mirror of https://github.com/k3s-io/k3s
85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
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/*
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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 options
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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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// libs that provide registration functions
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"k8s.io/apiserver/pkg/util/logs"
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"k8s.io/kubernetes/pkg/version/verflag"
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// ensure libs have a chance to globally register their flags
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_ "k8s.io/klog"
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)
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// AddGlobalFlags explicitly registers flags that libraries (glog, verflag, etc.) register
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// against the global flagsets from "flag" and "github.com/spf13/pflag".
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// We do this in order to prevent unwanted flags from leaking into the Kubelet's flagset.
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func AddGlobalFlags(fs *pflag.FlagSet) {
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addGlogFlags(fs)
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addCadvisorFlags(fs)
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verflag.AddFlags(fs)
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logs.AddFlags(fs)
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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 kubelet 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 global
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func register(global *flag.FlagSet, local *pflag.FlagSet, globalName string) {
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if f := global.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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// registerDeprecated registers the flag with register, and then marks it deprecated
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func registerDeprecated(global *flag.FlagSet, local *pflag.FlagSet, globalName, deprecated string) {
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register(global, local, globalName)
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local.Lookup(normalize(globalName)).Deprecated = deprecated
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}
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// addGlogFlags adds flags from k8s.io/klog
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func addGlogFlags(fs *pflag.FlagSet) {
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// lookup flags in global flag set and re-register the values with our flagset
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global := flag.CommandLine
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local := pflag.NewFlagSet(os.Args[0], pflag.ExitOnError)
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register(global, local, "logtostderr")
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register(global, local, "alsologtostderr")
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register(global, local, "v")
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register(global, local, "stderrthreshold")
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register(global, local, "vmodule")
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register(global, local, "log_backtrace_at")
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register(global, local, "log_dir")
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register(global, local, "log_file")
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fs.AddFlagSet(local)
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}
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