bin/backup

   1 #!/bin/bash
   2
   3 function log {
   4         conf=`basename $config | sed 's/\.conf$//'`
   5         [ "$dolog" = "1" ] && echo "`date` - $@" >> $logdir/${conf}.log
   6 }
   7
   8 if [ -z "$1" ]; then
   9         echo usage: $0 configfile
  10         exit -1
  11 fi
  12
  13 if [ ! -f $1 ]; then
  14         echo configfile $1 is not a file
  15         exit -2
  16 fi
  17
  18 config=$1
  19
  20 host=`grep ^host $config | cut -d ' ' -f 2`
  21 aliases="`grep ^aliases $config | cut -d ' ' -f 2-`"
  22 user=`grep ^user $config | cut -d ' ' -f 2`
  23 homedirs="` grep ^homedirs $config | cut -d ' ' -f 2-`"
  24 extradirs="`grep ^extradirs $config | cut -d ' ' -f 2-`"
  25 replicas=`grep ^replicas $config | cut -d ' ' -f 2`
  26 oldest=`grep ^oldest $config | cut -d ' ' -f 2`
  27 data=`grep ^data $config | cut -d ' ' -f 2`
  28 bandwidth=`grep ^bandwidth $config | cut -d ' ' -f 2`
  29 bwconn="`grep ^bandwidth $config | cut -d ' ' -f 3-`"
  30 compression=`grep ^compression $config | cut -d ' ' -f 2`
  31 compconn="`grep ^compression $config | cut -d ' ' -f 3-`"
  32 logdir=`grep ^logdir $config | cut -d ' ' -f 2`
  33
  34 dolog=0
  35 if [ ! -z "$logdir" ]; then
  36         mkdir -p $logdir
  37         [ -d $logdir ] && dolog=1
  38 fi
  39
  40 hit=0
  41 for conn in $host $aliases; do
  42         ping -c1 $conn > /dev/null 2>&1
  43         ret=$?
  44         if [ "$ret" = "0" ]; then
  45                 remote=$conn
  46                 break
  47         fi
  48 done
  49 if [ -z "$remote" ]; then
  50         log "host $host ($aliases) unreachable ..."
  51         exit -3
  52 else
  53         log "host $host (via $remote) is online ..."
  54 fi
  55
  56 comp=6
  57 if [ ! -z "$compression" ]; then
  58         comp=$compression
  59         for cpair in "$compconn"; do
  60                 ch=`echo $cpair | cut -d ':' -f 1`
  61                 if [[ "$remote" == "$ch"* ]]; then
  62                         cl=`echo $cpair | cut -d ':' -f 2`
  63                         [[ "$cl" == [0-9] ]] && comp=$cl
  64                 fi
  65         done
  66 fi
  67 rcomp="-z --compress-level $comp"
  68 log using compression level $comp ...
  69
  70 bw=0
  71 if [ ! -z "$bandwidth" ]; then
  72         bw=$bandwidth
  73         for bwpair in "$bwconn"; do
  74                 ch=`echo $bwpair | cut -d ':' -f 1`
  75                 if [[ "$remote" == "$ch"* ]]; then
  76                         bwl=`echo $cpair | cut -d ':' -f 2`
  77                         [ ! -z "$bwl" ]] && bw=$bwl
  78                 fi
  79         done
  80 fi
  81 rbw="--bandwidth=$bw"
  82 log applying bandwidth of $bw ...
  83
  84 if [ ! -d $data ]; then
  85         log no data directory ...
  86         exit -4
  87 fi
  88 log backing up to $data ...
  89
  90 today=`date -I`
  91 backupdir=$data/${user}_at_${host}
  92
  93 cbd=$backupdir/$today
  94 mkdir -p $cbd
  95
  96 rsync="rsync -azR --delete --bwlimit=$bandwidth"
  97
  98 ob=""
  99 lpb=""
 100 for pb in $backupdir/[0-9]*; do
 101         bdd=`basename $pb`
 102         if [ ! -f $backupdir/.$bdd ]; then
 103                 if [ "$pb" != "$cbd" ]; then
 104                         rm -rf $cbd
 105                         mv $pb $cbd
 106                         log continuing $pb as $cbd ...
 107                 else
 108                         if [ ! -z "$lpb" ]; then
 109                                 rm -rf $cbd
 110                                 cp -r $lpb $cbd
 111                                 log "starting backup $today from $lpb ..."
 112                         fi
 113                 fi
 114         fi
 115         lpb=$pb
 116         ob="$ob $pb"
 117 done
 118
 119 if [ ! -f $backupdir/.$today ]; then
 120         rsrc=""
 121         for dir in $homedirs; do
 122                 rsrc="$rsrc :/home/$user/$dir"
 123         done
 124         rsrc="`echo $rsrc | sed 's/^\ //'`"
 125         for dir in $extradirs; do
 126                 rsrc="$rsrc :$dir"
 127         done
 128         [ ! -z "$homedirs" ] && \
 129                 log backing up home directories $homedirs ...
 130         [ ! -z "$extradirs" ] && \
 131                 log backing up directories $extradirs ...
 132         $rsync $user@$remote$rsrc $cbd
 133         ret=$?
 134         if [ "$ret" != "0" ]; then
 135                 log backup terminated before completion ...
 136                 exit -50
 137         fi
 138
 139         touch $backupdir/.$today
 140         log "backup $today completed :)"
 141 else
 142         log backup $bdd found completed ...
 143 fi
 144
 145 [ -z "$replicas" ] && replicas=3
 146 [ -z "$oldest" ] && oldest=0
 147
 148 cob=`echo $ob | wc -w`
 149 if [ $cob -gt $replicas ]; then
 150         ((numdel=cob-replicas))
 151         todel="`echo $ob | cut -d ' ' -f 1-${numdel}`"
 152         for dirdel in $todel; do
 153                 past=`basename $dirdel`
 154                 ns=`date --date="$today" +%s`
 155                 ps=`date --date="$past" +%s`
 156                 ((delta=(ns-ps)/86400))
 157                 if [ $delta -gt $oldest ]; then
 158                         log "deleting $dirdel ($delta days old) ..."
 159                         bdd=`basename $dirdel`
 160                         rm -r $dirdel
 161                         rm $backupdir/.$bdd
 162                 else
 163                         log "keeping $dirdel ($delta days old) ..."
 164                 fi
 165         done
 166 fi
 167
 168 exit 0