1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
package continuity
import (
"io"
"io/ioutil"
"os"
"path/filepath"
)
// atomicWriteFile writes data to a file by first writing to a temp
// file and calling rename.
func atomicWriteFile(filename string, r io.Reader, rf RegularFile) error {
f, err := ioutil.TempFile(filepath.Dir(filename), ".tmp-"+filepath.Base(filename))
if err != nil {
return err
}
err = os.Chmod(f.Name(), rf.Mode())
if err != nil {
f.Close()
return err
}
n, err := io.Copy(f, r)
if err == nil && n < rf.Size() {
f.Close()
return io.ErrShortWrite
}
if err != nil {
f.Close()
return err
}
if err := f.Sync(); err != nil {
f.Close()
return err
}
if err := f.Close(); err != nil {
return err
}
return os.Rename(f.Name(), filename)
}
|
