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#!/bin/bash
set -eu
# Copyright (C) 2019, IONOS SE
# Author: Benjamin Drung <benjamin.drung@cloud.ionos.com>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# This sudo helper exists, because sudo does not support regular expressions
# and the supported wildcards cannot be secured. Example:
# `/tmp/image-factory/../../etc/shadow` matches `/tmp/image-factory*`
MOUNTDIR=/tmp/image-factory
passed=
if [[ "$*" =~ ^chmod( -R)?\ o[+-]r?w?x?\ ${MOUNTDIR}\.(\.?[A-Za-z0-9_/-]+)*$ ]]; then
passed=yes
elif [[ "$*" =~ ^mount\ /dev/loop[0-9]*\ ${MOUNTDIR}\.[A-Za-z0-9_/-]*$ ]]; then
passed=yes
elif [[ "$*" =~ ^umount\ ${MOUNTDIR}\.[A-Za-z0-9_/-]*$ ]]; then
passed=yes
fi
if test -z "$passed"; then
echo "${0##*/}: Command '$*' not allowed." >&2
exit 1
fi
if test -n "${DRYRUN:-}"; then
echo "${0##*/}: $*"
else
exec "$@"
fi
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