Prove that docker network order is dict based and compose order is not respected

network-order.sh

#!/bin/bash

# autogenerate compose file avoiding file name colisions in the current directory
COMPOSE_FILE_NAME=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 10).xml
cat << EOF > ${COMPOSE_FILE_NAME}
version: "3.4"

services:
  alpine:
    image: alpine
    command: sleep 120
    networks:
      - zw2
      - nw0
      - hw1
      - nw3
networks:
  nw0:
  hw1:
  zw2:
  nw3:
EOF

# pull the image
echo "Pulling alpine image" && docker pull alpine > /dev/null

# autogenerate stack name avoiding stack name colision
STACK_NAME=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 3)

# deploy the stack
echo "Deploying stack ${STACK_NAME}" && docker stack deploy -c ${COMPOSE_FILE_NAME} ${STACK_NAME} > /dev/null
# insert a delay
WAIT_FOR_SERVICE=5
echo "Sleeping for ${WAIT_FOR_SERVICE} seconds..." && sleep ${WAIT_FOR_SERVICE}
# gather container name
CONTAINER_NAME=$(docker container ls -f name=${STACK_NAME}* --format '{{ .Names }}')

echo "=== Gathering container ${CONTAINER_NAME} network info ==="
for network in $(docker network ls -f name=${STACK_NAME}* --format '{{ .Name }}'); do
  network_cidr=$(docker network inspect -f '{{ (index .IPAM.Config 0).Subnet }}' ${network})
  echo "[${network}]"
  echo "cidr=${network_cidr}"
  docker exec -i ${CONTAINER_NAME} ip a | awk -v subnet=${network_cidr/0\//*\/} '$0 ~ subnet { printf "ip=%s\niface=%s\n", $2, $7}'
  echo
  order="${order}\n$(docker exec -i ${CONTAINER_NAME} ip a | awk -v subnet=${network_cidr/0\//*\/} '$0 ~ subnet { print $7}') => ${network}"
done

echo "=== Network desired mapping ==="
grep "[ ]\+networks:" -A 4 docker-compose.yml  | awk -v stack="${STACK_NAME}" '/-/ { print "eth"a++, "=>", stack"_"$2 }'
echo
echo -n "=== Network actual mapping ==="
echo -e ${order}
echo
docker --version
echo
# remove the stack
echo "Removing stack ${STACK_NAME}" && docker stack rm ${STACK_NAME} > /dev/null