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         if (num_threads)
  77                 pthread_mutex_lock(&grep_mutex);
  78 }
  79
  80 static inline void grep_unlock(void)
  81 {
  82         if (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                 o->debug = 0;
 228                 compile_grep_patterns(o);
 229                 err = pthread_create(&threads[i], NULL, run, o);
 230
 231                 if (err)
 232                         die(_("grep: failed to create thread: %s"),
 233                             strerror(err));
 234         }
 235 }
 236
 237 static int wait_all(void)
 238 {
 239         int hit = 0;
 240         int i;
 241
 242         grep_lock();
 243         all_work_added = 1;
 244
 245         /* Wait until all work is done. */
 246         while (todo_done != todo_end)
 247                 pthread_cond_wait(&cond_result, &grep_mutex);
 248
 249         /* Wake up all the consumer threads so they can see that there
 250          * is no more work to do.
 251          */
 252         pthread_cond_broadcast(&cond_add);
 253         grep_unlock();
 254
 255         for (i = 0; i < num_threads; i++) {
 256                 void *h;
 257                 pthread_join(threads[i], &h);
 258                 hit |= (int) (intptr_t) h;
 259         }
 260
 261         free(threads);
 262
 263         pthread_mutex_destroy(&grep_mutex);
 264         pthread_mutex_destroy(&grep_read_mutex);
 265         pthread_mutex_destroy(&grep_attr_mutex);
 266         pthread_cond_destroy(&cond_add);
 267         pthread_cond_destroy(&cond_write);
 268         pthread_cond_destroy(&cond_result);
 269         grep_use_locks = 0;
 270
 271         return hit;
 272 }
 273 #else /* !NO_PTHREADS */
 274
 275 static int wait_all(void)
 276 {
 277         return 0;
 278 }
 279 #endif
 280
 281 static int grep_cmd_config(const char *var, const char *value, void *cb)
 282 {
 283         int st = grep_config(var, value, cb);
 284         if (git_color_default_config(var, value, cb) < 0)
 285                 st = -1;
 286
 287         if (!strcmp(var, "grep.threads")) {
 288                 num_threads = git_config_int(var, value);
 289                 if (num_threads < 0)
 290                         die(_("invalid number of threads specified (%d) for %s"),
 291                             num_threads, var);
 292         }
 293
 294         return st;
 295 }
 296
 297 static void *lock_and_read_oid_file(const struct object_id *oid, enum object_type *type, unsigned long *size)
 298 {
 299         void *data;
 300
 301         grep_read_lock();
 302         data = read_sha1_file(oid->hash, type, size);
 303         grep_read_unlock();
 304         return data;
 305 }
 306
 307 static int grep_oid(struct grep_opt *opt, const struct object_id *oid,
 308                      const char *filename, int tree_name_len,
 309                      const char *path)
 310 {
 311         struct strbuf pathbuf = STRBUF_INIT;
 312
 313         if (super_prefix) {
 314                 strbuf_add(&pathbuf, filename, tree_name_len);
 315                 strbuf_addstr(&pathbuf, super_prefix);
 316                 strbuf_addstr(&pathbuf, filename + tree_name_len);
 317         } else {
 318                 strbuf_addstr(&pathbuf, filename);
 319         }
 320
 321         if (opt->relative && opt->prefix_length) {
 322                 char *name = strbuf_detach(&pathbuf, NULL);
 323                 quote_path_relative(name + tree_name_len, opt->prefix, &pathbuf);
 324                 strbuf_insert(&pathbuf, 0, name, tree_name_len);
 325                 free(name);
 326         }
 327
 328 #ifndef NO_PTHREADS
 329         if (num_threads) {
 330                 add_work(opt, GREP_SOURCE_SHA1, pathbuf.buf, path, oid);
 331                 strbuf_release(&pathbuf);
 332                 return 0;
 333         } else
 334 #endif
 335         {
 336                 struct grep_source gs;
 337                 int hit;
 338
 339                 grep_source_init(&gs, GREP_SOURCE_SHA1, pathbuf.buf, path, oid);
 340                 strbuf_release(&pathbuf);
 341                 hit = grep_source(opt, &gs);
 342
 343                 grep_source_clear(&gs);
 344                 return hit;
 345         }
 346 }
 347
 348 static int grep_file(struct grep_opt *opt, const char *filename)
 349 {
 350         struct strbuf buf = STRBUF_INIT;
 351
 352         if (super_prefix)
 353                 strbuf_addstr(&buf, super_prefix);
 354         strbuf_addstr(&buf, filename);
 355
 356         if (opt->relative && opt->prefix_length) {
 357                 char *name = strbuf_detach(&buf, NULL);
 358                 quote_path_relative(name, opt->prefix, &buf);
 359                 free(name);
 360         }
 361
 362 #ifndef NO_PTHREADS
 363         if (num_threads) {
 364                 add_work(opt, GREP_SOURCE_FILE, buf.buf, filename, filename);
 365                 strbuf_release(&buf);
 366                 return 0;
 367         } else
 368 #endif
 369         {
 370                 struct grep_source gs;
 371                 int hit;
 372
 373                 grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename, filename);
 374                 strbuf_release(&buf);
 375                 hit = grep_source(opt, &gs);
 376
 377                 grep_source_clear(&gs);
 378                 return hit;
 379         }
 380 }
 381
 382 static void append_path(struct grep_opt *opt, const void *data, size_t len)
 383 {
 384         struct string_list *path_list = opt->output_priv;
 385
 386         if (len == 1 && *(const char *)data == '\0')
 387                 return;
 388         string_list_append(path_list, xstrndup(data, len));
 389 }
 390
 391 static void run_pager(struct grep_opt *opt, const char *prefix)
