backmeupscotty

   1 #!/bin/bash
   2
   3 REMOTE_HOST=localhost
   4 REMOTE_BASE=/tmp/backmeupscotty
   5 ARCHIVE_KEEPNBACKUPS=30
   6 ARCHIVE_KEEPNDAYS=30
   7
   8 while getopts ":q" opt; do
   9     case $opt in
  10         q)
  11             exec > /dev/null
  12             ;;
  13     esac
  14 done
  15
  16 function grepbackups {
  17     ssh $REMOTE_HOST "ls $REMOTE_BASE/$1" | grep -E '[0-9]+-[0-9]+'
  18 }
  19
  20 function scottysync {
  21     timestamp=$(date +%s)
  22
  23     echo BACKMEUPSCOTTY: Syncing $1 to $REMOTE_HOST:$REMOTE_BASE/$2 @$timestamp
  24
  25     dir_current=$REMOTE_BASE/$2/current
  26     dir_incomplete=$REMOTE_BASE/$2/incomplete
  27     dir_timestamped=$REMOTE_BASE/$2/$timestamp-$(date -d @$timestamp +%Y%m%d%H%M%S)
  28
  29     if [ -z $3 ]; then
  30         rsync_exclude=""
  31     else
  32         rsync_exclude=$(eval echo --exclude={$3} | tr -d {})
  33     fi
  34
  35     if (ssh $REMOTE_HOST '[ ! -d '$REMOTE_BASE/$2' ]'); then
  36         echo BACKMEUPSCOTTY: Creating destination directory $REMOTE_HOST:$REMOTE_BASE/$2
  37         ssh $REMOTE_HOST "mkdir $REMOTE_BASE/$2"
  38     fi
  39
  40     echo BACKMEUPSCOTTY: Starting rsync
  41     rsync -e ssh \
  42         -v -aHAX --numeric-ids --delete --delete-excluded \
  43         --link-dest=$dir_current \
  44         $rsync_exclude \
  45         $1/ $REMOTE_HOST:$dir_incomplete/
  46
  47     if [ $? -eq 0 ]; then
  48         echo BACKMEUPSCOTTY: Timestamping completed backup and linking to current backup
  49         ssh $REMOTE_HOST \
  50             "mv $dir_incomplete $dir_timestamped && rm -f $dir_current && ln -s $dir_timestamped $dir_current"
  51     fi
  52
  53     while [ $(grepbackups $2 | wc -l) -gt $ARCHIVE_KEEPNBACKUPS ]; do
  54         oldestbackup=$(grepbackups $2 | head -1)
  55         oldestbackuptstamp=$(echo $oldestbackup | cut -d'-' -f1)
  56
  57         if [ $oldestbackuptstamp -lt $(( $(date +%s) - $ARCHIVE_KEEPNDAYS*60*60*24 )) ]; then
  58             echo BACKMEUPSCOTTY: Removing old backup $oldestbackup
  59             ssh $REMOTE_HOST rm -r "$REMOTE_BASE/$2/$oldestbackup"
  60         else
  61             break
  62         fi
  63     done
  64 }