Convert grep to use 'struct repository' which enables recursing into
submodules to be handled in-process.

Signed-off-by: Brandon Williams <bmw...@google.com>
---
 Documentation/git-grep.txt |   7 -
 builtin/grep.c             | 396 ++++++++++-----------------------------------
 cache.h                    |   1 -
 git.c                      |   2 +-
 grep.c                     |  13 --
 grep.h                     |   1 -
 setup.c                    |  12 +-
 7 files changed, 88 insertions(+), 344 deletions(-)

diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index 5033483db..720c7850e 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -95,13 +95,6 @@ OPTIONS
        <tree> option the prefix of all submodule output will be the name of
        the parent project's <tree> object.
 
---parent-basename <basename>::
-       For internal use only.  In order to produce uniform output with the
-       --recurse-submodules option, this option can be used to provide the
-       basename of a parent's <tree> object to a submodule so the submodule
-       can prefix its output with the parent's name rather than the SHA1 of
-       the submodule.
-
 -a::
 --text::
        Process binary files as if they were text.
diff --git a/builtin/grep.c b/builtin/grep.c
index fa351c49f..728755d6d 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -28,13 +28,7 @@ static char const * const grep_usage[] = {
        NULL
 };
 
-static const char *super_prefix;
 static int recurse_submodules;
-static struct argv_array submodule_options = ARGV_ARRAY_INIT;
-static const char *parent_basename;
-
-static int grep_submodule_launch(struct grep_opt *opt,
-                                const struct grep_source *gs);
 
 #define GREP_NUM_THREADS_DEFAULT 8
 static int num_threads;
@@ -186,10 +180,7 @@ static void *run(void *arg)
                        break;
 
                opt->output_priv = w;
-               if (w->source.type == GREP_SOURCE_SUBMODULE)
-                       hit |= grep_submodule_launch(opt, &w->source);
-               else
-                       hit |= grep_source(opt, &w->source);
+               hit |= grep_source(opt, &w->source);
                grep_source_clear_data(&w->source);
                work_done(w);
        }
@@ -327,21 +318,13 @@ static int grep_oid(struct grep_opt *opt, const struct 
object_id *oid,
 {
        struct strbuf pathbuf = STRBUF_INIT;
 
-       if (super_prefix) {
-               strbuf_add(&pathbuf, filename, tree_name_len);
-               strbuf_addstr(&pathbuf, super_prefix);
-               strbuf_addstr(&pathbuf, filename + tree_name_len);
+       if (opt->relative && opt->prefix_length) {
+               quote_path_relative(filename + tree_name_len, opt->prefix, 
&pathbuf);
+               strbuf_insert(&pathbuf, 0, filename, tree_name_len);
        } else {
                strbuf_addstr(&pathbuf, filename);
        }
 
-       if (opt->relative && opt->prefix_length) {
-               char *name = strbuf_detach(&pathbuf, NULL);
-               quote_path_relative(name + tree_name_len, opt->prefix, 
&pathbuf);
-               strbuf_insert(&pathbuf, 0, name, tree_name_len);
-               free(name);
-       }
-
 #ifndef NO_PTHREADS
        if (num_threads) {
                add_work(opt, GREP_SOURCE_OID, pathbuf.buf, path, oid);
@@ -366,15 +349,10 @@ static int grep_file(struct grep_opt *opt, const char 
*filename)
 {
        struct strbuf buf = STRBUF_INIT;
 
-       if (super_prefix)
-               strbuf_addstr(&buf, super_prefix);
-       strbuf_addstr(&buf, filename);
-
-       if (opt->relative && opt->prefix_length) {
-               char *name = strbuf_detach(&buf, NULL);
-               quote_path_relative(name, opt->prefix, &buf);
-               free(name);
-       }
+       if (opt->relative && opt->prefix_length)
+               quote_path_relative(filename, opt->prefix, &buf);
+       else
+               strbuf_addstr(&buf, filename);
 
