#!/bin/sh
# check if package system is locked
# return 0 if unlocked, 2 if locked, 1 on error
set -e

for f in /var/lib/dpkg/lock /var/cache/apt/archives/lock \
/var/lib/apt/lists/lock /run/unattended-upgrades.lock; do
[ -e $f ] || continue

# fuser succeeds if there is at least one user
if fuser $f; then
exit 2
fi
done

exit 0