#!/bin/sh

set -eu

umask 027

_date="$(date +%Y-%m-%d)"
_logfile="/srv/log/all.log"

_archivedir="$(dirname "$_logfile")/archive/$(date +%Y)"

if [ -f "$_logfile" ]; then
    if [ ! -s "$_logfile" ]; then
        echo "ERROR: Not rotating empty logfile '${_logfile}'" 1>&2
        exit 1
    fi
else
    echo "ERROR: Cannot find logfile '${_logfile}'" 1>&2
    exit 1
fi

_dest="${_archivedir}/$(basename "$_logfile").${_date}"
[ -d "$_archivedir" ] || mkdir "$_archivedir"

mv "$_logfile" "${_dest}"
touch "$_logfile"

kill -HUP "$(cat /var/run/syslog.pid)"

nice gzip -f "$_dest"