ceph_diskfree harden sudo command execution

check_ceph_diskfree

@@ -21,11 +21,12 @@
 # 2023-05-09  v1.3  <axel.hahn@unibe.ch>      add help
 # 2023-06-19  v1.4  <axel.hahn@unibe.ch>      no more tmpfile
 # 2023-07-27  v1.5  <axel.hahn@unibe.ch>      update help page
+# 2023-10-20  v1.6  <axel.hahn@unibe.ch>      harden sudo command execution
 # ======================================================================
 
 . $(dirname $0)/inc_pluginfunctions
 
-export self_APPVERSION=1.5
+export self_APPVERSION=1.6
 
 typeset -i iWarning=0
 typeset -i iCritical=0
@@ -68,7 +69,7 @@ typeset -i iWarnLimit=$(     ph.getValueWithParam 70 w "$@")
 typeset -i iCriticalLimit=$( ph.getValueWithParam 90 c "$@")
 
 
-if ! data=$( sudo /bin/ceph df 2>&1 )
+if ! data=$( sudo -n /bin/ceph df 2>&1 )
 then
     echo "$data"
     ph.abort "UNKNOWN: ceph is not available or no sudo permissions to execute ceph commands."