feat: Generate unique MAC address (#611)

src/network.sh

@@ -3,8 +3,8 @@ set -Eeuo pipefail
 
 # Docker environment variables
 
+: "${MAC:=""}"
 : "${DHCP:="N"}"
-: "${MAC:="02:11:32:AA:BB:CC"}"
 
 : "${VM_NET_DEV:=""}"
 : "${VM_NET_TAP:="dsm"}"
@@ -33,7 +33,7 @@ configureDHCP() {
   fi
 
   while ! ip link set "$VM_NET_TAP" up; do
-    info "Waiting for address to become available..."
+    info "Waiting for MAC address $VM_NET_MAC to become available..."
     sleep 2
   done
 
@@ -128,7 +128,7 @@ configureNAT() {
   ip address add ${VM_NET_IP%.*}.1/24 broadcast ${VM_NET_IP%.*}.255 dev dockerbridge
 
   while ! ip link set dockerbridge up; do
-    info "Waiting for address to become available..."
+    info "Waiting for IP address to become available..."
     sleep 2
   done
 
@@ -136,7 +136,7 @@ configureNAT() {
   ip tuntap add dev "$VM_NET_TAP" mode tap
 
   while ! ip link set "$VM_NET_TAP" up promisc on; do
-    info "Waiting for tap to become available..."
+    info "Waiting for TAP to become available..."
     sleep 2
   done
 
@@ -211,14 +211,20 @@ getInfo() {
     error "$ADD_ERR -e \"VM_NET_DEV=NAME\" to specify another interface name." && exit 27
   fi
 
-  VM_NET_MAC="${VM_NET_MAC//-/:}"
+  if [ -z "$VM_NET_MAC" ]; then
+    # Generate MAC address based on Docker container ID in hostname
+    VM_NET_MAC=$(echo "$HOST" | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:11:32:\3:\4:\5/')
+  fi
+
+  VM_NET_MAC="${VM_NET_MAC,,//-/:}"
+
   if [[ ${#VM_NET_MAC} == 12 ]]; then
     m="$VM_NET_MAC"
     VM_NET_MAC="${m:0:2}:${m:2:2}:${m:4:2}:${m:6:2}:${m:8:2}:${m:10:2}"
   fi
 
   if [[ ${#VM_NET_MAC} != 17 ]]; then
-    error "Invalid mac address: '$VM_NET_MAC', should be 12 or 17 digits long!" && exit 28
+    error "Invalid MAC address: '$VM_NET_MAC', should be 12 or 17 digits long!" && exit 28
   fi
 
   GATEWAY=$(ip r | grep default | awk '{print $3}')
@@ -242,15 +248,15 @@ getInfo
 html "Initializing network..."
 
 if [[ "$DEBUG" == [Yy1]* ]]; then
-  info "Container IP is $IP with gateway $GATEWAY on interface $VM_NET_DEV" && echo
+  info "Host: $HOST  IP: $IP  Gateway: $GATEWAY  Interface: $VM_NET_DEV  MAC: $VM_NET_MAC"
+  [ -f /etc/resolv.conf ] && cat /etc/resolv.conf 
+  echo
 fi
 
 if [[ "$DHCP" == [Yy1]* ]]; then
 
-  if [[ "$GATEWAY" == "172."* ]]; then
-    if [[ "$DEBUG" != [Yy1]* ]]; then
-      error "You can only enable DHCP while the container is on a macvlan network!" && exit 26
-    fi
+  if [[ "$GATEWAY" == "172."* ]] && [[ "$DEBUG" != [Yy1]* ]]; then
+    error "You can only enable DHCP while the container is on a macvlan network!" && exit 26
   fi
 
   # Configuration for DHCP IP