add in_outputs shell function which ensures umask is set

pkgs/liminix-tools/networking/pppoe.nix

@@ -19,7 +19,7 @@ let
   name = "${interface.device}.pppoe";
   ip-up = writeAshScript "ip-up" {} ''
     . ${serviceFns} 
-    (cd $(mkoutputs ${name}); umask 0027
+    (in_outputs ${name}
      echo $1 > ifname
      echo $2 > tty
      echo $3 > speed

pkgs/liminix-tools/networking/udhcpc.nix

@@ -16,7 +16,7 @@ let
 
     set_address() {
         ip address replace $ip/$mask dev $interface
-        (cd $(mkoutputs ${name}); umask 0027
+        (in_outputs ${name}
          for i in lease mask ip router siaddr dns serverid subnet opt53 interface ; do
             echo ''${!i} > $i
          done)

pkgs/service-fns/default.nix

@@ -7,4 +7,7 @@ writeText "service-fns.sh" ''
     mkdir -m 2750 -p $d && chown root:system $d
     echo $d
   }
+  in_outputs() {
+    cd `mkoutputs $1` && umask 0027
+  }
 ''