70 lines
2.9 KiB
Nix
70 lines
2.9 KiB
Nix
# eg25-manager: <https://gitlab.com/mobian1/eg25-manager>
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# - used by sxmo, in <configs/default_hooks/sxmo_hook_restart_modem_daemons.sh>
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# - requires modemmanager (ModemManager.service)
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{ config, lib, pkgs, ... }:
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let
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cfg = config.sane.services.eg25-manager;
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eg25-config-toml = pkgs.writeText "eg25-manager-config.toml" ''
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# config here is applied *on top of* the per-device configs shipped by eg25-manager.
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# these values take precedence, but there's no need to redefine things if we don't want them changed
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[at]
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uart = "/dev/ttyUSB2"
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'';
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in
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{
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options.sane.services.eg25-manager = with lib; {
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enable = mkEnableOption "Quectel EG25 modem manager service";
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package = mkOption {
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type = types.package;
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default = pkgs.eg25-manager;
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};
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};
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config = lib.mkIf cfg.enable {
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# eg25-manager package ships udev rules *and* a systemd service.
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# for that reason, i think it needs to be on the system path for the systemd service to be enabled.
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services.udev.packages = [ cfg.package ];
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# but actually, let's define our own systemd service so that we can control config
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systemd.services.eg25-manager = {
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serviceConfig = {
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Type = "simple";
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ExecStart = "${cfg.package}/bin/eg25-manager --config ${eg25-config-toml}";
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ExecStartPre = pkgs.writeShellScript "unload-modem-power" ''
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# see issue: <https://gitlab.com/mobian1/eg25-manager/-/issues/38>
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${pkgs.kmod}/bin/modprobe -r modem_power && echo "WARNING: kernel configured with CONFIG_MODEM_POWER=y, may be incompatible with eg25-manager" || true
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'';
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Restart = "on-failure";
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RestartSec = "60s"; # can make this more frequent once stable?
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# sandboxing (taken from the service file shipped by eg25-manager):
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# TODO: this is too strict and breaks access to e.g. /dev/ttyUSB2!
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# ProtectControlGroups = true;
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# ProtectHome = true;
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# ProtectSystem = "strict";
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# RestrictSUIDSGID = true;
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# PrivateTmp = true;
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# MemoryDenyWriteExecute = true;
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# PrivateMounts = true;
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# NoNewPrivileges = true;
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# CapabilityBoundingSet = [ "" ];
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# LockPersonality = true;
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};
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before = [ "ModemManager.service" ];
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wantedBy = [ "multi-user.target" ];
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};
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# systemd.packages = [ pkgs.eg25-manager ];
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# systemd.services.eg25-manager.wantedBy = [ "multi-user.target" ];
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# systemd.services.prepare-eg25-manager = {
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# description = "unload megi's modem_power module to provide gpio access to eg25-manager";
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# serviceConfig.Type = "oneshot";
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# wantedBy = [ "eg25-manager.service" ];
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# before = [ "eg25-manager.service" ];
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# script = ''
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# ${pkgs.kmod}/bin/modprobe -r modem_power && echo "WARNING: kernel configured with CONFIG_MODEM_POWER=y, may be incompatible with eg25-manager" || true
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# '';
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# };
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};
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}
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