451 lines
15 KiB
Nix
451 lines
15 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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udev = config.systemd.package;
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cfg = config.services.udev;
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initrdUdevRules = pkgs.runCommand "initrd-udev-rules" {} ''
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mkdir -p $out/etc/udev/rules.d
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for f in 60-cdrom_id 60-persistent-storage 75-net-description 80-drivers 80-net-setup-link; do
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ln -s ${config.boot.initrd.systemd.package}/lib/udev/rules.d/$f.rules $out/etc/udev/rules.d
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done
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'';
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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/99-local.rules";
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};
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extraHwdbFile = pkgs.writeTextFile {
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name = "extra-hwdb-file";
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text = cfg.extraHwdb;
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destination = "/etc/udev/hwdb.d/99-local.hwdb";
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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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# Needed for gpm.
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SUBSYSTEM=="input", KERNEL=="mice", TAG+="systemd"
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'';
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nixosInitrdRules = ''
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# Mark dm devices as db_persist so that they are kept active after switching root
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SUBSYSTEM=="block", KERNEL=="dm-[0-9]*", ACTION=="add|change", OPTIONS+="db_persist"
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'';
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# Perform substitutions in all udev rules files.
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udevRulesFor = { name, udevPackages, udevPath, udev, systemd, binPackages, initrdBin ? null }: pkgs.runCommand name
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{ preferLocalBuild = true;
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allowSubstitutes = false;
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packages = unique (map toString udevPackages);
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}
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''
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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 $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 $i \
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--replace \"/sbin/modprobe \"${pkgs.kmod}/bin/modprobe \
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--replace \"/sbin/mdadm \"${pkgs.mdadm}/sbin/mdadm \
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--replace \"/sbin/blkid \"${pkgs.util-linux}/sbin/blkid \
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--replace \"/bin/mount \"${pkgs.util-linux}/bin/mount \
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--replace /usr/bin/readlink ${pkgs.coreutils}/bin/readlink \
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--replace /usr/bin/basename ${pkgs.coreutils}/bin/basename 2>/dev/null
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${optionalString (initrdBin != null) ''
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substituteInPlace $i --replace '/run/current-system/systemd' "${removeSuffix "/bin" initrdBin}"
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''}
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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 ${udev}/lib/udev/$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 the path refers to /run/current-system/systemd, replace with config.systemd.package
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if [[ $i == /run/current-system/systemd* ]]; then
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i="${systemd}/''${i#/run/current-system/systemd/}"
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fi
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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 is not executable or does not exist"
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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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filesToFixup="$(for i in "$out"/*; do
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# list all files referring to (/usr)/bin paths, but allow references to /bin/sh.
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grep -P -l '\B(?!\/bin\/sh\b)(\/usr)?\/bin(?:\/.*)?' "$i" || :
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done)"
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if [ -n "$filesToFixup" ]; then
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echo "Consider fixing the following udev rules:"
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echo "$filesToFixup" | while read localFile; do
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remoteFile="origin unknown"
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for i in ${toString binPackages}; do
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for j in "$i"/*/udev/rules.d/*; do
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[ -e "$out/$(basename "$j")" ] || continue
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[ "$(basename "$j")" = "$(basename "$localFile")" ] || continue
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remoteFile="originally from $j"
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break 2
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done
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done
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refs="$(
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grep -o '\B\(/usr\)\?/s\?bin/[^ "]\+' "$localFile" \
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| sed -e ':r;N;''${s/\n/ and /;br};s/\n/, /g;br'
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)"
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echo "$localFile ($remoteFile) contains references to $refs."
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done
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exit 1
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fi
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# If auto-configuration is disabled, then remove
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# udev's 80-drivers.rules file, which contains rules for
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# automatically calling modprobe.
