Merge pull request #4720 from kolyshkin/1.2-4709

[1.2] runc pause/unpause/ps: get rid of excessive warning

pause.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 )
 
@@ -19,18 +18,16 @@ Use runc list to identify instances of containers and their current status.`,
 		if err := checkArgs(context, 1, exactArgs); err != nil {
 			return err
 		}
-		rootlessCg, err := shouldUseRootlessCgroupManager(context)
-		if err != nil {
-			return err
-		}
-		if rootlessCg {
-			logrus.Warnf("runc pause may fail if you don't have the full access to cgroups")
-		}
 		container, err := getContainer(context)
 		if err != nil {
 			return err
 		}
-		return container.Pause()
+		err = container.Pause()
+		if err != nil {
+			maybeLogCgroupWarning("pause", err)
+			return err
+		}
+		return nil
 	},
 }
 
@@ -48,17 +45,15 @@ Use runc list to identify instances of containers and their current status.`,
 		if err := checkArgs(context, 1, exactArgs); err != nil {
 			return err
 		}
-		rootlessCg, err := shouldUseRootlessCgroupManager(context)
-		if err != nil {
-			return err
-		}
-		if rootlessCg {
-			logrus.Warn("runc resume may fail if you don't have the full access to cgroups")
-		}
 		container, err := getContainer(context)
 		if err != nil {
 			return err
 		}
-		return container.Resume()
+		err = container.Resume()
+		if err != nil {
+			maybeLogCgroupWarning("resume", err)
+			return err
+		}
+		return nil
 	},
 }

ps.go

@@ -9,7 +9,6 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 )
 
@@ -28,13 +27,6 @@ var psCommand = cli.Command{
 		if err := checkArgs(context, 1, minArgs); err != nil {
 			return err
 		}
-		rootlessCg, err := shouldUseRootlessCgroupManager(context)
-		if err != nil {
-			return err
-		}
-		if rootlessCg {
-			logrus.Warn("runc ps may fail if you don't have the full access to cgroups")
-		}
 
 		container, err := getContainer(context)
 		if err != nil {
@@ -43,6 +35,7 @@ var psCommand = cli.Command{
 
 		pids, err := container.Processes()
 		if err != nil {
+			maybeLogCgroupWarning("ps", err)
 			return err
 		}
 

utils_linux.go

@@ -3,6 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io/fs"
 	"net"
 	"os"
 	"path/filepath"
@@ -444,3 +445,9 @@ func setupPidfdSocket(process *libcontainer.Process, sockpath string) (_clean fu
 		conn.Close()
 	}, nil
 }
+
+func maybeLogCgroupWarning(op string, err error) {
+	if errors.Is(err, fs.ErrPermission) {
+		logrus.Warn("runc " + op + " failure might be caused by lack of full access to cgroups")
+	}
+}