builtin/grep.c

   1 /*
   2  * Builtin "git grep"
   3  *
   4  * Copyright (c) 2006 Junio C Hamano
   5  */
   6 #include "cache.h"
   7 #include "blob.h"
   8 #include "tree.h"
   9 #include "commit.h"
  10 #include "tag.h"
  11 #include "tree-walk.h"
  12 #include "builtin.h"
  13 #include "parse-options.h"
  14 #include "string-list.h"
  15 #include "run-command.h"
  16 #include "userdiff.h"
  17 #include "grep.h"
  18 #include "quote.h"
  19 #include "dir.h"
  20 #include "pathspec.h"
  21 #include "submodule.h"
  22 #include "submodule-config.h"
  23
  24 static char const * const grep_usage[] = {
  25         N_("git grep [<options>] [-e] <pattern> [<rev>...] [[--] <path>...]"),
  26         NULL
  27 };
  28
  29 static const char *super_prefix;
  30 static int recurse_submodules;
  31 static struct argv_array submodule_options = ARGV_ARRAY_INIT;
  32 static const char *parent_basename;
  33
  34 static int grep_submodule_launch(struct grep_opt *opt,
  35                                  const struct grep_source *gs);
  36
  37 #define GREP_NUM_THREADS_DEFAULT 8
  38 static int num_threads;
  39
  40 #ifndef NO_PTHREADS
  41 static pthread_t *threads;
  42
  43 /* We use one producer thread and THREADS consumer
  44  * threads. The producer adds struct work_items to 'todo' and the
  45  * consumers pick work items from the same array.
  46  */
  47 struct work_item {
  48         struct grep_source source;
  49         char done;
  50         struct strbuf out;
  51 };
  52
  53 /* In the range [todo_done, todo_start) in 'todo' we have work_items
  54  * that have been or are processed by a consumer thread. We haven't
  55  * written the result for these to stdout yet.
  56  *
  57  * The work_items in [todo_start, todo_end) are waiting to be picked
  58  * up by a consumer thread.
  59  *
  60  * The ranges are modulo TODO_SIZE.
  61  */
  62 #define TODO_SIZE 128
  63 static struct work_item todo[TODO_SIZE];
  64 static int todo_start;
  65 static int todo_end;
  66 static int todo_done;
  67
  68 /* Has all work items been added? */
  69 static int all_work_added;
  70
  71 /* This lock protects all the variables above. */
  72 static pthread_mutex_t grep_mutex;
  73
  74 static inline void grep_lock(void)
  75 {
  76         assert(num_threads);
  77         pthread_mutex_lock(&grep_mutex);
  78 }
  79
  80 static inline void grep_unlock(void)
  81 {
  82         assert(num_threads);
  83         pthread_mutex_unlock(&grep_mutex);
  84 }
  85
  86 /* Signalled when a new work_item is added to todo. */
  87 static pthread_cond_t cond_add;
  88
  89 /* Signalled when the result from one work_item is written to
  90  * stdout.
  91  */
  92 static pthread_cond_t cond_write;
  93
  94 /* Signalled when we are finished with everything. */
  95 static pthread_cond_t cond_result;
  96
  97 static int skip_first_line;
  98
  99 static void add_work(struct grep_opt *opt, enum grep_source_type type,
 100                      const char *name, const char *path, const void *id)
 101 {
 102         grep_lock();
 103
 104         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
 105                 pthread_cond_wait(&cond_write, &grep_mutex);
 106         }
 107
 108         grep_source_init(&todo[todo_end].source, type, name, path, id);
 109         if (opt->binary != GREP_BINARY_TEXT)
 110                 grep_source_load_driver(&todo[todo_end].source);
 111         todo[todo_end].done = 0;
 112         strbuf_reset(&todo[todo_end].out);
 113         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
 114
 115         pthread_cond_signal(&cond_add);
 116         grep_unlock();
 117 }
 118
 119 static struct work_item *get_work(void)
 120 {
 121         struct work_item *ret;
 122
 123         grep_lock();
 124         while (todo_start == todo_end && !all_work_added) {
 125                 pthread_cond_wait(&cond_add, &grep_mutex);
 126         }
 127
 128         if (todo_start == todo_end && all_work_added) {
 129                 ret = NULL;
 130         } else {
 131                 ret = &todo[todo_start];
 132                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
 133         }
 134         grep_unlock();
 135         return ret;
 136 }
 137
 138 static void work_done(struct work_item *w)
 139 {
 140         int old_done;
 141
 142         grep_lock();
 143         w->done = 1;
 144         old_done = todo_done;
 145         for(; todo[todo_done].done && todo_done != todo_start;
 146             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
 147                 w = &todo[todo_done];
 148                 if (w->out.len) {
 149                         const char *p = w->out.buf;
 150                         size_t len = w->out.len;
 151
 152                         /* Skip the leading hunk mark of the first file. */
 153                         if (skip_first_line) {
 154                                 while (len) {
 155                                         len--;
 156                                         if (*p++ == '\n')
 157                                                 break;
 158                                 }
 159                                 skip_first_line = 0;
 160                         }
 161
 162                         write_or_die(1, p, len);
 163                 }
 164                 grep_source_clear(&w->source);
 165         }
 166
 167         if (old_done != todo_done)
 168                 pthread_cond_signal(&cond_write);
 169
 170         if (all_work_added && todo_done == todo_end)
 171                 pthread_cond_signal(&cond_result);
 172
 173         grep_unlock();
 174 }
 175
 176 static void *run(void *arg)
 177 {
 178         int hit = 0;
 179         struct grep_opt *opt = arg;
 180
 181         while (1) {
 182                 struct work_item *w = get_work();
 183                 if (!w)
 184                         break;
 185
 186                 opt->output_priv = w;
 187                 if (w->source.type == GREP_SOURCE_SUBMODULE)
 188                         hit |= grep_submodule_launch(opt, &w->source);
 189                 else
 190                         hit |= grep_source(opt, &w->source);
 191                 grep_source_clear_data(&w->source);
 192                 work_done(w);
 193         }
 194         free_grep_patterns(arg);
 195         free(arg);
 196
 197         return (void*) (intptr_t) hit;
 198 }
 199
 200 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
 201 {
