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                 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 #ifdef NO_PTHREADS
 293                 else if (num_threads && num_threads != 1) {
 294                         /*
 295                          * TRANSLATORS: %s is the configuration
 296                          * variable for tweaking threads, currently
 297                          * grep.threads
 298                          */
 299                         warning(_("no threads support, ignoring %s"), var);
 300                         num_threads = 0;
 301                 }
 302 #endif
 303         }
 304
 305         if (!strcmp(var, "submodule.recurse"))
 306                 recurse_submodules = git_config_bool(var, value);
 307
 308         return st;
 309 }
 310
 311 static void *lock_and_read_oid_file(const struct object_id *oid, enum object_type *type, unsigned long *size)
 312 {
 313         void *data;
 314
 315         grep_read_lock();
 316         data = read_sha1_file(oid->hash, type, size);
 317         grep_read_unlock();
 318         return data;
 319 }
 320
 321 static int grep_oid(struct grep_opt *opt, const struct object_id *oid,
 322                      const char *filename, int tree_name_len,
 323                      const char *path)
 324 {
 325         struct strbuf pathbuf = STRBUF_INIT;
 326
 327         if (super_prefix) {
 328                 strbuf_add(&pathbuf, filename, tree_name_len);
 329                 strbuf_addstr(&pathbuf, super_prefix);
 330                 strbuf_addstr(&pathbuf, filename + tree_name_len);
 331         } else {
 332                 strbuf_addstr(&pathbuf, filename);
 333         }
 334
 335         if (opt->relative && opt->prefix_length) {
 336                 char *name = strbuf_detach(&pathbuf, NULL);
 337                 quote_path_relative(name + tree_name_len, opt->prefix, &pathbuf);
 338                 strbuf_insert(&pathbuf, 0, name, tree_name_len);
 339                 free(name);
 340         }
 341
 342 #ifndef NO_PTHREADS
 343         if (num_threads) {
 344                 add_work(opt, GREP_SOURCE_SHA1, pathbuf.buf, path, oid);
 345                 strbuf_release(&pathbuf);
 346                 return 0;
 347         } else
 348 #endif
 349         {
 350                 struct grep_source gs;
 351                 int hit;
 352
 353                 grep_source_init(&gs, GREP_SOURCE_SHA1, pathbuf.buf, path, oid);
 354                 strbuf_release(&pathbuf);
 355                 hit = grep_source(opt, &gs);
 356
 357                 grep_source_clear(&gs);
 358                 return hit;
 359         }
 360 }
 361
 362 static int grep_file(struct grep_opt *opt, const char *filename)
 363 {
 364         struct strbuf buf = STRBUF_INIT;
 365
 366         if (super_prefix)
 367                 strbuf_addstr(&buf, super_prefix);
 368         strbuf_addstr(&buf, filename);
 369
 370         if (opt->relative && opt->prefix_length) {
 371                 char *name = strbuf_detach(&buf, NULL);
 372                 quote_path_relative(name, opt->prefix, &buf);
 373                 free(name);
 374         }
 375
 376 #ifndef NO_PTHREADS
 377         if (num_threads) {
 378                 add_work(opt, GREP_SOURCE_FILE, buf.buf, filename, filename);
 379                 strbuf_release(&buf);
 380                 return 0;
 381         } else
 382 #endif
 383         {
 384                 struct grep_source gs;
 385                 int hit;
 386
 387                 grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename, filename);
 388                 strbuf_release(&buf);
 389                 hit = grep_source(opt, &gs);
 390
 391                 grep_source_clear(&gs);
 392                 return hit;
 393         }
 394 }
 395
 396 static void append_path(struct grep_opt *opt, const void *data, size_t len)
 397 {
 398         struct string_list *path_list = opt->output_priv;
 399
 400         if (len == 1 && *(const char *)data == '\0')
 401                 return;
 402         string_list_append(path_list, xstrndup(data, len));
 403 }
 404
 405 static void run_pager(struct grep_opt *opt, const char *prefix)
 406 {
 407         struct string_list *path_list = opt->output_priv;
 408         struct child_process child = CHILD_PROCESS_INIT;
 409         int i, status;
 410
 411         for (i = 0; i < path_list->nr; i++)
 412                 argv_array_push(&child.args, path_list->items[i].string);
 413         child.dir = prefix;
 414         child.use_shell = 1;
 415
 416         status = run_command(&child);
 417         if (status)
 418                 exit(status);
 419 }
 420
 421 static void compile_submodule_options(const struct grep_opt *opt,
 422                                       const char **argv,
 423                                       int cached, int untracked,
 424                                       int opt_exclude, int use_index,
 425                                       int pattern_type_arg)
 426 {
 427         struct grep_pat *pattern;
 428
 429         if (recurse_submodules)
