Set DOCKER_BINDDIR mount options from env
Adds `DOCKER_BINDDIR_MOUNT_OPTS` to easily tweak the BINDDIR mount
options... primarily adding so I can control the caching mode for
osxfs because compiling takes > 1min for me with the default and < 30s
with both `cached` and `delegated`.
@@ -79,6 +79,7 @@ BIND_DIR := $(if $(BINDDIR),$(BINDDIR),$(if $(DOCKER_HOST),,bundles))
# DOCKER_MOUNT can be overriden, but use at your own risk!
ifndef DOCKER_MOUNT
DOCKER_MOUNT := $(if $(BIND_DIR),-v "$(CURDIR)/$(BIND_DIR):/go/src/github.com/docker/docker/$(BIND_DIR)")
+DOCKER_MOUNT := $(if $(DOCKER_BINDDIR_MOUNT_OPTS),$(DOCKER_MOUNT):$(DOCKER_BINDDIR_MOUNT_OPTS),$(DOCKER_MOUNT))
# This allows the test suite to be able to run without worrying about the underlying fs used by the container running the daemon (e.g. aufs-on-aufs), so long as the host running the container is running a supported fs.
# The volume will be cleaned up when the container is removed due to `--rm`.
