blob: a53d17e93a8a67a3b42744f4a4d9f50ae3f220c8 [file] [log] [blame]
// Copyright 2019 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.
// +build darwin dragonfly freebsd hurd linux netbsd openbsd solaris
package modload
import (
// hasWritePerm reports whether the current user has permission to write to the
// file with the given info.
// Although the root user on most Unix systems can write to files even without
// permission, hasWritePerm reports false if no appropriate permission bit is
// set even if the current user is root.
func hasWritePerm(path string, fi os.FileInfo) bool {
if os.Getuid() == 0 {
// The root user can access any file, but we still want to default to
// read-only mode if the go.mod file is marked as globally non-writable.
// (If the user really intends not to be in readonly mode, they can
// pass -mod=mod explicitly.)
return fi.Mode()&0222 != 0
const W_OK = 0x2
return syscall.Access(path, W_OK) == nil