Re: [PATCH 3/3] grep: recurse in-process using 'struct repository'

> Convert grep to use 'struct repository' which enables recursing into
> submodules to be handled in-process.
>
> Signed-off-by: Brandon Williams <bmwill@google.com>
> ---
>  Documentation/git-grep.txt |   7 -
>  builtin/grep.c             | 390 +++++++++------------------------------------
>  cache.h                    |   1 -
>  git.c                      |   2 +-
>  grep.c                     |  13 --
>  grep.h                     |   1 -
>  setup.c                    |  12 +-
>  7 files changed, 81 insertions(+), 345 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..0b0a8459e 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);
> @@ -366,14 +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);
> +               quote_path_relative(filename, opt->prefix, &buf);
> +       } else {
> +               strbuf_addstr(&buf, filename);
>         }
>
>  #ifndef NO_PTHREADS
> @@ -421,284 +400,80 @@ 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;
> -
> -       prepare_submodule_repo_env(&cp.env_array);
> -       argv_array_push(&cp.env_array, GIT_DIR_ENVIRONMENT);
> -
> -       if (opt->relative && opt->prefix_length)
> -               argv_array_pushf(&cp.env_array, "%s=%s",
> -                                GIT_TOPLEVEL_PREFIX_ENVIRONMENT,
> -                                opt->prefix);
> -
> -       /* Add super prefix */
> -       argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
> -                        super_prefix ? super_prefix : "",
> -                        name);
> -       argv_array_push(&cp.args, "grep");
> +       struct repository submodule;
> +       int hit;
>
> -       /*
> -        * 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.
> -        */
> -       if (gs->identifier && end_of_base)
> -               argv_array_pushf(&cp.args, "--parent-basename=%.*s",
> -                                (int) (end_of_base - gs->name),
> -                                gs->name);
> +       if (!is_submodule_active(superproject, path))
> +               return 0;
>
> -       /* 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 (repo_submodule_init(&submodule, superproject, path))
> +               return 0;
>
> -               argv_array_push(&cp.args, submodule_options.argv[i]);
> -       }
> +       repo_read_gitmodules(&submodule);
>
> -       cp.git_cmd = 1;
> -       cp.dir = gs->path;
> +       /* add objects to alternates */
> +       add_to_alternates_memory(submodule.objectdir);
>
> -       /*
> -        * 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 (oid) {
> +               struct object *object;
> +               struct tree_desc tree;
> +               void *data;
> +               unsigned long size;
> +               struct strbuf base = STRBUF_INIT;
>
> -       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;
> -}
> +               object = parse_object_or_die(oid, oid_to_hex(oid));
>
> -/*
> - * 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;
> -               }
> -       }
> +               grep_read_lock();
> +               data = read_object_with_reference(object->oid.hash, tree_type,
> +                                                 &size, NULL);
> +               grep_read_unlock();
>
> -#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;
> +               if (!data)
> +                       die(_("unable to read tree (%s)"), oid_to_hex(&object->oid));
>
> -               grep_source_init(&gs, GREP_SOURCE_SUBMODULE,
> -                                filename, path, oid);
> -               hit = grep_submodule_launch(opt, &gs);
> +               strbuf_addstr(&base, filename);
> +               strbuf_addch(&base, '/');
>
> -               grep_source_clear(&gs);
> -               return hit;
> +               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);
>         }
> +
> +       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 +490,14 @@ 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 +505,8 @@ 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 +519,7 @@ 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 +527,8 @@ 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 +566,11 @@ 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 +584,8 @@ 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 +604,6 @@ 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 +612,7 @@ 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 +621,7 @@ 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 +637,8 @@ 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 +779,6 @@ 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 +883,6 @@ 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 +1044,6 @@ 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 +1087,12 @@ 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 b370bf3c1..27266b0ac 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
>