icinga2: Add diff tool

.gitignore

+/.debian_packaging/

diff

+#!/bin/bash
+
+set -e
+
+cd "$(readlink -f "$(dirname "$0")")"
+
+target="${1%/}"
+branch="$target"
+debian_git=https://anonscm.debian.org/git/pkg-nagios/pkg-icinga2.git
+
+case "$target" in
+  jessie|wheezy)
+    branch="debmon-$target"
+    ;;
+  stretch)
+    branch=master
+    ;;
+  ubuntu)
+    ;;
+  *)
+    echo "Please specify what to diff, target '$target' is unknown!" >&2
+    exit 1
+    ;;
+esac
+
+if [ ! -d .debian_packaging ]; then
+  git clone -q "$debian_git" .debian_packaging/
+else
+  ( cd .debian_packaging && git fetch )
+fi
+
+(
+  cd .debian_packaging/
+  git clean -qfdx
+  git checkout -fq "$branch"
+  git pull -q
+)
+
+echo "# Diffing from Debian packaging"
+echo "# GIT Url: $debian_git"
+echo "# Branch: $branch"
+echo "#"
+
+# check version
+version_here=`dpkg-parsechangelog -S Version -l "$target"/debian/changelog`
+version_debian=`dpkg-parsechangelog -S Version -l .debian_packaging/debian/changelog`
+
+if dpkg --compare-versions "$version_debian" gt "$version_here"
+then
+  echo "# NEWER VERSION ON DEBIAN!" >&2
+fi
+
+echo "# Icinga version: $version_here"
+echo "# Debian version: $version_debian"
+echo "#"
+echo "# You can update the version with the following command:"
+echo "#  dch --changelog $target/debian/changelog --newversion '$version_debian' --distribution 'icinga-$target'"
+echo "#"
+
+diff -Naur -x "changelog" .debian_packaging/debian/ "$target"/debian/