Andrew's git / gitweb.git / builtin/grep.c
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builtin / grep.con commit grep: fix builds with with no thread support (2225e1e)
   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
  24static char const * const grep_usage[] = {
  25        N_("git grep [<options>] [-e] <pattern> [<rev>...] [[--] <path>...]"),
  26        NULL
  27};
  28
  29static const char *super_prefix;
  30static int recurse_submodules;
  31static struct argv_array submodule_options = ARGV_ARRAY_INIT;
  32static const char *parent_basename;
  33
  34static int grep_submodule_launch(struct grep_opt *opt,
  35                                 const struct grep_source *gs);
  36
  37#define GREP_NUM_THREADS_DEFAULT 8
  38static int num_threads;
  39
  40#ifndef NO_PTHREADS
  41static 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 */
  47struct 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
  63static struct work_item todo[TODO_SIZE];
  64static int todo_start;
  65static int todo_end;
  66static int todo_done;
  67
  68/* Has all work items been added? */
  69static int all_work_added;
  70
  71/* This lock protects all the variables above. */
  72static pthread_mutex_t grep_mutex;
  73
  74static inline void grep_lock(void)
  75{
  76        if (num_threads)
  77                pthread_mutex_lock(&grep_mutex);
  78}
  79
  80static 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. */
  87static pthread_cond_t cond_add;
  88
  89/* Signalled when the result from one work_item is written to
  90 * stdout.
  91 */
  92static pthread_cond_t cond_write;
  93
  94/* Signalled when we are finished with everything. */
  95static pthread_cond_t cond_result;
  96
  97static int skip_first_line;
  98
  99static 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
 119static 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
 138static 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
 176static 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
 200static 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
 206static 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
 237static 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
 275static int wait_all(void)
 276{
 277        return 0;
 278}
 279#endif
 280
 281static 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
 297static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 298{
 299        void *data;
 300
 301        grep_read_lock();
 302        data = read_sha1_file(sha1, type, size);
 303        grep_read_unlock();
 304        return data;
 305}
 306
 307static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
 308                     const char *filename, int tree_name_len,
 309                     const char *path)
 310{
 311        struct strbuf pathbuf = STRBUF_INIT;
 312
 313        if (opt->relative && opt->prefix_length) {
 314                quote_path_relative(filename + tree_name_len, opt->prefix, &pathbuf);
 315                strbuf_insert(&pathbuf, 0, filename, tree_name_len);
 316        } else if (super_prefix) {
 317                strbuf_add(&pathbuf, filename, tree_name_len);
 318                strbuf_addstr(&pathbuf, super_prefix);
 319                strbuf_addstr(&pathbuf, filename + tree_name_len);
 320        } else {
 321                strbuf_addstr(&pathbuf, filename);
 322        }
 323
 324#ifndef NO_PTHREADS
 325        if (num_threads) {
 326                add_work(opt, GREP_SOURCE_SHA1, pathbuf.buf, path, sha1);
 327                strbuf_release(&pathbuf);
 328                return 0;
 329        } else
 330#endif
 331        {
 332                struct grep_source gs;
 333                int hit;
 334
 335                grep_source_init(&gs, GREP_SOURCE_SHA1, pathbuf.buf, path, sha1);
 336                strbuf_release(&pathbuf);
 337                hit = grep_source(opt, &gs);
 338
 339                grep_source_clear(&gs);
 340                return hit;
 341        }
 342}
 343
 344static int grep_file(struct grep_opt *opt, const char *filename)
 345{
 346        struct strbuf buf = STRBUF_INIT;
 347
 348        if (opt->relative && opt->prefix_length) {
 349                quote_path_relative(filename, opt->prefix, &buf);
 350        } else {
 351                if (super_prefix)
 352                        strbuf_addstr(&buf, super_prefix);
 353                strbuf_addstr(&buf, filename);
 354        }
 355
 356#ifndef NO_PTHREADS
 357        if (num_threads) {
 358                add_work(opt, GREP_SOURCE_FILE, buf.buf, filename, filename);
 359                strbuf_release(&buf);
 360                return 0;
 361        } else
 362#endif
 363        {
 364                struct grep_source gs;
 365                int hit;
 366
 367                grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename, filename);
 368                strbuf_release(&buf);
 369                hit = grep_source(opt, &gs);
 370
 371                grep_source_clear(&gs);
 372                return hit;
 373        }
 374}
 375
 376static void append_path(struct grep_opt *opt, const void *data, size_t len)
 377{
 378        struct string_list *path_list = opt->output_priv;
 379
 380        if (len == 1 && *(const char *)data == '\0')
 381                return;
 382        string_list_append(path_list, xstrndup(data, len));
 383}
 384
 385static void run_pager(struct grep_opt *opt, const char *prefix)
 386{
 387        struct string_list *path_list = opt->output_priv;
 388        struct child_process child = CHILD_PROCESS_INIT;