 202         struct work_item *w = opt->output_priv;
 203         strbuf_add(&w->out, buf, size);
 204 }
 205
 206 static void start_threads(struct grep_opt *opt)
 207 {
 208         int i;
 209
 210         pthread_mutex_init(&grep_mutex, NULL);
 211         pthread_mutex_init(&grep_read_mutex, NULL);
 212         pthread_mutex_init(&grep_attr_mutex, NULL);
 213         pthread_cond_init(&cond_add, NULL);
 214         pthread_cond_init(&cond_write, NULL);
 215         pthread_cond_init(&cond_result, NULL);
 216         grep_use_locks = 1;
 217
 218         for (i = 0; i < ARRAY_SIZE(todo); i++) {
 219                 strbuf_init(&todo[i].out, 0);
 220         }
 221
 222         threads = xcalloc(num_threads, sizeof(*threads));
 223         for (i = 0; i < num_threads; i++) {
 224                 int err;
 225                 struct grep_opt *o = grep_opt_dup(opt);
 226                 o->output = strbuf_out;
 227                 if (i)
 228                         o->debug = 0;
 229                 compile_grep_patterns(o);
 230                 err = pthread_create(&threads[i], NULL, run, o);
 231
 232                 if (err)
 233                         die(_("grep: failed to create thread: %s"),
 234                             strerror(err));
 235         }
 236 }
 237
 238 static int wait_all(void)
 239 {
 240         int hit = 0;
 241         int i;
 242
 243         grep_lock();
 244         all_work_added = 1;
 245
 246         /* Wait until all work is done. */
 247         while (todo_done != todo_end)
 248                 pthread_cond_wait(&cond_result, &grep_mutex);
 249
 250         /* Wake up all the consumer threads so they can see that there
 251          * is no more work to do.
 252          */
 253         pthread_cond_broadcast(&cond_add);
 254         grep_unlock();
 255
 256         for (i = 0; i < num_threads; i++) {
 257                 void *h;
 258                 pthread_join(threads[i], &h);
 259                 hit |= (int) (intptr_t) h;
 260         }
 261
 262         free(threads);
 263
 264         pthread_mutex_destroy(&grep_mutex);
 265         pthread_mutex_destroy(&grep_read_mutex);
 266         pthread_mutex_destroy(&grep_attr_mutex);
 267         pthread_cond_destroy(&cond_add);
 268         pthread_cond_destroy(&cond_write);
 269         pthread_cond_destroy(&cond_result);
 270         grep_use_locks = 0;
 271
 272         return hit;
 273 }
 274 #else /* !NO_PTHREADS */
 275
 276 static int wait_all(void)
 277 {
 278         return 0;
 279 }
 280 #endif
 281
 282 static int grep_cmd_config(const char *var, const char *value, void *cb)
 283 {
 284         int st = grep_config(var, value, cb);
 285         if (git_color_default_config(var, value, cb) < 0)
 286                 st = -1;
 287
 288         if (!strcmp(var, "grep.threads")) {
 289                 num_threads = git_config_int(var, value);
 290                 if (num_threads < 0)
 291                         die(_("invalid number of threads specified (%d) for %s"),
 292                             num_threads, var);
 293 #ifdef NO_PTHREADS
 294                 else if (num_threads && num_threads != 1) {
 295                         /*
 296                          * TRANSLATORS: %s is the configuration
 297                          * variable for tweaking threads, currently
 298                          * grep.threads
 299                          */
 300                         warning(_("no threads support, ignoring %s"), var);
 301                         num_threads = 0;
 302                 }
 303 #endif
 304         }
 305
 306         if (!strcmp(var, "submodule.recurse"))
 307                 recurse_submodules = git_config_bool(var, value);
 308
 309         return st;
 310 }
 311
 312 static void *lock_and_read_oid_file(const struct object_id *oid, enum object_type *type, unsigned long *size)
 313 {
 314         void *data;
 315
 316         grep_read_lock();
 317         data = read_sha1_file(oid->hash, type, size);
 318         grep_read_unlock();
 319         return data;
 320 }
 321
 322 static int grep_oid(struct grep_opt *opt, const struct object_id *oid,
 323                      const char *filename, int tree_name_len,
 324                      const char *path)
 325 {
 326         struct strbuf pathbuf = STRBUF_INIT;
 327
 328         if (super_prefix) {
 329                 strbuf_add(&pathbuf, filename, tree_name_len);
 330                 strbuf_addstr(&pathbuf, super_prefix);
 331                 strbuf_addstr(&pathbuf, filename + tree_name_len);
 332         } else {
 333                 strbuf_addstr(&pathbuf, filename);
 334         }
 335
 336         if (opt->relative && opt->prefix_length) {
 337                 char *name = strbuf_detach(&pathbuf, NULL);
 338                 quote_path_relative(name + tree_name_len, opt->prefix, &pathbuf);
 339                 strbuf_insert(&pathbuf, 0, name, tree_name_len);
 340                 free(name);
 341         }
 342
 343 #ifndef NO_PTHREADS
 344         if (num_threads) {
 345                 add_work(opt, GREP_SOURCE_OID, pathbuf.buf, path, oid);
 346                 strbuf_release(&pathbuf);
 347                 return 0;
 348         } else
 349 #endif
 350         {
 351                 struct grep_source gs;
 352                 int hit;
 353
 354                 grep_source_init(&gs, GREP_SOURCE_OID, pathbuf.buf, path, oid);
 355                 strbuf_release(&pathbuf);
 356                 hit = grep_source(opt, &gs);
 357
 358                 grep_source_clear(&gs);
 359                 return hit;
 360         }
 361 }
 362
 363 static int grep_file(struct grep_opt *opt, const char *filename)
 364 {
 365         struct strbuf buf = STRBUF_INIT;
 366
 367         if (super_prefix)
 368                 strbuf_addstr(&buf, super_prefix);
 369         strbuf_addstr(&buf, filename);
 370
 371         if (opt->relative && opt->prefix_length) {
 372                 char *name = strbuf_detach(&buf, NULL);
 373                 quote_path_relative(name, opt->prefix, &buf);
 374                 free(name);
 375         }
 376
 377 #ifndef NO_PTHREADS
 378         if (num_threads) {
 379                 add_work(opt, GREP_SOURCE_FILE, buf.buf, filename, filename);
 380                 strbuf_release(&buf);
 381                 return 0;
 382         } else
 383 #endif
 384         {
 385                 struct grep_source gs;
 386                 int hit;
 387
 388                 grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename, filename);
