feat(go): support license scanning in both GOPATH and vendor (#8843)

Co-authored-by: DmitriyLewen <91113035+DmitriyLewen@users.noreply.github.com>

pkg/fanal/analyzer/language/golang/mod/mod.go

@@ -1,6 +1,7 @@
 package mod
 
 import (
+	"cmp"
 	"context"
 	"errors"
 	"fmt"
@@ -138,74 +139,45 @@ func (a *gomodAnalyzer) Version() int {
 
 // fillAdditionalData collects licenses and dependency relationships, then update applications.
 func (a *gomodAnalyzer) fillAdditionalData(fsys fs.FS, apps []types.Application) error {
-	gopath := os.Getenv("GOPATH")
-	if gopath == "" {
-		gopath = build.Default.GOPATH
-	}
+	var modSearchDirs []searchDir
 
 	// $GOPATH/pkg/mod
-	modPath := filepath.Join(gopath, "pkg", "mod")
-	gopathModDirFound := fsutils.DirExists(modPath)
+	if gopath, err := newGOPATH(); err != nil {
+		a.logger.Debug("GOPATH not found. Run 'go mod download' or 'go mod tidy' for identifying dependency graph and licenses", log.Err(err))
+	} else {
+		modSearchDirs = append(modSearchDirs, gopath)
+	}
 
 	licenses := make(map[string][]string)
 	for i, app := range apps {
+		licenseSearchDirs := modSearchDirs
+
+		// vendor directory next to go.mod
+		if vendorDir, err := newVendorDir(fsys, app.FilePath); err == nil {
+			licenseSearchDirs = append(licenseSearchDirs, vendorDir)
+		}
+
 		// Actually used dependencies
 		usedPkgs := lo.SliceToMap(app.Packages, func(pkg types.Package) (string, types.Package) {
 			return pkg.Name, pkg
 		})
 
-		// vendor directory is in the same directory as go.mod
-		vendorDir := filepath.Join(filepath.Dir(app.FilePath), "vendor")
-
-		// Check if the vendor directory exists and is not empty
-		entries, err := fs.ReadDir(fsys, vendorDir)
-		vendorDirFound := err == nil && len(entries) > 0
-		if vendorDirFound {
-			a.logger.Debug("Vendor directory found", log.String("path", vendorDir))
-			modPath = vendorDir
+		// Check if either $GOPATH/pkg/mod or the vendor directory exists
+		if len(licenseSearchDirs) == 0 {
+			continue
 		}
 
-		if !gopathModDirFound && !vendorDirFound {
-			a.logger.Debug("GOPATH and vendor directory not found. Need 'go mod download' or 'go mod vendor' for license scanning",
-				log.String("GOPATH", modPath))
-			return nil
-		}
-
-		for j, lib := range app.Packages {
-			if l, ok := licenses[lib.ID]; ok {
-				// Fill licenses
-				apps[i].Packages[j].Licenses = l
-				continue
-			}
-
-			// Package dir from `vendor` dir doesn't have version suffix.
-			modDirName := normalizeModName(lib.Name)
-			if !vendorDirFound {
-				// Add version suffix for packages from $GOPATH
-				// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v1.0.0
-				modDirName = fmt.Sprintf("%s@%s", modDirName, lib.Version)
-			}
-			modDir := filepath.Join(modPath, modDirName)
-
+		for j, pkg := range app.Packages {
 			// Collect licenses
-			if licenseNames, err := findLicense(fsys, vendorDirFound, modDir, a.licenseClassifierConfidenceLevel); err != nil {
+			if licenseNames, err := findLicense(licenseSearchDirs, pkg, licenses, a.licenseClassifierConfidenceLevel); err != nil {
 				return xerrors.Errorf("unable to collect license: %w", err)
 			} else {
-				// Cache the detected licenses
-				licenses[lib.ID] = licenseNames
-
 				// Fill licenses
 				apps[i].Packages[j].Licenses = licenseNames
 			}
 
