Add support for .krmignore file

kyaml/ext/ext.go

@@ -0,0 +1,10 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package ext
+
+// GetIgnoreFileName returns the name for ignore files in
+// packages. It can be overridden by tools using this library.
+var GetIgnoreFileName = func() string {
+	return ".krmignore"
+}

kyaml/go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/go-openapi/spec v0.19.5
 	github.com/go-openapi/strfmt v0.19.5
 	github.com/go-openapi/validate v0.19.8
+	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00
 	github.com/qri-io/starlib v0.4.2-0.20200213133954-ff2e8cd5ef8d
 	github.com/sergi/go-diff v1.1.0
 	github.com/spf13/cobra v1.0.0

kyaml/go.sum

@@ -145,6 +145,8 @@ github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrk
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826/go.mod h1:TaXosZuwdSHYgviHp1DAtfrULt5eUgsSMsZf+YrPgl8=
+github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 h1:n6/2gBQ3RWajuToeY6ZtZTIKv2v7ThUy5KKusIT0yc0=
+github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00/go.mod h1:Pm3mSP3c5uWn86xMLZ5Sa7JB9GsEZySvHYXCTK4E9q4=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/paulmach/orb v0.1.3/go.mod h1:VFlX/8C+IQ1p6FTRRKzKoOPJnvEtA5G0Veuqwbu//Vk=

kyaml/kio/ignorefilesmatcher.go

@@ -0,0 +1,99 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package kio
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/monochromegane/go-gitignore"
+	"sigs.k8s.io/kustomize/kyaml/ext"
+)
+
+// ignoreFilesMatcher handles `.krmignore` files, which allows for ignoring
+// files or folders in a package. The format of this file is a subset of the
+// gitignore format, with recursive patterns (like a/**/c) not supported. If a
+// file or folder matches any of the patterns in the .krmignore file for the
+// package, it will be excluded.
+//
+// It works as follows:
+//
+// * It will look for .krmignore file in the top folder and on the top level
+//   of any subpackages. Subpackages are defined by the presence of a Krmfile
+//   in the folder.
+// * `.krmignore` files only cover files and folders for the package in which
+//   it is defined. So ignore patterns defined in a parent package does not
+//   affect which files are ignored from a subpackage.
+// * An ignore pattern can not ignore a subpackage. So even if the parent
+//   package contains a pattern that ignores the directory foo, if foo is a
+//   subpackage, it will still be included if the IncludeSubpackages property
+//   is set to true
+type ignoreFilesMatcher struct {
+	matchers []matcher
+}
+
+// readIgnoreFile checks whether there is a .krmignore file in the path, and
+// if it is, reads it in and turns it into a matcher. If we can't find a file,
+// we just add a matcher that match nothing.
+func (i *ignoreFilesMatcher) readIgnoreFile(path string) error {
+	m, err := gitignore.NewGitIgnore(filepath.Join(path, ext.GetIgnoreFileName()))
+	if err != nil {
+		if os.IsNotExist(err) {
+			i.matchers = append(i.matchers, matcher{
+				matcher:  gitignore.DummyIgnoreMatcher(false),
+				basePath: path,
+			})
+			return nil
+		}
+		return err
+	}
+	i.matchers = append(i.matchers, matcher{
+		matcher:  m,
+		basePath: path,
+	})
+	return nil
+}
+
+// verifyPath checks whether the top matcher on the stack
+// is correct for the provided filepath. Matchers are removed once
+// we encounter a filepath that is not a subpath of the basepath for
+// the matcher.
+func (i *ignoreFilesMatcher) verifyPath(path string) {
+	for j := len(i.matchers) - 1; j >= 0; j-- {
+		matcher := i.matchers[j]
+		if !strings.HasPrefix(path, matcher.basePath) {
+			i.matchers = i.matchers[:j]
+			return
+		}
+	}
+}
+
+// matchFile checks whether the file given by the provided path matches
+// any of the patterns in the .krmignore file for the package.
+func (i *ignoreFilesMatcher) matchFile(path string) bool {
+	if len(i.matchers) == 0 {
+		return false
+	}
+	i.verifyPath(path)
+	return i.matchers[len(i.matchers)-1].matcher.Match(path, false)
+}
+
+// matchFile checks whether the directory given by the provided path matches
+// any of the patterns in the .krmignore file for the package.
+func (i *ignoreFilesMatcher) matchDir(path string) bool {
+	if len(i.matchers) == 0 {
+		return false
+	}
+	i.verifyPath(path)
+	return i.matchers[len(i.matchers)-1].matcher.Match(path, true)
+}
+
+// matcher wraps the gitignore matcher and the path to the folder
+// where the file was found.
+type matcher struct {
+	matcher gitignore.IgnoreMatcher
+
+	basePath string
+}

