nixpkgs/modules/services/hardware/hal.nix

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# HAL daemon.
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.hal;
inherit (pkgs) hal;
fdi = pkgs.buildEnv {
name = "hal-fdi";
pathsToLink = [ "/share/hal/fdi" ];
paths = cfg.packages;
};
in
{
###### interface
options = {
services.hal = {
enable = mkOption {
default = false;
description = ''
Whether to start the HAL daemon.
'';
};
packages = mkOption {
default = [];
description = ''
Packages containing additional HAL configuration data.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ hal ];
services.hal.packages = [ hal pkgs.hal_info ];
security.policykit.enable = true;
users.extraUsers = singleton
{ name = "haldaemon";
uid = config.ids.uids.haldaemon;
description = "HAL daemon user";
};
users.extraGroups = singleton
{ name = "haldaemon";
gid = config.ids.gids.haldaemon;
};
jobs.hal =
{ description = "HAL daemon";
startOn = "started dbus" + optionalString config.services.acpid.enable " and started acpid";
environment =
{ # !!! HACK? These environment variables manipulated inside
# 'src'/hald/mmap_cache.c are used for testing the daemon.
HAL_FDI_SOURCE_PREPROBE = "${fdi}/share/hal/fdi/preprobe";
HAL_FDI_SOURCE_INFORMATION = "${fdi}/share/hal/fdi/information";
HAL_FDI_SOURCE_POLICY = "${fdi}/share/hal/fdi/policy";
# Stuff needed by the shell scripts run by HAL (in particular pm-utils).
HALD_RUNNER_PATH = concatStringsSep ":"
[ "${pkgs.coreutils}/bin"
"${pkgs.gnugrep}/bin"
"${pkgs.dbus_tools}/bin"
"${pkgs.procps}/bin"
"${pkgs.procps}/sbin"
"${config.system.sbin.modprobe}/sbin"
"${pkgs.module_init_tools}/bin"
"${pkgs.module_init_tools}/sbin"
"${pkgs.kbd}/bin"
];
};
preStart =
''
mkdir -m 0755 -p /var/cache/hald
mkdir -m 0755 -p /var/run/hald
rm -f /var/cache/hald/fdi-cache
'';
daemonType = "fork";
# The `PATH=' works around a bug in HAL: it concatenates
# its libexec directory to $PATH, but using a 512-byte
# buffer. So if $PATH is too long it fails.
script = "PATH= exec ${hal}/sbin/hald --use-syslog";
};
services.udev.packages = [hal];
services.dbus.enable = true;
services.dbus.packages = [hal];
};
}