 389                 strbuf_release(&buf);
 390                 hit = grep_source(opt, &gs);
 391
 392                 grep_source_clear(&gs);
 393                 return hit;
 394         }
 395 }
 396
 397 static void append_path(struct grep_opt *opt, const void *data, size_t len)
 398 {
 399         struct string_list *path_list = opt->output_priv;
 400
 401         if (len == 1 && *(const char *)data == '\0')
 402                 return;
 403         string_list_append(path_list, xstrndup(data, len));
 404 }
 405
 406 static void run_pager(struct grep_opt *opt, const char *prefix)
 407 {
 408         struct string_list *path_list = opt->output_priv;
 409         struct child_process child = CHILD_PROCESS_INIT;
 410         int i, status;
 411
 412         for (i = 0; i < path_list->nr; i++)
 413                 argv_array_push(&child.args, path_list->items[i].string);
 414         child.dir = prefix;
 415         child.use_shell = 1;
 416
 417         status = run_command(&child);
 418         if (status)
 419                 exit(status);
 420 }
 421
 422 static void compile_submodule_options(const struct grep_opt *opt,
 423                                       const char **argv,
 424                                       int cached, int untracked,
 425                                       int opt_exclude, int use_index,
 426                                       int pattern_type_arg)
 427 {
 428         struct grep_pat *pattern;
 429
 430         if (recurse_submodules)
 431                 argv_array_push(&submodule_options, "--recurse-submodules");
 432
 433         if (cached)
 434                 argv_array_push(&submodule_options, "--cached");
 435         if (!use_index)
 436                 argv_array_push(&submodule_options, "--no-index");
 437         if (untracked)
 438                 argv_array_push(&submodule_options, "--untracked");
 439         if (opt_exclude > 0)
 440                 argv_array_push(&submodule_options, "--exclude-standard");
 441
 442         if (opt->invert)
 443                 argv_array_push(&submodule_options, "-v");
 444         if (opt->ignore_case)
 445                 argv_array_push(&submodule_options, "-i");
 446         if (opt->word_regexp)
 447                 argv_array_push(&submodule_options, "-w");
 448         switch (opt->binary) {
 449         case GREP_BINARY_NOMATCH:
 450                 argv_array_push(&submodule_options, "-I");
 451                 break;
 452         case GREP_BINARY_TEXT:
 453                 argv_array_push(&submodule_options, "-a");
 454                 break;
 455         default:
 456                 break;
 457         }
 458         if (opt->allow_textconv)
 459                 argv_array_push(&submodule_options, "--textconv");
 460         if (opt->max_depth != -1)
 461                 argv_array_pushf(&submodule_options, "--max-depth=%d",
 462                                  opt->max_depth);
 463         if (opt->linenum)
 464                 argv_array_push(&submodule_options, "-n");
 465         if (!opt->pathname)
 466                 argv_array_push(&submodule_options, "-h");
 467         if (!opt->relative)
 468                 argv_array_push(&submodule_options, "--full-name");
 469         if (opt->name_only)
 470                 argv_array_push(&submodule_options, "-l");
 471         if (opt->unmatch_name_only)
 472                 argv_array_push(&submodule_options, "-L");
 473         if (opt->null_following_name)
 474                 argv_array_push(&submodule_options, "-z");
 475         if (opt->count)
 476                 argv_array_push(&submodule_options, "-c");
 477         if (opt->file_break)
 478                 argv_array_push(&submodule_options, "--break");
 479         if (opt->heading)
 480                 argv_array_push(&submodule_options, "--heading");
 481         if (opt->pre_context)
 482                 argv_array_pushf(&submodule_options, "--before-context=%d",
 483                                  opt->pre_context);
 484         if (opt->post_context)
 485                 argv_array_pushf(&submodule_options, "--after-context=%d",
 486                                  opt->post_context);
 487         if (opt->funcname)
 488                 argv_array_push(&submodule_options, "-p");
 489         if (opt->funcbody)
 490                 argv_array_push(&submodule_options, "-W");
 491         if (opt->all_match)
 492                 argv_array_push(&submodule_options, "--all-match");
 493         if (opt->debug)
 494                 argv_array_push(&submodule_options, "--debug");
 495         if (opt->status_only)
 496                 argv_array_push(&submodule_options, "-q");
 497
 498         switch (pattern_type_arg) {
 499         case GREP_PATTERN_TYPE_BRE:
 500                 argv_array_push(&submodule_options, "-G");
 501                 break;
 502         case GREP_PATTERN_TYPE_ERE:
 503                 argv_array_push(&submodule_options, "-E");
 504                 break;
 505         case GREP_PATTERN_TYPE_FIXED:
 506                 argv_array_push(&submodule_options, "-F");
 507                 break;
 508         case GREP_PATTERN_TYPE_PCRE:
 509                 argv_array_push(&submodule_options, "-P");
 510                 break;
 511         case GREP_PATTERN_TYPE_UNSPECIFIED:
 512                 break;
 513         default:
 514                 die("BUG: Added a new grep pattern type without updating switch statement");
 515         }
 516
 517         for (pattern = opt->pattern_list; pattern != NULL;
 518              pattern = pattern->next) {
 519                 switch (pattern->token) {
 520                 case GREP_PATTERN:
 521                         argv_array_pushf(&submodule_options, "-e%s",
 522                                          pattern->pattern);
 523                         break;
 524                 case GREP_AND:
 525                 case GREP_OPEN_PAREN:
 526                 case GREP_CLOSE_PAREN:
 527                 case GREP_NOT:
 528                 case GREP_OR:
 529                         argv_array_push(&submodule_options, pattern->pattern);
 530                         break;
 531                 /* BODY and HEAD are not used by git-grep */
 532                 case GREP_PATTERN_BODY:
 533                 case GREP_PATTERN_HEAD:
 534                         break;
 535                 }
 536         }
 537
 538         /*
 539          * Limit number of threads for child process to use.