 #ifndef NO_PTHREADS
        if (num_threads) {
@@ -421,284 +399,89 @@ static void run_pager(struct grep_opt *opt, const char 
*prefix)
                exit(status);
 }
 
-static void compile_submodule_options(const struct grep_opt *opt,
-                                     const char **argv,
-                                     int cached, int untracked,
-                                     int opt_exclude, int use_index,
-                                     int pattern_type_arg)
-{
-       struct grep_pat *pattern;
-
-       if (recurse_submodules)
-               argv_array_push(&submodule_options, "--recurse-submodules");
-
-       if (cached)
-               argv_array_push(&submodule_options, "--cached");
-       if (!use_index)
-               argv_array_push(&submodule_options, "--no-index");
-       if (untracked)
-               argv_array_push(&submodule_options, "--untracked");
-       if (opt_exclude > 0)
-               argv_array_push(&submodule_options, "--exclude-standard");
-
-       if (opt->invert)
-               argv_array_push(&submodule_options, "-v");
-       if (opt->ignore_case)
-               argv_array_push(&submodule_options, "-i");
-       if (opt->word_regexp)
-               argv_array_push(&submodule_options, "-w");
-       switch (opt->binary) {
-       case GREP_BINARY_NOMATCH:
-               argv_array_push(&submodule_options, "-I");
-               break;
-       case GREP_BINARY_TEXT:
-               argv_array_push(&submodule_options, "-a");
-               break;
-       default:
-               break;
-       }
-       if (opt->allow_textconv)
-               argv_array_push(&submodule_options, "--textconv");
-       if (opt->max_depth != -1)
-               argv_array_pushf(&submodule_options, "--max-depth=%d",
-                                opt->max_depth);
-       if (opt->linenum)
-               argv_array_push(&submodule_options, "-n");
-       if (!opt->pathname)
-               argv_array_push(&submodule_options, "-h");
-       if (!opt->relative)
-               argv_array_push(&submodule_options, "--full-name");
-       if (opt->name_only)
-               argv_array_push(&submodule_options, "-l");
-       if (opt->unmatch_name_only)
-               argv_array_push(&submodule_options, "-L");
-       if (opt->null_following_name)
-               argv_array_push(&submodule_options, "-z");
-       if (opt->count)
-               argv_array_push(&submodule_options, "-c");
-       if (opt->file_break)
-               argv_array_push(&submodule_options, "--break");
-       if (opt->heading)
-               argv_array_push(&submodule_options, "--heading");
-       if (opt->pre_context)
-               argv_array_pushf(&submodule_options, "--before-context=%d",
-                                opt->pre_context);
-       if (opt->post_context)
-               argv_array_pushf(&submodule_options, "--after-context=%d",
-                                opt->post_context);
-       if (opt->funcname)
-               argv_array_push(&submodule_options, "-p");
-       if (opt->funcbody)
-               argv_array_push(&submodule_options, "-W");
-       if (opt->all_match)
-               argv_array_push(&submodule_options, "--all-match");
-       if (opt->debug)
-               argv_array_push(&submodule_options, "--debug");
-       if (opt->status_only)
-               argv_array_push(&submodule_options, "-q");
-
-       switch (pattern_type_arg) {
-       case GREP_PATTERN_TYPE_BRE:
-               argv_array_push(&submodule_options, "-G");
-               break;
-       case GREP_PATTERN_TYPE_ERE:
-               argv_array_push(&submodule_options, "-E");
-               break;
-       case GREP_PATTERN_TYPE_FIXED:
-               argv_array_push(&submodule_options, "-F");
-               break;
-       case GREP_PATTERN_TYPE_PCRE:
-               argv_array_push(&submodule_options, "-P");
-               break;
-       case GREP_PATTERN_TYPE_UNSPECIFIED:
-               break;
-       default:
-               die("BUG: Added a new grep pattern type without updating switch 
statement");
-       }
-
-       for (pattern = opt->pattern_list; pattern != NULL;
-            pattern = pattern->next) {
-               switch (pattern->token) {
-               case GREP_PATTERN:
-                       argv_array_pushf(&submodule_options, "-e%s",
-                                        pattern->pattern);
-                       break;
-               case GREP_AND:
-               case GREP_OPEN_PAREN:
-               case GREP_CLOSE_PAREN:
-               case GREP_NOT:
-               case GREP_OR:
-                       argv_array_push(&submodule_options, pattern->pattern);
-                       break;
-               /* BODY and HEAD are not used by git-grep */
-               case GREP_PATTERN_BODY:
-               case GREP_PATTERN_HEAD:
-                       break;
-               }
-       }
-
-       /*
-        * Limit number of threads for child process to use.
-        * This is to prevent potential fork-bomb behavior of git-grep as each
-        * submodule process has its own thread pool.
-        */
-       argv_array_pushf(&submodule_options, "--threads=%d",
-                        (num_threads + 1) / 2);
-
-       /* Add Pathspecs */
-       argv_array_push(&submodule_options, "--");
-       for (; *argv; argv++)
-               argv_array_push(&submodule_options, *argv);
-}
+static int grep_cache(struct grep_opt *opt, struct repository *repo,
+                     const struct pathspec *pathspec, int cached);
+static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
+                    struct tree_desc *tree, struct strbuf *base, int tn_len,
+                    int check_attr, struct repository *repo);
 
