[wplug-plan] Program Suggestion

[Robert Supansic]

The following is a shell-script backup program which I wrote and have been using for the last 
year on my office network and on a client's fileserver.

I do not know whether it is useful to anyone else, represents good programming practice, or 
is the best way to provide a backup function.  I do know that I fhave found it very useful and 
that it works.  From a pedgogical standpoint, it does raise a lot of issues involved with 
backup up and may be a good candidate for a program for that reason.

Look the program over and let me know if I should prepare a talk.

Bob Supansic


!    /bin/bash

#     /backup/backup: performs full and incremental backups

#     Usage: /backup/backup
#            Uses: afio 2.4.6, cdrecord 1.8.1
#            11/26/2001 by r supansic
#            Based on code by Rene Voorburg

#     This program runs every day at 1:00 AM.
#     On Saturdays, full backups are created and written to the CD.
#     On the first Saturday of the month, the linux side is backed
#     up; on all other Saturdays, the data side is backed up.
#     On all other days, incremental backups are created and stored
#     in the /backup directory.


BACKUP_DIR="/backup"
export BACKUP_LOG="$BACKUP_DIR/backup.log"
echo -e "---"$( date ) >> $BACKUP_LOG

BACKUP_FROM_1="/"
BACKUP_TO_1="$BACKUP_DIR/linux"

BACKUP_FROM_2="/win95"
BACKUP_TO_2="$BACKUP_DIR/win95"

BACKUP_FROM_3="/win95/progs"
BACKUP_TO_3="$BACKUP_DIR/win95"

BACKUP_FROM_4="/smb"
BACKUP_TO_4="$BACKUP_DIR/smb"

CDIMAGE="/usr/cd_image/backup"
CD_NAME="CyberDrv"
IMGMOUNT="/mnt"

#     Mounts /dev/hda6 at /backup/linux, if not already mounted.

if [ -z "$( mount | grep $BACKUP_TO_1 )" ]
then
      mount -t vfat /dev/hda6 "$BACKUP_TO_1" 2>>$BACKUP_LOG
fi

#     Backup excludes named directories, removes leading slashes,
#     and compresses files.  Screen output and errors are written to
#     $BACKUP_LOG.

cd /
if [ "$( date +%a )" = "Sat" ]
then


#     Checks for presence of blank CD in drive; if not found, aborts.

      if ! ( /backup/cdcheck )
      then
           echo -e "--No blank CD in drive; full backup aborted."\\n >> $BACKUP_LOG
           cd "$OLDPWD"
           exit
      fi

#     Gets CD device name.

      CDEVICE=$( cdrecord -scanbus | grep "$CD_NAME" | cut -f2 )

#     Creates the image file, creates ext2 filesystem in the image file,
#     and mounts the image file preparatory to writing to it.

      if ! ( dd if=/dev/zero of="$CDIMAGE" bs=1024k count=700 > /dev/null 2>&1 )
      then
           echo "--Exiting: could not create image file." >> $BACKUP_LOG
           cd "$OLDPWD"
           exit 1
      fi
      if ! ( mkfs -t ext2 -b 2048 -F "$CDIMAGE" > /dev/null 2>&1 )
      then
           echo "--Exiting: could not create ext2 filesystem." >> $BACKUP_LOG
           cd "$OLDPWD"
           exit 1
      fi
      if ! ( mount -t ext2 -o loop=/dev/loop1 "$CDIMAGE" "$IMGMOUNT" > /dev/null 2>&1 )
      then
           echo "--Exiting: could not mount image file." >> $BACKUP_LOG
           cd "$OLDPWD"
           exit 1
      fi

      FIRST_SAT=$( cal | grep "  1" | cut -b18- | tr -d " " )
      if [ "$FIRST_SAT" == "$( date +%-d | tr -d " " )" ]
      then

