* Activate software RAID devices from udev. This makes the swraid

Upstart jobs unnecessary.
* Support having the root filesystem on swraid.

svn path=/nixos/trunk/; revision=21807

modules/config/system-path.nix

@@ -34,7 +34,6 @@ let
       pkgs.less
       pkgs.libcap
       pkgs.man
-      pkgs.mdadm
       pkgs.module_init_tools
       pkgs.nano
       pkgs.ncurses

modules/system/boot/stage-1-init.sh

@@ -113,6 +113,7 @@ fi
 echo "running udev..."
 export UDEV_CONFIG_FILE=@udevConf@
 mkdir -p /dev/.udev # !!! bug in udev?
+mkdir -p /dev/.mdadm
 udevd --daemon
 udevadm control --env=STARTUP=1
 udevadm trigger --action=add

modules/system/boot/stage-1.nix

@@ -213,6 +213,7 @@ let
       cp ${pkgs.udev}/libexec/rules.d/60-persistent-storage.rules $out/
       cp ${pkgs.udev}/libexec/rules.d/80-drivers.rules $out/
       cp ${pkgs.lvm2}/lib/udev/rules.d/*.rules $out/
+      cp ${pkgs.mdadm}/lib/udev/rules.d/*.rules $out/
 
       for i in $out/*.rules; do
           substituteInPlace $i \
@@ -225,7 +226,8 @@ let
             --replace /sbin/blkid ${extraUtils}/bin/blkid \
             --replace /sbin/modprobe ${extraUtils}/bin/modprobe \
             --replace '$env{DM_SBIN_PATH}/blkid' ${extraUtils}/bin/blkid \
-            --replace 'ENV{DM_SBIN_PATH}="/sbin"' 'ENV{DM_SBIN_PATH}="${extraUtils}/bin"'
+            --replace 'ENV{DM_SBIN_PATH}="/sbin"' 'ENV{DM_SBIN_PATH}="${extraUtils}/bin"' \
+            --replace /sbin/mdadm ${extraUtils}/bin/mdadm
       done
 
       # Remove rule preventing creation of a by-label symlink

modules/tasks/swraid.nix

@@ -1,100 +1,11 @@
 { config, pkgs, ... }:
 
-###### implementation
-
-let
-
-  tempConf = "/var/run/mdadm.conf";
-  tempStatus = "/var/run/mdadm.status";
-  logFile = "/var/log/mdadmEvents.log";
-  modprobe = config.system.sbin.modprobe;
-  inherit (pkgs) mdadm diffutils;
-
-  mdadmEventHandler = pkgs.writeScript "mdadmEventHandler.sh" ''
-    #!/bin/sh
-
-    echo "$@" >> ${logFile}
-    case $1 in
-      (NewArray)
-        initctl emit -n new-raid-array
-        ;;
-      (*) ;;
-    esac
-  '';
-
-in
-  
 {
 
-  jobs.swraid = {
-    startOn = [ "new-raid-array" ];
-    description = "Assemble RAID arrays.";
-
-    script = ''
-      # Load the necessary RAID personalities.
-      # !!! hm, doesn't the kernel load these automatically?
-      for mod in raid0 raid1 raid5; do
-        ${modprobe}/sbin/modprobe $mod || true
-      done
-
-      # Wait until we can fetch the status of mdadm devices.
-      while ! test -e /proc/mdstat; do
-        sleep 10
-      done
-
-      # Scan /proc/partitions for RAID devices.
-      ${mdadm}/sbin/mdadm --examine --brief --scan -c partitions > ${tempConf}
-
-      # If there is some array to assemble and if the status has changed.
-      if test -e /proc/mdstat -a -s ${tempConf} &&
-         ! ${diffutils}/bin/diff -q /proc/mdstat ${tempStatus} > /dev/null; then
-
-        # Keep the previous status to watch changes.
-        cp ${tempStatus} ${tempStatus}.old
-
-        try=0
-        # Loop until the status change.
-        while ${diffutils}/bin/diff -q ${tempStatus} ${tempStatus}.old > /dev/null; do
-          test "$try" -gt 12 && break
-          test "$try" -ne 0 && sleep 10
-
-          # Activate each device found.
-          ${mdadm}/sbin/mdadm --assemble -c ${tempConf} --scan
-
-          # Register the new status
-          cp /proc/mdstat ${tempStatus}
-
-          try=$(($try + 1))
-        done
-
-        if test "$try" -le 6; then
-          # Send notifications.
-          initctl emit -n new-devices
-        fi
-
-        # Remove previous status.
-        rm ${tempStatus}.old
-      fi
-    '';
-
-    task = true;
-  };
-
-  jobs.swraidEvents = {
-    name = "swraid-events";
-    description = "Watch mdadm events.";
-    startOn = [ "startup" ];
-
-    postStart = ''
-      echo > ${tempConf}
-      echo > ${tempStatus}
-
-      # Assemble early raid devices.
-      initctl emit -n new-raid-array
-    '';
-
-    # !!! Someone should ensure that this is indeed doing what the manual says.
-    exec = "${mdadm}/sbin/mdadm --monitor --scan --program ${mdadmEventHandler}";
-  };
+  environment.systemPackages = [ pkgs.mdadm ];
+  
+  services.udev.packages = [ pkgs.mdadm ];
 
+  boot.initrd.availableKernelModules = [ "md_mod" "raid0" "raid1" "raid456" ];
+  
 }