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<td class="h1"> Backups on CD
<br>
Chapter 3 Details</td>
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<h2><a name="s3.1">3.1 The Burning Process</a></h2>
<p>I think the easiest way to learn about this is to have a look on the source.</p>
<p>If you don't understand how it works please don't email me. Learn more about sh, tar, baseutils and cdrecord.</p>
<p>Assume that tar is invoked as followed:</p>
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<pre>
mkfifo fifo
tar -cpvz -X $excludelist --file=fifo * &
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<h2><a name="s3.2">3.2 <code>toast.sh $params fifo</code></a></h2>
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if test "$1"; then
# > 0?
source $1
else
exit 1
fi
mkdir $toast_dir
let count=tracks
for i in {0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}; do
dd of=$archive.$i bs=1k count=$(expr $tracksize \* 1024)
wait
if ! test -s "$archive.$i" && ! test -e "$toast_dir/$arch_name.*"; then
# file existists but has length of null bytes: finished
rm $archive.$i
$ejectcmd > /dev/null 2>&1
break
else
if test $(expr $i % $count) -eq 0; then
if test $(expr $i) -gt 0; then
$ejectcmd > /dev/null 2>&1
echo -e "\a\nPlease change the disk. Insert volume $(expr $i / $count + 1) and press any key to continue." > /dev/tty
read ans < /dev/tty
fi
let count=tracks
if test -e "$toast_dir/$arch_name.*"; then
# Last CD 'lost' one Track
let count-=1
fi
volid="-V $volume_name$(expr $i / $count + 1)"
vol="-volset $(expr $i / $count + 1)"
touch $toast_dir/"$volume_name$(expr $i / $count + 1)"
blank="-blank=fast"
multiinfo=""
else
volid=""
vol=""
blank=""
let rec=1
while test $rec -ne 0; do
multiinfo="-C $(cdrecord $dev -msinfo) -M $rawdevice" 2>> $logfile
rec=$?
done
fi
mv $archive.$i $toast_dir
if test $(expr $(ls -s $toast_dir/$arch_name.$i | awk '{ print $1 }') / 1024) -lt $tracksize; then
touch $toast_dir/$end_mark
fi
mkimg="mkisofs -r -J"
tsize="$($mkimg -q -print-size $toast_dir 2>&1 | tail -n 1 | awk '{print $NF}')"s
( nice -n -10 $mkimg -L $vol $volid $multiinfo $toast_dir | cdrecord -v $dev $devdepend $blank -multi tsize=$tsize - && rm $toast_dir/* ) 2>> $logfile &
fi
done
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Backups on CD
<br>
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<address>
17 April 2000
<br>
Holger Nassenstein <code><a href="mailto:backups@tuxoncd.de">backups@tuxoncd.de</a></code>
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