 430                 argv_array_push(&submodule_options, "--recurse-submodules");
 431
 432         if (cached)
 433                 argv_array_push(&submodule_options, "--cached");
 434         if (!use_index)
 435                 argv_array_push(&submodule_options, "--no-index");
 436         if (untracked)
 437                 argv_array_push(&submodule_options, "--untracked");
 438         if (opt_exclude > 0)
 439                 argv_array_push(&submodule_options, "--exclude-standard");
 440
 441         if (opt->invert)
 442                 argv_array_push(&submodule_options, "-v");
 443         if (opt->ignore_case)
 444                 argv_array_push(&submodule_options, "-i");
 445         if (opt->word_regexp)
 446                 argv_array_push(&submodule_options, "-w");
 447         switch (opt->binary) {
 448         case GREP_BINARY_NOMATCH:
 449                 argv_array_push(&submodule_options, "-I");
 450                 break;
 451         case GREP_BINARY_TEXT:
 452                 argv_array_push(&submodule_options, "-a");
 453                 break;
 454         default:
 455                 break;
 456         }
 457         if (opt->allow_textconv)
 458                 argv_array_push(&submodule_options, "--textconv");
 459         if (opt->max_depth != -1)
 460                 argv_array_pushf(&submodule_options, "--max-depth=%d",
 461                                  opt->max_depth);
 462         if (opt->linenum)
 463                 argv_array_push(&submodule_options, "-n");
 464         if (!opt->pathname)
 465                 argv_array_push(&submodule_options, "-h");
 466         if (!opt->relative)
 467                 argv_array_push(&submodule_options, "--full-name");
 468         if (opt->name_only)
 469                 argv_array_push(&submodule_options, "-l");
 470         if (opt->unmatch_name_only)
 471                 argv_array_push(&submodule_options, "-L");
 472         if (opt->null_following_name)
 473                 argv_array_push(&submodule_options, "-z");
 474         if (opt->count)
 475                 argv_array_push(&submodule_options, "-c");
 476         if (opt->file_break)
 477                 argv_array_push(&submodule_options, "--break");
 478         if (opt->heading)
 479                 argv_array_push(&submodule_options, "--heading");
 480         if (opt->pre_context)
 481                 argv_array_pushf(&submodule_options, "--before-context=%d",
 482                                  opt->pre_context);
 483         if (opt->post_context)
 484                 argv_array_pushf(&submodule_options, "--after-context=%d",
 485                                  opt->post_context);
 486         if (opt->funcname)
 487                 argv_array_push(&submodule_options, "-p");
 488         if (opt->funcbody)
 489                 argv_array_push(&submodule_options, "-W");
 490         if (opt->all_match)
 491                 argv_array_push(&submodule_options, "--all-match");
 492         if (opt->debug)
 493                 argv_array_push(&submodule_options, "--debug");
 494         if (opt->status_only)
 495                 argv_array_push(&submodule_options, "-q");
 496
 497         switch (pattern_type_arg) {
 498         case GREP_PATTERN_TYPE_BRE:
 499                 argv_array_push(&submodule_options, "-G");
 500                 break;
 501         case GREP_PATTERN_TYPE_ERE:
 502                 argv_array_push(&submodule_options, "-E");
 503                 break;
 504         case GREP_PATTERN_TYPE_FIXED:
 505                 argv_array_push(&submodule_options, "-F");
 506                 break;
 507         case GREP_PATTERN_TYPE_PCRE:
 508                 argv_array_push(&submodule_options, "-P");
 509                 break;
 510         case GREP_PATTERN_TYPE_UNSPECIFIED:
 511                 break;
 512         default:
 513                 die("BUG: Added a new grep pattern type without updating switch statement");
 514         }
 515
 516         for (pattern = opt->pattern_list; pattern != NULL;
 517              pattern = pattern->next) {
 518                 switch (pattern->token) {
 519                 case GREP_PATTERN:
 520                         argv_array_pushf(&submodule_options, "-e%s",
 521                                          pattern->pattern);
 522                         break;
 523                 case GREP_AND:
 524                 case GREP_OPEN_PAREN:
 525                 case GREP_CLOSE_PAREN:
 526                 case GREP_NOT:
 527                 case GREP_OR:
 528                         argv_array_push(&submodule_options, pattern->pattern);
 529                         break;
 530                 /* BODY and HEAD are not used by git-grep */
 531                 case GREP_PATTERN_BODY:
 532                 case GREP_PATTERN_HEAD:
 533                         break;
 534                 }
 535         }
 536
 537         /*
 538          * Limit number of threads for child process to use.
 539          * This is to prevent potential fork-bomb behavior of git-grep as each
 540          * submodule process has its own thread pool.
