gistfile1.txt

#!/bin/bash -u

# lock down remote end? via: 
# https://learninginlinux.wordpress.com/2009/05/07/rsync-fixed-server-side-options/

STOREDIR=/srv/blah/contents
NICE="ionice -c3 nice -n 19"


run_rsync()
{
  # use -vv to gather options for remote server to put in .ssh/authorized_keys
  # that way you can limit rsync to intended use (sender will be fixed)

  $NICE rsync -arHLz --exclude="*/backup/*" --exclude="weblogs" shop.blah.com: .
  return $?
}

loop_rsync()
{

  SYNCED=no
  TRIES=0

  cd $STOREDIR || exit 1

  while [ $SYNCED = "no" ]; do 

    if [ $TRIES -gt 20 ]; then
      echo "Bailing out after 100 incomplete sync attempts"
      break
    fi

    TRIES=$(( $TRIES + 1 ))

    # call the actual sync, return code will be passed back
    run_rsync

    case $? in
        # group return codes by types of issues, see man page
        0|24)
          SYNCED=yes
        ;;
        1|2|3|4|5)
          echo "rsync says we misconfigured it"
          break
        ;;
        # cases where a retry could help
        10|11|12|14|20|23|30)
          continue
        ;;
        19)
          echo "user aborted!"
          exit 1
        ;;
        *)
          echo "unknown issue"
          break
        ;;
    esac
  done

}


loop_rsync