farlands/buildall.sh

#!/usr/bin/bash

read -r -d '' START << EOM
FROM debian:latest
RUN apt update -y
EOM
read -r -d '' END << EOM
RUN apt-get clean autoclean
RUN apt-get autoremove --yes
RUN rm -rf /var/lib/{apt,dpkg,cache,log}/
RUN useradd -m user
USER user
WORKDIR /home/user
EOM

cd langs

for dir in */
do
    dir="${dir%*/}"

    if podman image exists "$dir-runner"; then
      continue
    fi

    if [ -f "$dir/Dockerfile.user" ]; then
      template_user="$(cat $dir/Dockerfile.user)"
    else
      template_user=""
    fi

    template="$(cat $dir/Dockerfile)"
    run_sh="$(cat $dir/run.sh)"

    echo "#!/usr/bin/bash
if [ \"\$1\" = \"--init\" ]; then
  bash -
fi

$run_sh
" > "Run$dir.sh"

    echo "$START
$template

COPY Run$dir.sh /usr/bin/run
RUN chmod +x /usr/bin/run
RUN chmod 705 /usr/bin/run

$END

$template_user

ENTRYPOINT [\"/usr/bin/run\"]" > Dockerfile

    podman build -t "$dir-runner" .

    rm Dockerfile
    rm "Run$dir.sh"
done

cd ..