92 lines
2.4 KiB
Nix
92 lines
2.4 KiB
Nix
{ stdenv, writeText, substituteAll, cleanSource, udev, procps, firmwareDirs
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, extraUdevPkgs ? []
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}:
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let
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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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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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buildCommand = "
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buildCommand= # urgh
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ensureDir $out
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for i in $src/*; do
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substituteAll $i $out/$(basename $i)
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done
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shopt -s nullglob
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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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";
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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$' || true
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# Start udev.
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${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/udevtrigger
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${udev}/sbin/udevsettle # 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 udevtrigger 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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}
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