 392 {
 393         struct string_list *path_list = opt->output_priv;
 394         struct child_process child = CHILD_PROCESS_INIT;
 395         int i, status;
 396
 397         for (i = 0; i < path_list->nr; i++)
 398                 argv_array_push(&child.args, path_list->items[i].string);
 399         child.dir = prefix;
 400         child.use_shell = 1;
 401
 402         status = run_command(&child);
 403         if (status)
 404                 exit(status);
 405 }
 406
 407 static void compile_submodule_options(const struct grep_opt *opt,
 408                                       const char **argv,
 409                                       int cached, int untracked,
 410                                       int opt_exclude, int use_index,
 411                                       int pattern_type_arg)
 412 {
 413         struct grep_pat *pattern;
 414
 415         if (recurse_submodules)
 416                 argv_array_push(&submodule_options, "--recurse-submodules");
 417
 418         if (cached)
 419                 argv_array_push(&submodule_options, "--cached");
 420         if (!use_index)
 421                 argv_array_push(&submodule_options, "--no-index");
 422         if (untracked)
 423                 argv_array_push(&submodule_options, "--untracked");
 424         if (opt_exclude > 0)
 425                 argv_array_push(&submodule_options, "--exclude-standard");
 426
 427         if (opt->invert)
 428                 argv_array_push(&submodule_options, "-v");
 429         if (opt->ignore_case)
 430                 argv_array_push(&submodule_options, "-i");
 431         if (opt->word_regexp)
 432                 argv_array_push(&submodule_options, "-w");
 433         switch (opt->binary) {
 434         case GREP_BINARY_NOMATCH:
 435                 argv_array_push(&submodule_options, "-I");
 436                 break;
 437         case GREP_BINARY_TEXT:
 438                 argv_array_push(&submodule_options, "-a");
 439                 break;
 440         default:
 441                 break;
 442         }
 443         if (opt->allow_textconv)
 444                 argv_array_push(&submodule_options, "--textconv");
 445         if (opt->max_depth != -1)
 446                 argv_array_pushf(&submodule_options, "--max-depth=%d",
 447                                  opt->max_depth);
 448         if (opt->linenum)
 449                 argv_array_push(&submodule_options, "-n");
 450         if (!opt->pathname)
 451                 argv_array_push(&submodule_options, "-h");
 452         if (!opt->relative)
 453                 argv_array_push(&submodule_options, "--full-name");
 454         if (opt->name_only)
 455                 argv_array_push(&submodule_options, "-l");
 456         if (opt->unmatch_name_only)
 457                 argv_array_push(&submodule_options, "-L");
 458         if (opt->null_following_name)
 459                 argv_array_push(&submodule_options, "-z");
 460         if (opt->count)
 461                 argv_array_push(&submodule_options, "-c");
 462         if (opt->file_break)
 463                 argv_array_push(&submodule_options, "--break");
 464         if (opt->heading)
 465                 argv_array_push(&submodule_options, "--heading");
 466         if (opt->pre_context)
 467                 argv_array_pushf(&submodule_options, "--before-context=%d",
 468                                  opt->pre_context);
 469         if (opt->post_context)
 470                 argv_array_pushf(&submodule_options, "--after-context=%d",
 471                                  opt->post_context);
 472         if (opt->funcname)
 473                 argv_array_push(&submodule_options, "-p");
 474         if (opt->funcbody)
 475                 argv_array_push(&submodule_options, "-W");
 476         if (opt->all_match)
 477                 argv_array_push(&submodule_options, "--all-match");
 478         if (opt->debug)
 479                 argv_array_push(&submodule_options, "--debug");
 480         if (opt->status_only)
 481                 argv_array_push(&submodule_options, "-q");
 482
 483         switch (pattern_type_arg) {
 484         case GREP_PATTERN_TYPE_BRE:
 485                 argv_array_push(&submodule_options, "-G");
 486                 break;
 487         case GREP_PATTERN_TYPE_ERE:
 488                 argv_array_push(&submodule_options, "-E");
 489                 break;
 490         case GREP_PATTERN_TYPE_FIXED:
 491                 argv_array_push(&submodule_options, "-F");
 492                 break;
 493         case GREP_PATTERN_TYPE_PCRE:
 494                 argv_array_push(&submodule_options, "-P");
 495                 break;
 496         case GREP_PATTERN_TYPE_UNSPECIFIED:
 497                 break;
 498         }
 499
 500         for (pattern = opt->pattern_list; pattern != NULL;
 501              pattern = pattern->next) {
 502                 switch (pattern->token) {
 503                 case GREP_PATTERN:
 504                         argv_array_pushf(&submodule_options, "-e%s",
 505                                          pattern->pattern);
 506                         break;
 507                 case GREP_AND:
 508                 case GREP_OPEN_PAREN:
 509                 case GREP_CLOSE_PAREN:
 510                 case GREP_NOT:
 511                 case GREP_OR:
 512                         argv_array_push(&submodule_options, pattern->pattern);
 513                         break;
 514                 /* BODY and HEAD are not used by git-grep */
 515                 case GREP_PATTERN_BODY:
 516                 case GREP_PATTERN_HEAD:
 517                         break;
 518                 }
 519         }
 520
 521         /*
 522          * Limit number of threads for child process to use.
