@@ -0,0 +1,62 @@
+package file
+
+import (
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+
+	"gitlab.com/tozd/go/errors"
+)
+
+func Exists(path string) bool {
+	stat, err := os.Stat(path)
+	if err != nil && !errors.Is(err, fs.ErrNotExist) {
+		panic("could not stat path " + path + ": " + err.Error())
+	}
+
+	return stat != nil
+}
+
+func Copy(src, dest string) error {
+	stat, err := os.Stat(src)
+	if err != nil {
+		return errors.WithMessage(err, "could not stat source file")
+	}
+
+	sf, err := os.Open(src)
+	if err != nil {
+		return errors.WithMessage(err, "could not open source file for reading")
+	}
+	defer sf.Close()
+
+	df, err := os.OpenFile(dest, os.O_RDWR|os.O_CREATE, stat.Mode())
+	if err != nil {
+		return errors.WithMessage(err, "could not open destination file for writing")
+	}
+	defer df.Close()
+
+	if _, err := io.Copy(df, sf); err != nil {
+		return errors.WithMessage(err, "could not copy")
+	}
+
+	err = df.Sync()
+	if err != nil {
+		return errors.WithMessage(err, "could not call fsync")
+	}
+
+	return nil
+}
+
+func CleanDir(dir string) (err error) {
+	files, err := os.ReadDir(dir)
+	if err != nil {
+		return errors.WithMessage(err, "could not read directory")
+	}
+
+	for _, file := range files {
+		err = errors.Join(err, os.Remove(filepath.Join(dir, file.Name())))
+	}
+
+	return err
+}