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#!/bin/bash
# This is a simple mirroring script. To save bandwidth it first checks a
# timestamp via HTTP and only runs rsync when the timestamp differs from the
# local copy. As of 2016, a single rsync run without changes transfers roughly
# 6MiB of data which adds up to roughly 250GiB of traffic per month when rsync
# is run every minute. Performing a simple check via HTTP first can thus save a
# lot of traffic.
# Directory where the repo is stored locally. Example: /srv/repo
target=""
# Directory where files are downloaded to before being moved in place.
# This should be on the same filesystem as $target, but not a subdirectory of $target.
# Example: /srv/tmp
tmp=""
# Lockfile path
lock="/var/lock/syncrepo.lck"
# If you want to limit the bandwidth used by rsync set this.
# Use 0 to disable the limit.
# The default unit is KiB (see man rsync /--bwlimit for more)
bwlimit=0
# The source URL of the mirror you want to sync from.
# If you are a tier 1 mirror use rsync.archlinux.org, for example like this:
# rsync://rsync.archlinux.org/ftp_tier1
# Otherwise chose a tier 1 mirror from this list and use its rsync URL:
# https://www.archlinux.org/mirrors/
source_url=''
# An HTTP(S) URL pointing to the 'lastupdate' file on your chosen mirror.
# If you are a tier 1 mirror use: http://rsync.archlinux.org/lastupdate
# Otherwise use the HTTP(S) URL from your chosen mirror.
lastupdate_url=''
#### END CONFIG
[ ! -d "${target}" ] && mkdir -p "${target}"
[ ! -d "${tmp}" ] && mkdir -p "${tmp}"
exec 9>"${lock}"
flock -n 9 || exit
rsync_cmd() {
local -a cmd=(rsync -rtlH --safe-links --delete-after ${VERBOSE} "--timeout=600" "--contimeout=60" -p \
--delay-updates --no-motd "--temp-dir=${tmp}")
if stty &>/dev/null; then
cmd+=(-h -v --progress)
else
cmd+=(--quiet)
fi
if ((bwlimit>0)); then
cmd+=("--bwlimit=$bwlimit")
fi
"${cmd[@]}" "$@"
}
# if we are called without a tty (cronjob) only run when there are changes
if ! tty -s && [[ -f "$target/lastupdate" ]] && diff -b <(curl -Ls "$lastupdate_url") "$target/lastupdate" >/dev/null; then
# keep lastsync file in sync for statistics generated by the Arch Linux website
rsync_cmd "$source_url/lastsync" "$target/lastsync"
exit 0
fi
rsync_cmd \
--exclude='*.links.tar.gz*' \
--exclude='/other' \
--exclude='/sources' \
--exclude='/iso' \
"${source_url}" \
"${target}"
#echo "Last sync was $(date -d @$(cat ${target}/lastsync))"
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