133 lines
3.3 KiB
Nix
133 lines
3.3 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) cryptsetup utillinux;
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in
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{
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###### interface
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options = {
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swapDevices = mkOption {
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default = [];
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example = [
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{ device = "/dev/hda7"; }
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{ device = "/var/swapfile"; }
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{ label = "bigswap"; }
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];
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description = ''
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The swap devices and swap files. These must have been
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initialised using <command>mkswap</command>. Each element
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should be an attribute set specifying either the path of the
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swap device or file (<literal>device</literal>) or the label
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of the swap device (<literal>label</literal>, see
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<command>mkswap -L</command>). Using a label is
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recommended.
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'';
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type = types.list types.optionSet;
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options = {config, options, ...}: {
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options = {
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device = mkOption {
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example = "/dev/sda3";
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type = types.string;
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description = ''
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Path of the device.
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'';
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};
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label = mkOption {
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example = "swap";
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type = types.string;
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description = "
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Label of the device. Can be used instead of <varname>device</varname>.
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";
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};
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cipher = mkOption {
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default = false;
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example = true;
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type = types.bool;
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description = "
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Cipher the swap device to protect swapped data. This option
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does not work with labels.
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";
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};
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command = mkOption {
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description = "
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Command used to activate the swap device.
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";
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};
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};
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config = {
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device =
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if options.label.isDefined then
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"/dev/disk/by-label/${config.label}"
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else
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mkNotdef;
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command = ''
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if test -e "${config.device}"; then
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${if config.cipher then ''
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plainDevice="${config.device}"
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name="crypt$(echo "$plainDevice" | sed -e 's,/,.,g')"
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device="/dev/mapper/$name"
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if ! test -e "$device"; then
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${cryptsetup}/sbin/cryptsetup -c aes -s 128 -d /dev/urandom create "$name" "$plainDevice"
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${utillinux}/sbin/mkswap -f "$device" || true
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fi
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''
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else ''
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device="${config.device}"
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''
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}
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device=$(readlink -f "$device")
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# Add new swap devices.
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if echo $unused | grep -q "^$device\$"; then
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unused="$(echo $unused | grep -v "^$device\$" || true)"
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else
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${utillinux}/sbin/swapon "$device" || true
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fi
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fi
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'';
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};
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};
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};
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};
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###### implementation
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config = {
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jobs.swap =
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{ task = true;
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startOn = ["startup" "new-devices"];
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script =
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''
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unused="$(sed '1d; s/ .*//' /proc/swaps)"
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${toString (map (x: x.command) config.swapDevices)}
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# Remove remaining swap devices.
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test -n "$unused" && ${utillinux}/sbin/swapoff $unused || true
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'';
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};
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};
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}
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