Eli Schwartz authored Feb 20, 2019 and Allan McRae committed Feb 21, 2019

When pacman is run as root to do -S, -U, or -R, it would immediately
abort if pacman is not ready for use. Instead, poll the lockfile and
wait until it becomes available.

Implements FS#28840

Original-patch-by: Georges Dubus <georges.dubus@compiletoi.net>
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>