-/*
- * Launch child process to grep contents of a submodule
- */
-static int grep_submodule_launch(struct grep_opt *opt,
-                                const struct grep_source *gs)
+static int grep_submodule(struct grep_opt *opt, struct repository 
*superproject,
+                         const struct pathspec *pathspec,
+                         const struct object_id *oid,
+                         const char *filename, const char *path)
 {
-       struct child_process cp = CHILD_PROCESS_INIT;
-       int status, i;
-       const char *end_of_base;
-       const char *name;
-       struct strbuf child_output = STRBUF_INIT;
-
-       end_of_base = strchr(gs->name, ':');
-       if (gs->identifier && end_of_base)
-               name = end_of_base + 1;
-       else
-               name = gs->name;
+       struct repository submodule;
+       int hit;
 
-       prepare_submodule_repo_env(&cp.env_array);
-       argv_array_push(&cp.env_array, GIT_DIR_ENVIRONMENT);
+       if (!is_submodule_active(superproject, path))
+               return 0;
 
-       if (opt->relative && opt->prefix_length)
-               argv_array_pushf(&cp.env_array, "%s=%s",
-                                GIT_TOPLEVEL_PREFIX_ENVIRONMENT,
-                                opt->prefix);
+       if (repo_submodule_init(&submodule, superproject, path))
+               return 0;
 
-       /* Add super prefix */
-       argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
-                        super_prefix ? super_prefix : "",
-                        name);
-       argv_array_push(&cp.args, "grep");
+       repo_read_gitmodules(&submodule);
 
        /*
-        * Add basename of parent project
-        * When performing grep on a tree object the filename is prefixed
-        * with the object's name: 'tree-name:filename'.  In order to
-        * provide uniformity of output we want to pass the name of the
-        * parent project's object name to the submodule so the submodule can
-        * prefix its output with the parent's name and not its own OID.
+        * NEEDSWORK: This adds the submodule's object directory to the list of
+        * alternates for the single in-memory object store.  This has some bad
+        * consequences for memory (processed objects will never be freed) and
+        * performance (this increases the number of pack files git has to pay
+        * attention to, to the sum of the number of pack files in all the
+        * repositories processed so far).  This can be removed once the object
+        * store is no longer global and instead is a member of the repository
+        * object.
         */
-       if (gs->identifier && end_of_base)
-               argv_array_pushf(&cp.args, "--parent-basename=%.*s",
-                                (int) (end_of_base - gs->name),
-                                gs->name);
+       add_to_alternates_memory(submodule.objectdir);
 
