* Modularize filesystem support. Filesystems such as btrfs and

reiserfs now have separate modules that are conditional on
  boot.supportedFilesystems and boot.initrd.supportedFilesystems.
  By default, these include the filesystems specified in the fsType
  attribute in fileSystems.  Ext2/3/4 support is currently
  unconditional.

  Also unbreak the installer test (http://hydra.nixos.org/build/2272302). 

svn path=/nixos/trunk/; revision=32954

modules/config/system-path.nix

@@ -17,7 +17,6 @@ let
 
   requiredPackages =
     [ config.system.sbin.modprobe # must take precedence over module_init_tools
-      config.system.sbin.mount # must take precedence over util-linux
       config.system.build.upstart
       config.environment.nix
       pkgs.acl

modules/module-list.nix

@@ -114,6 +114,7 @@
   ./services/networking/cntlm.nix
   ./services/networking/ddclient.nix
   ./services/networking/dhclient.nix
+  #./services/networking/dhcpcd.nix
   ./services/networking/dhcpd.nix
   ./services/networking/dnsmasq.nix
   ./services/networking/ejabberd.nix
@@ -198,6 +199,10 @@
   ./system/upstart/upstart.nix
   ./tasks/cpu-freq.nix
   ./tasks/filesystems.nix
+  ./tasks/filesystems/btrfs.nix
+  ./tasks/filesystems/ext.nix
+  ./tasks/filesystems/nfs.nix
+  ./tasks/filesystems/reiserfs.nix
   ./tasks/kbd.nix
   ./tasks/lvm.nix
   ./tasks/network-interfaces.nix

modules/profiles/base.nix

@@ -31,7 +31,6 @@
 
     # Tools to create / manipulate filesystems.
     pkgs.ntfsprogs # for resizing NTFS partitions
-    pkgs.btrfsProgs
     pkgs.dosfstools
     pkgs.xfsprogs
     pkgs.jfsutils
@@ -50,4 +49,8 @@
     pkgs.bvi # binary editor
     pkgs.joe
   ];
+
+  # Include support for various filesystems.
+  boot.supportedFilesystems = [ "btrfs" "reiserfs" ];
+
 }

modules/services/misc/autofs.nix

@@ -6,8 +6,6 @@ let
 
   cfg = config.services.autofs;
 
-  mount = config.system.sbin.mount;
-
   autoMaster = pkgs.writeText "auto.master" cfg.autoMaster;
 
 in
@@ -114,7 +112,7 @@ in
           unescapeSpaces(){ sed 's/\\040/ /g'; }
           sed -n 's@^\s*\(\([^\\ ]\|\\ \)*\)\s.*@\1@p' ${autoMaster} | sed 's/[\\]//' | while read mountPoint; do
             sed -n "s@[^ ]\+\s\+\($(echo "$mountPoint"| escapeSpaces)[^ ]*\).*@\1@p" /proc/mounts | sort -r | unescapeSpaces| while read smountP; do
-              ${mount}/bin/umount -l "$smountP" || true
+              ${pkgs.utillinux}/bin/umount -l "$smountP" || true
             done
           done
           '';

modules/services/network-filesystems/nfs-kernel.nix

@@ -151,7 +151,7 @@ in
                 ${config.system.sbin.modprobe}/sbin/modprobe nfsd || true
 
                 ${pkgs.sysvtools}/bin/mountpoint -q /proc/fs/nfsd \
-                || ${config.system.sbin.mount}/bin/mount -t nfsd none /proc/fs/nfsd
+                || ${pkgs.utillinux}/bin/mount -t nfsd none /proc/fs/nfsd
 
                 ${optionalString cfg.server.createMountPoints
                   ''

modules/system/boot/kernel.nix

@@ -148,9 +148,6 @@ let kernel = config.boot.kernelPackages.kernel; in
         "ide_disk"
         "ide_generic"
 
-        # Filesystems.
-        "ext2" "ext3" "ext4"
-
         # Support USB keyboards, in case the boot fails and we only have
         # a USB keyboard.
         "uhci_hcd"

modules/system/boot/stage-1.nix

@@ -153,17 +153,6 @@ let
       cp -v ${pkgs.coreutils}/bin/sleep $out/bin
       cp -v ${pkgs.coreutils}/bin/ln $out/bin
 
