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package ioutils
import (
"io"
"os"
"path/filepath"
)
// todo: split docker/pkg/ioutils into a separate repo
// AtomicWriteFile atomically writes data to a file specified by filename.
func AtomicWriteFile(filename string, data []byte, perm os.FileMode) error {
f, err := os.CreateTemp(filepath.Dir(filename), ".tmp-"+filepath.Base(filename))
if err != nil {
return err
}
err = os.Chmod(f.Name(), perm)
if err != nil {
f.Close()
return err
}
n, err := f.Write(data)
if err == nil && n < len(data) {
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)
}
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