algo/files/cloud-init/base.sh

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#!/bin/sh
set -eux
# shellcheck disable=SC2230
which sudo || until \
apt-get update -y && \
apt-get install sudo -yf --install-suggests; do
sleep 3
done
getent passwd algo || useradd -m -d /home/algo -s /bin/bash -G adm -p '!' algo
(umask 337 && echo "algo ALL=(ALL) NOPASSWD:ALL" >/etc/sudoers.d/10-algo-user)
cat <<EOF >/etc/ssh/sshd_config
{{ lookup('template', 'files/cloud-init/sshd_config') }}
EOF
test -d /home/algo/.ssh || sudo -u algo mkdir -m 0700 /home/algo/.ssh
echo "{{ lookup('file', '{{ SSH_keys.public }}') }}" | (sudo -u algo tee /home/algo/.ssh/authorized_keys && chmod 0600 /home/algo/.ssh/authorized_keys)
# shellcheck disable=SC2015
dpkg -l sshguard && until apt-get remove -y --purge sshguard; do
sleep 3
done || true
systemctl restart sshd.service