-       /* Add options */
-       for (i = 0; i < submodule_options.argc; i++) {
-               /*
-                * If there is a tree identifier for the submodule, add the
-                * rev after adding the submodule options but before the
-                * pathspecs.  To do this we listen for the '--' and insert the
-                * oid before pushing the '--' onto the child process argv
-                * array.
-                */
-               if (gs->identifier &&
-                   !strcmp("--", submodule_options.argv[i])) {
-                       argv_array_push(&cp.args, oid_to_hex(gs->identifier));
-               }
+       if (oid) {
+               struct object *object;
+               struct tree_desc tree;
+               void *data;
+               unsigned long size;
+               struct strbuf base = STRBUF_INIT;
 
-               argv_array_push(&cp.args, submodule_options.argv[i]);
-       }
+               object = parse_object_or_die(oid, oid_to_hex(oid));
 
-       cp.git_cmd = 1;
-       cp.dir = gs->path;
+               grep_read_lock();
+               data = read_object_with_reference(object->oid.hash, tree_type,
+                                                 &size, NULL);
+               grep_read_unlock();
 
-       /*
-        * Capture output to output buffer and check the return code from the
-        * child process.  A '0' indicates a hit, a '1' indicates no hit and
-        * anything else is an error.
-        */
-       status = capture_command(&cp, &child_output, 0);
-       if (status && (status != 1)) {
-               /* flush the buffer */
-               write_or_die(1, child_output.buf, child_output.len);
-               die("process for submodule '%s' failed with exit code: %d",
-                   gs->name, status);
-       }
+               if (!data)
+                       die(_("unable to read tree (%s)"), 
oid_to_hex(&object->oid));
 
-       opt->output(opt, child_output.buf, child_output.len);
-       strbuf_release(&child_output);
-       /* invert the return code to make a hit equal to 1 */
-       return !status;
-}
+               strbuf_addstr(&base, filename);
+               strbuf_addch(&base, '/');
 
-/*
- * Prep grep structures for a submodule grep
- * oid: the oid of the submodule or NULL if using the working tree
- * filename: name of the submodule including tree name of parent
- * path: location of the submodule
- */
-static int grep_submodule(struct grep_opt *opt, const struct object_id *oid,
-                         const char *filename, const char *path)
-{
-       if (!is_submodule_active(the_repository, path))
-               return 0;
-       if (!is_submodule_populated_gently(path, NULL)) {
-               /*
-                * If searching history, check for the presence of the
-                * submodule's gitdir before skipping the submodule.
-                */
-               if (oid) {
-                       const struct submodule *sub =
-                                       submodule_from_path(null_sha1, path);
-                       if (sub)
-                               path = git_path("modules/%s", sub->name);
-
-                       if (!(is_directory(path) && is_git_directory(path)))
-                               return 0;
-               } else {
-                       return 0;
-               }
+               init_tree_desc(&tree, data, size);
+               hit = grep_tree(opt, pathspec, &tree, &base, base.len,
+                               object->type == OBJ_COMMIT, &submodule);
+               strbuf_release(&base);
+               free(data);
+       } else {
+               hit = grep_cache(opt, &submodule, pathspec, 1);
        }
 
-#ifndef NO_PTHREADS
-       if (num_threads) {
-               add_work(opt, GREP_SOURCE_SUBMODULE, filename, path, oid);
-               return 0;
-       } else
-#endif
-       {
-               struct grep_source gs;
-               int hit;
-
-               grep_source_init(&gs, GREP_SOURCE_SUBMODULE,
-                                filename, path, oid);
-               hit = grep_submodule_launch(opt, &gs);
-
-               grep_source_clear(&gs);
-               return hit;
-       }
+       repo_clear(&submodule);
+       return hit;
 }
 
