scripts: expose bridge configuration via the snap config system

scripts/anbox-bridge.sh

@@ -30,6 +30,25 @@ IPV4_NETMASK="255.255.255.0"
 IPV4_NETWORK="192.168.250.1/24"
 IPV4_NAT="true"
 
+if [ -n "$SNAP" ]; then
+    snap_ipv4_address=$(snapctl get bridge.address)
+    snap_ipv4_netmask=$(snapctl get bridge.netmask)
+    snap_ipv4_network=$(snapctl get bridge.network)
+    snap_enable_nat=$(snapctl get bridge.nat.enable)
+    if [ -n "$snap_ipv4_address" ]; then
+        IPV4_ADDR="$snap_ipv4_address"
+    fi
+    if [ -n "$snap_ipv4_netmask" ]; then
+        IPV4_NETMASK="$snap_ipv4_netmask"
+    fi
+    if [ -n "$snap_ipv4_network" ]; then
+        IPV4_NETWORK="$snap_ipv4_network"
+    fi
+    if [ "$snap_enable_nat" = false ]; then
+        IPV4_NAT="false"
+    fi
+fi
+
 use_iptables_lock="-w"
 iptables -w -L -n > /dev/null 2>&1 || use_iptables_lock=""