builtin/cat-file.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "config.h"
   8 #include "builtin.h"
   9 #include "diff.h"
  10 #include "parse-options.h"
  11 #include "userdiff.h"
  12 #include "streaming.h"
  13 #include "tree-walk.h"
  14 #include "sha1-array.h"
  15 #include "packfile.h"
  16 #include "object-store.h"
  17
  18 struct batch_options {
  19         int enabled;
  20         int follow_symlinks;
  21         int print_contents;
  22         int buffer_output;
  23         int all_objects;
  24         int unordered;
  25         int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */
  26         const char *format;
  27 };
  28
  29 static const char *force_path;
  30
  31 static int filter_object(const char *path, unsigned mode,
  32                          const struct object_id *oid,
  33                          char **buf, unsigned long *size)
  34 {
  35         enum object_type type;
  36
  37         *buf = read_object_file(oid, &type, size);
  38         if (!*buf)
  39                 return error(_("cannot read object %s '%s'"),
  40                              oid_to_hex(oid), path);
  41         if ((type == OBJ_BLOB) && S_ISREG(mode)) {
  42                 struct strbuf strbuf = STRBUF_INIT;
  43                 if (convert_to_working_tree(&the_index, path, *buf, *size, &strbuf)) {
  44                         free(*buf);
  45                         *size = strbuf.len;
  46                         *buf = strbuf_detach(&strbuf, NULL);
  47                 }
  48         }
  49
  50         return 0;
  51 }
  52
  53 static int stream_blob(const struct object_id *oid)
  54 {
  55         if (stream_blob_to_fd(1, oid, NULL, 0))
  56                 die("unable to stream %s to stdout", oid_to_hex(oid));
  57         return 0;
  58 }
  59
  60 static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
  61                         int unknown_type)
  62 {
  63         struct object_id oid;
  64         enum object_type type;
  65         char *buf;
  66         unsigned long size;
  67         struct object_context obj_context;
  68         struct object_info oi = OBJECT_INFO_INIT;
  69         struct strbuf sb = STRBUF_INIT;
  70         unsigned flags = OBJECT_INFO_LOOKUP_REPLACE;
  71         const char *path = force_path;
  72
  73         if (unknown_type)
  74                 flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
  75
  76         if (get_oid_with_context(obj_name, GET_OID_RECORD_PATH,
  77                                  &oid, &obj_context))
  78                 die("Not a valid object name %s", obj_name);
  79
  80         if (!path)
  81                 path = obj_context.path;
  82         if (obj_context.mode == S_IFINVALID)
  83                 obj_context.mode = 0100644;
  84
  85         buf = NULL;
  86         switch (opt) {
  87         case 't':
  88                 oi.type_name = &sb;
  89                 if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
  90                         die("git cat-file: could not get object info");
  91                 if (sb.len) {
  92                         printf("%s\n", sb.buf);
  93                         strbuf_release(&sb);
  94                         return 0;
  95                 }
  96                 break;
  97
  98         case 's':
  99                 oi.sizep = &size;
 100                 if (oid_object_info_extended(the_repository, &oid, &oi, flags) < 0)
 101                         die("git cat-file: could not get object info");
 102                 printf("%"PRIuMAX"\n", (uintmax_t)size);
 103                 return 0;
 104
 105         case 'e':
 106                 return !has_object_file(&oid);
 107
 108         case 'w':
 109                 if (!path)
 110                         die("git cat-file --filters %s: <object> must be "
 111                             "<sha1:path>", obj_name);
 112
 113                 if (filter_object(path, obj_context.mode,
 114                                   &oid, &buf, &size))
 115                         return -1;
 116                 break;
 117
 118         case 'c':
 119                 if (!path)
 120                         die("git cat-file --textconv %s: <object> must be <sha1:path>",
 121                             obj_name);
