, contents, size);
 329                         free(contents);
 330                 } else {
 331                         stream_blob(oid);
 332                 }
 333         }
 334         else {
 335                 enum object_type type;
 336                 unsigned long size;
 337                 void *contents;
 338
 339                 contents = read_object_file(oid, &type, &size);
 340                 if (!contents)
 341                         die("object %s disappeared", oid_to_hex(oid));
 342                 if (type != data->type)
 343                         die("object %s changed type!?", oid_to_hex(oid));
 344                 if (data->info.sizep && size != data->size)
 345                         die("object %s changed size!?", oid_to_hex(oid));
 346
 347                 batch_write(opt, contents, size);
 348                 free(contents);
 349         }
 350 }
 351
 352 static void batch_object_write(const char *obj_name,
 353                                struct strbuf *scratch,
 354                                struct batch_options *opt,
 355                                struct expand_data *data)
 356 {
 357         if (!data->skip_object_info &&
 358             oid_object_info_extended(the_repository, &data->oid, &data->info,
 359                                      OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 360                 printf("%s missing\n",
 361                        obj_name ? obj_name : oid_to_hex(&data->oid));
 362                 fflush(stdout);
 363                 return;
 364         }
 365
 366         strbuf_reset(scratch);
 367         strbuf_expand(scratch, opt->format, expand_format, data);
 368         strbuf_addch(scratch, '\n');
 369         batch_write(opt, scratch->buf, scratch->len);
 370
 371         if (opt->print_contents) {
 372                 print_object_or_die(opt, data);
 373                 batch_write(opt, "\n", 1);
 374         }
 375 }
 376
 377 static void batch_one_object(const char *obj_name,
 378                              struct strbuf *scratch,
 379                              struct batch_options *opt,
 380                              struct expand_data *data)
 381 {
 382         struct object_context ctx;
 383         int flags = opt->follow_symlinks ? GET_OID_FOLLOW_SYMLINKS : 0;
 384         enum follow_symlinks_result result;
 385
 386         result = get_oid_with_context(the_repository, obj_name,
 387                                       flags, &data->oid, &ctx);
 388         if (result != FOUND) {
 389                 switch (result) {
 390                 case MISSING_OBJECT:
 391                         printf("%s missing\n", obj_name);
 392                         break;
 393                 case DANGLING_SYMLINK:
 394                         printf("dangling %"PRIuMAX"\n%s\n",
 395                                (uintmax_t)strlen(obj_name), obj_name);
 396                         break;
 397                 case SYMLINK_LOOP:
 398                         printf("loop %"PRIuMAX"\n%s\n",
 399                                (uintmax_t)strlen(obj_name), obj_name);
 400                         break;
 401                 case NOT_DIR:
 402                         printf("notdir %"PRIuMAX"\n%s\n",
 403                                (uintmax_t)strlen(obj_name), obj_name);
 404                         break;
 405                 default:
 406                         BUG("unknown get_sha1_with_context result %d\n",
 407                                result);
 408                         break;
 409                 }
 410                 fflush(stdout);
 411                 return;
 412         }
 413
 414         if (ctx.mode == 0) {
 415                 printf("symlink %"PRIuMAX"\n%s\n",
 416                        (uintmax_t)ctx.symlink_path.len,
 417                        ctx.symlink_path.buf);
 418                 fflush(stdout);
 419                 return;
 420         }
 421
 422         batch_object_write(obj_name, scratch, opt, data);
 423 }
 424
 425 struct object_cb_data {
 426         struct batch_options *opt;
 427         struct expand_data *expand;
 428         struct oidset *seen;
 429         struct strbuf *scratch;
 430 };
 431
 432 static int batch_object_cb(const struct object_id *oid, void *vdata)
 433 {
 434         struct object_cb_data *data = vdata;
 435         oidcpy(&data->expand->oid, oid);
 436         batch_object_write(NULL, data->scratch, data->opt, data->expand);
 437         return 0;
 438 }
 439
 440 static int collect_loose_object(const struct object_id *oid,
 441                                 const char *path,
 442                                 void *data)
 443 {
 444         oid_array_append(data, oid);
 445         return 0;
 446 }
 447
 448 static int collect_packed_object(const struct object_id *oid,
 449                                  struct packed_git *pack,
 450                                  uint32_t pos,
 451                                  void *data)
 452 {
 453         oid_array_append(data, oid);
 454         return 0;
 455 }
 456
 457 static int batch_unordered_object(const struct object_id *oid, void *vdata)
 458 {
 459         struct object_cb_data *data = vdata;
 460
 461         if (oidset_insert(data->seen, oid))
 462                 return 0;
 463
 464         return batch_object_cb(oid, data);
 465 }
 466
 467 static int batch_unordered_loose(const struct object_id *oid,
 468                                  const char *path,
 469                                  void *data)
 470 {
 471         return batch_unordered_object(oid, data);
 472 }
 473
 474 static int batch_unordered_packed(const struct object_id *oid,
 475                                   struct packed_git *pack,
 476                                   uint32_t pos,
 477                                   void *data)
 478 {
 479         return batch_unordered_object(oid, data);
 480 }
 481
 482 static int batch_objects(struct batch_options *opt)
 483 {
 484         struct strbuf input = STRBUF_INIT;
 485         struct strbuf output = STRBUF_INIT;
 486         struct expand_data data;
 487         int save_warning;
 488         int retval = 0;
 489
 490         if (!opt->format)
 491                 opt->format = "%(objectname) %(objecttype) %(objectsize)";
 492
 493         /*
 494          * Expand once with our special mark_query flag, which will prime the
 495          * object_info to be handed to sha1_object_info_extended for each
 496          * object.
