Check for symlink in cupsd pre-start script

Do not attempt to dereference /run/cups/stamp if it's a symlink.

BUG=chromium:1234882
TEST=cq

Change-Id: I795da90a48ee539ca7990736dbd4a18d2f52dc8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3076092
Reviewed-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Sean Kau <skau@chromium.org>
Tested-by: Pranav Batra <batrapranav@chromium.org>
(cherry picked from commit 50e168c8756f90a0a9da32d3415567804154e11a)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3101389
Auto-Submit: Pranav Batra <batrapranav@chromium.org>
Commit-Queue: Sean Kau <skau@chromium.org>
1 file changed