Move mount to core/mount

Signed-off-by: Derek McGowan <derek@mcg.dev>

core/mount/mount_unsupported.go

@@ -0,0 +1,46 @@
+//go:build darwin || openbsd
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package mount
+
+import "errors"
+
+var (
+	// ErrNotImplementOnUnix is returned for methods that are not implemented
+	ErrNotImplementOnUnix = errors.New("not implemented under unix")
+)
+
+// Mount is not implemented on this platform
+func (m *Mount) mount(target string) error {
+	return ErrNotImplementOnUnix
+}
+
+// Unmount is not implemented on this platform
+func Unmount(mount string, flags int) error {
+	return ErrNotImplementOnUnix
+}
+
+// UnmountAll is not implemented on this platform
+func UnmountAll(mount string, flags int) error {
+	return ErrNotImplementOnUnix
+}
+
+// UnmountRecursive is not implemented on this platform
+func UnmountRecursive(mount string, flags int) error {
+	return ErrNotImplementOnUnix
+}