 541          */
 542         argv_array_pushf(&submodule_options, "--threads=%d",
 543                          (num_threads + 1) / 2);
 544
 545         /* Add Pathspecs */
 546         argv_array_push(&submodule_options, "--");
 547         for (; *argv; argv++)
 548                 argv_array_push(&submodule_options, *argv);
 549 }
 550
 551 /*
 552  * Launch child process to grep contents of a submodule
 553  */
 554 static int grep_submodule_launch(struct grep_opt *opt,
 555                                  const struct grep_source *gs)
 556 {
 557         struct child_process cp = CHILD_PROCESS_INIT;
 558         int status, i;
 559         const char *end_of_base;
 560         const char *name;
 561         struct strbuf child_output = STRBUF_INIT;
 562
 563         end_of_base = strchr(gs->name, ':');
 564         if (gs->identifier && end_of_base)
 565                 name = end_of_base + 1;
 566         else
 567                 name = gs->name;
 568
 569         prepare_submodule_repo_env(&cp.env_array);
 570         argv_array_push(&cp.env_array, GIT_DIR_ENVIRONMENT);
 571
 572         if (opt->relative && opt->prefix_length)
 573                 argv_array_pushf(&cp.env_array, "%s=%s",
 574                                  GIT_TOPLEVEL_PREFIX_ENVIRONMENT,
 575                                  opt->prefix);
 576
 577         /* Add super prefix */
 578         argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
 579                          super_prefix ? super_prefix : "",
 580                          name);
 581         argv_array_push(&cp.args, "grep");
 582
 583         /*
 584          * Add basename of parent project
 585          * When performing grep on a tree object the filename is prefixed
 586          * with the object's name: 'tree-name:filename'.  In order to
 587          * provide uniformity of output we want to pass the name of the
 588          * parent project's object name to the submodule so the submodule can
 589          * prefix its output with the parent's name and not its own SHA1.
 590          */
 591         if (gs->identifier && end_of_base)
 592                 argv_array_pushf(&cp.args, "--parent-basename=%.*s",
 593                                  (int) (end_of_base - gs->name),
 594                                  gs->name);
 595
 596         /* Add options */
 597         for (i = 0; i < submodule_options.argc; i++) {
 598                 /*
 599                  * If there is a tree identifier for the submodule, add the
 600                  * rev after adding the submodule options but before the
 601                  * pathspecs.  To do this we listen for the '--' and insert the
 602                  * sha1 before pushing the '--' onto the child process argv
 603                  * array.
 604                  */
 605                 if (gs->identifier &&
 606                     !strcmp("--", submodule_options.argv[i])) {
 607                         argv_array_push(&cp.args, sha1_to_hex(gs->identifier));
 608                 }
 609
 610                 argv_array_push(&cp.args, submodule_options.argv[i]);
 611         }
 612
 613         cp.git_cmd = 1;
 614         cp.dir = gs->path;
 615
 616         /*
 617          * Capture output to output buffer and check the return code from the
 618          * child process.  A '0' indicates a hit, a '1' indicates no hit and
 619          * anything else is an error.
 620          */
 621         status = capture_command(&cp, &child_output, 0);
 622         if (status && (status != 1)) {
 623                 /* flush the buffer */
 624                 write_or_die(1, child_output.buf, child_output.len);
 625                 die("process for submodule '%s' failed with exit code: %d",
 626                     gs->name, status);
 627         }
 628
 629         opt->output(opt, child_output.buf, child_output.len);
 630         strbuf_release(&child_output);
 631         /* invert the return code to make a hit equal to 1 */
 632         return !status;
 633 }
 634
 635 /*
 636  * Prep grep structures for a submodule grep
 637  * sha1: the sha1 of the submodule or NULL if using the working tree
 638  * filename: name of the submodule including tree name of parent
 639  * path: location of the submodule
 640  */
 641 static int grep_submodule(struct grep_opt *opt, const unsigned char *sha1,
 642                           const char *filename, const char *path)
 643 {
 644         if (!is_submodule_initialized(path))
 645                 return 0;
 646         if (!is_submodule_populated_gently(path, NULL)) {
 647                 /*
 648                  * If searching history, check for the presense of the
 649                  * submodule's gitdir before skipping the submodule.
