Hello,
I've been working on a primitive backup script,
that, using BRU backs up my root partition, and
then other, more dynamic directories under a
different 'file count' to a DAT tape. At least
that's the plan.
Here's a basic layout of the program:
1. mt eof ( to 'append to a tape' )
2. Write "/"
3. Write 'dynamic' directories
4. go back 2 records ( I use mt bsf 2, but that
doesn't work... )
5. Invoke BRU's integrity-checking for "/"
6. Invoke BRU's integrity-checking for 'dynamic' dirs.
After step "2", should I write a file 'mark' with
some mt option?
What's the correct command for going back 2 'files'?
Would it be better if I use SCSI-specific
commands like fss, bss?
Any comments on the script itself? I used so
many 'variables', because the script is easier
adapted to other machines easier that way. Am I
wrong?
Thank you,
Nikita.
P.s. CC'd replies to list are appreciated.
#!/bin/bash
########################################################
# Name: Backup #
# Description: uses BRU to backup the system. Script #
# splits the "/" filesystem, apart from #
# more 'dynamic' parts, which are backed #
# up separately. #
# Author: Nikita S. Imennov #
# <[EMAIL PROTECTED]> #
# Date Started: Fri Feb 19 14:25:23 EST 1999 #
# Last Edit: Fri Feb 19 14:25:49 EST 1999 #
########################################################
## COMMAND-RELATED VARIABLES ##
MT="/bin/mt"
BRU="/bin/bru"
bruArgs="cvvvvBGf"
TAIL="/usr/bin/tail"
tailArgs="-20"
MAIL="/usr/bin/mail"
mailTo="root"
## SETS ##
primarySet=("/") # Primary set, #1
excludeDirs=("/work" "/archives") # Secondary set, #2
## LOG FILES ##
systemLog="/var/log/bruexeclog" # System's account of events
backupLog="/tmp/.backup$$" # Our account of what happened.
## OTHER VARIABLES ##
DEVICE="/dev/nst0" # DON'T CHANGE IT TO A REWINDING DEV!!!
excludeFile="bruxpat.local"
### FUNCTIONS DECLARED FIRST ###
################################################################
# Function: version() #
# Arguments: none #
# Purpose: display vesion info, obtained from CVS's tag #
# #
################################################################
function version()
{
version="\$Id: backup.script,v 1.9 1999/02/21 18:28:57 nimennor Exp $"
echo "$version"
}
################################################################
# Function: usage() #
# Arguments: none #
# Purpose: display elementary help screen #
# #
################################################################
function usage()
{
version
echo "Backup the system, using BRU" >&2
}
################################################################
# Function: creatExclude() #
# Arguments: none #
# Purpose: create $excludeFile (default: excludeFile.local), #
# that is to be used for BRU backup. #
# #
################################################################
function creatExclude()
{
rm -f $excludeFile # remove any previous files
# Create default exclude file
cat > $excludeFile <<\EOBXP
xs */core # No cores
xs core
xs */core
xs ./usr/tmp/* # All tmp directories
xs /usr/tmp/*
xs ./tmp/*
xs /tmp/*
xs /mnt/* # All mounted dirs
xs /proc # Ignore '/proc', just to be safe
zs *.[Zz] # Don't compress already compressed files
zs *.gz
zs *.tgz
EOBXP
# Now, add a 'customised' set of directories to ignore.
for dir in [EMAIL PROTECTED]
do
echo "xs $dir/*" >> $excludeFile
done
# Export the exclude file's location, so that BRU can read it.
BRUXPAT=$excludeFile
export BRUXPAT
}
function backup()
{
#### REAL CODE (tm) STARTS HERE ####
$MT -f $DEVICE eom # rewind to the end of media
creatExclude # create excludes...
# Backup primary set, and hold off on [EMAIL PROTECTED]
$BRU -$bruArgs $DEVICE -X [EMAIL PROTECTED]
### APPEND THE EXCLUDED DIRECTORIES ###
$BRU -$bruArgs $DEVICE [EMAIL PROTECTED]
### REWIND THE TAPE FOR DOUBLE-CHECK ###
$MT -f $DEVICE bsf 2 # THAT's the trick, right here!
# mt rewinds 2 file counts BACK!!!
# alas, it doesn't work!!!
$BRU -if $DEVICE # Check tape's integrity
ERROR1=$?
$BRU -if $DEVICE
ERROR2=$?
$MT -f $DEVICE rewind # Rewind, since we're done.
cat > $backupLog <<\EOBM
The BRU segregated backup finished with the following results:
EOBM
if [ $ERROR1 == 1 ] ; then
echo "CRC Errors were discovered in backup set #1" >> $backupLog
echo "SET #1 contains:" >> $backupLog
for dir in [EMAIL PROTECTED]
do
echo "\t$dir" >> $excludeFile
done
fi
if [ $ERROR2 == 1 ] ; then
echo "CRC Errors were discovered in backup set #2" >> $backupLog
echo "SET #2 contains:" >> $backupLog
for dir in [EMAIL PROTECTED]
do
echo "\t$dir" >> $excludeFile
done
fi
#
# Tail the 'summary' from BRU's system log for completeness
#
$TAIL $tailArgs $systemLog >> $backupLog
#
# Mail the summary to appropriate users
#
$MAIL -s "BRU: Execution report" $mailTo < $backupLog
#
# Remove any by-products
#
rm -f $backupLog
rm -f $excludeFile
exit 0
}
###### READ THE ARGUMENTS, DECIDE WHAT TO DO #####
while getopts "hv" opt; do
case "$opt" in
h) usage; exit 0;;
v) version; exit 0;;
*) echo "No such parameter!" 1>&2 ; exit 2;;
esac
done
echo "Started: `date`"
echo -n "Backing up..."
backup
echo "Done."
