rpm-ostree db diff on random dirs

db-diff.sh

#!/bin/bash
set -euo pipefail

# hacky way to use rpm-ostree to perform a db diff
# requires ostree and rpm-ostree installed locally

if [ $# -eq 0 ]; then
    echo "Usage: $0 <from_rpmdb_dir> <to_rpmdb_dir>"
    exit 1
fi

rpmdb_a=$(realpath $1); shift
rpmdb_b=$(realpath $1); shift

tmpd=$(mktemp -d)
trap "rm -rf $tmpd" EXIT
cd $tmpd

ostree init --repo=repo --mode=bare-user
mkdir -p a/usr/share/rpm
cp $rpmdb_a/* a/usr/share/rpm
mkdir -p b/usr/share/rpm
cp $rpmdb_b/* b/usr/share/rpm

rpmdb_a_rev=$(ostree commit --repo=repo --orphan a)
rpmdb_b_rev=$(ostree commit --repo=repo --orphan b)
rpm-ostree --repo=repo db diff $rpmdb_a_rev $rpmdb_b_rev