159 lines
3.9 KiB
ReStructuredText
159 lines
3.9 KiB
ReStructuredText
.. post:: 2019.08.10
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:tags: howto,ubuntu,gnu/linux,installation
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:category: gnu/linux
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:author: vladan
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:location: Belgrade
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=========================
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Custom Ubuntu Desktop ISO
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=========================
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Last week I got a task to create an Ubuntu ISO installer that should install
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everything automatically, plus some other requirements listed below. This post
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contains the steps taken to create the Ubuntu 18.04.2 installer according to
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these requirements ...
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* `Only one domain is allowed`_
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* `No print screen functionality`_
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* `No usb memory functionality`_
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* `No access to the filesystem`_
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* `No apps except browser`_
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Set up the build environment
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============================
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.. code-block:: bash
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mkdir disk
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sudo mount -o ubuntu-18.04.2-desktop-amd64.iso disk
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rsync --exclude=/casper/filesystem.squashfs -av disk/ livecd/
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Set up the rootfs
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=================
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Create an nspawn container from the rootfs.
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.. code-block:: bash
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unsquashfs disk/casper/filesystem.squashfs
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sudo systemd-nspawn \
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--directory squashfs-root/ \
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--bind ~/dev/automaticcrm/deb:/opt/deb \
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--bind /etc/resolv.conf /bin/bash
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No print screen functionality
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-----------------------------
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... and other unneeded software.
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Once in the shell, run these commands to remove some extra software and install
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Chrome.
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.. code-block:: bash
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apt-get update
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apt-get -y purge \
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alsa* \
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cups* \
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evince \
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firefox* \
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gedit \
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gnome-screenshot \
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libreoffice* \
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remmina* \
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rhythmbox* \
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thunderbird* \
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usb-creator-common \
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usb-creator-gtk \
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dpkg -i /opt/deb/google-chrome-stable_current_amd64.deb
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Only one domain is allowed
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--------------------------
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To redirect all domains to localhost, except DOMAIN, create the
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file ``/etc/dnsmasq.d/autocrm.conf`` with these lines:
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.. code-block:: ini
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address=/#/127.0.0.1
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server=/DOMAIN/8.8.8.8
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Add this line to /etc/dnsmasq.conf
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.. code-block:: ini
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conf-dir=/etc/dnsmasq.d
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No usb memory functionality
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---------------------------
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.. code-block:: bash
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printf "nblacklist uas\nblacklist usb_storage\n" >> /etc/modprobe.d/blacklist.conf
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No apps except browser
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----------------------
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Override the path for all users.
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Edit the desktop entry in ``/usr/share/xsessions/ubuntu.desktop`` so it starts
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Chrome in fullscreen mode:
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.. code-block:: ini
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[Desktop Entry]
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Name=Ubuntu
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Comment=This session logs you into Ubuntu
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Exec=env GNOME_SHELL_SESSION_MODE=ubuntu /usr/bin/google-chrome --kiosk https://DOMAIN
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Type=Application
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DesktopNames=ubuntu:AutomaticCRM
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X-Ubuntu-Gettext-Domain=gnome-session-3.0
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No access to the filesystem
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---------------------------
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Chrome opens in kiosk mode right after login, so there's no access to anything
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whatsoever.
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Create the ISO
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==============
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Pack the squashfs image and copy it to casper.
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.. code-block:: bash
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sudo mksquashfs squashfs-root/ livecd/casper/filesystem.squashfs
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Recreate installation files and pack the ISO.
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.. code-block:: bash
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printf $(sudo du -sx --block-size=1 squashfs-root | cut -f1) > livecd/casper/filesystem.size
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sudo systemd-nspawn --directory squashfs-root/ dpkg-query -W --showformat='${Package} ${Version}\n' > livecd/casper/filesystem.manifest
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sudo cp livecd/casper/filesystem.manifest{,-desktop}
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sudo rm livecd/md5sum.txt && sudo find livecd/ -type f -print0 | sudo xargs -0 md5sum | grep -v isolinux/boot.cat | sudo tee livecd/md5sum.txt
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mkisofs -r \
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-V "AutomaticCRM Ubuntu Linux" \
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-cache-inodes \
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-J -l -b isolinux/isolinux.bin \
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-c isolinux/boot.cat -no-emul-boot \
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-boot-load-size 4 \
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-boot-info-table \
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-o automaticcrm-ubuntu-18.04.2.iso livecd/
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Test the installation in a vm
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=============================
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.. code-block:: bash
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rm -f ubuntu.qcow2
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qemu-img create -f qcow2 ubuntu.qcow2 40G
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virsh define ./autocrm.xml && virsh start ubuntu18.04
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