-      # Copy e2fsck and friends.
-      cp -v ${pkgs.e2fsprogs}/sbin/e2fsck $out/bin
-      cp -v ${pkgs.e2fsprogs}/sbin/tune2fs $out/bin
-      cp -v ${pkgs.reiserfsprogs}/sbin/reiserfsck $out/bin
-      ln -sv e2fsck $out/bin/fsck.ext2
-      ln -sv e2fsck $out/bin/fsck.ext3
-      ln -sv e2fsck $out/bin/fsck.ext4
-      ln -sv reiserfsck $out/bin/fsck.reiserfs
-
-      cp -pdv ${pkgs.e2fsprogs}/lib/lib*.so.* $out/lib
-
       # Copy dmsetup and lvm.
       cp -v ${pkgs.lvm2}/sbin/dmsetup $out/bin/dmsetup
       cp -v ${pkgs.lvm2}/sbin/lvm $out/bin/lvm
@@ -189,11 +178,6 @@ let
         cp ${kernelPackages.splashutils}/${kernelPackages.splashutils.helperName} $out/bin/splash_helper
       ''}
 
-      # Copy nfsmount if there is any NFS mounts required for boot.
-      ${optionalString (filter (fs: fs.fsType == "nfs" && (fs.mountPoint == "/" || fs.neededForBoot)) fileSystems != []) ''
-        cp -v ${pkgs.klibc}/lib/klibc/bin.static/nfsmount $out/bin
-      ''}
-
       ${config.boot.initrd.extraUtilsCommands}
 
       # Run patchelf to make the programs refer to the copied libraries.
@@ -223,13 +207,10 @@ let
       export LD_LIBRARY_PATH=$out/lib
       $out/bin/mount --version | grep "mount from"
       $out/bin/umount --version | grep "umount "
-      $out/bin/e2fsck -V 2>&1 | grep "e2fsck "
-      $out/bin/tune2fs 2> /dev/null | grep "tune2fs "
       $out/bin/udevadm --version
       $out/bin/blkid -v 2>&1 | tee -a $out/log | grep "blkid from util-linux"
       $out/bin/dmsetup --version 2>&1 | tee -a $out/log | grep "version:"
       LVM_SYSTEM_DIR=$out $out/bin/lvm version 2>&1 | tee -a $out/log | grep "LVM"
-      $out/bin/reiserfsck -V
       $out/bin/mdadm --version
       $out/bin/basename --version
       $out/bin/modprobe --version

modules/tasks/filesystems.nix

@@ -2,37 +2,6 @@
 
 with pkgs.lib;
 
-let
-  usingSome = fsname: any (fs: fs.fsType == fsname) config.fileSystems;
-  usingSomeStage1 =  fsname: any (fs: fs.fsType == fsname &&
-    (fs.mountPoint == "/" || fs.neededForBoot)) config.fileSystems;
-
-  usingBtrfs = usingSome "btrfs";
-  usingBtrfsStage1 = usingSomeStage1 "btrfs";
-
-  usingReiserfs = usingSome "reiserfs";
-  usingReiserfsStage1 = usingSomeStage1 "reiserfs";
-
-  # Packages that provide fsck backends.
-  fsPackages = [ pkgs.e2fsprogs pkgs.dosfstools ]
-    ++ optional usingReiserfs pkgs.btrfsProgs
-    ++ optional usingBtrfs pkgs.btrfsProgs;
-
-  fsKernelModules = optional usingBtrfsStage1 [ "btrfs" "crc32c" ]
-    ++ optional usingReiserfsStage1 [ "reiserfs" ];
-
-  fsExtraUtilsCommands = optionalString usingBtrfsStage1 ''
-      cp -v ${pkgs.btrfsProgs}/bin/btrfsck $out/bin
-      cp -v ${pkgs.btrfsProgs}/bin/btrfs $out/bin
-      ln -sv btrfsck $out/bin/fsck.btrfs
-    '';
-
-  fsPostDeviceCommands = optionalString usingBtrfsStage1 ''
-    btrfs device scan
-  '';
-
-in
-
 {
 
