Code coverage for smoke tests.

Allow non-circle people to build coverage reports.

weave

@@ -86,6 +86,7 @@ exec_remote() {
         -e DOCKER_BRIDGE \
         -e PROXY_HOST="$PROXY_HOST" \
         -e WEAVE_CIDR=none \
+        -e COVERAGE \
         $WEAVEEXEC_DOCKER_ARGS $EXEC_IMAGE --local "$@"
 }
 
@@ -412,7 +413,11 @@ ask_version() {
                 echo "Unable to find $2 image." >&2
             fi
     fi
-    [ -n "$DOCKERIMAGE" ] && docker run --rm -e WEAVE_CIDR=none $DOCKERIMAGE --version
+    COVERAGE_ARGS=""
+    if [ -n "$COVERAGE" -a "$1" = "$CONTAINER_NAME" ] ; then
+        COVERAGE_ARGS="-test.coverprofile=/home/weave/cover.router.prof --"
+    fi
+    [ -n "$DOCKERIMAGE" ] && docker run --rm -e WEAVE_CIDR=none $DOCKERIMAGE $COVERAGE_ARGS --version
 }
 
 ######################################################################
@@ -1037,6 +1042,10 @@ launch_router() {
             exit 1
         fi
     fi
+    COVERAGE_ARGS=""
+    if [ -n "$COVERAGE" ] ; then
+        COVERAGE_ARGS="-test.coverprofile=/home/weave/cover.router.prof --"
+    fi
     # Set WEAVE_DOCKER_ARGS in the environment in order to supply
     # additional parameters, such as resource limits, to docker
     # when launching the weave container.
@@ -1045,7 +1054,7 @@ launch_router() {
         -v /var/run/docker.sock:/var/run/docker.sock \
         -e WEAVE_PASSWORD \
         -e WEAVE_CIDR=none \
-        $WEAVE_DOCKER_ARGS $IMAGE --iface $CONTAINER_IFNAME --port $CONTAINER_PORT --name "$PEERNAME" --nickname "$(hostname)" --ipalloc-range "$IPRANGE" "$@")
+        $WEAVE_DOCKER_ARGS $IMAGE $COVERAGE_ARGS --iface $CONTAINER_IFNAME --port $CONTAINER_PORT --name "$PEERNAME" --nickname "$(hostname)" --ipalloc-range "$IPRANGE" "$@")
     with_container_netns_or_die $CONTAINER launch
     wait_for_status $CONTAINER_NAME $HTTP_PORT
     if [ -n "$IPRANGE" ] ; then