Script for checking a remote APT repository

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#!/bin/bash -e

repos[0]='deb http://de.deb.devuan.org/merged ascii main contrib non-free'
repos[1]='deb http://de.deb.devuan.org/merged ascii-security main contrib non-free'
pgpkey[0]='https://git.devuan.org/devuan-packages/devuan-keyring/raw/master/keyrings/devuan-archive-keyring.gpg?inline=false'
pgpkey[1]='https://git.devuan.org/devuan-packages/devuan-keyring/raw/master/keyrings/devuan-archive-keyring.gpg?inline=false'

function cleanup() {
        printf "Cleaning up %s\n" "${tempdir}"
        (
        rmdir "${tempdir}/etc/apt/apt.conf.d"
        rm    "${tempdir}/etc/apt/"*
        rmdir "${tempdir}/etc/apt"
        rmdir "${tempdir}/etc"
        rm    "${tempdir}/state/lists/auxfiles/"*
        rmdir "${tempdir}/state/lists/auxfiles"
        rm    "${tempdir}/state/lists/partial/"*
        rmdir "${tempdir}/state/lists/partial"
        rm    "${tempdir}/state/lists/lock"
        rm    "${tempdir}/state/lists/"*
        rmdir "${tempdir}/state/lists"
        rm    "${tempdir}/cache/"*
        rmdir "${tempdir}/cache"
        rm    "${tempdir}/state/"*
        rmdir "${tempdir}/state"
        ) > /dev/null 2>&1
        rmdir "${tempdir}"
        exit
}
trap cleanup INT QUIT TERM EXIT

tempdir="$(mktemp -d)"

install -d "${tempdir}/state"
install -d "${tempdir}/etc/apt"
install -d "${tempdir}/etc/apt/apt.conf.d"
install -d "${tempdir}/state/lists/partial"
install /dev/null "${tempdir}/etc/apt/trusted.gpg"
install /dev/null "${tempdir}/state/status"

cat > "${tempdir}/etc/apt/apt.conf" <<End
Dir::Etc   "${tempdir}/etc/apt";
Dir::Cache "${tempdir}/cache";
Dir::State "${tempdir}/state";
Dir::State::status "${tempdir}/state/status";
End

for (( index = 0; index < ${#repos[@]}; index++ ))
do 
	echo "${repos[$index]}" >> "${tempdir}/etc/apt/sources.list"
	curl "${pgpkey[$index]}" | 
		gpg --no-default-keyring \
			--keyring "${tempdir}/etc/apt/trusted.gpg" --import
done

export APT_CONFIG="${tempdir}/etc/apt/apt.conf"
apt-get update
apt-cache stats
#printf "\nPackages in repository:\n"
#apt-cache pkgnames | sort
#printf "\n"