osfs: Ensure BoundOS.Chroot returns another BoundOS fs

Signed-off-by: Paulo Gomes <[email protected]>

Author: pjbgf

osfs/os_bound.go

@@ -217,14 +217,14 @@ func (fs *BoundOS) Readlink(link string) (string, error) {
 	return os.Readlink(link)
 }
 
-// Chroot returns a new OS filesystem, with the base dir set to the
+// Chroot returns a new BoundOS filesystem, with the base dir set to the
 // result of joining the provided path with the underlying base dir.
 func (fs *BoundOS) Chroot(path string) (billy.Filesystem, error) {
 	joined, err := securejoin.SecureJoin(fs.baseDir, path)
 	if err != nil {
 		return nil, err
 	}
-	return New(joined), nil
+	return New(joined, WithBoundOS()), nil
 }
 
 // Root returns the current base dir of the billy.Filesystem.

osfs/os_bound_test.go

@@ -285,6 +285,7 @@ func TestChroot(t *testing.T) {
 	g.Expect(err).ToNot(gomega.HaveOccurred())
 	g.Expect(f).ToNot(gomega.BeNil())
 	g.Expect(f.Root()).To(gomega.Equal(filepath.Join(tmp, "test")))
+	g.Expect(f).Should(gomega.BeAssignableToTypeOf(&BoundOS{}))
 }
 
 func TestRoot(t *testing.T) {