           BACKUP_TYPE="Full afio system backup"
           ARCHIVE_NAME=$IMGMOUNT/$( basename $BACKUP_TO_1 )".afio"
           echo "--$BACKUP_TYPE of linux partition" >> $BACKUP_LOG
           find "$BACKUP_FROM_1" \
                -path /backup -prune -o \
                -path /cdrom -prune -o \
                -path /floppy -prune -o \
                -path /lost+found -prune -o \
                -path /mnt -prune -o \
                -path /proc -prune -o \
                -path /smb -prune -o \
                -path /usr/cd_image -prune -o \
                -path /var/cache/man -prune -o \
                -path /var/lib/dosemu/bootdir.first -prune -o \
                -path /win95 -prune -o \
           -follow \! -type d -print > "$BACKUP_TO_1/flist" 2>/dev/null
           cat "$BACKUP_TO_1/flist" | afio -o -Z "$ARCHIVE_NAME" 2>>$BACKUP_LOG

      else

           BACKUP_TYPE="Full afio data backup"
           ARCHIVE_NAME=$IMGMOUNT/$( basename $BACKUP_TO_2 )".afio"
           echo "--$BACKUP_TYPE of /win95 directories" >> $BACKUP_LOG
           find "$BACKUP_FROM_2" \
                -follow \! -type d -print > "$BACKUP_TO_2/flist" 2>/dev/null
           cat "$BACKUP_TO_2/flist" | afio -o -Z "$ARCHIVE_NAME" 2>>$BACKUP_LOG

           ARCHIVE_NAME=$IMGMOUNT/$( basename $BACKUP_TO_4 )".afio"
           echo "--$BACKUP_TYPE of /smb directories" >> $BACKUP_LOG
           find "$BACKUP_FROM_4" \
                -follow \! -type d -print > "$BACKUP_TO_4/flist" 2>/dev/null
           cat "$BACKUP_TO_4/flist" | afio -o -Z "$ARCHIVE_NAME" 2>>$BACKUP_LOG

      fi

#     Unmounts the image file, burns the CD, and deletes the image file.

      umount "$IMGMOUNT"
      cdrecord -eject speed=4 dev="$CDEVICE" -data "$CDIMAGE" 1>/dev/null 
2>>"$BACKUP_LOG"
      /backup/cdcheck
      rm -f "$CDIMAGE"

else

      if [ "$( date +%a )" = "Sun" ]
      then
           OLD_DATE='-2'
      else
           OLD_DATE='-1' 
      fi
      ARCHIVE_NAME="day"$( date +%d )".afio"
      BACKUP_TYPE="Incremental afio backup"

      echo "--$BACKUP_TYPE of linux partitions" >> $BACKUP_LOG
      find "$BACKUP_FROM_1" \
           -path /backup -prune -o \
           -path /cdrom -prune -o \
           -path /floppy -prune -o \
           -path /lost+found -prune -o \
           -path /mnt -prune -o \
           -path /proc -prune -o \
           -path /smb -prune -o \
           -path /var/cache/man -prune -o \
           -path /var/lib/dosemu/bootdir.first -prune -o \
           -path /win95 -prune -o \
           -mtime "$OLD_DATE" \
           -follow \! -type d -print > "$BACKUP_TO_1/flist" 2>/dev/null
      cat "$BACKUP_TO_1/flist" | afio -o -Z "$BACKUP_TO_1/$ARCHIVE_NAME" 
2>>$BACKUP_LOG

      echo "--$BACKUP_TYPE of /win95/progs directories" >> $BACKUP_LOG
      find "$BACKUP_FROM_3" \
           -mtime "$OLD_DATE" \
           -follow \! -type d -print > "$BACKUP_TO_3/flist" 2>/dev/null
      cat "$BACKUP_TO_3/flist" | afio -o -Z "$BACKUP_TO_3/$ARCHIVE_NAME" 
2>>$BACKUP_LOG

      echo "--$BACKUP_TYPE of /smb directories" >> $BACKUP_LOG
      find "$BACKUP_FROM_4" \
           -mtime "$OLD_DATE" \
           -follow \! -type d -print > "$BACKUP_TO_4/flist" 2>/dev/null
      cat "$BACKUP_TO_4/flist" | afio -o -Z "$BACKUP_TO_4/$ARCHIVE_NAME" 
2>>$BACKUP_LOG

fi

#     Unmounts /backup/linux, if still mounted.

if ! [ -z "$( mount | grep $BACKUP_TO_1 )" ]

then
      umount "$BACKUP_TO_1" 2>>$BACKUP_LOG
fi

#     Log entry written.

LOG_ENTRY=$( date | cut -c11-20 )
echo -e "--All Backups completed $LOG_ENTRY"\\n >> $BACKUP_LOG
cd "$OLDPWD"


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