handle save_y2logs when content modified when creating tarball

scripts/save_y2logs

@@ -142,11 +142,14 @@ echo "Saving YaST logs to $TARGET" >&2
 
 [ -n "$COMPRESSION" ] && COMPRESSION="--$COMPRESSION"
 
-tar cf "$TARGET" $COMPRESSION --dereference -C / $LIST -C /var/log $LIST_VAR -C $TMPDIR $LIST_TMP
+tar cf "$TARGET" --warning=no-file-changed $COMPRESSION --dereference -C / $LIST -C /var/log $LIST_VAR -C $TMPDIR $LIST_TMP
 err=$?
 
 rm -rf $TMPDIR
 
+# tar returns 1 when content of tarball is older then current system. Happen when something still writting to logs or memsampler (bsc#1182710#c2)
+[ $err == 1 ] && echo "Warning: logs modified during save. Yast is probably running. Content of tarball can be older then current content." >&2 && err=0
+
 [ $err != 0 ] && echo "FATAL: Error creating archive $TARGET" >&2
 
 exit $err