backmeupscotty

   1 #!/bin/bash
   2
   3 REMOTE_HOST=localhost
   4 REMOTE_BASE=/tmp/backmeupscotty
   5 ARCHIVE_KEEPNBACKUPS=30
   6 ARCHIVE_KEEPNDAYS=30
   7
   8 if [ $(pidof -x $(basename $0) | wc -w) -gt 2 ]; then
   9     echo BACKMEUPSCOTTY: Another instance of $(basename $0) is already running! >&2
  10     exit 1
  11 fi
  12
  13 while getopts ":q" opt; do
  14     case $opt in
  15         q)
  16             exec > /dev/null
  17             ;;
  18     esac
  19 done
  20
  21 function grepbackups {
  22     ssh $REMOTE_HOST "ls $REMOTE_BASE/$1" | grep -E '[0-9]+-[0-9]+'
  23 }
  24
  25 function scottysync {
  26     timestamp=$(date +%s)
  27
  28     echo BACKMEUPSCOTTY: Syncing $1 to $REMOTE_HOST:$REMOTE_BASE/$2 @$timestamp
  29
  30     dir_current=$REMOTE_BASE/$2/current
  31     dir_incomplete=$REMOTE_BASE/$2/incomplete
  32     dir_timestamped=$REMOTE_BASE/$2/$timestamp-$(date -d @$timestamp +%Y%m%d%H%M%S)
  33
  34     if [ -z $3 ]; then
  35         rsync_exclude=""
  36     else
  37         rsync_exclude=$(eval echo --exclude={$3} | tr -d {})
  38     fi
  39
  40     if (ssh $REMOTE_HOST '[ ! -d '$REMOTE_BASE/$2' ]'); then
  41         echo BACKMEUPSCOTTY: Creating destination directory $REMOTE_HOST:$REMOTE_BASE/$2
  42         ssh $REMOTE_HOST "mkdir $REMOTE_BASE/$2"
  43     fi
  44
  45     if (ssh $REMOTE_HOST '[ -d '$REMOTE_BASE/$2/incomplete' ]'); then
  46         echo BACKMEUPSCOTTY: Continuing old incomplete backup >&2
  47     fi
  48
  49     echo BACKMEUPSCOTTY: Starting rsync
  50     rsync -e ssh \
  51         -v -aHAX --numeric-ids --delete --delete-excluded \
  52         --link-dest=$dir_current \
  53         $rsync_exclude \
  54         $1/ $REMOTE_HOST:$dir_incomplete/
  55
  56     if [ $? -eq 0 ]; then
  57         echo BACKMEUPSCOTTY: Timestamping completed backup and linking to current backup
  58         ssh $REMOTE_HOST \
  59             "mv $dir_incomplete $dir_timestamped && rm -f $dir_current && ln -s $dir_timestamped $dir_current"
  60     fi
  61
  62     while [ $(grepbackups $2 | wc -l) -gt $ARCHIVE_KEEPNBACKUPS ]; do
  63         oldestbackup=$(grepbackups $2 | head -1)
  64         oldestbackuptstamp=$(echo $oldestbackup | cut -d'-' -f1)
  65
  66         if [ $oldestbackuptstamp -lt $(( $(date +%s) - $ARCHIVE_KEEPNDAYS*60*60*24 )) ]; then
  67             echo BACKMEUPSCOTTY: Removing old backup $oldestbackup
  68             ssh $REMOTE_HOST rm -r "$REMOTE_BASE/$2/$oldestbackup"
  69         else
  70             break
  71         fi
  72     done
  73 }