update_dockerfiles

#!/bin/bash

# make bash behave
set -euo pipefail
IFS=$'\n\t'

pgversions='11 12 13 14 15 16'
topdir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
dockerfiles_dir="${topdir}/dockerfiles"
templates_dir="${topdir}"/templates

badusage=64

function update_extra_repositories_and_packages {
    os=$1
    release=$2

    extra_repositories=''
    extra_packages=''

    case ${os}+${release} in
        centos+6|centos+7)
            extra_repositories='epel-release centos-release-scl-rh'
            extra_packages='llvm-toolset-7-clang llvm5.0 spectool curl'
            ;;
        centos+8|almalinux+8)
            extra_repositories='epel-release'
            extra_packages='llvm-toolset ccache spectool curl'
            ;;
        oraclelinux+6|oraclelinux+7)
            extra_repositories=''
            extra_packages='llvm-toolset-7-clang llvm5.0 spectool curl'
            ;;
        oraclelinux+8)
            extra_repositories='oracle-epel-release-el8'
            extra_packages='llvm-toolset ccache spectool curl'
            ;;
        # almalinux already has curl installed and installing it again causes conflicting installation error
        almalinux+9)
            extra_repositories='epel-release'
            extra_packages='llvm-toolset ccache rpmdevtools krb5-devel'
            ;;
    esac
}

function update_rpm_dockerfile {
    os=$1
    release=$2
    pgversion=$3

    pgshort=${pgversion//./}
    target_subdir="${dockerfiles_dir}/${os}-${release}-pg${pgshort}"

    if ! [[ "${os}" =~ centos|oraclelinux|almalinux ]]; then
        echo "$0: unrecognized OS -- ${os}" >&2
        exit $badusage
    fi

    rpm_url="download.postgresql.org/pub/repos/yum/reporpms/EL-${release}-x86_64/pgdg-redhat-repo-latest.noarch.rpm"

    mkdir -p "${target_subdir}"

    template="${templates_dir}"/Dockerfile-rpm.tmpl
    sed "$sed_cmd; s#%%rpm_url%%#${rpm_url}#g; s/%%pgshort%%/${pgshort}/g; s/%%pgversion%%/${pgversion}/g" \
        "${template}" > "${target_subdir}/Dockerfile"


}

while read -r line; do
    IFS=',' read -r os release <<< "$line"

    update_extra_repositories_and_packages "${os}" "${release}"

    sed_cmd='s/%%os%%/'"${os}"'/g;
             s/%%release%%/'"${release}"'/g;
             s/%%extra-repositories%%/'"${extra_repositories}"'/g;
             s/%%extra-packages%%/'"${extra_packages}"'/g'

    if [[ "${os}" = 'debian' ]] || [[ "${os}" = 'ubuntu' ]]; then
        # debian variants have a single Dockerfile
        target_subdir="${dockerfiles_dir}/${os}-${release}-all"
        mkdir -p "${target_subdir}"

        template="${templates_dir}"/Dockerfile-deb.tmpl
        sed 's/%%os%%/'"${os}"'/g; s/%%release%%/'"${release}"'/g' \
            "${template}" > "${target_subdir}/Dockerfile"


    elif [[ "${os}" = 'centos' ]]  || [[ "${os}" = 'fedora' ]] || [[ "${os}" = 'oraclelinux' ]] || \
         [[ "${os}" = 'almalinux' ]]; then
        # redhat variants need a Dockerfile for each PostgreSQL version
        IFS=' '
        for pgversion in ${pgversions}; do
            if { [[ "${os}" = 'centos' ]] || [[ "${os}" = 'oraclelinux' ]]; } && \
                 [[ "${release}" = '6' ]] && [[ "${pgversion}" = '13' ]]; then
                # CentOS and OracleLinux 6 doesn't have pg13 packages yet.
                # So skip building docker images for them.
                continue
            fi
            update_rpm_dockerfile "${os}" "${release}" "${pgversion}"
        done
    elif [[ "${os}" = 'pgxn' ]]; then
        # pgxn only needs a single build box
        target_subdir="${dockerfiles_dir}/${os}-all"
        mkdir -p "${target_subdir}"

        template="${templates_dir}"/Dockerfile-pgxn.tmpl
        sed 's/%%os%%/'"${os}"'/g; s/%%release%%/'"${release}"'/g' \
            "${template}" > "${target_subdir}/Dockerfile"


    else
        echo "$0: unrecognized OS -- ${os}" >&2
        exit $badusage
    fi
done <"${topdir}/os-list.csv"