nixpkgs/upstart-jobs/udev.nix

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{ stdenv, writeText, substituteAll, cleanSource, udev, procps, firmwareDirs
, extraUdevPkgs ? []
, sndMode ? "0600"
}:
let
# Perform substitutions in all udev rules files.
udevRules = stdenv.mkDerivation {
name = "udev-rules";
src = cleanSource ./udev-rules;
firmwareLoader = substituteAll {
src = ./udev-firmware-loader.sh;
path = "${stdenv.coreutils}/bin";
isExecutable = true;
inherit firmwareDirs;
};
inherit sndMode;
buildCommand = "
buildCommand= # urgh
ensureDir $out
for i in $src/*; do
substituteAll $i $out/$(basename $i)
done
shopt -s nullglob
for i in ${toString extraUdevPkgs}; do
for j in $i/etc/udev/rules.d/*; do
ln -s $j $out/$(basename $j)
done
done
";
};
# The udev configuration file
conf = writeText "udev.conf" ''
udev_rules="${udevRules}"
#udev_log="debug"
'';
# Dummy file indicating whether we've run udevtrigger/udevsettle.
# Since that *recreates* all device nodes with default permissions,
# it's not nice to do that when a user is logged in (it messes up
# the permissions set by pam_devperm).
# !!! Actually, this makes the udev configuration less declarative;
# changes may not take effect until the user reboots. We should
# find a better way to preserve the permissions of logged-in users.
devicesCreated = "/var/run/devices-created";
in
{
name = "udev";
job = ''
start on startup
stop on shutdown
env UDEV_CONFIG_FILE=${conf}
start script
echo "" > /proc/sys/kernel/hotplug
# Get rid of possible old udev processes.
${procps}/bin/pkill -u root "^udevd$" || true
# Start udev.
${udev}/sbin/udevd --daemon
# Let udev create device nodes for all modules that have already
# been loaded into the kernel (or for which support is built into
# the kernel).
if ! test -e ${devicesCreated}; then
${udev}/sbin/udevtrigger
${udev}/sbin/udevsettle # wait for udev to finish
touch ${devicesCreated}
fi
# Kill udev, let Upstart restart and monitor it. (This is nasty,
# but we have to run udevtrigger first. Maybe we can use
# Upstart's `binary' keyword, but it isn't implemented yet.)
if ! ${procps}/bin/pkill -u root "^udevd$"; then
echo "couldn't stop udevd"
fi
while ${procps}/bin/pgrep -u root "^udevd$"; do
sleep 1
done
initctl emit new-devices
end script
respawn ${udev}/sbin/udevd
'';
}