1 files changed, 0 insertions, 173 deletions
diff --git a/libgo/go/cmd/go/internal/modfetch/unzip.go b/libgo/go/cmd/go/internal/modfetch/unzip.go
deleted file mode 100644
index ac13ede257b..00000000000
--- a/libgo/go/cmd/go/internal/modfetch/unzip.go
+++ /dev/null
@@ -1,173 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package modfetch
-
-import (
-	"archive/zip"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
-	"path"
-	"path/filepath"
-	"strings"
-
-	"cmd/go/internal/modfetch/codehost"
-	"cmd/go/internal/module"
-	"cmd/go/internal/str"
-)
-
-func Unzip(dir, zipfile, prefix string, maxSize int64) error {
-	// TODO(bcmills): The maxSize parameter is invariantly 0. Remove it.
-	if maxSize == 0 {
-		maxSize = codehost.MaxZipFile
-	}
-
-	// Directory can exist, but must be empty.
-	files, _ := ioutil.ReadDir(dir)
-	if len(files) > 0 {
-		return fmt.Errorf("target directory %v exists and is not empty", dir)
-	}
-	if err := os.MkdirAll(dir, 0777); err != nil {
-		return err
-	}
-
-	f, err := os.Open(zipfile)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	info, err := f.Stat()
-	if err != nil {
-		return err
-	}
-
-	z, err := zip.NewReader(f, info.Size())
-	if err != nil {
-		return fmt.Errorf("unzip %v: %s", zipfile, err)
-	}
-
-	foldPath := make(map[string]string)
-	var checkFold func(string) error
-	checkFold = func(name string) error {
-		fold := str.ToFold(name)
-		if foldPath[fold] == name {
-			return nil
-		}
-		dir := path.Dir(name)
-		if dir != "." {
-			if err := checkFold(dir); err != nil {
-				return err
-			}
-		}
-		if foldPath[fold] == "" {
-			foldPath[fold] = name
-			return nil
-		}
-		other := foldPath[fold]
-		return fmt.Errorf("unzip %v: case-insensitive file name collision: %q and %q", zipfile, other, name)
-	}
-
-	// Check total size, valid file names.
-	var size int64
-	for _, zf := range z.File {
-		if !str.HasPathPrefix(zf.Name, prefix) {
-			return fmt.Errorf("unzip %v: unexpected file name %s", zipfile, zf.Name)
-		}
-		if zf.Name == prefix || strings.HasSuffix(zf.Name, "/") {
-			continue
-		}
-		name := zf.Name[len(prefix)+1:]
-		if err := module.CheckFilePath(name); err != nil {
-			return fmt.Errorf("unzip %v: %v", zipfile, err)
-		}
-		if err := checkFold(name); err != nil {
-			return err
-		}
-		if path.Clean(zf.Name) != zf.Name || strings.HasPrefix(zf.Name[len(prefix)+1:], "/") {
-			return fmt.Errorf("unzip %v: invalid file name %s", zipfile, zf.Name)
-		}
-		s := int64(zf.UncompressedSize64)
-		if s < 0 || maxSize-size < s {
-			return fmt.Errorf("unzip %v: content too large", zipfile)
-		}
-		size += s
-	}
-
-	// Unzip, enforcing sizes checked earlier.
-	for _, zf := range z.File {
-		if zf.Name == prefix || strings.HasSuffix(zf.Name, "/") {
-			continue
-		}
-		name := zf.Name[len(prefix):]
-		dst := filepath.Join(dir, name)
-		if err := os.MkdirAll(filepath.Dir(dst), 0777); err != nil {
-			return err
-		}
-		w, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0444)
-		if err != nil {
-			return fmt.Errorf("unzip %v: %v", zipfile, err)
-		}
-		r, err := zf.Open()
-		if err != nil {
-			w.Close()
-			return fmt.Errorf("unzip %v: %v", zipfile, err)
-		}
-		lr := &io.LimitedReader{R: r, N: int64(zf.UncompressedSize64) + 1}
-		_, err = io.Copy(w, lr)
-		r.Close()
-		if err != nil {
-			w.Close()
-			return fmt.Errorf("unzip %v: %v", zipfile, err)
-		}
-		if err := w.Close(); err != nil {
-			return fmt.Errorf("unzip %v: %v", zipfile, err)
-		}
-		if lr.N <= 0 {
-			return fmt.Errorf("unzip %v: content too large", zipfile)
-		}
-	}
-
-	return nil
-}
-
-// makeDirsReadOnly makes a best-effort attempt to remove write permissions for dir
-// and its transitive contents.
-func makeDirsReadOnly(dir string) {
-	type pathMode struct {
-		path string
-		mode os.FileMode
-	}
-	var dirs []pathMode // in lexical order
-	filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
-		if err == nil && info.Mode()&0222 != 0 {
-			if info.IsDir() {
-				dirs = append(dirs, pathMode{path, info.Mode()})
-			}
-		}
-		return nil
-	})
-
-	// Run over list backward to chmod children before parents.
-	for i := len(dirs) - 1; i >= 0; i-- {
-		os.Chmod(dirs[i].path, dirs[i].mode&^0222)
-	}
-}
-
-// RemoveAll removes a directory written by Download or Unzip, first applying
-// any permission changes needed to do so.
-func RemoveAll(dir string) error {
-	// Module cache has 0555 directories; make them writable in order to remove content.
-	filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return nil // ignore errors walking in file system
-		}
-		if info.IsDir() {
-			os.Chmod(path, 0777)
-		}
-		return nil
-	})
-	return os.RemoveAll(dir)
-}