common/rc: use /bin/bash in _user_do()

Without this the epressions in generic/256 will fail on a system
where /bin/sh is the Default (e.g. modern Debian versions).

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/common/rc b/common/rc
index 67cb8dd4c1..892c46e885 100644
--- a/common/rc
+++ b/common/rc
@@ -1809,7 +1809,7 @@ _user_do()
 	then
 	echo $1 | /bin/bash "su $qa_user 2>&1" | _filter_user_do
     else
-	echo $1 | su $qa_user 2>&1 | _filter_user_do
+	echo $1 | su -s /bin/bash $qa_user 2>&1 | _filter_user_do
     fi
 }