circleciのカスタムビルダーイメージにperlをインストールするやつ

Dockerfile

FROM circleci/build-image:enterprise-base

# Languages
ARG use_precompile=true
ENV USE_PRECOMPILE $use_precompile

ADD circleci-provision-scripts/perl.sh /opt/circleci-provision-scripts/perl.sh
ADD circleci-provision-scripts/circleci-perl-5.24.0_0.0.1_amd64.deb /opt/circleci-provision-scripts/circleci-perl-5.24.0_amd64.deb
RUN circleci-install perl 5.24.0
RUN sudo -H -i -u ubuntu plenv global 5.24.0

perl.sh

#!/bin/bash

function install_plenv() {
    echo '>>> Installing perl'

    apt-get update -y
    apt-get install -y git

    echo 'Installing plenv'
    (cat <<'EOF'
set -ex
git clone https://github.com/tokuhirom/plenv.git $CIRCLECI_PKG_DIR/.plenv
git clone https://github.com/tokuhirom/Perl-Build.git $CIRCLECI_PKG_DIR/.plenv/plugins/perl-build/
echo "export PLENV_ROOT=$CIRCLECI_PKG_DIR/.plenv" >> ~/.circlerc
echo 'export PATH=$PLENV_ROOT/bin:$PATH' >> ~/.circlerc
echo 'eval "$(plenv init -)"' >> ~/.circlerc
EOF
    ) | as_user CIRCLECI_PKG_DIR=$CIRCLECI_PKG_DIR bash

    if [ -n "${USE_PRECOMPILE}" ]; then
    # Preparing for hooking up packaged perl into plenv directories
        (cat <<'EOF'
set -ex
mkdir $CIRCLECI_PKG_DIR/perl
ln -s $CIRCLECI_PKG_DIR/perl $CIRCLECI_PKG_DIR/.plenv/versions
EOF
        ) | as_user CIRCLECI_PKG_DIR=$CIRCLECI_PKG_DIR bash
    fi
}

function install_perl_version_plenv() {
    PERL_VERSION=$1
    (cat <<'EOF'
set -ex
source ~/.circlerc
plenv install $PERL_VERSION
plenv global $PERL_VERSION
plenv rehash
plenv install-cpanm
plenv exec cpanm --notest Carton Server::Starter
EOF
    ) | as_user perl_VERSION=$perl_VERSION bash
}

function install_perl_version_precompile() {
    local PERL_VERSION=$1
    local deb="/opt/circleci-provision-scripts/circleci-perl-${PERL_VERSION}_amd64.deb"

    if [ -f "$deb" ]; then
        dpkg -i /opt/circleci-provision-scripts/circleci-perl-${PERL_VERSION}_amd64.deb
        chown -R $CIRCLECI_USER:$CIRCLECI_USER $CIRCLECI_PKG_DIR/perl
    else
        install_perl_version_plenv $PERL_VERSION
    fi
}

function set_perl_default() {
    local PERL_VERSION=$1
    (cat <<'EOF'
set -ex
source ~/.circlerc
plenv global $PERL_VERSION
plenv rehash
EOF
    ) | as_user PERL_VERSION=$perl_VERSION bash
}

function install_perl_version() {
    local VERSION=$1

    if [ -n "$USE_PRECOMPILE" ]; then
        install_perl_version_precompile $VERSION
    else
        install_perl_version_plenv $VERSION
    fi
}

function install_perl() {
    local VERSION=$1
    [[ -e $CIRCLECI_PKG_DIR/.plenv ]] || install_plenv
    install_perl_version $1
}