 650                  */
 651                 if (sha1) {
 652                         const struct submodule *sub =
 653                                         submodule_from_path(null_sha1, path);
 654                         if (sub)
 655                                 path = git_path("modules/%s", sub->name);
 656
 657                         if (!(is_directory(path) && is_git_directory(path)))
 658                                 return 0;
 659                 } else {
 660                         return 0;
 661                 }
 662         }
 663
 664 #ifndef NO_PTHREADS
 665         if (num_threads) {
 666                 add_work(opt, GREP_SOURCE_SUBMODULE, filename, path, sha1);
 667                 return 0;
 668         } else
 669 #endif
 670         {
 671                 struct grep_source gs;
 672                 int hit;
 673
 674                 grep_source_init(&gs, GREP_SOURCE_SUBMODULE,
 675                                  filename, path, sha1);
 676                 hit = grep_submodule_launch(opt, &gs);
 677
 678                 grep_source_clear(&gs);
 679                 return hit;
 680         }
 681 }
 682
 683 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec,
 684                       int cached)
 685 {
 686         int hit = 0;
 687         int nr;
 688         struct strbuf name = STRBUF_INIT;
 689         int name_base_len = 0;
 690         if (super_prefix) {
 691                 name_base_len = strlen(super_prefix);
 692                 strbuf_addstr(&name, super_prefix);
 693         }
 694
 695         read_cache();
 696
 697         for (nr = 0; nr < active_nr; nr++) {
 698                 const struct cache_entry *ce = active_cache[nr];
 699                 strbuf_setlen(&name, name_base_len);
 700                 strbuf_addstr(&name, ce->name);
 701
 702                 if (S_ISREG(ce->ce_mode) &&
 703                     match_pathspec(pathspec, name.buf, name.len, 0, NULL,
 704                                    S_ISDIR(ce->ce_mode) ||
 705                                    S_ISGITLINK(ce->ce_mode))) {
 706                         /*
 707                          * If CE_VALID is on, we assume worktree file and its
 708                          * cache entry are identical, even if worktree file has
 709                          * been modified, so use cache version instead
 710                          */
 711                         if (cached || (ce->ce_flags & CE_VALID) ||
 712                             ce_skip_worktree(ce)) {
 713                                 if (ce_stage(ce) || ce_intent_to_add(ce))
 714                                         continue;
 715                                 hit |= grep_oid(opt, &ce->oid, ce->name,
 716                                                  0, ce->name);
 717                         } else {
 718                                 hit |= grep_file(opt, ce->name);
 719                         }
 720                 } else if (recurse_submodules && S_ISGITLINK(ce->ce_mode) &&
 721                            submodule_path_match(pathspec, name.buf, NULL)) {
 722                         hit |= grep_submodule(opt, NULL, ce->name, ce->name);
 723                 } else {
 724                         continue;
 725                 }
 726
 727                 if (ce_stage(ce)) {
 728                         do {
 729                                 nr++;
 730                         } while (nr < active_nr &&
 731                                  !strcmp(ce->name, active_cache[nr]->name));
 732                         nr--; /* compensate for loop control */
 733                 }
 734                 if (hit && opt->status_only)
 735                         break;
 736         }
 737
 738         strbuf_release(&name);
 739         return hit;
 740 }
 741
 742 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 743                      struct tree_desc *tree, struct strbuf *base, int tn_len,
 744                      int check_attr)
 745 {
 746         int hit = 0;
 747         enum interesting match = entry_not_interesting;
 748         struct name_entry entry;
 749         int old_baselen = base->len;
 750         struct strbuf name = STRBUF_INIT;
 751         int name_base_len = 0;
 752         if (super_prefix) {
 753                 strbuf_addstr(&name, super_prefix);
 754                 name_base_len = name.len;
 755         }
 756
 757         while (tree_entry(tree, &entry)) {
 758                 int te_len = tree_entry_len(&entry);
 759
 760                 if (match != all_entries_interesting) {
 761                         strbuf_addstr(&name, base->buf + tn_len);
 762                         match = tree_entry_interesting(&entry, &name,
 763                                                        0, pathspec);
 764                         strbuf_setlen(&name, name_base_len);
 765
 766                         if (match == all_entries_not_interesting)
 767                                 break;
 768                         if (match == entry_not_interesting)
 769                                 continue;
 770                 }
 771
 772                 strbuf_add(base, entry.path, te_len);
 773
 774                 if (S_ISREG(entry.mode)) {
 775                         hit |= grep_oid(opt, entry.oid, base->buf, tn_len,
 776                                          check_attr ? base->buf + tn_len : NULL);
 777                 } else if (S_ISDIR(entry.mode)) {
 778                         enum object_type type;
 779                         struct tree_desc sub;
 780                         void *data;
 781                         unsigned long size;
 782
 783                         data = lock_and_read_oid_file(entry.oid, &type, &size);
 784                         if (!data)
 785                                 die(_("unable to read tree (%s)"),
 786                                     oid_to_hex(entry.oid));
 787
 788                         strbuf_addch(base, '/');
 789                         init_tree_desc(&sub, data, size);
 790                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
 791                                          check_attr);
 792                         free(data);
 793                 } else if (recurse_submodules && S_ISGITLINK(entry.mode)) {
