waiting for subprocess to finish before reading output was causing buffers to overflow and hanging the subprocess.  Placing readlines before wait solves the problem.
waiting for subprocess to finish before reading output was causing buffers to overflow and hanging the subprocess.  Placing readlines before wait solves the problem.

pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux,pnkfelix/tamarin-redux,pfgenyun/tamarin-redux,pnkfelix/tamarin-redux