diskimage-builder/diskimage_builder/elements/dpkg/root.d/50-shared-apt-cache

#!/bin/bash

if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

DIB_APT_LOCAL_CACHE=${DIB_APT_LOCAL_CACHE:-1}

if [ $DIB_APT_LOCAL_CACHE = "0" ]; then
    exit 0
fi

apt_cache_dir=$DIB_IMAGE_CACHE/apt/$DISTRO_NAME
if [ ! -d $apt_cache_dir ]; then
    mkdir -p $apt_cache_dir
fi
sudo mount --bind $apt_cache_dir $TARGET_ROOT/var/cache/apt/archives