 794                         hit |= grep_submodule(opt, entry.oid->hash, base->buf,
 795                                               base->buf + tn_len);
 796                 }
 797
 798                 strbuf_setlen(base, old_baselen);
 799
 800                 if (hit && opt->status_only)
 801                         break;
 802         }
 803
 804         strbuf_release(&name);
 805         return hit;
 806 }
 807
 808 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 809                        struct object *obj, const char *name, const char *path)
 810 {
 811         if (obj->type == OBJ_BLOB)
 812                 return grep_oid(opt, &obj->oid, name, 0, path);
 813         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 814                 struct tree_desc tree;
 815                 void *data;
 816                 unsigned long size;
 817                 struct strbuf base;
 818                 int hit, len;
 819
 820                 grep_read_lock();
 821                 data = read_object_with_reference(obj->oid.hash, tree_type,
 822                                                   &size, NULL);
 823                 grep_read_unlock();
 824
 825                 if (!data)
 826                         die(_("unable to read tree (%s)"), oid_to_hex(&obj->oid));
 827
 828                 /* Use parent's name as base when recursing submodules */
 829                 if (recurse_submodules && parent_basename)
 830                         name = parent_basename;
 831
 832                 len = name ? strlen(name) : 0;
 833                 strbuf_init(&base, PATH_MAX + len + 1);
 834                 if (len) {
 835                         strbuf_add(&base, name, len);
 836                         strbuf_addch(&base, ':');
 837                 }
 838                 init_tree_desc(&tree, data, size);
 839                 hit = grep_tree(opt, pathspec, &tree, &base, base.len,
 840                                 obj->type == OBJ_COMMIT);
 841                 strbuf_release(&base);
 842                 free(data);
 843                 return hit;
 844         }
 845         die(_("unable to grep from object of type %s"), typename(obj->type));
 846 }
 847
 848 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 849                         const struct object_array *list)
 850 {
 851         unsigned int i;
 852         int hit = 0;
 853         const unsigned int nr = list->nr;
 854
 855         for (i = 0; i < nr; i++) {
 856                 struct object *real_obj;
 857                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
 858
 859                 /* load the gitmodules file for this rev */
 860                 if (recurse_submodules) {
 861                         submodule_free();
 862                         gitmodules_config_sha1(real_obj->oid.hash);
 863                 }
 864                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name, list->objects[i].path)) {
 865                         hit = 1;
 866                         if (opt->status_only)
 867                                 break;
 868                 }
 869         }
 870         return hit;
 871 }
 872
 873 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
 874                           int exc_std, int use_index)
 875 {
 876         struct dir_struct dir;
 877         int i, hit = 0;
 878
 879         memset(&dir, 0, sizeof(dir));
 880         if (!use_index)
 881                 dir.flags |= DIR_NO_GITLINKS;
 882         if (exc_std)
 883                 setup_standard_excludes(&dir);
 884
 885         fill_directory(&dir, &the_index, pathspec);
 886         for (i = 0; i < dir.nr; i++) {
 887                 if (!dir_path_match(dir.entries[i], pathspec, 0, NULL))
 888                         continue;
 889                 hit |= grep_file(opt, dir.entries[i]->name);
 890                 if (hit && opt->status_only)
 891                         break;
 892         }
 893         return hit;
 894 }
 895
 896 static int context_callback(const struct option *opt, const char *arg,
 897                             int unset)
 898 {
 899         struct grep_opt *grep_opt = opt->value;
 900         int value;
 901         const char *endp;
 902
 903         if (unset) {
 904                 grep_opt->pre_context = grep_opt->post_context = 0;
 905                 return 0;
 906         }
 907         value = strtol(arg, (char **)&endp, 10);
 908         if (*endp) {
 909                 return error(_("switch `%c' expects a numerical value"),
 910                              opt->short_name);
 911         }
 912         grep_opt->pre_context = grep_opt->post_context = value;
 913         return 0;
 914 }
 915
 916 static int file_callback(const struct option *opt, const char *arg, int unset)
 917 {
 918         struct grep_opt *grep_opt = opt->value;
 919         int from_stdin = !strcmp(arg, "-");
 920         FILE *patterns;
 921         int lno = 0;
 922         struct strbuf sb = STRBUF_INIT;
 923
 924         patterns = from_stdin ? stdin : fopen(arg, "r");
 925         if (!patterns)
 926                 die_errno(_("cannot open '%s'"), arg);
 927         while (strbuf_getline(&sb, patterns) == 0) {
 928                 /* ignore empty line like grep does */
 929                 if (sb.len == 0)
 930                         continue;
 931
 932                 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
 933                                 GREP_PATTERN);
 934         }
 935         if (!from_stdin)
 936                 fclose(patterns);
 937         strbuf_release(&sb);
 938         return 0;
 939 }
 940
 941 static int not_callback(const struct option *opt, const char *arg, int unset)
 942 {
 943         struct grep_opt *grep_opt = opt->value;
 944         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 945         return 0;
 946 }
 947
 948 static int and_callback(const struct option *opt, const char *arg, int unset)
 949 {
 950         struct grep_opt *grep_opt = opt->value;
 951         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 952         return 0;
 953 }
 954
 955 static int open_callback(const struct option *opt, const char *arg, int unset)
 956 {