kyaml/kio/ignorefilesmatcher_test.go

@@ -0,0 +1,203 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package kio
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIgnoreFilesMatcher_readIgnoreFile(t *testing.T) {
+	testCases := []struct {
+		name            string
+		writeIgnoreFile bool
+		isMatch         bool
+	}{
+		{
+			name:            "has .krmignore file",
+			writeIgnoreFile: true,
+			isMatch:         true,
+		},
+		{
+			name:            "no .krmignore file",
+			writeIgnoreFile: false,
+			isMatch:         false,
+		},
+	}
+
+	for i := range testCases {
+		test := testCases[i]
+		t.Run(test.name, func(t *testing.T) {
+			dir, err := ioutil.TempDir("", "kyaml-test")
+			if !assert.NoError(t, err) {
+				assert.FailNow(t, err.Error())
+			}
+
+			if test.writeIgnoreFile {
+				ignoreFilePath := filepath.Join(dir, ".krmignore")
+				err = ioutil.WriteFile(ignoreFilePath, []byte(`
+testfile.yaml
+`), 0600)
+				if !assert.NoError(t, err) {
+					assert.FailNow(t, err.Error())
+				}
+			}
+			testFilePath := filepath.Join(dir, "testfile.yaml")
+			err = ioutil.WriteFile(testFilePath, []byte{}, 0600)
+			if !assert.NoError(t, err) {
+				assert.FailNow(t, err.Error())
+			}
+
+			ignoreFilesMatcher := ignoreFilesMatcher{}
+			err = ignoreFilesMatcher.readIgnoreFile(dir)
+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}
+			assert.Equal(t, test.isMatch, ignoreFilesMatcher.matchFile(testFilePath))
+		})
+	}
+}
+
+var (
+	readFileA = []byte(`
+a: a
+---
+c: c
+`)
+	readFileB = []byte(`
+b: b
+`)
+)
+
+func TestLocalPackageReader_Read_ignoreFile(t *testing.T) {
+	testCases := []struct {
+		name        string
+		directories []string
+		files       map[string][]byte
+		expected    []string
+	}{
+		{
+			name: "ignore file",
+			directories: []string{
+				filepath.Join("a", "b"),
+				filepath.Join("a", "c"),
+			},
+			files: map[string][]byte{
+				filepath.Join("pkgFile"):               {},
+				filepath.Join("a", "b", "a_test.yaml"): readFileA,
+				filepath.Join("a", "c", "c_test.yaml"): readFileB,
+				filepath.Join(".krmignore"): []byte(`
+a/c/c_test.yaml
+`,
+				),
+			},
+			expected: []string{
+				`a: a`,
+				`c: c`,
+			},
+		},
+		{
+			name: "ignore folder",
+			directories: []string{
+				filepath.Join("a", "b"),
+				filepath.Join("a", "c"),
+			},
+			files: map[string][]byte{
+				filepath.Join("pkgFile"):               {},
+				filepath.Join("a", "b", "a_test.yaml"): readFileA,
+				filepath.Join("a", "c", "c_test.yaml"): readFileB,
+				filepath.Join(".krmignore"): []byte(`
+a/c
+`,
+				),
+			},
+			expected: []string{
+				`a: a`,
+				`c: c`,
+			},
+		},
+		{
+			name: "krmignore file in subpackage",
+			directories: []string{
+				filepath.Join("a", "c"),
+			},
+			files: map[string][]byte{
+				filepath.Join("pkgFile"):               {},
+				filepath.Join("a", "c", "a_test.yaml"): readFileA,
+				filepath.Join("a", "c", "c_test.yaml"): readFileB,
+				filepath.Join(".krmignore"): []byte(`
+d/e/f.yaml
+`,
+				),
+				filepath.Join("a", "c", "pkgFile"): {},
+				filepath.Join("a", "c", ".krmignore"): []byte(`
+a_test.yaml
+`),
+			},
+			expected: []string{
+				`b: b`,
+			},
+		},
+		{
+			name: "krmignore files does not affect subpackages",
+			directories: []string{
+				filepath.Join("a", "c"),
+			},
+			files: map[string][]byte{
+				filepath.Join("pkgFile"):               {},
+				filepath.Join("a", "c", "a_test.yaml"): readFileA,
+				filepath.Join("a", "c", "c_test.yaml"): readFileB,
+				filepath.Join(".krmignore"): []byte(`
+a/c/c_test.yaml
+`,
+				),
+				filepath.Join("a", "c", "pkgFile"): {},
+				filepath.Join("a", "c", ".krmignore"): []byte(`
+a_test.yaml
+`),
+			},
+			expected: []string{
+				`b: b`,
+			},
+		},
+	}
+
+	for i := range testCases {
+		test := testCases[i]
+		t.Run(test.name, func(t *testing.T) {
+			s := SetupDirectories(t, test.directories...)
+			defer s.Clean()
+			for path, content := range test.files {
+				s.WriteFile(t, path, content)
+			}
+
+			// empty path
+			rfr := LocalPackageReader{
+				PackagePath:           s.Root,
+				IncludeSubpackages:    true,
+				PackageFileName:       "pkgFile",
+				OmitReaderAnnotations: true,
+			}
+			nodes, err := rfr.Read()
+			if !assert.NoError(t, err) {
+				assert.FailNow(t, err.Error())
+			}
+
+			if !assert.Len(t, nodes, len(test.expected)) {
+				assert.FailNow(t, "wrong number items")
+			}
+
+			for i, node := range nodes {
+				val, err := node.String()
+				assert.NoError(t, err)
+				want := strings.ReplaceAll(test.expected[i], "${SEP}", string(filepath.Separator))
+				assert.Equal(t, strings.TrimSpace(want), strings.TrimSpace(val))
+			}
+		})
+	}
+}