 389        int i, status;
 390
 391        for (i = 0; i < path_list->nr; i++)
 392                argv_array_push(&child.args, path_list->items[i].string);
 393        child.dir = prefix;
 394        child.use_shell = 1;
 395
 396        status = run_command(&child);
 397        if (status)
 398                exit(status);
 399}
 400
 401static void compile_submodule_options(const struct grep_opt *opt,
 402                                      const struct pathspec *pathspec,
 403                                      int cached, int untracked,
 404                                      int opt_exclude, int use_index,
 405                                      int pattern_type_arg)
 406{
 407        struct grep_pat *pattern;
 408        int i;
 409
 410        if (recurse_submodules)
 411                argv_array_push(&submodule_options, "--recurse-submodules");
 412
 413        if (cached)
 414                argv_array_push(&submodule_options, "--cached");
 415        if (!use_index)
 416                argv_array_push(&submodule_options, "--no-index");
 417        if (untracked)
 418                argv_array_push(&submodule_options, "--untracked");
 419        if (opt_exclude > 0)
 420                argv_array_push(&submodule_options, "--exclude-standard");
 421
 422        if (opt->invert)
 423                argv_array_push(&submodule_options, "-v");
 424        if (opt->ignore_case)
 425                argv_array_push(&submodule_options, "-i");
 426        if (opt->word_regexp)
 427                argv_array_push(&submodule_options, "-w");
 428        switch (opt->binary) {
 429        case GREP_BINARY_NOMATCH:
 430                argv_array_push(&submodule_options, "-I");
 431                break;
 432        case GREP_BINARY_TEXT:
 433                argv_array_push(&submodule_options, "-a");
 434                break;
 435        default:
 436                break;
 437        }
 438        if (opt->allow_textconv)
 439                argv_array_push(&submodule_options, "--textconv");
 440        if (opt->max_depth != -1)
 441                argv_array_pushf(&submodule_options, "--max-depth=%d",
 442                                 opt->max_depth);
 443        if (opt->linenum)
 444                argv_array_push(&submodule_options, "-n");
 445        if (!opt->pathname)
 446                argv_array_push(&submodule_options, "-h");
 447        if (!opt->relative)
 448                argv_array_push(&submodule_options, "--full-name");
 449        if (opt->name_only)
 450                argv_array_push(&submodule_options, "-l");
 451        if (opt->unmatch_name_only)
 452                argv_array_push(&submodule_options, "-L");
 453        if (opt->null_following_name)
 454                argv_array_push(&submodule_options, "-z");
 455        if (opt->count)
 456                argv_array_push(&submodule_options, "-c");
 457        if (opt->file_break)
 458                argv_array_push(&submodule_options, "--break");
 459        if (opt->heading)
 460                argv_array_push(&submodule_options, "--heading");
 461        if (opt->pre_context)
 462                argv_array_pushf(&submodule_options, "--before-context=%d",
 463                                 opt->pre_context);
 464        if (opt->post_context)
 465                argv_array_pushf(&submodule_options, "--after-context=%d",
 466                                 opt->post_context);
 467        if (opt->funcname)
 468                argv_array_push(&submodule_options, "-p");
 469        if (opt->funcbody)
 470                argv_array_push(&submodule_options, "-W");
 471        if (opt->all_match)
 472                argv_array_push(&submodule_options, "--all-match");
 473        if (opt->debug)
 474                argv_array_push(&submodule_options, "--debug");
 475        if (opt->status_only)
 476                argv_array_push(&submodule_options, "-q");
 477
 478        switch (pattern_type_arg) {
 479        case GREP_PATTERN_TYPE_BRE:
 480                argv_array_push(&submodule_options, "-G");
 481                break;
 482        case GREP_PATTERN_TYPE_ERE:
 483                argv_array_push(&submodule_options, "-E");
 484                break;
 485        case GREP_PATTERN_TYPE_FIXED:
 486                argv_array_push(&submodule_options, "-F");
 487                break;
 488        case GREP_PATTERN_TYPE_PCRE:
 489                argv_array_push(&submodule_options, "-P");
 490                break;
 491        case GREP_PATTERN_TYPE_UNSPECIFIED:
 492                break;
 493        }
 494
 495        for (pattern = opt->pattern_list; pattern != NULL;
 496             pattern = pattern->next) {
 497                switch (pattern->token) {
 498                case GREP_PATTERN:
 499                        argv_array_pushf(&submodule_options, "-e%s",
 500                                         pattern->pattern);
 501                        break;
 502                case GREP_AND:
 503                case GREP_OPEN_PAREN:
 504                case GREP_CLOSE_PAREN:
 505                case GREP_NOT:
 506                case GREP_OR:
 507                        argv_array_push(&submodule_options, pattern->pattern);
 508                        break;
 509                /* BODY and HEAD are not used by git-grep */
 510                case GREP_PATTERN_BODY:
 511                case GREP_PATTERN_HEAD:
 512                        break;
 513                }
 514        }
 515
 516        /*
 517         * Limit number of threads for child process to use.