 957         struct grep_opt *grep_opt = opt->value;
 958         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 959         return 0;
 960 }
 961
 962 static int close_callback(const struct option *opt, const char *arg, int unset)
 963 {
 964         struct grep_opt *grep_opt = opt->value;
 965         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 966         return 0;
 967 }
 968
 969 static int pattern_callback(const struct option *opt, const char *arg,
 970                             int unset)
 971 {
 972         struct grep_opt *grep_opt = opt->value;
 973         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 974         return 0;
 975 }
 976
 977 int cmd_grep(int argc, const char **argv, const char *prefix)
 978 {
 979         int hit = 0;
 980         int cached = 0, untracked = 0, opt_exclude = -1;
 981         int seen_dashdash = 0;
 982         int external_grep_allowed__ignored;
 983         const char *show_in_pager = NULL, *default_pager = "dummy";
 984         struct grep_opt opt;
 985         struct object_array list = OBJECT_ARRAY_INIT;
 986         struct pathspec pathspec;
 987         struct string_list path_list = STRING_LIST_INIT_NODUP;
 988         int i;
 989         int dummy;
 990         int use_index = 1;
 991         int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 992         int allow_revs;
 993
 994         struct option options[] = {
 995                 OPT_BOOL(0, "cached", &cached,
 996                         N_("search in index instead of in the work tree")),
 997                 OPT_NEGBIT(0, "no-index", &use_index,
 998                          N_("find in contents not managed by git"), 1),
 999                 OPT_BOOL(0, "untracked", &untracked,
1000                         N_("search in both tracked and untracked files")),
1001                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
1002                             N_("ignore files specified via '.gitignore'"), 1),
1003                 OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
1004                          N_("recursively search in each submodule")),
1005                 OPT_STRING(0, "parent-basename", &parent_basename,
1006                            N_("basename"),
1007                            N_("prepend parent project's basename to output")),
1008                 OPT_GROUP(""),
1009                 OPT_BOOL('v', "invert-match", &opt.invert,
1010                         N_("show non-matching lines")),
1011                 OPT_BOOL('i', "ignore-case", &opt.ignore_case,
1012                         N_("case insensitive matching")),
1013                 OPT_BOOL('w', "word-regexp", &opt.word_regexp,
1014                         N_("match patterns only at word boundaries")),
1015                 OPT_SET_INT('a', "text", &opt.binary,
1016                         N_("process binary files as text"), GREP_BINARY_TEXT),
1017                 OPT_SET_INT('I', NULL, &opt.binary,
1018                         N_("don't match patterns in binary files"),
1019                         GREP_BINARY_NOMATCH),
1020                 OPT_BOOL(0, "textconv", &opt.allow_textconv,
1021                          N_("process binary files with textconv filters")),
1022                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
1023                         N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
1024                         NULL, 1 },
1025                 OPT_GROUP(""),
1026                 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
1027                             N_("use extended POSIX regular expressions"),
1028                             GREP_PATTERN_TYPE_ERE),
1029                 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
1030                             N_("use basic POSIX regular expressions (default)"),
1031                             GREP_PATTERN_TYPE_BRE),
1032                 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
1033                             N_("interpret patterns as fixed strings"),
1034                             GREP_PATTERN_TYPE_FIXED),
1035                 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
1036                             N_("use Perl-compatible regular expressions"),
1037                             GREP_PATTERN_TYPE_PCRE),
1038                 OPT_GROUP(""),
1039                 OPT_BOOL('n', "line-number", &opt.linenum, N_("show line numbers")),
1040                 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
1041                 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
1042                 OPT_NEGBIT(0, "full-name", &opt.relative,
1043                         N_("show filenames relative to top directory"), 1),
1044                 OPT_BOOL('l', "files-with-matches", &opt.name_only,
1045                         N_("show only filenames instead of matching lines")),
1046                 OPT_BOOL(0, "name-only", &opt.name_only,
1047                         N_("synonym for --files-with-matches")),
1048                 OPT_BOOL('L', "files-without-match",
1049                         &opt.unmatch_name_only,
1050                         N_("show only the names of files without match")),
1051                 OPT_BOOL('z', "null", &opt.null_following_name,
1052                         N_("print NUL after filenames")),
1053                 OPT_BOOL('c', "count", &opt.count,
1054                         N_("show the number of matches instead of matching lines")),
1055                 OPT__COLOR(&opt.color, N_("highlight matches")),
1056                 OPT_BOOL(0, "break", &opt.file_break,
1057                         N_("print empty line between matches from different files")),
1058                 OPT_BOOL(0, "heading", &opt.heading,
1059                         N_("show filename only once above matches from same file")),
1060                 OPT_GROUP(""),
1061                 OPT_CALLBACK('C', "context", &opt, N_("n"),
1062                         N_("show <n> context lines before and after matches"),
1063                         context_callback),
1064                 OPT_INTEGER('B', "before-context", &opt.pre_context,
1065                         N_("show <n> context lines before matches")),
