criu: return error when checking for min version

libpod/container_internal_common.go

@@ -1135,8 +1135,8 @@ func (c *Container) exportCheckpoint(options ContainerCheckpointOptions) error {
 }
 
 func (c *Container) checkpointRestoreSupported(version int) error {
-	if !criu.CheckForCriu(version) {
-		return fmt.Errorf("checkpoint/restore requires at least CRIU %d", version)
+	if err := criu.CheckForCriu(version); err != nil {
+		return err
 	}
 	if !c.ociRuntime.SupportsCheckpoint() {
 		return errors.New("configured runtime does not support checkpoint/restore")

pkg/checkpoint/checkpoint_restore.go

@@ -93,8 +93,8 @@ func CRImportCheckpoint(ctx context.Context, runtime *libpod.Runtime, restoreOpt
 
 	if restoreOptions.Pod != "" {
 		// Restoring into a Pod requires much newer versions of CRIU
-		if !criu.CheckForCriu(criu.PodCriuVersion) {
-			return nil, fmt.Errorf("restoring containers into pods requires at least CRIU %d", criu.PodCriuVersion)
+		if err := criu.CheckForCriu(criu.PodCriuVersion); err != nil {
+			return nil, fmt.Errorf("restoring containers into pod: %w", err)
 		}
 		// The runtime also has to support it
 		if !crutils.CRRuntimeSupportsPodCheckpointRestore(runtime.GetOCIRuntimePath()) {

pkg/criu/criu_linux.go

@@ -4,6 +4,8 @@
 package criu
 
 import (
+	"fmt"
+
 	"github.com/checkpoint-restore/go-criu/v6"
 	"github.com/checkpoint-restore/go-criu/v6/rpc"
 
@@ -12,13 +14,17 @@ import (
 
 // CheckForCriu uses CRIU's go bindings to check if the CRIU
 // binary exists and if it at least the version Podman needs.
-func CheckForCriu(version int) bool {
+func CheckForCriu(version int) error {
 	c := criu.MakeCriu()
-	result, err := c.IsCriuAtLeast(version)
+	criuVersion, err := c.GetCriuVersion()
 	if err != nil {
-		return false
+		return fmt.Errorf("failed to check for criu version: %w", err)
+	}
+
+	if criuVersion >= version {
+		return nil
 	}
-	return result
+	return fmt.Errorf("checkpoint/restore requires at least CRIU %d, current version is %d", version, criuVersion)
 }
 
 func MemTrack() bool {

pkg/criu/criu_unsupported.go

@@ -3,8 +3,10 @@
 
 package criu
 
-func CheckForCriu(version int) bool {
-	return false
+import "fmt"
+
+func CheckForCriu(version int) error {
+	return fmt.Errorf("CheckForCriu not supported on this platform")
 }
 
 func MemTrack() bool {

test/e2e/checkpoint_image_test.go

@@ -1,6 +1,7 @@
 package integration
 
 import (
+	"fmt"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -27,8 +28,8 @@ var _ = Describe("Podman checkpoint", func() {
 			Skip("OCI runtime does not support checkpoint/restore")
 		}
 
-		if !criu.CheckForCriu(criu.MinCriuVersion) {
-			Skip("CRIU is missing or too old.")
+		if err := criu.CheckForCriu(criu.MinCriuVersion); err != nil {
+			Skip(fmt.Sprintf("check CRIU version error: %v", err))
 		}
 	})
 

test/e2e/checkpoint_test.go

@@ -43,8 +43,8 @@ var _ = Describe("Podman checkpoint", func() {
 			Skip("OCI runtime does not support checkpoint/restore")
 		}
 
-		if !criu.CheckForCriu(criu.MinCriuVersion) {
-			Skip("CRIU is missing or too old.")
+		if err := criu.CheckForCriu(criu.MinCriuVersion); err != nil {
+			Skip(fmt.Sprintf("check CRIU version error: %v", err))
 		}
 		// Only Fedora 29 and newer has a new enough selinux-policy and
 		// container-selinux package to support CRIU in correctly
@@ -1121,8 +1121,8 @@ var _ = Describe("Podman checkpoint", func() {
 		share := share // copy into local scope, for use inside function
 
 		It(testName, func() {
-			if !criu.CheckForCriu(criu.PodCriuVersion) {
-				Skip("CRIU is missing or too old.")
+			if err := criu.CheckForCriu(criu.PodCriuVersion); err != nil {
+				Skip(fmt.Sprintf("check CRIU pod version error: %v", err))
 			}
 			if !crutils.CRRuntimeSupportsPodCheckpointRestore(podmanTest.OCIRuntime) {
 				Skip("runtime does not support pod restore: " + podmanTest.OCIRuntime)