 518         * This is to prevent potential fork-bomb behavior of git-grep as each
 519         * submodule process has its own thread pool.
 520         */
 521        argv_array_pushf(&submodule_options, "--threads=%d",
 522                         (num_threads + 1) / 2);
 523
 524        /* Add Pathspecs */
 525        argv_array_push(&submodule_options, "--");
 526        for (i = 0; i < pathspec->nr; i++)
 527                argv_array_push(&submodule_options,
 528                                pathspec->items[i].original);
 529}
 530
 531/*
 532 * Launch child process to grep contents of a submodule
 533 */
 534static int grep_submodule_launch(struct grep_opt *opt,
 535                                 const struct grep_source *gs)
 536{
 537        struct child_process cp = CHILD_PROCESS_INIT;
 538        int status, i;
 539        const char *end_of_base;
 540        const char *name;
 541        struct strbuf child_output = STRBUF_INIT;
 542
 543        end_of_base = strchr(gs->name, ':');
 544        if (gs->identifier && end_of_base)
 545                name = end_of_base + 1;
 546        else
 547                name = gs->name;
 548
 549        prepare_submodule_repo_env(&cp.env_array);
 550        argv_array_push(&cp.env_array, GIT_DIR_ENVIRONMENT);
 551
 552        /* Add super prefix */
 553        argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
 554                         super_prefix ? super_prefix : "",
 555                         name);
 556        argv_array_push(&cp.args, "grep");
 557
 558        /*
 559         * Add basename of parent project
 560         * When performing grep on a tree object the filename is prefixed
 561         * with the object's name: 'tree-name:filename'.  In order to
 562         * provide uniformity of output we want to pass the name of the
 563         * parent project's object name to the submodule so the submodule can
 564         * prefix its output with the parent's name and not its own SHA1.
 565         */
 566        if (gs->identifier && end_of_base)
 567                argv_array_pushf(&cp.args, "--parent-basename=%.*s",
 568                                 (int) (end_of_base - gs->name),
 569                                 gs->name);
 570
 571        /* Add options */
 572        for (i = 0; i < submodule_options.argc; i++) {
 573                /*
 574                 * If there is a tree identifier for the submodule, add the
 575                 * rev after adding the submodule options but before the
 576                 * pathspecs.  To do this we listen for the '--' and insert the
 577                 * sha1 before pushing the '--' onto the child process argv
 578                 * array.
 579                 */
 580                if (gs->identifier &&
 581                    !strcmp("--", submodule_options.argv[i])) {
 582                        argv_array_push(&cp.args, sha1_to_hex(gs->identifier));
 583                }
 584
 585                argv_array_push(&cp.args, submodule_options.argv[i]);
 586        }
 587
 588        cp.git_cmd = 1;
 589        cp.dir = gs->path;
 590
 591        /*
 592         * Capture output to output buffer and check the return code from the
 593         * child process.  A '0' indicates a hit, a '1' indicates no hit and
 594         * anything else is an error.
 595         */
 596        status = capture_command(&cp, &child_output, 0);
 597        if (status && (status != 1)) {
 598                /* flush the buffer */
 599                write_or_die(1, child_output.buf, child_output.len);
 600                die("process for submodule '%s' failed with exit code: %d",
 601                    gs->name, status);
 602        }
 603
 604        opt->output(opt, child_output.buf, child_output.len);
 605        strbuf_release(&child_output);
 606        /* invert the return code to make a hit equal to 1 */
 607        return !status;
 608}
 609
 610/*
 611 * Prep grep structures for a submodule grep
 612 * sha1: the sha1 of the submodule or NULL if using the working tree
 613 * filename: name of the submodule including tree name of parent
 614 * path: location of the submodule
 615 */
 616static int grep_submodule(struct grep_opt *opt, const unsigned char *sha1,
 617                          const char *filename, const char *path)
 618{
 619        if (!is_submodule_initialized(path))
 620                return 0;
 621        if (!is_submodule_populated(path)) {
 622                /*
 623                 * If searching history, check for the presense of the
 624                 * submodule's gitdir before skipping the submodule.
