WIP

Signed-off-by: Alejandro Mery <amery@jpi.io>

cmd/jpictl/env.go

@@ -16,19 +16,10 @@ var envCmd = &cobra.Command{
 			return err
 		}
 
-		_, err = m.Env(*envExport).WriteTo(os.Stdout)
-		return err
+		return m.WriteEnv(os.Stdout)
 	},
 }
 
-// Command Flags
-var (
-	envExport *bool
-)
-
 func init() {
 	rootCmd.AddCommand(envCmd)
-
-	envExport = envCmd.PersistentFlags().BoolP("export", "e", false,
-		"export generated variables")
 }

pkg/wireguard/config.go

@@ -23,16 +23,12 @@ var configTemplate = template.Must(template.New("config").Funcs(template.FuncMap
 		return strings.Join(s, sep)
 	},
 }).Parse(`[Interface]
-{{if .Interface.Name}}# Name: {{.Interface.Name}}
-{{end -}}
 Address = {{.Interface.Address}}
 PrivateKey = {{.Interface.PrivateKey}}
 ListenPort = {{.Interface.ListenPort}}
 {{- range .Peer }}
 
 [Peer]
-{{if .Name}}# Name: {{.Name}}
-{{end -}}
 PublicKey = {{.PublicKey}}
 Endpoint = {{.Endpoint}}
 AllowedIPs = {{ PrefixJoin .AllowedIPs ", "}}
@@ -68,7 +64,6 @@ func (f *Config) WriteTo(w io.Writer) (int64, error) {
 
 // InterfaceConfig represents the [Interface] section
 type InterfaceConfig struct {
-	Name       string
 	Address    netip.Addr
 	PrivateKey PrivateKey
 	ListenPort uint16
@@ -76,7 +71,6 @@ type InterfaceConfig struct {
 
 // PeerConfig represents a [Peer] section
 type PeerConfig struct {
-	Name       string
 	PublicKey  PublicKey
 	Endpoint   EndpointAddress
 	AllowedIPs []netip.Prefix

pkg/wireguard/keys.go

@@ -51,12 +51,12 @@ func (pub PublicKey) String() string {
 	}
 }
 
-// MarshalJSON encodes the key for JSON, omitting empty.
+// MarshalJSON encodes the key for JSON, omiting empty.
 func (key PrivateKey) MarshalJSON() ([]byte, error) {
 	return encodeKeyJSON(key.String())
 }
 
-// MarshalJSON encodes the key for JSON, omitting empty.
+// MarshalJSON encodes the key for JSON, omiting empty.
 func (pub PublicKey) MarshalJSON() ([]byte, error) {
 	return encodeKeyJSON(pub.String())
 }
@@ -70,12 +70,12 @@ func encodeKeyJSON(s string) ([]byte, error) {
 	return out, nil
 }
 
-// MarshalYAML encodes the key for YAML, omitting empty.
+// MarshalYAML encodes the key for YAML, omiting empty.
 func (key PrivateKey) MarshalYAML() (any, error) {
 	return encodeKeyYAML(key.String())
 }
 
-// MarshalYAML encodes the key for YAML, omitting empty.
+// MarshalYAML encodes the key for YAML, omiting empty.
 func (pub PublicKey) MarshalYAML() (any, error) {
 	return encodeKeyYAML(pub.String())
 }

pkg/zones/env.go

@@ -7,47 +7,21 @@ import (
 	"strings"
 )
 
-// Env is a shell environment factory for this cluster
-type Env struct {
-	ZoneIterator
-
-	export bool
-}
-
-// Env returns a shell environment factory
-func (m *Zones) Env(export bool) *Env {
-	return &Env{
-		ZoneIterator: m,
-		export:       export,
-	}
-}
-
-// Zones returns the list of Zone IDs
-func (m *Env) Zones() []int {
-	var zones []int
-
-	m.ForEachZone(func(z *Zone) bool {
-		zones = append(zones, z.ID)
-		return false
-	})
-
-	return zones
-}
-
-// WriteTo generates environment variables for shell scripts
-func (m *Env) WriteTo(w io.Writer) (int64, error) {
+// WriteEnv generates environment variables for shell scripts
+func (m *Zones) WriteEnv(w io.Writer) error {
 	var buf bytes.Buffer
 
-	m.writeEnvVarInts(&buf, m.Zones(), "ZONES")
+	m.writeEnvVarFn(&buf, genEnvZones, "ZONES")
 	m.ForEachZone(func(z *Zone) bool {
 		m.writeEnvZone(&buf, z)
 		return false
 	})
 
