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 $lpb ..."
 112                         else
 113                                 log starting backup from scratch ...
 114                         fi
 115                 fi
 116         fi
 117         lpb=$pb
 118         ob="$ob $pb"
 119 done
 120
 121 if [ ! -f $backupdir/.$today ]; then
 122         rsrc=""
 123         for dir in $homedirs; do
 124                 rsrc="$rsrc :/home/$user/$dir"
 125         done
 126         rsrc="`echo $rsrc | sed 's/^\ //'`"
 127         for dir in $extradirs; do
 128                 rsrc="$rsrc :$dir"
 129         done
 130         [ ! -z "$homedirs" ] && \
 131                 log backing up home directories $homedirs ...
 132         [ ! -z "$extradirs" ] && \
 133                 log backing up directories $extradirs ...
 134         $rsync $user@$remote$rsrc $cbd
 135         ret=$?
 136         if [ "$ret" != "0" ]; then
 137                 log backup terminated before completion ...
 138                 exit -50
 139         fi
 140
 141         touch $backupdir/.$today
 142         log "backup $today completed :)"
 143 else
 144         log backup $bdd found completed ...
 145 fi
 146
 147 [ -z "$replicas" ] && replicas=3
 148 [ -z "$oldest" ] && oldest=0
 149
 150 cob=`echo $ob | wc -w`
 151 if [ $cob -gt $replicas ]; then
 152         ((numdel=cob-replicas))
 153         todel="`echo $ob | cut -d ' ' -f 1-${numdel}`"
 154         for dirdel in $todel; do
 155                 past=`basename $dirdel`
 156                 ns=`date --date="$today" +%s`
 157                 ps=`date --date="$past" +%s`
 158                 ((delta=(ns-ps)/86400))
 159                 if [ $delta -gt $oldest ]; then
 160                         log "deleting $dirdel ($delta days old) ..."
 161                         bdd=`basename $dirdel`
 162                         rm -r $dirdel
 163                         rm $backupdir/.$bdd
 164                 else
 165                         log "keeping $dirdel ($delta days old) ..."
 166                 fi
 167         done
 168 fi
 169
 170 exit 0