 625                 */
 626                if (sha1) {
 627                        const struct submodule *sub =
 628                                        submodule_from_path(null_sha1, path);
 629                        if (sub)
 630                                path = git_path("modules/%s", sub->name);
 631
 632                        if (!(is_directory(path) && is_git_directory(path)))
 633                                return 0;
 634                } else {
 635                        return 0;
 636                }
 637        }
 638
 639#ifndef NO_PTHREADS
 640        if (num_threads) {
 641                add_work(opt, GREP_SOURCE_SUBMODULE, filename, path, sha1);
 642                return 0;
 643        } else
 644#endif
 645        {
 646                struct grep_source gs;
 647                int hit;
 648
 649                grep_source_init(&gs, GREP_SOURCE_SUBMODULE,
 650                                 filename, path, sha1);
 651                hit = grep_submodule_launch(opt, &gs);
 652
 653                grep_source_clear(&gs);
 654                return hit;
 655        }
 656}
 657
 658static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec,
 659                      int cached)
 660{
 661        int hit = 0;
 662        int nr;
 663        struct strbuf name = STRBUF_INIT;
 664        int name_base_len = 0;
 665        if (super_prefix) {
 666                name_base_len = strlen(super_prefix);
 667                strbuf_addstr(&name, super_prefix);
 668        }
 669
 670        read_cache();
 671
 672        for (nr = 0; nr < active_nr; nr++) {
 673                const struct cache_entry *ce = active_cache[nr];
 674                strbuf_setlen(&name, name_base_len);
 675                strbuf_addstr(&name, ce->name);
 676
 677                if (S_ISREG(ce->ce_mode) &&
 678                    match_pathspec(pathspec, name.buf, name.len, 0, NULL,
 679                                   S_ISDIR(ce->ce_mode) ||
 680                                   S_ISGITLINK(ce->ce_mode))) {
 681                        /*
 682                         * If CE_VALID is on, we assume worktree file and its
 683                         * cache entry are identical, even if worktree file has
 684                         * been modified, so use cache version instead
 685                         */
 686                        if (cached || (ce->ce_flags & CE_VALID) ||
 687                            ce_skip_worktree(ce)) {
 688                                if (ce_stage(ce) || ce_intent_to_add(ce))
 689                                        continue;
 690                                hit |= grep_sha1(opt, ce->oid.hash, ce->name,
 691                                                 0, ce->name);
 692                        } else {
 693                                hit |= grep_file(opt, ce->name);
 694                        }
 695                } else if (recurse_submodules && S_ISGITLINK(ce->ce_mode) &&
 696                           submodule_path_match(pathspec, name.buf, NULL)) {
 697                        hit |= grep_submodule(opt, NULL, ce->name, ce->name);
 698                } else {
 699                        continue;
 700                }
 701
 702                if (ce_stage(ce)) {
 703                        do {
 704                                nr++;
 705                        } while (nr < active_nr &&
 706                                 !strcmp(ce->name, active_cache[nr]->name));
 707                        nr--; /* compensate for loop control */
 708                }
 709                if (hit && opt->status_only)
 710                        break;
 711        }
 712
 713        strbuf_release(&name);
 714        return hit;
 715}
 716
 717static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 718                     struct tree_desc *tree, struct strbuf *base, int tn_len,
 719                     int check_attr)
 720{
 721        int hit = 0;
 722        enum interesting match = entry_not_interesting;
 723        struct name_entry entry;
 724        int old_baselen = base->len;
 725        struct strbuf name = STRBUF_INIT;
 726        int name_base_len = 0;
 727        if (super_prefix) {
 728                strbuf_addstr(&name, super_prefix);
 729                name_base_len = name.len;
 730        }
 731
 732        while (tree_entry(tree, &entry)) {
 733                int te_len = tree_entry_len(&entry);
 734
 735                if (match != all_entries_interesting) {
 736                        strbuf_addstr(&name, base->buf + tn_len);
 737                        match = tree_entry_interesting(&entry, &name,
 738                                                       0, pathspec);
 739                        strbuf_setlen(&name, name_base_len);
 740
 741                        if (match == all_entries_not_interesting)
 742                                break;
 743                        if (match == entry_not_interesting)
 744                                continue;
 745                }
 746
 747                strbuf_add(base, entry.path, te_len);
 748
 749                if (S_ISREG(entry.mode)) {
 750                        hit |= grep_sha1(opt, entry.oid->hash, base->buf, tn_len,
 751                                         check_attr ? base->buf + tn_len : NULL);
 752                } else if (S_ISDIR(entry.mode)) {
 753                        enum object_type type;
 754                        struct tree_desc sub;
 755                        void *data;