   ###### interface
@@ -54,7 +23,7 @@ in
         }
       ];
 
-      description = "
+      description = ''
         The file systems to be mounted.  It must include an entry for
         the root directory (<literal>mountPoint = \"/\"</literal>).  Each
         entry in the list is an attribute set with the following fields:
@@ -72,7 +41,7 @@ in
 
         <literal>autocreate</literal> forces <literal>mountPoint</literal> to be created with
         <command>mkdir -p</command> .
-      ";
+      '';
 
       type = types.nullOr (types.list types.optionSet);
 
@@ -81,36 +50,28 @@ in
         mountPoint = mkOption {
           example = "/mnt/usb";
           type = types.uniq types.string;
-          description = "
-            Location of the mounted the file system.
-          ";
+          description = "Location of the mounted the file system.";
         };
 
         device = mkOption {
           default = null;
           example = "/dev/sda";
           type = types.uniq (types.nullOr types.string);
-          description = "
-            Location of the device.
-          ";
+          description = "Location of the device.";
         };
 
         label = mkOption {
           default = null;
           example = "root-partition";
           type = types.uniq (types.nullOr types.string);
-          description = "
-            Label of the device (if any).
-          ";
+          description = "Label of the device (if any).";
         };
 
         fsType = mkOption {
           default = "auto";
           example = "ext3";
           type = types.uniq types.string;
-          description = "
-            Type of the file system.
-          ";
+          description = "Type of the file system.";
         };
 
         options = mkOption {
@@ -124,10 +85,10 @@ in
         autocreate = mkOption {
           default = false;
           type = types.bool;
-          description = "
+          description = ''
             Automatically create the mount point defined in
             <option>fileSystems.*.mountPoint</option>.
-          ";
+          '';
         };
 
         noCheck = mkOption {
@@ -138,12 +99,24 @@ in
       };
     };
 
-    system.sbin.mount = mkOption {
+    system.fsPackages = mkOption {
       internal = true;
-      default = pkgs.utillinux;
-      description = "
-        Package containing mount and umount.
-      ";
+      default = [ ];
+      description = "Packages supplying file system mounters and checkers.";
+    };
+
+    boot.supportedFilesystems = mkOption {
+      default = [ ];
+      example = [ "btrfs" ];
+      type = types.list types.string;
+      description = "Names of supported filesystem types.";
+    };
+
+    boot.initrd.supportedFilesystems = mkOption {
+      default = [ ];
+      example = [ "btrfs" ];
+      type = types.list types.string;
+      description = "Names of supported filesystem types in the initial ramdisk.";
     };
 
   };
@@ -153,10 +126,19 @@ in
 
   config = {
 
+    boot.supportedFilesystems =
+      map (fs: fs.fsType) config.fileSystems;
+
+    boot.initrd.supportedFilesystems =
+      map (fs: fs.fsType)
+        (filter (fs: fs.mountPoint == "/" || fs.neededForBoot) config.fileSystems);
+
     # Add the mount helpers to the system path so that `mount' can find them.
+    system.fsPackages = [ pkgs.dosfstools ];
+    
     environment.systemPackages =
-      [ pkgs.ntfs3g pkgs.cifs_utils pkgs.nfsUtils pkgs.mountall ]
-      ++ fsPackages;
+      [ pkgs.ntfs3g pkgs.cifs_utils pkgs.mountall ]
+      ++ config.system.fsPackages;
 
     environment.etc = singleton
       { source = pkgs.writeText "fstab"
@@ -183,10 +165,6 @@ in
         target = "fstab";
       };
 
-    boot.initrd.extraUtilsCommands = fsExtraUtilsCommands;
-    boot.initrd.postDeviceCommands = fsPostDeviceCommands;
-    boot.initrd.kernelModules = fsKernelModules;
-
     jobs.mountall =
       { startOn = "started udev"
           # !!! The `started nfs-kernel-statd' condition shouldn't be
@@ -198,12 +176,12 @@ in
 
         task = true;
 
