Docker checks: add check for docker stats

inc_dockerfunctions.sh

@@ -28,14 +28,14 @@ _is_docker_detected=0
 # param  string  json data
 # param  string  jq filter
 function _filterJson(){
-    echo "$1" | jq "$2"
+    echo "$1" | jq -r "$2"
 }
 
 # filter json data with jq (by expecting a single result) and remove quotes
 # param  string  json data
 # param  string  jq filter
 function _getString(){
-    _filterJson "$1" "$2" | tr -d '"' | sed "s#^null\$##"
+    _filterJson "$1" "$2" | sed "s#^null\$##g"
 }
 
 # if DOCKER_HOST is not set we try to detect the user running "containerd"
@@ -74,12 +74,10 @@ function _detectDockererror(){
         ph.exit
     fi
 
-    local sSrvErrror; 
-    sSrvErrror=$(  _filterJson "$data" ".ServerErrors" )
-    if [ "$sSrvErrror" != "null" ] ; then
+    if grep '"ServerErrors"' <<<"$data" >/dev/null; then
         ph.setStatus unknown
         ph.status "Unable to connect to Docker:"
-        echo "$sSrvErrror" | grep "^ "
+        _filterJson "$data" ".ServerErrors" | grep "^ "
         ph.exit
     fi