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// Copyright 2016 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.
//go:build !windows
package testenv
import (
"fmt"
"os"
"path/filepath"
"runtime"
)
func hasSymlink() (ok bool, reason string) {
switch runtime.GOOS {
case "plan9":
return false, ""
case "android", "wasip1":
// For wasip1, some runtimes forbid absolute symlinks,
// or symlinks that escape the current working directory.
// Perform a simple test to see whether the runtime
// supports symlinks or not. If we get a permission
// error, the runtime does not support symlinks.
dir, err := os.MkdirTemp("", "")
if err != nil {
return false, ""
}
defer func() {
_ = os.RemoveAll(dir)
}()
fpath := filepath.Join(dir, "testfile.txt")
if err := os.WriteFile(fpath, nil, 0644); err != nil {
return false, ""
}
if err := os.Symlink(fpath, filepath.Join(dir, "testlink")); err != nil {
if SyscallIsNotSupported(err) {
return false, fmt.Sprintf("symlinks unsupported: %s", err.Error())
}
return false, ""
}
}
return true, ""
}
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