diff options
Diffstat (limited to 'libgo/go/cmd/go/internal/modload/stat_unix.go')
-rw-r--r-- | libgo/go/cmd/go/internal/modload/stat_unix.go | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/libgo/go/cmd/go/internal/modload/stat_unix.go b/libgo/go/cmd/go/internal/modload/stat_unix.go new file mode 100644 index 00000000000..a53d17e93a8 --- /dev/null +++ b/libgo/go/cmd/go/internal/modload/stat_unix.go @@ -0,0 +1,31 @@ +// 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 ( + "os" + "syscall" +) + +// 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 +} |