6cac308bcd
This adds support for syncing extended attributes on supported filesystem on Linux, macOS, FreeBSD and NetBSD. Windows is currently excluded because the APIs seem onerous and annoying and frankly the uses cases seem few and far between. On Unixes this also covers ACLs as those are stored as extended attributes. Similar to ownership syncing this will optional & opt-in, which two settings controlling the main behavior: one to "sync" xattrs (read & write) and another one to "scan" xattrs (only read them so other devices can "sync" them, but not apply any locally). Co-authored-by: Tomasz Wilczyński <twilczynski@naver.com>
74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
// 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/.
|
|
|
|
package fs
|
|
|
|
import (
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
var execExts map[string]bool
|
|
|
|
func init() {
|
|
// PATHEXT contains a list of executable file extensions, on Windows
|
|
pathext := filepath.SplitList(os.Getenv("PATHEXT"))
|
|
// We want the extensions in execExts to be lower case
|
|
execExts = make(map[string]bool, len(pathext))
|
|
for _, ext := range pathext {
|
|
execExts[strings.ToLower(ext)] = true
|
|
}
|
|
}
|
|
|
|
// isWindowsExecutable returns true if the given path has an extension that is
|
|
// in the list of executable extensions.
|
|
func isWindowsExecutable(path string) bool {
|
|
return execExts[strings.ToLower(filepath.Ext(path))]
|
|
}
|
|
|
|
func (e basicFileInfo) Mode() FileMode {
|
|
m := e.FileInfo.Mode()
|
|
if m&os.ModeSymlink != 0 && e.Size() > 0 {
|
|
// "Symlinks" with nonzero size are in fact "hard" links, such as
|
|
// NTFS deduped files. Remove the symlink bit.
|
|
m &^= os.ModeSymlink
|
|
}
|
|
// Set executable bits on files with executable extensions (.exe, .bat, etc).
|
|
if isWindowsExecutable(e.Name()) {
|
|
m |= 0111
|
|
}
|
|
// There is no user/group/others in Windows' read-only attribute, and
|
|
// all "w" bits are set if the file is not read-only. Do not send these
|
|
// group/others-writable bits to other devices in order to avoid
|
|
// unexpected world-writable files on other platforms.
|
|
m &^= 0022
|
|
return FileMode(m)
|
|
}
|
|
|
|
func (e basicFileInfo) Owner() int {
|
|
return -1
|
|
}
|
|
|
|
func (e basicFileInfo) Group() int {
|
|
return -1
|
|
}
|
|
|
|
func (basicFileInfo) InodeChangeTime() time.Time {
|
|
return time.Time{}
|
|
}
|
|
|
|
// osFileInfo converts e to os.FileInfo that is suitable
|
|
// to be passed to os.SameFile.
|
|
func (e *basicFileInfo) osFileInfo() os.FileInfo {
|
|
fi := e.FileInfo
|
|
if fi, ok := fi.(*dirJunctFileInfo); ok {
|
|
return fi.FileInfo
|
|
}
|
|
return fi
|
|
}
|