#!/bin/bash

###
 # Copyright (C) 2001  Eugenio Diaz <getnito@yahoo.com>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above
 #    copyright notice, this list of conditions and the following
 #    disclaimer in the documentation and/or other materials provided
 #    with the distribution.
 # 3. Neither the name of the University nor the names of its
 #    contributors may be used to endorse or promote products derived
 #    from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS''
 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 # PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS
 # OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 #
 ##
 #
 # This script will make a simple backup of the most critical
 # partitions, using the "dump" facility, into the backup partition.
 #
 # Run the following to make a complete backup:
 #
 # $ su -c "backup full"
 #
 # Run the following to make an incremental backup:
 #
 # $ su -c "backup inc"
 #
 # Add "nodumpdate" to run a backup but not effect the backup state
 # recorded in the file /var/lib/dumpdates and reported by dump -W:
 #
 # $ su -c "backup full nodumpdate"
 #
 ##

if [ "$2" = "nodumpdate" ]; then
   UPDATEDDATE=""
else
   UPDATEDDATE="-u"
fi

if [ "$1" = "full" ]; then
   DLEVEL="0"
   BTYPE="full"
   BACKUP="Full"
elif [ "$1" = "inc" ]; then
   DLEVEL="1"
   BTYPE="inc"
   BACKUP="Incremental"
else
   echo "Usage: $0 full|inc [nodumpdate]"
   exit 1
fi


#
# Configuration Parameters
#

BACKUPPART=${BACKUPPART:-"/backup"}
BACKUPDIR=${BACKUPDIR:-"current"}
DUMPLOGARCH="$BACKUPPART/backup.dump.log.gz"
FSTODUMP=${FSTODUMP:-/ /var /home /mnt/hdb1 /usr}
DUMPFILESMODE="0644"
DUMPFILESOWN="root.root"

#
# Start
#

echo
echo "############################################################"
echo "Starting ${BACKUP} backup"
echo "############################################################"
echo


#
#  Make system backup
#

echo "### ${BACKUP} System Dump Backup ###"
echo "Using backup partition: $BACKUPPART"
echo "Filesystems to dump: $FSTODUMP"

echo -n "Remounting backup partition read-write ... "
if ( mount $BACKUPPART -o remount,rw &> /dev/null ) then
   echo "done."
elif ( mount $BACKUPPART -o rw &> /dev/null ) then
   echo "done."
else
   echo "failure!"
   echo "There were problems remounting $BACKUPPART in read-write mode!"
   echo "Aborting ${BACKUP} System Dump Backup."
   echo "Aborted."
   echo "------------------------------------------------------------"
   exit 1
fi

echo -n "Checking directory structure on backup partition ... "
if [ -d $BACKUPPART/$BACKUPDIR -a -w $BACKUPPART/$BACKUPDIR ]; then
   echo "done."

   echo -n "Checking backup partition for available space ... "
   SREQ=$(for i in $FSTODUMP; do dump -$DLEVEL -S $i 2> /dev/null; done | awk '{x=x+$1/1048576} END {printf "%6.0f\n", x}')
   SAVAILFREE=$(df --block-size=1048576 | grep -Fe $BACKUPPART | awk '{printf "%6.0f\n", $4}')
   SAVAILDEL=$(du -s --block-size=1048576 $BACKUPPART/$BACKUPDIR/. | awk '{printf "%6.0f\n", $1}')
   SAVAIL=$(( $SAVAILFREE + $SAVAILDEL ))

   if [ "$(( $SAVAIL - $SREQ ))" -gt "0" ]; then
      echo "done."
      echo "Available: $SAVAIL MB Required: $SREQ MB."
   else
      echo "not enough space!"
      echo "There is not enough space left in $BACKUPPART for the backup!"
      echo "Available: $SAVAIL MB Required: $SREQ MB."
      echo -n "Remounting backup partition read-only ... "
      if ( mount $BACKUPPART -o remount,ro &> /dev/null ) then
         echo "done."
      elif ( mount $BACKUPPART -o ro &> /dev/null ) then
         echo "done."
      else
         echo "failure!"
         echo "There were problems remounting $BACKUPPART in read-only mode!"
         echo "Aborting ${BACKUP} System Dump Backup."
         echo "Aborted."
         echo "------------------------------------------------------------"
         exit 1
      fi
      echo "Aborting ${BACKUP} System Dump Backup."
      echo "Aborted."
      echo "------------------------------------------------------------"
      exit 1
   fi

