mirror of
https://github.com/kubereboot/kured.git
synced 2026-08-28 05:47:23 +00:00
Merge pull request #464 from dkulchinsky/viper_env_vars
bind environment variables to cobra flags with viper
This commit is contained in:
Christian Kotzbauer
+57
-9
@@ -16,6 +16,8 @@ import (
|
||||
papi "github.com/prometheus/client_golang/api"
|
||||
log "github.com/sirupsen/logrus"
|
||||
"github.com/spf13/cobra"
|
||||
"github.com/spf13/pflag"
|
||||
"github.com/spf13/viper"
|
||||
v1 "k8s.io/api/core/v1"
|
||||
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
||||
"k8s.io/apimachinery/pkg/types"
|
||||
@@ -65,6 +67,7 @@ var (
|
||||
podSelectors []string
|
||||
rebootCommand string
|
||||
logFormat string
|
||||
nodeID string
|
||||
|
||||
rebootDays []string
|
||||
rebootStart string
|
||||
@@ -87,6 +90,8 @@ const (
|
||||
KuredRebootInProgressAnnotation string = "weave.works/kured-reboot-in-progress"
|
||||
// KuredMostRecentRebootNeededAnnotation is the canonical string value for the kured most-recent-reboot-needed annotation
|
||||
KuredMostRecentRebootNeededAnnotation string = "weave.works/kured-most-recent-reboot-needed"
|
||||
// EnvPrefix The environment variable prefix of all environment variables bound to our command line flags.
|
||||
EnvPrefix = "KURED"
|
||||
)
|
||||
|
||||
func init() {
|
||||
@@ -94,12 +99,24 @@ func init() {
|
||||
}
|
||||
|
||||
func main() {
|
||||
rootCmd := &cobra.Command{
|
||||
Use: "kured",
|
||||
Short: "Kubernetes Reboot Daemon",
|
||||
PreRun: flagCheck,
|
||||
Run: root}
|
||||
cmd := NewRootCommand()
|
||||
|
||||
if err := cmd.Execute(); err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
// NewRootCommand construct the Cobra root command
|
||||
func NewRootCommand() *cobra.Command {
|
||||
rootCmd := &cobra.Command{
|
||||
Use: "kured",
|
||||
Short: "Kubernetes Reboot Daemon",
|
||||
PersistentPreRunE: bindViper,
|
||||
PreRun: flagCheck,
|
||||
Run: root}
|
||||
|
||||
rootCmd.PersistentFlags().StringVar(&nodeID, "node-id", "",
|
||||
"node name kured runs on, should be passed down from spec.nodeName via KURED_NODE_ID environment variable")
|
||||
rootCmd.PersistentFlags().BoolVar(&forceReboot, "force-reboot", false,
|
||||
"force a reboot even if the drain fails or times out (default: false)")
|
||||
rootCmd.PersistentFlags().IntVar(&drainGracePeriod, "drain-grace-period", -1,
|
||||
@@ -168,9 +185,7 @@ func main() {
|
||||
rootCmd.PersistentFlags().StringVar(&logFormat, "log-format", "text",
|
||||
"use text or json log format")
|
||||
|
||||
if err := rootCmd.Execute(); err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
return rootCmd
|
||||
}
|
||||
|
||||
// temporary func that checks for deprecated slack-notification-related flags
|
||||
@@ -192,6 +207,40 @@ func flagCheck(cmd *cobra.Command, args []string) {
|
||||
}
|
||||
}
|
||||
|
||||
// bindViper initializes viper and binds command flags with environment variables
|
||||
func bindViper(cmd *cobra.Command, args []string) error {
|
||||
v := viper.New()
|
||||
|
||||
v.SetEnvPrefix(EnvPrefix)
|
||||
v.AutomaticEnv()
|
||||
bindFlags(cmd, v)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// bindFlags binds each cobra flag to its associated viper configuration (environment variable)
|
||||
func bindFlags(cmd *cobra.Command, v *viper.Viper) {
|
||||
cmd.Flags().VisitAll(func(f *pflag.Flag) {
|
||||
// Environment variables can't have dashes in them, so bind them to their equivalent keys with underscores
|
||||
if strings.Contains(f.Name, "-") {
|
||||
v.BindEnv(f.Name, flagToEnvVar(f.Name))
|
||||
}
|
||||
|
||||
// Apply the viper config value to the flag when the flag is not set and viper has a value
|
||||
if !f.Changed && v.IsSet(f.Name) {
|
||||
val := v.Get(f.Name)
|
||||
log.Infof("Binding %s command flag to environment variable: %s=%s", f.Name, flagToEnvVar(f.Name), fmt.Sprintf("%v", val))
|
||||
cmd.Flags().Set(f.Name, fmt.Sprintf("%v", val))
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// flagToEnvVar converts command flag name to equivalent environment variable name
|
||||
func flagToEnvVar(flag string) string {
|
||||
envVarSuffix := strings.ToUpper(strings.ReplaceAll(flag, "-", "_"))
|
||||
return fmt.Sprintf("%s_%s", EnvPrefix, envVarSuffix)
|
||||
}
|
||||
|
||||
// newCommand creates a new Command with stdout/stderr wired to our standard logger
|
||||
func newCommand(name string, arg ...string) *exec.Cmd {
|
||||
cmd := exec.Command(name, arg...)
