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* Use postStart instead of preStart.

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* Assemble devices only if there is a new entry.
* Add 'new-raid-array' flag to assemble new arrays.
* Emit new-devices flag to triggers the 'filesystems' task.

svn path=/nixos/trunk/; revision=19145
This commit is contained in:
Nicolas Pierron 2009-12-29 14:10:05 +00:00
parent e70214c853
commit 4cf78fdb77
1 changed files with 40 additions and 22 deletions
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62
modules/tasks/swraid.nix
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@ -15,7 +15,7 @@ let
echo "$@" >> ${logFile}
case $1 in
(NewArray)
initctl emit -n new-devices
initctl emit -n new-raid-array
;;
(*) ;;
esac
@ -25,33 +25,51 @@ in
{
jobs.swraid =
{ startOn = [ "startup" "new-devices" ];
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
# Scan /proc/partitions for RAID devices.
${mdadm}/sbin/mdadm --examine --brief --scan -c partitions > ${tempConf}
if ! test -s ${tempConf}; then exit 0; fi
# Activate each device found.
${mdadm}/sbin/mdadm --assemble -c ${tempConf} --scan
'';
jobs.swraid = {
startOn = [ "new-raid-array" ];
description = "Assemble RAID arrays.";
task = true;
};
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
# Save previous probe
mv ${tempConf} ${tempConf}.old
# Scan /proc/partitions for RAID devices.
${mdadm}/sbin/mdadm --examine --brief --scan -c partitions > ${tempConf}
if ! diff ${tempConf} ${tempConf}.old > /dev/null; then
# Activate each device found.
${mdadm}/sbin/mdadm --assemble -c ${tempConf} --scan
# Send notifications.
initctl emit -n new-devices
fi
# Remove previous configuration.
rm ${tempConf}.old
'';
task = true;
};
jobs.swraidEvents = {
name = "swraid-events";
description = "Watch mdadm events.";
startOn = [ "startup" ];
postStart = ''
echo > ${tempConf}
# Assemble early raid devices.
initctl emit -n new-raid-array
'';
# !!! Someone should ensure that this is indeed doing what the manual says.
exec = "${mdadm}/sbin/mdadm --monitor --scan --program ${mdadmEventHandler}";
};