add version package

Author: fabriziopandini

version/version.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2018 The Kubernetes 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 (
+	"fmt"
+	"runtime"
+)
+
+var (
+	gitMajor         string // major version, always numeric
+	gitMinor         string // minor version, numeric possibly followed by "+"
+	gitVersion       string // semantic version, derived by build scripts
+	gitCommit        string // sha1 from git, output of $(git rev-parse HEAD)
+	gitReleaseCommit string // sha1 from git of the most recent tagged commit
+	gitTreeState     string // state of git tree, either "clean" or "dirty"
+	buildDate        string // build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
+)
+
+type Info struct {
+	Major        string `json:"major,omitempty"`
+	Minor        string `json:"minor,omitempty"`
+	GitVersion   string `json:"gitVersion,omitempty"`
+	GitCommit    string `json:"gitCommit,omitempty"`
+	GitTreeState string `json:"gitTreeState,omitempty"`
+	BuildDate    string `json:"buildDate,omitempty"`
+	GoVersion    string `json:"goVersion,omitempty"`
+	Compiler     string `json:"compiler,omitempty"`
+	Platform     string `json:"platform,omitempty"`
+}
+
+func Get() Info {
+	return Info{
+		Major:        gitMajor,
+		Minor:        gitMinor,
+		GitVersion:   gitVersion,
+		GitCommit:    gitCommit,
+		GitTreeState: gitTreeState,
+		BuildDate:    buildDate,
+		GoVersion:    runtime.Version(),
+		Compiler:     runtime.Compiler,
+		Platform:     fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}
+
+// String returns info as a human-friendly version string.
+func (info Info) String() string {
+	return info.GitVersion
+}