112 lines
3.0 KiB
Go
112 lines
3.0 KiB
Go
/*
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Copyright IBM Corp. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0
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*/
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package externalbuilder
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import (
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"io"
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"os"
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"path/filepath"
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"strings"
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"github.com/hyperledger/fabric/common/flogging"
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"github.com/pkg/errors"
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)
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// CopyDir creates a copy of a dir
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func CopyDir(logger *flogging.FabricLogger, srcroot, destroot string) error {
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err := filepath.Walk(srcroot, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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srcsubpath, err := filepath.Rel(srcroot, path)
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if err != nil {
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return err
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}
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destpath := filepath.Join(destroot, srcsubpath)
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switch {
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case info.IsDir():
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return os.MkdirAll(destpath, info.Mode())
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case info.Mode()&os.ModeSymlink == os.ModeSymlink:
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// filepath.Walk does not follow symbolic links; we need to copy
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// symbolic links as-is because some chaincode types (Node.js) rely
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// on the use of symbolic links.
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return copySymlink(srcroot, path, destpath)
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case info.Mode().IsRegular():
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// Intermediate directories are ensured to exist because parent
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// node is always visited before children in `filepath.Walk`.
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return copyFile(path, destpath)
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default:
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// It's something else that we don't support copying (device, socket, etc)
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return errors.Errorf("refusing to copy unsupported file %s with mode %o", path, info.Mode())
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}
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})
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// If an error occurred, clean up any created files.
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if err != nil {
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if err := os.RemoveAll(destroot); err != nil {
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logger.Errorf("failed to remove destination directory %s after copy error: %s", destroot, err)
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}
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return errors.WithMessagef(err, "failed to copy %s to %s", srcroot, destroot)
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}
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return nil
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}
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func copySymlink(srcroot, srcpath, destpath string) error {
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// If the symlink is absolute, then we do not want to copy it.
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symlinkDest, err := os.Readlink(srcpath)
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if err != nil {
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return err
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}
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if filepath.IsAbs(symlinkDest) {
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return errors.Errorf("refusing to copy absolute symlink %s -> %s", srcpath, symlinkDest)
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}
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// Determine where the symlink points to. If it points outside
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// of the source root, then we do not want to copy it.
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symlinkDir := filepath.Dir(srcpath)
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symlinkTarget := filepath.Clean(filepath.Join(symlinkDir, symlinkDest))
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relativeTarget, err := filepath.Rel(srcroot, symlinkTarget)
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if err != nil {
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return err
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}
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if relativeTargetElements := strings.Split(relativeTarget, string(os.PathSeparator)); len(relativeTargetElements) >= 1 && relativeTargetElements[0] == ".." {
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return errors.Errorf("refusing to copy symlink %s -> %s pointing outside of source root", srcpath, symlinkDest)
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}
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return os.Symlink(symlinkDest, destpath)
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}
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func copyFile(srcpath, destpath string) error {
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srcFile, err := os.Open(srcpath)
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if err != nil {
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return err
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}
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defer srcFile.Close()
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info, err := srcFile.Stat()
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if err != nil {
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return err
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}
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destFile, err := os.Create(destpath)
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if err != nil {
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return err
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}
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defer destFile.Close()
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if err = os.Chmod(destFile.Name(), info.Mode()); err != nil {
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return err
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}
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if _, err = io.Copy(destFile, srcFile); err != nil {
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return err
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}
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return nil
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}
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