 122
 123                 if (textconv_object(the_repository, path, obj_context.mode,
 124                                     &oid, 1, &buf, &size))
 125                         break;
 126                 /* else fallthrough */
 127
 128         case 'p':
 129                 type = oid_object_info(the_repository, &oid, NULL);
 130                 if (type < 0)
 131                         die("Not a valid object name %s", obj_name);
 132
 133                 /* custom pretty-print here */
 134                 if (type == OBJ_TREE) {
 135                         const char *ls_args[3] = { NULL };
 136                         ls_args[0] =  "ls-tree";
 137                         ls_args[1] =  obj_name;
 138                         return cmd_ls_tree(2, ls_args, NULL);
 139                 }
 140
 141                 if (type == OBJ_BLOB)
 142                         return stream_blob(&oid);
 143                 buf = read_object_file(&oid, &type, &size);
 144                 if (!buf)
 145                         die("Cannot read object %s", obj_name);
 146
 147                 /* otherwise just spit out the data */
 148                 break;
 149
 150         case 0:
 151                 if (type_from_string(exp_type) == OBJ_BLOB) {
 152                         struct object_id blob_oid;
 153                         if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 154                                 char *buffer = read_object_file(&oid, &type,
 155                                                                 &size);
 156                                 const char *target;
 157                                 if (!skip_prefix(buffer, "object ", &target) ||
 158                                     get_oid_hex(target, &blob_oid))
 159                                         die("%s not a valid tag", oid_to_hex(&oid));
 160                                 free(buffer);
 161                         } else
 162                                 oidcpy(&blob_oid, &oid);
 163
 164                         if (oid_object_info(the_repository, &blob_oid, NULL) == OBJ_BLOB)
 165                                 return stream_blob(&blob_oid);
 166                         /*
 167                          * we attempted to dereference a tag to a blob
 168                          * and failed; there may be new dereference
 169                          * mechanisms this code is not aware of.
 170                          * fall-back to the usual case.
 171                          */
 172                 }
 173                 buf = read_object_with_reference(&oid, exp_type, &size, NULL);
 174                 break;
 175
 176         default:
 177                 die("git cat-file: unknown option: %s", exp_type);
 178         }
 179
 180         if (!buf)
 181                 die("git cat-file %s: bad file", obj_name);
 182
 183         write_or_die(1, buf, size);
 184         free(buf);
 185         free(obj_context.path);
 186         return 0;
 187 }
 188
 189 struct expand_data {
 190         struct object_id oid;
 191         enum object_type type;
 192         unsigned long size;
 193         off_t disk_size;
 194         const char *rest;
 195         struct object_id delta_base_oid;
 196
 197         /*
 198          * If mark_query is true, we do not expand anything, but rather
 199          * just mark the object_info with items we wish to query.
 200          */
 201         int mark_query;
 202
 203         /*
 204          * Whether to split the input on whitespace before feeding it to
 205          * get_sha1; this is decided during the mark_query phase based on
 206          * whether we have a %(rest) token in our format.
 207          */
 208         int split_on_whitespace;
 209
 210         /*
 211          * After a mark_query run, this object_info is set up to be
 212          * passed to sha1_object_info_extended. It will point to the data
 213          * elements above, so you can retrieve the response from there.
 214          */
 215         struct object_info info;
 216
 217         /*
 218          * This flag will be true if the requested batch format and options
 219          * don't require us to call sha1_object_info, which can then be
 220          * optimized out.
