#!/bin/sh -e
#
# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#


# There are special arguments to apt(8) to prevent aborts if apt woudn't been
# updated after the 19th April 2021 till the bullseye release. The additional
# arguments acknoledge the happend suite change (the apt(8) update does the
# same by itself).
#
# Using '-o $config' instead of the --allow-releaseinfo-change-* parameter
# allows backward compatablility to pre-buster Debian versions.
#
# See more: ticket #861
# https://code.ungleich.ch/ungleich-public/cdist/-/issues/861
apt_opts="-o Acquire::AllowReleaseInfoChange::Suite=true -o Acquire::AllowReleaseInfoChange::Version=true"

# run 'apt-get update' if anything in /etc/apt is newer then /var/lib/apt/lists
#   it will be run a second time on error as a redundancy messure to success
cat << DONE
if find /etc/apt -mindepth 1 -cnewer /var/lib/apt/lists | grep . > /dev/null; then
   apt-get $apt_opts update || apt-get $apt_opts update
fi
DONE