Function UpdateDNSMasqStatic

internal/server/network/network_utils.go:425–599

UpdateDNSMasqStatic rebuilds the DNSMasq static allocations.

(s *state.State, networkName string)

// UpdateDNSMasqStatic rebuilds the DNSMasq static allocations.
func UpdateDNSMasqStatic(s *state.State, networkName string) error {
	// We don't want to race with ourselves here.
	dnsmasq.ConfigMutex.Lock()
	defer dnsmasq.ConfigMutex.Unlock()

	// Get all the networks.
	var networks []string
	if networkName == "" {
		var err error

		err = s.DB.Cluster.Transaction(context.TODO(), func(ctx context.Context, tx *db.ClusterTx) error {
			// Pass api.ProjectDefaultName here, as currently dnsmasq (bridged) networks do not support projects.
			networks, err = tx.GetNetworks(ctx, api.ProjectDefaultName)

			return err
		})
		if err != nil {
			return err
		}
	} else {
		networks = []string{networkName}
	}

	// Get all the instances.
	insts, err := instance.LoadNodeAll(s, instancetype.Any)
	if err != nil {
		return err
	}

	// Build a list of dhcp host entries.
	entries := map[string][][]string{}
	for _, inst := range insts {
		// Go through all its devices (including profiles).
		for deviceName, d := range inst.ExpandedDevices() {
			// Skip uninteresting entries.
			if d["type"] != "nic" {
				continue
			}

			nicType, err := nictype.NICType(s, inst.Project().Name, d)
			if err != nil || nicType != "bridged" {
				continue
			}

			// Temporarily populate parent from network setting if used.
			if d["network"] != "" {
				d["parent"] = d["network"]
			}

			// Skip devices not connected to managed networks.
			if !slices.Contains(networks, d["parent"]) {
				continue
			}

			// Fill in the hwaddr from volatile.
			d, err = inst.FillNetworkDevice(deviceName, d)
			if err != nil {
				continue