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- // Copyright (C) 2015 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 (
- "crypto/sha256"
- "fmt"
- "path/filepath"
- "strings"
- "github.com/syncthing/syncthing/lib/build"
- )
- const (
- WindowsTempPrefix = "~syncthing~"
- UnixTempPrefix = ".syncthing."
- )
- func tempPrefix() string {
- if build.IsWindows {
- return WindowsTempPrefix
- } else {
- return UnixTempPrefix
- }
- }
- // Real filesystems usually handle 255 bytes. encfs has varying and
- // confusing file name limits. We take a safe way out and switch to hashing
- // quite early.
- const maxFilenameLength = 160 - len(UnixTempPrefix) - len(".tmp")
- // IsTemporary is true if the file name has the temporary prefix. Regardless
- // of the normally used prefix, the standard Windows and Unix temp prefixes
- // are always recognized as temp files.
- func IsTemporary(name string) bool {
- name = filepath.Base(name)
- return strings.HasPrefix(name, WindowsTempPrefix) ||
- strings.HasPrefix(name, UnixTempPrefix)
- }
- func TempNameWithPrefix(name, prefix string) string {
- tdir := filepath.Dir(name)
- tbase := filepath.Base(name)
- var tname string
- if len(tbase) > maxFilenameLength {
- tname = fmt.Sprintf("%s%x.tmp", prefix, sha256.Sum256([]byte(tbase)))
- } else {
- tname = prefix + tbase + ".tmp"
- }
- return filepath.Join(tdir, tname)
- }
- func TempName(name string) string {
- return TempNameWithPrefix(name, tempPrefix())
- }
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