-	return buf.WriteTo(w)
+	_, err := buf.WriteTo(w)
+	return err
 }
 
-func (m *Env) writeEnvZone(w io.Writer, z *Zone) {
+func (m *Zones) writeEnvZone(w io.Writer, z *Zone) {
 	zoneID := z.ID
 
 	// ZONE{zoneID}
@@ -57,36 +31,28 @@ func (m *Env) writeEnvZone(w io.Writer, z *Zone) {
 	m.writeEnvVar(w, z.Name, "ZONE%v_%s", zoneID, "NAME")
 
 	// ZONE{zoneID}_GW
-	gateways, _ := z.GatewayIDs()
-	m.writeEnvVarInts(w, gateways, "ZONE%v_%s", zoneID, "GW")
-}
+	gatewayID := getRingZeroGatewayID(z)
+	if gatewayID > 0 {
+		m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
 
-func (m *Env) writeEnvVarInts(w io.Writer, value []int, name string, args ...any) {
-	var s string
-
-	if n := len(value); n > 0 {
-		var buf bytes.Buffer
-
-		for i, v := range value {
-			if i != 0 {
-				_, _ = fmt.Fprint(&buf, " ")
-			}
-			_, _ = fmt.Fprintf(&buf, "%v", v)
+		// ZONE{zoneID}_IP
+		if ip, ok := RingZeroAddress(zoneID, gatewayID); ok {
+			m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
 		}
-
-		s = buf.String()
 	}
-
-	m.writeEnvVar(w, s, name, args...)
 }
 
-func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
-	var prefix string
+func (m *Zones) writeEnvVarFn(w io.Writer, fn func(*Zones) string, name string, args ...any) {
+	var value string
 
-	if m.export {
-		prefix = "export "
+	if fn != nil {
+		value = fn(m)
 	}
 
+	m.writeEnvVar(w, value, name, args...)
+}
+
+func (*Zones) writeEnvVar(w io.Writer, value string, name string, args ...any) {
 	if len(args) > 0 {
 		name = fmt.Sprintf(name, args...)
 	}
@@ -94,20 +60,37 @@ func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
 	if name != "" {
 		value = strings.TrimSpace(value)
 
-		_, _ = fmt.Fprintf(w, "%s%s=%q\n", prefix, name, value)
+		_, _ = fmt.Fprintf(w, "%s=%q\n", name, value)
 	}
 }
 
+func genEnvZones(m *Zones) string {
+	s := make([]string, 0, len(m.Zones))
+	for _, z := range m.Zones {
+		s = append(s, fmt.Sprintf("%v", z.ID))
+	}
+
+	return strings.Join(s, " ")
+}
+
 func genEnvZoneNodes(z *Zone) string {
-	if n := z.Len(); n > 0 {
-		s := make([]string, 0, n)
-
-		z.ForEachMachine(func(p *Machine) bool {
-			s = append(s, p.Name)
-			return false
-		})
-
-		return strings.Join(s, " ")
+	s := make([]string, 0, len(z.Machines))
+	for _, p := range z.Machines {
+		s = append(s, p.Name)
 	}
-	return ""
+	return strings.Join(s, " ")
+}
+
+func getRingZeroGatewayID(z *Zone) int {
+	var gatewayID int
+
+	z.ForEachMachine(func(p *Machine) bool {
+		if p.IsGateway() {
+			gatewayID = p.ID
+		}
+
+		return gatewayID != 0
+	})
+
+	return gatewayID
 }

pkg/zones/machine_rings.go

@@ -3,6 +3,7 @@ package zones
 import (
 	"bytes"
 	"fmt"
+	"io/fs"
 	"os"
 
 	"darvaza.org/core"
@@ -72,6 +73,38 @@ func (m *Machine) tryReadWireguardKeys(ring int) error {
 	}
 }
 
