29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
78 lines
1.5 KiB
Nix
78 lines
1.5 KiB
Nix
# Support for DRBD, the Distributed Replicated Block Device.
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{ config, lib, pkgs, ... }:
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with lib;
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let cfg = config.services.drbd; in
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{
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###### interface
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options = {
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services.drbd.enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether to enable support for DRBD, the Distributed Replicated
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Block Device.
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'';
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};
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services.drbd.config = mkOption {
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default = "";
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type = types.string;
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description = ''
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Contents of the <filename>drbd.conf</filename> configuration file.
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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.drbd ];
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services.udev.packages = [ pkgs.drbd ];
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boot.kernelModules = [ "drbd" ];
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boot.extraModprobeConfig =
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''
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options drbd usermode_helper=/run/current-system/sw/sbin/drbdadm
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'';
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environment.etc = singleton
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{ source = pkgs.writeText "drbd.conf" cfg.config;
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target = "drbd.conf";
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};
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jobs.drbd_up =
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{ name = "drbd-up";
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startOn = "stopped udevtrigger or ip-up";
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task = true;
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script =
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''
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${pkgs.drbd}/sbin/drbdadm up all
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'';
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};
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jobs.drbd_down =
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{ name = "drbd-down";
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startOn = "starting shutdown";
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task = true;
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script =
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''
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${pkgs.drbd}/sbin/drbdadm down all
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'';
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};
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};
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}
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