wehub-resource-sync
88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
// Copyright 2023 Dolthub, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package file
|
|
|
|
import (
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
"runtime"
|
|
)
|
|
|
|
func SyncDirectoryHandle(dir string) (err error) {
|
|
if runtime.GOOS == "windows" {
|
|
// directory sync not supported on Windows
|
|
return
|
|
}
|
|
var d *os.File
|
|
if d, err = os.Open(dir); err != nil {
|
|
return err
|
|
}
|
|
defer d.Close()
|
|
return d.Sync()
|
|
}
|
|
|
|
// WriteFileAtomically will attempt to write the contents of |rd| to a file named
|
|
// |name|, atomically. It uses POSIX filesystem semantics to attempt to
|
|
// accomplish this. It writes the entire contents of |rd| to a temporary file,
|
|
// fsync's the file, renames the file to its desired name, and then fsyncs the
|
|
// directory handle for the directory where these operations took place.
|
|
//
|
|
// Note: On non-Unix platforms, os.Rename is not an atomic operation.
|
|
func WriteFileAtomically(name string, rd io.Reader, mode os.FileMode) error {
|
|
name, err := filepath.Abs(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
dir := filepath.Dir(name)
|
|
f, err := os.CreateTemp(dir, filepath.Base(name)+"-*")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = io.Copy(f, rd)
|
|
if err != nil {
|
|
f.Close()
|
|
os.Remove(f.Name())
|
|
return err
|
|
}
|
|
|
|
err = f.Sync()
|
|
if err != nil {
|
|
f.Close()
|
|
os.Remove(f.Name())
|
|
return err
|
|
}
|
|
|
|
err = f.Close()
|
|
if err != nil {
|
|
os.Remove(f.Name())
|
|
return err
|
|
}
|
|
|
|
err = os.Chmod(f.Name(), mode)
|
|
if err != nil {
|
|
os.Remove(f.Name())
|
|
return err
|
|
}
|
|
|
|
err = os.Rename(f.Name(), name)
|
|
if err != nil {
|
|
os.Remove(f.Name())
|
|
return err
|
|
}
|
|
|
|
return SyncDirectoryHandle(filepath.Dir(f.Name()))
|
|
}
|