+        path = [ pkgs.utillinux ] ++ config.system.fsPackages;
+
         script =
           ''
             exec > /dev/console 2>&1
             echo "mounting filesystems..."
-            export PATH=${config.system.sbin.mount}/bin:${makeSearchPath "sbin" ([pkgs.utillinux] ++ fsPackages)}:$PATH
-            ${optionalString usingBtrfs "${pkgs.btrfsProgs}/bin/btrfs device scan"}
             ${pkgs.mountall}/sbin/mountall
           '';
       };

modules/tasks/filesystems/btrfs.nix

@@ -0,0 +1,38 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  inInitrd = any (fs: fs == "btrfs") config.boot.initrd.supportedFilesystems;
+
+in
+
+{
+  config = mkIf (any (fs: fs == "btrfs") config.boot.supportedFilesystems) {
+
+    system.fsPackages = [ pkgs.btrfsProgs ];
+
+    boot.initrd.kernelModules = mkIf inInitrd [ "btrfs" "crc32c" ];
+
+    boot.initrd.extraUtilsCommands = mkIf inInitrd
+      ''
+        cp -v ${pkgs.btrfsProgs}/bin/btrfsck $out/bin
+        cp -v ${pkgs.btrfsProgs}/bin/btrfs $out/bin
+        ln -sv btrfsck $out/bin/fsck.btrfs
+      '';
+
+    boot.initrd.postDeviceCommands = mkIf inInitrd
+      ''
+        btrfs device scan
+      '';
+
+    # !!! This is broken.  There should be a udev rule to do this when
+    # new devices are discovered.
+    jobs.udev.postStart =
+      ''
+        ${pkgs.btrfsProgs}/bin/btrfs device scan
+      '';
+
+  };
+}

modules/tasks/filesystems/ext.nix

@@ -0,0 +1,22 @@
+{ config, pkgs, ... }:
+
+{
+  config = {
+
+    system.fsPackages = [ pkgs.e2fsprogs ];
+
+    boot.initrd.kernelModules = [ "ext2" "ext3" "ext4" ];
+
+    boot.initrd.extraUtilsCommands =
+      ''
+        # Copy e2fsck and friends.
+        cp -v ${pkgs.e2fsprogs}/sbin/e2fsck $out/bin
+        cp -v ${pkgs.e2fsprogs}/sbin/tune2fs $out/bin
+        ln -sv e2fsck $out/bin/fsck.ext2
+        ln -sv e2fsck $out/bin/fsck.ext3
+        ln -sv e2fsck $out/bin/fsck.ext4
+        cp -pdv ${pkgs.e2fsprogs}/lib/lib*.so.* $out/lib
+      '';
+
+  };
+}

modules/tasks/filesystems/nfs.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  inInitrd = any (fs: fs == "nfs") config.boot.initrd.supportedFilesystems;
+
+in
+
+{
+  config = {
+
+    system.fsPackages = [ pkgs.nfsUtils ];
+
+    boot.initrd.kernelModules = mkIf inInitrd [ "nfs" ];
+
+    boot.initrd.extraUtilsCommands = mkIf inInitrd
+      ''
+        # !!! Uh, why don't we just install mount.nfs?
+        cp -v ${pkgs.klibc}/lib/klibc/bin.static/nfsmount $out/bin
+      '';
+
+  };
+}

modules/tasks/filesystems/reiserfs.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  inInitrd = any (fs: fs == "reiserfs") config.boot.initrd.supportedFilesystems;
+
+in
+
+{
+  config = mkIf (any (fs: fs == "reiserfs") config.boot.supportedFilesystems) {
+
+    system.fsPackages = [ pkgs.reiserfsprogs ];
+
+    boot.initrd.kernelModules = mkIf inInitrd [ "reiserfs" ];
+
+    boot.initrd.extraUtilsCommands = mkIf inInitrd
+      ''
+        cp -v ${pkgs.reiserfsprogs}/sbin/reiserfsck $out/bin
+        ln -sv reiserfsck $out/bin/fsck.reiserfs
+      '';
+
+  };
+}