libpod: Add volume support for FreeBSD

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

libpod/util_freebsd.go

@@ -0,0 +1,36 @@
+//go:build freebsd
+// +build freebsd
+
+package libpod
+
+import (
+	"errors"
+	"syscall"
+
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/sys/unix"
+)
+
+// systemdSliceFromPath makes a new systemd slice under the given parent with
+// the given name.
+// The parent must be a slice. The name must NOT include ".slice"
+func systemdSliceFromPath(parent, name string, resources *spec.LinuxResources) (string, error) {
+	return "", errors.New("not implemented systemdSliceFromPath")
+}
+
+// No equivalent on FreeBSD?
+func LabelVolumePath(path string) error {
+	return nil
+}
+
+// Unmount umounts a target directory
+func Unmount(mount string) {
+	if err := unix.Unmount(mount, unix.MNT_FORCE); err != nil {
+		if err != syscall.EINVAL {
+			logrus.Warnf("Failed to unmount %s : %v", mount, err)
+		} else {
+			logrus.Debugf("failed to unmount %s : %v", mount, err)
+		}
+	}
+}