...
Run Format

Source file src/os/path.go

  // Copyright 2009 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 os
  
  import (
  	"io"
  	"syscall"
  )
  
  // MkdirAll creates a directory named path,
  // along with any necessary parents, and returns nil,
  // or else returns an error.
  // The permission bits perm are used for all
  // directories that MkdirAll creates.
  // If path is already a directory, MkdirAll does nothing
  // and returns nil.
  func MkdirAll(path string, perm FileMode) error {
  	// Fast path: if we can tell whether path is a directory or file, stop with success or error.
  	dir, err := Stat(path)
  	if err == nil {
  		if dir.IsDir() {
  			return nil
  		}
  		return &PathError{"mkdir", path, syscall.ENOTDIR}
  	}
  
  	// Slow path: make sure parent exists and then call Mkdir for path.
  	i := len(path)
  	for i > 0 && IsPathSeparator(path[i-1]) { // Skip trailing path separator.
  		i--
  	}
  
  	j := i
  	for j > 0 && !IsPathSeparator(path[j-1]) { // Scan backward over element.
  		j--
  	}
  
  	if j > 1 {
  		// Create parent
  		err = MkdirAll(path[0:j-1], perm)
  		if err != nil {
  			return err
  		}
  	}
  
  	// Parent now exists; invoke Mkdir and use its result.
  	err = Mkdir(path, perm)
  	if err != nil {
  		// Handle arguments like "foo/." by
  		// double-checking that directory doesn't exist.
  		dir, err1 := Lstat(path)
  		if err1 == nil && dir.IsDir() {
  			return nil
  		}
  		return err
  	}
  	return nil
  }
  
  // RemoveAll removes path and any children it contains.
  // It removes everything it can but returns the first error
  // it encounters. If the path does not exist, RemoveAll
  // returns nil (no error).
  func RemoveAll(path string) error {
  	// Simple case: if Remove works, we're done.
  	err := Remove(path)
  	if err == nil || IsNotExist(err) {
  		return nil
  	}
  
  	// Otherwise, is this a directory we need to recurse into?
  	dir, serr := Lstat(path)
  	if serr != nil {
  		if serr, ok := serr.(*PathError); ok && (IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
  			return nil
  		}
  		return serr
  	}
  	if !dir.IsDir() {
  		// Not a directory; return the error from Remove.
  		return err
  	}
  
  	// Directory.
  	fd, err := Open(path)
  	if err != nil {
  		if IsNotExist(err) {
  			// Race. It was deleted between the Lstat and Open.
  			// Return nil per RemoveAll's docs.
  			return nil
  		}
  		return err
  	}
  
  	// Remove contents & return first error.
  	err = nil
  	for {
  		names, err1 := fd.Readdirnames(100)
  		for _, name := range names {
  			err1 := RemoveAll(path + string(PathSeparator) + name)
  			if err == nil {
  				err = err1
  			}
  		}
  		if err1 == io.EOF {
  			break
  		}
  		// If Readdirnames returned an error, use it.
  		if err == nil {
  			err = err1
  		}
  		if len(names) == 0 {
  			break
  		}
  	}
  
  	// Close directory, because windows won't remove opened directory.
  	fd.Close()
  
  	// Remove directory.
  	err1 := Remove(path)
  	if err1 == nil || IsNotExist(err1) {
  		return nil
  	}
  	if err == nil {
  		err = err1
  	}
  	return err
  }
  

View as plain text