kyaml/kio/pkgio_reader.go

@@ -184,8 +184,13 @@ func (r LocalPackageReader) Read() ([]*yaml.RNode, error) {
 
 	var operand ResourceNodeSlice
 	var pathRelativeTo string
-	r.PackagePath = filepath.Clean(r.PackagePath)
-	err := filepath.Walk(r.PackagePath, func(
+	var err error
+	ignoreFilesMatcher := &ignoreFilesMatcher{}
+	r.PackagePath, err = filepath.Abs(r.PackagePath)
+	if err != nil {
+		return nil, errors.Wrap(err)
+	}
+	err = filepath.Walk(r.PackagePath, func(
 		path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return errors.Wrap(err)
@@ -194,9 +199,10 @@ func (r LocalPackageReader) Read() ([]*yaml.RNode, error) {
 		// is this the user specified path?
 		if path == r.PackagePath {
 			if info.IsDir() {
-				// skip the root package directory
+				// skip the root package directory, but check for a
+				// .krmignore file first.
 				pathRelativeTo = r.PackagePath
-				return nil
+				return ignoreFilesMatcher.readIgnoreFile(path)
 			}
 
 			// user specified path is a file rather than a directory.
@@ -206,9 +212,9 @@ func (r LocalPackageReader) Read() ([]*yaml.RNode, error) {
 
