932d8c69de
With this change we emulate a case sensitive filesystem on top of insensitive filesystems. This means we correctly pick up case-only renames and throw a case conflict error when there would be multiple files differing only in case. This safety check has a small performance hit (about 20% more filesystem operations when scanning for changes). The new advanced folder option `caseSensitiveFS` can be used to disable the safety checks, retaining the previous behavior on systems known to be fully case sensitive. Co-authored-by: Jakob Borg <jakob@kastelo.net>
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// Copyright (C) 2017 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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// +build !windows
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package fs
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import (
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"os"
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"path/filepath"
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)
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// DebugSymlinkForTestsOnly is not and should not be used in Syncthing code,
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// hence the cumbersome name to make it obvious if this ever leaks. Its
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// reason for existence is the Windows version, which allows creating
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// symlinks when non-elevated.
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func DebugSymlinkForTestsOnly(oldFs, newFs Filesystem, oldname, newname string) error {
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if caseFs, ok := unwrapFilesystem(newFs).(*caseFilesystem); ok {
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if err := caseFs.checkCase(newname); err != nil {
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return err
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}
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caseFs.dropCache()
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}
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if err := os.Symlink(filepath.Join(oldFs.URI(), oldname), filepath.Join(newFs.URI(), newname)); err != nil {
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return err
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}
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return nil
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}
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// unwrapFilesystem removes "wrapping" filesystems to expose the underlying filesystem.
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func unwrapFilesystem(fs Filesystem) Filesystem {
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for {
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switch sfs := fs.(type) {
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case *logFilesystem:
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fs = sfs.Filesystem
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case *walkFilesystem:
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fs = sfs.Filesystem
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case *MtimeFS:
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fs = sfs.Filesystem
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default:
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return sfs
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}
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}
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}
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