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     if [ ! -d "$1" ]; then
  31         echo BACKMEUPSCOTTY: Source dir $1 does not exist. Not syncing! >&2
  32         return 1
  33     fi
  34
  35     if [ $(ls -A "$1" | wc -l) -eq 0 ]; then
  36         echo BACKMEUPSCOTTY: Source dir $1 is empty. Not syncing! >&2
  37         return 1
  38     fi
  39
  40     dir_current=$REMOTE_BASE/$2/current
  41     dir_incomplete=$REMOTE_BASE/$2/incomplete
  42     dir_timestamped=$REMOTE_BASE/$2/$timestamp-$(date -d @$timestamp +%Y%m%d%H%M%S)
  43
  44     if [ -z $3 ]; then
  45         rsync_exclude=""
  46     else
  47         rsync_exclude=$(eval echo --exclude={$3} | tr -d {})
  48     fi
  49
  50     if (ssh $REMOTE_HOST '[ ! -d '$REMOTE_BASE/$2' ]'); then
  51         echo BACKMEUPSCOTTY: Creating destination directory $REMOTE_HOST:$REMOTE_BASE/$2
  52         ssh $REMOTE_HOST "mkdir $REMOTE_BASE/$2"
  53     fi
  54
  55     if (ssh $REMOTE_HOST '[ -d '$REMOTE_BASE/$2/incomplete' ]'); then
  56         echo BACKMEUPSCOTTY: Continuing old incomplete backup >&2
  57     fi
  58
  59     echo BACKMEUPSCOTTY: Starting rsync
  60     rsync -e ssh \
  61         -v -aHAX --numeric-ids --delete --delete-excluded \
  62         --link-dest=$dir_current \
  63         $rsync_exclude \
  64         $1/ $REMOTE_HOST:$dir_incomplete/
  65
  66     if [ $? -eq 0 ]; then
  67         echo BACKMEUPSCOTTY: Timestamping completed backup and linking to current backup
  68         ssh $REMOTE_HOST \
  69             "mv $dir_incomplete $dir_timestamped && rm -f $dir_current && ln -s $dir_timestamped $dir_current"
  70     fi
  71
  72     while [ $(grepbackups $2 | wc -l) -gt $ARCHIVE_KEEPNBACKUPS ]; do
  73         oldestbackup=$(grepbackups $2 | head -1)
  74         oldestbackuptstamp=$(echo $oldestbackup | cut -d'-' -f1)
  75
  76         if [ $oldestbackuptstamp -lt $(( $(date +%s) - $ARCHIVE_KEEPNDAYS*60*60*24 )) ]; then
  77             echo BACKMEUPSCOTTY: Removing old backup $oldestbackup
  78             ssh $REMOTE_HOST rm -r "$REMOTE_BASE/$2/$oldestbackup"
  79         else
  80             break
  81         fi
  82     done
  83 }