3bbbd62cbc
This is necessary to prevent a race. Udev 197 has a new naming scheme for network devices, so it will rename (say) eth0 to eno0. This fails with "error changing net interface name eth0 to eno1: Device or resource busy" if another process has opened the interface in the meantime.
135 lines
3.9 KiB
Nix
135 lines
3.9 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.networking.wireless;
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configFile = "/etc/wpa_supplicant.conf";
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ifaces =
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cfg.interfaces ++
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optional (config.networking.WLANInterface != "") config.networking.WLANInterface;
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in
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{
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###### interface
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options = {
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networking.WLANInterface = mkOption {
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default = "";
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description = "Obsolete. Use <option>networking.wireless.interfaces</option> instead.";
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};
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networking.wireless = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to start <command>wpa_supplicant</command> to scan for
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and associate with wireless networks. Note: NixOS currently
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does not generate <command>wpa_supplicant</command>'s
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configuration file, <filename>${configFile}</filename>. You
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should edit this file yourself to define wireless networks,
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WPA keys and so on (see
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<citerefentry><refentrytitle>wpa_supplicant.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>).
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'';
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};
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interfaces = mkOption {
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default = [];
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example = [ "wlan0" "wlan1" ];
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description = ''
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The interfaces <command>wpa_supplicant</command> will use. If empty, it will
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automatically use all wireless interfaces. (Note that auto-detection is currently
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broken on Linux 3.4.x kernels. See http://github.com/NixOS/nixos/issues/10 for
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further details.)
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'';
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};
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driver = mkOption {
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default = "";
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example = "nl80211";
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description = "Force a specific wpa_supplicant driver.";
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};
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userControlled = {
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enable = mkOption {
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default = false;
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description = ''
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Allow normal users to control wpa_supplicant through wpa_gui or wpa_cli.
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This is useful for laptop users that switch networks a lot.
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When you want to use this, make sure ${configFile} doesn't exist.
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It will be created for you.
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Currently it is also necessary to explicitly specify networking.wireless.interfaces.
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'';
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};
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group = mkOption {
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default = "wheel";
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example = "network";
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type = types.string;
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description = "Members of this group can control wpa_supplicant.";
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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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environment.systemPackages = [ pkgs.wpa_supplicant ];
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services.dbus.packages = [ pkgs.wpa_supplicant ];
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jobs.wpa_supplicant =
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{ description = "WPA Supplicant";
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wantedBy = [ "network.target" ];
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after = [ "systemd-udev-settle.service" ];
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path = [ pkgs.wpa_supplicant ];
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preStart = ''
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touch -a ${configFile}
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chmod 600 ${configFile}
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'' + optionalString cfg.userControlled.enable ''
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if [ ! -s ${configFile} ]; then
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echo "ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=${cfg.userControlled.group}" >> ${configFile}
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echo "update_config=1" >> ${configFile}
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fi
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'';
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script =
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''
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${if ifaces == [] then ''
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for i in $(cd /sys/class/net && echo *); do
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if [ -e /sys/class/net/$i/wireless ]; then
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ifaces="$ifaces''${ifaces:+ -N} -i$i"
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fi
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done
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'' else ''
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ifaces="${concatStringsSep " -N " (map (i: "-i${i}") ifaces)}"
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''}
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exec wpa_supplicant -s -u ${optionalString (cfg.driver != "") "-D${cfg.driver}"} -c ${configFile} $ifaces
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'';
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};
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powerManagement.resumeCommands =
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''
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${config.system.build.systemd}/bin/systemctl try-restart wpa_supplicant
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'';
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assertions = [{ assertion = !cfg.userControlled.enable || cfg.interfaces != [];
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message = "user controlled wpa_supplicant needs explicit networking.wireless.interfaces";}];
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};
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}
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