apt-mirror scripts that can maintain consistent mirror snapshots. https://lerlacher.de/posts/2017-01-25-working-ubuntu-mirror.html

mirror.sh

#!/bin/bash

echo "apt-mirror start: $(date)"

args=$(getopt -l "initial,config:" -o "i,c:" -- "$@")

eval set -- "$args"

initial=0
config=/etc/apt/mirror.list

while [ $# -ge 1 ]; do
	case "$1" in
		--)
		    # No more options left.
		    shift
		    break
		   ;;
		-i|--initial)
			initial=1
			shift
			;;
		-c|--config)
			config="$2"
			shift
			;;
	esac

	shift
done

if pgrep apt-mirror >/dev/null; then
	killall apt-mirror
	echo "Killed running apt-mirror"

#	echo "Saving state..."
#	name="dist-bak-$(date +%s)"
#	mkdir -p /srv/ubuntumirror/backups/$name
#	cp -r /srv/ubuntumirror/mirror/de.archive.ubuntu.com/ubuntu/dists /srv/ubuntumirror/backups/$name
#	echo "Done, old state saved to /srv/ubuntumirror/backups/$name"

fi
if [[ $initial == 1 ]]; then
	echo "Initial run, removing SUCCESS sentinel"
	[ -e /srv/ubuntumirror/SUCCESS ] && rm /srv/ubuntumirror/SUCCESS
fi

echo "Running apt-mirror from $config"
echo "Running apt-mirror from $config at $(date)" >>/var/log/apt/mirror.cronstderr.log
APTMIRROUT=$(/usr/local/bin/apt-mirror $config 2>>/var/log/apt/mirror.cronstderr.log | tee -a /var/log/apt/mirror.cron.log)

# create snapshot
SNAPSHOTLOC="/srv/ubuntumirror/.zfs/snapshot/$(date +%s)"
echo "Creating snapshot in $SNAPSHOTLOC"
mkdir $SNAPSHOTLOC

echo "apt-mirror finish: $(date)"

if [ -e /srv/ubuntumirror/SUCCESS ]
then
	echo "Success - pointing webserver at snapshot"
	rm /var/www/ubuntu
	ln -s $SNAPSHOTLOC/mirror/de.archive.ubuntu.com/ubuntu /var/www/ubuntu
else
	echo "Fail - check logs" >&2
	echo "$APTMIRROUT" >&2
fi

postmirror.sh

#!/bin/bash

basedir=/srv/ubuntumirror

ret=0
newfiles=$(wc -l $basedir/var/NEW | grep -o '^[0-9]\+')
if [[ "0" == $newfiles && "$1" != "force" ]]
then 
	echo "No new files"
else
	echo "Checking Package list files"
	for i in $basedir/mirror/de.archive.ubuntu.com/ubuntu/dists/*; do
	(
	cd $i
	pmis=$(tail -n +11 Release | egrep '^ [a-z0-9]{32} ' | grep -v -e '-\(powerpc\|sparc\|ia64\|armel\|armhf\|ppc64el\|arm64\|s390x\)\(/\|\.\|$\)' -e '\(Contents\|Components\)-[^.]\+\(\.yml\)\?$' -e '\.tar$' -e '/debian-installer/' -e '/i18n/\(Translation\|Index\)' | awk '{print $1" "$3}' | md5sum -c --quiet 2>&1 )
	pmisfiles=$(echo "$pmis" | sed '/^$/d' | wc -l)
	if [[ "0" == $pmisfiles ]]
	then
		echo "All package list files good in $(basename $i)"
		exit 0
	else
		echo "$pmisfiles Bad package list files in $(basename $i):"
		echo "$pmis"
		exit 1
	fi
	) || ret=1
	done
	cd $basedir/mirror
	newfiles=$(wc -l $basedir/var/NEW | grep -o '^[0-9]\+')
	if [[ "0" == $newfiles ]]
	then
		echo "No new package files"
	else
		mismatch=$(cut -b"8-" $basedir/var/NEW | xargs -I '{}' -n 1 grep -F "{}" $basedir/var/MD5 | md5sum --quiet -c 2>&1 )
		#echo "$mismatch"
		mismatchfiles=$(echo "$mismatch" | sed '/^$/d' | wc -l)
		if [[ "0" == $mismatchfiles ]]
		then
			echo "All $newfiles new package files good"
		else
			echo "$newfiles new package files, but $mismatchfiles bad files:"
			echo "$mismatch"
			ret=1
		fi
	fi
fi
if [[ "0" == $ret ]]; then
	touch /srv/ubuntumirror/SUCCESS
fi
echo "postmirror done at $(date)"
exit $ret