1066                 OPT_INTEGER('A', "after-context", &opt.post_context,
1067                         N_("show <n> context lines after matches")),
1068                 OPT_INTEGER(0, "threads", &num_threads,
1069                         N_("use <n> worker threads")),
1070                 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
1071                         context_callback),
1072                 OPT_BOOL('p', "show-function", &opt.funcname,
1073                         N_("show a line with the function name before matches")),
1074                 OPT_BOOL('W', "function-context", &opt.funcbody,
1075                         N_("show the surrounding function")),
1076                 OPT_GROUP(""),
1077                 OPT_CALLBACK('f', NULL, &opt, N_("file"),
1078                         N_("read patterns from file"), file_callback),
1079                 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
1080                         N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
1081                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
1082                   N_("combine patterns specified with -e"),
1083                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
1084                 OPT_BOOL(0, "or", &dummy, ""),
1085                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
1086                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
1087                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
1088                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1089                   open_callback },
1090                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
1091                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1092                   close_callback },
1093                 OPT__QUIET(&opt.status_only,
1094                            N_("indicate hit with exit status without output")),
1095                 OPT_BOOL(0, "all-match", &opt.all_match,
1096                         N_("show only matches from files that match all patterns")),
1097                 { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
1098                   N_("show parse tree for grep expression"),
1099                   PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
1100                 OPT_GROUP(""),
1101                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
1102                         N_("pager"), N_("show matching files in the pager"),
1103                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
1104                 OPT_BOOL(0, "ext-grep", &external_grep_allowed__ignored,
1105                          N_("allow calling of grep(1) (ignored by this build)")),
1106                 OPT_END()
1107         };
1108
1109         init_grep_defaults();
1110         git_config(grep_cmd_config, NULL);
1111         grep_init(&opt, prefix);
1112         super_prefix = get_super_prefix();
1113
1114         /*
1115          * If there is no -- then the paths must exist in the working
1116          * tree.  If there is no explicit pattern specified with -e or
1117          * -f, we take the first unrecognized non option to be the
1118          * pattern, but then what follows it must be zero or more
1119          * valid refs up to the -- (if exists), and then existing
1120          * paths.  If there is an explicit pattern, then the first
1121          * unrecognized non option is the beginning of the refs list
1122          * that continues up to the -- (if exists), and then paths.
1123          */
1124         argc = parse_options(argc, argv, prefix, options, grep_usage,
1125                              PARSE_OPT_KEEP_DASHDASH |
1126                              PARSE_OPT_STOP_AT_NON_OPTION);
1127         grep_commit_pattern_type(pattern_type_arg, &opt);
1128
1129         if (use_index && !startup_info->have_repository) {
1130                 int fallback = 0;
1131                 git_config_get_bool("grep.fallbacktonoindex", &fallback);
1132                 if (fallback)
1133                         use_index = 0;
1134                 else
1135                         /* die the same way as if we did it at the beginning */
1136                         setup_git_directory();
1137         }
1138
1139         /*
1140          * skip a -- separator; we know it cannot be
1141          * separating revisions from pathnames if
1142          * we haven't even had any patterns yet
1143          */
1144         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
1145                 argv++;
1146                 argc--;
1147         }
1148
1149         /* First unrecognized non-option token */
1150         if (argc > 0 && !opt.pattern_list) {
1151                 append_grep_pattern(&opt, argv[0], "command line", 0,
1152                                     GREP_PATTERN);
1153                 argv++;
1154                 argc--;
1155         }
1156
1157         if (show_in_pager == default_pager)
1158                 show_in_pager = git_pager(1);
1159         if (show_in_pager) {
1160                 opt.color = 0;
1161                 opt.name_only = 1;
1162                 opt.null_following_name = 1;
1163                 opt.output_priv = &path_list;
1164                 opt.output = append_path;
1165                 string_list_append(&path_list, show_in_pager);
1166         }
1167
1168         if (!opt.pattern_list)
1169                 die(_("no pattern given."));
1170         if (!opt.fixed && opt.ignore_case)
1171                 opt.regflags |= REG_ICASE;
1172
1173         compile_grep_patterns(&opt);
1174
1175         /*
1176          * We have to find "--" in a separate pass, because its presence
1177          * influences how we will parse arguments that come before it.
1178          */
1179         for (i = 0; i < argc; i++) {
1180                 if (!strcmp(argv[i], "--")) {
1181                         seen_dashdash = 1;
1182                         break;
1183                 }
1184         }
1185
1186         /*
1187          * Resolve any rev arguments. If we have a dashdash, then everything up
1188          * to it must resolve as a rev. If not, then we stop at the first
1189          * non-rev and assume everything else is a path.
