[PATCH 1/2] t7002: set test prerequisite "external-grep" if supported

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

Add another test to set prerequisite "external-grep" if the current
build supports external grep. This can be used to skip external grep
only tests on builds that do not support this optimization.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 t/t7002-grep.sh |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/t/t7002-grep.sh b/t/t7002-grep.sh
index abd14bf..ffda0df 100755
--- a/t/t7002-grep.sh
+++ b/t/t7002-grep.sh
@@ -8,6 +8,18 @@ test_description='git grep various.
 
 . ./test-lib.sh
 
+test_expect_success 'Check for external grep support' '
+	case "$(git grep -h 2>&1|grep ext-grep)" in
+	*"(default)"*)
+		test_set_prereq external-grep
+		true;;
+	*"(ignored by this build)"*)
+		true;;
+	*)
+		false;;
+	esac
+'
+
 cat >hello.c <<EOF
 #include <stdio.h>
 int main(int argc, const char **argv)
-- 
1.6.6.315.g1a406