Source file src/internal/testenv/testenv_windows.go

     1	// Copyright 2016 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	package testenv
     6	
     7	import (
     8		"io/ioutil"
     9		"os"
    10		"path/filepath"
    11		"sync"
    12		"syscall"
    13	)
    14	
    15	var symlinkOnce sync.Once
    16	var winSymlinkErr error
    17	
    18	func initWinHasSymlink() {
    19		tmpdir, err := ioutil.TempDir("", "symtest")
    20		if err != nil {
    21			panic("failed to create temp directory: " + err.Error())
    22		}
    23		defer os.RemoveAll(tmpdir)
    24	
    25		err = os.Symlink("target", filepath.Join(tmpdir, "symlink"))
    26		if err != nil {
    27			err = err.(*os.LinkError).Err
    28			switch err {
    29			case syscall.EWINDOWS, syscall.ERROR_PRIVILEGE_NOT_HELD:
    30				winSymlinkErr = err
    31			}
    32		}
    33	}
    34	
    35	func hasSymlink() (ok bool, reason string) {
    36		symlinkOnce.Do(initWinHasSymlink)
    37	
    38		switch winSymlinkErr {
    39		case nil:
    40			return true, ""
    41		case syscall.EWINDOWS:
    42			return false, ": symlinks are not supported on your version of Windows"
    43		case syscall.ERROR_PRIVILEGE_NOT_HELD:
    44			return false, ": you don't have enough privileges to create symlinks"
    45		}
    46	
    47		return false, ""
    48	}
    49	

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