1190          */
1191         allow_revs = use_index && !untracked;
1192         for (i = 0; i < argc; i++) {
1193                 const char *arg = argv[i];
1194                 struct object_id oid;
1195                 struct object_context oc;
1196                 struct object *object;
1197
1198                 if (!strcmp(arg, "--")) {
1199                         i++;
1200                         break;
1201                 }
1202
1203                 if (!allow_revs) {
1204                         if (seen_dashdash)
1205                                 die(_("--no-index or --untracked cannot be used with revs"));
1206                         break;
1207                 }
1208
1209                 if (get_sha1_with_context(arg, GET_SHA1_RECORD_PATH,
1210                                           oid.hash, &oc)) {
1211                         if (seen_dashdash)
1212                                 die(_("unable to resolve revision: %s"), arg);
1213                         break;
1214                 }
1215
1216                 object = parse_object_or_die(&oid, arg);
1217                 if (!seen_dashdash)
1218                         verify_non_filename(prefix, arg);
1219                 add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
1220                 free(oc.path);
1221         }
1222
1223         /*
1224          * Anything left over is presumed to be a path. But in the non-dashdash
1225          * "do what I mean" case, we verify and complain when that isn't true.
1226          */
1227         if (!seen_dashdash) {
1228                 int j;
1229                 for (j = i; j < argc; j++)
1230                         verify_filename(prefix, argv[j], j == i && allow_revs);
1231         }
1232
1233         parse_pathspec(&pathspec, 0,
1234                        PATHSPEC_PREFER_CWD |
1235                        (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
1236                        prefix, argv + i);
1237         pathspec.max_depth = opt.max_depth;
1238         pathspec.recursive = 1;
1239
1240 #ifndef NO_PTHREADS
1241         if (list.nr || cached || show_in_pager)
1242                 num_threads = 0;
1243         else if (num_threads == 0)
1244                 num_threads = GREP_NUM_THREADS_DEFAULT;
1245         else if (num_threads < 0)
1246                 die(_("invalid number of threads specified (%d)"), num_threads);
1247 #else
1248         if (num_threads)
1249                 warning(_("no threads support, ignoring --threads"));
1250         num_threads = 0;
1251 #endif
1252
1253 #ifndef NO_PTHREADS
1254         if (num_threads) {
1255                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
1256                     && (opt.pre_context || opt.post_context ||
1257                         opt.file_break || opt.funcbody))
1258                         skip_first_line = 1;
1259                 start_threads(&opt);
1260         }
1261 #endif
1262
1263         if (recurse_submodules) {
1264                 gitmodules_config();
1265                 compile_submodule_options(&opt, argv + i, cached, untracked,
1266                                           opt_exclude, use_index,
1267                                           pattern_type_arg);
1268         }
1269
1270         if (show_in_pager && (cached || list.nr))
1271                 die(_("--open-files-in-pager only works on the worktree"));
1272
1273         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1274                 const char *pager = path_list.items[0].string;
1275                 int len = strlen(pager);
1276
1277                 if (len > 4 && is_dir_sep(pager[len - 5]))
1278                         pager += len - 4;
1279
1280                 if (opt.ignore_case && !strcmp("less", pager))
1281                         string_list_append(&path_list, "-I");
1282
1283                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1284                         struct strbuf buf = STRBUF_INIT;
1285                         strbuf_addf(&buf, "+/%s%s",
1286                                         strcmp("less", pager) ? "" : "*",
1287                                         opt.pattern_list->pattern);
1288                         string_list_append(&path_list, buf.buf);
1289                         strbuf_detach(&buf, NULL);
1290                 }
1291         }
1292
1293         if (recurse_submodules && (!use_index || untracked))
1294                 die(_("option not supported with --recurse-submodules."));
1295
1296         if (!show_in_pager && !opt.status_only)
1297                 setup_pager();
1298
1299         if (!use_index && (untracked || cached))
1300                 die(_("--cached or --untracked cannot be used with --no-index."));
1301
1302         if (!use_index || untracked) {
1303                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1304                 hit = grep_directory(&opt, &pathspec, use_exclude, use_index);
1305         } else if (0 <= opt_exclude) {
1306                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1307         } else if (!list.nr) {
1308                 if (!cached)
1309                         setup_work_tree();
1310
1311                 hit = grep_cache(&opt, &pathspec, cached);
1312         } else {
1313                 if (cached)
1314                         die(_("both --cached and trees are given."));
1315                 hit = grep_objects(&opt, &pathspec, &list);
1316         }
1317
1318         if (num_threads)
1319                 hit |= wait_all();
1320         if (hit && show_in_pager)
1321                 run_pager(&opt, prefix);
1322         clear_pathspec(&pathspec);
1323         free_grep_patterns(&opt);
1324         return !hit;
1325 }