 756                        unsigned long size;
 757
 758                        data = lock_and_read_sha1_file(entry.oid->hash, &type, &size);
 759                        if (!data)
 760                                die(_("unable to read tree (%s)"),
 761                                    oid_to_hex(entry.oid));
 762
 763                        strbuf_addch(base, '/');
 764                        init_tree_desc(&sub, data, size);
 765                        hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
 766                                         check_attr);
 767                        free(data);
 768                } else if (recurse_submodules && S_ISGITLINK(entry.mode)) {
 769                        hit |= grep_submodule(opt, entry.oid->hash, base->buf,
 770                                              base->buf + tn_len);
 771                }
 772
 773                strbuf_setlen(base, old_baselen);
 774
 775                if (hit && opt->status_only)
 776                        break;
 777        }
 778
 779        strbuf_release(&name);
 780        return hit;
 781}
 782
 783static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 784                       struct object *obj, const char *name, const char *path)
 785{
 786        if (obj->type == OBJ_BLOB)
 787                return grep_sha1(opt, obj->oid.hash, name, 0, path);
 788        if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 789                struct tree_desc tree;
 790                void *data;
 791                unsigned long size;
 792                struct strbuf base;
 793                int hit, len;
 794
 795                grep_read_lock();
 796                data = read_object_with_reference(obj->oid.hash, tree_type,
 797                                                  &size, NULL);
 798                grep_read_unlock();
 799
 800                if (!data)
 801                        die(_("unable to read tree (%s)"), oid_to_hex(&obj->oid));
 802
 803                /* Use parent's name as base when recursing submodules */
 804                if (recurse_submodules && parent_basename)
 805                        name = parent_basename;
 806
 807                len = name ? strlen(name) : 0;
 808                strbuf_init(&base, PATH_MAX + len + 1);
 809                if (len) {
 810                        strbuf_add(&base, name, len);
 811                        strbuf_addch(&base, ':');
 812                }
 813                init_tree_desc(&tree, data, size);
 814                hit = grep_tree(opt, pathspec, &tree, &base, base.len,
 815                                obj->type == OBJ_COMMIT);
 816                strbuf_release(&base);
 817                free(data);
 818                return hit;
 819        }
 820        die(_("unable to grep from object of type %s"), typename(obj->type));
 821}
 822
 823static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 824                        const struct object_array *list)
 825{
 826        unsigned int i;
 827        int hit = 0;
 828        const unsigned int nr = list->nr;
 829
 830        for (i = 0; i < nr; i++) {
 831                struct object *real_obj;
 832                real_obj = deref_tag(list->objects[i].item, NULL, 0);
 833
 834                /* load the gitmodules file for this rev */
 835                if (recurse_submodules) {
 836                        submodule_free();
 837                        gitmodules_config_sha1(real_obj->oid.hash);
 838                }
 839                if (grep_object(opt, pathspec, real_obj, list->objects[i].name, list->objects[i].path)) {
 840                        hit = 1;
 841                        if (opt->status_only)
 842                                break;
 843                }
 844        }
 845        return hit;
 846}
 847
 848static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
 849                          int exc_std, int use_index)
 850{
 851        struct dir_struct dir;
 852        int i, hit = 0;
 853
 854        memset(&dir, 0, sizeof(dir));
 855        if (!use_index)
 856                dir.flags |= DIR_NO_GITLINKS;
 857        if (exc_std)
 858                setup_standard_excludes(&dir);
 859
 860        fill_directory(&dir, pathspec);
 861        for (i = 0; i < dir.nr; i++) {
 862                if (!dir_path_match(dir.entries[i], pathspec, 0, NULL))
 863                        continue;
 864                hit |= grep_file(opt, dir.entries[i]->name);
 865                if (hit && opt->status_only)
 866                        break;
 867        }
 868        return hit;
 869}
 870
 871static int context_callback(const struct option *opt, const char *arg,
 872                            int unset)
 873{
 874        struct grep_opt *grep_opt = opt->value;
 875        int value;
 876        const char *endp;
 877
 878        if (unset) {
 879                grep_opt->pre_context = grep_opt->post_context = 0;
 880                return 0;
 881        }
 882        value = strtol(arg, (char **)&endp, 10);
 883        if (*endp) {
 884                return error(_("switch `%c' expects a numerical value"),
 885                             opt->short_name);
 886        }
 887        grep_opt->pre_context = grep_opt->post_context = value;
 888        return 0;
 889}
 890
 891static int file_callback(const struct option *opt, const char *arg, int unset)
 892{
 893        struct grep_opt *grep_opt = opt->value;
 894        int from_stdin = !strcmp(arg, "-");
