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https://github.com/NixOS/nixpkgs.git
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16d25f4fa6
If a kernel without CONFIG_UEVENT_HELPER set is used with NixOS, the file /proc/sys/kernel/hotplug does not exist. Before writing to it to disable this deprecated mechanism, we have to ensure it actually exists because otherwise the activation script will fail.
264 lines
8.5 KiB
Nix
264 lines
8.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) stdenv writeText procps;
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udev = config.systemd.package;
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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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nixosRules = ''
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# Miscellaneous devices.
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KERNEL=="kvm", MODE="0666"
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KERNEL=="kqemu", MODE="0666"
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# Needed for gpm.
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SUBSYSTEM=="input", KERNEL=="mice", TAG+="systemd"
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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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preferLocalBuild = true;
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buildCommand = ''
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mkdir -p $out
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shopt -s nullglob
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set +o pipefail
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# Set a reasonable $PATH for programs called by udev rules.
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echo 'ENV{PATH}="${udevPath}/bin:${udevPath}/sbin"' > $out/00-path.rules
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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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echo "Adding rules for package $i"
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for j in $i/{etc,lib}/udev/rules.d/*; do
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echo "Copying $j to $out/$(basename $j)"
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cat $j > $out/$(basename $j)
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done
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done
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# Fix some paths in the standard udev rules. Hacky.
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for i in $out/*.rules; do
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substituteInPlace $i \
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--replace \"/sbin/modprobe \"${config.system.sbin.modprobe}/sbin/modprobe \
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--replace \"/sbin/mdadm \"${pkgs.mdadm}/sbin/mdadm \
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--replace \"/sbin/blkid \"${pkgs.utillinux}/sbin/blkid \
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--replace \"/bin/mount \"${pkgs.utillinux}/bin/mount
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done
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echo -n "Checking that all programs called by relative paths in udev rules exist in ${udev}/lib/udev... "
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import_progs=$(grep 'IMPORT{program}="[^/$]' $out/* |
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sed -e 's/.*IMPORT{program}="\([^ "]*\)[ "].*/\1/' | uniq)
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run_progs=$(grep -v '^[[:space:]]*#' $out/* | grep 'RUN+="[^/$]' |
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sed -e 's/.*RUN+="\([^ "]*\)[ "].*/\1/' | uniq)
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for i in $import_progs $run_progs; do
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if [[ ! -x ${pkgs.udev}/lib/udev/$i && ! $i =~ socket:.* ]]; then
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echo "FAIL"
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echo "$i is called in udev rules but not installed by udev"
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exit 1
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fi
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done
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echo "OK"
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echo -n "Checking that all programs called by absolute paths in udev rules exist... "
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import_progs=$(grep 'IMPORT{program}="\/' $out/* |
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sed -e 's/.*IMPORT{program}="\([^ "]*\)[ "].*/\1/' | uniq)
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run_progs=$(grep -v '^[[:space:]]*#' $out/* | grep 'RUN+="/' |
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sed -e 's/.*RUN+="\([^ "]*\)[ "].*/\1/' | uniq)
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for i in $import_progs $run_progs; do
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if [[ ! -x $i ]]; then
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echo "FAIL"
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echo "$i is called in udev rules but not installed by udev"
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exit 1
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fi
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done
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echo "OK"
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echo "Consider fixing the following udev rules:"
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for i in ${toString cfg.packages}; do
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grep -l '\(RUN+\|IMPORT{program}\)="\(/usr\)\?/s\?bin' $i/*/udev/rules.d/* || true
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done
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${optionalString config.networking.usePredictableInterfaceNames ''
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cp ${./80-net-setup-link.rules} $out/80-net-setup-link.rules
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''}
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# If auto-configuration is disabled, then remove
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# udev's 80-drivers.rules file, which contains rules for
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# automatically calling modprobe.
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${optionalString (!config.boot.hardwareScan) ''
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ln -s /dev/null $out/80-drivers.rules
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''}
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''; # */
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};
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# Udev has a 512-character limit for ENV{PATH}, so create a symlink
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# tree to work around this.
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udevPath = pkgs.buildEnv {
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name = "udev-path";
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paths = cfg.path;
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pathsToLink = [ "/bin" "/sbin" ];
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ignoreCollisions = true;
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};
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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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type = types.bool;
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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.
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'';
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};
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services.udev = {
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packages = mkOption {
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type = types.listOf types.path;
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default = [];
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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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path = mkOption {
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type = types.listOf types.path;
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default = [];
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description = ''
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Packages added to the <envar>PATH</envar> environment variable when
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executing programs from Udev rules.
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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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type = types.lines;
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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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type = types.listOf types.path;
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default = [];
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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). If more than one path contains a
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firmware file with the same name, the first path in the list
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takes precedence. Note that you must rebuild your system if
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you add files to any of these directories. For quick testing,
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put firmware files in <filename>/root/test-firmware</filename>
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and add that directory to the list. Note that you can also
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add firmware packages to this list as these are directories in
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the nix store.
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'';
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apply = list: pkgs.buildEnv {
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name = "firmware";
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paths = list;
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pathsToLink = [ "/" ];
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ignoreCollisions = true;
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};
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};
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networking.usePredictableInterfaceNames = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether to assign <link
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xlink:href='http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames'>predictable
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names to network interfaces</link>. If enabled, interfaces
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are assigned names that contain topology information
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(e.g. <literal>wlp3s0</literal>) and thus should be stable
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across reboots. If disabled, names depend on the order in
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which interfaces are discovered by the kernel, which may
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change randomly across reboots; for instance, you may find
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<literal>eth0</literal> and <literal>eth1</literal> flipping
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unpredictably.
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'';
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};
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};
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###### implementation
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config = mkIf (!config.boot.isContainer) {
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services.udev.extraRules = nixosRules;
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services.udev.packages = [ extraUdevRules ];
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services.udev.path = [ pkgs.coreutils pkgs.gnused pkgs.gnugrep pkgs.utillinux udev ];
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environment.etc =
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[ { source = udevRules;
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target = "udev/rules.d";
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}
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];
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system.requiredKernelConfig = with config.lib.kernelConfig; [
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(isEnabled "UNIX")
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(isYes "INOTIFY_USER")
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(isYes "NET")
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];
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boot.extraModprobeConfig = "options firmware_class path=${config.hardware.firmware}";
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system.activationScripts.udevd =
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''
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# The deprecated hotplug uevent helper is not used anymore
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if [ -e /proc/sys/kernel/hotplug ]; then
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echo "" > /proc/sys/kernel/hotplug
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fi
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# Regenerate the hardware database /var/lib/udev/hwdb.bin
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# whenever systemd changes.
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if [ ! -e /var/lib/udev/prev-systemd -o "$(readlink /var/lib/udev/prev-systemd)" != ${config.systemd.package} ]; then
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echo "regenerating udev hardware database..."
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${config.systemd.package}/bin/udevadm hwdb --update && ln -sfn ${config.systemd.package} /var/lib/udev/prev-systemd
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fi
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# Allow the kernel to find our firmware.
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if [ -e /sys/module/firmware_class/parameters/path ]; then
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echo -n "${config.hardware.firmware}" > /sys/module/firmware_class/parameters/path
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fi
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'';
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systemd.services.systemd-udevd =
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{ environment.MODULE_DIR = "/run/booted-system/kernel-modules/lib/modules";
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};
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};
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}
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