dc093b57dd
interface names, use udev's own firmware loader, and dropped the sndMode option (udev puts all audio devices in the "audio" group, so users can be added to that group if necessary). svn path=/nixos/trunk/; revision=16692
222 lines
6.7 KiB
Nix
222 lines
6.7 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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inherit (pkgs) stdenv writeText udev procps;
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cfg = config.services.udev;
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extraUdevRules = pkgs.writeTextFile {
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name = "extra-udev-rules";
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text = cfg.extraRules;
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destination = "/etc/udev/rules.d/10-local.rules";
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};
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modprobe = config.system.sbin.modprobe;
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nixosRules = ''
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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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KERNEL=="vboxdrv", NAME="vboxdrv", OWNER="root", GROUP="root", MODE="0666"
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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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buildCommand = ''
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ensureDir $out
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shopt -s nullglob
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# Use all the default udev rules.
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cp ${udev}/libexec/rules.d/*.rules $out/
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# Set a reasonable $PATH for programs called by udev rules.
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echo 'ENV{PATH}="${pkgs.coreutils}/bin:${pkgs.gnused}/bin:${pkgs.utillinux}/bin"' > $out/00-path.rules
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# Set the firmware search path so that the firmware.sh helper
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# called by 50-firmware.rules works properly.
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echo 'ENV{FIRMWARE_DIRS}="${toString config.hardware.firmware}"' >> $out/00-path.rules
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# Fix some paths in the standard udev rules.
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for i in $out/*.rules; do
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substituteInPlace $i \
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--replace /sbin/modprobe ${modprobe}/sbin/modprobe \
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--replace /sbin/blkid ${pkgs.utillinux}/sbin/blkid \
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--replace /sbin/mdadm ${pkgs.mdadm}/sbin/madm
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done
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# If auto-configuration is disabled, then remove
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# udev's 80-drivers.rules file, which contains rules for
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# automatically calling modprobe.
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${if !config.boot.hardwareScan then "rm $out/80-drivers.rules" else ""}
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# Add the udev rules from other packages.
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for i in ${toString cfg.packages}; do
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for j in $i/*/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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# Use the persistent device rules (naming for CD/DVD and
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# network devices) stored in
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# /var/lib/udev/rules.d/70-persistent-{cd,net}.rules. These are
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# modified by the write_{cd,net}_rules helpers called from
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# 75-cd-aliases-generator.rules and
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# 75-persistent-net-generator.rules.
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ln -s /var/lib/udev/rules.d/70-persistent-cd.rules $out/
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ln -s /var/lib/udev/rules.d/70-persistent-net.rules $out/
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''; # */
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};
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# The udev configuration file.
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conf = writeText "udev.conf" ''
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udev_rules="${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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###### interface
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options = {
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boot.hardwareScan = mkOption {
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default = true;
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description = ''
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Whether to try to load kernel modules for all detected hardware.
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Usually this does a good job of providing you with the modules
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you need, but sometimes it can crash the system or cause other
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nasty effects. If the hardware scan is turned on, it can be
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disabled at boot time by adding the <literal>safemode</literal>
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parameter to the kernel command line.
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'';
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};
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services.udev = {
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packages = mkOption {
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default = [];
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merge = mergeListOption;
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description = ''
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List of packages containing <command>udev</command> rules.
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All files found in
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<filename><replaceable>pkg</replaceable>/etc/udev/rules.d</filename> and
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<filename><replaceable>pkg</replaceable>/lib/udev/rules.d</filename>
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will be included.
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'';
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};
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extraRules = mkOption {
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default = "";
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example = ''
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KERNEL=="eth*", ATTR{address}=="00:1D:60:B9:6D:4F", NAME="my_fast_network_card"
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'';
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merge = mergeStringOption;
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description = ''
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Additional <command>udev</command> rules. They'll be written
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into file <filename>10-local.rules</filename>. Thus they are
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read before all other rules.
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'';
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};
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};
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hardware.firmware = mkOption {
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default = [];
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example = ["/root/my-firmware"];
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merge = mergeListOption;
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description = ''
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List of directories containing firmware files. Such files
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will be loaded automatically if the kernel asks for them
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(i.e., when it has detected specific hardware that requires
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firmware to function).
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'';
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};
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};
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###### implementation
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config = {
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services.udev.extraRules = nixosRules;
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services.udev.packages = [extraUdevRules];
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jobs = singleton
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{ name = "udev";
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startOn = "startup";
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stopOn = "shutdown";
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environment = { UDEV_CONFIG_FILE = conf; };
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preStart =
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''
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echo "" > /proc/sys/kernel/hotplug
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mkdir -p /var/lib/udev/rules.d
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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 $i || true
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done
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# Start udev.
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mkdir -p /dev/.udev # !!! bug in udev?
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${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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'';
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exec = "${udev}/sbin/udevd";
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};
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};
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}
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