 540          * This is to prevent potential fork-bomb behavior of git-grep as each
 541          * submodule process has its own thread pool.
 542          */
 543         argv_array_pushf(&submodule_options, "--threads=%d",
 544                          (num_threads + 1) / 2);
 545
 546         /* Add Pathspecs */
 547         argv_array_push(&submodule_options, "--");
 548         for (; *argv; argv++)
 549                 argv_array_push(&submodule_options, *argv);
 550 }
 551
 552 /*
 553  * Launch child process to grep contents of a submodule
 554  */
 555 static int grep_submodule_launch(struct grep_opt *opt,
 556                                  const struct grep_source *gs)
 557 {
 558         struct child_process cp = CHILD_PROCESS_INIT;
 559         int status, i;
 560         const char *end_of_base;
 561         const char *name;
 562         struct strbuf child_output = STRBUF_INIT;
 563
 564         end_of_base = strchr(gs->name, ':');
 565         if (gs->identifier && end_of_base)
 566                 name = end_of_base + 1;
 567         else
 568                 name = gs->name;
 569
 570         prepare_submodule_repo_env(&cp.env_array);
 571         argv_array_push(&cp.env_array, GIT_DIR_ENVIRONMENT);
 572
 573         if (opt->relative && opt->prefix_length)
 574                 argv_array_pushf(&cp.env_array, "%s=%s",
 575                                  GIT_TOPLEVEL_PREFIX_ENVIRONMENT,
 576                                  opt->prefix);
 577
 578         /* Add super prefix */
 579         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
 580                          super_prefix ? super_prefix : "",
 581                          name);
 582         argv_array_push(&cp.args, "grep");
 583
 584         /*
 585          * Add basename of parent project
 586          * When performing grep on a tree object the filename is prefixed
 587          * with the object's name: 'tree-name:filename'.  In order to
 588          * provide uniformity of output we want to pass the name of the
 589          * parent project's object name to the submodule so the submodule can
 590          * prefix its output with the parent's name and not its own OID.
 591          */
 592         if (gs->identifier && end_of_base)
 593                 argv_array_pushf(&cp.args, "--parent-basename=%.*s",
 594                                  (int) (end_of_base - gs->name),
 595                                  gs->name);
 596
 597         /* Add options */
 598         for (i = 0; i < submodule_options.argc; i++) {
 599                 /*
 600                  * If there is a tree identifier for the submodule, add the
 601                  * rev after adding the submodule options but before the
 602                  * pathspecs.  To do this we listen for the '--' and insert the
 603                  * oid before pushing the '--' onto the child process argv
 604                  * array.
 605                  */
 606                 if (gs->identifier &&
 607                     !strcmp("--", submodule_options.argv[i])) {
 608                         argv_array_push(&cp.args, oid_to_hex(gs->identifier));
 609                 }
 610
 611                 argv_array_push(&cp.args, submodule_options.argv[i]);
 612         }
 613
 614         cp.git_cmd = 1;
 615         cp.dir = gs->path;
 616
 617         /*
 618          * Capture output to output buffer and check the return code from the
 619          * child process.  A '0' indicates a hit, a '1' indicates no hit and
 620          * anything else is an error.
 621          */
 622         status = capture_command(&cp, &child_output, 0);
 623         if (status && (status != 1)) {
 624                 /* flush the buffer */
 625                 write_or_die(1, child_output.buf, child_output.len);
 626                 die("process for submodule '%s' failed with exit code: %d",
 627                     gs->name, status);
 628         }
 629
 630         opt->output(opt, child_output.buf, child_output.len);
 631         strbuf_release(&child_output);
 632         /* invert the return code to make a hit equal to 1 */
 633         return !status;
 634 }
 635
 636 /*
 637  * Prep grep structures for a submodule grep
 638  * oid: the oid of the submodule or NULL if using the working tree
 639  * filename: name of the submodule including tree name of parent
 640  * path: location of the submodule
 641  */
 642 static int grep_submodule(struct grep_opt *opt, const struct object_id *oid,
 643                           const char *filename, const char *path)
 644 {
 645         if (!is_submodule_initialized(path))
 646                 return 0;
 647         if (!is_submodule_populated_gently(path, NULL)) {
 648                 /*
 649                  * If searching history, check for the presense of the
 650                  * submodule's gitdir before skipping the submodule.
