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Check if /proc/sys/kernel/hotplug exists before writing

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If a kernel without CONFIG_UEVENT_HELPER set is used with NixOS, the file
/proc/sys/kernel/hotplug does not exist. Before writing to it to disable
this deprecated mechanism, we have to ensure it actually exists because
otherwise the activation script will fail.
This commit is contained in:
Franz Pletz 2015-04-06 09:14:54 +02:00
parent 05a9e34f8a
commit 16d25f4fa6
1 changed files with 4 additions and 1 deletions
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5
nixos/modules/services/hardware/udev.nix
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@ -237,7 +237,10 @@ in
system.activationScripts.udevd =
''
echo "" > /proc/sys/kernel/hotplug
# The deprecated hotplug uevent helper is not used anymore
if [ -e /proc/sys/kernel/hotplug ]; then
echo "" > /proc/sys/kernel/hotplug
fi
# Regenerate the hardware database /var/lib/udev/hwdb.bin
# whenever systemd changes.