Move kubernetes package into internal

coordinator/internal/kubernetes/k8sapi/systemd.go

@@ -0,0 +1,68 @@
+package k8sapi
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/coreos/go-systemd/v22/dbus"
+)
+
+func restartSystemdUnit(ctx context.Context, unit string) error {
+	conn, err := dbus.NewSystemdConnectionContext(ctx)
+	if err != nil {
+		return fmt.Errorf("establishing systemd connection: %w", err)
+	}
+
+	restartChan := make(chan string)
+	if _, err := conn.RestartUnitContext(ctx, unit, "replace", restartChan); err != nil {
+		return fmt.Errorf("restarting systemd unit %q: %w", unit, err)
+	}
+
+	// Wait for the restart to finish and actually check if it was
+	// successful or not.
+	result := <-restartChan
+
+	switch result {
+	case "done":
+		return nil
+
+	default:
+		return fmt.Errorf("restarting systemd unit %q failed: expected %v but received %v", unit, "done", result)
+	}
+}
+
+func startSystemdUnit(ctx context.Context, unit string) error {
+	conn, err := dbus.NewSystemdConnectionContext(ctx)
+	if err != nil {
+		return fmt.Errorf("establishing systemd connection: %w", err)
+	}
+
+	startChan := make(chan string)
+	if _, err := conn.StartUnitContext(ctx, unit, "replace", startChan); err != nil {
+		return fmt.Errorf("starting systemd unit %q: %w", unit, err)
+	}
+
+	// Wait for the enable to finish and actually check if it was
+	// successful or not.
+	result := <-startChan
+
+	switch result {
+	case "done":
+		return nil
+
+	default:
+		return fmt.Errorf("starting systemd unit %q failed: expected %v but received %v", unit, "done", result)
+	}
+}
+
+func enableSystemdUnit(ctx context.Context, unitPath string) error {
+	conn, err := dbus.NewSystemdConnectionContext(ctx)
+	if err != nil {
+		return fmt.Errorf("establishing systemd connection: %w", err)
+	}
+
+	if _, _, err := conn.EnableUnitFilesContext(ctx, []string{unitPath}, true, true); err != nil {
+		return fmt.Errorf("enabling systemd unit %q: %w", unitPath, err)
+	}
+	return nil
+}