-static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec,
-                     int cached)
+static int grep_cache(struct grep_opt *opt, struct repository *repo,
+                     const struct pathspec *pathspec, int cached)
 {
        int hit = 0;
        int nr;
        struct strbuf name = STRBUF_INIT;
        int name_base_len = 0;
-       if (super_prefix) {
-               name_base_len = strlen(super_prefix);
-               strbuf_addstr(&name, super_prefix);
+       if (repo->submodule_prefix) {
+               name_base_len = strlen(repo->submodule_prefix);
+               strbuf_addstr(&name, repo->submodule_prefix);
        }
 
-       read_cache();
+       repo_read_index(repo);
 
-       for (nr = 0; nr < active_nr; nr++) {
-               const struct cache_entry *ce = active_cache[nr];
+       for (nr = 0; nr < repo->index->cache_nr; nr++) {
+               const struct cache_entry *ce = repo->index->cache[nr];
                strbuf_setlen(&name, name_base_len);
                strbuf_addstr(&name, ce->name);
 
@@ -715,14 +498,14 @@ static int grep_cache(struct grep_opt *opt, const struct 
pathspec *pathspec,
                            ce_skip_worktree(ce)) {
                                if (ce_stage(ce) || ce_intent_to_add(ce))
                                        continue;
-                               hit |= grep_oid(opt, &ce->oid, ce->name,
-                                                0, ce->name);
+                               hit |= grep_oid(opt, &ce->oid, name.buf,
+                                                0, name.buf);
                        } else {
-                               hit |= grep_file(opt, ce->name);
+                               hit |= grep_file(opt, name.buf);
                        }
                } else if (recurse_submodules && S_ISGITLINK(ce->ce_mode) &&
                           submodule_path_match(pathspec, name.buf, NULL)) {
-                       hit |= grep_submodule(opt, NULL, ce->name, ce->name);
+                       hit |= grep_submodule(opt, repo, pathspec, NULL, 
ce->name, ce->name);
                } else {
                        continue;
                }
@@ -730,8 +513,8 @@ static int grep_cache(struct grep_opt *opt, const struct 
pathspec *pathspec,
                if (ce_stage(ce)) {
                        do {
                                nr++;
-                       } while (nr < active_nr &&
-                                !strcmp(ce->name, active_cache[nr]->name));
+                       } while (nr < repo->index->cache_nr &&
+                                !strcmp(ce->name, 
repo->index->cache[nr]->name));
                        nr--; /* compensate for loop control */
                }
                if (hit && opt->status_only)
@@ -744,7 +527,7 @@ static int grep_cache(struct grep_opt *opt, const struct 
pathspec *pathspec,
 
 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
                     struct tree_desc *tree, struct strbuf *base, int tn_len,
-                    int check_attr)
+                    int check_attr, struct repository *repo)
 {
        int hit = 0;
        enum interesting match = entry_not_interesting;
@@ -752,8 +535,8 @@ static int grep_tree(struct grep_opt *opt, const struct 
pathspec *pathspec,
        int old_baselen = base->len;
        struct strbuf name = STRBUF_INIT;
        int name_base_len = 0;
-       if (super_prefix) {
-               strbuf_addstr(&name, super_prefix);
+       if (repo->submodule_prefix) {
+               strbuf_addstr(&name, repo->submodule_prefix);
                name_base_len = name.len;
        }
 
@@ -791,11 +574,11 @@ static int grep_tree(struct grep_opt *opt, const struct 
pathspec *pathspec,
                        strbuf_addch(base, '/');
                        init_tree_desc(&sub, data, size);
                        hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
-                                        check_attr);
+                                        check_attr, repo);
                        free(data);
                } else if (recurse_submodules && S_ISGITLINK(entry.mode)) {
-                       hit |= grep_submodule(opt, entry.oid, base->buf,
-                                             base->buf + tn_len);
+                       hit |= grep_submodule(opt, repo, pathspec, entry.oid,
+                                             base->buf, base->buf + tn_len);
                }
 
                strbuf_setlen(base, old_baselen);
@@ -809,7 +592,8 @@ static int grep_tree(struct grep_opt *opt, const struct 
pathspec *pathspec,
 }
 
