#!/bin/bash

DESTPATH="/var/www/mirror/centos/"

RSYNC=/usr/bin/rsync

LOCKFILE=/tmp/rsync-centos.lock

synchronize() {

    $RSYNC -rltvHa --delete-after --delay-updates --safe-links eu-msync.centos.org::CentOS "$DESTPATH"

}

if [ ! -e "$LOCKFILE" ]

then

    echo $$ >"$LOCKFILE"

    synchronize

else

    PID=$(cat "$LOCKFILE")

    if kill -0 "$PID" >&/dev/null

    then

        echo "Rsync - Synchronization still running"

        exit 0

    else

        echo $$ >"$LOCKFILE"

        echo "Warning: previous synchronization appears not to have finished correctly"

        synchronize

    fi

fi

rm -f "$LOCKFILE"