[FAB-4351] Add version cmd to cryptogen

We need to print out the version info
for cryptogen.  This adds a version
command:  cryptogen version

Note that the metadata package is
self-contained in case we decide to
move cryptogen to its own repo in
the future.

Change-Id: Icce83bb125cd9b8c7b8b6ae534fe330cf151e115
Signed-off-by: Gari Singh <gari.r.singh@gmail.com>

Makefile

@@ -289,6 +289,8 @@ release: $(patsubst %,release/%, $(shell go env GOOS)-$(shell go env GOARCH))
 # builds release packages for all target platforms
 release-all: $(patsubst %,release/%, $(RELEASE_PLATFORMS))
 
+release/%: GO_LDFLAGS=-X $(pkgmap.$(@F))/metadata.Version=$(PROJECT_VERSION)
+
 release/windows-amd64: GOOS=windows
 release/windows-amd64: GO_TAGS+= nopkcs11
 release/windows-amd64: $(patsubst %,release/windows-amd64/bin/%, $(RELEASE_PKGS)) release/windows-amd64/install

common/tools/cryptogen/main.go

@@ -30,6 +30,7 @@ import (
 	"io/ioutil"
 
 	"github.com/hyperledger/fabric/common/tools/cryptogen/ca"
+	"github.com/hyperledger/fabric/common/tools/cryptogen/metadata"
 	"github.com/hyperledger/fabric/common/tools/cryptogen/msp"
 )
 
@@ -198,6 +199,8 @@ var (
 	configFile = gen.Flag("config", "The configuration template to use").File()
 
 	showtemplate = app.Command("showtemplate", "Show the default configuration template")
+
+	version = app.Command("version", "Show version information")
 )
 
 func main() {
@@ -212,6 +215,10 @@ func main() {
 	case showtemplate.FullCommand():
 		fmt.Print(defaultConfig)
 		os.Exit(0)
+
+	// "version" command
+	case version.FullCommand():
+		printVersion()
 	}
 
 }
@@ -537,3 +544,7 @@ func copyFile(src, dst string) error {
 	}
 	return cerr
 }
+
+func printVersion() {
+	fmt.Println(metadata.GetVersionInfo())
+}

common/tools/cryptogen/metadata/metadata.go

@@ -0,0 +1,32 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package metadata
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// package-scoped variables
+
+// Package version
+var Version string
+
+// package-scoped constants
+
+// Program name
+const ProgramName = "cryptogen"
+
+func GetVersionInfo() string {
+	if Version == "" {
+		Version = "development build"
+	}
+
+	return fmt.Sprintf("%s:\n Version: %s\n Go version: %s\n OS/Arch: %s",
+		ProgramName, Version, runtime.Version(),
+		fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH))
+}

common/tools/cryptogen/metadata/metadata_test.go

@@ -0,0 +1,26 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package metadata_test
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+
+	"github.com/hyperledger/fabric/common/tools/cryptogen/metadata"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetVersionInfo(t *testing.T) {
+	testVersion := "TestVersion"
+	metadata.Version = testVersion
+
+	expected := fmt.Sprintf("%s:\n Version: %s\n Go version: %s\n OS/Arch: %s",
+		metadata.ProgramName, testVersion, runtime.Version(),
+		fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH))
+	assert.Equal(t, expected, metadata.GetVersionInfo())
+}