[release-1.28] Remove handling code for glog (#2534)

* barbican-kms-plugin: Remove unnecessary klog flag calls

The comment here seems to have been left over when this module was
extensively reworked in commit 7f1e9ed (#2278). In any case, it's
unnecessary: the call to 'klog.InitFlags' with a 'nil' argument results
in the flags being registered against the global 'flag.CommandLine'
flagset [1], but since cobra uses pflag rather than flag this doesn't
do anything useful. You can validate this by simply building the binary
without this change: you'll note that we only have '-v' and '-vmodule'
arguments, which are actually added by 'cli.Run' [2][3][4]. As such, we
can simply remove the calls.

[1] https://github.com/kubernetes/klog/blob/v2.100.1/klog.go#L432-L434
[2] https://github.com/kubernetes/component-base/blob/v0.28.1/cli/run.go#L46
[3] https://github.com/kubernetes/component-base/blob/v0.28.1/cli/run.go#L120
[4] https://github.com/kubernetes/component-base/blob/v0.28.1/logs/logs.go#L73-L105

Signed-off-by: Stephen Finucane <[email protected]>

* cinder-csi-plugin: Remove handling for glog

The kubernetes ecosystem has migrated to klog now and the flags
registered are for klog [1]. As such, there is no need to continue
translating from glog to klog.

[1] https://github.com/kubernetes/component-base/blob/v0.28.1/logs/logs.go#L73-L105

Signed-off-by: Stephen Finucane <[email protected]>

* manila-csi-plugin: Remove handling for glog

Remove the code to handle translation of legacy glog options to klog
options since glog is no longer a thing in kubernetes.

Signed-off-by: Stephen Finucane <[email protected]>

* client-keystone-auth: Remove handling for glog

As with our earlier change to cinder-csi-plugin, the handling code for
glog is no longer necessary now that the kubernetes ecosystem has
migrated to klog. However, unlike that change, client-keystone-auth is
not using cobra but rather plain old pflag. As a result, it is still
actually registering all the klog options. We preserve this behavior.

Signed-off-by: Stephen Finucane <[email protected]>

* k8s-keystone-auth: Remove handling for glog

This is quite similar but not identical to the earlier removal of glog
handling in client-keystone-auth. As with that utility, we are using
pflag rather than cobra here, but unlike that utility the klog options
are not being registered.

Signed-off-by: Stephen Finucane <[email protected]>

---------

Signed-off-by: Stephen Finucane <[email protected]>
Co-authored-by: Stephen Finucane <[email protected]>

Author: k8s-infra-cherrypick-robot

cmd/barbican-kms-plugin/main.go

@@ -17,7 +17,6 @@ limitations under the License.
 package main
 
 import (
-	"flag"
 	"os"
 	"os/signal"
 
@@ -35,12 +34,6 @@ var (
 )
 
 func main() {
-	flag.Parse()
-
-	// This is a temporary hack to enable proper logging until upstream dependencies
-	// are migrated to fully utilize klog instead of glog.
-	klog.InitFlags(nil)
-
 	cmd := &cobra.Command{
 		Use:   "barbican-kms-plugin",
 		Short: "Barbican KMS plugin for Kubernetes",

cmd/cinder-csi-plugin/main.go

@@ -17,8 +17,6 @@ limitations under the License.
 package main
 
 import (
-	"flag"
-	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -41,34 +39,9 @@ var (
 )
 
 func main() {
-	if err := flag.CommandLine.Parse([]string{}); err != nil {
-		klog.Fatalf("Unable to parse flags: %v", err)
-	}
-
 	cmd := &cobra.Command{
 		Use:   "Cinder",
 		Short: "CSI based Cinder driver",
-		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
-			// Glog requires this otherwise it complains.
-			if err := flag.CommandLine.Parse(nil); err != nil {
-				return fmt.Errorf("unable to parse flags: %w", err)
-			}
-
-			// This is a temporary hack to enable proper logging until upstream dependencies
-			// are migrated to fully utilize klog instead of glog.
-			klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
-			klog.InitFlags(klogFlags)
-
-			// Sync the glog and klog flags.
-			cmd.Flags().VisitAll(func(f1 *pflag.Flag) {
-				f2 := klogFlags.Lookup(f1.Name)
-				if f2 != nil {
-					value := f1.Value.String()
-					_ = f2.Value.Set(value)
-				}
-			})
-			return nil
-		},
 		Run: func(cmd *cobra.Command, args []string) {
 			handle()
 		},
@@ -99,7 +72,6 @@ func main() {
 }
 
 func handle() {
-
 	// Initialize cloud
 	d := cinder.NewDriver(endpoint, cluster)
 	openstack.InitOpenStackProvider(cloudConfig, httpEndpoint)