+// WriteWireguardKeys writes the wgN.key/wgN.pub files
+func (m *Machine) WriteWireguardKeys(ring int) error {
+	var err error
+	var key, pub string
+	var ri *RingInfo
+
+	ri, _ = m.getRingInfo(ring)
+	if ri != nil {
+		key = ri.Keys.PrivateKey.String()
+		pub = ri.Keys.PublicKey.String()
+	}
+
+	switch {
+	case key == "":
+		return fs.ErrNotExist
+	case pub == "":
+		pub = ri.Keys.PrivateKey.Public().String()
+	}
+
+	err = m.WriteStringFile(key+"\n", "wg%v.key", ring)
+	if err != nil {
+		return err
+	}
+
+	err = m.WriteStringFile(pub+"\n", "wg%v.pub", ring)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // RemoveWireguardKeys deletes wgN.key and wgN.pub from
 // the machine's config directory
 func (m *Machine) RemoveWireguardKeys(ring int) error {
@@ -229,6 +262,38 @@ func (m *Machine) RemoveWireguardConfig(ring int) error {
 	return err
 }
 
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (m *Machine) SyncWireguardConfig(ring int) error {
+	return m.zone.SyncWireguardConfig(ring)
+}
+
+// WriteWireguardConfig ...
+func (m *Machine) WriteWireguardConfig(ring int) error {
+	r, err := NewRing(m.zone.zones, m.zone, ring)
+	if err != nil {
+		return err
+	}
+
+	return m.writeWireguardRingConfig(r)
+}
+
+func (m *Machine) writeWireguardRingConfig(r *Ring) error {
+	wg, err := r.ExportConfig(m)
+	if err != nil {
+		return nil
+	}
+
+	f, err := m.CreateTruncFile("wg%v.conf", r.ID)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = wg.WriteTo(f)
+	return err
+}
+
 func (m *Machine) createRingInfo(ring int, enabled bool) (*RingInfo, error) {
 	keys, err := wireguard.NewKeyPair()
 	if err != nil {

pkg/zones/rings.go

@@ -210,7 +210,6 @@ func (r *Ring) AddPeer(p *Machine) bool {
 		Address:    addr,
 		PrivateKey: ri.Keys.PrivateKey,
 		PeerConfig: wireguard.PeerConfig{
-			Name:      fmt.Sprintf("%s-%v", p.Name, r.ID),
 			PublicKey: ri.Keys.PublicKey,
 			Endpoint: wireguard.EndpointAddress{
 				Host: p.FullName(),
@@ -301,7 +300,6 @@ func (r *Ring) ExportConfig(p *Machine) (*wireguard.Config, error) {
 		case pp.Node == p:
 			// current
 			found = true
-			out.Interface.Name = pp.PeerConfig.Name
 			out.Interface.Address = pp.Address
 			out.Interface.PrivateKey = pp.PrivateKey
 		default:

pkg/zones/scan.go

@@ -93,7 +93,12 @@ func (m *Zones) scanSort() error {
 	})
 
 	m.ForEachZone(func(z *Zone) bool {
-		sort.Sort(z)
+		sort.SliceStable(z.Machines, func(i, j int) bool {
+			id1 := z.Machines[i].ID
+			id2 := z.Machines[j].ID
+			return id1 < id2
+		})
+
 		return false
 	})
 

