#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
    set -o xtrace
fi

if [[ "${1-}" =~ ^-*h(elp)?$ || $# -eq 0 ]]; then
	echo "Usage: ./$(basename "$0") package.deb

Convert .deb package to .rpm hopefully avoiding conflicts and speeding up 
rpmbuild. Uses /tmp and copies resulting .rpm to directory where script
was run.

Requires: alien, rpmbuild, sudo, bash, find, sed.

"
    exit
fi

sudo -v

PKG_FILE="$1"
OLD_DIR="$PWD"
TEMP_DIR=$(mktemp -d)
cp "$PKG_FILE" "$TEMP_DIR"
cd "$TEMP_DIR"

sudo alien -g -v -r "$PKG_FILE"
WORK_DIR=$(find ./ -mindepth 1 -maxdepth 1 -type d | sed 's#./##')

sudo sed -i 's#^%dir.*"/"##' "$WORK_DIR"/*.spec
sudo sed -i 's#^%dir.*"/usr/"##' "$WORK_DIR"/*.spec
sudo sed -i 's#^%dir.*"/usr/bin/"##' "$WORK_DIR"/*.spec
sudo sed -i 's#^%dir.*"/usr/lib/"##' "$WORK_DIR"/*.spec
sudo sed -i 's#^%dir.*"/usr/share/"##' "$WORK_DIR"/*.spec

cd "$WORK_DIR"
sudo rpmbuild --define "_binary_payload w7T0.zstdio" --buildroot="$PWD" \
	-bb "$PWD/$WORK_DIR"*.spec --noclean
mv -v "$TEMP_DIR"/*.rpm "$OLD_DIR"
sudo rm -rf "$TEMP_DIR"