mount .go-pkg-cache for DOCKER_INCREMENTAL_BINARY

The cache was not used when we run `make binary` from the host.

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

.dockerignore

@@ -1,3 +1,4 @@
 bundles
 .gopath
 vendor/pkg
+.go-pkg-cache

.gitignore

@@ -10,6 +10,7 @@
 # a .bashrc may be added to customize the build environment
 .bashrc
 .gopath/
+.go-pkg-cache/
 autogen/
 bundles/
 cmd/dockerd/dockerd

Makefile

@@ -41,6 +41,11 @@ DOCKER_ENVS := \
 BIND_DIR := $(if $(BINDDIR),$(BINDDIR),$(if $(DOCKER_HOST),,bundles))
 DOCKER_MOUNT := $(if $(BIND_DIR),-v "$(CURDIR)/$(BIND_DIR):/go/src/github.com/docker/docker/$(BIND_DIR)")
 
+# enable .go-pkg-cache if DOCKER_INCREMENTAL_BINARY and DOCKER_MOUNT (i.e.DOCKER_HOST) are set
+PKGCACHE_DIR := $(if $(PKGCACHE_DIR),$(PKGCACHE_DIR),.go-pkg-cache)
+PKGCACHE_MAP := gopath:/go/pkg vendor:/go/src/github.com/docker/docker/vendor/pkg goroot-linux_amd64_netgo:/usr/local/go/pkg/linux_amd64_netgo
+DOCKER_MOUNT := $(if $(DOCKER_INCREMENTAL_BINARY),$(DOCKER_MOUNT) $(shell echo $(PKGCACHE_MAP) | sed -E 's@([^ ]*)@-v "$(CURDIR)/$(PKGCACHE_DIR)/\1"@g'),$(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`.
 # Note that `BIND_DIR` will already be set to `bundles` if `DOCKER_HOST` is not set (see above BIND_DIR line), in such case this will do nothing since `DOCKER_MOUNT` will already be set.
@@ -72,15 +77,18 @@ all: build ## validate all checks, build linux binaries, run all tests\ncross bu
 binary: build ## build the linux binaries
 	$(DOCKER_RUN_DOCKER) hack/make.sh binary
 
-build: bundles
+build: bundles init-go-pkg-cache
 	docker build ${DOCKER_BUILD_ARGS} -t "$(DOCKER_IMAGE)" -f "$(DOCKERFILE)" .
 
-build-gccgo: bundles
+build-gccgo: bundles init-go-pkg-cache
 	docker build ${DOCKER_BUILD_ARGS} -t "$(DOCKER_IMAGE)-gccgo" -f Dockerfile.gccgo .
 
 bundles:
 	mkdir bundles
 
+init-go-pkg-cache:
+	mkdir -p $(shell echo $(PKGCACHE_MAP) | sed -E 's@([^: ]*):[^ ]*@$(PKGCACHE_DIR)/\1@g')
+
 cross: build ## cross build the binaries for darwin, freebsd and\nwindows
 	$(DOCKER_RUN_DOCKER) hack/make.sh dynbinary binary cross