|
||||
@@ -629,7 +678,6 @@ func root(cmd *cobra.Command, args []string) {
|
||||
|
||||
log.Infof("Kubernetes Reboot Daemon: %s", version)
|
||||
|
||||
nodeID := os.Getenv("KURED_NODE_ID")
|
||||
if nodeID == "" {
|
||||
log.Fatal("KURED_NODE_ID environment variable required")
|
||||
}
|
||||
|
||||
@@ -9,6 +9,8 @@ require (
|
||||
github.com/prometheus/common v0.32.1
|
||||
github.com/sirupsen/logrus v1.8.1
|
||||
github.com/spf13/cobra v1.2.1
|
||||
github.com/spf13/pflag v1.0.5
|
||||
github.com/spf13/viper v1.8.1
|
||||
github.com/stretchr/testify v1.7.0
|
||||
gotest.tools/v3 v3.0.3
|
||||
k8s.io/api v0.22.4
|
||||
|
||||
@@ -293,6 +293,7 @@ github.com/hashicorp/go-uuid v1.0.1/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/b
|
||||
github.com/hashicorp/go.net v0.0.1/go.mod h1:hjKkEWcCURg++eb33jQU7oqQcI9XDCnUzHA0oac0k90=
|
||||
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
|
||||
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
|
||||
github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
|
||||
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
|
||||
github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
|
||||
github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
|
||||
@@ -346,6 +347,7 @@ github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de/go.mod h1:zAbeS9
|
||||
github.com/lithammer/dedent v1.1.0/go.mod h1:jrXYCQtgg0nJiN+StA2KgR7w6CiQNv9Fd/Z9BP0jIOc=
|
||||
github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
|
||||
github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
|
||||
github.com/magiconair/properties v1.8.5 h1:b6kJs+EmPFMYGkow9GiUyCyOvIwYetYJ3fSaWak/Gls=
|
||||
github.com/magiconair/properties v1.8.5/go.mod h1:y3VJvCyxH9uVvJTWEGAELF3aiYNyPKd5NZ3oSwXrF60=
|
||||
github.com/mailru/easyjson v0.0.0-20190403194419-1ea4449da983/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
|
||||
github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
|
||||
@@ -379,6 +381,7 @@ github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0Qu
|
||||
github.com/mitchellh/mapstructure v0.0.0-20160808181253-ca63d7c062ee/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
|
||||
github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
|
||||
github.com/mitchellh/mapstructure v1.2.2/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
|
||||
github.com/mitchellh/mapstructure v1.4.1 h1:CpVNEelQCZBooIPDn+AR3NpivK/TIKU8bDxdASFVQag=
|
||||
github.com/mitchellh/mapstructure v1.4.1/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
|
||||
github.com/moby/spdystream v0.2.0 h1:cjW1zVyyoiM0T7b6UoySUFqzXMoqRckQtXwGPiBhOM8=
|
||||
github.com/moby/spdystream v0.2.0/go.mod h1:f7i0iNDQJ059oMTcWxx8MA/zKFIuD/lY+0GqbN2Wy8c=
|
||||
@@ -420,6 +423,7 @@ github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3I
|
||||
github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
|
||||
github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
|
||||
github.com/pelletier/go-toml v1.7.0/go.mod h1:vwGMzjaWMwyfHwgIBhI2YUM4fB6nL6lVAvS1LBMMhTE=
|
||||
github.com/pelletier/go-toml v1.9.3 h1:zeC5b1GviRUyKYd6OJPvBU/mcVDVoL1OhT17FCt5dSQ=
|
||||
github.com/pelletier/go-toml v1.9.3/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
|
||||
github.com/peterbourgon/diskv v2.0.1+incompatible h1:UBdAOUP5p4RWqPBg048CAvpKN+vxiaj6gdUUzhl4XmI=
|
||||
github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU=
|
||||
