#!/bin/sh

set -eu
umask 027

get_vhosts() {
    {
        for hostdir in /srv/weblog/* ; do
            [ -d "$hostdir" ] || continue
            for log in "${hostdir}/"*.access.log ; do
                [ -f "$log" ] || continue
                basename "$log" ".access.log"
            done
        done
    } | sort | uniq
}

print_date() {
    date -r "$(($(date +%s) - $1 * 86400))" "+%Y-%m-%d"
}

get_vhosts | while read -r vhost ; do
    destdir="/srv/weblog/archive/${vhost}"
    [ -d "$destdir" ] || mkdir "$destdir"
    for i in $(seq 0 7); do
        isodate="$(print_date $i)"
        tmpfile="$(mktemp -p "$destdir")"
        trap 'rm -f "$tmpfile"' EXIT
        combine-logs -d "$isodate" \
            /srv/weblog/*/"${vhost}".access.log* | xz -6 > "$tmpfile"
        if [ "$(xzcat "$tmpfile" | cut -c 1)" = "" ]; then
            rm -f "$tmpfile"
            break
        else
            chmod 0640 "$tmpfile"
            mv "$tmpfile" "${destdir}/access.log.${isodate}.xz"
        fi
    done
done