Move api/filesys to kyaml/filesys (#3997)

* Move api/filesys to kyaml/filesys

* Add deprecated version of api/filesys with aliases to new code

* Use new kyaml/filesys package and update dependencies

* Migrate to kyaml/filesys and update dependencies

* Skip tests that break on Windows

kyaml/filesys/confirmeddir_test.go

@@ -0,0 +1,111 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// +build !windows
+
+package filesys
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestJoin(t *testing.T) {
+	fSys := MakeFsInMemory()
+	err := fSys.Mkdir("/foo")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	d, f, err := fSys.CleanedAbs("/foo")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if f != "" {
+		t.Fatalf("unexpected file: %v", f)
+	}
+	if d.Join("bar") != "/foo/bar" {
+		t.Fatalf("expected join %s", d.Join("bar"))
+	}
+}
+
+func TestHasPrefix_Slash(t *testing.T) {
+	fSys := MakeFsInMemory()
+	d, f, err := fSys.CleanedAbs("/")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if f != "" {
+		t.Fatalf("unexpected file: %v", f)
+	}
+	if d.HasPrefix("/hey") {
+		t.Fatalf("should be false")
+	}
+	if !d.HasPrefix("/") {
+		t.Fatalf("/ should have the prefix /")
+	}
+}
+
+func TestHasPrefix_SlashFoo(t *testing.T) {
+	fSys := MakeFsInMemory()
+	err := fSys.Mkdir("/foo")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	d, _, err := fSys.CleanedAbs("/foo")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if d.HasPrefix("/fo") {
+		t.Fatalf("/foo does not have path prefix /fo")
+	}
+	if d.HasPrefix("/fod") {
+		t.Fatalf("/foo does not have path prefix /fod")
+	}
+	if !d.HasPrefix("/foo") {
+		t.Fatalf("/foo should have prefix /foo")
+	}
+}
+
+func TestHasPrefix_SlashFooBar(t *testing.T) {
+	fSys := MakeFsInMemory()
+	err := fSys.MkdirAll("/foo/bar")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	d, _, err := fSys.CleanedAbs("/foo/bar")
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if d.HasPrefix("/fo") {
+		t.Fatalf("/foo/bar does not have path prefix /fo")
+	}
+	if d.HasPrefix("/foobar") {
+		t.Fatalf("/foo/bar does not have path prefix /foobar")
+	}
+	if !d.HasPrefix("/foo/bar") {
+		t.Fatalf("/foo/bar should have prefix /foo/bar")
+	}
+	if !d.HasPrefix("/foo") {
+		t.Fatalf("/foo/bar should have prefix /foo")
+	}
+	if !d.HasPrefix("/") {
+		t.Fatalf("/foo/bar should have prefix /")
+	}
+}
+
+func TestNewTempConfirmDir(t *testing.T) {
+	tmp, err := NewTmpConfirmedDir()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	defer os.RemoveAll(string(tmp))
+
+	delinked, err := filepath.EvalSymlinks(string(tmp))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if string(tmp) != delinked {
+		t.Fatalf("unexpected path containing symlinks")
+	}
+}