cmd/client-keystone-auth/main.go

@@ -138,24 +138,6 @@ func argumentsAreSet(url, user, project, password, domain, applicationCredential
 }
 
 func main() {
-	// Glog requires this otherwise it complains.
-	if err := flag.CommandLine.Parse(nil); err != nil {
-		klog.Fatalf("Unable to parse flags: %v", err)
-	}
-	// This is a temporary hack to enable proper logging until upstream dependencies
-	// are migrated to fully utilize klog instead of glog.
-	klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
-	klog.InitFlags(klogFlags)
-
-	// Sync the glog and klog flags.
-	flag.CommandLine.VisitAll(func(f1 *flag.Flag) {
-		f2 := klogFlags.Lookup(f1.Name)
-		if f2 != nil {
-			value := f1.Value.String()
-			_ = f2.Value.Set(value)
-		}
-	})
-
 	var url string
 	var domain string
 	var user string
@@ -186,6 +168,8 @@ func main() {
 
 	logs.AddFlags(pflag.CommandLine)
 
+	klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
+	klog.InitFlags(klogFlags)
 	pflag.CommandLine.AddGoFlagSet(klogFlags)
 
 	kflag.InitFlags()

cmd/k8s-keystone-auth/main.go

@@ -15,7 +15,6 @@ limitations under the License.
 package main
 
 import (
-	"flag"
 	"fmt"
 	"os"
 
@@ -29,32 +28,12 @@ import (
 )
 
 func main() {
-	// Glog requires this otherwise it complains.
-	err := flag.CommandLine.Parse(nil)
-	if err != nil {
-		klog.Fatalf("Unable to parse flags: %v", err)
-	}
-
 	var showVersion bool
 	pflag.BoolVar(&showVersion, "version", false, "Show current version and exit")
 
-	// This is a temporary hack to enable proper logging until upstream dependencies
-	// are migrated to fully utilize klog instead of glog.
-	klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
-	klog.InitFlags(klogFlags)
-
 	logs.AddFlags(pflag.CommandLine)
 	keystone.AddExtraFlags(pflag.CommandLine)
 
-	// Sync the glog and klog flags.
-	flag.CommandLine.VisitAll(func(f1 *flag.Flag) {
-		f2 := klogFlags.Lookup(f1.Name)
-		if f2 != nil {
-			value := f1.Value.String()
-			_ = f2.Value.Set(value)
-		}
-	})
-
 	logs.InitLogs()
 	defer logs.FlushLogs()
 

cmd/manila-csi-plugin/main.go

@@ -17,13 +17,11 @@ limitations under the License.
 package main
 
 import (
-	"flag"
 	"fmt"
 	"os"
 	"strings"
 
 	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
 	"k8s.io/cloud-provider-openstack/pkg/csi/manila"
 	"k8s.io/cloud-provider-openstack/pkg/csi/manila/csiclient"
 	"k8s.io/cloud-provider-openstack/pkg/csi/manila/manilaclient"
@@ -66,34 +64,9 @@ func validateShareProtocolSelector(v string) error {
 }
 
 func main() {
-	if err := flag.CommandLine.Parse([]string{}); err != nil {
-		klog.Fatalf("Unable to parse flags: %v", err)
-	}
-
 	cmd := &cobra.Command{
 		Use:   os.Args[0],
 		Short: "CSI Manila driver",
-		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
-			// Glog requires this otherwise it complains.
-			if err := flag.CommandLine.Parse(nil); err != nil {
-				return fmt.Errorf("unable to parse flags: %w", err)
-			}
-
-			// This is a temporary hack to enable proper logging until upstream dependencies
-			// are migrated to fully utilize klog instead of glog.
-			klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
-			klog.InitFlags(klogFlags)
-
-			// Sync the glog and klog flags.
-			cmd.Flags().VisitAll(func(f1 *pflag.Flag) {
-				f2 := klogFlags.Lookup(f1.Name)
-				if f2 != nil {
-					value := f1.Value.String()
-					_ = f2.Value.Set(value)
-				}
-			})
-			return nil
-		},
 		Run: func(cmd *cobra.Command, args []string) {
 			if err := validateShareProtocolSelector(protoSelector); err != nil {
 				klog.Fatalf(err.Error())
@@ -128,8 +101,6 @@ func main() {
 		Version: version.Version,
 	}
 
-	cmd.Flags().AddGoFlagSet(flag.CommandLine)
-
 	cmd.PersistentFlags().StringVar(&endpoint, "endpoint", "unix://tmp/csi.sock", "CSI endpoint")
 
 	cmd.PersistentFlags().StringVar(&driverName, "drivername", "manila.csi.openstack.org", "name of the driver")