git.delta.rocks / jrsonnet / refs/commits / e9e8e99657ad

1{config, ...}: {2  # TODO: Make it work with systemd-initrd approach.3  # In this case we can't just switch generation and re-run activation script, since the root filesystem might not be4  # mounted yet. We need to explicitly remove the last generation, and this needs deeper integration with systemd/grub/5  # whatever user uses. boot.json also might help here.67  systemd.services.rollback-watchdog = {8    description = "Rollback watchdog";9    script = ''10      set -eux11      if [ -f /etc/fleet_rollback_marker ]; then12        echo "found the rollback marker, switching to older generation"13        target=$(cat /etc/fleet_rollback_marker)14        echo "rolling back profile"15        nix profile rollback --profile /nix/var/nix/profiles/system --to "$target"16        echo "executing activation script"17        "/nix/var/nix/profiles/system-$target-link/bin/switch-to-configuration" switch || true18        echo "removing rollback marker"19        rm -f /etc/fleet_rollback_marker20      else21        echo "rollback marker was removed, upgrade is succeeded"22      fi23    '';24    path = [25      # Should have nix-command support26      config.nix.package27    ];28    serviceConfig.Type = "exec";29    unitConfig = {30      X-StopOnRemoval = false;31      X-RestartIfChanged = false;32      X-StopIfChanged = false;33    };34  };3536  systemd.timers.rollback-watchdog = {37    description = "Timer for rollback watchdog";38    wantedBy = ["timers.target"];39    timerConfig = {40      OnActiveSec = "3min";41      RemainAfterElapse = false;42    };43    unitConfig = {44      ConditionPathExists = "/etc/fleet_rollback_marker";45    };46  };47}