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// Create a temporary file in the directory of the given destination
// file, then rename the temporary file over the destination file if
// writes to the temporary file complete without error.
//
// Used to atomically update files.
//
// Note: This is not guaranteed and depends on the sync semantics of the
// underlying filesystem.
package atomictemp
import (
"io"
"os"
"path/filepath"
)
// Create a temporary file in the directory of the given destination
// file, then rename the temporary file over the destination file if
// writes to the temporary file complete without error.
//
// Used to atomically update files.
//
// Note: This is not guaranteed and depends on the sync semantics of the
// underlying filesystem.
func Create(dstPath string, fn func(io.Writer) error) error {
// open temp output file
f, err := os.CreateTemp(filepath.Dir(dstPath), "")
if err != nil {
return err
}
// build absolute path to temporary file
// tmpPath := filepath.Join(filepath.Dir(dstPath), f.Name())
defer os.Remove(f.Name())
// invoke callback
if err = fn(f); err != nil {
return err
}
// close temp file
if err = f.Close(); err != nil {
return err
}
// rename to destination file, return result
return os.Rename(f.Name(), dstPath)
}
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