For given deb-package, creates list of changed files and line-by-line diff.

deb2diffs.sh

#!/bin/sh

Install_me_so='
apt-get install debsums
wget -O /usr/local/bin/deb2diffs https://gist.github.com/ilyaevseev/8818910/raw/67677ef6324554f51aea390e39597ad97140d3de/deb2diffs.sh
chmod +x /usr/local/bin/deb2diffs
'
#set -x

Fail() { echo "$@" 1>&2; exit 1; }

test -n "$1" || Fail "Usage: $0 <pkgname>     Example: deb2diffs otrs2"
pkgname="$1"

debfile="$(find /var/cache/apt/archives/ -maxdepth 1 -type f -name ${pkgname}*.deb | sort -r | head -1)"
test -s "$debfile" || Fail "Missing package ${pkgname}."

longname=$(basename $debfile .deb)
if test -d "$longname"; then
        : Fail "Directory $name already exists."
else
        dpkg -x "$debfile" "$longname"
fi

tstamp="$(LANG=C date +%Y-%m-%d)"

debsums $pkgname |
awk '/FAILED$/ {print $1;}' |
tee "$longname.$tstamp.changed" |
while read filepath; do
        diff -u "${longname}/${filepath}" "${filepath}";
done > "$longname.$tstamp.diff"

## END ##