syncthing/lib/fs/debug_symlink_unix.go

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// Copyright (C) 2017 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
// +build !windows
package fs
import (
"os"
"path/filepath"
)
// DebugSymlinkForTestsOnly is not and should not be used in Syncthing code,
// hence the cumbersome name to make it obvious if this ever leaks. Its
// reason for existence is the Windows version, which allows creating
// symlinks when non-elevated.
func DebugSymlinkForTestsOnly(oldFs, newFs Filesystem, oldname, newname string) error {
if caseFs, ok := unwrapFilesystem(newFs).(*caseFilesystem); ok {
if err := caseFs.checkCase(newname); err != nil {
return err
}
caseFs.dropCache()
}
if err := os.Symlink(filepath.Join(oldFs.URI(), oldname), filepath.Join(newFs.URI(), newname)); err != nil {
return err
}
return nil
}
// unwrapFilesystem removes "wrapping" filesystems to expose the underlying filesystem.
func unwrapFilesystem(fs Filesystem) Filesystem {
for {
switch sfs := fs.(type) {
case *logFilesystem:
fs = sfs.Filesystem
case *walkFilesystem:
fs = sfs.Filesystem
case *MtimeFS:
fs = sfs.Filesystem
default:
return sfs
}
}
}