-			// `vendor` dir doesn't contain `go.mod` file
-			// cf. https://github.com/aquasecurity/trivy/issues/8527#issuecomment-2777848027
-			if !gopathModDirFound {
-				continue
-			}
-
 			// Collect dependencies of the direct dependency from $GOPATH/pkg/mod because the vendor directory doesn't have go.mod files.
-			dep, err := a.collectDeps(modDir, lib.ID)
+			dep, err := a.collectDeps(modSearchDirs, pkg)
 			if err != nil {
 				return xerrors.Errorf("dependency graph error: %w", err)
 			} else if dep.ID == "" {
@@ -225,23 +197,49 @@ func (a *gomodAnalyzer) fillAdditionalData(fsys fs.FS, apps []types.Application)
 	return nil
 }
 
-func (a *gomodAnalyzer) collectDeps(modDir, pkgID string) (types.Dependency, error) {
-	// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v0.0.0-20220406074731-71021a481237/go.mod
-	modPath := filepath.Join(modDir, "go.mod")
-	f, err := os.Open(modPath)
-	if errors.Is(err, fs.ErrNotExist) {
-		a.logger.Debug("Unable to identify dependencies as it doesn't support Go modules",
-			log.String("module", pkgID))
-		return types.Dependency{}, nil
-	} else if err != nil {
-		return types.Dependency{}, xerrors.Errorf("file open error: %w", err)
+func (a *gomodAnalyzer) collectDeps(searchDirs []searchDir, pkg types.Package) (types.Dependency, error) {
+	for _, searchDir := range searchDirs {
+		// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v0.1.0
+		modDir, err := searchDir.Resolve(pkg)
+		if err != nil {
+			continue
+		}
+
+		dependsOn, err := a.resolveDeps(modDir)
+		if errors.Is(err, fs.ErrNotExist) {
+			a.logger.Debug("Unable to identify dependencies as it doesn't support Go modules",
+				log.String("module", pkg.ID))
+			return types.Dependency{}, nil
+		} else if err != nil {
+			return types.Dependency{}, xerrors.Errorf("resolve deps error: %w", err)
+		}
+
+		return types.Dependency{
+			ID:        pkg.ID,
+			DependsOn: dependsOn,
+		}, nil
+	}
+	return types.Dependency{}, nil
+}
+
+// resolveDeps parses go.mod under $GOPATH/pkg/mod and returns the dependencies
+func (a *gomodAnalyzer) resolveDeps(modDir fs.FS) ([]string, error) {
+	// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v0.1.0/go.mod
+	f, err := modDir.Open("go.mod")
+	if err != nil {
+		return nil, xerrors.Errorf("file open error: %w", err)
 	}
 	defer f.Close()
 
+	file, ok := f.(xio.ReadSeekCloserAt)
+	if !ok {
+		return nil, xerrors.Errorf("type assertion error: %w", err)
+	}
+
 	// Parse go.mod under $GOPATH/pkg/mod
-	pkgs, _, err := a.leafModParser.Parse(f)
+	pkgs, _, err := a.leafModParser.Parse(file)
 	if err != nil {
-		return types.Dependency{}, xerrors.Errorf("%s parse error: %w", modPath, err)
+		return nil, xerrors.Errorf("parse error: %w", err)
 	}
 
 	// Filter out indirect dependencies
@@ -249,10 +247,8 @@ func (a *gomodAnalyzer) collectDeps(modDir, pkgID string) (types.Dependency, err
 		return lib.Name, lib.Relationship == types.RelationshipDirect
 	})
 
-	return types.Dependency{
-		ID:        pkgID,
-		DependsOn: dependsOn,
-	}, nil
+	return dependsOn, nil
+
 }
 
 // addOrphanIndirectDepsUnderRoot handles indirect dependencies that have no identifiable parent packages in the dependency tree.
@@ -341,66 +337,60 @@ func mergeGoSum(gomod, gosum *types.Application) {
 	gomod.Packages = lo.Values(uniq)
 }
 
-func findLicense(fsys fs.FS, vendorDirFound bool, dir string, classifierConfidenceLevel float64) ([]string, error) {
-	var license *types.LicenseFile
-
-	open := func(fsys fs.FS, path string) (fs.File, error) {
-		if vendorDirFound {
-			return fsys.Open(path)
-		}
-		return os.Open(path)
+func findLicense(searchDirs []searchDir, pkg types.Package, licenses map[string][]string, classifierConfidenceLevel float64) ([]string, error) {
+	if licenses[pkg.ID] != nil {
+		return licenses[pkg.ID], nil
 	}
 