 651                  */
 652                 if (oid) {
 653                         const struct submodule *sub =
 654                                         submodule_from_path(null_sha1, path);
 655                         if (sub)
 656                                 path = git_path("modules/%s", sub->name);
 657
 658                         if (!(is_directory(path) && is_git_directory(path)))
 659                                 return 0;
 660                 } else {
 661                         return 0;
 662                 }
 663         }
 664
 665 #ifndef NO_PTHREADS
 666         if (num_threads) {
 667                 add_work(opt, GREP_SOURCE_SUBMODULE, filename, path, oid);
 668                 return 0;
 669         } else
 670 #endif
 671         {
 672                 struct grep_source gs;
 673                 int hit;
 674
 675                 grep_source_init(&gs, GREP_SOURCE_SUBMODULE,
 676                                  filename, path, oid);
 677                 hit = grep_submodule_launch(opt, &gs);
 678
 679                 grep_source_clear(&gs);
 680                 return hit;
 681         }
 682 }
 683
 684 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec,
 685                       int cached)
 686 {
 687         int hit = 0;
 688         int nr;
 689         struct strbuf name = STRBUF_INIT;
 690         int name_base_len = 0;
 691         if (super_prefix) {
 692                 name_base_len = strlen(super_prefix);
 693                 strbuf_addstr(&name, super_prefix);
 694         }
 695
 696         read_cache();
 697
 698         for (nr = 0; nr < active_nr; nr++) {
 699                 const struct cache_entry *ce = active_cache[nr];
 700                 strbuf_setlen(&name, name_base_len);
 701                 strbuf_addstr(&name, ce->name);
 702
 703                 if (S_ISREG(ce->ce_mode) &&
 704                     match_pathspec(pathspec, name.buf, name.len, 0, NULL,
 705                                    S_ISDIR(ce->ce_mode) ||
 706                                    S_ISGITLINK(ce->ce_mode))) {
 707                         /*
 708                          * If CE_VALID is on, we assume worktree file and its
 709                          * cache entry are identical, even if worktree file has
 710                          * been modified, so use cache version instead
 711                          */
 712                         if (cached || (ce->ce_flags & CE_VALID) ||
 713                             ce_skip_worktree(ce)) {
 714                                 if (ce_stage(ce) || ce_intent_to_add(ce))
 715                                         continue;
 716                                 hit |= grep_oid(opt, &ce->oid, ce->name,
 717                                                  0, ce->name);
 718                         } else {
 719                                 hit |= grep_file(opt, ce->name);
 720                         }
 721                 } else if (recurse_submodules && S_ISGITLINK(ce->ce_mode) &&
 722                            submodule_path_match(pathspec, name.buf, NULL)) {
 723                         hit |= grep_submodule(opt, NULL, ce->name, ce->name);
 724                 } else {
 725                         continue;
 726                 }
 727
 728                 if (ce_stage(ce)) {
 729                         do {
 730                                 nr++;
 731                         } while (nr < active_nr &&
 732                                  !strcmp(ce->name, active_cache[nr]->name));
 733                         nr--; /* compensate for loop control */
 734                 }
 735                 if (hit && opt->status_only)
 736                         break;
 737         }
 738
 739         strbuf_release(&name);
 740         return hit;
 741 }
 742
 743 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 744                      struct tree_desc *tree, struct strbuf *base, int tn_len,
 745                      int check_attr)
 746 {
 747         int hit = 0;
 748         enum interesting match = entry_not_interesting;
 749         struct name_entry entry;
 750         int old_baselen = base->len;
 751         struct strbuf name = STRBUF_INIT;
 752         int name_base_len = 0;
 753         if (super_prefix) {
 754                 strbuf_addstr(&name, super_prefix);
 755                 name_base_len = name.len;
 756         }
 757
 758         while (tree_entry(tree, &entry)) {
 759                 int te_len = tree_entry_len(&entry);
 760
 761                 if (match != all_entries_interesting) {
 762                         strbuf_addstr(&name, base->buf + tn_len);
 763                         match = tree_entry_interesting(&entry, &name,
 764                                                        0, pathspec);
 765                         strbuf_setlen(&name, name_base_len);
 766
 767                         if (match == all_entries_not_interesting)
 768                                 break;
 769                         if (match == entry_not_interesting)
 770                                 continue;
 771                 }
 772
 773                 strbuf_add(base, entry.path, te_len);
 774
 775                 if (S_ISREG(entry.mode)) {
 776                         hit |= grep_oid(opt, entry.oid, base->buf, tn_len,
 777                                          check_attr ? base->buf + tn_len : NULL);
 778                 } else if (S_ISDIR(entry.mode)) {
 779                         enum object_type type;
 780                         struct tree_desc sub;
 781                         void *data;
 782                         unsigned long size;
 783
 784                         data = lock_and_read_oid_file(entry.oid, &type, &size);
 785                         if (!data)
 786                                 die(_("unable to read tree (%s)"),
 787                                     oid_to_hex(entry.oid));
 788
 789                         strbuf_addch(base, '/');
 790                         init_tree_desc(&sub, data, size);
 791                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
 792                                          check_attr);
 793                         free(data);
 794                 } else if (recurse_submodules && S_ISGITLINK(entry.mode)) {
 795                         hit |= grep_submodule(opt, entry.oid, base->buf,
 796                                               base->buf + tn_len);
 797                 }
 798
 799                 strbuf_setlen(base, old_baselen);
 800
 801                 if (hit && opt->status_only)
 802                         break;
 803         }
 804
 805         strbuf_release(&name);
 806         return hit;
 807 }
 808
 809 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 810                        struct object *obj, const char *name, const char *path)
 811 {
 812         if (obj->type == OBJ_BLOB)
 813                 return grep_oid(opt, &obj->oid, name, 0, path);
 814         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 815                 struct tree_desc tree;
 816                 void *data;
 817                 unsigned long size;
 818                 struct strbuf base;
 819                 int hit, len;
 820
 821                 grep_read_lock();
 822                 data = read_object_with_reference(obj->oid.hash, tree_type,
 823                                                   &size, NULL);
 824                 grep_read_unlock();
 825
 826                 if (!data)
 827                         die(_("unable to read tree (%s)"), oid_to_hex(&obj->oid));
 828
 829                 /* Use parent's name as base when recursing submodules */
 830                 if (recurse_submodules && parent_basename)
 831                         name = parent_basename;
 832
 833                 len = name ? strlen(name) : 0;
 834                 strbuf_init(&base, PATH_MAX + len + 1);
 835                 if (len) {
 836                         strbuf_add(&base, name, len);
 837                         strbuf_addch(&base, ':');
 838                 }
 839                 init_tree_desc(&tree, data, size);
