Created
January 11, 2016 14:38
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#!/bin/bash | |
if (( $(id -u) != 0 )); then | |
echo "This script must be run as root" | |
exit 127 | |
fi | |
opt_exit_status=0 | |
write_diff="overlay.diff" | |
while [ "$1" ]; do | |
case $1 in | |
--no-diff) | |
write_diff="" | |
;; | |
--diff) | |
write_diff="$2" | |
shift 1 | |
;; | |
--no-*) | |
var="${1##--no-}" | |
var="opt_${var//-/_}" | |
if [[ ${!var} ]]; then | |
eval "$var=0" | |
fi | |
;; | |
--*) | |
var="${1##--}" | |
var="opt_${var//-/_}" | |
if [[ ${!var} ]]; then | |
eval "$var=1" | |
fi | |
;; | |
--|*) | |
break | |
;; | |
esac | |
shift 1 | |
done | |
if temp="$( mktemp --directory /tmp/overlay-runner-XXX )"; then | |
trap "rm -rf $temp" EXIT | |
mkdir "$temp/overlay" | |
mkdir "$temp/root" | |
mkdir "$temp/work" | |
mount -t overlayfs -o rw,lowerdir=/,upperdir="$temp/overlay",workdir="$temp/work" overlayfs "$temp/root" | |
chroot "$temp/root" "${@}" | |
exit_code="$?" | |
umount "${temp}/root" | |
DIFF="$(diff -ru "/" "${temp}/overlay" | grep -v ^Only)" | |
if [[ $write_diff ]]; then | |
echo "$DIFF" > "$write_diff" | |
fi | |
if (( $opt_exit_status )); then | |
exit $exit_code | |
elif [[ "$DIFF" == "" ]]; then | |
exit 0 | |
else | |
exit 1 | |
fi | |
else | |
exit 126 | |
fi |
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