-	walkDirFunc := func(path string, d fs.DirEntry, err error) error {
+	var license *types.LicenseFile
+	for _, searchDir := range searchDirs {
+		sub, err := searchDir.Resolve(pkg)
 		if err != nil {
-			return err
-		} else if !d.Type().IsRegular() {
-			return nil
+			continue
 		}
 
-		// For `vendor`, the `fsys` directory contains only license files, so we don't need to check the file name again.
-		if !vendorDirFound {
-			if !licenseRegexp.MatchString(filepath.Base(path)) {
+		err = fs.WalkDir(sub, ".", func(path string, d fs.DirEntry, err error) error {
+			switch {
+			case err != nil:
+				return err
+			case !d.Type().IsRegular():
+				return nil
+			case !licenseRegexp.MatchString(filepath.Base(path)):
 				return nil
 			}
+
+			// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v0.1.0/LICENSE
+			f, err := sub.Open(path)
+			if err != nil {
+				return xerrors.Errorf("file (%s) open error: %w", path, err)
+			}
+			defer f.Close()
+
+			if l, err := licensing.Classify(path, f, classifierConfidenceLevel); err != nil {
+				return xerrors.Errorf("license classify error: %w", err)
+			} else if l != nil && len(l.Findings) > 0 { // License found
+				license = l
+				return fs.SkipAll // Stop walking
+			}
+			return nil
+		})
+
+		switch {
+		// The module path may not exist
+		case errors.Is(err, os.ErrNotExist):
+			continue
+		case err != nil && !errors.Is(err, io.EOF):
+			return nil, xerrors.Errorf("unable to find a known open source license: %w", err)
+		case license == nil || len(license.Findings) == 0:
+			continue
 		}
 
-		// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v0.0.0-20220406074731-71021a481237/LICENSE
-		f, err := open(fsys, path)
-		if err != nil {
-			return xerrors.Errorf("file (%s) open error: %w", path, err)
-		}
-		defer f.Close()
-
-		l, err := licensing.Classify(path, f, classifierConfidenceLevel)
-		if err != nil {
-			return xerrors.Errorf("license classify error: %w", err)
-		}
 		// License found
-		if l != nil && len(l.Findings) > 0 {
-			license = l
-		}
-		return nil
+		licenseNames := license.Findings.Names()
+		licenses[pkg.ID] = licenseNames
+		return licenseNames, nil
 	}
-
-	var err error
-	if vendorDirFound {
-		err = fs.WalkDir(fsys, dir, walkDirFunc)
-	} else {
-		err = filepath.WalkDir(dir, walkDirFunc)
-	}
-
-	switch {
-	// The module path may not exist
-	case errors.Is(err, os.ErrNotExist):
-		return nil, nil
-	case err != nil && !errors.Is(err, io.EOF):
-		return nil, fmt.Errorf("finding a known open source license: %w", err)
-	case license == nil || len(license.Findings) == 0:
-		return nil, nil
-	}
-
-	return license.Findings.Names(), nil
+	return nil, nil
 }
 
 // normalizeModName escapes upper characters
@@ -417,3 +407,58 @@ func normalizeModName(name string) string {
 	}
 	return string(newName)
 }
+
+type searchDir interface {
+	Resolve(pkg types.Package) (fs.FS, error)
+}
+
+type gopathDir struct {
+	root string
+}
+
+func newGOPATH() (searchDir, error) {
+	gopath := cmp.Or(os.Getenv("GOPATH"), build.Default.GOPATH)
+
+	// $GOPATH/pkg/mod
+	modPath := filepath.Join(gopath, "pkg", "mod")
+	if !fsutils.DirExists(modPath) {
+		return nil, xerrors.Errorf("GOPATH not found: %s", modPath)
+	}
+	return &gopathDir{root: modPath}, nil
+}
+
+// Resolve resolves the module directory for a given package.
+// It adds the version suffix to the module name and returns the directory as an fs.FS.
+// e.g. $GOPATH/pkg/mod => $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v1.0.0
+func (d *gopathDir) Resolve(pkg types.Package) (fs.FS, error) {
+	name := normalizeModName(pkg.Name)
+
+	// Add version suffix for packages from $GOPATH
+	// e.g. github.com/aquasecurity/go-dep-parser@v1.0.0
+	modDirName := fmt.Sprintf("%s@%s", name, pkg.Version)
+
+	// e.g. $GOPATH/pkg/mod/github.com/aquasecurity/go-dep-parser@v1.0.0
+	modDir := filepath.Join(d.root, modDirName)
+	return os.DirFS(modDir), nil
+}
+
+type vendorDir struct {
+	root fs.FS
+}
+
+func newVendorDir(fsys fs.FS, modPath string) (vendorDir, error) {
+	// vendor directory is in the same directory as go.mod
+	vendor := filepath.Join(filepath.Dir(modPath), "vendor")
+	sub, err := fs.Sub(fsys, vendor)
+	if err != nil {
+		return vendorDir{}, xerrors.Errorf("vendor directory not found: %w", err)
+	}
+	return vendorDir{root: sub}, nil
+}
+
+// Resolve resolves the module directory for a given package.
+// It doesn't add the version suffix to the module name.
+// e.g. vendor/ => vendor/github.com/aquasecurity/go-dep-parser
+func (d vendorDir) Resolve(pkg types.Package) (fs.FS, error) {
+	return fs.Sub(d.root, normalizeModName(pkg.Name))
+}

