#!/bin/bash
#
# script to do drive mirroring of another machine
# Copyright 2002, David Lane for Egressive Limited, www.egressive.com
#
#
VERSION=0.1
#
# Defaults
#
# default configuration file
DEF_CONF=/etc/egrsync/egrsync.conf
#
# default log file
DEF_LOG=/var/log/egrsync.log
#
# Commands
# the current date
DATE=`date   '+%Y-%m-%d-%a'`
#
# a timestamp for logging purposes
TIMESTAMP=`date  '+%Y-%m-%d %H:%M.%S'`
#
# function to direct a message...
message() {
  echo "$0: $TIMESTAMP $@" >> $LOG
  verbose "$TIMESTAMP $@"
}
#
# insert a blank line into the log and on the console
insert_blank() {
  echo "" >> $LOG
  verbose ""
}
#
# function to direct a message...
verbose() {
  if test $VERBOSE=1 ; then
    echo "$@"
  fi
}
#
# function to perform the rsyncing
do_rsync() {
  build_excludes
  message "performing rsync of $SERVER..."
  for DIR in $DIRS ;
  do
    message "starting $DIR on $SERVER (as $USER) into $BASEDIR..."
    rsync $FLAGS $EXCLUDES $USER@$SERVER:$DIR $BASEDIR >> $LOG 
    message "done with $DIR."
  done
}
#
# build excludes list
build_excludes() {
  message "building excludes"
  for PAT in $EXCLUDE
  do
    EXCLUDES="$EXCLUDES --exclude $PAT"
  done
}
#
#
# control loop, using external arguments
#
# process command line arguments
#
# set some default values, so that we can test if they've
# been set in the configuration file...
VERBOSE=0
CONF=0
LOG=""
#
# set the default mode in case somebody figures out how to get
# past the options below...
MODE=help
#
# cycle through the commandline options
while test $# -ne 0 ; do  # while there are arguments
  case $1 in
    --config|-c)
      shift  # shift from the flag to the value
      verbose "setting configuration file to $1"
      CONF=$1  # record the value
      ;;
    --log|-l)
      shift  # shift from the flag to the value
      verbose "setting log file to $1"
      LOG=$1  # record the value
      ;;
    --verbose|-v)
      VERBOSE=1
      verbose "setting verbosity to true"
      ;;
    #
    # these are the primary (and mutually exclusive) modes
    # of operation for this system...
    --rsync|-r)
      MODE=do_rsync
      verbose "setting mode to $MODE"
      ;;
    --help|-?|?|-h)
      MODE=help
      verbose "setting mode to $MODE"
      ;;
  esac
  shift
done
#
# set the log file appropriately
#
if test -z $LOG ; then
  LOG=$DEF_LOG
fi
#
# read in config info, from the config
# file provided, or, if none is provided
# from the default file...
if test -f $CONF ; then
  . $CONF
  message "reading config file: $CONF"
elif test -f "$DEF_CONF" ; then
  message "reading default config file: $DEF_CONF"
  . "$DEF_CONF"
else
  message "config file $DEF_CONF does not exist!"
  exit 1
fi
#
#  Now actually try to do the job we've been asked to do...
#
case $MODE in
  do_rsync)
    do_rsync
    insert_blank
    ;;
  help)
    echo ""
    echo "$0 version $VERSION, copyright 2002 Egressive Limited, www.egressive.com"
    echo ""	 
    echo "Use rsync to mirror a series of paths (excluding some files if desired)"
    echo ""
    echo "Usage: $0 {-r|-c|-l}"
    echo "-r or --rsync  - rsyncs the directories described in $DEF_CONF - "
    echo "        or the conf file specifed by -c"
    echo "-v or --verbose -  give extra feedback on progress to stdout"
    echo "-c or --config config_filename  -  use an alternate configuration file"
    echo "-l or --log log_filename  -  use an alternate log file"
    echo "-? or --help  -  display this help information"
    echo ""	
    exit 1
    ;;
esac
exit 0