nixos/suspend-and-hibernate.nix

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{
config,
pkgs,
...
}: let
hibernateEnvironment = {
HIBERNATE_SECONDS = "3600";
HIBERNATE_LOCK = "/var/run/autohibernate.lock";
};
in {
systemd.services."awake-after-suspend-for-a-time" = {
description = "Sets up the suspend so that it'll wake for hibernation";
wantedBy = ["suspend.target"];
before = ["systemd-suspend.service"];
environment = hibernateEnvironment;
script = ''
curtime=$(date +%s)
echo "$curtime $1" >> /tmp/autohibernate.log
echo "$curtime" > $HIBERNATE_LOCK
${pkgs.utillinux}/bin/rtcwake -m no -s $HIBERNATE_SECONDS
'';
serviceConfig.Type = "simple";
};
systemd.services."hibernate-after-recovery" = {
description = "Hibernates after a suspend recovery due to timeout";
wantedBy = ["suspend.target"];
after = ["systemd-suspend.service"];
environment = hibernateEnvironment;
script = ''
curtime=$(date +%s)
sustime=$(cat $HIBERNATE_LOCK)
rm $HIBERNATE_LOCK
if [ $(($curtime - $sustime)) -ge $HIBERNATE_SECONDS ] ; then
systemctl hibernate
else
${pkgs.utillinux}/bin/rtcwake -m no -s 1
fi
'';
serviceConfig.Type = "simple";
};
}