[PATCH] selftests/run_kselftest.sh: Use readlink if realpath is not available

[Yosry Ahmed]

'realpath' is not always available,  fallback to 'readlink -f' if is not
available. They seem to work equally well in this context.

Signed-off-by: Yosry Ahmed <yosry.ahmed@xxxxxxxxx>
---
 tools/testing/selftests/run_kselftest.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/run_kselftest.sh b/tools/testing/selftests/run_kselftest.sh
index 50e03eefe7ac7..0443beacf3621 100755
--- a/tools/testing/selftests/run_kselftest.sh
+++ b/tools/testing/selftests/run_kselftest.sh
@@ -3,7 +3,14 @@
 #
 # Run installed kselftest tests.
 #
-BASE_DIR=$(realpath $(dirname $0))
+
+# Fallback to readlink if realpath is not available
+if which realpath > /dev/null; then
+        BASE_DIR=$(realpath $(dirname $0))
+else
+        BASE_DIR=$(readlink -f $(dirname $0))
+fi
+
 cd $BASE_DIR
 TESTS="$BASE_DIR"/kselftest-list.txt
 if [ ! -r "$TESTS" ] ; then
-- 
2.49.0.rc1.451.g8f38331e32-goog