http://www.blevesearch.com/news/Deferred-Cleanup,-Checking-Errors,-and-Potential-Problems/.

useful for snap, where prime command took a lot of time and we need to read progress messages.

noinspection GoExportedFuncWithUnexportedType.

TempDir creates a new temporary directory in the directory dir with a name beginning with prefix and returns the path of the new directory.

TempFile creates a new temporary file in the directory dir with a name beginning with prefix, opens the file for reading and writing, and returns the resulting *os.File.

noinspection GoExportedFuncWithUnexportedType.