 221          */
 222         unsigned skip_object_info : 1;
 223 };
 224
 225 static int is_atom(const char *atom, const char *s, int slen)
 226 {
 227         int alen = strlen(atom);
 228         return alen == slen && !memcmp(atom, s, alen);
 229 }
 230
 231 static void expand_atom(struct strbuf *sb, const char *atom, int len,
 232                         void *vdata)
 233 {
 234         struct expand_data *data = vdata;
 235
 236         if (is_atom("objectname", atom, len)) {
 237                 if (!data->mark_query)
 238                         strbuf_addstr(sb, oid_to_hex(&data->oid));
 239         } else if (is_atom("objecttype", atom, len)) {
 240                 if (data->mark_query)
 241                         data->info.typep = &data->type;
 242                 else
 243                         strbuf_addstr(sb, type_name(data->type));
 244         } else if (is_atom("objectsize", atom, len)) {
 245                 if (data->mark_query)
 246                         data->info.sizep = &data->size;
 247                 else
 248                         strbuf_addf(sb, "%"PRIuMAX , (uintmax_t)data->size);
 249         } else if (is_atom("objectsize:disk", atom, len)) {
 250                 if (data->mark_query)
 251                         data->info.disk_sizep = &data->disk_size;
 252                 else
 253                         strbuf_addf(sb, "%"PRIuMAX, (uintmax_t)data->disk_size);
 254         } else if (is_atom("rest", atom, len)) {
 255                 if (data->mark_query)
 256                         data->split_on_whitespace = 1;
 257                 else if (data->rest)
 258                         strbuf_addstr(sb, data->rest);
 259         } else if (is_atom("deltabase", atom, len)) {
 260                 if (data->mark_query)
 261                         data->info.delta_base_sha1 = data->delta_base_oid.hash;
 262                 else
 263                         strbuf_addstr(sb,
 264                                       oid_to_hex(&data->delta_base_oid));
 265         } else
 266                 die("unknown format element: %.*s", len, atom);
 267 }
 268
 269 static size_t expand_format(struct strbuf *sb, const char *start, void *data)
 270 {
 271         const char *end;
 272
 273         if (*start != '(')
 274                 return 0;
 275         end = strchr(start + 1, ')');
 276         if (!end)
 277                 die("format element '%s' does not end in ')'", start);
 278
 279         expand_atom(sb, start + 1, end - start - 1, data);
 280
 281         return end - start + 1;
 282 }
 283
 284 static void batch_write(struct batch_options *opt, const void *data, int len)
 285 {
 286         if (opt->buffer_output) {
 287                 if (fwrite(data, 1, len, stdout) != len)
 288                         die_errno("unable to write to stdout");
 289         } else
 290                 write_or_die(1, data, len);
 291 }
 292
 293 static void print_object_or_die(struct batch_options *opt, struct expand_data *data)
 294 {
 295         const struct object_id *oid = &data->oid;
 296
 297         assert(data->info.typep);
 298
 299         if (data->type == OBJ_BLOB) {
 300                 if (opt->buffer_output)
 301                         fflush(stdout);
 302                 if (opt->cmdmode) {
 303                         char *contents;
 304                         unsigned long size;
 305
 306                         if (!data->rest)
 307                                 die("missing path for '%s'", oid_to_hex(oid));
 308
 309                         if (opt->cmdmode == 'w') {
 310                                 if (filter_object(data->rest, 0100644, oid,
 311                                                   &contents, &size))
 312                                         die("could not convert '%s' %s",
 313                                             oid_to_hex(oid), data->rest);
 314                         } else if (opt->cmdmode == 'c') {
 315                                 enum object_type type;
 316                                 if (!textconv_object(the_repository,
 317                                                      data->rest, 0100644, oid,
 318                                                      1, &contents, &size))
 319                                         contents = read_object_file(oid,
 320                                                                     &type,
 321                                                                     &size);
 322                                 if (!contents)
 323                                         die("could not convert '%s' %s",
 324                                             oid_to_hex(oid), data->rest);
 325                         } else
 326                                 BUG("invalid cmdmode: %c", opt->cmdmode);
 327                         batch_write(opt, contents, size);
 328                         free(contents);
 329                 } else {
 330                         stream_blob(oid);
 331                 }
 332         }
 333         else {
 334                 enum object_type type;
 335                 unsigned long size;
 336                 void *contents;
 337
 338                 contents = read_object_file(oid, &type, &size);
 339                 if (!contents)
 340                         die("object %s disappeared", oid_to_hex(oid));
 341                 if (type != data->type)
 342                         die("object %s changed type!?", oid_to_hex(oid));
 343                 if (data->info.sizep && size != data->size)
 344                         die("object %s changed size!?", oid_to_hex(oid));
 345
 346                 batch_write(opt, contents, size);
 347                 free(contents);
