Fix build on non-Linux

Unrelated to the rest of the PR.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

libpod/util_linux.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/containerd/cgroups"
+	"github.com/containers/libpod/pkg/util"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -67,3 +68,26 @@ func assembleSystemdCgroupName(baseSlice, newSlice string) (string, error) {
 
 	return final, nil
 }
+
+// GetV1CGroups gets the V1 cgroup subsystems and then "filters"
+// out any subsystems that are provided by the caller.  Passing nil
+// for excludes will return the subsystems unfiltered.
+//func GetV1CGroups(excludes []string) ([]cgroups.Subsystem, error) {
+func GetV1CGroups(excludes []string) cgroups.Hierarchy {
+	return func() ([]cgroups.Subsystem, error) {
+		var filtered []cgroups.Subsystem
+
+		subSystem, err := cgroups.V1()
+		if err != nil {
+			return nil, err
+		}
+		for _, s := range subSystem {
+			// If the name of the subsystem is not in the list of excludes, then
+			// add it as a keeper.
+			if !util.StringInSlice(string(s.Name()), excludes) {
+				filtered = append(filtered, s)
+			}
+		}
+		return filtered, nil
+	}
+}