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/filesystem_test.go

@@ -0,0 +1,40 @@
+package filesys
+
+import (
+	"os"
+	"testing"
+
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/assert"
+)
+
+var filesysBuilders = map[string]func() FileSystem{
+	"MakeFsInMemory":       MakeFsInMemory,
+	"MakeFsOnDisk":         MakeFsOnDisk,
+	"MakeEmptyDirInMemory": func() FileSystem { return MakeEmptyDirInMemory() },
+}
+
+func TestNotExistErr(t *testing.T) {
+	for name, builder := range filesysBuilders {
+		t.Run(name, func(t *testing.T) {
+			testNotExistErr(t, builder())
+		})
+	}
+}
+
+func testNotExistErr(t *testing.T, fs FileSystem) {
+	const path = "bad-dir/file.txt"
+
+	err := fs.RemoveAll(path)
+	assert.Falsef(t, errors.Is(err, os.ErrNotExist), "RemoveAll should not return ErrNotExist, got %v", err)
+	_, err = fs.Open(path)
+	assert.Truef(t, errors.Is(err, os.ErrNotExist), "Open should return ErrNotExist, got %v", err)
+	_, err = fs.ReadDir(path)
+	assert.Truef(t, errors.Is(err, os.ErrNotExist), "ReadDir should return ErrNotExist, got %v", err)
+	_, _, err = fs.CleanedAbs(path)
+	assert.Truef(t, errors.Is(err, os.ErrNotExist), "CleanedAbs should return ErrNotExist, got %v", err)
+	_, err = fs.ReadFile(path)
+	assert.Truef(t, errors.Is(err, os.ErrNotExist), "ReadFile should return ErrNotExist, got %v", err)
+	err = fs.Walk(path, func(_ string, _ os.FileInfo, err error) error { return err })
+	assert.Truef(t, errors.Is(err, os.ErrNotExist), "Walk should return ErrNotExist, got %v", err)
+}