nixpkgs/upstart-jobs/udev.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption mkIf;
options = {
services = {
udev = {
addFirmware = mkOption {
default = [];
example = ["/mnt/big-storage/firmware/"];
description = "
To specify firmware that is not too spread to ensure
a package, or have an interactive process of extraction
and cannot be redistributed.
";
merge = pkgs.lib.mergeListOption;
};
addUdevPkgs = mkOption {
default = [];
description = "
List of packages containing udev rules. All files found in $out/*/udev/rules.d/*.rules will be recognized
";
merge = pkgs.lib.mergeListOption;
};
extraRules = mkOption {
default = "";
example = ''
KERNEL=="eth*", ATTR{address}=="00:1D:60:B9:6D:4F", NAME="my_fast_network_card"
'';
description = "
Add custom rules. They'll be written into file 10-local.rules.
Thus they are read before all other rules.
";
};
sndMode = mkOption {
default = "0600";
example = "0666";
description = "
Permissions for /dev/snd/*, in case you have multiple
logged in users or if the devices belong to root for
some reason.
";
};
};
};
};
in
###### implementation
let
inherit (pkgs) substituteAll stdenv writeText udev procps;
cfg = config.services.udev;
firmwareLoader = substituteAll {
src = ./udev-firmware-loader.sh;
path = "${stdenv.coreutils}/bin";
isExecutable = true;
inherit firmwareDirs;
};
firmwareDirs = config.services.udev.addFirmware;
extraUdevPkgs = config.services.udev.addUdevPkgs
++ pkgs.lib.optional (cfg.extraRules != "")
(pkgs.writeTextFile {
name = "extra-udev-rules";
text = cfg.extraRules;
destination = "/custom/udev/rules.d/10-local.rules";
});
modprobe = config.system.sbin.modprobe;
nixRules = writeText "90-nix.rules" ''
# Miscellaneous devices.
KERNEL=="sonypi", MODE="0666"
KERNEL=="kvm", MODE="0666"
KERNEL=="kqemu", NAME="%k", MODE="0666"
KERNEL=="vboxdrv", NAME="vboxdrv", OWNER="root", GROUP="root", MODE="0666"
# Create symlinks for CD/DVD devices.
ACTION=="add", SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", SYMLINK+="cdrom cdrom-%k"
ACTION=="add", SUBSYSTEM=="block", ENV{ID_CDROM_CD_RW}=="?*", SYMLINK+="cdrw cdrw-%k"
ACTION=="add", SUBSYSTEM=="block", ENV{ID_CDROM_DVD}=="?*", SYMLINK+="dvd dvd-%k"
ACTION=="add", SUBSYSTEM=="block", ENV{ID_CDROM_DVD_RW}=="?*", SYMLINK+="dvdrw dvdrw-%k"
# ALSA sound devices.
KERNEL=="controlC[0-9]*", NAME="snd/%k", MODE="${cfg.sndMode}"
KERNEL=="hwC[D0-9]*", NAME="snd/%k", MODE="${cfg.sndMode}"
KERNEL=="pcmC[D0-9cp]*", NAME="snd/%k", MODE="${cfg.sndMode}"
KERNEL=="midiC[D0-9]*", NAME="snd/%k", MODE="${cfg.sndMode}"
KERNEL=="timer", NAME="snd/%k", MODE="${cfg.sndMode}"
KERNEL=="seq", NAME="snd/%k", MODE="${cfg.sndMode}"
# Firmware loading.
SUBSYSTEM=="firmware", ACTION=="add", RUN+="${firmwareLoader}"
'';
# Perform substitutions in all udev rules files.
udevRules = stdenv.mkDerivation {
name = "udev-rules";
#src = cleanSource ./udev-rules;
buildCommand = ''
ensureDir $out
ln -s ${nixRules} $out/${nixRules.name}
shopt -s nullglob
cp ${udev}/*/udev/rules.d/*.rules $out/
${if config.boot.hardwareScan then
''
substituteInPlace $out/80-drivers.rules \
--replace /sbin/modprobe ${modprobe}/sbin/modprobe
''
else
''
rm $out/80-drivers.rules
''
}
for i in ${toString extraUdevPkgs}; do
for j in $i/*/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
{
require = [
options
];
services = {
extraJobs = [{
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
# Do the loading of additional stage 2 kernel modules.
# Maybe this isn't the best place...
for i in ${toString config.boot.kernelModules}; do
echo "Loading kernel module $i..."
${modprobe}/sbin/modprobe $i || true
done
# 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/udevadm trigger
${udev}/sbin/udevadm settle # wait for udev to finish
touch ${devicesCreated}
fi
# Kill udev, let Upstart restart and monitor it. (This is nasty,
# but we have to run `udevadm trigger' 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
'';
passthru = {inherit udevRules;};
}];
};
}