Merge pull request #1 from twosigma/shlu/addsilencemode

implement silent mode for kubexit

Author: shaoqin2

.gitignore

@@ -19,3 +19,6 @@
 
 # Test graveyard
 .graveyard
+
+# IDEs
+.idea

cmd/kubexit/main.go

@@ -3,11 +3,13 @@ package main
 import (
 	"context"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
 	"os/signal"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"syscall"
 	"time"
@@ -24,8 +26,13 @@ import (
 func main() {
 	var err error
 
-	// remove log timestamp
-	log.SetFlags(log.Flags() &^ (log.Ldate | log.Ltime))
+	if silence, _ := strconv.ParseBool(os.Getenv("KUBEXIT_SILENCE")); silence {
+		log.SetFlags(0)
+		log.SetOutput(ioutil.Discard)
+	} else {
+		// remove log timestamp
+		log.SetFlags(log.Flags() &^ (log.Ldate | log.Ltime))
+	}
 
 	args := os.Args[1:]
 	if len(args) == 0 {

go.mod

@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	github.com/fsnotify/fsnotify v1.4.9
+	golang.org/x/sys v0.7.0 // indirect
 	k8s.io/api v0.18.2
 	k8s.io/apimachinery v0.18.2
 	k8s.io/client-go v0.18.2

go.sum

@@ -143,6 +143,8 @@ golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9 h1:L2auWcuQIvxz9xSEqzESnV/QN
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191022100944-742c48ecaeb7 h1:HmbHVPwrPEKPGLAcHSrMe6+hqSUlvZU0rab6x5EXfGU=
 golang.org/x/sys v0.0.0-20191022100944-742c48ecaeb7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.0.0-20160726164857-2910a502d2bf/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=