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Building live USBs with live-build on Debian

This is my main script for building (two) pen drive images, one without xfce4/lxde and one with:

# From: (find-es "live" "live-build-chrome")

* (eepitch-shell)
* (eepitch-kill)
* (eepitch-shell)
# sudo rm -Rfv /home/live/
mkdire /home/live/
cd     /home/live/

# sudo lb clean --binary
sudo lb clean
sudo lb config \
  --debian-installer-distribution        stretch \
  --distribution                         stretch \
  --parent-distribution                  stretch \
  --parent-debian-installer-distribution stretch

cat > /tmp/my.list.chroot <<'%%%'
emacs24 emacs24-el zsh lua5.1 git make lua-lpeg expect xpdf recode figlet
xinit fvwm
%%%
sudo cp -v /tmp/my.list.chroot \
  /home/live/config/package-lists/my.list.chroot

cd /tmp/
wget -nc https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo cp -v google-chrome*.deb /home/live/config/packages.chroot/

cd     /home/live/
sudo lb build   |& tee build1.log

# (find-fline "/home/live/")
# (find-fline "/home/live/" "live-image-amd64.hybrid.iso")
# (find-fline "/home/live-images/")

laf -h /home/live/
laf -h /home/live-images/
laf -h /home/live/live-image-amd64.hybrid.iso
cp -v  /home/live/live-image-amd64.hybrid.iso \
       /home/live-images/emacs-fvwm-chrome.hybrid.iso



# Make an image adding xfce4 and lxde
#
cat > /tmp/my.list.chroot <<'%%%'
emacs24 emacs24-el zsh lua5.1 git make lua-lpeg expect xpdf recode figlet
xinit fvwm
xfce4 lxde
%%%
sudo cp -v /tmp/my.list.chroot \
   /home/live/config/package-lists/my.list.chroot

cd /home/live/
sudo lb clean
sudo lb build   |& tee build2.log

# (find-fline "/home/live/")
# (find-fline "/home/live/" "live-image-amd64.hybrid.iso")
# (find-fline "/home/live-images/")

laf -h /home/live/
laf -h /home/live-images/
laf -h /home/live/live-image-amd64.hybrid.iso
cp -v  /home/live/live-image-amd64.hybrid.iso \
       /home/live-images/emacs-fvwm-xfce4-lxdm-chrome.hybrid.iso
laf -h /home/live-images/



# Copy the image into the pen drive
# (find-fline "/dev/disk/by-id/")
#
sudo time \
  dd if=/home/live-images/emacs-fvwm-xfce4-lxdm-chrome.hybrid.iso of=/dev/sdb
sync

To make it work I had to install a version of live-build from Sid. See:

# (find-es "live" "live-build-Contents-bug")
# (find-es "live" "live-build-versions")

The pen drive works fine in my neighbor's computer, but I can't boot it in my machine yet - I have a LibreBoot X200 than has LibreBoot instead of a BIOS, and I haven't yet found a way to make its Grub boot a pen drive... my notes about that are here.


A question (that I asked on the #syslinux IRC channel at freenode):

I'm trying to modify a live pen drive with Debian built by live-build to add a third partition to it, but the obvious way - to run fdisk or something similar to it, add another partition, format it, and so on - doesn't work, because fdisk (and gparted, which I also tested) give lots of warnings about the GPT partition table being sort of broken, and if I tell them to go ahead and make the third partition anyway the rest gets corrupted - and when I boot the pen drive I get this: http://angg.twu.net/tmp/live-build-partition-3-bug-2018may29.jpg...

Anyway: I decided to take a blank pen drive, partition it with gparted - with a third partition -, and copy the files from the image produced by live-build to it, and now I have pen drive that has all the files that isohybrid would use... is it possible to run isohybrid on that, make it locate the files that it needs - that are all already on partition 1 - and make isohybrid only write the boot record things?