 895        FILE *patterns;
 896        int lno = 0;
 897        struct strbuf sb = STRBUF_INIT;
 898
 899        patterns = from_stdin ? stdin : fopen(arg, "r");
 900        if (!patterns)
 901                die_errno(_("cannot open '%s'"), arg);
 902        while (strbuf_getline(&sb, patterns) == 0) {
 903                /* ignore empty line like grep does */
 904                if (sb.len == 0)
 905                        continue;
 906
 907                append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
 908                                GREP_PATTERN);
 909        }
 910        if (!from_stdin)
 911                fclose(patterns);
 912        strbuf_release(&sb);
 913        return 0;
 914}
 915
 916static int not_callback(const struct option *opt, const char *arg, int unset)
 917{
 918        struct grep_opt *grep_opt = opt->value;
 919        append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 920        return 0;
 921}
 922
 923static int and_callback(const struct option *opt, const char *arg, int unset)
 924{
 925        struct grep_opt *grep_opt = opt->value;
 926        append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 927        return 0;
 928}
 929
 930static int open_callback(const struct option *opt, const char *arg, int unset)
 931{
 932        struct grep_opt *grep_opt = opt->value;
 933        append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 934        return 0;
 935}
 936
 937static int close_callback(const struct option *opt, const char *arg, int unset)
 938{
 939        struct grep_opt *grep_opt = opt->value;
 940        append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 941        return 0;
 942}
 943
 944static int pattern_callback(const struct option *opt, const char *arg,
 945                            int unset)
 946{
 947        struct grep_opt *grep_opt = opt->value;
 948        append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 949        return 0;
 950}
 951
 952int cmd_grep(int argc, const char **argv, const char *prefix)
 953{
 954        int hit = 0;
 955        int cached = 0, untracked = 0, opt_exclude = -1;
 956        int seen_dashdash = 0;
 957        int external_grep_allowed__ignored;
 958        const char *show_in_pager = NULL, *default_pager = "dummy";
 959        struct grep_opt opt;
 960        struct object_array list = OBJECT_ARRAY_INIT;
 961        struct pathspec pathspec;
 962        struct string_list path_list = STRING_LIST_INIT_NODUP;
 963        int i;
 964        int dummy;
 965        int use_index = 1;
 966        int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 967
 968        struct option options[] = {
 969                OPT_BOOL(0, "cached", &cached,
 970                        N_("search in index instead of in the work tree")),
 971                OPT_NEGBIT(0, "no-index", &use_index,
 972                         N_("find in contents not managed by git"), 1),
 973                OPT_BOOL(0, "untracked", &untracked,
 974                        N_("search in both tracked and untracked files")),
 975                OPT_SET_INT(0, "exclude-standard", &opt_exclude,
 976                            N_("ignore files specified via '.gitignore'"), 1),
 977                OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
 978                         N_("recursivley search in each submodule")),
 979                OPT_STRING(0, "parent-basename", &parent_basename,
 980                           N_("basename"),
 981                           N_("prepend parent project's basename to output")),
 982                OPT_GROUP(""),
 983                OPT_BOOL('v', "invert-match", &opt.invert,
 984                        N_("show non-matching lines")),
 985                OPT_BOOL('i', "ignore-case", &opt.ignore_case,
 986                        N_("case insensitive matching")),
 987                OPT_BOOL('w', "word-regexp", &opt.word_regexp,
 988                        N_("match patterns only at word boundaries")),
 989                OPT_SET_INT('a', "text", &opt.binary,
 990                        N_("process binary files as text"), GREP_BINARY_TEXT),
 991                OPT_SET_INT('I', NULL, &opt.binary,
 992                        N_("don't match patterns in binary files"),
 993                        GREP_BINARY_NOMATCH),
 994                OPT_BOOL(0, "textconv", &opt.allow_textconv,
 995                         N_("process binary files with textconv filters")),
 996                { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
 997                        N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
 998                        NULL, 1 },
 999                OPT_GROUP(""),
1000                OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
1001                            N_("use extended POSIX regular expressions"),
1002                            GREP_PATTERN_TYPE_ERE),
1003                OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
1004                            N_("use basic POSIX regular expressions (default)"),
1005                            GREP_PATTERN_TYPE_BRE),
1006                OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
1007                            N_("interpret patterns as fixed strings"),
1008                            GREP_PATTERN_TYPE_FIXED),
1009                OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
1010                            N_("use Perl-compatible regular expressions"),