 348         }
 349 }
 350
 351 static void batch_object_write(const char *obj_name,
 352                                struct strbuf *scratch,
 353                                struct batch_options *opt,
 354                                struct expand_data *data)
 355 {
 356         if (!data->skip_object_info &&
 357             oid_object_info_extended(the_repository, &data->oid, &data->info,
 358                                      OBJECT_INFO_LOOKUP_REPLACE) < 0) {
 359                 printf("%s missing\n",
 360                        obj_name ? obj_name : oid_to_hex(&data->oid));
 361                 fflush(stdout);
 362                 return;
 363         }
 364
 365         strbuf_reset(scratch);
 366         strbuf_expand(scratch, opt->format, expand_format, data);
 367         strbuf_addch(scratch, '\n');
 368         batch_write(opt, scratch->buf, scratch->len);
 369
 370         if (opt->print_contents) {
 371                 print_object_or_die(opt, data);
 372                 batch_write(opt, "\n", 1);
 373         }
 374 }
 375
 376 static void batch_one_object(const char *obj_name,
 377                              struct strbuf *scratch,
 378                              struct batch_options *opt,
 379                              struct expand_data *data)
 380 {
 381         struct object_context ctx;
 382         int flags = opt->follow_symlinks ? GET_OID_FOLLOW_SYMLINKS : 0;
 383         enum get_oid_result result;
 384
 385         result = get_oid_with_context(obj_name, flags, &data->oid, &ctx);
 386         if (result != FOUND) {
 387                 switch (result) {
 388                 case MISSING_OBJECT:
 389                         printf("%s missing\n", obj_name);
 390                         break;
 391                 case SHORT_NAME_AMBIGUOUS:
 392                         printf("%s ambiguous\n", obj_name);
 393                         break;
 394                 case DANGLING_SYMLINK:
 395                         printf("dangling %"PRIuMAX"\n%s\n",
 396                                (uintmax_t)strlen(obj_name), obj_name);
 397                         break;
 398                 case SYMLINK_LOOP:
 399                         printf("loop %"PRIuMAX"\n%s\n",
 400                                (uintmax_t)strlen(obj_name), obj_name);
 401                         break;
 402                 case NOT_DIR:
 403                         printf("notdir %"PRIuMAX"\n%s\n",
 404                                (uintmax_t)strlen(obj_name), obj_name);
 405                         break;
 406                 default:
 407                         BUG("unknown get_sha1_with_context result %d\n",
 408                                result);
 409                         break;
 410                 }
 411                 fflush(stdout);
 412                 return;
 413         }
 414
 415         if (ctx.mode == 0) {
 416                 printf("symlink %"PRIuMAX"\n%s\n",
 417                        (uintmax_t)ctx.symlink_path.len,
 418                        ctx.symlink_path.buf);
 419                 fflush(stdout);
 420                 return;
 421         }
 422
 423         batch_object_write(obj_name, scratch, opt, data);
 424 }
 425
 426 struct object_cb_data {
 427         struct batch_options *opt;
 428         struct expand_data *expand;
 429         struct oidset *seen;
 430         struct strbuf *scratch;
 431 };
 432
 433 static int batch_object_cb(const struct object_id *oid, void *vdata)
 434 {
 435         struct object_cb_data *data = vdata;
 436         oidcpy(&data->expand->oid, oid);
 437         batch_object_write(NULL, data->scratch, data->opt, data->expand);
 438         return 0;
 439 }
 440
 441 static int collect_loose_object(const struct object_id *oid,
 442                                 const char *path,
 443                                 void *data)
 444 {
 445         oid_array_append(data, oid);
 446         return 0;
 447 }
 448
 449 static int collect_packed_object(const struct object_id *oid,
 450                                  struct packed_git *pack,
 451                                  uint32_t pos,
 452                                  void *data)
 453 {
 454         oid_array_append(data, oid);
 455         return 0;
 456 }
 457
 458 static int batch_unordered_object(const struct object_id *oid, void *vdata)
 459 {
 460         struct object_cb_data *data = vdata;
 461
 462         if (oidset_insert(data->seen, oid))
 463                 return 0;
 464
 465         return batch_object_cb(oid, data);
 466 }
 467
 468 static int batch_unordered_loose(const struct object_id *oid,
 469                                  const char *path,
 470                                  void *data)
 471 {
 472         return batch_unordered_object(oid, data);
 473 }
 474
 475 static int batch_unordered_packed(const struct object_id *oid,
 476                                   struct packed_git *pack,
 477                                   uint32_t pos,
 478                                   void *data)
 479 {
 480         return batch_unordered_object(oid, data);
 481 }
 482
 483 static int batch_objects(struct batch_options *opt)
 484 {
 485         struct strbuf input = STRBUF_INIT;
 486         struct strbuf output = STRBUF_INIT;
 487         struct expand_data data;
 488         int save_warning;
 489         int retval = 0;
 490
 491         if (!opt->format)
 492                 opt->format = "%(objectname) %(objecttype) %(objectsize)";
 493
 494         /*
 495          * Expand once with our special mark_query flag, which will prime the
 496          * object_info to be handed to sha1_object_info_extended for each
 497          * object.
