Sunday, November 7, 2010

Personal scripts for maintaining OpenDiagnostics Live CD

I am posting my scripts for maintaining my OpenDiagnostics Live CD so others can use them and add on to them as they see fit. Quite a while ago, I posted a fairly long shell script that I used to keep the ClamAV Live CD up-to-date with virus definitions, but the OpenDiagnostics Live CD is more comprehensive and a single script didn't make sense in my mind. If someone wants to modify them to locally update and modify a custom distro, feel free to take the scripts and edit them as you wish. If you come up with anything particularly neat, feel free to send me the code!

It is relatively easy to setup the project folder. The 'chroot' folder is just the filesystem.squashfs unsquashed. You can mount the ISO (
mount -o loop image.iso tmp/
) to create the image folder (just copy the contents of tmp/ to image/).

And without further ado, here are the scripts I use, in order from first-used to last-used:


sudo cp /etc/hosts chroot/etc/hosts
sudo cp /etc/resolv.conf chroot/etc/resolv.conf
#sudo cp /etc/apt/sources.list chroot/etc/apt/sources.list

sudo chroot chroot mount -t proc none /proc
sudo chroot chroot mount -t sysfs none /sys
sudo chroot chroot mount -t devpts none /dev/pts
sudo chroot chroot export HOME=/root
sudo chroot chroot export LC_ALL=C

sudo chroot chroot

After chrooting, you can do what you wish with the chroot, install any apps you wants, modify or uninstall apps, etc... -- clean up the chroot before remastering. This is run after modifying the chroot.


sudo chroot chroot apt-get clean

sudo chroot chroot rm -rf /tmp/*

sudo chroot chroot rm /etc/resolv.conf

sudo chroot chroot umount -lf /proc
sudo chroot chroot umount -lf /sys
sudo chroot chroot umount -lf /dev/pts -- Create a beta iso that you can test to make sure all your changes made were successful.


sudo chroot chroot dpkg-query -W --showformat='${Package} ${Version}\n' | tee image/casper/filesystem.manifest

sudo cp -v image/casper/filesystem.manifest image/casper/filesystem.manifest-desktop
REMOVE='ubiquity casper live-initramfs user-setup discover1 xresprobe os-prober libdebian-installer4'

for i in $REMOVE
sudo sed -i "/${i}/d" image/casper/filesystem.manifest-desktop

sudo rm image/casper/filesystem.squashfs
sudo mksquashfs chroot image/casper/filesystem.squashfs -e boot

sudo rm image/casper/filesystem.size
sudo printf $(sudo du -sx --block-size=1 chroot | cut -f1) > image/casper/filesystem.size

(cd image && find . -type f -print0 | xargs -0 md5sum | grep -v "\./md5sum.txt" > md5sum.txt)

cd image

sudo rm ../OpenDiagnostics_beta.iso
sudo mkisofs -r -V "OpenDiagnostics Live CD" -cache-inodes -J -l -b isolinux/isolinux.bin -c isolinux/ -no-emul-boot -boot-load-size 4 -boot-info-table -o ../OpenDiagnostics_beta.iso .

cd .. -- Finally, move your changes to stable and zip up the ISO for uploading.


rm OpenDiagnostics_stable.iso
mv OpenDiagnostics_beta.iso OpenDiagnostics_stable.iso
zip OpenDiagnostics_stable.iso

It would be pretty easy to setup a cron to automagically update your chroot and remaster the ISO every week, month, whatever. Hope this helps.

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