core: remove unnecessary option

rook command doesn't interpret `logtostderr` option. It's OK to just
remove this option because `capnslog` outputs all logs to stdout
by default. It's better to keep `AddGoFlagSet()` call because
some libraries might define their own flags with Go's `flag` package.

Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>

cmd/rook/ceph/operator.go

@@ -17,6 +17,7 @@ limitations under the License.
 package ceph
 
 import (
+	"flag"
 	"os"
 
 	"github.com/pkg/errors"
@@ -43,7 +44,10 @@ func init() {
 	operatorCmd.Flags().BoolVar(&operator.EnableMachineDisruptionBudget, "enable-machine-disruption-budget", false, "enable fencing controllers")
 
 	flags.SetFlagsFromEnv(operatorCmd.Flags(), rook.RookEnvVarPrefix)
-	flags.SetLoggingFlags(operatorCmd.Flags())
+	operatorCmd.Flags().AddGoFlagSet(flag.CommandLine)
+	if err := operatorCmd.Flags().Parse(nil); err != nil {
+		panic(err)
+	}
 	operatorCmd.RunE = startOperator
 }
 

pkg/util/flags/flags.go

@@ -16,7 +16,6 @@ limitations under the License.
 package flags
 
 import (
-	"flag"
 	"fmt"
 	"os"
 	"regexp"
@@ -55,20 +54,6 @@ func createRequiredFlagError(name string, flags []string) error {
 	return fmt.Errorf("%s are required for %s", strings.Join(flags, ","), name)
 }
 
-func SetLoggingFlags(flags *pflag.FlagSet) {
-	//Add commandline flags to the flagset. We will always write to stderr
-	//and not to a file by default
-	flags.AddGoFlagSet(flag.CommandLine)
-	if err := flags.Set("logtostderr", "true"); err != nil {
-		// TODO: fix me
-		// 2021-09-02 09:41:29.645366 I | op-flags: failed to set flag "logtostderr". no such flag -logtostderr
-		logger.Infof("failed to set flag %q. %v", "logtostderr", err)
-	}
-	if err := flags.Parse(nil); err != nil {
-		panic(err)
-	}
-}
-
 func SetFlagsFromEnv(flags *pflag.FlagSet, prefix string) {
 	var errorFlag bool
 	var err error