 		// check if we should skip the directory or file
 		if info.IsDir() {
-			return r.ShouldSkipDir(path)
+			return r.ShouldSkipDir(path, ignoreFilesMatcher)
 		}
-		if match, err := r.ShouldSkipFile(info); err != nil {
+		if match, err := r.ShouldSkipFile(path, ignoreFilesMatcher); err != nil {
 			return err
 		} else if !match {
 			// skip this file
@@ -251,10 +257,15 @@ func (r *LocalPackageReader) readFile(path string, _ os.FileInfo) ([]*yaml.RNode
 }
 
 // ShouldSkipFile returns true if the file should be skipped
-func (r *LocalPackageReader) ShouldSkipFile(info os.FileInfo) (bool, error) {
+func (r *LocalPackageReader) ShouldSkipFile(path string, matcher *ignoreFilesMatcher) (bool, error) {
+	// check if the file is covered by a .krmignore file.
+	if matcher.matchFile(path) {
+		return false, nil
+	}
+
 	// check if the files are in scope
 	for _, g := range r.MatchFilesGlob {
-		if match, err := filepath.Match(g, info.Name()); err != nil {
+		if match, err := filepath.Match(g, filepath.Base(path)); err != nil {
 			return false, errors.Wrap(err)
 		} else if match {
 			return true, nil
@@ -274,13 +285,22 @@ func (r *LocalPackageReader) initReaderAnnotations(path string, _ os.FileInfo) {
 }
 
 // ShouldSkipDir returns a filepath.SkipDir if the directory should be skipped
-func (r *LocalPackageReader) ShouldSkipDir(path string) error {
+func (r *LocalPackageReader) ShouldSkipDir(path string, matcher *ignoreFilesMatcher) error {
 	if r.PackageFileName == "" {
+		// If the folder is not a package, but covered by the .krmignore file,
+		// we skip it.
+		if matcher.matchDir(path) {
+			return filepath.SkipDir
+		}
 		return nil
 	}
 	// check if this is a subpackage
 	_, err := os.Stat(filepath.Join(path, r.PackageFileName))
 	if os.IsNotExist(err) {
+		// Skip the folder if it is covered by the .krmignore file.
+		if matcher.matchDir(path) {
+			return filepath.SkipDir
+		}
 		return nil
 	} else if err != nil {
 		return errors.Wrap(err)
@@ -288,5 +308,9 @@ func (r *LocalPackageReader) ShouldSkipDir(path string) error {
 	if !r.IncludeSubpackages {
 		return filepath.SkipDir
 	}
-	return nil
+	// We don't allow the .krmignore file in a package cause us to skip
+	// a subpackage. So if we have found a package file in the folder and
+	// we should include subpackages, we don't check the .krmignore file. We
+	// do however check whether the package contains a .krmignore file.
+	return matcher.readIgnoreFile(path)
 }

kyaml/kio/pkgio_reader_test.go

@@ -4,59 +4,14 @@
 package kio_test
 
 import (
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	. "sigs.k8s.io/kustomize/kyaml/kio"
-	// "sigs.k8s.io/kustomize/kyaml/testutil"
 )
 
-// setup creates directories and files for testing
-type setup struct {
-	// root is the tmp directory
-	root string
-}
-
-// setupDirectories creates directories for reading test configuration from
-func setupDirectories(t *testing.T, dirs ...string) setup {
-	d, err := ioutil.TempDir("", "kyaml-test")
-	if !assert.NoError(t, err) {
-		assert.FailNow(t, err.Error())
-	}
-	err = os.Chdir(d)
-	if !assert.NoError(t, err) {
-		assert.FailNow(t, err.Error())
-	}
-	for _, s := range dirs {
-		err = os.MkdirAll(s, 0700)
-		if !assert.NoError(t, err) {
-			assert.FailNow(t, err.Error())
-		}
-	}
-	return setup{root: d}
-}
-
-// writeFile writes a file under the test directory
-func (s setup) writeFile(t *testing.T, path string, value []byte) {
-	err := os.MkdirAll(filepath.Dir(filepath.Join(s.root, path)), 0700)
-	if !assert.NoError(t, err) {
-		assert.FailNow(t, err.Error())
-	}
-	err = ioutil.WriteFile(filepath.Join(s.root, path), value, 0600)
-	if !assert.NoError(t, err) {
-		assert.FailNow(t, err.Error())
-	}
-}
-
-// clean deletes the test config
-func (s setup) clean() {
-	os.RemoveAll(s.root)
-}
-
 var readFileA = []byte(`---
 a: b #first
 ---
@@ -94,18 +49,18 @@ func TestLocalPackageReader_Read_empty(t *testing.T) {
 }
 
