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Source file src/os/removeall_noat.go

Documentation: os

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris
     6  // +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
     7  
     8  package os
     9  
    10  import (
    11  	"io"
    12  	"runtime"
    13  	"syscall"
    14  )
    15  
    16  func removeAll(path string) error {
    17  	if path == "" {
    18  		// fail silently to retain compatibility with previous behavior
    19  		// of RemoveAll. See issue 28830.
    20  		return nil
    21  	}
    22  
    23  	// The rmdir system call permits removing "." on Plan 9,
    24  	// so we don't permit it to remain consistent with the
    25  	// "at" implementation of RemoveAll.
    26  	if endsWithDot(path) {
    27  		return &PathError{Op: "RemoveAll", Path: path, Err: syscall.EINVAL}
    28  	}
    29  
    30  	// Simple case: if Remove works, we're done.
    31  	err := Remove(path)
    32  	if err == nil || IsNotExist(err) {
    33  		return nil
    34  	}
    35  
    36  	// Otherwise, is this a directory we need to recurse into?
    37  	dir, serr := Lstat(path)
    38  	if serr != nil {
    39  		if serr, ok := serr.(*PathError); ok && (IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
    40  			return nil
    41  		}
    42  		return serr
    43  	}
    44  	if !dir.IsDir() {
    45  		// Not a directory; return the error from Remove.
    46  		return err
    47  	}
    48  
    49  	// Remove contents & return first error.
    50  	err = nil
    51  	for {
    52  		fd, err := Open(path)
    53  		if err != nil {
    54  			if IsNotExist(err) {
    55  				// Already deleted by someone else.
    56  				return nil
    57  			}
    58  			return err
    59  		}
    60  
    61  		const reqSize = 1024
    62  		var names []string
    63  		var readErr error
    64  
    65  		for {
    66  			numErr := 0
    67  			names, readErr = fd.Readdirnames(reqSize)
    68  
    69  			for _, name := range names {
    70  				err1 := RemoveAll(path + string(PathSeparator) + name)
    71  				if err == nil {
    72  					err = err1
    73  				}
    74  				if err1 != nil {
    75  					numErr++
    76  				}
    77  			}
    78  
    79  			// If we can delete any entry, break to start new iteration.
    80  			// Otherwise, we discard current names, get next entries and try deleting them.
    81  			if numErr != reqSize {
    82  				break
    83  			}
    84  		}
    85  
    86  		// Removing files from the directory may have caused
    87  		// the OS to reshuffle it. Simply calling Readdirnames
    88  		// again may skip some entries. The only reliable way
    89  		// to avoid this is to close and re-open the
    90  		// directory. See issue 20841.
    91  		fd.Close()
    92  
    93  		if readErr == io.EOF {
    94  			break
    95  		}
    96  		// If Readdirnames returned an error, use it.
    97  		if err == nil {
    98  			err = readErr
    99  		}
   100  		if len(names) == 0 {
   101  			break
   102  		}
   103  
   104  		// We don't want to re-open unnecessarily, so if we
   105  		// got fewer than request names from Readdirnames, try
   106  		// simply removing the directory now. If that
   107  		// succeeds, we are done.
   108  		if len(names) < reqSize {
   109  			err1 := Remove(path)
   110  			if err1 == nil || IsNotExist(err1) {
   111  				return nil
   112  			}
   113  
   114  			if err != nil {
   115  				// We got some error removing the
   116  				// directory contents, and since we
   117  				// read fewer names than we requested
   118  				// there probably aren't more files to
   119  				// remove. Don't loop around to read
   120  				// the directory again. We'll probably
   121  				// just get the same error.
   122  				return err
   123  			}
   124  		}
   125  	}
   126  
   127  	// Remove directory.
   128  	err1 := Remove(path)
   129  	if err1 == nil || IsNotExist(err1) {
   130  		return nil
   131  	}
   132  	if runtime.GOOS == "windows" && IsPermission(err1) {
   133  		if fs, err := Stat(path); err == nil {
   134  			if err = Chmod(path, FileMode(0200|int(fs.Mode()))); err == nil {
   135  				err1 = Remove(path)
   136  			}
   137  		}
   138  	}
   139  	if err == nil {
   140  		err = err1
   141  	}
   142  	return err
   143  }
   144  

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