mirror of
https://github.com/k3s-io/k3s.git
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66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
/*
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Copyright 2018 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 globalflag
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import (
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"flag"
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"fmt"
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"os"
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"strings"
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"github.com/spf13/pflag"
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"k8s.io/component-base/logs"
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"k8s.io/klog/v2"
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)
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// AddGlobalFlags explicitly registers flags that libraries (klog, verflag, etc.) register
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// against the global flagsets from "flag" and "k8s.io/klog/v2".
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// We do this in order to prevent unwanted flags from leaking into the component's flagset.
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func AddGlobalFlags(fs *pflag.FlagSet, name string) {
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addKlogFlags(fs)
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logs.AddFlags(fs)
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fs.BoolP("help", "h", false, fmt.Sprintf("help for %s", name))
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}
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// addKlogFlags adds flags from k8s.io/klog
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func addKlogFlags(fs *pflag.FlagSet) {
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local := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
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klog.InitFlags(local)
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local.VisitAll(func(fl *flag.Flag) {
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fl.Name = normalize(fl.Name)
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fs.AddGoFlag(fl)
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})
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}
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// normalize replaces underscores with hyphens
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// we should always use hyphens instead of underscores when registering component flags
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func normalize(s string) string {
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return strings.Replace(s, "_", "-", -1)
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}
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// Register adds a flag to local that targets the Value associated with the Flag named globalName in flag.CommandLine.
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func Register(local *pflag.FlagSet, globalName string) {
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if f := flag.CommandLine.Lookup(globalName); f != nil {
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pflagFlag := pflag.PFlagFromGoFlag(f)
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pflagFlag.Name = normalize(pflagFlag.Name)
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local.AddFlag(pflagFlag)
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} else {
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panic(fmt.Sprintf("failed to find flag in global flagset (flag): %s", globalName))
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}
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}
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