#!/bin/bash
#
# Copyright (C) 2018 JaquerEspeis
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Make a full sync of an Ubuntu mirror.
# This currently requires more than 1TB of storage space and takes a long time.

sleep 1 # prevent cpu spike on looping

export MIRROR_DIR=/var/lib/ubuntumirror
export IPFS_PATH=/var/lib/ipfs


if [[ ! -d $MIRROR_DIR ]]; then
    mkdir -p $MIRROR_DIR
    chown ipfs:ipfs $MIRROR_DIR
fi

chpst -u ipfs /bin/bash << '__EOF__'

export IPFS=/usr/local/bin/ipfs
export HOME=/home/ipfs
export IPFS_FD_MAX=4096

$IPFS config --json Experimental.FilestoreEnabled true

# Two stage sync of the main Ubuntu mirror.
# More info and options in https://wiki.ubuntu.com/Mirrors/Scripts.
echo "Synchronizing with the main Ubuntu mirror, stage 1."
rsync --recursive --times --links --safe-links --hard-links --stats \
    --exclude "Packages*" --exclude "Sources*" --exclude "Release*" \
    --exclude "InRelease" -v \
    rsync://archive.ubuntu.com/ubuntu "$MIRROR_DIR"

echo "Adding the mirror files to IPFS."
hash="$(
    $IPFS add --progress --local --nocopy --fscache --quieter
        --recursive "$MIRROR_DIR" | tail -n1)"
echo "Published IPFS hash ${hash}."

echo "Updating IPNS."
ipns="$($IPFS name publish "${hash}" | cut -d ' ' -f 3 | tr -d ':')"

# FIXME(sneak) use debmirror to improve this in the future
echo "Synchronizing with the main Ubuntu mirror, stage 2."
rsync --recursive --times --links --safe-links --hard-links --stats \
    --delete --delete-after -v \
    rsync://archive.ubuntu.com/ubuntu \
    "$MIRROR_DIR"

# Publish the files on IPFS.
# This uses the experimental filestore:
# https://github.com/ipfs/go-ipfs/issues/3397#issuecomment-284337564
echo "Adding the mirror files to IPFS."
hash="$($IPFS add --progress --local --nocopy --fscache --quieter
--recursive "$MIRROR_DIR" | tail -n1)"
echo "Published IPFS hash ${hash}."

echo "Updating IPNS."
ipns="$($IPFS name publish "${hash}" | cut -d ' ' -f 3 | tr -d ':')"
echo "IPFS Mirror synchronized."
echo "Add the address 'ipfs:/ipns/${ipns}' to your '/etc/apt/sources.list'."
echo "For example, add 'deb ipfs:/ipns/${ipns} xenial main' if you are in Ubuntu 16.04, and you want to use IPFS to get updates from the main archive."
__EOF__

sleep 3600 # wait 1h before syncing again