 840                 hit = grep_tree(opt, pathspec, &tree, &base, base.len,
 841                                 obj->type == OBJ_COMMIT);
 842                 strbuf_release(&base);
 843                 free(data);
 844                 return hit;
 845         }
 846         die(_("unable to grep from object of type %s"), typename(obj->type));
 847 }
 848
 849 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 850                         const struct object_array *list)
 851 {
 852         unsigned int i;
 853         int hit = 0;
 854         const unsigned int nr = list->nr;
 855
 856         for (i = 0; i < nr; i++) {
 857                 struct object *real_obj;
 858                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
 859
 860                 /* load the gitmodules file for this rev */
 861                 if (recurse_submodules) {
 862                         submodule_free();
 863                         gitmodules_config_sha1(real_obj->oid.hash);
 864                 }
 865                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name, list->objects[i].path)) {
 866                         hit = 1;
 867                         if (opt->status_only)
 868                                 break;
 869                 }
 870         }
 871         return hit;
 872 }
 873
 874 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
 875                           int exc_std, int use_index)
 876 {
 877         struct dir_struct dir;
 878         int i, hit = 0;
 879
 880         memset(&dir, 0, sizeof(dir));
 881         if (!use_index)
 882                 dir.flags |= DIR_NO_GITLINKS;
 883         if (exc_std)
 884                 setup_standard_excludes(&dir);
 885
 886         fill_directory(&dir, &the_index, pathspec);
 887         for (i = 0; i < dir.nr; i++) {
 888                 if (!dir_path_match(dir.entries[i], pathspec, 0, NULL))
 889                         continue;
 890                 hit |= grep_file(opt, dir.entries[i]->name);
 891                 if (hit && opt->status_only)
 892                         break;
 893         }
 894         return hit;
 895 }
 896
 897 static int context_callback(const struct option *opt, const char *arg,
 898                             int unset)
 899 {
 900         struct grep_opt *grep_opt = opt->value;
 901         int value;
 902         const char *endp;
 903
 904         if (unset) {
 905                 grep_opt->pre_context = grep_opt->post_context = 0;
 906                 return 0;
 907         }
 908         value = strtol(arg, (char **)&endp, 10);
 909         if (*endp) {
 910                 return error(_("switch `%c' expects a numerical value"),
 911                              opt->short_name);
 912         }
 913         grep_opt->pre_context = grep_opt->post_context = value;
 914         return 0;
 915 }
 916
 917 static int file_callback(const struct option *opt, const char *arg, int unset)
 918 {
 919         struct grep_opt *grep_opt = opt->value;
 920         int from_stdin = !strcmp(arg, "-");
 921         FILE *patterns;
 922         int lno = 0;
 923         struct strbuf sb = STRBUF_INIT;
 924
 925         patterns = from_stdin ? stdin : fopen(arg, "r");
 926         if (!patterns)
 927                 die_errno(_("cannot open '%s'"), arg);
 928         while (strbuf_getline(&sb, patterns) == 0) {
 929                 /* ignore empty line like grep does */
 930                 if (sb.len == 0)
 931                         continue;
 932
 933                 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
 934                                 GREP_PATTERN);
 935         }
 936         if (!from_stdin)
 937                 fclose(patterns);
 938         strbuf_release(&sb);
 939         return 0;
 940 }
 941
 942 static int not_callback(const struct option *opt, const char *arg, int unset)
 943 {
 944         struct grep_opt *grep_opt = opt->value;
 945         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 946         return 0;
 947 }
 948
 949 static int and_callback(const struct option *opt, const char *arg, int unset)
 950 {
 951         struct grep_opt *grep_opt = opt->value;
 952         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 953         return 0;
 954 }
 955
 956 static int open_callback(const struct option *opt, const char *arg, int unset)
 957 {
 958         struct grep_opt *grep_opt = opt->value;
 959         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 960         return 0;
 961 }
 962
 963 static int close_callback(const struct option *opt, const char *arg, int unset)
 964 {
 965         struct grep_opt *grep_opt = opt->value;
 966         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 967         return 0;
 968 }
 969
 970 static int pattern_callback(const struct option *opt, const char *arg,
 971                             int unset)
 972 {
 973         struct grep_opt *grep_opt = opt->value;
 974         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 975         return 0;
 976 }
 977
 978 int cmd_grep(int argc, const char **argv, const char *prefix)
 979 {
 980         int hit = 0;
 981         int cached = 0, untracked = 0, opt_exclude = -1;
 982         int seen_dashdash = 0;
 983         int external_grep_allowed__ignored;
 984         const char *show_in_pager = NULL, *default_pager = "dummy";
 985         struct grep_opt opt;
 986         struct object_array list = OBJECT_ARRAY_INIT;
 987         struct pathspec pathspec;
 988         struct string_list path_list = STRING_LIST_INIT_NODUP;
 989         int i;
 990         int dummy;
 991         int use_index = 1;
 992         int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 993         int allow_revs;
 994
 995         struct option options[] = {
 996                 OPT_BOOL(0, "cached", &cached,
 997                         N_("search in index instead of in the work tree")),
 998                 OPT_NEGBIT(0, "no-index", &use_index,
 999                          N_("find in contents not managed by git"), 1),
1000                 OPT_BOOL(0, "untracked", &untracked,
1001                         N_("search in both tracked and untracked files")),
1002                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
1003                             N_("ignore files specified via '.gitignore'"), 1),
1004                 OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
1005                          N_("recursively search in each submodule")),
1006                 OPT_STRING(0, "parent-basename", &parent_basename,
1007                            N_("basename"),
1008                            N_("prepend parent project's basename to output")),
1009                 OPT_GROUP(""),
1010                 OPT_BOOL('v', "invert-match", &opt.invert,
1011                         N_("show non-matching lines")),
1012                 OPT_BOOL('i', "ignore-case", &opt.ignore_case,
1013                         N_("case insensitive matching")),
1014                 OPT_BOOL('w', "word-regexp", &opt.word_regexp,
1015                         N_("match patterns only at word boundaries")),
1016                 OPT_SET_INT('a', "text", &opt.binary,
1017                         N_("process binary files as text"), GREP_BINARY_TEXT),
1018                 OPT_SET_INT('I', NULL, &opt.binary,
1019                         N_("don't match patterns in binary files"),
1020                         GREP_BINARY_NOMATCH),
1021                 OPT_BOOL(0, "textconv", &opt.allow_textconv,
1022                          N_("process binary files with textconv filters")),
1023                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
1024                         N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
1025                         NULL, 1 },
1026                 OPT_GROUP(""),
1027                 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
1028                             N_("use extended POSIX regular expressions"),
1029                             GREP_PATTERN_TYPE_ERE),
1030                 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
1031                             N_("use basic POSIX regular expressions (default)"),
