introduce subshells to limit side-effects

1 files changed, 2 insertions, 2 deletions

diff --git a/hook b/hook
index 9af602dadb3f..cf5ef0d6df03 100755
--- a/hook
+++ b/hook
@@ -4,7 +4,7 @@
 # nannycam init hook
 #
 
-run_hook () {
+run_hook () { (
 
   set -e
   set -u
@@ -29,4 +29,4 @@ run_hook () {
     -m "$EXPECTED_MBR_HASH" \
     -p "$EXPECTED_MBR_GAP_HASH" \
     -e "$EXPECTED_EFI_STUB_HASH"
-}
+) }