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