#!/bin/bash

work_dir=$1
arch=$2
offline_mirror_path="/tmp/aur_offline"

# A func to download, build ...
build_aur () {
    old_dir=`pwd`
    package=$1
    # Prep with a build-user:
    useradd -m -G wheel builder
    sed -i 's/# %wheel ALL=(ALL) NO/%wheel ALL=(ALL) NO/' /etc/sudoers

    cd /tmp
    rm -rf ${package} ${package}.tar.gz
    wget "https://aur.archlinux.org/cgit/aur.git/snapshot/${package}.tar.gz"
    tar xvzf "${package}.tar.gz"

    cd ${package}
    build_dir=$(pwd)
    chown -R builder.builder /tmp/${package}
    echo " => Buiilding ${package}"
    su - builder -c "(cd ${build_dir}; makepkg -s --noconfirm)" >/dev/null 2>&1


    echo " => Adding ${package} to local AUR mirror"
    mkdir -p ${offline_mirror_path}
    sh -c "cp *.xz ${offline_mirror_path}/"
    sh -c "repo-add ${offline_mirror_path}/aur_offline.db.tar.gz ${offline_mirror_path}/*.xz"
    if [[ -z $(cat ${old_dir}/packages.both | grep ${package}) ]]; then
    	# TODO: save a copy of ${old_dir}/packages.both ONCE, if it doesn't excist already.
    	#       This in order to revert our AUR changes which will affect a re-build.
        echo " => Adding ${package} to packages.both (from AUR)"
        echo "${package}" >> ${old_dir}/packages.both
    fi

    ## Long term storage inside the ISO? (if we want to install to disk, we need to pass this along)
    # sh -c "mv *.xz ${old_dir}/$2/$1.pkg.tar.xz"

    cd ${old_dir}
    userdel builder
    rm -rf /home/builder
    rm -rf /tmp/${package}
    rm /tmp/${package}.tar.gz
}

echo "Starting to sync upstream changes to offline mirror."
rm -rf /tmp/sync /tmp/local

echo " => Building AUR (Adding packages to packages.both as we go along)"
build_aur "lighttpd2-git"

if [[ -z $(cat ${work_dir}/pacman.conf | grep '\[aur_offline\]') ]]; then
    echo " => Adding offline mirror to the chroot environment"

    echo "[aur_offline]" >> ${work_dir}/pacman.conf
    echo "Server = file:///tmp/aur_offline" >> ${work_dir}/pacman.conf
    echo "SigLevel = Optional TrustAll" >> ${work_dir}/pacman.conf
fi

## Long term storage, if we want to be able to index our newly build files
## while installing down to disk later, we need to index the AUR packages.
#echo " => Adding packages to offline database"
#sh -c "repo-add --new ${work_dir}/${arch}/airootfs/srv/http/archlinux/arch_offline/os/${arch}/arch_offline.db.tar.gz ${work_dir}/${arch}/airootfs/srv/http/archlinux/arch_offline/os/${arch}/*.pkg.tar.xz" >/dev/null 2>&1

pacman --config ${work_dir}/pacman.conf -Sy
pacman -Sy
echo "Done syncing offline mirror."