Code review comment for lp:~brendan-donegan/phablet-tools/bug1411697

> This won't suffice for deleting an existing problematic folder. You need
> "exec_with_adb rm -rf /tmp/phablet-run-test/" to remove it in all cases.

Thanks, that is a possible corner case. Doing that makes the second call to rm -rf redundant too so I removed that