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This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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By the_gripmaster at 2011-11-14 19:39
This tutorial is about how to verify the integrity of a DV/DVD burned from a ISO. Some CD/DVD burning applications add extra data when burning to the CD/DVD. So, a direct MD5 of the media may give you a misleading result. The trick is to calculate the MD5 of the CD/DVD disregarding the extra data the burning application has written.
#!/usr/bin/env sh
# Purpose: check integrity of a burned DVD with the ISO
if [ $# -ne 1 ]; then
echo "Usage: $0 /path/to/isofile.iso"
exit 1
fi
# the hash application to use, can be other like sha1sum, sha256sum, sha512sum, cksum
HASHAPP='md5sum'
# change if your device is different
DVDDRIVE='/dev/dvd'
# the ISO file
ISOFILE=$1
# check to see if file exists
if ! [ -e ${ISOFILE} ]; then
echo "${ISOFILE} does not exist"
exit 1
fi
hash_of_iso=$(${HASHAPP} ${ISOFILE} | cut -d' ' -f1)
echo "info: ${HASHAPP} of ${ISOFILE} - ${hash_of_iso}"
bytes_of_iso=$(wc --bytes ${ISOFILE})
hash_of_dvd=$(dd if=${DVDDRIVE} | head --bytes ${bytes_of_iso} | ${HASHAPP} | cut -d' ' -f1)
echo "info: ${HASHAPP} of ${DVDDRIVE} - ${hash_of_dvd}"
if [ ${hash_of_iso} == ${hash_of_dvd} ]; then
echo "OK: ${HASHAPP} of ISO(${bytes_of_iso}) matches ${HASHAPP} of DVD(${hash_of_dvd})"
exit 0
else
echo "FAIL: ${HASHAPP} of ISO(${bytes_of_iso}) does not match ${HASHAPP} of DVD(${hash_of_dvd})"
exit 1
fi
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