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initialising network interfaces, etc.) to modules/tasks. This follows the Upstart terminology: a service is a job that doesn't usually terminate (e.g. a daemon), while a task is a job that does some work and then exits. svn path=/nixos/branches/modular-nixos/; revision=15771
79 lines
1.9 KiB
Nix
79 lines
1.9 KiB
Nix
{pkgs, config, ...}:
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let
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###### interface
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options = {
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swapDevices = pkgs.lib.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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};
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};
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###### implementation
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inherit (pkgs) utillinux lib;
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swapDevices = config.swapDevices;
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devicesByPath =
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map (x: x.device) (lib.filter (x: x ? device) swapDevices);
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devicesByLabel =
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map (x: x.label) (lib.filter (x: x ? label) swapDevices);
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in
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{
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require = [options];
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services.extraJobs = [{
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name = "swap";
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job = ''
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start on startup
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start on new-devices
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script
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for device in ${toString devicesByPath}; do
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${utillinux}/sbin/swapon "$device" || true
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done
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for label in ${toString devicesByLabel}; do
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${utillinux}/sbin/swapon -L "$label" || true
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done
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# Remove swap devices not listed in swapDevices.
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# !!! disabled because it doesn't work with labels
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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 $ {toString swapDevices}; do
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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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end script
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'';
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}];
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}
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