nixpkgs/nixos/modules/tasks/filesystems/nfs.nix

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{ config, lib, pkgs, ... }:
with lib;
let
inInitrd = any (fs: fs == "nfs") config.boot.initrd.supportedFilesystems;
nfsStateDir = "/var/lib/nfs";
rpcMountpoint = "${nfsStateDir}/rpc_pipefs";
idmapdConfFile = pkgs.writeText "idmapd.conf" ''
[General]
Pipefs-Directory = ${rpcMountpoint}
${optionalString (config.networking.domain != "")
"Domain = ${config.networking.domain}"}
[Mapping]
Nobody-User = nobody
Nobody-Group = nogroup
[Translation]
Method = nsswitch
'';
in
{
###### implementation
config = mkIf (any (fs: fs == "nfs" || fs == "nfs4") config.boot.supportedFilesystems) {
services.rpcbind.enable = true;
system.fsPackages = [ pkgs.nfsUtils ];
boot.kernelModules = [ "sunrpc" ];
boot.initrd.kernelModules = mkIf inInitrd [ "nfs" ];
systemd.services.statd =
{ description = "NFSv3 Network Status Monitor";
path = [ pkgs.nfsUtils pkgs.sysvtools pkgs.utillinux ];
wantedBy = [ "network-online.target" "multi-user.target" ];
before = [ "network-online.target" ];
requires = [ "basic.target" "rpcbind.service" ];
after = [ "basic.target" "rpcbind.service" "network.target" ];
unitConfig.DefaultDependencies = false; # don't stop during shutdown
preStart =
''
mkdir -p ${nfsStateDir}/sm
mkdir -p ${nfsStateDir}/sm.bak
sm-notify -d
'';
serviceConfig.Type = "forking";
serviceConfig.ExecStart = "@${pkgs.nfsUtils}/sbin/rpc.statd rpc.statd --no-notify";
serviceConfig.Restart = "always";
};
systemd.services.idmapd =
{ description = "NFSv4 ID Mapping Daemon";
path = [ pkgs.sysvtools pkgs.utillinux ];
wantedBy = [ "network-online.target" "multi-user.target" ];
before = [ "network-online.target" ];
requires = [ "rpcbind.service" ];
after = [ "rpcbind.service" ];
preStart =
''
mkdir -p ${rpcMountpoint}
mount -t rpc_pipefs rpc_pipefs ${rpcMountpoint}
'';
postStop =
''
umount ${rpcMountpoint}
'';
serviceConfig.Type = "forking";
serviceConfig.ExecStart = "@${pkgs.nfsUtils}/sbin/rpc.idmapd rpc.idmapd -c ${idmapdConfFile}";
serviceConfig.Restart = "always";
};
};
}