 497          */
 498         memset(&data, 0, sizeof(data));
 499         data.mark_query = 1;
 500         strbuf_expand(&output, opt->format, expand_format, &data);
 501         data.mark_query = 0;
 502         strbuf_release(&output);
 503         if (opt->cmdmode)
 504                 data.split_on_whitespace = 1;
 505
 506         if (opt->all_objects) {
 507                 struct object_info empty = OBJECT_INFO_INIT;
 508                 if (!memcmp(&data.info, &empty, sizeof(empty)))
 509                         data.skip_object_info = 1;
 510         }
 511
 512         /*
 513          * If we are printing out the object, then always fill in the type,
 514          * since we will want to decide whether or not to stream.
 515          */
 516         if (opt->print_contents)
 517                 data.info.typep = &data.type;
 518
 519         if (opt->all_objects) {
 520                 struct object_cb_data cb;
 521
 522                 if (repository_format_partial_clone)
 523                         warning("This repository has extensions.partialClone set. Some objects may not be loaded.");
 524
 525                 cb.opt = opt;
 526                 cb.expand = &data;
 527                 cb.scratch = &output;
 528
 529                 if (opt->unordered) {
 530                         struct oidset seen = OIDSET_INIT;
 531
 532                         cb.seen = &seen;
 533
 534                         for_each_loose_object(batch_unordered_loose, &cb, 0);
 535                         for_each_packed_object(batch_unordered_packed, &cb,
 536                                                FOR_EACH_OBJECT_PACK_ORDER);
 537
 538                         oidset_clear(&seen);
 539                 } else {
 540                         struct oid_array sa = OID_ARRAY_INIT;
 541
 542                         for_each_loose_object(collect_loose_object, &sa, 0);
 543                         for_each_packed_object(collect_packed_object, &sa, 0);
 544
 545                         oid_array_for_each_unique(&sa, batch_object_cb, &cb);
 546
 547                         oid_array_clear(&sa);
 548                 }
 549
 550                 strbuf_release(&output);
 551                 return 0;
 552         }
 553
 554         /*
 555          * We are going to call get_sha1 on a potentially very large number of
 556          * objects. In most large cases, these will be actual object sha1s. The
 557          * cost to double-check that each one is not also a ref (just so we can
 558          * warn) ends up dwarfing the actual cost of the object lookups
 559          * themselves. We can work around it by just turning off the warning.
 560          */
 561         save_warning = warn_on_object_refname_ambiguity;
 562         warn_on_object_refname_ambiguity = 0;
 563
 564         while (strbuf_getline(&input, stdin) != EOF) {
 565                 if (data.split_on_whitespace) {
 566                         /*
 567                          * Split at first whitespace, tying off the beginning
 568                          * of the string and saving the remainder (or NULL) in
 569                          * data.rest.
