[WIP PATCH 12/26] grep: move up gitdir setup to run_builtin()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

grep has USE_PAGER set. setup_pager() may read config even
setup_git_dir* is not run yet. When the config path is required,
setup_git_env() plays hero and set gitdir to ".git". Shortly after,
setup_git_dir* is run inside cmd_shortlog() and may move gitdir
to somewhere else.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin-grep.c  |    9 +++------
 git.c           |    2 +-
 t/t7002-grep.sh |    2 ++
 3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/builtin-grep.c b/builtin-grep.c
index 46ffc1d..84c05e0 100644
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -758,7 +758,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	const char **paths = NULL;
 	int i;
 	int dummy;
-	int nongit = 0, use_index = 1;
+	int use_index = 1;
 	struct option options[] = {
 		OPT_BOOLEAN(0, "cached", &cached,
 			"search in index instead of in the work tree"),
@@ -846,8 +846,6 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
-	prefix = setup_git_directory_gently(&nongit);
-
 	/*
 	 * 'git grep -h', unlike 'git grep -h <pattern>', is a request
 	 * to show usage information and exit.
@@ -885,9 +883,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 			     PARSE_OPT_STOP_AT_NON_OPTION |
 			     PARSE_OPT_NO_INTERNAL_HELP);
 
-	if (use_index && nongit)
-		/* die the same way as if we did it at the beginning */
-		setup_git_directory();
+	if (use_index && !startup_info->have_repository)
+		die("No git repository found");
 
 	/*
 	 * skip a -- separator; we know it cannot be
diff --git a/git.c b/git.c
index c7af80e..3462b49 100644
--- a/git.c
+++ b/git.c
@@ -339,7 +339,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "fsck-objects", cmd_fsck, RUN_SETUP },
 		{ "gc", cmd_gc, RUN_SETUP },
 		{ "get-tar-commit-id", cmd_get_tar_commit_id },
-		{ "grep", cmd_grep, USE_PAGER },
+		{ "grep", cmd_grep, RUN_SETUP_GENTLY | USE_PAGER },
 		{ "hash-object", cmd_hash_object, RUN_SETUP_GENTLY },
 		{ "help", cmd_help },
 		{ "index-pack", cmd_index_pack },
diff --git a/t/t7002-grep.sh b/t/t7002-grep.sh
index ebae152..67afb42 100755
--- a/t/t7002-grep.sh
+++ b/t/t7002-grep.sh
@@ -8,6 +8,8 @@ test_description='git grep various.
 
 . ./test-lib.sh
 
+export GIT_HARDENED_SETUP=1
+
 cat >hello.c <<EOF
 #include <stdio.h>
 int main(int argc, const char **argv)
-- 
1.7.0.195.g637a2