forked from mirrors/nixpkgs
138 lines
4.1 KiB
Nix
138 lines
4.1 KiB
Nix
{ stdenv, writeText, substituteAll, cleanSource, udev, procps, firmwareDirs, modprobe
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, extraUdevPkgs ? []
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, config
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}:
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let
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cfg = config.services.udev;
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firmwareLoader = substituteAll {
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src = ./udev-firmware-loader.sh;
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path = "${stdenv.coreutils}/bin";
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isExecutable = true;
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inherit firmwareDirs;
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};
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nixRules = writeText "10-nix.rules" ''
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# Miscellaneous devices.
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KERNEL=="sonypi", MODE="0666"
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KERNEL=="kvm", MODE="0666"
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KERNEL=="kqemu", NAME="%k", MODE="0666"
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# Create a symlink for the CD-ROM device.
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#KERNEL=="hd[a-z]", BUS=="ide", SYSFS{removable}=="1", SYSFS{device/media}=="cdrom", SYMLINK+="cdrom cdrom-%k"
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#KERNEL=="sr[0-9]", BUS=="scsi", SYMLINK+="cdrom cdrom-%k"
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# ALSA sound devices.
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KERNEL=="controlC[0-9]*", NAME="snd/%k", MODE="${cfg.sndMode}"
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KERNEL=="hwC[D0-9]*", NAME="snd/%k", MODE="${cfg.sndMode}"
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KERNEL=="pcmC[D0-9cp]*", NAME="snd/%k", MODE="${cfg.sndMode}"
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KERNEL=="midiC[D0-9]*", NAME="snd/%k", MODE="${cfg.sndMode}"
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KERNEL=="timer", NAME="snd/%k", MODE="${cfg.sndMode}"
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KERNEL=="seq", NAME="snd/%k", MODE="${cfg.sndMode}"
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# Firmware loading.
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SUBSYSTEM=="firmware", ACTION=="add", RUN+="${firmwareLoader}"
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'';
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# Perform substitutions in all udev rules files.
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udevRules = stdenv.mkDerivation {
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name = "udev-rules";
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#src = cleanSource ./udev-rules;
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buildCommand = ''
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ensureDir $out
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ln -s ${nixRules} $out/${nixRules.name}
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shopt -s nullglob
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cp ${udev}/etc/udev/rules.d/*.rules $out/
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${if config.boot.hardwareScan then
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''
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substituteInPlace $out/80-drivers.rules \
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--replace /sbin/modprobe ${modprobe}/sbin/modprobe
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''
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else
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''
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rm $out/80-drivers.rules
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''
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}
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for i in ${toString extraUdevPkgs}; do
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for j in $i/etc/udev/rules.d/*; do
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ln -s $j $out/$(basename $j)
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done
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done
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''; # */
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};
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# The udev configuration file
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conf = writeText "udev.conf" ''
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udev_rules="${udevRules}"
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#udev_log="debug"
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'';
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# Dummy file indicating whether we've run udevtrigger/udevsettle.
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# Since that *recreates* all device nodes with default permissions,
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# it's not nice to do that when a user is logged in (it messes up
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# the permissions set by pam_devperm).
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# !!! Actually, this makes the udev configuration less declarative;
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# changes may not take effect until the user reboots. We should
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# find a better way to preserve the permissions of logged-in users.
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devicesCreated = "/var/run/devices-created";
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in
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{
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name = "udev";
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job = ''
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start on startup
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stop on shutdown
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env UDEV_CONFIG_FILE=${conf}
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start script
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echo "" > /proc/sys/kernel/hotplug
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# Get rid of possible old udev processes.
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${procps}/bin/pkill -u root "^udevd$" || true
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# Do the loading of additional stage 2 kernel modules.
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# Maybe this isn't the best place...
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for i in ${toString config.boot.kernelModules}; do
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echo "Loading kernel module $i..."
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${modprobe}/sbin/modprobe $i || true
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done
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# Start udev.
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${udev}/sbin/udevd --daemon
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# Let udev create device nodes for all modules that have already
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# been loaded into the kernel (or for which support is built into
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# the kernel).
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if ! test -e ${devicesCreated}; then
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${udev}/sbin/udevadm trigger
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${udev}/sbin/udevadm settle # wait for udev to finish
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touch ${devicesCreated}
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fi
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# Kill udev, let Upstart restart and monitor it. (This is nasty,
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# but we have to run `udevadm trigger' first. Maybe we can use
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# Upstart's `binary' keyword, but it isn't implemented yet.)
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if ! ${procps}/bin/pkill -u root "^udevd$"; then
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echo "couldn't stop udevd"
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fi
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while ${procps}/bin/pgrep -u root "^udevd$"; do
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sleep 1
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done
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initctl emit new-devices
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end script
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respawn ${udev}/sbin/udevd
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'';
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passthru = {inherit udevRules;};
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}
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