 570                          */
 571                         char *p = strpbrk(input.buf, " \t");
 572                         if (p) {
 573                                 while (*p && strchr(" \t", *p))
 574                                         *p++ = '\0';
 575                         }
 576                         data.rest = p;
 577                 }
 578
 579                 batch_one_object(input.buf, &output, opt, &data);
 580         }
 581
 582         strbuf_release(&input);
 583         strbuf_release(&output);
 584         warn_on_object_refname_ambiguity = save_warning;
 585         return retval;
 586 }
 587
 588 static const char * const cat_file_usage[] = {
 589         N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"),
 590         N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"),
 591         NULL
 592 };
 593
 594 static int git_cat_file_config(const char *var, const char *value, void *cb)
 595 {
 596         if (userdiff_config(var, value) < 0)
 597                 return -1;
 598
 599         return git_default_config(var, value, cb);
 600 }
 601
 602 static int batch_option_callback(const struct option *opt,
 603                                  const char *arg,
 604                                  int unset)
 605 {
 606         struct batch_options *bo = opt->value;
 607
 608         BUG_ON_OPT_NEG(unset);
 609
 610         if (bo->enabled) {
 611                 return error(_("only one batch option may be specified"));
 612         }
 613
 614         bo->enabled = 1;
 615         bo->print_contents = !strcmp(opt->long_name, "batch");
 616         bo->format = arg;
 617
 618         return 0;
 619 }
 620
 621 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 622 {
 623         int opt = 0;
 624         const char *exp_type = NULL, *obj_name = NULL;
 625         struct batch_options batch = {0};
 626         int unknown_type = 0;
 627
 628         const struct option options[] = {
 629                 OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 630                 OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
 631                 OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
 632                 OPT_CMDMODE('e', NULL, &opt,
 633                             N_("exit with zero when there's no error"), 'e'),
 634                 OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 635                 OPT_CMDMODE(0, "textconv", &opt,
 636                             N_("for blob objects, run textconv on object's content"), 'c'),
 637                 OPT_CMDMODE(0, "filters", &opt,
 638                             N_("for blob objects, run filters on object's content"), 'w'),
 639                 OPT_STRING(0, "path", &force_path, N_("blob"),
 640                            N_("use a specific path for --textconv/--filters")),
 641                 OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 642                           N_("allow -s and -t to work with broken/corrupt objects")),
 643                 OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
 644                 { OPTION_CALLBACK, 0, "batch", &batch, "format",
 645                         N_("show info and content of objects fed from the standard input"),
 646                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 647                         batch_option_callback },
 648                 { OPTION_CALLBACK, 0, "batch-check", &batch, "format",
 649                         N_("show info about objects fed from the standard input"),
 650                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 651                         batch_option_callback },
 652                 OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 653                          N_("follow in-tree symlinks (used with --batch or --batch-check)")),
 654                 OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
 655                          N_("show all objects with --batch or --batch-check")),
 656                 OPT_BOOL(0, "unordered", &batch.unordered,
 657                          N_("do not order --batch-all-objects output")),
 658                 OPT_END()
 659         };
 660
 661         git_config(git_cat_file_config, NULL);
 662
 663         batch.buffer_output = -1;
 664         argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 665
 666         if (opt) {
 667                 if (batch.enabled && (opt == 'c' || opt == 'w'))
 668                         batch.cmdmode = opt;
 669                 else if (argc == 1)
 670                         obj_name = argv[0];
 671                 else
 672                         usage_with_options(cat_file_usage, options);
 673         }
 674         if (!opt && !batch.enabled) {
 675                 if (argc == 2) {
 676                         exp_type = argv[0];
 677                         obj_name = argv[1];
 678                 } else
 679                         usage_with_options(cat_file_usage, options);
 680         }
 681         if (batch.enabled) {
 682                 if (batch.cmdmode != opt || argc)
 683                         usage_with_options(cat_file_usage, options);
 684                 if (batch.cmdmode && batch.all_objects)
 685                         die("--batch-all-objects cannot be combined with "
 686                             "--textconv nor with --filters");
 687         }
 688
 689         if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 690                 usage_with_options(cat_file_usage, options);
 691         }
 692
 693         if (force_path && opt != 'c' && opt != 'w') {
 694                 error("--path=<path> needs --textconv or --filters");
 695                 usage_with_options(cat_file_usage, options);
 696         }
 697
 698         if (force_path && batch.enabled) {
 699                 error("--path=<path> incompatible with --batch");
 700                 usage_with_options(cat_file_usage, options);
 701         }
 702
 703         if (batch.buffer_output < 0)
 704                 batch.buffer_output = batch.all_objects;
 705
 706         if (batch.enabled)
 707                 return batch_objects(&batch);
 708
 709         if (unknown_type && opt != 't' && opt != 's')
 710                 die("git cat-file --allow-unknown-type: use with -s or -t");
 711         return cat_one_file(opt, exp_type, obj_name, unknown_type);
 712 }