1032                             GREP_PATTERN_TYPE_BRE),
1033                 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
1034                             N_("interpret patterns as fixed strings"),
1035                             GREP_PATTERN_TYPE_FIXED),
1036                 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
1037                             N_("use Perl-compatible regular expressions"),
1038                             GREP_PATTERN_TYPE_PCRE),
1039                 OPT_GROUP(""),
1040                 OPT_BOOL('n', "line-number", &opt.linenum, N_("show line numbers")),
1041                 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
1042                 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
1043                 OPT_NEGBIT(0, "full-name", &opt.relative,
1044                         N_("show filenames relative to top directory"), 1),
1045                 OPT_BOOL('l', "files-with-matches", &opt.name_only,
1046                         N_("show only filenames instead of matching lines")),
1047                 OPT_BOOL(0, "name-only", &opt.name_only,
1048                         N_("synonym for --files-with-matches")),
1049                 OPT_BOOL('L', "files-without-match",
1050                         &opt.unmatch_name_only,
1051                         N_("show only the names of files without match")),
1052                 OPT_BOOL('z', "null", &opt.null_following_name,
1053                         N_("print NUL after filenames")),
1054                 OPT_BOOL('c', "count", &opt.count,
1055                         N_("show the number of matches instead of matching lines")),
1056                 OPT__COLOR(&opt.color, N_("highlight matches")),
1057                 OPT_BOOL(0, "break", &opt.file_break,
1058                         N_("print empty line between matches from different files")),
1059                 OPT_BOOL(0, "heading", &opt.heading,
1060                         N_("show filename only once above matches from same file")),
1061                 OPT_GROUP(""),
1062                 OPT_CALLBACK('C', "context", &opt, N_("n"),
1063                         N_("show <n> context lines before and after matches"),
1064                         context_callback),
1065                 OPT_INTEGER('B', "before-context", &opt.pre_context,
1066                         N_("show <n> context lines before matches")),
1067                 OPT_INTEGER('A', "after-context", &opt.post_context,
1068                         N_("show <n> context lines after matches")),
1069                 OPT_INTEGER(0, "threads", &num_threads,
1070                         N_("use <n> worker threads")),
1071                 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
1072                         context_callback),
1073                 OPT_BOOL('p', "show-function", &opt.funcname,
1074                         N_("show a line with the function name before matches")),
1075                 OPT_BOOL('W', "function-context", &opt.funcbody,
1076                         N_("show the surrounding function")),
1077                 OPT_GROUP(""),
1078                 OPT_CALLBACK('f', NULL, &opt, N_("file"),
1079                         N_("read patterns from file"), file_callback),
1080                 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
1081                         N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
1082                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
1083                   N_("combine patterns specified with -e"),
1084                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
1085                 OPT_BOOL(0, "or", &dummy, ""),
1086                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
1087                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
1088                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
1089                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1090                   open_callback },
1091                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
1092                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1093                   close_callback },
1094                 OPT__QUIET(&opt.status_only,
1095                            N_("indicate hit with exit status without output")),
1096                 OPT_BOOL(0, "all-match", &opt.all_match,
1097                         N_("show only matches from files that match all patterns")),
1098                 { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
1099                   N_("show parse tree for grep expression"),
1100                   PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
1101                 OPT_GROUP(""),
1102                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
1103                         N_("pager"), N_("show matching files in the pager"),
1104                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
1105                 OPT_BOOL(0, "ext-grep", &external_grep_allowed__ignored,
1106                          N_("allow calling of grep(1) (ignored by this build)")),
1107                 OPT_END()
1108         };
1109
1110         init_grep_defaults();
1111         git_config(grep_cmd_config, NULL);
1112         grep_init(&opt, prefix);
1113         super_prefix = get_super_prefix();
1114
1115         /*
1116          * If there is no -- then the paths must exist in the working
1117          * tree.  If there is no explicit pattern specified with -e or
1118          * -f, we take the first unrecognized non option to be the
1119          * pattern, but then what follows it must be zero or more
1120          * valid refs up to the -- (if exists), and then existing
1121          * paths.  If there is an explicit pattern, then the first
1122          * unrecognized non option is the beginning of the refs list
1123          * that continues up to the -- (if exists), and then paths.
1124          */
1125         argc = parse_options(argc, argv, prefix, options, grep_usage,
1126                              PARSE_OPT_KEEP_DASHDASH |
1127                              PARSE_OPT_STOP_AT_NON_OPTION);
1128         grep_commit_pattern_type(pattern_type_arg, &opt);
1129
1130         if (use_index && !startup_info->have_repository) {
1131                 int fallback = 0;
1132                 git_config_get_bool("grep.fallbacktonoindex", &fallback);
1133                 if (fallback)
1134                         use_index = 0;
1135                 else
1136                         /* die the same way as if we did it at the beginning */
1137                         setup_git_directory();
1138         }
1139
1140         /*
1141          * skip a -- separator; we know it cannot be
1142          * separating revisions from pathnames if
1143          * we haven't even had any patterns yet
1144          */
1145         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
1146                 argv++;
1147                 argc--;
1148         }
1149
1150         /* First unrecognized non-option token */
1151         if (argc > 0 && !opt.pattern_list) {
1152                 append_grep_pattern(&opt, argv[0], "command line", 0,
1153                                     GREP_PATTERN);
1154                 argv++;
1155                 argc--;
1156         }
1157
1158         if (show_in_pager == default_pager)
1159                 show_in_pager = git_pager(1);
1160         if (show_in_pager) {
1161                 opt.color = 0;
1162                 opt.name_only = 1;
1163                 opt.null_following_name = 1;
1164                 opt.output_priv = &path_list;
1165                 opt.output = append_path;
1166                 string_list_append(&path_list, show_in_pager);
1167         }
1168
1169         if (!opt.pattern_list)
1170                 die(_("no pattern given."));
1171         if (!opt.fixed && opt.ignore_case)
1172                 opt.regflags |= REG_ICASE;
1173
1174         /*
1175          * We have to find "--" in a separate pass, because its presence
1176          * influences how we will parse arguments that come before it.
