3 files changed, 25 insertions, 6 deletions
diff --git a/pkg/util/mountOpts.go b/pkg/util/mountOpts.go
index b3a38f286..f13dc94ec 100644
--- a/pkg/util/mountOpts.go
+++ b/pkg/util/mountOpts.go
@@ -25,7 +25,7 @@ type defaultMountOptions struct {
 // The sourcePath variable, if not empty, contains a bind mount source.
 func ProcessOptions(options []string, isTmpfs bool, sourcePath string) ([]string, error) {
 	var (
-		foundWrite, foundSize, foundProp, foundMode, foundExec, foundSuid, foundDev, foundCopyUp, foundBind, foundZ bool
+		foundWrite, foundSize, foundProp, foundMode, foundExec, foundSuid, foundDev, foundCopyUp, foundBind, foundZ, foundU bool
 	)
 
 	newOptions := make([]string, 0, len(options))
@@ -116,6 +116,11 @@ func ProcessOptions(options []string, isTmpfs bool, sourcePath string) ([]string
 				return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'z' and 'Z' can be used")
 			}
 			foundZ = true
+		case "U":
+			if foundU {
+				return nil, errors.Wrapf(ErrDupeMntOption, "the 'U' option can only be set once")
+			}
+			foundU = true
 		default:
 			return nil, errors.Wrapf(ErrBadMntOption, "unknown mount option %q", opt)
 		}
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 32bb66332..a4c8f3a64 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -16,13 +16,14 @@ import (
 	"github.com/BurntSushi/toml"
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/image/v5/types"
-	"github.com/containers/podman/v2/pkg/errorhandling"
-	"github.com/containers/podman/v2/pkg/namespaces"
-	"github.com/containers/podman/v2/pkg/rootless"
-	"github.com/containers/podman/v2/pkg/signal"
+	"github.com/containers/podman/v3/pkg/errorhandling"
+	"github.com/containers/podman/v3/pkg/namespaces"
+	"github.com/containers/podman/v3/pkg/rootless"
+	"github.com/containers/podman/v3/pkg/signal"
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/idtools"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/crypto/ssh/terminal"
@@ -692,3 +693,16 @@ func CoresToPeriodAndQuota(cores float64) (uint64, int64) {
 func PeriodAndQuotaToCores(period uint64, quota int64) float64 {
 	return float64(quota) / float64(period)
 }
+
+// IDtoolsToRuntimeSpec converts idtools ID mapping to the one of the runtime spec.
+func IDtoolsToRuntimeSpec(idMaps []idtools.IDMap) (convertedIDMap []specs.LinuxIDMapping) {
+	for _, idmap := range idMaps {
+		tempIDMap := specs.LinuxIDMapping{
+			ContainerID: uint32(idmap.ContainerID),
+			HostID:      uint32(idmap.HostID),
+			Size:        uint32(idmap.Size),
+		}
+		convertedIDMap = append(convertedIDMap, tempIDMap)
+	}
+	return convertedIDMap
+}
diff --git a/pkg/util/utils_supported.go b/pkg/util/utils_supported.go
index 21022eb7c..cb992d8b6 100644
--- a/pkg/util/utils_supported.go
+++ b/pkg/util/utils_supported.go
@@ -11,7 +11,7 @@ import (
 	"path/filepath"
 	"syscall"
 
-	"github.com/containers/podman/v2/pkg/rootless"
+	"github.com/containers/podman/v3/pkg/rootless"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )