background update

rc

@@ -13,13 +13,14 @@ export PATH
 function _self_update() {
     touch "$TOOLSPATH"/.lastupdate
     pushd "$TOOLSPATH" > /dev/null
-    timeout 5 hg pull -u > /dev/null 2>&1
+    timeout 5 hg pull -u > /dev/null 2>&1 &
     popd > /dev/null
 }
 
 [[ "$1" = "-u" ]] && _self_update
 
 # Update self weekly
+[[ -w "$TOOLSPATH" ]] || return
 [[ -t 0 ]] || return
 [[ -t 1 ]] || return
 [[ -t 2 ]] || return