pkg/zones/wireguard.go

@@ -1,272 +0,0 @@
-package zones
-
-import (
-	"io/fs"
-	"os"
-)
-
-var (
-	_ WireguardConfigPruner = (*Zones)(nil)
-	_ WireguardConfigPruner = (*Zone)(nil)
-	_ WireguardConfigPruner = (*Machine)(nil)
-
-	_ WireguardConfigWriter = (*Zones)(nil)
-	_ WireguardConfigWriter = (*Zone)(nil)
-	_ WireguardConfigWriter = (*Machine)(nil)
-
-	_ WireguardConfigSyncer = (*Zones)(nil)
-	_ WireguardConfigSyncer = (*Zone)(nil)
-	_ WireguardConfigSyncer = (*Machine)(nil)
-
-	_ WireguardKeysWriter = (*Zones)(nil)
-	_ WireguardKeysWriter = (*Zone)(nil)
-	_ WireguardKeysWriter = (*Machine)(nil)
-)
-
-// A WireguardConfigPruner deletes wgN.conf on all machines under
-// its scope with the specified ring disabled
-type WireguardConfigPruner interface {
-	PruneWireguardConfig(ring int) error
-}
-
-// PruneWireguardConfig removes wgN.conf files of machines with
-// the corresponding ring disabled on all zones
-func (m *Zones) PruneWireguardConfig(ring int) error {
-	return pruneWireguardConfig(m, ring)
-}
-
-// PruneWireguardConfig removes wgN.conf files of machines with
-// the corresponding ring disabled.
-func (z *Zone) PruneWireguardConfig(ring int) error {
-	return pruneWireguardConfig(z, ring)
-}
-
-func pruneWireguardConfig(m MachineIterator, ring int) error {
-	var err error
-
-	m.ForEachMachine(func(p *Machine) bool {
-		err = p.PruneWireguardConfig(ring)
-		if os.IsNotExist(err) {
-			// ignore
-			err = nil
-		}
-
-		return err != nil
-	})
-
-	return err
-}
-
-// PruneWireguardConfig deletes the wgN.conf file if its
-// presence on the ring is disabled
-func (m *Machine) PruneWireguardConfig(ring int) error {
-	_, ok := m.getRingInfo(ring)
-	if !ok {
-		return m.RemoveWireguardConfig(ring)
-	}
-
-	return nil
-}
-
-// A WireguardConfigWriter rewrites all wgN.conf on all machines under
-// its scope attached to that ring
-type WireguardConfigWriter interface {
-	WriteWireguardConfig(ring int) error
-}
-
-// WriteWireguardConfig rewrites all wgN.conf on all machines
-// attached to that ring
-func (m *Zones) WriteWireguardConfig(ring int) error {
-	switch ring {
-	case 0:
-		return writeWireguardConfig(m, m, ring)
-	case 1:
-		var err error
-		m.ForEachZone(func(z *Zone) bool {
-			err = writeWireguardConfig(m, z, ring)
-			return err != nil
-		})
-		return err
-	default:
-		return fs.ErrInvalid
-	}
-}
-
-// WriteWireguardConfig rewrites all wgN.conf on all machines
-// on the Zone attached to that ring
-func (z *Zone) WriteWireguardConfig(ring int) error {
-	switch ring {
-	case 0:
-		return writeWireguardConfig(z.zones, z.zones, ring)
-	case 1:
-		return writeWireguardConfig(z.zones, z, ring)
-	default:
-		return fs.ErrInvalid
-	}
-}
-
-func writeWireguardConfig(z ZoneIterator, m MachineIterator, ring int) error {
-	r, err := NewRing(z, m, ring)
-	if err != nil {
-		return err
-	}
-
-	r.ForEachMachine(func(p *Machine) bool {
-		err = p.writeWireguardRingConfig(r)
-		return err != nil
-	})
-
-	return err
-}
-
-// WriteWireguardConfig rewrites the wgN.conf file of this Machine
-// if enabled
-func (m *Machine) WriteWireguardConfig(ring int) error {
-	r, err := NewRing(m.zone.zones, m.zone, ring)
-	if err != nil {
-		return err
-	}
-
-	return m.writeWireguardRingConfig(r)
-}
-
-func (m *Machine) writeWireguardRingConfig(r *Ring) error {
-	wg, err := r.ExportConfig(m)
-	if err != nil {
-		return nil
-	}
-
-	f, err := m.CreateTruncFile("wg%v.conf", r.ID)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	_, err = wg.WriteTo(f)
-	return err
-}
-
-// A WireguardConfigSyncer updates all wgN.conf on all machines under
-// its scope reflecting the state of the ring
-type WireguardConfigSyncer interface {
-	SyncWireguardConfig(ring int) error
-}
-
-// SyncWireguardConfig updates all wgN.conf files for the specified
-// ring
-func (m *Zones) SyncWireguardConfig(ring int) error {
-	switch ring {
-	case 0:
-		return syncWireguardConfig(m, m, ring)
-	case 1:
-		var err error
-		m.ForEachZone(func(z *Zone) bool {
-			err = syncWireguardConfig(m, z, ring)
-			return err != nil
-		})
-		return err
-	default:
-		return fs.ErrInvalid
-	}
-}
-
-// SyncWireguardConfig updates all wgN.conf files for the specified
-// ring
-func (z *Zone) SyncWireguardConfig(ring int) error {
-	switch ring {
-	case 0:
-		return syncWireguardConfig(z.zones, z.zones, ring)
-	case 1:
-		return syncWireguardConfig(z.zones, z, ring)
-	default:
-		return fs.ErrInvalid
-	}
-}
-
-func syncWireguardConfig(z ZoneIterator, m MachineIterator, ring int) error {
-	r, err := NewRing(z, m, ring)
-	if err != nil {
-		return err
-	}
-
-	r.ForEachMachine(func(p *Machine) bool {
-		if _, ok := p.getRingInfo(ring); ok {
-			err = p.writeWireguardRingConfig(r)
-		} else {
-			err = p.RemoveWireguardConfig(ring)
-		}
-		return err != nil
-	})
-
-	return err
-}
-
-// SyncWireguardConfig updates all wgN.conf files for the specified
-// ring
-func (m *Machine) SyncWireguardConfig(ring int) error {
-	return m.zone.SyncWireguardConfig(ring)
-}
-
-// A WireguardKeysWriter writes the Wireguard Keys for all machines
-// under its scope for the specified ring
-type WireguardKeysWriter interface {
-	WriteWireguardKeys(ring int) error
-}
-
-// WriteWireguardKeys rewrites all wgN.{key,pub} files
-func (m *Zones) WriteWireguardKeys(ring int) error {
-	return writeWireguardKeys(m, ring)
-}
-
-// WriteWireguardKeys rewrites all wgN.{key,pub} files on this zone
-func (z *Zone) WriteWireguardKeys(ring int) error {
-	return writeWireguardKeys(z, ring)
-}
-
-func writeWireguardKeys(m MachineIterator, ring int) error {
-	var err error
-
-	m.ForEachMachine(func(p *Machine) bool {
-		err = p.WriteWireguardKeys(ring)
-		if os.IsNotExist(err) {
-			// ignore
-			err = nil
-		}
-
-		return err != nil
-	})
-
-	return err
-}
-
-// WriteWireguardKeys writes the wgN.key/wgN.pub files
-func (m *Machine) WriteWireguardKeys(ring int) error {
-	var err error
-	var key, pub string
-	var ri *RingInfo
-
-	ri, _ = m.getRingInfo(ring)
-	if ri != nil {
-		key = ri.Keys.PrivateKey.String()
-		pub = ri.Keys.PublicKey.String()
-	}
-
-	switch {
-	case key == "":
-		return fs.ErrNotExist
-	case pub == "":
-		pub = ri.Keys.PrivateKey.Public().String()
-	}
-
-	err = m.WriteStringFile(key+"\n", "wg%v.key", ring)
-	if err != nil {
-		return err
-	}
-
-	err = m.WriteStringFile(pub+"\n", "wg%v.pub", ring)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}

