mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-22 13:43:22 +00:00
274 lines
8.4 KiB
Nix
274 lines
8.4 KiB
Nix
{ config, pkgs, ... }:
|
||
|
||
with pkgs.lib;
|
||
|
||
let
|
||
|
||
inherit (pkgs) stdenv writeText udev procps;
|
||
|
||
cfg = config.services.udev;
|
||
|
||
extraUdevRules = pkgs.writeTextFile {
|
||
name = "extra-udev-rules";
|
||
text = cfg.extraRules;
|
||
destination = "/etc/udev/rules.d/10-local.rules";
|
||
};
|
||
|
||
nixosRules = ''
|
||
# Miscellaneous devices.
|
||
KERNEL=="kvm", MODE="0666"
|
||
KERNEL=="kqemu", MODE="0666"
|
||
'';
|
||
|
||
# Perform substitutions in all udev rules files.
|
||
udevRules = stdenv.mkDerivation {
|
||
name = "udev-rules";
|
||
buildCommand = ''
|
||
ensureDir $out
|
||
shopt -s nullglob
|
||
|
||
# Set a reasonable $PATH for programs called by udev rules.
|
||
echo 'ENV{PATH}="${udevPath}/bin:${udevPath}/sbin"' > $out/00-path.rules
|
||
|
||
# Set the firmware search path so that the firmware.sh helper
|
||
# called by 50-firmware.rules works properly.
|
||
echo 'ENV{FIRMWARE_DIRS}="/root/test-firmware ${toString config.hardware.firmware}"' >> $out/00-path.rules
|
||
|
||
# Add the udev rules from other packages.
|
||
for i in ${toString cfg.packages}; do
|
||
echo "Adding rules for package $i"
|
||
for j in $i/*/udev/rules.d/*; do
|
||
echo "Copying $j to $out/$(basename $j)"
|
||
echo "# Copied from $j" > $out/$(basename $j)
|
||
cat $j >> $out/$(basename $j)
|
||
done
|
||
done
|
||
|
||
# Fix some paths in the standard udev rules. Hacky.
|
||
for i in $out/*.rules; do
|
||
substituteInPlace $i \
|
||
--replace \"/sbin/modprobe \"${config.system.sbin.modprobe}/sbin/modprobe \
|
||
--replace \"/sbin/mdadm \"${pkgs.mdadm}/sbin/mdadm \
|
||
--replace \"/sbin/blkid \"${pkgs.utillinux}/sbin/blkid \
|
||
--replace \"/bin/mount \"${pkgs.utillinux}/bin/mount
|
||
done
|
||
|
||
# If auto-configuration is disabled, then remove
|
||
# udev's 80-drivers.rules file, which contains rules for
|
||
# automatically calling modprobe.
|
||
${if !config.boot.hardwareScan then "rm $out/80-drivers.rules" else ""}
|
||
|
||
echo -n "Checking that all programs called by relative paths in udev rules exist in ${udev}/lib/udev ... "
|
||
import_progs=$(grep 'IMPORT{program}="[^/$]' $out/* |
|
||
sed -e 's/.*IMPORT{program}="\([^ "]*\)[ "].*/\1/' | uniq)
|
||
run_progs=$(grep -v '^[[:space:]]*#' $out/* | grep 'RUN+="[^/$]' |
|
||
sed -e 's/.*RUN+="\([^ "]*\)[ "].*/\1/' | uniq)
|
||
for i in $import_progs $run_progs; do
|
||
if [[ ! -x ${pkgs.udev}/lib/udev/$i && ! $i =~ socket:.* ]]; then
|
||
echo "FAIL"
|
||
echo "$i is called in udev rules but not installed by udev"
|
||
exit 1
|
||
fi
|
||
done
|
||
echo "OK"
|
||
|
||
echo -n "Checking that all programs call by absolute paths in udev rules exist ... "
|
||
import_progs=$(grep 'IMPORT{program}="\/' $out/* |
|
||
sed -e 's/.*IMPORT{program}="\([^ "]*\)[ "].*/\1/' | uniq)
|
||
run_progs=$(grep -v '^[[:space:]]*#' $out/* | grep 'RUN+="/' |
|
||
sed -e 's/.*RUN+="\([^ "]*\)[ "].*/\1/' | uniq)
|
||
for i in $import_progs $run_progs; do
|
||
if [[ ! -x $i ]]; then
|
||
echo "FAIL"
|
||
echo "$i is called in udev rules but not installed by udev"
|
||
exit 1
|
||
fi
|
||
done
|
||
echo "OK"
|
||
|
||
echo "Consider fixing the following udev rules:"
|
||
for i in ${toString cfg.packages}; do
|
||
grep -l '\(RUN+\|IMPORT{program}\)="\(/usr\)\?/s\?bin' $i/*/udev/rules.d/* || true
|
||
done
|
||
|
||
# Use the persistent device rules (naming for CD/DVD and
|
||
# network devices) stored in
|
||
# /var/lib/udev/rules.d/70-persistent-{cd,net}.rules. These are
|
||
# modified by the write_{cd,net}_rules helpers called from
|
||
# 75-cd-aliases-generator.rules and
|
||
# 75-persistent-net-generator.rules.
|
||
ln -sv /var/lib/udev/rules.d/70-persistent-cd.rules $out/
|
||
ln -sv /var/lib/udev/rules.d/70-persistent-net.rules $out/
|
||
''; # */
|
||
};
|
||
|
||
# The udev configuration file.
|
||
conf = writeText "udev.conf" ''
|
||
udev_rules="${udevRules}"
|
||
#udev_log="debug"
|
||
'';
|
||
|
||
# Udev has a 512-character limit for ENV{PATH}, so create a symlink
|
||
# tree to work around this.
|
||
udevPath = pkgs.buildEnv {
|
||
name = "udev-path";
|
||
paths = cfg.path;
|
||
pathsToLink = [ "/bin" "/sbin" ];
|
||
ignoreCollisions = true;
|
||
};
|
||
|
||
in
|
||
|
||
{
|
||
|
||
###### interface
|
||
|
||
options = {
|
||
|
||
boot.hardwareScan = mkOption {
|
||
default = true;
|
||
description = ''
|
||
Whether to try to load kernel modules for all detected hardware.