 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
-                      struct object *obj, const char *name, const char *path)
+                      struct object *obj, const char *name, const char *path,
+                      struct repository *repo)
 {
        if (obj->type == OBJ_BLOB)
                return grep_oid(opt, &obj->oid, name, 0, path);
@@ -828,10 +612,6 @@ static int grep_object(struct grep_opt *opt, const struct 
pathspec *pathspec,
                if (!data)
                        die(_("unable to read tree (%s)"), 
oid_to_hex(&obj->oid));
 
-               /* Use parent's name as base when recursing submodules */
-               if (recurse_submodules && parent_basename)
-                       name = parent_basename;
-
                len = name ? strlen(name) : 0;
                strbuf_init(&base, PATH_MAX + len + 1);
                if (len) {
@@ -840,7 +620,7 @@ static int grep_object(struct grep_opt *opt, const struct 
pathspec *pathspec,
                }
                init_tree_desc(&tree, data, size);
                hit = grep_tree(opt, pathspec, &tree, &base, base.len,
-                               obj->type == OBJ_COMMIT);
+                               obj->type == OBJ_COMMIT, repo);
                strbuf_release(&base);
                free(data);
                return hit;
@@ -849,6 +629,7 @@ static int grep_object(struct grep_opt *opt, const struct 
pathspec *pathspec,
 }
 
 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
+                       struct repository *repo,
                        const struct object_array *list)
 {
        unsigned int i;
@@ -864,7 +645,8 @@ static int grep_objects(struct grep_opt *opt, const struct 
pathspec *pathspec,
                        submodule_free();
                        gitmodules_config_sha1(real_obj->oid.hash);
                }
-               if (grep_object(opt, pathspec, real_obj, list->objects[i].name, 
list->objects[i].path)) {
+               if (grep_object(opt, pathspec, real_obj, list->objects[i].name, 
list->objects[i].path,
+                               repo)) {
                        hit = 1;
                        if (opt->status_only)
                                break;
@@ -1005,9 +787,6 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
                            N_("ignore files specified via '.gitignore'"), 1),
                OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
                         N_("recursively search in each submodule")),
-               OPT_STRING(0, "parent-basename", &parent_basename,
-                          N_("basename"),
-                          N_("prepend parent project's basename to output")),
                OPT_GROUP(""),
                OPT_BOOL('v', "invert-match", &opt.invert,
                        N_("show non-matching lines")),
@@ -1112,7 +891,6 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
        init_grep_defaults();
        git_config(grep_cmd_config, NULL);
        grep_init(&opt, prefix);
-       super_prefix = get_super_prefix();
 
        /*
         * If there is no -- then the paths must exist in the working
@@ -1274,9 +1052,6 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
 
        if (recurse_submodules) {
                gitmodules_config();
-               compile_submodule_options(&opt, argv + i, cached, untracked,
-                                         opt_exclude, use_index,
-                                         pattern_type_arg);
        }
 
        if (show_in_pager && (cached || list.nr))
@@ -1320,11 +1095,12 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
                if (!cached)
                        setup_work_tree();
 
