Merge pull request #134 from oasisprotocol/tjanez/show-oasis-core-ver…

…sion

Get Oasis Core's version from Oasis Core Go module dependency

.changelog/134.feature.1.md

@@ -0,0 +1 @@
+common: Add `GetOasisCoreVersion()` helper for obtaining Oasis Core's version

.changelog/134.feature.2.md

@@ -0,0 +1 @@
+cli: Add `-version` flag to `oasis-core-rosetta-gateway` binary

common/version.go

@@ -3,9 +3,15 @@ package common
 
 import (
 	"runtime"
+	"runtime/debug"
 	"strings"
+
+	ocVersion "github.com/oasisprotocol/oasis-core/go/common/version"
 )
 
+// VersionUnknown represents an unknown version.
+const VersionUnknown = "unknown"
+
 var (
 	// SoftwareVersion represents the Oasis Core Rosetta Gateway's version and
 	// should be set by the linker.
@@ -18,3 +24,21 @@ var (
 	// ToolchainVersion is the version of the Go compiler/standard library.
 	ToolchainVersion = strings.TrimPrefix(runtime.Version(), "go")
 )
+
+// GetOasisCoreVersion returns the version of the Oasis Core dependency or
+// unknown if it can't be obtained.
+func GetOasisCoreVersion() string {
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		return VersionUnknown
+	}
+
+	for _, dep := range bi.Deps {
+		if dep.Path == "github.com/oasisprotocol/oasis-core/go" {
+			// Convert Go Modules compatible version to Oasis Core's canonical
+			// version.
+			return ocVersion.ConvertGoModulesVersion(dep.Version)
+		}
+	}
+	return VersionUnknown
+}

main.go

@@ -139,6 +139,8 @@ func getPortOrExit() int {
 // Print version information.
 func printVersionInfo() {
 	fmt.Printf("Software version: %s\n", common.SoftwareVersion)
+	fmt.Printf("Oasis Core:\n")
+	fmt.Printf("  Software version: %s\n", common.GetOasisCoreVersion())
 	fmt.Printf("Rosetta API version: %s\n", common.RosettaAPIVersion)
 	fmt.Printf("Go toolchain version: %s\n", common.ToolchainVersion)
 }