 523          * This is to prevent potential fork-bomb behavior of git-grep as each
 524          * submodule process has its own thread pool.
 525          */
 526         argv_array_pushf(&submodule_options, "--threads=%d",
 527                          (num_threads + 1) / 2);
 528
 529         /* Add Pathspecs */
 530         argv_array_push(&submodule_options, "--");
 531         for (; *argv; argv++)
 532                 argv_array_push(&submodule_options, *argv);
 533 }
 534
 535 /*
 536  * Launch child process to grep contents of a submodule
 537  */
 538 static int grep_submodule_launch(struct grep_opt *opt,
 539                                  const struct grep_source *gs)
 540 {
 541         struct child_process cp = CHILD_PROCESS_INIT;
 542         int status, i;
 543         const char *end_of_base;
 544         const char *name;
 545         struct strbuf child_output = STRBUF_INIT;
 546
 547         end_of_base = strchr(gs->name, ':');
 548         if (gs->identifier && end_of_base)
 549                 name = end_of_base + 1;
 550         else
 551                 name = gs->name;
 552
 553         prepare_submodule_repo_env(&cp.env_array);
 554         argv_array_push(&cp.env_array, GIT_DIR_ENVIRONMENT);
 555
 556         if (opt->relative && opt->prefix_length)
 557                 argv_array_pushf(&cp.env_array, "%s=%s",
 558                                  GIT_TOPLEVEL_PREFIX_ENVIRONMENT,
 559                                  opt->prefix);
 560
 561         /* Add super prefix */
 562         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
 563                          super_prefix ? super_prefix : "",
 564                          name);
 565         argv_array_push(&cp.args, "grep");
 566
 567         /*
 568          * Add basename of parent project
 569          * When performing grep on a tree object the filename is prefixed
 570          * with the object's name: 'tree-name:filename'.  In order to
 571          * provide uniformity of output we want to pass the name of the
 572          * parent project's object name to the submodule so the submodule can
 573          * prefix its output with the parent's name and not its own SHA1.
 574          */
 575         if (gs->identifier && end_of_base)
 576                 argv_array_pushf(&cp.args, "--parent-basename=%.*s",
 577                                  (int) (end_of_base - gs->name),
 578                                  gs->name);
 579
 580         /* Add options */
 581         for (i = 0; i < submodule_options.argc; i++) {
 582                 /*
 583                  * If there is a tree identifier for the submodule, add the
 584                  * rev after adding the submodule options but before the
 585                  * pathspecs.  To do this we listen for the '--' and insert the
 586                  * sha1 before pushing the '--' onto the child process argv
 587                  * array.
 588                  */
 589                 if (gs->identifier &&
 590                     !strcmp("--", submodule_options.argv[i])) {
 591                         argv_array_push(&cp.args, sha1_to_hex(gs->identifier));
 592                 }
 593
 594                 argv_array_push(&cp.args, submodule_options.argv[i]);
 595         }
 596
 597         cp.git_cmd = 1;
 598         cp.dir = gs->path;
 599
 600         /*
 601          * Capture output to output buffer and check the return code from the
 602          * child process.  A '0' indicates a hit, a '1' indicates no hit and
 603          * anything else is an error.
 604          */
 605         status = capture_command(&cp, &child_output, 0);
 606         if (status && (status != 1)) {
 607                 /* flush the buffer */
 608                 write_or_die(1, child_output.buf, child_output.len);
 609                 die("process for submodule '%s' failed with exit code: %d",
 610                     gs->name, status);
 611         }
 612
 613         opt->output(opt, child_output.buf, child_output.len);
 614         strbuf_release(&child_output);
 615         /* invert the return code to make a hit equal to 1 */
 616         return !status;
 617 }
 618
 619 /*
 620  * Prep grep structures for a submodule grep
 621  * sha1: the sha1 of the submodule or NULL if using the working tree
 622  * filename: name of the submodule including tree name of parent
 623  * path: location of the submodule
 624  */
 625 static int grep_submodule(struct grep_opt *opt, const unsigned char *sha1,
 626                           const char *filename, const char *path)
 627 {
 628         if (!is_submodule_initialized(path))
 629                 return 0;
 630         if (!is_submodule_populated_gently(path, NULL)) {
 631                 /*
 632                  * If searching history, check for the presense of the
 633                  * submodule's gitdir before skipping the submodule.
