handlers/rdiff

   1 # -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
   2 #
   3 # rdiff-backup handler script for backupninja
   4 # requires rdiff-backup
   5 #
   6
   7 ### FUNCTIONS ###
   8
   9 function test_connection() {
  10         # given a user and host,
  11         # tests the connection.
  12         # if user or host is missing, returns 0
  13         # (ie, assume it's a local connection).
  14         if [ $# -lt 2 ]; then
  15                 debug "(local is assumed to be a good connection)"
  16                 return 0
  17         fi
  18         local user=$1
  19         local host=$2
  20         debug "ssh -o PasswordAuthentication=no $host -l $user 'echo -n 1'"
  21         local ret=`ssh -o PasswordAuthentication=no $host -l $user 'echo -n host is alive'`
  22         if echo $ret | grep "host is alive"; then
  23                 debug "Connected to $host as $user successfully"
  24         else
  25                 fatal "Can't connect to $host as $user."
  26         fi
  27 }
  28
  29 function get_version() {
  30         # given no arguments, returns the local version.
  31         # given a user and host, returns the remote version.
  32         # if user or host is missing, returns the local version.
  33         if [ "$#" -lt 2 ]; then
  34                 debug "$RDIFFBACKUP -V"
  35                 echo `$RDIFFBACKUP -V`
  36         else
  37                 local user=$1
  38                 local host=$2
  39                 debug "ssh $host -l $user '$RDIFFBACKUP -V'"
  40                 echo `ssh $host -l $user "$RDIFFBACKUP -V | grep rdiff-backup"`
  41         fi
  42 }
  43
  44 function check_consistency() {
  45         local section=$1
  46         local type=$2
  47         local user=$3
  48         local host=$4
  49         if [ "$type" == "local" ]; then
  50                 if [ "$user" != "" ]; then
  51                         warning "User should not be specified for local $section."
  52                 fi
  53                 if [ "$host" != "" ]; then
  54                         warning "Host should not be specified for local $section."
  55                 fi
  56         fi
  57         if [ "$type" == "remote" ]; then
  58                 if [ "$user" == "" ]; then
  59                         fatal "User must be specified for remote $section."
  60                 fi
  61                 if [ "host" == "" ]; then
  62                         fatal "Host must be specifed for remote $section."
  63                 fi
  64         fi
  65 }
  66
  67 ### GET CONFIG ###
  68
  69 getconf options
  70 getconf testconnect yes
  71 getconf nicelevel 0
  72
  73 setsection source
  74 getconf type; sourcetype=$type
  75 getconf user; sourceuser=$user
  76 getconf host; sourcehost=$host
  77 check_consistency "source" "$type" "$user" "$host"
  78 getconf label
  79 getconf keep 60
  80 getconf include
  81 getconf vsinclude
  82 getconf exclude
  83
  84 setsection dest
  85 getconf directory; destdir=$directory
  86 # strip trailing /
  87 destdir=${destdir%/}
  88 getconf type; desttype=$type
  89 getconf user; destuser=$user
  90 getconf host; desthost=$host
  91 check_consistency "destination" "$type" "$user" "$host"
  92
  93 ### CHECK CONFIG ###
  94
  95 # See if vservers are configured
  96 local usevserver=no
  97 if [ $vservers_are_available = yes -a -n "$vsinclude" ]; then
  98    info "vserver method enabled"
  99    usevserver=yes
 100 fi
 101
 102 # check the connection at the source and destination
 103 if [ "$testconnect" = "yes" ] || [ "${test}" -eq 1 ]; then
 104         test_connection $sourceuser $sourcehost
 105         test_connection $destuser $desthost
 106 fi
 107
 108 # see that rdiff-backup has the same version at the source and destination
 109 sourceversion=`get_version $sourceuser $sourcehost`
 110 destversion=`get_version $destuser $desthost`
 111 if [ "$sourceversion" != "$destversion" ]; then
 112         fatal "rdiff-backup does not have the same version at the source and at the destination."
 113 fi
 114
 115 # source specific checks
 116 [ "$include" != "" -o "$vsinclude" != "" ] || fatal "No source includes specified"
 117 case $sourcetype in
 118         remote ) execstr_sourcepart="$sourceuser@$sourcehost::/" ;;
 119         local  ) execstr_sourcepart="/" ;;
 120         *      ) fatal "sourcetype '$sourcetype' is neither local nor remote" ;;
 121 esac
 122
 123 # destination specific checks
 124 [ "$destdir" != "" ] || fatal "Destination directory not set"
 125 case $desttype in
 126         remote ) execstr_destpart="$destuser@$desthost::$destdir/$label" ;;
 127         local  ) execstr_destpart="$destdir/$label" ;;
 128         *      ) fatal "desttype '$desttype' is neither local nor remote" ;;
 129 esac
 130
 131 ### REMOVE OLD BACKUPS ###
 132
 133 if [ "`echo $keep | tr -d 0-9`" == "" ]; then
 134         # add D if no other date unit is specified
 135         keep="${keep}D"
 136 fi
 137
 138 removestr="$RDIFFBACKUP --force --remove-older-than $keep "
 139 if [ "$desttype" == "remote" ]; then
 140         removestr="${removestr}${destuser}@${desthost}::"
 141 fi
 142 removestr="${removestr}${destdir}/${label}";
 143
 144 debug "$removestr"
 145 if [ ! $test ]; then
 146         output=`$removestr 2>&1`
 147         if [ $? = 0 ]; then
 148                 debug $output
 149                 info "Removing backups older than $keep days succeeded."
 150         else
 151                 warning $output
 152                 warning "Failed removing backups older than $keep."
 153         fi
 154 fi
 155
 156 ### EXECUTE ###
 157
 158 execstr="$RDIFFBACKUP $options --print-statistics "
 159
 160 # TODO: order the includes and excludes
 161 # excludes
 162 for i in "$exclude"; do
 163         str="${i//__star__/*}"
 164         execstr="${execstr}--exclude '$str' "
 165 done
 166 # includes
 167 for i in "$include"; do
 168         [ "$i" != "/" ] || fatal "Sorry, you cannot use 'include = /'"
 169         str="${i//__star__/*}"
 170         execstr="${execstr}--include '$str' "
 171 done
 172
 173 # vsinclude
 174 if [ $usevserver = yes ]; then
 175    for vserver in $found_vservers; do
 176       for vi in "$vsinclude"; do
 177          str="${vi//__star__/*}"
 178          execstr="${execstr}--include '$VROOTDIR/$vserver$str' "
 179       done
 180    done
 181 fi
 182
 183 # exclude everything else
 184 execstr="${execstr}--exclude '/*' "
 185
 186 # include client-part and server-part
 187 execstr="${execstr}$execstr_sourcepart $execstr_destpart"
 188
 189 debug "$execstr"
 190 if [ ! $test ]; then
 191         output=`nice -n $nicelevel su -c "$execstr" 2>&1`
 192         if [ $? = 0 ]; then
 193                 debug $output
 194                 info "Successfully finished backing up source $label"
 195         else
 196                 warning $output
 197                 warning "Failed backup up source $label"
 198         fi
 199 fi
 200
 201 return 0