#!/bin/bash
#
# mksite-sync-proxy v0.1: update proxy config and reload apache if apropriate
# feedback: rhatto at riseup.net | gpl
#
#  This is free software; you can redistribute it and/or modify it under the
#  terms of the GNU General Public License as published by the Free Software
#  Foundation; either version 2 of the License, or any later version.
#
#  This software 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, write to the Free Software Foundation, Inc., 59 Temple
#  Place - Suite 330, Boston, MA 02111-1307, USA
#

TMP="/tmp"
MKSITE_BASE="/etc/mksite"
CONF="$MKSITE_BASE/mksite.conf"
MESSAGES="/usr/share/mksite/mksite.messages"
LOCKFILE="$TMP/mkproxy.lock"
HELPER_FUNCTIONS="/usr/libexec/mksite/mksite-helper"

# plugin definitions
PLUGIN_NAME="proxy-sync"

if [ -f "$HELPER_FUNCTIONS" ]; then
  source $HELPER_FUNCTIONS
  mksite_checks
else
  echo Fatal error: function file not found, aborting.
  echo Erro fatal: arquivo de funcoes nao encontrado, abortando.
  exit 1
fi

# parametros de configuracao
LOCAL_RSYNC_CMD="`mksite_eval_param $MKSITE_BASE/plugins/$PLUGIN_NAME $LOCAL_RSYNC_CMD`"
REMOT_RSYNC_CMD="`mksite_eval_param $MKSITE_BASE/plugins/$PLUGIN_NAME $REMOTE_RSYNC_CMD`"
REMOTE_INSTANCES="`mksite_eval_param $MKSITE_BASE/plugins/$PLUGIN_NAME $REMOTE_INSTANCES`"
LOCAL_INSTANCES="`mksite_eval_param $MKSITE_BASE/plugins/$PLUGIN_NAME $LOCAL_INSTANCES`"
PROXY_DATA_DIR="`mksite_eval_param $MKSITE_BASE/plugins/$PLUGIN_NAME $DATA_DIR`"

# PROXY_DATA_DIR: checksuns de arquivos
if [ -z "PROXY_DATA_DIR" ]; then
  PROXY_DATA_DIR="/var/mksite/proxy"
fi

if [ ! -d "$PROXY_DATA_DIR" ]; then
  mkdir -p $PROXY_DATA_DIR/{local,remote}
fi

# TODO: sincroniza as definicoes de proxy
#       - rsync remoto: servidor, pasta remota, pasta local, template
#       - rsync local: pasta da instancia, pasta local, template


# TODO: checa modifcoes e caso necessario:
#       - adiciona o host ao /etc/hosts
#       - atualiza o apache
#       - inclui os arquivos no template da jaula correspondente

vars="user server remote_folder local_folder template file filename"

# local servers: /jaula:/pasta:template
if [ ! -z "$LOCAL_INSTANCES" ]; then
  for local_instance in $LOCAL_INSTANCES; do
    unset $vars
    remote_folder="`echo $local_instance | cut -d : -f 1`"
    local_folder="`echo $local_instance | cut -d : -f 2`"
    template="`echo $local_instance | cut -d : -f 3`"

    # checkums guardados em $PROXY_DATA_DIR/local/$template
    if [ ! -d "$PROXY_DATA_DIR/local/$template" ]; then
      mkdir -p $PROXY_DATA_DIR/local/$template
    fi

    # aplica mudancas, caso elas existam
    for file in ls $remote_folder; do
      filename="`basename $file`"
      if [ ! -a "$local_folder/$filename" ] || ! diff $file $local_folder/$filename; then
        # faz o rsync
        $LOCAL_RSYNC_CMD $file/ $local_folder/
        # faz o rsync para o template
        if [ "$USE_SIMPLEPKG" == "yes" ] then
          $LOCAL_RSYNC_CMD $file/ /etc/simplepkg/$template/`$dirname $file`/
        fi
        # TODO: adiciona entradas no /etc/hosts caso necessario
        # reinicia o apache
        break
      fi
    done

  done
fi

# remote servers: usuario@servidor:/pasta:template
if [ ! -z "$REMOTE_INSTANCES" ]; then
  for local_instance in $REMOTE_INSTANCES; do
    unset $vars
    user="`echo $local_instance | cut -d "@" -f 1`"
    remote_folder="`echo $local_instance | cut -d : -f 1 | cut -d "@" -f 2`"
    local_folder="`echo $local_instance | cut -d : -f 2`"
    template="`echo $local_instance | cut -d : -f 3`"

    # checkums guardados em $PROXY_DATA_DIR/local/$template
    if [ ! -d "$PROXY_DATA_DIR/remote/$template" ]; then
      mkdir -p $PROXY_DATA_DIR/remote/$template
    fi

    # syncroniza

    # checa novos arquivos

    # se nao houver novos arquivos

  done
fi