98 lines
2.2 KiB
Nix
98 lines
2.2 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) utillinux;
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toPath = x: if x.device != null then x.device else "/dev/disk/by-label/${x.label}";
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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 = {
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device = mkOption {
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default = null;
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example = "/dev/sda3";
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type = types.nullOr 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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default = null;
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example = "swap";
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type = types.nullOr 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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};
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};
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};
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###### implementation
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config = {
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jobAttrs.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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swapDevices=${toString (map toPath config.swapDevices)}
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for device in $swapDevices; do
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${utillinux}/sbin/swapon "$device" || true
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done
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# Remove swap devices not listed in swapDevices.
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for used in $(cat /proc/swaps | grep '^/' | sed 's/ .*//'); do
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found=
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for device in $swapDevices; do
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device=$(readlink -f $device)
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if test "$used" = "$device"; then found=1; fi
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done
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if test -z "$found"; then
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${utillinux}/sbin/swapoff "$used" || true
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fi
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done
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'';
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};
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};
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}
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