Make Scope work on Docker for Mac (#1414)

* Check if Docker for Mac is used and run app separately

* Improve `check_probe_only`

* Fix d4m detection

scope

@@ -2,6 +2,8 @@
 
 set -eu
 
+ARGS="$@"
+
 usage() {
     echo "Usage:"
     echo "scope launch [<peer> ...]"
@@ -22,6 +24,7 @@ IMAGE_VERSION=${VERSION:-$IMAGE_VERSION}
 SCOPE_IMAGE_NAME=weaveworks/scope
 SCOPE_IMAGE=$SCOPE_IMAGE_NAME:$IMAGE_VERSION
 SCOPE_CONTAINER_NAME=weavescope
+SCOPE_APP_CONTAINER_NAME=weavescope-app
 IP_REGEXP="[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
 IP_ADDR_CMD="find /sys/class/net -type l | xargs -n1 basename | grep -vE 'docker|veth|lo' | \
     xargs -n1 ip addr show | grep inet | awk '{ print \$2 }' | grep -oE '$IP_REGEXP'"
@@ -61,6 +64,17 @@ check_docker_version() {
     fi
 }
 
+check_probe_only() {
+  echo "${ARGS}" | grep -q -E "\-\-no\-app|\-\-service\-token|\-\-probe\-only"
+}
+
+check_docker_for_mac() {
+  docker_for_mac_network_mode="${HOME}/Library/Containers/com.docker.docker/Data/database/com.docker.driver.amd64-linux/network"
+  [ "$(uname)" = "Darwin" ] \
+    && [ -S /var/run/docker.sock ] \
+    && grep -q hybrid $docker_for_mac_network_mode 2>/dev/null
+}
+
 # Check that a container named $1 with image $2 is not running
 check_not_running() {
     case $(docker inspect --format='{{.State.Running}} {{.Config.Image}}' $1 2>/dev/null) in
@@ -97,6 +111,13 @@ launch_command() {
             $WEAVESCOPE_DOCKER_ARGS $SCOPE_IMAGE --probe.docker=true "$@"
 }
 
+launch_app_command() {
+    echo docker run -d --name=$SCOPE_APP_CONTAINER_NAME \
+            -e CHECKPOINT_DISABLE \
+            -p 0.0.0.0:4040:4040 \
+            $WEAVESCOPE_DOCKER_ARGS $SCOPE_IMAGE --no-probe "$@"
+}
+
 check_docker_version
 
 case "$COMMAND" in
@@ -128,18 +149,38 @@ EOF
         ;;
 
     launch)
-        check_not_running $SCOPE_CONTAINER_NAME $SCOPE_IMAGE_NAME
-        docker rm -f $SCOPE_CONTAINER_NAME >/dev/null 2>&1 || true
+        if ! check_docker_for_mac || check_probe_only ; then
+            check_not_running $SCOPE_CONTAINER_NAME $SCOPE_IMAGE_NAME
+            docker rm -f $SCOPE_CONTAINER_NAME >/dev/null 2>&1 || true
+            CONTAINER=$($(launch_command "$@"))
+            echo $CONTAINER
+        elif check_docker_for_mac ; then
+            # Docker for Mac (as of beta9) does not ship vmnet driver and
+            # thereby only access container ports via a tunnel, preventing
+            # access to host ports of the VM.
+            # - https://github.com/weaveworks/scope/issues/1411
+            # - https://forums.docker.com/t/ports-in-host-network-namespace-are-not-accessible/10789
+            check_not_running $SCOPE_APP_CONTAINER_NAME $SCOPE_IMAGE_NAME
+            docker rm -f $SCOPE_APP_CONTAINER_NAME >/dev/null 2>&1 || true
+            CONTAINER=$($(launch_app_command "$@"))
+            echo $CONTAINER
+            app_ip=$(docker inspect -f '{{.NetworkSettings.IPAddress}}' "${CONTAINER}")
+            check_not_running $SCOPE_CONTAINER_NAME $SCOPE_IMAGE_NAME
+            docker rm -f $SCOPE_CONTAINER_NAME >/dev/null 2>&1 || true
+            CONTAINER=$($(launch_command --no-app "$@" "${app_ip}:4040"))
+            echo $CONTAINER
+        fi
 
-        CONTAINER=$($(launch_command "$@"))
-        echo $CONTAINER
-
-        if ! echo "$@" | grep -E "\-\-no\-app|\-\-service\-token" 1>/dev/null; then
+        if ! check_probe_only ; then
             IP_ADDRS=$(docker run --rm --net=host --entrypoint /bin/sh $SCOPE_IMAGE -c "$IP_ADDR_CMD")
             echo "Weave Scope is reachable at the following URL(s):" >&2
-            for ip in $IP_ADDRS; do
-                echo "  * http://$ip:4040/" >&2
-            done
+            if ! check_docker_for_mac ; then
+                for ip in $IP_ADDRS; do
+                    echo "  * http://$ip:4040/" >&2
+                done
+            else
+                echo "  * http://localhost:4040/" >&2
+            fi
         fi
         ;;
 
@@ -148,6 +189,11 @@ EOF
         if ! docker stop $SCOPE_CONTAINER_NAME >/dev/null 2>&1 ; then
             echo "Weave Scope is not running." >&2
         fi
+        if check_docker_for_mac ; then
+            if ! docker stop $SCOPE_APP_CONTAINER_NAME >/dev/null 2>&1 ; then
+                echo "Weave Scope app is not running." >&2
+            fi
+        fi
         ;;
 
     *)