refactor corrosion into interface service

internal/machine/corrosion.go

@@ -0,0 +1,38 @@
+package machine
+
+import (
+	"fmt"
+	"log/slog"
+	"os/exec"
+)
+
+const (
+	CorrosionSystemdUnit = "uncloud-corrosion.service"
+)
+
+type CorrosionService interface {
+	Configure() error
+	Start() error
+}
+
+type CorrosionSystemdService struct {
+	Unit    string
+	DataDir string
+}
+
+func (s *CorrosionSystemdService) Configure() error {
+	return nil
+}
+
+func (s *CorrosionSystemdService) Start() error {
+	unit := s.Unit
+	if unit == "" {
+		unit = CorrosionSystemdUnit
+	}
+
+	if _, err := exec.Command("systemctl", "start", unit).Output(); err != nil {
+		return fmt.Errorf("start %s: %w", unit, err)
+	}
+	slog.Info("Corrosion systemd service started.", "unit", unit)
+	return nil
+}