clean orphaned namespaces

Signed-off-by: Ashraf Fouda <ashraf.m.fouda@gmail.com>

Author: ashraffouda

pkg/network/cleanup.go

@@ -2,6 +2,7 @@ package network
 
 import (
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 
@@ -47,3 +48,63 @@ func hasNoCarrier(interfaceName string) bool {
 func isOrphanVMTap(interfaceName string) bool {
 	return len(interfaceName) == 15 && strings.HasPrefix(interfaceName, "t-")
 }
+
+// CleanupOrphanedNamespaces removes network namespaces that start with "n-"
+// but don't have corresponding files in /var/run/cache/networkd/networks/
+func CleanupOrphanedNamespaces() error {
+	const networksDir = "/var/run/cache/networkd/networks/"
+
+	// Get list of files in the networks directory
+	validNetworkIDs := make(map[string]bool)
+	entries, err := os.ReadDir(networksDir)
+	if err != nil {
+		return fmt.Errorf("failed to read networks directory %s: %w", networksDir, err)
+	}
+
+	for _, entry := range entries {
+		if !entry.IsDir() {
+			validNetworkIDs[entry.Name()] = true
+		}
+	}
+
+	// Get list of network namespaces
+	cmd := exec.Command("ip", "netns", "list")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("failed to list network namespaces: %w", err)
+	}
+
+	lines := strings.Split(strings.TrimSpace(string(output)), "\n")
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+
+		// Parse namespace name (format: "n-EB2AJhw1cGbYf (id: 15)" or just "n-EB2AJhw1cGbYf")
+		parts := strings.Fields(line)
+		if len(parts) == 0 {
+			continue
+		}
+
+		nsName := parts[0]
+
+		// Only process namespaces that start with "n-"
+		if !strings.HasPrefix(nsName, "n-") {
+			continue
+		}
+
+		// Extract the ID part after "n-"
+		networkID := strings.TrimPrefix(nsName, "n-")
+
+		// Check if corresponding file exists in networks directory
+		if !validNetworkIDs[networkID] {
+			// Remove the orphaned namespace
+			delCmd := exec.Command("ip", "netns", "del", nsName)
+			if err := delCmd.Run(); err != nil {
+				return fmt.Errorf("failed to delete namespace %s: %w", nsName, err)
+			}
+		}
+	}
+
+	return nil
+}