101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package verflag defines utility functions to handle command line flags
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// related to version of Kubernetes.
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package verflag
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import (
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"fmt"
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"os"
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"strconv"
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flag "github.com/spf13/pflag"
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"k8s.io/kubernetes/pkg/version"
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)
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type versionValue int
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const (
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VersionFalse versionValue = 0
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VersionTrue versionValue = 1
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VersionRaw versionValue = 2
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)
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const strRawVersion string = "raw"
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func (v *versionValue) IsBoolFlag() bool {
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return true
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}
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func (v *versionValue) Get() interface{} {
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return versionValue(*v)
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}
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func (v *versionValue) Set(s string) error {
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if s == strRawVersion {
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*v = VersionRaw
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return nil
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}
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boolVal, err := strconv.ParseBool(s)
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if boolVal {
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*v = VersionTrue
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} else {
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*v = VersionFalse
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}
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return err
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}
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func (v *versionValue) String() string {
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if *v == VersionRaw {
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return strRawVersion
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}
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return fmt.Sprintf("%v", bool(*v == VersionTrue))
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}
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// The type of the flag as required by the pflag.Value interface
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func (v *versionValue) Type() string {
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return "version"
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}
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func VersionVar(p *versionValue, name string, value versionValue, usage string) {
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*p = value
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flag.Var(p, name, usage)
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// "--version" will be treated as "--version=true"
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flag.Lookup(name).NoOptDefVal = "true"
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}
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func Version(name string, value versionValue, usage string) *versionValue {
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p := new(versionValue)
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VersionVar(p, name, value, usage)
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return p
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}
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var (
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versionFlag = Version("version", VersionFalse, "Print version information and quit")
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)
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// PrintAndExitIfRequested will check if the -version flag was passed
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// and, if so, print the version and exit.
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func PrintAndExitIfRequested() {
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if *versionFlag == VersionRaw {
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fmt.Printf("%#v\n", version.Get())
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os.Exit(0)
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} else if *versionFlag == VersionTrue {
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fmt.Printf("Kubernetes %s\n", version.Get())
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os.Exit(0)
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}
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}
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