helper-scripts: add repack-deb11 skript

This script helps repacking a debian-12 debian package format into a debian-11 installable format

Signed-off-by: Heinrich Toews <ht@twx-software.de>

helper-scripts/repack-deb11.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+repack_debfile () {
+	debfile=$1
+	debfile_base="${debfile%.*}"
+	tempdir=".tmp/"
+
+	echo "Repacking: ${debfile} ..."
+
+	echo "Creating ${tempdir} ..."
+	mkdir ${tempdir}
+
+	echo "Extracting ${debfile} to ${tempdir} ..."
+	ar x --output=.tmp/ ${debfile}
+
+	cd ${tempdir}
+
+	echo "Creating control.tar.xz ..."
+	zstd -d < control.tar.zst | xz > control.tar.xz
+
+	echo "Creating data.tar.xz ..."
+	zstd -d < data.tar.zst | xz > data.tar.xz
+
+	echo "Packing control.tar.xz data.tar.xz into ${debfile_base}_deb11.deb ..."
+	ar -m -c -a sdsd ../${debfile_base}_deb11.deb debian-binary control.tar.xz data.tar.xz
+
+	cd ..
+
+	echo "Clean up ..."
+	rm -rf ${tempdir}
+
+	echo "Debian package <${debfile_base}_deb11.deb> is ready!"
+}
+
+repack_debfile $1
+
+exit 0
+