diskimage-builder/elements/dpkg/pre-install.d/02-add-apt-keys

#!/bin/bash
#
# Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

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

KEY_DIRECTORY=/tmp/apt_keys
if [ ! -d "${KEY_DIRECTORY}" ]; then
    exit 0
fi

for KEY in ${KEY_DIRECTORY}/*; do
    if ! file -b "${KEY}" | grep -q 'PGP public key block'; then
        echo "Skipping ${KEY}, not a valid GPG public key"
        continue
    fi

    apt-key add ${KEY}
done