#get_packages()

print_uris()

{

	[ -n "$APT_CONFIG" ] || Fatal "APT_CONFIG undefined."

	local out

	if ! out="$("$prog_apt_get" -q=2 -y --print-uris install -- "$@" 2>&1)"; then

		printf %s\\n "$out" >&2

		Fatal "failed to calculate package file list."

	fi

    local grep_pattern="^'\\(file\\|copy\\):"

    local filenames

    if ! filenames="$(printf %s "$out" | grep -v "$grep_pattern" | cut -d' ' -f2)"; then

		printf %s\\n "$out" >&2

		Fatal "failed to filter package file list."

    fi

    for f in $filenames; do

        [ -r "/var/cache/apt/archives/$f" ] &&

            cp -- "/var/cache/apt/archives/$f" \

                "$aptbox/var/cache/apt/archives/" &&

            continue

        [ -r "$aptbox/../cache/archives/$f" ] &&

            cp -- "$aptbox/../cache/archives/$f" \

                "$aptbox/var/cache/apt/archives/" &&

            continue

    done

    if ! "$prog_apt_get" -y -d install -- "$@" >&2; then

        printf %s\\n "$out" >&2

        Fatal "failed to download packages."

    fi

    mkdir -p $aptbox/../cache/archives

	local local_uris

	local sed_pattern="'\\(file\\|copy\\):\\([^']\\+\\)' .*"

	if ! local_uris="$(printf %s "$out" |sed -ne "s/^$sed_pattern/\\2/pg")"; then

		printf %s\\n "$out" >&2

		Fatal "failed to filter package file list."

	fi

	printf %s\\n "$local_uris" &&

    for f in $filenames; do

        local ff="$aptbox/var/cache/apt/archives/$f"

        cp -- $ff "$aptbox/../cache/archives/"

        printf %s\\n "$ff"

    done && Verbose "packages are ready to install."

}