 498          */
 499         memset(&data, 0, sizeof(data));
 500         data.mark_query = 1;
 501         strbuf_expand(&output, opt->format, expand_format, &data);
 502         data.mark_query = 0;
 503         strbuf_release(&output);
 504         if (opt->cmdmode)
 505                 data.split_on_whitespace = 1;
 506
 507         if (opt->all_objects) {
 508                 struct object_info empty = OBJECT_INFO_INIT;
 509                 if (!memcmp(&data.info, &empty, sizeof(empty)))
 510                         data.skip_object_info = 1;
 511         }
 512
 513         /*
 514          * If we are printing out the object, then always fill in the type,
 515          * since we will want to decide whether or not to stream.
 516          */
 517         if (opt->print_contents)
 518                 data.info.typep = &data.type;
 519
 520         if (opt->all_objects) {
 521                 struct object_cb_data cb;
 522
 523                 if (repository_format_partial_clone)
 524                         warning("This repository has extensions.partialClone set. Some objects may not be loaded.");
 525
 526                 cb.opt = opt;
 527                 cb.expand = &data;
 528                 cb.scratch = &output;
 529
 530                 if (opt->unordered) {
 531                         struct oidset seen = OIDSET_INIT;
 532
 533                         cb.seen = &seen;
 534
 535                         for_each_loose_object(batch_unordered_loose, &cb, 0);
 536                         for_each_packed_object(batch_unordered_packed, &cb,
 537                                                FOR_EACH_OBJECT_PACK_ORDER);
 538
 539                         oidset_clear(&seen);
 540                 } else {
 541                         struct oid_array sa = OID_ARRAY_INIT;
 542
 543                         for_each_loose_object(collect_loose_object, &sa, 0);
 544                         for_each_packed_object(collect_packed_object, &sa, 0);
 545
 546                         oid_array_for_each_unique(&sa, batch_object_cb, &cb);
 547
 548                         oid_array_clear(&sa);
 549                 }
 550
 551                 strbuf_release(&output);
 552                 return 0;
 553         }
 554
 555         /*
 556          * We are going to call get_sha1 on a potentially very large number of
 557          * objects. In most large cases, these will be actual object sha1s. The
 558          * cost to double-check that each one is not also a ref (just so we can
 559          * warn) ends up dwarfing the actual cost of the object lookups
 560          * themselves. We can work around it by just turning off the warning.
 561          */
 562         save_warning = warn_on_object_refname_ambiguity;
 563         warn_on_object_refname_ambiguity = 0;
 564
 565         while (strbuf_getline(&input, stdin) != EOF) {
 566                 if (data.split_on_whitespace) {
 567                         /*
 568                          * Split at first whitespace, tying off the beginning
 569                          * of the string and saving the remainder (or NULL) in
 570                          * data.rest.
