nixpkgs/upstart-jobs/alsa.nix

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# ALSA sound support.
{pkgs, config}:
###### interface
let
inherit (pkgs.lib) mkOption;
options = {
sound = {
enable = mkOption {
default = true;
description = "
Whether to enable ALSA sound.
";
merge = pkgs.lib.mergeEnableOption;
};
};
};
in
###### implementation
let
ifEnable = pkgs.lib.ifEnable config.sound.enable;
# dangerous !
modprobe = config.system.sbin.modprobe;
inherit (pkgs) alsaUtils;
soundState = "/var/lib/alsa/asound.state";
# Alsalib seems to require the existence of this group, even if it's
# not used (e.g., doesn't own any devices).
group = {
name = "audio";
gid = (import ../system/ids.nix).gids.audio;
};
job = {
name = "alsa";
job = ''
start on udev
stop on shutdown
start script
mkdir -m 0755 -p $(dirname ${soundState})
# Load some additional modules.
for mod in snd_pcm_oss; do
${modprobe}/sbin/modprobe $mod || true
done
# Restore the sound state.
${alsaUtils}/sbin/alsactl -f ${soundState} restore
end script
respawn sleep 1000000 # !!! hack
stop script
# Save the sound state.
${alsaUtils}/sbin/alsactl -f ${soundState} store
end script
'';
};
in
{
require = [
(import ../upstart-jobs/default.nix) # config.services.extraJobs
# (import ../system/user.nix) # users.*
# (import ?) # config.environment.extraPackages
options
];
environment = {
extraPackages = ifEnable [alsaUtils];
};
users = {
extraGroups = ifEnable [group];
};
services = {
extraJobs = ifEnable [job];
};
}