 634                  */
 635                 if (sha1) {
 636                         const struct submodule *sub =
 637                                         submodule_from_path(null_sha1, path);
 638                         if (sub)
 639                                 path = git_path("modules/%s", sub->name);
 640
 641                         if (!(is_directory(path) && is_git_directory(path)))
 642                                 return 0;
 643                 } else {
 644                         return 0;
 645                 }
 646         }
 647
 648 #ifndef NO_PTHREADS
 649         if (num_threads) {
 650                 add_work(opt, GREP_SOURCE_SUBMODULE, filename, path, sha1);
 651                 return 0;
 652         } else
 653 #endif
 654         {
 655                 struct grep_source gs;
 656                 int hit;
 657
 658                 grep_source_init(&gs, GREP_SOURCE_SUBMODULE,
 659                                  filename, path, sha1);
 660                 hit = grep_submodule_launch(opt, &gs);
 661
 662                 grep_source_clear(&gs);
 663                 return hit;
 664         }
 665 }
 666
 667 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec,
 668                       int cached)
 669 {
 670         int hit = 0;
 671         int nr;
 672         struct strbuf name = STRBUF_INIT;
 673         int name_base_len = 0;
 674         if (super_prefix) {
 675                 name_base_len = strlen(super_prefix);
 676                 strbuf_addstr(&name, super_prefix);
 677         }
 678
 679         read_cache();
 680
 681         for (nr = 0; nr < active_nr; nr++) {
 682                 const struct cache_entry *ce = active_cache[nr];
 683                 strbuf_setlen(&name, name_base_len);
 684                 strbuf_addstr(&name, ce->name);
 685
 686                 if (S_ISREG(ce->ce_mode) &&
 687                     match_pathspec(pathspec, name.buf, name.len, 0, NULL,
 688                                    S_ISDIR(ce->ce_mode) ||
 689                                    S_ISGITLINK(ce->ce_mode))) {
 690                         /*
 691                          * If CE_VALID is on, we assume worktree file and its
 692                          * cache entry are identical, even if worktree file has
 693                          * been modified, so use cache version instead
 694                          */
 695                         if (cached || (ce->ce_flags & CE_VALID) ||
 696                             ce_skip_worktree(ce)) {
 697                                 if (ce_stage(ce) || ce_intent_to_add(ce))
 698                                         continue;
 699                                 hit |= grep_oid(opt, &ce->oid, ce->name,
 700                                                  0, ce->name);
 701                         } else {
 702                                 hit |= grep_file(opt, ce->name);
 703                         }
 704                 } else if (recurse_submodules && S_ISGITLINK(ce->ce_mode) &&
 705                            submodule_path_match(pathspec, name.buf, NULL)) {
 706                         hit |= grep_submodule(opt, NULL, ce->name, ce->name);
 707                 } else {
 708                         continue;
 709                 }
 710
 711                 if (ce_stage(ce)) {
 712                         do {
 713                                 nr++;
 714                         } while (nr < active_nr &&
 715                                  !strcmp(ce->name, active_cache[nr]->name));
 716                         nr--; /* compensate for loop control */
 717                 }
 718                 if (hit && opt->status_only)
 719                         break;
 720         }
 721
 722         strbuf_release(&name);
 723         return hit;
 724 }
 725
 726 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 727                      struct tree_desc *tree, struct strbuf *base, int tn_len,
 728                      int check_attr)
 729 {
 730         int hit = 0;
 731         enum interesting match = entry_not_interesting;
 732         struct name_entry entry;
 733         int old_baselen = base->len;
 734         struct strbuf name = STRBUF_INIT;
 735         int name_base_len = 0;
 736         if (super_prefix) {
 737                 strbuf_addstr(&name, super_prefix);
 738                 name_base_len = name.len;
 739         }
 740
 741         while (tree_entry(tree, &entry)) {
 742                 int te_len = tree_entry_len(&entry);
 743
 744                 if (match != all_entries_interesting) {
 745                         strbuf_addstr(&name, base->buf + tn_len);
 746                         match = tree_entry_interesting(&entry, &name,
 747                                                        0, pathspec);
 748                         strbuf_setlen(&name, name_base_len);
 749
 750                         if (match == all_entries_not_interesting)
 751                                 break;
 752                         if (match == entry_not_interesting)
 753                                 continue;
 754                 }
 755
 756                 strbuf_add(base, entry.path, te_len);
 757
 758                 if (S_ISREG(entry.mode)) {
 759                         hit |= grep_oid(opt, entry.oid, base->buf, tn_len,
 760                                          check_attr ? base->buf + tn_len : NULL);
 761                 } else if (S_ISDIR(entry.mode)) {
 762                         enum object_type type;
 763                         struct tree_desc sub;
 764                         void *data;
 765                         unsigned long size;
 766
 767                         data = lock_and_read_oid_file(entry.oid, &type, &size);
 768                         if (!data)
 769                                 die(_("unable to read tree (%s)"),
 770                                     oid_to_hex(entry.oid));
 771
 772                         strbuf_addch(base, '/');
 773                         init_tree_desc(&sub, data, size);
 774                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
