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8ec1958667
This explicitly registers Kubelet flags from libraries that were registering flags globally, and stops parsing the global flag set. In general, we should always be explicit about flags we register and parse, so that we maintain control over our command-line API.
109 lines
2.4 KiB
Go
109 lines
2.4 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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const versionFlagName = "version"
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var (
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versionFlag = Version(versionFlagName, VersionFalse, "Print version information and quit")
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)
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func AddFlags(fs *flag.FlagSet) {
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fs.AddFlag(flag.Lookup(versionFlagName))
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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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