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