create corrosion config

internal/machine/corrosion/systemd.go

@@ -0,0 +1,36 @@
+package corrosion
+
+import (
+	"fmt"
+	"log/slog"
+	"os/exec"
+)
+
+const DefaultSystemdUnit = "uncloud-corrosion.service"
+
+type SystemdService struct {
+	DataDir string
+	Unit    string
+	User    string
+}
+
+func DefaultSystemdService(dataDir string) *SystemdService {
+	return &SystemdService{
+		DataDir: dataDir,
+		Unit:    DefaultSystemdUnit,
+		User:    DefaultUser,
+	}
+}
+
+func (s *SystemdService) Configure() error {
+	// TODO: create config.toml and schema dir in DataDir.
+	return nil
+}
+
+func (s *SystemdService) Start() error {
+	if _, err := exec.Command("systemctl", "start", s.Unit).Output(); err != nil {
+		return fmt.Errorf("systemctl start %s: %w", s.Unit, err)
+	}
+	slog.Info("Corrosion systemd service started.", "unit", s.Unit)
+	return nil
+}