 func TestLocalPackageReader_Read_pkg(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("b_test.yaml"), readFileB)
-	s.writeFile(t, filepath.Join("c_test.yaml"), readFileC)
-	s.writeFile(t, filepath.Join("d_test.yaml"), readFileD)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("b_test.yaml"), readFileB)
+	s.WriteFile(t, filepath.Join("c_test.yaml"), readFileC)
+	s.WriteFile(t, filepath.Join("d_test.yaml"), readFileD)
 
 	paths := []struct {
 		path string
 	}{
 		{path: "./"},
-		{path: s.root},
+		{path: s.Root},
 	}
 	for _, p := range paths {
 		rfr := LocalPackageReader{PackagePath: p.path}
@@ -167,13 +122,13 @@ metadata:
 }
 
 func TestLocalPackageReader_Read_JSON(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
 
-	s.writeFile(t, filepath.Join("a_test.json"), []byte(`{
+	s.WriteFile(t, filepath.Join("a_test.json"), []byte(`{
   "a": "b"
 }`))
-	s.writeFile(t, filepath.Join("b_test.json"), []byte(`{
+	s.WriteFile(t, filepath.Join("b_test.json"), []byte(`{
   "e": "f",
   "g": {
     "h": ["i", "j"]
@@ -184,7 +139,7 @@ func TestLocalPackageReader_Read_JSON(t *testing.T) {
 		path string
 	}{
 		{path: "./"},
-		{path: s.root},
+		{path: s.Root},
 	}
 	for _, p := range paths {
 		rfr := LocalPackageReader{PackagePath: p.path, MatchFilesGlob: []string{"*.json"}}
@@ -217,16 +172,16 @@ func TestLocalPackageReader_Read_JSON(t *testing.T) {
 }
 
 func TestLocalPackageReader_Read_file(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("b_test.yaml"), readFileB)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("b_test.yaml"), readFileB)
 
 	paths := []struct {
 		path string
 	}{
 		{path: "./"},
-		{path: s.root},
+		{path: s.Root},
 	}
 	for _, p := range paths {
 		rfr := LocalPackageReader{PackagePath: filepath.Join(p.path, "a_test.yaml")}
@@ -265,16 +220,16 @@ metadata:
 }
 
 func TestLocalPackageReader_Read_pkgOmitAnnotations(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("b_test.yaml"), readFileB)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("b_test.yaml"), readFileB)
 
 	paths := []struct {
 		path string
 	}{
 		{path: "./"},
-		{path: s.root},
+		{path: s.Root},
 	}
 	for _, p := range paths {
 		// empty path
@@ -313,16 +268,16 @@ g:
 }
 
 func TestLocalPackageReader_Read_nestedDirs(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("a", "b", "b_test.yaml"), readFileB)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("a", "b", "b_test.yaml"), readFileB)
 
 	paths := []struct {
 		path string
 	}{
 		{path: "./"},
-		{path: s.root},
+		{path: s.Root},
 	}
 	for _, p := range paths {
 		// empty path
@@ -374,13 +329,13 @@ metadata:
 }
 
 func TestLocalPackageReader_Read_matchRegex(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("a", "b", "b_test.yaml"), readFileB)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("a", "b", "b_test.yaml"), readFileB)
 
