Improve logging output for network configuration setup

cmd/apply.go

@@ -30,9 +30,9 @@ import (
 
 // applyCmd represents the apply command
 var applyCmd = &cobra.Command{
-	Use:     "apply",
-	Short:   "Apply netns networks configuration to running system",
-	Long:    "Apply netns networks configuration to running system",
+	Use:   "apply",
+	Short: "Apply netns networks configuration to running system",
+	Long:  "Apply netns networks configuration to running system",
 	RunE: func(cmd *cobra.Command, args []string) error {
 		for netns, values := range cfg.Netns {
 			if ip.NetnsExists(netns) {
@@ -70,24 +70,27 @@ var applyCmd = &cobra.Command{
 }
 
 func SetupDevice(name string, addresses []string) error {
+	slog.Info("add addresses", "name", name, "addresses", addresses)
+
 	for _, address := range addresses {
 		err := ip.AddAddress(name, address)
 		if err != nil {
 			return err
 		}
 	}
 
-	err := ip.SetLinkUp(name)
-	if err != nil {
-		return err
-	}
+	return SetLinkUp(name)
+}
 
-	return nil
+func SetLinkUp(name string) error {
+	slog.Info("link up", "name", "lo", "netns", ip.Netns())
+
+	return ip.SetLinkUp(name)
 }
 
 func SetupLoopback(netns string) error {
 	return ip.IntoNetns(netns, func() error {
-		return ip.SetLinkUp("lo")
+		return SetLinkUp("lo")
 	})
 }
 
@@ -108,6 +111,7 @@ func SetupEthernets(netns string, ethernets map[string]config.EthernetConfig) er
 func SetupDummyDevices(netns string, devices map[string]config.EthernetConfig) error {
 	for name, values := range devices {
 		ip.IntoNetns(netns, func() error {
+			slog.Info("add dummy device", "name", name, "netns", netns)
 			err := ip.AddDummyDevice(name)
 			if err != nil {
 				return err
@@ -124,6 +128,7 @@ func SetupVethDevices(netns string, devices map[string]config.VethDeviceConfig)
 		peerName := values.Peer.Name
 		peerNetns := values.Peer.Netns
 
+		slog.Info("add veth device", "name", name, "netns", netns, "peer name", peerName, "peer netns", peerNetns)
 		err := ip.AddVethDevice(name, peerName)
 		if err != nil {
 			return err

iproute2/iproute2.go

@@ -123,6 +123,13 @@ func (i *Iproute2) IntoNetns(netns string, fn func() error) error {
 	return err
 }
 
+func (i *Iproute2) Netns() string {
+	if i.useNetns {
+		return i.netns
+	}
+	return ""
+}
+
 func (i *Iproute2) NetnsExists(name string) bool {
 	return slices.Contains(i.ListNetns(), name)
 }