#!/bin/sh
set -ef

: "${1:?}" "${2:?}"

w=$(mktemp -d) ; : "${w:?}"

gpg_on() { gpg-batch.sh start ; }
gpg_off() {
    cd /
    gpg-batch.sh stop
    unset GNUPGHOME
    rm -rf "$w"
    exit "${1:-0}"
}

(
    export GNUPGHOME="$w/.gnupg"
    mkdir -m 0700 "${GNUPGHOME}"
    gpg_on

    gpg --import "$1"
    gpg --armor --export > "$w/export"
    cat < "$w/export" > "$2"
    gpg --show-keys "$2"

    gpg_off
) || gpg_off 1