#!/bin/bash
# https://wiki.dovecot.org/Plugins/Zlib

USE_TMP=${USE_TMP:-false}
dir="${1}"
test -d "${dir}" || exit 1
test -d "${dir}/cur" || exit 1

# Trabajar en memoria (si estamos sincronizando al mismo tiempo, dovecot
# empieza a fallar)
${USE_TMP} && mount -t tmpfs none "${dir}/tmp"

# Bloquear el directorio por un rato
/usr/lib/dovecot/maildirlock "${dir}" 3600 > "${dir}/tmp/lock"
test $? -eq 0 || exit 1

du -hd1 "${dir}/cur"
# Solo buscamos en cur porque new ya va a estar comprimido
find "${dir}"/cur -type f \
| grep -v dovecot \
| grep -v "Z$" \
| grep "S=" \
| xargs -r -d "\n" -P 5 compress-mail
du -hd1 "${dir}/cur"

# Matar el lock
cat "${dir}/tmp/lock" | xargs kill
# Desmontar
${USE_TMP} && umount "${dir}/tmp"