From e4716ce3ef5c2c8bcbeecdb37098cb24000369bd Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 28 May 2009 12:43:54 +0000
Subject: [PATCH] * Move global networking data (/etc/services, /etc/protocols,
   /etc/rpc, /etc/hosts) to modules/config/networking.nix.

svn path=/nixos/branches/modular-nixos/; revision=15764
---
 etc/default.nix               | 29 ++-------------------
 etc/hosts                     |  2 --
 modules/config/networking.nix | 49 +++++++++++++++++++++++++++++++++++
 modules/module-list.nix       |  1 +
 system/options.nix            |  8 ------
 5 files changed, 52 insertions(+), 37 deletions(-)
 delete mode 100644 etc/hosts
 create mode 100644 modules/config/networking.nix

diff --git a/etc/default.nix b/etc/default.nix
index ea37a91adb1..42037c8d440 100644
--- a/etc/default.nix
+++ b/etc/default.nix
@@ -47,35 +47,10 @@ let
 
   pamConsolePerms = ./security/console.perms;
 
-  # These should be moved into the corresponding configuration files.
-  configFiles = [
-    { # TCP/UDP port assignments.
-      source = pkgs.iana_etc + "/etc/services";
-      target = "services";
-    }
-
-    { # IP protocol numbers.
-      source = pkgs.iana_etc + "/etc/protocols";
-      target = "protocols";
-    }
-
-    { # RPC program numbers.
-      source = pkgs.glibc + "/etc/rpc";
-      target = "rpc";
-    }
-
-    { # Hostname-to-IP mappings.
-      source = pkgs.substituteAll {
-        src = ./hosts;
-        extraHosts = config.networking.extraHosts;
-      };
-      target = "hosts";
-    }
-
-  ]
+  configFiles = 
 
   # A bunch of PAM configuration files for various programs.
-  ++ (map
+  (map
     (program:
       let isLDAPEnabled = config.users.ldap.enable; in
       { source = pkgs.substituteAll {
diff --git a/etc/hosts b/etc/hosts
deleted file mode 100644
index 71dd03ed229..00000000000
--- a/etc/hosts
+++ /dev/null
@@ -1,2 +0,0 @@
-@extraHosts@
-127.0.0.1 localhost
diff --git a/modules/config/networking.nix b/modules/config/networking.nix
new file mode 100644
index 00000000000..ff4d0f3fee4
--- /dev/null
+++ b/modules/config/networking.nix
@@ -0,0 +1,49 @@
+# /etc files related to networking, such as /etc/services.
+
+{config, pkgs, ...}:
+
+let
+
+  options = {
+
+    networking.extraHosts = pkgs.lib.mkOption {
+      default = "";
+      example = "192.168.0.1 lanlocalhost";
+      description = ''
+        Additional entries to be appended to <filename>/etc/hosts</filename>.
+      '';
+    };
+    
+  };
+
+in
+
+{
+  require = [options];
+
+  environment.etc =
+    [ { # /etc/services: TCP/UDP port assignments.
+        source = pkgs.iana_etc + "/etc/services";
+        target = "services";
+      }
+
+      { # /etc/protocols: IP protocol numbers.
+        source = pkgs.iana_etc + "/etc/protocols";
+        target = "protocols";
+      }
+
+      { # /etc/rpc: RPC program numbers.
+        source = pkgs.glibc + "/etc/rpc";
+        target = "rpc";
+      }
+
+      { # /etc/hosts: Hostname-to-IP mappings.
+        source = pkgs.writeText "hosts"
+          ''
+            ${config.networking.extraHosts}
+            127.0.0.1 localhost
+          '';
+        target = "hosts";
+      }
+    ];
+}
diff --git a/modules/module-list.nix b/modules/module-list.nix
index a8ca8a006b5..2f72d14d2b7 100644
--- a/modules/module-list.nix
+++ b/modules/module-list.nix
@@ -1,6 +1,7 @@
 [ # This file has been generated by gen-module-list.sh
   ./config/fonts.nix
   ./config/i18n.nix
+  ./config/networking.nix
   ./config/nsswitch.nix
   ./config/system-path.nix
   ./config/timezone.nix
diff --git a/system/options.nix b/system/options.nix
index 8e3308174e7..eb51250d28e 100644
--- a/system/options.nix
+++ b/system/options.nix
@@ -42,14 +42,6 @@ in
       ";
     };
 
-    extraHosts = mkOption {
-      default = "";
-      example = "192.168.0.1 lanlocalhost";
-      description = ''
-        Additional entries to be appended to <filename>/etc/hosts</filename>.
-      '';
-    };
-
     defaultGateway = mkOption {
       default = "";
       example = "131.211.84.1";