Build https://launchpad.net/~smoser/+archive/ubuntu/swtpm for ubuntu-20.10 with the python scripts included

build.sh

#!/bin/bash

set -eux

# FROM ubuntu:20.10

export DEBIAN_FRONTEND=noninteractive
ln -sf /usr/share/zoneinfo/GMT /etc/localtime

sed -i -e 's/^# deb/deb/' /etc/apt/sources.list
apt update
apt install -y build-essential vim-tiny git wget curl devscripts dh-python
apt build-dep -y libtpms
apt install -y libfuse-dev libglib2.0-dev libgmp-dev expect libtasn1-dev socat python3-cryptography python3-setuptools python3-twisted gnutls-dev gnutls-bin net-tools softhsm2 libseccomp-dev
dpkg-reconfigure --frontend noninteractive tzdata

EMAIL="${EMAIL:-vincent@kinvolk.io}"
NAME="${NAME:-Vincent Batts}"

git config --global user.email "${EMAIL}"
git config --global user.name "${NAME}"

OUTPUT=${OUTPUT:-/tmp}
#PPA="ppa:smoser/swtpm"
libtpms_ver="0.7.7"
swtpm_ver="0.5.2"
swtpm_url="${SWTPM_URL:-https://github.com/stefanberger/swtpm}"
ubuntu_release="groovy"

notnative() {
    # these are not native, but debian/source/fromat says so
    local dsf="debian/source/format"
    grep -q "native" "$dsf" || return 0
    echo "3.0 (quilt)" > "$dsf" 
    git commit -m "not native package" "$dsf"
}

setrel() {
    local rel="$1"
    sed -i "1s/\([^ ]\+\) \([^ ]\+\) \([^;]\+\);/\1 \2 $rel;/g" debian/changelog
}

wget -O libtpms_${libtpms_ver}.orig.tar.gz \
    https://github.com/stefanberger/libtpms/archive/v${libtpms_ver}.tar.gz


# build libtpms
git clone https://github.com/stefanberger/libtpms.git
cd libtpms
git checkout v${libtpms_ver}
notnative
setrel "${ubuntu_release}"

debuild --no-sign -nc 
#dput $PPA ../libtpms_${libtpms_ver}-1_source.changes

cd ..

apt install -y ./libtpms*_${libtpms_ver}_*.deb

# build swtpm
wget -O swtpm_${swtpm_ver}.orig.tar.gz \
    ${swtpm_url}/archive/v${swtpm_ver}.tar.gz
    
git clone ${swtpm_url}
cd swtpm
git checkout v${swtpm_ver}
notnative
setrel "${ubuntu_release}"

debuild --no-sign -nc
#dput $PPA ../libtpms_${libtpms_ver}-1_source.changes

cd ..

cp *deb "${OUTPUT}"/

# vim:set sts=2 sw=2 et:

Makefile

IMAGE   := ubuntu:20.10
CWD     := $(shell pwd)
NAME    := $(shell git config user.name)
EMAIL   := $(shell git config user.email)

SWTPM_URL := https://github.com/stefanberger/swtpm

build: build.sh output
        docker run \
                -it \
                --rm \
                -v $(CWD):/build \
                --env NAME="$(NAME)" \
                --env EMAIL="$(EMAIL)" \
                --env SWTPM_URL="$(SWTPM_URL)" \
                --env OUTPUT="/build/output/" \
                $(IMAGE) \
                bash /build/build.sh

output:
        mkdir -p output

To build rpm packages doing the same thing, please have a look: https://gist.github.com/dongsupark/5716f464cf04b977faa15d3056504cbf