pkg/fanal/analyzer/language/golang/mod/mod_test.go

@@ -285,9 +285,10 @@ func Test_gomodAnalyzer_Analyze(t *testing.T) {
 			want: &analyzer.AnalysisResult{},
 		},
 		{
-			name: "vendor dir exists",
+			name: "deps from GOPATH and license from vendor dir",
 			files: []string{
 				"testdata/vendor-dir-exists/mod",
+				"testdata/vendor-dir-exists/vendor",
 			},
 			want: &analyzer.AnalysisResult{
 				Applications: []types.Application{
@@ -300,7 +301,7 @@ func Test_gomodAnalyzer_Analyze(t *testing.T) {
 								Name:         "github.com/org/repo",
 								Relationship: types.RelationshipRoot,
 								DependsOn: []string{
-									"github.com/aquasecurity/go-dep-parser@v0.0.0-20220406074731-71021a481237",
+									"github.com/aquasecurity/go-dep-parser@v0.0.1",
 								},
 								ExternalReferences: []types.ExternalRef{
 									{
@@ -310,11 +311,11 @@ func Test_gomodAnalyzer_Analyze(t *testing.T) {
 								},
 							},
 							{
-								ID:           "github.com/aquasecurity/go-dep-parser@v0.0.0-20220406074731-71021a481237",
+								ID:           "github.com/aquasecurity/go-dep-parser@v0.0.1",
 								Name:         "github.com/aquasecurity/go-dep-parser",
-								Version:      "v0.0.0-20220406074731-71021a481237",
+								Version:      "v0.0.1",
 								Relationship: types.RelationshipDirect,
-								Licenses:     []string{"MIT"},
+								Licenses:     []string{"Apache-2.0"},
 								ExternalReferences: []types.ExternalRef{
 									{
 										Type: types.RefVCS,
@@ -347,10 +348,13 @@ func Test_gomodAnalyzer_Analyze(t *testing.T) {
 			mfs := mapfs.New()
 			for _, file := range tt.files {
 				// Since broken go.mod files bothers IDE, we should use other file names than "go.mod" and "go.sum".
-				if filepath.Base(file) == "mod" {
+				switch filepath.Base(file) {
+				case "mod":
 					require.NoError(t, mfs.WriteFile("go.mod", file))
-				} else if filepath.Base(file) == "sum" {
+				case "sum":
 					require.NoError(t, mfs.WriteFile("go.sum", file))
+				case "vendor":
+					require.NoError(t, mfs.CopyDir(file, "."))
 				}
 			}
 

pkg/fanal/analyzer/language/golang/mod/testdata/pkg/mod/github.com/aquasecurity/go-dep-parser@v0.0.1/go.mod

@@ -0,0 +1,7 @@
+module github.com/aquasecurity/go-dep-parser
+
+go 1.18
+
+require (
+	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2
+)

pkg/fanal/analyzer/language/golang/mod/testdata/vendor-dir-exists/mod

@@ -2,8 +2,6 @@ module github.com/org/repo
 
 go 1.17
 
-require github.com/aquasecurity/go-dep-parser v0.0.0-20211110174639-8257534ffed3
+require github.com/aquasecurity/go-dep-parser v0.0.1
 
