mirror of
https://github.com/octoleo/syncthing.git
synced 2024-12-22 10:58:57 +00:00
e82ed6e3d3
Literally `gofumpt -w .` from the top level dir. Guaranteed to be minor style changes only and nothing else. @imsodin per request?
66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
// 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 osutil
|
|
|
|
import (
|
|
"os"
|
|
"path/filepath"
|
|
"strconv"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/syncthing/syncthing/lib/fs"
|
|
)
|
|
|
|
var (
|
|
rand uint32
|
|
randmu sync.Mutex
|
|
)
|
|
|
|
func reseed() uint32 {
|
|
return uint32(time.Now().UnixNano() + int64(os.Getpid()))
|
|
}
|
|
|
|
func nextSuffix() string {
|
|
randmu.Lock()
|
|
r := rand
|
|
if r == 0 {
|
|
r = reseed()
|
|
}
|
|
r = r*1664525 + 1013904223 // constants from Numerical Recipes
|
|
rand = r
|
|
randmu.Unlock()
|
|
return strconv.Itoa(int(1e9 + r%1e9))[1:]
|
|
}
|
|
|
|
// TempFile creates a new temporary file in the directory dir
|
|
// with a name beginning with prefix, opens the file for reading
|
|
// and writing, and returns the resulting *os.File.
|
|
// If dir is the empty string, TempFile uses the default directory
|
|
// for temporary files (see os.TempDir).
|
|
// Multiple programs calling TempFile simultaneously
|
|
// will not choose the same file. The caller can use f.Name()
|
|
// to find the pathname of the file. It is the caller's responsibility
|
|
// to remove the file when no longer needed.
|
|
func TempFile(filesystem fs.Filesystem, dir, prefix string) (f fs.File, err error) {
|
|
nconflict := 0
|
|
for i := 0; i < 10000; i++ {
|
|
name := filepath.Join(dir, prefix+nextSuffix())
|
|
f, err = filesystem.OpenFile(name, fs.OptReadWrite|fs.OptCreate|fs.OptExclusive, 0o600)
|
|
if fs.IsExist(err) {
|
|
if nconflict++; nconflict > 10 {
|
|
randmu.Lock()
|
|
rand = reseed()
|
|
randmu.Unlock()
|
|
}
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
return
|
|
}
|