 571                          */
 572                         char *p = strpbrk(input.buf, " \t");
 573                         if (p) {
 574                                 while (*p && strchr(" \t", *p))
 575                                         *p++ = '\0';
 576                         }
 577                         data.rest = p;
 578                 }
 579
 580                 batch_one_object(input.buf, &output, opt, &data);
 581         }
 582
 583         strbuf_release(&input);
 584         strbuf_release(&output);
 585         warn_on_object_refname_ambiguity = save_warning;
 586         return retval;
 587 }
 588
 589 static const char * const cat_file_usage[] = {
 590         N_("git cat-file (-t [--allow-unknown-type] | -s [--allow-unknown-type] | -e | -p | <type> | --textconv | --filters) [--path=<path>] <object>"),
 591         N_("git cat-file (--batch | --batch-check) [--follow-symlinks] [--textconv | --filters]"),
 592         NULL
 593 };
 594
 595 static int git_cat_file_config(const char *var, const char *value, void *cb)
 596 {
 597         if (userdiff_config(var, value) < 0)
 598                 return -1;
 599
 600         return git_default_config(var, value, cb);
 601 }
 602
 603 static int batch_option_callback(const struct option *opt,
 604                                  const char *arg,
 605                                  int unset)
 606 {
 607         struct batch_options *bo = opt->value;
 608
 609         BUG_ON_OPT_NEG(unset);
 610
 611         if (bo->enabled) {
 612                 return error(_("only one batch option may be specified"));
 613         }
 614
 615         bo->enabled = 1;
 616         bo->print_contents = !strcmp(opt->long_name, "batch");
 617         bo->format = arg;
 618
 619         return 0;
 620 }
 621
 622 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 623 {
 624         int opt = 0;
 625         const char *exp_type = NULL, *obj_name = NULL;
 626         struct batch_options batch = {0};
 627         int unknown_type = 0;
 628
 629         const struct option options[] = {
 630                 OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 631                 OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
 632                 OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
 633                 OPT_CMDMODE('e', NULL, &opt,
 634                             N_("exit with zero when there's no error"), 'e'),
 635                 OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 636                 OPT_CMDMODE(0, "textconv", &opt,
 637                             N_("for blob objects, run textconv on object's content"), 'c'),
 638                 OPT_CMDMODE(0, "filters", &opt,
 639                             N_("for blob objects, run filters on object's content"), 'w'),
 640                 OPT_STRING(0, "path", &force_path, N_("blob"),
 641                            N_("use a specific path for --textconv/--filters")),
 642                 OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 643                           N_("allow -s and -t to work with broken/corrupt objects")),
 644                 OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
 645                 { OPTION_CALLBACK, 0, "batch", &batch, "format",
 646                         N_("show info and content of objects fed from the standard input"),
 647                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 648                         batch_option_callback },
 649                 { OPTION_CALLBACK, 0, "batch-check", &batch, "format",
 650                         N_("show info about objects fed from the standard input"),
 651                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 652                         batch_option_callback },
 653                 OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 654                          N_("follow in-tree symlinks (used with --batch or --batch-check)")),
 655                 OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
 656                          N_("show all objects with --batch or --batch-check")),
 657                 OPT_BOOL(0, "unordered", &batch.unordered,
 658                          N_("do not order --batch-all-objects output")),
 659                 OPT_END()
 660         };
 661
 662         git_config(git_cat_file_config, NULL);
 663
 664         batch.buffer_output = -1;
 665         argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 666
 667         if (opt) {
 668                 if (batch.enabled && (opt == 'c' || opt == 'w'))
 669                         batch.cmdmode = opt;
 670                 else if (argc == 1)
 671                         obj_name = argv[0];
 672                 else
 673                         usage_with_options(cat_file_usage, options);
 674         }
 675         if (!opt && !batch.enabled) {
 676                 if (argc == 2) {
 677                         exp_type = argv[0];
 678                         obj_name = argv[1];
 679                 } else
 680                         usage_with_options(cat_file_usage, options);
 681         }
 682         if (batch.enabled) {
 683                 if (batch.cmdmode != opt || argc)
 684                         usage_with_options(cat_file_usage, options);
 685                 if (batch.cmdmode && batch.all_objects)
 686                         die("--batch-all-objects cannot be combined with "
 687                             "--textconv nor with --filters");
 688         }
 689
 690         if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 691                 usage_with_options(cat_file_usage, options);
 692         }
 693
 694         if (force_path && opt != 'c' && opt != 'w') {
 695                 error("--path=<path> needs --textconv or --filters");
 696                 usage_with_options(cat_file_usage, options);
 697         }
 698
 699         if (force_path && batch.enabled) {
 700                 error("--path=<path> incompatible with --batch");
 701                 usage_with_options(cat_file_usage, options);
 702         }
 703
 704         if (batch.buffer_output < 0)
 705                 batch.buffer_output = batch.all_objects;
 706
 707         if (batch.enabled)
 708                 return batch_objects(&batch);
 709
 710         if (unknown_type && opt != 't' && opt != 's')
 711                 die("git cat-file --allow-unknown-type: use with -s or -t");
 712         return cat_one_file(opt, exp_type, obj_name, unknown_type);
 713 }