CopyDirToTmp copies dir to a temporary test directory using CopyTestFiles and returns the path to the test directory.

CopyFS copies the files and directories in src to a destination directory dst.

ExtractTxtar writes each archive file to the corresponding location beneath dir.

ExtractTxtarFileToTmp read a txtar archive on a given path, extracts it to a temporary directory, and returns the temporary directory.

ExtractTxtarToTmp extracts the given archive to a temp directory, and returns that temporary directory.