system/disks/hibernate.nix


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{pkgs}: {
  services = {
    hibernate-preparation = {
      # TODO check if they work
      wantedBy = ["systemd-hibernate.service"];
      unitConfig = {
        Description = "Enable swap file and disable zram before hibernate";
        Before = "systemd-hibernate.service";
      };
      serviceConfig = {
        Type = "oneshot";
        User = "root";
        ExecStart = "${pkgs.dash}/bin/dash -c \"${pkgs.util-linux}/bin/swapon /swap/swapfile && ${pkgs.util-linux}/bin/swapoff /dev/zram0\"";
      };
    };
    hibernate-resume = {
      wantedBy = ["hibernate.target"];
      unitConfig = {
        Description = "Disable swap after resuming from hibernation";
        After = "hibernate.target";
      };
      serviceConfig = {
        Type = "oneshot";
        User = "root";
        ExecStart = "${pkgs.util-linux}/bin/swapoff /swap/swapfile";
      };
    };
    swapoff-start = {
      wantedBy = ["multi-user.target"];
      unitConfig = {
        Description = "Disable hardware swap after booting";
      };
      serviceConfig = {
        Type = "oneshot";
        User = "root";
        ExecStart = "${pkgs.util-linux}/bin/swapoff /swap/swapfile";
      };
    };
    systemd-hibernate.serviceConfig.Environment = "SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1";
    systemd-logind.serviceConfig.Environment = "SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1";
  };
}