Add BaseVersion metadata

This will make it possible to refer to our hyperledger/fabric-base*
series of images from the configuration file.  We will exploit this
later in the series to support using baseos/basejvm as a minimal
container.

Change-Id: Ic43ecf17c669f8965793471f8f6f3c2d56210d46
Signed-off-by: Greg Haskins <[email protected]>

Author: ghaskins

Makefile

@@ -45,12 +45,17 @@ PROJECT_VERSION=$(BASE_VERSION)
 endif
 
 PKGNAME = github.com/$(PROJECT_NAME)
-GO_LDFLAGS = -X $(PKGNAME)/common/metadata.Version=$(PROJECT_VERSION)
 CGO_FLAGS = CGO_CFLAGS=" "
 ARCH=$(shell uname -m)
 CHAINTOOL_RELEASE=v0.10.2
 BASEIMAGE_RELEASE=$(shell cat ./.baseimage-release)
 
+# defined in common/metadata/metadata.go
+METADATA_VAR = Version=$(PROJECT_VERSION)
+METADATA_VAR += BaseVersion=$(BASEIMAGE_RELEASE)
+
+GO_LDFLAGS = $(patsubst %,-X $(PKGNAME)/common/metadata.%,$(METADATA_VAR))
+
 CHAINTOOL_URL ?= https://github.com/hyperledger/fabric-chaintool/releases/download/$(CHAINTOOL_RELEASE)/chaintool
 
 export GO_LDFLAGS

common/metadata/metadata.go

@@ -16,4 +16,6 @@ limitations under the License.
 
 package metadata
 
-var Version string // defined by the Makefile and passed in with ldflags
+// Variables defined by the Makefile and passed in with ldflags
+var Version string
+var BaseVersion string

core/container/util/dockerutil.go

@@ -58,7 +58,8 @@ func getArch() string {
 func parseDockerfileTemplate(template string) string {
 	r := strings.NewReplacer(
 		"$(ARCH)", getArch(),
-		"$(PROJECT_VERSION)", metadata.Version)
+		"$(PROJECT_VERSION)", metadata.Version,
+		"$(BASE_VERSION)", metadata.BaseVersion)
 
 	return r.Replace(template)
 }