pkg/zones/zone_rings.go

@@ -0,0 +1,121 @@
+package zones
+
+import (
+	"io/fs"
+	"os"
+)
+
+var (
+	_ machineRinger = (*Zone)(nil)
+	_ machineRinger = (*Zones)(nil)
+)
+
+type machineRinger interface {
+	MachineIterator
+
+	PruneWireguardConfig(ring int) error
+}
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (z *Zone) SyncWireguardConfig(ring int) error {
+	switch ring {
+	case 0:
+		return syncWireguardConfig(z.zones, z.zones, ring)
+	case 1:
+		return syncWireguardConfig(z.zones, z, ring)
+	default:
+		return fs.ErrInvalid
+	}
+}
+
+// PruneWireguardConfig removes wgN.conf files of machines with
+// the corresponding ring disabled.
+func (z *Zone) PruneWireguardConfig(ring int) error {
+	return pruneWireguardConfig(z, ring)
+}
+
+// WriteWireguardKeys rewrites all wgN.{key,pub} files on this zone
+func (z *Zone) WriteWireguardKeys(ring int) error {
+	return writeWireguardKeys(z, ring)
+}
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (m *Zones) SyncWireguardConfig(ring int) error {
+	switch ring {
+	case 0:
+		return syncWireguardConfig(m, m, ring)
+	case 1:
+		var err error
+		m.ForEachZone(func(z *Zone) bool {
+			err = syncWireguardConfig(m, z, ring)
+			return err != nil
+		})
+		return err
+	default:
+		return fs.ErrInvalid
+	}
+}
+
+// PruneWireguardConfig removes wgN.conf files of machines with
+// the corresponding ring disabled on all zones
+func (m *Zones) PruneWireguardConfig(ring int) error {
+	return pruneWireguardConfig(m, ring)
+}
+
+// WriteWireguardKeys rewrites all wgN.{key,pub} files
+func (m *Zones) WriteWireguardKeys(ring int) error {
+	return writeWireguardKeys(m, ring)
+}
+
+func syncWireguardConfig(z ZoneIterator, m machineRinger, ring int) error {
+	err := m.PruneWireguardConfig(ring)
+	if err != nil {
+		return err
+	}
+
+	r, err := NewRing(z, m, ring)
+	if err != nil {
+		return err
+	}
+
+	m.ForEachMachine(func(p *Machine) bool {
+		if _, ok := p.getRingInfo(ring); ok {
+			err = p.writeWireguardRingConfig(r)
+		}
+		return err != nil
+	})
+
+	return err
+}
+
+func pruneWireguardConfig(m MachineIterator, ring int) error {
+	var err error
+
+	m.ForEachMachine(func(p *Machine) bool {
+		_, ok := p.getRingInfo(ring)
+		if !ok {
+			err = p.RemoveWireguardConfig(ring)
+		}
+		return err != nil
+	})
+
+	return err
+}
+
+func writeWireguardKeys(m MachineIterator, ring int) error {
+	var err error
+
+	m.ForEachMachine(func(p *Machine) bool {
+		err = p.WriteWireguardKeys(ring)
+		if os.IsNotExist(err) {
+			// ignore
+			err = nil
+		}
+
+		return err != nil
+	})
+
+	return err
+}