@@ -479,8 +483,10 @@ github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4k
|
||||
github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
|
||||
github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
|
||||
github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
|
||||
github.com/spf13/afero v1.6.0 h1:xoax2sJ2DT8S8xA2paPFjDCScCNeWsg75VG0DLRreiY=
|
||||
github.com/spf13/afero v1.6.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
|
||||
github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
|
||||
github.com/spf13/cast v1.3.1 h1:nFm6S0SMdyzrzcmThSipiEubIDy8WEXKNZ0UOgiRpng=
|
||||
github.com/spf13/cast v1.3.1/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
|
||||
github.com/spf13/cobra v0.0.7/go.mod h1:/6GTrnGXV9HjY+aR4k0oJ5tcvakLuG6EuKReYlHNrgE=
|
||||
github.com/spf13/cobra v1.0.0/go.mod h1:/6GTrnGXV9HjY+aR4k0oJ5tcvakLuG6EuKReYlHNrgE=
|
||||
@@ -488,6 +494,7 @@ github.com/spf13/cobra v1.1.3/go.mod h1:pGADOWyqRD/YMrPZigI/zbliZ2wVD/23d+is3pSW
|
||||
github.com/spf13/cobra v1.2.1 h1:+KmjbUw1hriSNMF55oPrkZcb27aECyrj8V2ytv7kWDw=
|
||||
github.com/spf13/cobra v1.2.1/go.mod h1:ExllRjgxM/piMAM+3tAZvg8fsklGAf3tPfi+i8t68Nk=
|
||||
github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
|
||||
github.com/spf13/jwalterweatherman v1.1.0 h1:ue6voC5bR5F8YxI5S67j9i582FU4Qvo2bmqnqMYADFk=
|
||||
github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
|
||||
github.com/spf13/pflag v0.0.0-20170130214245-9ff6c6923cff/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
|
||||
github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
|
||||
@@ -497,6 +504,7 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
|
||||
github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/yZzE=
|
||||
github.com/spf13/viper v1.6.3/go.mod h1:jUMtyi0/lB5yZH/FjyGAoH7IMNrIhlBf6pXZmbMDvzw=
|
||||
github.com/spf13/viper v1.7.0/go.mod h1:8WkrPz2fc9jxqZNCJI/76HCieCp4Q8HaLFoCha5qpdg=
|
||||
github.com/spf13/viper v1.8.1 h1:Kq1fyeebqsBfbjZj4EL7gj2IO0mMaiyjYUWcUsl2O44=
|
||||
github.com/spf13/viper v1.8.1/go.mod h1:o0Pch8wJ9BVSWGQMbra6iw0oQ5oktSIBaujf1rJH9Ns=
|
||||
github.com/stoewer/go-strcase v1.2.0/go.mod h1:IBiWB2sKIp3wVVQ3Y035++gc+knqhUQag1KpM8ahLw8=
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
@@ -510,6 +518,7 @@ github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5
|
||||
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
|
||||
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
|
||||
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
|
||||
github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
|
||||
github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
|
||||
github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
|
||||
github.com/twitchyliquid64/golang-asm v0.0.0-20190126203739-365674df15fc/go.mod h1:NoCfSFWosfqMqmmD7hApkirIK9ozpHjxRnRxs1l413A=
|
||||
@@ -941,6 +950,7 @@ gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
|
||||
gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
|
||||
gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
|
||||
gopkg.in/ini.v1 v1.55.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
|
||||
gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
|
||||
gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
|
||||
gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
|
||||
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
|
||||
|
||||
Reference in New Issue
Block a user