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lib/fs/tempname.go
59 строк
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Gusted
lib/sha256: Remove it (#9643)
10 авг 2024, 14:58
Не верифицирован
10 авг 2024, 14:58
356c505
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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()) }