 775                                          check_attr);
 776                         free(data);
 777                 } else if (recurse_submodules && S_ISGITLINK(entry.mode)) {
 778                         hit |= grep_submodule(opt, entry.oid->hash, base->buf,
 779                                               base->buf + tn_len);
 780                 }
 781
 782                 strbuf_setlen(base, old_baselen);
 783
 784                 if (hit && opt->status_only)
 785                         break;
 786         }
 787
 788         strbuf_release(&name);
 789         return hit;
 790 }
 791
 792 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 793                        struct object *obj, const char *name, const char *path)
 794 {
 795         if (obj->type == OBJ_BLOB)
 796                 return grep_oid(opt, &obj->oid, name, 0, path);
 797         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 798                 struct tree_desc tree;
 799                 void *data;
 800                 unsigned long size;
 801                 struct strbuf base;
 802                 int hit, len;
 803
 804                 grep_read_lock();
 805                 data = read_object_with_reference(obj->oid.hash, tree_type,
 806                                                   &size, NULL);
 807                 grep_read_unlock();
 808
 809                 if (!data)
 810                         die(_("unable to read tree (%s)"), oid_to_hex(&obj->oid));
 811
 812                 /* Use parent's name as base when recursing submodules */
 813                 if (recurse_submodules && parent_basename)
 814                         name = parent_basename;
 815
 816                 len = name ? strlen(name) : 0;
 817                 strbuf_init(&base, PATH_MAX + len + 1);
 818                 if (len) {
 819                         strbuf_add(&base, name, len);
 820                         strbuf_addch(&base, ':');
 821                 }
 822                 init_tree_desc(&tree, data, size);
 823                 hit = grep_tree(opt, pathspec, &tree, &base, base.len,
 824                                 obj->type == OBJ_COMMIT);
 825                 strbuf_release(&base);
 826                 free(data);
 827                 return hit;
 828         }
 829         die(_("unable to grep from object of type %s"), typename(obj->type));
 830 }
 831
 832 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 833                         const struct object_array *list)
 834 {
 835         unsigned int i;
 836         int hit = 0;
 837         const unsigned int nr = list->nr;
 838
 839         for (i = 0; i < nr; i++) {
 840                 struct object *real_obj;
 841                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
 842
 843                 /* load the gitmodules file for this rev */
 844                 if (recurse_submodules) {
 845                         submodule_free();
 846                         gitmodules_config_sha1(real_obj->oid.hash);
 847                 }
 848                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name, list->objects[i].path)) {
 849                         hit = 1;
 850                         if (opt->status_only)
 851                                 break;
 852                 }
 853         }
 854         return hit;
 855 }
 856
 857 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
 858                           int exc_std, int use_index)
 859 {
 860         struct dir_struct dir;
 861         int i, hit = 0;
 862
 863         memset(&dir, 0, sizeof(dir));
 864         if (!use_index)
 865                 dir.flags |= DIR_NO_GITLINKS;
 866         if (exc_std)
 867                 setup_standard_excludes(&dir);
 868
 869         fill_directory(&dir, pathspec);
 870         for (i = 0; i < dir.nr; i++) {
 871                 if (!dir_path_match(dir.entries[i], pathspec, 0, NULL))
 872                         continue;
 873                 hit |= grep_file(opt, dir.entries[i]->name);
 874                 if (hit && opt->status_only)
 875                         break;
 876         }
 877         return hit;
 878 }
 879
 880 static int context_callback(const struct option *opt, const char *arg,
 881                             int unset)
 882 {
 883         struct grep_opt *grep_opt = opt->value;
 884         int value;
 885         const char *endp;
 886
 887         if (unset) {
 888                 grep_opt->pre_context = grep_opt->post_context = 0;
 889                 return 0;
 890         }
 891         value = strtol(arg, (char **)&endp, 10);
 892         if (*endp) {
 893                 return error(_("switch `%c' expects a numerical value"),
 894                              opt->short_name);
 895         }
 896         grep_opt->pre_context = grep_opt->post_context = value;
 897         return 0;
 898 }
 899
 900 static int file_callback(const struct option *opt, const char *arg, int unset)
 901 {
 902         struct grep_opt *grep_opt = opt->value;
 903         int from_stdin = !strcmp(arg, "-");
 904         FILE *patterns;
 905         int lno = 0;
 906         struct strbuf sb = STRBUF_INIT;
 907
 908         patterns = from_stdin ? stdin : fopen(arg, "r");
 909         if (!patterns)
 910                 die_errno(_("cannot open '%s'"), arg);
 911         while (strbuf_getline(&sb, patterns) == 0) {
 912                 /* ignore empty line like grep does */
 913                 if (sb.len == 0)
 914                         continue;
 915
 916                 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
 917                                 GREP_PATTERN);
 918         }
 919         if (!from_stdin)
 920                 fclose(patterns);
 921         strbuf_release(&sb);
 922         return 0;
 923 }
 924
 925 static int not_callback(const struct option *opt, const char *arg, int unset)
 926 {
 927         struct grep_opt *grep_opt = opt->value;
 928         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 929         return 0;
 930 }
 931
 932 static int and_callback(const struct option *opt, const char *arg, int unset)
 933 {