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${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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hwdbBin = pkgs.runCommand "hwdb.bin"
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{ preferLocalBuild = true;
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allowSubstitutes = false;
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packages = unique (map toString ([udev] ++ cfg.packages));
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}
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''
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mkdir -p etc/udev/hwdb.d
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for i in $packages; do
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echo "Adding hwdb files for package $i"
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for j in $i/{etc,lib}/udev/hwdb.d/*; do
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ln -s $j etc/udev/hwdb.d/$(basename $j)
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done
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done
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echo "Generating hwdb database..."
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# hwdb --update doesn't return error code even on errors!
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res="$(${pkgs.buildPackages.systemd}/bin/systemd-hwdb --root=$(pwd) update 2>&1)"
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echo "$res"
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[ -z "$(echo "$res" | egrep '^Error')" ]
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mv etc/udev/hwdb.bin $out
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'';
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compressFirmware = firmware:
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let
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inherit (config.boot.kernelPackages) kernelAtLeast;
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in
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if ! (firmware.compressFirmware or true) then
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firmware
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else
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if kernelAtLeast "5.19" then pkgs.compressFirmwareZstd firmware
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else if kernelAtLeast "5.3" then pkgs.compressFirmwareXz firmware
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else firmware;
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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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enable = mkEnableOption "udev, a device manager for the Linux kernel" // {
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default = true;
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};
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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` rules.
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All files found in
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{file}`«pkg»/etc/udev/rules.d` and
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{file}`«pkg»/lib/udev/rules.d`
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will be included.
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'';
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apply = map getBin;
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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 {env}`PATH` environment variable when
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executing programs from Udev rules.
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coreutils, gnu{sed,grep}, util-linux and config.systemd.package are
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automatically 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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ENV{ID_VENDOR_ID}=="046d", ENV{ID_MODEL_ID}=="0825", ENV{PULSE_IGNORE}="1"
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'';
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type = types.lines;
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description = ''
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Additional {command}`udev` rules. They'll be written
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into file {file}`99-local.rules`. Thus they are
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read and applied after all other rules.
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'';
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};
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extraHwdb = mkOption {
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default = "";
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example = ''
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evdev:input:b0003v05AFp8277*
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KEYBOARD_KEY_70039=leftalt
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KEYBOARD_KEY_700e2=leftctrl
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'';
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type = types.lines;
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description = ''
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Additional {command}`hwdb` files. They'll be written
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into file {file}`99-local.hwdb`. Thus they are
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read after all other files.
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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.package;
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default = [];
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description = ''
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List of packages 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 multiple packages contain firmware
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files with the same name, the first package in the list takes
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precedence. Note that you must rebuild your system if you add
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files to any of these directories.
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'';
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apply = list: pkgs.buildEnv {
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name = "firmware";
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paths = map compressFirmware list;
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pathsToLink = [ "/lib/firmware" ];
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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 [predictable names to network interfaces](https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/).
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If enabled, interfaces
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are assigned names that contain topology information
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(e.g. `wlp3s0`) 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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`eth0` and `eth1` flipping
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unpredictably.
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'';
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};
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boot.initrd.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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*This will only be used when systemd is used in stage 1.*
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List of packages containing {command}`udev` rules that will be copied to stage 1.
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All files found in
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{file}`«pkg»/etc/udev/rules.d` and
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{file}`«pkg»/lib/udev/rules.d`
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will be included.
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'';
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};
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binPackages = mkOption {
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type = types.listOf types.path;
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default = [];
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description = ''
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*This will only be used when systemd is used in stage 1.*
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Packages to search for binaries that are referenced by the udev rules in stage 1.
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This list always contains /bin of the initrd.