pkg/zones/zones.go

@@ -4,7 +4,6 @@ package zones
 import (
 	"io/fs"
 	"path/filepath"
-	"sort"
 
 	"github.com/hack-pad/hackpadfs/os"
 
@@ -12,9 +11,6 @@ import (
 )
 
 var (
-	_ MachineIterator = Machines(nil)
-	_ sort.Interface  = Machines(nil)
-
 	_ MachineIterator = (*Zone)(nil)
 	_ MachineIterator = (*Zones)(nil)
 	_ ZoneIterator    = (*Zones)(nil)
@@ -30,62 +26,6 @@ type ZoneIterator interface {
 	ForEachZone(func(*Zone) bool)
 }
 
-// Machines is a list of Machine objects
-type Machines []*Machine
-
-// ForEachMachine calls a function for each Machine in the list
-// until instructed to terminate the loop
-func (m Machines) ForEachMachine(fn func(*Machine) bool) {
-	for _, p := range m {
-		if fn(p) {
-			return
-		}
-	}
-}
-
-// Len returns the number of machines in the list
-func (m Machines) Len() int {
-	return len(m)
-}
-
-// Less implements sort.Interface to sort the list
-func (m Machines) Less(i, j int) bool {
-	a, b := m[i], m[j]
-	za, zb := a.Zone(), b.Zone()
-
-	switch {
-	case za == zb:
-		return a.ID < b.ID
-	default:
-		return za < zb
-	}
-}
-
-// Swap implements sort.Interface to sort the list
-func (m Machines) Swap(i, j int) {
-	m[i], m[j] = m[j], m[i]
-}
-
-// FilterMachines produces a subset of the machines offered by the given
-// iterator fulfilling a condition
-func FilterMachines(m MachineIterator, cond func(*Machine) bool) (Machines, int) {
-	var out []*Machine
-
-	if cond == nil {
-		// unconditional
-		cond = func(*Machine) bool { return true }
-	}
-
-	m.ForEachMachine(func(p *Machine) bool {
-		if cond(p) {
-			out = append(out, p)
-		}
-		return false
-	})
-
-	return out, len(out)
-}
-
 // Zone represents one zone in a cluster
 type Zone struct {
 	zones *Zones
@@ -93,13 +33,23 @@ type Zone struct {
 	ID   int    `toml:"id"`
 	Name string `toml:"name"`
 
-	Machines `toml:"machines"`
+	Machines []*Machine `toml:"machines"`
 }
 
 func (z *Zone) String() string {
 	return z.Name
 }
 
+// ForEachMachine calls a function for each Machine in the zone
+// until instructed to terminate the loop
+func (z *Zone) ForEachMachine(fn func(*Machine) bool) {
+	for _, p := range z.Machines {
+		if fn(p) {
+			return
+		}
+	}
+}
+
 // SetGateway configures a machine to be the zone's ring0 gateway
 func (z *Zone) SetGateway(gatewayID int, enabled bool) error {
 	var err error
@@ -125,19 +75,6 @@ func (z *Zone) SetGateway(gatewayID int, enabled bool) error {
 	}
 }
 
-// GatewayIDs returns the list of IDs of machines that act as ring0 gateways
-func (z *Zone) GatewayIDs() ([]int, int) {
-	var out []int
-	z.ForEachMachine(func(p *Machine) bool {
-		if p.IsGateway() {
-			out = append(out, p.ID)
-		}
-		return false
-	})
-
-	return out, len(out)
-}
-
 // Zones represents all zones in a cluster
 type Zones struct {
 	dir      fs.FS