#!/bin/sh
-PATH=/bin:/usr/bin
+export PATH=$(dirname $0):/bin:/usr/bin:/sbin
-mailto=carl@ecbaldwin.net
-dev="/dev/hdc"
-sdev="ATA:1,0,0"
-imagedir="/backup/imgs"
+cronstopstart="/etc/init.d/cron"
+. config.sh
-# Discover disk images by looking for .img.md5sum files in $imagedir
-imgmd5=$(ls $imagedir/*.img.md5sum | head -n 1)
+# If the noburn file is there then don't burn.
+[ -f "$noburnfile" ] && exit 0
-logfile=$(tempfile)
+# Discover disk images by looking for .img.md5sum files in $imagedir
+imgmd5=$(ls $imagedir/*.img.md5sum 2>/dev/null | head -n 1)
# If we didn't find an non-empty file then exit gracefully
[ -z "$imgmd5" ] && exit 0
[ -s "$imgmd5" ] || exit 0
+logfile=$(tempfile)
+
# Get the name of the disk image by stripping off the tailing '.md5sum'
img=${imgmd5%.md5sum}
+touch $noburnfile
+
# A little paranoia. Make sure the disk image file is there.
[ -z "$img" ] && exit 1
[ -s "$img" ] || exit 1
+# To avoid buffer underruns I'm going to stop cron and renice myself
+$cronstopstart stop
+renice -10 $$
+
# Burn the image to a disk.
-cdrecord-wrapper.sh -dao dev=$sdev $isoimage > $logfile 2>&1
+cdrecord-wrapper.sh -dao dev=$sdev $img > $logfile 2>&1
-if [ 0 != "$?" ]; then
+if [ "0" != "$?" ]; then
echo >&2 "cdrecord failed!"
exit 1
fi
+# We don't need to be high-priority anymore.
+renice 0 $$
+$cronstopstart start
+
# Now verify the disk by running md5sum on the entire contents of the disk
md5sum=$(tempfile)
dd if=$dev bs=1M count=4440 2>$logfile | md5sum | awk '{print$1}' > $md5sum
# Check that the md5sums match
-if ! cmp $md5sum $isoimage.md5sum; then
+if ! cmp $md5sum $img.md5sum; then
echo "Failed" | mailx -s "DVD md5sum doesn't match image file!!!" $mailto
exit 1
fi
cat $img.md5sum
echo
echo "md5sum of burned disks:"
+ cat $md5sum
+ echo
cat $img.stat
echo
cat $logfile
-} | mailx -s "DVD burned. File it as ${img%.*}" $mailto > $logfile 2>&1
+} | mailx -s "DVD burned. File as $(basename ${img%.*})" $mailto > $logfile 2>&1
# Two lines in the stat file indicate two successful burns. Clean-up the image.
-if [ "$(wc -l $img.stat 2>/dev/null)" == "2" ]; then
+if [ "$(wc -l $img.stat 2>/dev/null | awk '{print$1}')" == "2" ]; then
# Burned the image twice. Removing it and associated files!
rm -f $img{,.md5sum,.stat}
[ -d $img.mnt ] && rmdir $img.mnt