debian_source_trace_pyassimp.sh

# https://wiki.debian.org/Packaging/SourcePackage

apt-cache policy python3-pyassimp
# Focal
vim /etc/apt/sources.list
# Uncomment line: deb-src http://archive.ubuntu.com/ubuntu/ focal universe
apt update

apt-cache showsrc python3-pyassimp
# See "Vcs-Git"
# Trace to: https://salsa.debian.org/debian/assimp/-/tree/debian/5.0.1_ds0-1

git clone -o upstream https://github.com/assimp/assimp
cd assimp
git remote add debian https://salsa.debian.org/debian/assimp.git
git fetch debian --tags
git fetch debian debian/5.0.1_ds0-1

# Note that source in this tree is *still the same as upstream*.

# Now get the source.
cd /tmp
apt-get source python3-pyassimp
cd assimp-5.0.1~ds0
# *Now* we see the changes applied to the source.

# They actually live in 
# https://salsa.debian.org/debian/assimp/-/tree/debian/5.0.1_ds0-1/debian/patches