Extract and repackage deb (Debian) file

.bash

#!/bin/bash

# Extract the data files to `repack` directory
dpkg -x some-package_amd64.deb repack

# Extract the control files to repack/DEBIAN directory
# using DEBIAN as control file output is important to repacakge
dpkg -e some-package_amd64.deb repack/DEBIAN

# Make some modification as necessary

# Repackage
# It will generate repack.deb file
dpkg-deb --build -Zgzip repack/
mv repack.deb package-name-version-arch.deb
# Compressions supported are: gzip, xz, zstd
# I've used -Zgzip, this will make sure the deb file have maximum backward compatibility