 	// empty path
-	rfr := LocalPackageReader{PackagePath: s.root, MatchFilesGlob: []string{`a*.yaml`}}
+	rfr := LocalPackageReader{PackagePath: s.Root, MatchFilesGlob: []string{`a*.yaml`}}
 	nodes, err := rfr.Read()
 	if !assert.NoError(t, err) {
 		assert.FailNow(t, err.Error())
@@ -414,14 +369,14 @@ metadata:
 }
 
 func TestLocalPackageReader_Read_skipSubpackage(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("a", "c", "c_test.yaml"), readFileB)
-	s.writeFile(t, filepath.Join("a", "c", "pkgFile"), pkgFile)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("a", "c", "c_test.yaml"), readFileB)
+	s.WriteFile(t, filepath.Join("a", "c", "pkgFile"), pkgFile)
 
 	// empty path
-	rfr := LocalPackageReader{PackagePath: s.root, PackageFileName: "pkgFile"}
+	rfr := LocalPackageReader{PackagePath: s.Root, PackageFileName: "pkgFile"}
 	nodes, err := rfr.Read()
 	if !assert.NoError(t, err) {
 		assert.FailNow(t, err.Error())
@@ -455,14 +410,14 @@ metadata:
 }
 
 func TestLocalPackageReader_Read_includeSubpackage(t *testing.T) {
-	s := setupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
-	defer s.clean()
-	s.writeFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
-	s.writeFile(t, filepath.Join("a", "c", "c_test.yaml"), readFileB)
-	s.writeFile(t, filepath.Join("a", "c", "pkgFile"), pkgFile)
+	s := SetupDirectories(t, filepath.Join("a", "b"), filepath.Join("a", "c"))
+	defer s.Clean()
+	s.WriteFile(t, filepath.Join("a", "b", "a_test.yaml"), readFileA)
+	s.WriteFile(t, filepath.Join("a", "c", "c_test.yaml"), readFileB)
+	s.WriteFile(t, filepath.Join("a", "c", "pkgFile"), pkgFile)
 
 	// empty path
-	rfr := LocalPackageReader{PackagePath: s.root, IncludeSubpackages: true, PackageFileName: "pkgFile"}
+	rfr := LocalPackageReader{PackagePath: s.Root, IncludeSubpackages: true, PackageFileName: "pkgFile"}
 	nodes, err := rfr.Read()
 	if !assert.NoError(t, err) {
 		assert.FailNow(t, err.Error())

kyaml/kio/testing.go

@@ -0,0 +1,55 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package kio
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// Setup creates directories and files for testing
+type Setup struct {
+	// root is the tmp directory
+	Root string
+}
+
+// setupDirectories creates directories for reading test configuration from
+func SetupDirectories(t *testing.T, dirs ...string) Setup {
+	d, err := ioutil.TempDir("", "kyaml-test")
+	if !assert.NoError(t, err) {
+		assert.FailNow(t, err.Error())
+	}
+	err = os.Chdir(d)
+	if !assert.NoError(t, err) {
+		assert.FailNow(t, err.Error())
+	}
+	for _, s := range dirs {
+		err = os.MkdirAll(s, 0700)
+		if !assert.NoError(t, err) {
+			assert.FailNow(t, err.Error())
+		}
+	}
+	return Setup{Root: d}
+}
+
+// writeFile writes a file under the test directory
+func (s Setup) WriteFile(t *testing.T, path string, value []byte) {
+	err := os.MkdirAll(filepath.Dir(filepath.Join(s.Root, path)), 0700)
+	if !assert.NoError(t, err) {
+		assert.FailNow(t, err.Error())
+	}
+	err = ioutil.WriteFile(filepath.Join(s.Root, path), value, 0600)
+	if !assert.NoError(t, err) {
+		assert.FailNow(t, err.Error())
+	}
+}
+
+// clean deletes the test config
+func (s Setup) Clean() {
+	os.RemoveAll(s.Root)
+}