   echo -n "Deleting old files ... "
   if [ "$(ls -la $BACKUPPART/$BACKUPDIR/ | wc -l)" -gt "3" ]; then
      rm -f $BACKUPPART/$BACKUPDIR/* &> /dev/null
      echo "done."
   else
      echo "no old files to delete."
   fi

   echo "Dumping filesystems ... "
   for FS in $FSTODUMP
   do
      if [ "$FS" = "/" ]; then
         FSNAME="root"
      else
         FSNAME="$(echo $FS | tr / _ | cut -b 2-)"
      fi
      sync
      TODAY="$(date +%a%Y%m%d)"
      echo -n "Starting dump of $FSNAME ( $FS ) ... "
      if ( dump -$DLEVEL $UPDATEDDATE -z -M -s 27306 -f $BACKUPPART/$BACKUPDIR/$FSNAME.$BTYPE. -Q $BACKUPPART/$BACKUPDIR/$FSNAME.$BTYPE.qfa -L ${TODAY}file $FS &> $BACKUPPART/$BACKUPDIR/$FSNAME.log ) then
         echo "done."
      else
         echo "problems!"
         echo "There were problems with the dump of $FSNAME ( $FS )."
         echo "Check log file at $BACKUPPART/$BACKUPDIR/$FSNAME.log.gz"
         echo "Also check log archive file $DUMPLOGARCH."
      fi

      echo -n "Verifying dump of $FSNAME ( $FS ) ... "
      echo "------------------------------------------------------------" >> $BACKUPPART/$BACKUPDIR/$FSNAME.log
      echo "Result of dump for $FSNAME ( $FS ):" >> $BACKUPPART/$BACKUPDIR/$FSNAME.log
      if ( restore -C -M -f $BACKUPPART/$BACKUPDIR/$FSNAME.$BTYPE. >> $BACKUPPART/$BACKUPDIR/$FSNAME.log 2>&1 ) then
         echo "done."
      else
         echo "problems!"
         echo "There were problems verifying the dump of $FSNAME ( $FS )."
         echo "Check log file $BACKUPPART/$BACKUPDIR/$FSNAME.log.gz for more info"
      fi
      gzip < $BACKUPPART/$BACKUPDIR/$FSNAME.log >> $DUMPLOGARCH
      echo "------------------------------------------------------------" | gzip >> $DUMPLOGARCH
   done

   echo -n "Setting ownership and permissions of dump files ... "
   chmod $DUMPFILESMODE $BACKUPPART/$BACKUPDIR/* $DUMPLOGARCH &> /dev/null
   chown $DUMPFILESOWN $BACKUPPART/$BACKUPDIR/* $DUMPLOGARCH &> /dev/null
   echo "done."

   echo -n "Compressing dump log files ... "
   gzip $BACKUPPART/$BACKUPDIR/*.log &> /dev/null
   echo "done."
   sync

else
   echo "problems!"
   echo "There are problems with the directory structure."
   echo "Check directory: $BACKUPPART/$BACKUPDIR"
   echo -n "Remounting backup partition read-only ... "
   if ( mount $BACKUPPART -o remount,ro &> /dev/null ) then
      echo "done."
   else
      echo "failure!"
      echo "There were problems remounting $BACKUPPART in read-only mode!"
      echo "Aborting ${BACKUP} System Dump Backup."
      echo "Aborted."
      echo "------------------------------------------------------------"
      exit 1
   fi
   echo "Aborting ${BACKUP} System Dump Backup."
   echo "Aborted."
   echo "------------------------------------------------------------"
   exit 1
fi

echo -n "Remounting backup partition read-only ... "
if ( mount $BACKUPPART -o remount,ro &> /dev/null ) then
   echo "done."
else
   echo "failure!"
   echo "There were problems remounting $BACKUPPART in read-only mode!"
   echo "Aborting ${BACKUP} System Dump Backup."
   echo "Aborted."
   echo "------------------------------------------------------------"
   exit 1
fi

echo "### End of ${BACKUP} System Dump Backup ###"
echo "Done."
echo "------------------------------------------------------------"

## end of script