1177          */
1178         for (i = 0; i < argc; i++) {
1179                 if (!strcmp(argv[i], "--")) {
1180                         seen_dashdash = 1;
1181                         break;
1182                 }
1183         }
1184
1185         /*
1186          * Resolve any rev arguments. If we have a dashdash, then everything up
1187          * to it must resolve as a rev. If not, then we stop at the first
1188          * non-rev and assume everything else is a path.
1189          */
1190         allow_revs = use_index && !untracked;
1191         for (i = 0; i < argc; i++) {
1192                 const char *arg = argv[i];
1193                 struct object_id oid;
1194                 struct object_context oc;
1195                 struct object *object;
1196
1197                 if (!strcmp(arg, "--")) {
1198                         i++;
1199                         break;
1200                 }
1201
1202                 if (!allow_revs) {
1203                         if (seen_dashdash)
1204                                 die(_("--no-index or --untracked cannot be used with revs"));
1205                         break;
1206                 }
1207
1208                 if (get_sha1_with_context(arg, GET_SHA1_RECORD_PATH,
1209                                           oid.hash, &oc)) {
1210                         if (seen_dashdash)
1211                                 die(_("unable to resolve revision: %s"), arg);
1212                         break;
1213                 }
1214
1215                 object = parse_object_or_die(&oid, arg);
1216                 if (!seen_dashdash)
1217                         verify_non_filename(prefix, arg);
1218                 add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
1219                 free(oc.path);
1220         }
1221
1222         /*
1223          * Anything left over is presumed to be a path. But in the non-dashdash
1224          * "do what I mean" case, we verify and complain when that isn't true.
1225          */
1226         if (!seen_dashdash) {
1227                 int j;
1228                 for (j = i; j < argc; j++)
1229                         verify_filename(prefix, argv[j], j == i && allow_revs);
1230         }
1231
1232         parse_pathspec(&pathspec, 0,
1233                        PATHSPEC_PREFER_CWD |
1234                        (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
1235                        prefix, argv + i);
1236         pathspec.max_depth = opt.max_depth;
1237         pathspec.recursive = 1;
1238
1239 #ifndef NO_PTHREADS
1240         if (list.nr || cached || show_in_pager)
1241                 num_threads = 0;
1242         else if (num_threads == 0)
1243                 num_threads = GREP_NUM_THREADS_DEFAULT;
1244         else if (num_threads < 0)
1245                 die(_("invalid number of threads specified (%d)"), num_threads);
1246         if (num_threads == 1)
1247                 num_threads = 0;
1248 #else
1249         if (num_threads)
1250                 warning(_("no threads support, ignoring --threads"));
1251         num_threads = 0;
1252 #endif
1253
1254         if (!num_threads)
1255                 /*
1256                  * The compiled patterns on the main path are only
1257                  * used when not using threading. Otherwise
1258                  * start_threads() below calls compile_grep_patterns()
1259                  * for each thread.
1260                  */
1261                 compile_grep_patterns(&opt);
1262
1263 #ifndef NO_PTHREADS
1264         if (num_threads) {
1265                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
1266                     && (opt.pre_context || opt.post_context ||
1267                         opt.file_break || opt.funcbody))
1268                         skip_first_line = 1;
1269                 start_threads(&opt);
1270         }
1271 #endif
1272
1273         if (recurse_submodules) {
1274                 gitmodules_config();
1275                 compile_submodule_options(&opt, argv + i, cached, untracked,
1276                                           opt_exclude, use_index,
1277                                           pattern_type_arg);
1278         }
1279
1280         if (show_in_pager && (cached || list.nr))
1281                 die(_("--open-files-in-pager only works on the worktree"));
1282
1283         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1284                 const char *pager = path_list.items[0].string;
1285                 int len = strlen(pager);
1286
1287                 if (len > 4 && is_dir_sep(pager[len - 5]))
1288                         pager += len - 4;
1289
1290                 if (opt.ignore_case && !strcmp("less", pager))
1291                         string_list_append(&path_list, "-I");
1292
1293                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1294                         struct strbuf buf = STRBUF_INIT;
1295                         strbuf_addf(&buf, "+/%s%s",
1296                                         strcmp("less", pager) ? "" : "*",
1297                                         opt.pattern_list->pattern);
1298                         string_list_append(&path_list, buf.buf);
1299                         strbuf_detach(&buf, NULL);
1300                 }
1301         }
1302
1303         if (recurse_submodules && (!use_index || untracked))
1304                 die(_("option not supported with --recurse-submodules."));
1305
1306         if (!show_in_pager && !opt.status_only)
1307                 setup_pager();
1308
1309         if (!use_index && (untracked || cached))
1310                 die(_("--cached or --untracked cannot be used with --no-index."));
1311
1312         if (!use_index || untracked) {
1313                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1314                 hit = grep_directory(&opt, &pathspec, use_exclude, use_index);
1315         } else if (0 <= opt_exclude) {
1316                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1317         } else if (!list.nr) {
1318                 if (!cached)
1319                         setup_work_tree();
1320
1321                 hit = grep_cache(&opt, &pathspec, cached);
1322         } else {
1323                 if (cached)
1324                         die(_("both --cached and trees are given."));
1325                 hit = grep_objects(&opt, &pathspec, &list);
1326         }
1327
1328         if (num_threads)
1329                 hit |= wait_all();
1330         if (hit && show_in_pager)
1331                 run_pager(&opt, prefix);
1332         clear_pathspec(&pathspec);
1333         free_grep_patterns(&opt);
1334         return !hit;
1335 }