 934         struct grep_opt *grep_opt = opt->value;
 935         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 936         return 0;
 937 }
 938
 939 static int open_callback(const struct option *opt, const char *arg, int unset)
 940 {
 941         struct grep_opt *grep_opt = opt->value;
 942         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 943         return 0;
 944 }
 945
 946 static int close_callback(const struct option *opt, const char *arg, int unset)
 947 {
 948         struct grep_opt *grep_opt = opt->value;
 949         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 950         return 0;
 951 }
 952
 953 static int pattern_callback(const struct option *opt, const char *arg,
 954                             int unset)
 955 {
 956         struct grep_opt *grep_opt = opt->value;
 957         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 958         return 0;
 959 }
 960
 961 int cmd_grep(int argc, const char **argv, const char *prefix)
 962 {
 963         int hit = 0;
 964         int cached = 0, untracked = 0, opt_exclude = -1;
 965         int seen_dashdash = 0;
 966         int external_grep_allowed__ignored;
 967         const char *show_in_pager = NULL, *default_pager = "dummy";
 968         struct grep_opt opt;
 969         struct object_array list = OBJECT_ARRAY_INIT;
 970         struct pathspec pathspec;
 971         struct string_list path_list = STRING_LIST_INIT_NODUP;
 972         int i;
 973         int dummy;
 974         int use_index = 1;
 975         int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 976         int allow_revs;
 977
 978         struct option options[] = {
 979                 OPT_BOOL(0, "cached", &cached,
 980                         N_("search in index instead of in the work tree")),
 981                 OPT_NEGBIT(0, "no-index", &use_index,
 982                          N_("find in contents not managed by git"), 1),
 983                 OPT_BOOL(0, "untracked", &untracked,
 984                         N_("search in both tracked and untracked files")),
 985                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
 986                             N_("ignore files specified via '.gitignore'"), 1),
 987                 OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
 988                          N_("recursively search in each submodule")),
 989                 OPT_STRING(0, "parent-basename", &parent_basename,
 990                            N_("basename"),
 991                            N_("prepend parent project's basename to output")),
 992                 OPT_GROUP(""),
 993                 OPT_BOOL('v', "invert-match", &opt.invert,
 994                         N_("show non-matching lines")),
 995                 OPT_BOOL('i', "ignore-case", &opt.ignore_case,
 996                         N_("case insensitive matching")),
 997                 OPT_BOOL('w', "word-regexp", &opt.word_regexp,
 998                         N_("match patterns only at word boundaries")),
 999                 OPT_SET_INT('a', "text", &opt.binary,
1000                         N_("process binary files as text"), GREP_BINARY_TEXT),
1001                 OPT_SET_INT('I', NULL, &opt.binary,
1002                         N_("don't match patterns in binary files"),
1003                         GREP_BINARY_NOMATCH),
1004                 OPT_BOOL(0, "textconv", &opt.allow_textconv,
1005                          N_("process binary files with textconv filters")),
1006                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
1007                         N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
1008                         NULL, 1 },
1009                 OPT_GROUP(""),
1010                 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
1011                             N_("use extended POSIX regular expressions"),
1012                             GREP_PATTERN_TYPE_ERE),
1013                 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
1014                             N_("use basic POSIX regular expressions (default)"),
1015                             GREP_PATTERN_TYPE_BRE),
1016                 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
1017                             N_("interpret patterns as fixed strings"),
1018                             GREP_PATTERN_TYPE_FIXED),
1019                 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
1020                             N_("use Perl-compatible regular expressions"),
1021                             GREP_PATTERN_TYPE_PCRE),
1022                 OPT_GROUP(""),
1023                 OPT_BOOL('n', "line-number", &opt.linenum, N_("show line numbers")),
1024                 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
1025                 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
1026                 OPT_NEGBIT(0, "full-name", &opt.relative,
1027                         N_("show filenames relative to top directory"), 1),
1028                 OPT_BOOL('l', "files-with-matches", &opt.name_only,
1029                         N_("show only filenames instead of matching lines")),
1030                 OPT_BOOL(0, "name-only", &opt.name_only,
1031                         N_("synonym for --files-with-matches")),
1032                 OPT_BOOL('L', "files-without-match",
1033                         &opt.unmatch_name_only,
1034                         N_("show only the names of files without match")),
1035                 OPT_BOOL('z', "null", &opt.null_following_name,
1036                         N_("print NUL after filenames")),
1037                 OPT_BOOL('c', "count", &opt.count,
1038                         N_("show the number of matches instead of matching lines")),
1039                 OPT__COLOR(&opt.color, N_("highlight matches")),
1040                 OPT_BOOL(0, "break", &opt.file_break,
1041                         N_("print empty line between matches from different files")),
1042                 OPT_BOOL(0, "heading", &opt.heading,
1043                         N_("show filename only once above matches from same file")),
1044                 OPT_GROUP(""),