1011                            GREP_PATTERN_TYPE_PCRE),
1012                OPT_GROUP(""),
1013                OPT_BOOL('n', "line-number", &opt.linenum, N_("show line numbers")),
1014                OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
1015                OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
1016                OPT_NEGBIT(0, "full-name", &opt.relative,
1017                        N_("show filenames relative to top directory"), 1),
1018                OPT_BOOL('l', "files-with-matches", &opt.name_only,
1019                        N_("show only filenames instead of matching lines")),
1020                OPT_BOOL(0, "name-only", &opt.name_only,
1021                        N_("synonym for --files-with-matches")),
1022                OPT_BOOL('L', "files-without-match",
1023                        &opt.unmatch_name_only,
1024                        N_("show only the names of files without match")),
1025                OPT_BOOL('z', "null", &opt.null_following_name,
1026                        N_("print NUL after filenames")),
1027                OPT_BOOL('c', "count", &opt.count,
1028                        N_("show the number of matches instead of matching lines")),
1029                OPT__COLOR(&opt.color, N_("highlight matches")),
1030                OPT_BOOL(0, "break", &opt.file_break,
1031                        N_("print empty line between matches from different files")),
1032                OPT_BOOL(0, "heading", &opt.heading,
1033                        N_("show filename only once above matches from same file")),
1034                OPT_GROUP(""),
1035                OPT_CALLBACK('C', "context", &opt, N_("n"),
1036                        N_("show <n> context lines before and after matches"),
1037                        context_callback),
1038                OPT_INTEGER('B', "before-context", &opt.pre_context,
1039                        N_("show <n> context lines before matches")),
1040                OPT_INTEGER('A', "after-context", &opt.post_context,
1041                        N_("show <n> context lines after matches")),
1042                OPT_INTEGER(0, "threads", &num_threads,
1043                        N_("use <n> worker threads")),
1044                OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
1045                        context_callback),
1046                OPT_BOOL('p', "show-function", &opt.funcname,
1047                        N_("show a line with the function name before matches")),
1048                OPT_BOOL('W', "function-context", &opt.funcbody,
1049                        N_("show the surrounding function")),
1050                OPT_GROUP(""),
1051                OPT_CALLBACK('f', NULL, &opt, N_("file"),
1052                        N_("read patterns from file"), file_callback),
1053                { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
1054                        N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
1055                { OPTION_CALLBACK, 0, "and", &opt, NULL,
1056                  N_("combine patterns specified with -e"),
1057                  PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
1058                OPT_BOOL(0, "or", &dummy, ""),
1059                { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
1060                  PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
1061                { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
1062                  PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1063                  open_callback },
1064                { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
1065                  PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
1066                  close_callback },
1067                OPT__QUIET(&opt.status_only,
1068                           N_("indicate hit with exit status without output")),
1069                OPT_BOOL(0, "all-match", &opt.all_match,
1070                        N_("show only matches from files that match all patterns")),
1071                { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
1072                  N_("show parse tree for grep expression"),
1073                  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
1074                OPT_GROUP(""),
1075                { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
1076                        N_("pager"), N_("show matching files in the pager"),
1077                        PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
1078                OPT_BOOL(0, "ext-grep", &external_grep_allowed__ignored,
1079                         N_("allow calling of grep(1) (ignored by this build)")),
1080                OPT_END()
1081        };
1082
1083        init_grep_defaults();
1084        git_config(grep_cmd_config, NULL);
1085        grep_init(&opt, prefix);
1086        super_prefix = get_super_prefix();
1087
1088        /*
1089         * If there is no -- then the paths must exist in the working
1090         * tree.  If there is no explicit pattern specified with -e or
1091         * -f, we take the first unrecognized non option to be the
1092         * pattern, but then what follows it must be zero or more
1093         * valid refs up to the -- (if exists), and then existing
1094         * paths.  If there is an explicit pattern, then the first
1095         * unrecognized non option is the beginning of the refs list
1096         * that continues up to the -- (if exists), and then paths.
