epm: check if /dev/stdin is pipe when check command in stdin

bin/epm

@@ -625,7 +625,7 @@ fi
 export EPM_OPTIONS="$nodeps $force $verbose $debug $quiet $interactive $non_interactive $save_only $download_only"
 
 # if input is not console and run script from file, get pkgs from stdin too
-if [ ! -n "$inscript" ] && ! inputisatty && [ -n "$PROGDIR" ] ; then
+if [ ! -n "$inscript" ] && [ -p /dev/stdin ] && [ "$EPMMODE" != "pipe" ] ; then
     for opt in $(withtimeout 10 cat) ; do
         # FIXME: do not work
         # workaround against # yes | epme