1045                 OPT_CALLBACK('C', "context", &opt, N_("n"),
1046                         N_("show <n> context lines before and after matches"),
1047                         context_callback),
1048                 OPT_INTEGER('B', "before-context", &opt.pre_context,
1049                         N_("show <n> context lines before matches")),
1050                 OPT_INTEGER('A', "after-context", &opt.post_context,
1051                         N_("show <n> context lines after matches")),
1052                 OPT_INTEGER(0, "threads", &num_threads,
1053                         N_("use <n> worker threads")),
1054                 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
1055                         context_callback),
1056                 OPT_BOOL('p', "show-function", &opt.funcname,
1057                         N_("show a line with the function name before matches")),
1058                 OPT_BOOL('W', "function-context", &opt.funcbody,
1059                         N_("show the surrounding function")),
1060                 OPT_GROUP(""),
1061                 OPT_CALLBACK('f', NULL, &opt, N_("file"),
1062                         N_("read patterns from file"), file_callback),
1063                 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
1064                         N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
1065                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
1066                   N_("combine patterns specified with -e"),
1067                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
1068                 OPT_BOOL(0, "or", &dummy, ""),
1069                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
1070                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
1071                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
1072                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1073                   open_callback },
1074                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
1075                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1076                   close_callback },
1077                 OPT__QUIET(&opt.status_only,
1078                            N_("indicate hit with exit status without output")),
1079                 OPT_BOOL(0, "all-match", &opt.all_match,
1080                         N_("show only matches from files that match all patterns")),
1081                 { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
1082                   N_("show parse tree for grep expression"),
1083                   PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
1084                 OPT_GROUP(""),
1085                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
1086                         N_("pager"), N_("show matching files in the pager"),
1087                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
1088                 OPT_BOOL(0, "ext-grep", &external_grep_allowed__ignored,
1089                          N_("allow calling of grep(1) (ignored by this build)")),
1090                 OPT_END()
1091         };
1092
1093         init_grep_defaults();
1094         git_config(grep_cmd_config, NULL);
1095         grep_init(&opt, prefix);
1096         super_prefix = get_super_prefix();
1097
1098         /*
1099          * If there is no -- then the paths must exist in the working
1100          * tree.  If there is no explicit pattern specified with -e or
1101          * -f, we take the first unrecognized non option to be the
1102          * pattern, but then what follows it must be zero or more
1103          * valid refs up to the -- (if exists), and then existing
1104          * paths.  If there is an explicit pattern, then the first
1105          * unrecognized non option is the beginning of the refs list
1106          * that continues up to the -- (if exists), and then paths.
1107          */
1108         argc = parse_options(argc, argv, prefix, options, grep_usage,
1109                              PARSE_OPT_KEEP_DASHDASH |
1110                              PARSE_OPT_STOP_AT_NON_OPTION);
1111         grep_commit_pattern_type(pattern_type_arg, &opt);
1112
1113         if (use_index && !startup_info->have_repository) {
1114                 int fallback = 0;
1115                 git_config_get_bool("grep.fallbacktonoindex", &fallback);
1116                 if (fallback)
1117                         use_index = 0;
1118                 else
1119                         /* die the same way as if we did it at the beginning */
1120                         setup_git_directory();
1121         }
1122
1123         /*
1124          * skip a -- separator; we know it cannot be
1125          * separating revisions from pathnames if
1126          * we haven't even had any patterns yet
1127          */
1128         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
1129                 argv++;
1130                 argc--;
1131         }
1132
1133         /* First unrecognized non-option token */
1134         if (argc > 0 && !opt.pattern_list) {
1135                 append_grep_pattern(&opt, argv[0], "command line", 0,
1136                                     GREP_PATTERN);
1137                 argv++;
1138                 argc--;
1139         }
1140
1141         if (show_in_pager == default_pager)
1142                 show_in_pager = git_pager(1);
1143         if (show_in_pager) {
1144                 opt.color = 0;
1145                 opt.name_only = 1;
1146                 opt.null_following_name = 1;
1147                 opt.output_priv = &path_list;
1148                 opt.output = append_path;
1149                 string_list_append(&path_list, show_in_pager);
1150         }
1151
1152         if (!opt.pattern_list)
1153                 die(_("no pattern given."));
1154         if (!opt.fixed && opt.ignore_case)
1155                 opt.regflags |= REG_ICASE;
1156
1157         compile_grep_patterns(&opt);
1158
1159         /*
1160          * We have to find "--" in a separate pass, because its presence
1161          * influences how we will parse arguments that come before it.
