adding autofs support to modular nixos.

autofs/automount is used to mount cdroms
floppies or network drivers on the fly..

svn path=/nixos/branches/modular-nixos/; revision=15420

system/options.nix

@@ -489,6 +489,7 @@ in
     (import ../upstart-jobs/synergy.nix)
 
     (import ../upstart-jobs/nfs-kernel.nix)
+    (import ../upstart-jobs/autofs.nix)
 
     # nix
     (import ../upstart-jobs/nix.nix) # nix options and daemon

upstart-jobs/autofs.nix

@@ -0,0 +1,107 @@
+{pkgs, config, ...}:
+
+###### interface
+let
+  inherit (pkgs.lib) mkOption mkIf;
+
+  options = {
+    services = {
+
+      autofs = {
+        enable = mkOption {
+          default = false;
+          description = "
+            automatically mount and unmount filesystems
+          ";
+        };
+
+        autoMaster = mkOption {
+          example = ''
+            autoMaster = let
+              map = pkgs.writeText "auto" '''
+               kernel    -ro,soft,intr       ftp.kernel.org:/pub/linux
+               boot      -fstype=ext2        :/dev/hda1
+               windoze   -fstype=smbfs       ://windoze/c
+               removable -fstype=ext2        :/dev/hdd
+               cd        -fstype=iso9660,ro  :/dev/hdc
+               floppy    -fstype=auto        :/dev/fd0
+               server    -rw,hard,intr       / -ro myserver.me.org:/ \
+                                             /usr myserver.me.org:/usr \
+                                             /home myserver.me.org:/home
+              ''';
+            in '''
+              /auto file:${map}
+            '''
+          '';
+          description = "
+            file contents of /etc/auto.master. See man auto.master
+            see 
+            man auto.master and man 5 autofs
+          ";
+        };
+
+        timeout = mkOption {
+          default = 600;
+          description = "Set the global minimum timeout, in seconds, until directories are unmounted";
+        };
+
+        debug = mkOption {
+          default = false;
+          description = "pass -d to automount and write log to /var/log/autofs";
+        };
+      };
+    };
+  };
+
+###### implementation
+
+  inherit (pkgs) lib writeTextopenssh autofs5;
+
+  cfg = (config.services.autofs);
+
+  modprobe = config.system.sbin.modprobe;
+
+in
+
+mkIf cfg.enable {
+
+  require = [
+    options
+  ];
+
+  environment = {
+    etc =
+      [ {
+        target = "auto.master";
+        source = pkgs.writeText "auto.master" cfg.autoMaster;
+      }];
+  };
+
+  services = {
+    extraJobs = [
+    {
+      name = "autofs";
+
+      # kernel module autofs  supports kernel protocol v3
+      # kernel module autofs4 supports kernel protocol v3, v4, v5
+      job = ''
+        description "automatically mount filesystems"
+
+        start on network-interfaces/started
+        stop on network-interfaces/stop
+
+        PATH=${pkgs.nfsUtils}/sbin:${modprobe}/sbin
+
+        start script
+          modprobe autofs4 || true
+        end script
+
+        script
+          ${if cfg.debug then "exec &> /var/log/autofs" else ""}
+          ${pkgs.autofs5}/sbin/automount -f -t ${builtins.toString cfg.timeout} ${if cfg.debug then "-d" else ""} "${pkgs.writeText "auto.master" cfg.autoMaster}"
+        end script
+      '';
+    }
+    ];
+  };
+}