add basepath, remove old, configs, reload networkd

internal/networkd/apply.go

@@ -1,20 +1,31 @@
 package networkd
 
 import (
+	"bytes"
 	"fmt"
 	"os"
+	"os/exec"
+	"path/filepath"
 
+	"golang.org/x/exp/slog"
 	"nfsense.net/nfsense/internal/definitions"
 )
 
+const basepath = "/etc/systemd/network"
+
 func ApplyNetworkdConfiguration(currentConfig definitions.Config, pendingConfig definitions.Config) error {
 	files, err := GenerateNetworkdConfiguration(pendingConfig)
 	if err != nil {
 		return fmt.Errorf("Generating Networkd Configuration: %w", err)
 	}
 
+	err = RemoveContents(basepath)
+	if err != nil {
+		return fmt.Errorf("Removing old Config Files: %w", err)
+	}
+
 	for _, file := range files {
-		f, err := os.Create("out/" + file.Name)
+		f, err := os.Create(basepath + "/" + file.Name)
 		if err != nil {
 			return fmt.Errorf("creating File: %w", err)
 		}
@@ -29,5 +40,36 @@ func ApplyNetworkdConfiguration(currentConfig definitions.Config, pendingConfig
 			return fmt.Errorf("syncing File: %w", err)
 		}
 	}
+
+	cmd := exec.Command("systemctl", "restart", "systemd-networkd")
+
+	var out bytes.Buffer
+	cmd.Stdout = &out
+
+	err = cmd.Run()
+	if err != nil {
+		return fmt.Errorf("restarting networkd: %w", err)
+	}
+	slog.Info("networkd output", "out", out.String())
+
+	return nil
+}
+
+func RemoveContents(dir string) error {
+	d, err := os.Open(dir)
+	if err != nil {
+		return err
+	}
+	defer d.Close()
+	names, err := d.Readdirnames(-1)
+	if err != nil {
+		return err
+	}
+	for _, name := range names {
+		err = os.RemoveAll(filepath.Join(dir, name))
+		if err != nil {
+			return err
+		}
+	}
 	return nil
 }