1 files changed, 27 insertions, 0 deletions
diff --git a/libgo/go/cmd/go/internal/modload/stat_openfile.go b/libgo/go/cmd/go/internal/modload/stat_openfile.go
new file mode 100644
index 00000000000..931aaf1577b
--- /dev/null
+++ b/libgo/go/cmd/go/internal/modload/stat_openfile.go
@@ -0,0 +1,27 @@
+// 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 aix js,wasm plan9
+
+// On plan9, per http://9p.io/magic/man2html/2/access: “Since file permissions
+// are checked by the server and group information is not known to the client,
+// access must open the file to check permissions.”
+//
+// aix and js,wasm are similar, in that they do not define syscall.Access.
+
+package modload
+
+import (
+	"os"
+)
+
+// hasWritePerm reports whether the current user has permission to write to the
+// file with the given info.
+func hasWritePerm(path string, _ os.FileInfo) bool {
+	if f, err := os.OpenFile(path, os.O_WRONLY, 0); err == nil {
+		f.Close()
+		return true
+	}
+	return false
+}