nixpkgs/modules/config/swap.nix

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{ config, pkgs, ... }:
with pkgs.lib;
{
###### interface
options = {
swapDevices = mkOption {
default = [];
example = [
{ device = "/dev/hda7"; }
{ device = "/var/swapfile"; }
{ label = "bigswap"; }
];
description = ''
The swap devices and swap files. These must have been
initialised using <command>mkswap</command>. Each element
should be an attribute set specifying either the path of the
swap device or file (<literal>device</literal>) or the label
of the swap device (<literal>label</literal>, see
<command>mkswap -L</command>). Using a label is
recommended.
'';
type = types.list types.optionSet;
options = {config, options, ...}: {
options = {
device = mkOption {
example = "/dev/sda3";
type = types.string;
description = "Path of the device.";
};
label = mkOption {
example = "swap";
type = types.string;
description = ''
Label of the device. Can be used instead of <varname>device</varname>.
'';
};
};
config = {
device =
if options.label.isDefined then
"/dev/disk/by-label/${config.label}"
else
mkNotdef;
};
};
};
};
}