-require golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-
-replace github.com/aquasecurity/go-dep-parser => github.com/aquasecurity/go-dep-parser v0.0.0-20220406074731-71021a481237
+require golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect

pkg/fanal/analyzer/language/golang/mod/testdata/vendor-dir-exists/vendor/github.com/aquasecurity/go-dep-parser/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.

pkg/fanal/analyzer/language/golang/mod/testdata/vendor-dir-exists/vendor/go-dep-parser/LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2019 Teppei Fukuda
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

pkg/mapfs/fs.go

@@ -110,6 +110,42 @@ func (m *FS) FilterFunc(fn func(path string, d fs.DirEntry) (bool, error)) (*FS,
 	return newFS, nil
 }
 
+// CopyDir copies a directory from the local filesystem into the in-memory filesystem.
+// This function works similarly to the Unix command "cp -r src dst", recursively copying
+// the entire directory structure from the source to the destination.
+//
+// The function:
+// 1. Walks through all files and subdirectories in the source directory
+// 2. Recreates the directory structure in the in-memory filesystem
+// 3. Copies all files while preserving their relative paths
+//
+// Parameters:
+//   - src: The source directory path in the local filesystem
+//   - dst: The destination directory path in the in-memory filesystem
+//
+// For example, if src is "/tmp/data" and dst is "app/", then:
+// - A file at "/tmp/data/settings.json" will be copied to "app/data/settings.json"
+// - A file at "/tmp/data/subdir/config.yaml" will be copied to "app/data/subdir/config.yaml"
+func (m *FS) CopyDir(src, dst string) error {
+	base := filepath.Base(src)
+	return filepath.WalkDir(src, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		rel, err := filepath.Rel(src, path)
+		if err != nil {
+			return err
+		}
+		dstPath := filepath.Join(dst, base, rel)
+		if d.IsDir() {
+			return m.MkdirAll(dstPath, d.Type())
+		}
+		return m.WriteFile(dstPath, path)
+	})
+}
+
+// TODO(knqyf263): Remove this method and replace with CopyDir
 func (m *FS) CopyFilesUnder(dir string) error {
 	return filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
 		if err != nil {

pkg/mapfs/fs_test.go

@@ -501,3 +501,58 @@ func TestFS_WithUnderlyingRoot(t *testing.T) {
 	require.NoError(t, err)
 	assert.False(t, fi.IsDir())
 }
+
+func TestFS_CopyDir(t *testing.T) {
+	tmpDst := "dst"
+	tests := []struct {
+		name      string
+		src       string
+		dst       string
+		wantFiles map[string]string // path in dst: want content
+		wantErr   require.ErrorAssertionFunc
+	}{
+		{
+			name: "copy testdata to dst/",
+			src:  "testdata",
+			dst:  tmpDst,
+			wantFiles: map[string]string{
+				tmpDst + "/testdata/hello.txt":        "hello world",
+				tmpDst + "/testdata/b.txt":            "bbb",
+				tmpDst + "/testdata/c.txt":            "",
+				tmpDst + "/testdata/dotfile":          "dotfile",
+				tmpDst + "/testdata/subdir/foo.txt":   "",
+				tmpDst + "/testdata/subdir/..foo.txt": "",
+			},
+			wantErr: require.NoError,
+		},
+		{
+			name: "copy subdir only",
+			src:  "testdata/subdir",
+			dst:  tmpDst + "/subdir2",
+			wantFiles: map[string]string{
+				tmpDst + "/subdir2/subdir/foo.txt":   "",
+				tmpDst + "/subdir2/subdir/..foo.txt": "",
+			},
+			wantErr: require.NoError,
+		},
+		{
+			name:    "non-existent src",
+			src:     "testdata/no_such_dir",
+			dst:     tmpDst + "/no_such",
+			wantErr: require.Error,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			fsys := mapfs.New()
+			err := fsys.CopyDir(tt.src, tt.dst)
+			tt.wantErr(t, err)
+			for path, want := range tt.wantFiles {
+				got, err := fsys.ReadFile(path)
+				require.NoError(t, err, path)
+				assert.Equal(t, want, string(got), path)
+			}
+		})
+	}
+}