1097         */
1098        argc = parse_options(argc, argv, prefix, options, grep_usage,
1099                             PARSE_OPT_KEEP_DASHDASH |
1100                             PARSE_OPT_STOP_AT_NON_OPTION);
1101        grep_commit_pattern_type(pattern_type_arg, &opt);
1102
1103        if (use_index && !startup_info->have_repository) {
1104                int fallback = 0;
1105                git_config_get_bool("grep.fallbacktonoindex", &fallback);
1106                if (fallback)
1107                        use_index = 0;
1108                else
1109                        /* die the same way as if we did it at the beginning */
1110                        setup_git_directory();
1111        }
1112
1113        /*
1114         * skip a -- separator; we know it cannot be
1115         * separating revisions from pathnames if
1116         * we haven't even had any patterns yet
1117         */
1118        if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
1119                argv++;
1120                argc--;
1121        }
1122
1123        /* First unrecognized non-option token */
1124        if (argc > 0 && !opt.pattern_list) {
1125                append_grep_pattern(&opt, argv[0], "command line", 0,
1126                                    GREP_PATTERN);
1127                argv++;
1128                argc--;
1129        }
1130
1131        if (show_in_pager == default_pager)
1132                show_in_pager = git_pager(1);
1133        if (show_in_pager) {
1134                opt.color = 0;
1135                opt.name_only = 1;
1136                opt.null_following_name = 1;
1137                opt.output_priv = &path_list;
1138                opt.output = append_path;
1139                string_list_append(&path_list, show_in_pager);
1140        }
1141
1142        if (!opt.pattern_list)
1143                die(_("no pattern given."));
1144        if (!opt.fixed && opt.ignore_case)
1145                opt.regflags |= REG_ICASE;
1146
1147        compile_grep_patterns(&opt);
1148
1149        /* Check revs and then paths */
1150        for (i = 0; i < argc; i++) {
1151                const char *arg = argv[i];
1152                unsigned char sha1[20];
1153                struct object_context oc;
1154                /* Is it a rev? */
1155                if (!get_sha1_with_context(arg, 0, sha1, &oc)) {
1156                        struct object *object = parse_object_or_die(sha1, arg);
1157                        if (!seen_dashdash)
1158                                verify_non_filename(prefix, arg);
1159                        add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
1160                        continue;
1161                }
1162                if (!strcmp(arg, "--")) {
1163                        i++;
1164                        seen_dashdash = 1;
1165                }
1166                break;
1167        }
1168
1169#ifndef NO_PTHREADS
1170        if (list.nr || cached || show_in_pager)
1171                num_threads = 0;
1172        else if (num_threads == 0)
1173                num_threads = GREP_NUM_THREADS_DEFAULT;
1174        else if (num_threads < 0)
1175                die(_("invalid number of threads specified (%d)"), num_threads);
1176#else
1177        num_threads = 0;
1178#endif
1179
1180#ifndef NO_PTHREADS
1181        if (num_threads) {
1182                if (!(opt.name_only || opt.unmatch_name_only || opt.count)
1183                    && (opt.pre_context || opt.post_context ||
1184                        opt.file_break || opt.funcbody))
1185                        skip_first_line = 1;
1186                start_threads(&opt);
1187        }
1188#endif
1189
1190        /* The rest are paths */
1191        if (!seen_dashdash) {
1192                int j;
1193                for (j = i; j < argc; j++)
1194                        verify_filename(prefix, argv[j], j == i);
1195        }
1196
1197        parse_pathspec(&pathspec, 0,
1198                       PATHSPEC_PREFER_CWD |
1199                       (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
1200                       prefix, argv + i);
1201        pathspec.max_depth = opt.max_depth;
1202        pathspec.recursive = 1;
1203
1204        if (recurse_submodules) {
1205                gitmodules_config();
1206                compile_submodule_options(&opt, &pathspec, cached, untracked,
1207                                          opt_exclude, use_index,
1208                                          pattern_type_arg);
1209        }
1210
1211        if (show_in_pager && (cached || list.nr))
1212                die(_("--open-files-in-pager only works on the worktree"));
1213
1214        if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1215                const char *pager = path_list.items[0].string;
1216                int len = strlen(pager);
1217
1218                if (len > 4 && is_dir_sep(pager[len - 5]))
1219                        pager += len - 4;
1220
1221                if (opt.ignore_case && !strcmp("less", pager))
1222                        string_list_append(&path_list, "-I");
1223
1224                if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1225                        struct strbuf buf = STRBUF_INIT;
1226                        strbuf_addf(&buf, "+/%s%s",
1227                                        strcmp("less", pager) ? "" : "*",
1228                                        opt.pattern_list->pattern);
1229                        string_list_append(&path_list, buf.buf);
1230                        strbuf_detach(&buf, NULL);
1231                }
1232        }
1233
1234        if (recurse_submodules && (!use_index || untracked))
1235                die(_("option not supported with --recurse-submodules."));
1236
1237        if (!show_in_pager && !opt.status_only)
1238                setup_pager();
1239
1240        if (!use_index && (untracked || cached))
1241                die(_("--cached or --untracked cannot be used with --no-index."));
1242
1243        if (!use_index || untracked) {
1244                int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1245                if (list.nr)
1246                        die(_("--no-index or --untracked cannot be used with revs."));
1247                hit = grep_directory(&opt, &pathspec, use_exclude, use_index);
1248        } else if (0 <= opt_exclude) {
1249                die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1250        } else if (!list.nr) {
1251                if (!cached)
1252                        setup_work_tree();
1253
1254                hit = grep_cache(&opt, &pathspec, cached);
1255        } else {
1256                if (cached)
1257                        die(_("both --cached and trees are given."));
1258                hit = grep_objects(&opt, &pathspec, &list);
1259        }
1260
1261        if (num_threads)
1262                hit |= wait_all();
1263        if (hit && show_in_pager)
1264                run_pager(&opt, prefix);
1265        free_grep_patterns(&opt);
1266        return !hit;
1267}