nixpkgs/upstart-jobs/swap.nix

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{utillinux, swapDevices}:
{
name = "swap";
job = "
start on startup
start on new-devices
script
for device in ${toString swapDevices}; do
# !!! Check whether we are already swapping to $device.
${utillinux}/sbin/swapon \"$device\" || true
done
# Remove swap devices not listed in swapDevices.
for used in $(cat /proc/swaps | grep '^/' | sed 's/ .*//'); do
found=
for device in ${toString swapDevices}; do
if test \"$used\" = \"$device\"; then found=1; fi
done
if test -z \"$found\"; then
${utillinux}/sbin/swapoff \"$used\" || true
fi
done
end script
";
}