nixpkgs/modules/tasks/filesystems/nfs.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
inInitrd = any (fs: fs == "nfs") config.boot.initrd.supportedFilesystems;
nfsStateDir = "/var/lib/nfs";
rpcMountpoint = "${nfsStateDir}/rpc_pipefs";
idmapdConfFile = {
target = "idmapd.conf";
source = 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
{
###### interface
options = {
services.nfs.client.enable = mkOption {
default = any (fs: fs.fsType == "nfs" || fs.fsType == "nfs4") config.fileSystems;
description = ''
Whether to enable support for mounting NFS filesystems.
'';
};
};
###### implementation
config = mkIf config.services.nfs.client.enable {
services.rpcbind.enable = true;
system.fsPackages = [ pkgs.nfsUtils ];
boot.initrd.kernelModules = mkIf inInitrd [ "nfs" ];
boot.initrd.extraUtilsCommands = mkIf inInitrd
''
# !!! Uh, why don't we just install mount.nfs?
cp -v ${pkgs.klibc}/lib/klibc/bin.static/nfsmount $out/bin
'';
environment.etc = singleton idmapdConfFile;
jobs.statd =
{ description = "Kernel NFS server - Network Status Monitor";
path = [ pkgs.nfsUtils pkgs.sysvtools pkgs.utillinux ];
stopOn = ""; # needed during shutdown
preStart =
''
ensure rpcbind
mkdir -p ${nfsStateDir}/sm
mkdir -p ${nfsStateDir}/sm.bak
sm-notify -d
'';
daemonType = "fork";
exec = "rpc.statd --no-notify";
};
jobs.idmapd =
{ description = "Kernel NFS server - ID Map Daemon";
path = [ pkgs.nfsUtils pkgs.sysvtools pkgs.utillinux ];
stopOn = "starting shutdown";
preStart =
''
ensure rpcbind
mkdir -p ${rpcMountpoint}
mount -t rpc_pipefs rpc_pipefs ${rpcMountpoint}
'';
postStop =
''
umount ${rpcMountpoint}
'';
daemonType = "fork";
exec = "rpc.idmapd";
};
};
}