internal/version/version.go

// Copyright 2022 the Cloud Run Proxy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package version

import (
	"runtime"
	"runtime/debug"
)

var (
	// name is the name of the binary.
	name string
	Name = valueOrFallback(name, func() string {
		return "cloud-run-proxy"
	})

	// version is the main package version.
	version string
	Version = valueOrFallback(version, func() string {
		if info, ok := debug.ReadBuildInfo(); ok {
			if v := info.Main.Version; v != "" {
				return v
			}
		}
		return "source"
	})

	// commit is the git sha.
	commit string
	Commit = valueOrFallback(commit, func() string {
		if info, ok := debug.ReadBuildInfo(); ok {
			for _, setting := range info.Settings {
				if setting.Key == "vcs.revision" && setting.Value != "" {
					return setting.Value
				}
			}
		}
		return "unknown"
	})

	// OSArch is the operating system and architecture combination.
	OSArch = runtime.GOOS + "/" + runtime.GOARCH

	// HumanVersion is the compiled version.
	HumanVersion = Name + " " + Version + " (" + Commit + ", " + OSArch + ")"
)

func valueOrFallback(val string, fn func() string) string {
	if val != "" {
		return val
	}
	return fn()
}