chore(env): VPN_INTERFACE

- With retro-compatibility with `OPENVPN_INTERFACE`
- With retro-compatibility with `WIREGUARD_INTERFACE`

Dockerfile

@@ -71,6 +71,7 @@ ENV VPNSP=pia \
     # Common VPN options
     VPN_ENDPOINT_IP= \
     VPN_ENDPOINT_PORT= \
+    VPN_INTERFACE=tun0 \
     # OpenVPN
     OPENVPN_PROTOCOL=udp \
     OPENVPN_USER= \
@@ -85,13 +86,11 @@ ENV VPNSP=pia \
     OPENVPN_PROCESS_USER= \
     OPENVPN_IPV6=off \
     OPENVPN_CUSTOM_CONFIG= \
-    OPENVPN_INTERFACE=tun0 \
     # Wireguard
     WIREGUARD_PRIVATE_KEY= \
     WIREGUARD_PRESHARED_KEY= \
     WIREGUARD_PUBLIC_KEY= \
     WIREGUARD_ADDRESS= \
-    WIREGUARD_INTERFACE=wg0 \
     # VPN server filtering
     REGION= \
     COUNTRY= \

internal/configuration/sources/env/openvpn.go

@@ -51,7 +51,7 @@ func (r *Reader) readOpenVPN() (
 		return openVPN, fmt.Errorf("environment variable OPENVPN_MSSFIX: %w", err)
 	}
 
-	openVPN.Interface = os.Getenv("OPENVPN_INTERFACE")
+	_, openVPN.Interface = r.getEnvWithRetro("VPN_INTERFACE", "OPENVPN_INTERFACE")
 
 	openVPN.ProcessUser, err = r.readOpenVPNProcessUser()
 	if err != nil {

internal/configuration/sources/env/vpn.go

@@ -21,7 +21,7 @@ func (r *Reader) readVPN() (vpn settings.VPN, err error) {
 		return vpn, fmt.Errorf("cannot read OpenVPN settings: %w", err)
 	}
 
-	vpn.Wireguard, err = readWireguard()
+	vpn.Wireguard, err = r.readWireguard()
 	if err != nil {
 		return vpn, fmt.Errorf("cannot read Wireguard settings: %w", err)
 	}

internal/configuration/sources/env/wireguard.go

@@ -9,13 +9,13 @@ import (
 	"github.com/qdm12/gluetun/internal/configuration/settings"
 )
 
-func readWireguard() (wireguard settings.Wireguard, err error) {
+func (r *Reader) readWireguard() (wireguard settings.Wireguard, err error) {
 	defer func() {
 		err = unsetEnvKeys([]string{"WIREGUARD_PRIVATE_KEY", "WIREGUARD_PRESHARED_KEY"}, err)
 	}()
 	wireguard.PrivateKey = envToStringPtr("WIREGUARD_PRIVATE_KEY")
 	wireguard.PreSharedKey = envToStringPtr("WIREGUARD_PRESHARED_KEY")
-	wireguard.Interface = os.Getenv("WIREGUARD_INTERFACE")
+	_, wireguard.Interface = r.getEnvWithRetro("VPN_INTERFACE", "WIREGUARD_INTERFACE")
 	wireguard.Addresses, err = readWireguardAddresses()
 	if err != nil {
 		return wireguard, err // already wrapped

internal/portforward/state/startdata.go

@@ -10,7 +10,7 @@ type StartData struct {
 	PortForwarder provider.PortForwarder
 	Gateway       net.IP // needed for PIA
 	ServerName    string // needed for PIA
-	Interface     string // tun0 or wg0 for example
+	Interface     string // tun0 for example
 }
 
 type StartDataGetterSetter interface {