-               hit = grep_cache(&opt, &pathspec, cached);
+               hit = grep_cache(&opt, the_repository, &pathspec, cached);
        } else {
                if (cached)
                        die(_("both --cached and trees are given."));
-               hit = grep_objects(&opt, &pathspec, &list);
+
+               hit = grep_objects(&opt, &pathspec, the_repository, &list);
        }
 
        if (num_threads)
diff --git a/cache.h b/cache.h
index 71fe09264..71af91c43 100644
--- a/cache.h
+++ b/cache.h
@@ -417,7 +417,6 @@ static inline enum object_type object_type(unsigned int 
mode)
 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 #define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
 #define GIT_SUPER_PREFIX_ENVIRONMENT "GIT_INTERNAL_SUPER_PREFIX"
-#define GIT_TOPLEVEL_PREFIX_ENVIRONMENT "GIT_INTERNAL_TOPLEVEL_PREFIX"
 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
diff --git a/git.c b/git.c
index 489aab4d8..9dd9aead6 100644
--- a/git.c
+++ b/git.c
@@ -392,7 +392,7 @@ static struct cmd_struct commands[] = {
        { "fsck-objects", cmd_fsck, RUN_SETUP },
        { "gc", cmd_gc, RUN_SETUP },
        { "get-tar-commit-id", cmd_get_tar_commit_id },
-       { "grep", cmd_grep, RUN_SETUP_GENTLY | SUPPORT_SUPER_PREFIX },
+       { "grep", cmd_grep, RUN_SETUP_GENTLY },
        { "hash-object", cmd_hash_object },
        { "help", cmd_help },
        { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
diff --git a/grep.c b/grep.c
index 98733db62..78680da5c 100644
--- a/grep.c
+++ b/grep.c
@@ -1919,16 +1919,6 @@ void grep_source_init(struct grep_source *gs, enum 
grep_source_type type,
        case GREP_SOURCE_FILE:
                gs->identifier = xstrdup(identifier);
                break;
-       case GREP_SOURCE_SUBMODULE:
-               if (!identifier) {
-                       gs->identifier = NULL;
-                       break;
-               }
-               /*
-                * FALL THROUGH
-                * If the identifier is non-NULL (in the submodule case) it
-                * will be a SHA1 that needs to be copied.
-                */
        case GREP_SOURCE_OID:
                gs->identifier = oiddup(identifier);
                break;
@@ -1951,7 +1941,6 @@ void grep_source_clear_data(struct grep_source *gs)
        switch (gs->type) {
        case GREP_SOURCE_FILE:
        case GREP_SOURCE_OID:
-       case GREP_SOURCE_SUBMODULE:
                FREE_AND_NULL(gs->buf);
                gs->size = 0;
                break;
@@ -2022,8 +2011,6 @@ static int grep_source_load(struct grep_source *gs)
                return grep_source_load_oid(gs);
        case GREP_SOURCE_BUF:
                return gs->buf ? 0 : -1;
-       case GREP_SOURCE_SUBMODULE:
-               break;
        }
        die("BUG: invalid grep_source type to load");
 }
diff --git a/grep.h b/grep.h
index b8f93bfc2..d405e568f 100644
--- a/grep.h
+++ b/grep.h
@@ -194,7 +194,6 @@ struct grep_source {
                GREP_SOURCE_OID,
                GREP_SOURCE_FILE,
                GREP_SOURCE_BUF,
-               GREP_SOURCE_SUBMODULE,
        } type;
        void *identifier;
 
diff --git a/setup.c b/setup.c
index 860507e1f..23950173f 100644
--- a/setup.c
+++ b/setup.c
@@ -1027,7 +1027,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
 {
        static struct strbuf cwd = STRBUF_INIT;
        struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
-       const char *prefix, *env_prefix;
+       const char *prefix;
 
        /*
         * We may have read an incomplete configuration before
@@ -1085,16 +1085,6 @@ const char *setup_git_directory_gently(int *nongit_ok)
                die("BUG: unhandled setup_git_directory_1() result");
        }
 
-       /*
-        * NEEDSWORK: This was a hack in order to get ls-files and grep to have
-        * properly formated output when recursing submodules.  Once ls-files
-        * and grep have been changed to perform this recursing in-process this
-        * needs to be removed.
-        */
-       env_prefix = getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);
-       if (env_prefix)
-               prefix = env_prefix;
-
        if (prefix)
                setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
        else
-- 
2.13.2.932.g7449e964c-goog

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