|
||
Usually this does a good job of providing you with the modules
|
||
you need, but sometimes it can crash the system or cause other
|
||
nasty effects.
|
||
'';
|
||
};
|
||
|
||
services.udev = {
|
||
|
||
packages = mkOption {
|
||
default = [];
|
||
merge = mergeListOption;
|
||
description = ''
|
||
List of packages containing <command>udev</command> rules.
|
||
All files found in
|
||
<filename><replaceable>pkg</replaceable>/etc/udev/rules.d</filename> and
|
||
<filename><replaceable>pkg</replaceable>/lib/udev/rules.d</filename>
|
||
will be included.
|
||
'';
|
||
};
|
||
|
||
path = mkOption {
|
||
default = [];
|
||
merge = mergeListOption;
|
||
description = ''
|
||
Packages added to the <envar>PATH</envar> environment variable when
|
||
executing programs from Udev rules.
|
||
'';
|
||
};
|
||
|
||
extraRules = mkOption {
|
||
default = "";
|
||
example = ''
|
||
KERNEL=="eth*", ATTR{address}=="00:1D:60:B9:6D:4F", NAME="my_fast_network_card"
|
||
'';
|
||
type = with pkgs.lib.types; string;
|
||
description = ''
|
||
Additional <command>udev</command> rules. They'll be written
|
||
into file <filename>10-local.rules</filename>. Thus they are
|
||
read before all other rules.
|
||
'';
|
||
};
|
||
|
||
};
|
||
|
||
hardware.firmware = mkOption {
|
||
default = [];
|
||
example = [ "/root/my-firmware" ];
|
||
merge = mergeListOption;
|
||
description = ''
|
||
List of directories containing firmware files. Such files
|
||
will be loaded automatically if the kernel asks for them
|
||
(i.e., when it has detected specific hardware that requires
|
||
firmware to function). If more than one path contains a
|
||
firmware file with the same name, the first path in the list
|
||
takes precedence. Note that you must rebuild your system if
|
||
you add files to any of these directories. For quick testing,
|
||
put firmware files in /root/test-firmware and add that
|
||
directory to the list.
|
||
Note that you can also add firmware packages to this
|
||
list as these are directories in the nix store.
|
||
'';
|
||
apply = list: pkgs.buildEnv {
|
||
name = "firmware";
|
||
paths = list;
|
||
pathsToLink = [ "/" ];
|
||
ignoreCollisions = true;
|
||
};
|
||
};
|
||
|
||
};
|
||
|
||
|
||
###### implementation
|
||
|
||
config = {
|
||
|
||
services.udev.extraRules = nixosRules;
|
||
|
||
services.udev.packages = [ pkgs.udev extraUdevRules ];
|
||
|
||
services.udev.path = [ pkgs.coreutils pkgs.gnused pkgs.gnugrep pkgs.utillinux pkgs.udev ];
|
||
|
||
jobs.udev =
|
||
{ startOn = "startup";
|
||
|
||
environment = { UDEV_CONFIG_FILE = conf; };
|
||
|
||
path = [ udev ];
|
||
|
||
preStart =
|
||
''
|
||
echo "" > /proc/sys/kernel/hotplug || true
|
||
|
||
mkdir -p /var/lib/udev/rules.d
|
||
touch /var/lib/udev/rules.d/70-persistent-cd.rules /var/lib/udev/rules.d/70-persistent-net.rules
|
||
|
||
mkdir -p /dev/.udev # !!! bug in udev?
|
||
'';
|
||
|
||
daemonType = "fork";
|
||
|
||
exec = "udevd --daemon";
|
||
|
||
postStart =
|
||
''
|
||
# Do the loading of additional stage 2 kernel modules.
|
||
# This needs to be done while udevd is running, because
|
||
# the modules may call upon udev's firmware loading rule.
|
||
for i in ${toString config.boot.kernelModules}; do
|
||
echo "loading kernel module ‘$i’..."
|
||
${config.system.sbin.modprobe}/sbin/modprobe $i || true
|
||
done
|
||
'';
|
||
};
|
||
|
||
jobs.udevtrigger =
|
||
{ startOn = "started udev";
|
||
|
||
task = true;
|
||
|
||
path = [ udev ];
|
||
|
||
script =
|
||
''
|
||
# Let udev create device nodes for all modules that have already
|
||
# been loaded into the kernel (or for which support is built into
|
||
# the kernel).
|
||
udevadm trigger --action=add
|
||
udevadm settle || true # wait for udev to finish
|
||
|
||
initctl emit -n new-devices
|
||
'';
|
||
};
|
||
|
||
system.requiredKernelConfig = with config.lib.kernelConfig; [
|
||
(isEnabled "UNIX")
|
||
(isYes "INOTIFY_USER")
|
||
(isYes "NET")
|
||
];
|
||
};
|
||
|
||
}
|