docker-engine: new package

Docker is a platform to build, ship, and run applications in portable
containers.

Signed-off-by: Christian Stewart <christian@paral.in>
[Thomas: drop LIBRARY_PATH, as suggested by Christian.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/docker-engine/docker-engine.mk

@@ -0,0 +1,107 @@
+################################################################################
+#
+# docker-engine
+#
+################################################################################
+
+DOCKER_ENGINE_VERSION = v1.12.0-rc4
+DOCKER_ENGINE_SITE = $(call github,docker,docker,$(DOCKER_ENGINE_VERSION))
+
+DOCKER_ENGINE_LICENSE = Apache-2.0
+DOCKER_ENGINE_LICENSE_FILES = LICENSE
+
+DOCKER_ENGINE_DEPENDENCIES = host-go
+
+DOCKER_ENGINE_GOPATH = "$(@D)/vendor"
+DOCKER_ENGINE_MAKE_ENV = $(HOST_GO_TARGET_ENV) \
+	CGO_ENABLED=1 \
+	CGO_NO_EMULATION=1 \
+	GOBIN="$(@D)/bin" \
+	GOPATH="$(DOCKER_ENGINE_GOPATH)"
+
+DOCKER_ENGINE_GLDFLAGS = \
+	-X main.GitCommit=$(DOCKER_ENGINE_VERSION) \
+	-X main.Version=$(DOCKER_ENGINE_VERSION)
+
+ifeq ($(BR2_STATIC_LIBS),y)
+DOCKER_ENGINE_GLDFLAGS += -extldflags '-static'
+endif
+
+DOCKER_ENGINE_BUILD_TAGS = cgo exclude_graphdriver_zfs autogen
+DOCKER_ENGINE_BUILD_TARGETS = docker
+
+ifeq ($(BR2_PACKAGE_LIBSECCOMP),y)
+DOCKER_ENGINE_BUILD_TAGS += seccomp
+DOCKER_ENGINE_DEPENDENCIES += libseccomp
+endif
+
+ifeq ($(BR2_PACKAGE_DOCKER_ENGINE_DAEMON),y)
+DOCKER_ENGINE_BUILD_TAGS += daemon
+DOCKER_ENGINE_BUILD_TARGETS += dockerd
+endif
+
+ifeq ($(BR2_PACKAGE_DOCKER_ENGINE_EXPERIMENTAL),y)
+DOCKER_ENGINE_BUILD_TAGS += experimental
+endif
+
+ifeq ($(BR2_PACKAGE_DOCKER_ENGINE_DRIVER_BTRFS),y)
+DOCKER_ENGINE_DEPENDENCIES += btrfs-progs
+else
+DOCKER_ENGINE_BUILD_TAGS += exclude_graphdriver_btrfs
+endif
+
+ifeq ($(BR2_PACKAGE_DOCKER_ENGINE_DRIVER_DEVICEMAPPER),y)
+DOCKER_ENGINE_DEPENDENCIES += lvm2
+else
+DOCKER_ENGINE_BUILD_TAGS += exclude_graphdriver_devicemapper
+endif
+
+ifeq ($(BR2_PACKAGE_DOCKER_ENGINE_DRIVER_VFS),y)
+DOCKER_ENGINE_DEPENDENCIES += gvfs
+else
+DOCKER_ENGINE_BUILD_TAGS += exclude_graphdriver_vfs
+endif
+
+define DOCKER_ENGINE_CONFIGURE_CMDS
+	ln -fs $(@D) $(DOCKER_ENGINE_GOPATH)/src/github.com/docker/docker
+	cd $(@D) && \
+		GITCOMMIT="unknown" BUILDTIME="$$(date)" VERSION="$(DOCKER_ENGINE_VERSION)" \
+		bash ./hack/make/.go-autogen
+endef
+
+ifeq ($(BR2_PACKAGE_DOCKER_ENGINE_DAEMON),y)
+
+define DOCKER_ENGINE_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 0644 $(@D)/contrib/init/systemd/docker.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/docker.service
+	$(INSTALL) -D -m 0644 $(@D)/contrib/init/systemd/docker.socket \
+		$(TARGET_DIR)/usr/lib/systemd/system/docker.socket
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/
+	ln -fs ../../../../usr/lib/systemd/system/docker.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/docker.service
+endef
+
+define DOCKER_ENGINE_USERS
+	- - docker -1 * - - - Docker Application Container Framework
+endef
+
+endif
+
+define DOCKER_ENGINE_BUILD_CMDS
+	$(foreach target,$(DOCKER_ENGINE_BUILD_TARGETS), \
+		cd $(@D); $(DOCKER_ENGINE_MAKE_ENV) \
+		$(HOST_DIR)/usr/bin/go build -v \
+			-o $(@D)/bin/$(target) \
+			-tags "$(DOCKER_ENGINE_BUILD_TAGS)" \
+			-ldflags "$(DOCKER_ENGINE_GLDFLAGS)" \
+			./cmd/$(target)
+	)
+endef
+
+define DOCKER_ENGINE_INSTALL_TARGET_CMDS
+	$(foreach target,$(DOCKER_ENGINE_BUILD_TARGETS), \
+		$(INSTALL) -D -m 0755 $(@D)/bin/$(target) $(TARGET_DIR)/usr/bin/$(target)
+	)
+endef
+
+$(eval $(generic-package))