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'';
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apply = map getBin;
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};
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rules = mkOption {
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default = "";
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example = ''
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SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1D:60:B9:6D:4F", KERNEL=="eth*", 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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{command}`udev` rules to include in the initrd
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*only*. They'll be written into file
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{file}`99-local.rules`. Thus they are read and applied
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after the essential initrd rules.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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services.udev.extraRules = nixosRules;
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services.udev.packages = [ extraUdevRules extraHwdbFile ];
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services.udev.path = [ pkgs.coreutils pkgs.gnused pkgs.gnugrep pkgs.util-linux udev ];
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boot.kernelParams = mkIf (!config.networking.usePredictableInterfaceNames) [ "net.ifnames=0" ];
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boot.initrd.extraUdevRulesCommands = mkIf (!config.boot.initrd.systemd.enable && config.boot.initrd.services.udev.rules != "")
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''
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cat <<'EOF' > $out/99-local.rules
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${config.boot.initrd.services.udev.rules}
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EOF
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'';
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boot.initrd.services.udev.rules = nixosInitrdRules;
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boot.initrd.systemd.additionalUpstreamUnits = [
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"initrd-udevadm-cleanup-db.service"
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"systemd-udevd-control.socket"
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"systemd-udevd-kernel.socket"
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"systemd-udevd.service"
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"systemd-udev-settle.service"
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"systemd-udev-trigger.service"
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];
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boot.initrd.systemd.storePaths = [
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"${config.boot.initrd.systemd.package}/lib/systemd/systemd-udevd"
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"${config.boot.initrd.systemd.package}/lib/udev/ata_id"
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"${config.boot.initrd.systemd.package}/lib/udev/cdrom_id"
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"${config.boot.initrd.systemd.package}/lib/udev/scsi_id"
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"${config.boot.initrd.systemd.package}/lib/udev/rules.d"
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] ++ map (x: "${x}/bin") config.boot.initrd.services.udev.binPackages;
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# Generate the udev rules for the initrd
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boot.initrd.systemd.contents = {
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"/etc/udev/rules.d".source = udevRulesFor {
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name = "initrd-udev-rules";
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initrdBin = config.boot.initrd.systemd.contents."/bin".source;
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udevPackages = config.boot.initrd.services.udev.packages;
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udevPath = config.boot.initrd.systemd.contents."/bin".source;
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udev = config.boot.initrd.systemd.package;
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systemd = config.boot.initrd.systemd.package;
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binPackages = config.boot.initrd.services.udev.binPackages ++ [ config.boot.initrd.systemd.contents."/bin".source ];
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};
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};
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# Insert initrd rules
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boot.initrd.services.udev.packages = [
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initrdUdevRules
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(mkIf (config.boot.initrd.services.udev.rules != "") (pkgs.writeTextFile {
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name = "initrd-udev-rules";
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destination = "/etc/udev/rules.d/99-local.rules";
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text = config.boot.initrd.services.udev.rules;
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}))
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];
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environment.etc = {
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"udev/rules.d".source = udevRulesFor {
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name = "udev-rules";
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udevPackages = cfg.packages;
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systemd = config.systemd.package;
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binPackages = cfg.packages;
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inherit udevPath udev;
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};
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"udev/hwdb.bin".source = hwdbBin;
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} // lib.optionalAttrs config.boot.modprobeConfig.enable {
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# We don't place this into `extraModprobeConfig` so that stage-1 ramdisk doesn't bloat.
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"modprobe.d/firmware.conf".text = "options firmware_class path=${config.hardware.firmware}/lib/firmware";
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};
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system.requiredKernelConfig = with config.lib.kernelConfig; [
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(isEnabled "UNIX")
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(isYes "INOTIFY_USER")
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(isYes "NET")
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];
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system.activationScripts.udevd = lib.mkIf config.boot.kernel.enable ''
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# The deprecated hotplug uevent helper is not used anymore
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if [ -e /proc/sys/kernel/hotplug ]; then
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echo "" > /proc/sys/kernel/hotplug
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fi
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# Allow the kernel to find our firmware.
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if [ -e /sys/module/firmware_class/parameters/path ]; then
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echo -n "${config.hardware.firmware}/lib/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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{ restartTriggers = cfg.packages;
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};
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};
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imports = [
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(mkRenamedOptionModule [ "services" "udev" "initrdRules" ] [ "boot" "initrd" "services" "udev" "rules" ])
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];
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}
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