1162          */
1163         for (i = 0; i < argc; i++) {
1164                 if (!strcmp(argv[i], "--")) {
1165                         seen_dashdash = 1;
1166                         break;
1167                 }
1168         }
1169
1170         /*
1171          * Resolve any rev arguments. If we have a dashdash, then everything up
1172          * to it must resolve as a rev. If not, then we stop at the first
1173          * non-rev and assume everything else is a path.
1174          */
1175         allow_revs = use_index && !untracked;
1176         for (i = 0; i < argc; i++) {
1177                 const char *arg = argv[i];
1178                 struct object_id oid;
1179                 struct object_context oc;
1180                 struct object *object;
1181
1182                 if (!strcmp(arg, "--")) {
1183                         i++;
1184                         break;
1185                 }
1186
1187                 if (!allow_revs) {
1188                         if (seen_dashdash)
1189                                 die(_("--no-index or --untracked cannot be used with revs"));
1190                         break;
1191                 }
1192
1193                 if (get_sha1_with_context(arg, GET_SHA1_RECORD_PATH,
1194                                           oid.hash, &oc)) {
1195                         if (seen_dashdash)
1196                                 die(_("unable to resolve revision: %s"), arg);
1197                         break;
1198                 }
1199
1200                 object = parse_object_or_die(oid.hash, arg);
1201                 if (!seen_dashdash)
1202                         verify_non_filename(prefix, arg);
1203                 add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
1204                 free(oc.path);
1205         }
1206
1207         /*
1208          * Anything left over is presumed to be a path. But in the non-dashdash
1209          * "do what I mean" case, we verify and complain when that isn't true.
1210          */
1211         if (!seen_dashdash) {
1212                 int j;
1213                 for (j = i; j < argc; j++)
1214                         verify_filename(prefix, argv[j], j == i && allow_revs);
1215         }
1216
1217         parse_pathspec(&pathspec, 0,
1218                        PATHSPEC_PREFER_CWD |
1219                        (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
1220                        prefix, argv + i);
1221         pathspec.max_depth = opt.max_depth;
1222         pathspec.recursive = 1;
1223
1224 #ifndef NO_PTHREADS
1225         if (list.nr || cached || show_in_pager)
1226                 num_threads = 0;
1227         else if (num_threads == 0)
1228                 num_threads = GREP_NUM_THREADS_DEFAULT;
1229         else if (num_threads < 0)
1230                 die(_("invalid number of threads specified (%d)"), num_threads);
1231 #else
1232         num_threads = 0;
1233 #endif
1234
1235 #ifndef NO_PTHREADS
1236         if (num_threads) {
1237                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
1238                     && (opt.pre_context || opt.post_context ||
1239                         opt.file_break || opt.funcbody))
1240                         skip_first_line = 1;
1241                 start_threads(&opt);
1242         }
1243 #endif
1244
1245         if (recurse_submodules) {
1246                 gitmodules_config();
1247                 compile_submodule_options(&opt, argv + i, cached, untracked,
1248                                           opt_exclude, use_index,
1249                                           pattern_type_arg);
1250         }
1251
1252         if (show_in_pager && (cached || list.nr))
1253                 die(_("--open-files-in-pager only works on the worktree"));
1254
1255         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1256                 const char *pager = path_list.items[0].string;
1257                 int len = strlen(pager);
1258
1259                 if (len > 4 && is_dir_sep(pager[len - 5]))
1260                         pager += len - 4;
1261
1262                 if (opt.ignore_case && !strcmp("less", pager))
1263                         string_list_append(&path_list, "-I");
1264
1265                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1266                         struct strbuf buf = STRBUF_INIT;
1267                         strbuf_addf(&buf, "+/%s%s",
1268                                         strcmp("less", pager) ? "" : "*",
1269                                         opt.pattern_list->pattern);
1270                         string_list_append(&path_list, buf.buf);
1271                         strbuf_detach(&buf, NULL);
1272                 }
1273         }
1274
1275         if (recurse_submodules && (!use_index || untracked))
1276                 die(_("option not supported with --recurse-submodules."));
1277
1278         if (!show_in_pager && !opt.status_only)
1279                 setup_pager();
1280
1281         if (!use_index && (untracked || cached))
1282                 die(_("--cached or --untracked cannot be used with --no-index."));
1283
1284         if (!use_index || untracked) {
1285                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1286                 hit = grep_directory(&opt, &pathspec, use_exclude, use_index);
1287         } else if (0 <= opt_exclude) {
1288                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1289         } else if (!list.nr) {
1290                 if (!cached)
1291                         setup_work_tree();
1292
1293                 hit = grep_cache(&opt, &pathspec, cached);
1294         } else {
1295                 if (cached)
1296                         die(_("both --cached and trees are given."));
1297                 hit = grep_objects(&opt, &pathspec, &list);
1298         }
1299
1300         if (num_threads)
1301                 hit |= wait_all();
1302         if (hit && show_in_pager)
1303                 run_pager(&opt, prefix);
1304         clear_pathspec(&pathspec);
1305         free_grep_patterns(&opt);
1306         return !hit;
1307 }