lvm_scan: do not overwrite a preexisting /etc/lvm/lvm.conf

modules.d/90lvm/lvm_scan.sh

@@ -14,6 +14,8 @@ if $UDEV_QUEUE_EMPTY >/dev/null 2>&1; then
 	    echo -n "${f##/tmp/.lvm_scan-} "
 	done
 	)
+
+    if [ ! -e /etc/lvm/lvm.conf ]; then 
         {
 	    echo 'devices {';
 	    echo -n '    filter = [ '
@@ -24,9 +26,12 @@ if $UDEV_QUEUE_EMPTY >/dev/null 2>&1; then
 	    echo 'types = [ "blkext", 1024 ]'
 	    echo '}';	  
         } > /etc/lvm/lvm.conf
-
+	lvmwritten=1
+    fi
     info "Scanning devices $lvmdevs for LVM volume groups $VGS"
     lvm vgscan 2>&1 | vinfo
     lvm vgchange -ay $VGS 2>&1 | vinfo
+    [ "$lvmwritten" ] && rm -f /etc/lvm/lvm.conf
+    unset lvmwritten
 fi