#!/bin/bash

# sofar   - 20040201 - generic rsync script usable by mirror sites
# striker - 20040520 - tweaks (ignore, debug) and fixes (rsync detection)
# striker - 20060422 - remove perl regexp requirement on grep -- disables IGNORE


# USAGE: ./rsync-lunar.sh [--debug] [RSYNC OPTIONS]
#
#  (--debug must be first if extra options are specified)

# rules:
# 1) please rsync only once an hour MAXIMUM
# 2) please rsync AFTER HH:20:SS, before that the server may be occupied
#    with rolling out tarballs.
# 3) please inform us that you wll be rsyncing
# 4) please monitor this rsync process, people may want to "depend" on this
#    mirror to be updated. Although we do not advice this, still, it's not
#    nice

#
# the first time you sync you MAY increase the bandwidth usage to 250
# maximum to prevent it from taking forever. Acceptable for normal
# rsyncing is MAXIMUM 50
#
BWLIMIT=250


# the lockfile needs to be in a writeable directory by the user that runs
# this script in his crontab... best make this a separate user, and not
# nobody...
LOCK_FILE="/var/lock/rsync-lunar.lock"


# the mirror location also needs to be writeable
MIRROR_DIR="/home/Mirrors/mirror000/htdocs/"


# this is the rsync URL that points to the lunar rsync repository:
MASTER="lunar-linux.org::lunar/"


# End configuration, begin script...
#########################################################################
#########################################################################

if [ -z "$(pgrep '^rsync$')" ] ; then
  if [ -e $LOCK_FILE ] ; then
    # Stale lockfile
    rm -f $LOCK_FILE
  fi
else
  if [ -e $LOCK_FILE ] ; then
    PID=`cat $LOCK_FILE`
    if [ ! -z "$PID" ] ; then
      if [ ! -d /proc/$PID ] ; then
        # Stale lockfile
        rm -f $LOCK_FILE
      else
        # rsync is running.
        echo "Warning: rsync already running."
        exit
      fi
    fi
  fi
fi

if [[ "$1" == "--debug" ]]; then
  DEBUG=1
  if [ -z "$2" ]; then
    EXTRA=""
  else
    EXTRA=`echo $@ | cut -d\  -f 2-`
  fi
  ARGS="-vvaz --stats ${BWLIMIT:+--bwlimit $BWLIMIT} --progress --stats --delete $EXTRA"
else
  ARGS="-qaz ${BWLIMIT:+--bwlimit $BWLIMIT} --delete $@"
fi

if [ ! -e $LOCK_FILE ] ; then
  if [[ "$DEBUG" == "1" ]]; then
    echo $$ > $LOCK_FILE &&
      rsync $ARGS $MASTER $MIRROR_DIR
  else
    echo $$ > $LOCK_FILE &&
      rsync $ARGS $MASTER $MIRROR_DIR 2>&1| \
        grep -v "^delete_one: *unlink *" | \
          grep -v "some files could not be transferred"
  fi
  rm -f $LOCK_FILE
fi

#########################################################################
#########################################################################
# WHEE!! EOF!