Termina

Overview

The project-termina encompasses the majority of functionality for Termina. Architecture-dependent leaf overlays should inherit from this overlay. Currently, these are tatl (x86_64) and tael (arm64).

Packages

chromeos-base/chromeos-bsp-termina

Installs files required for basic VM functionality.

chromeos-base/termina-auth-config

Sets up PAM to allow root/chronos passwordless login. By default this is only installed by target-termina-os-dev, meaning that only dev or test images will get this functionality.

chromeos-base/termina-lxd-scripts

Installs convenience wrapper scripts for setting up the stateful disk image, lxd's initial configuration, and for starting a container with lxd.

virtual/target-os*

These override the normal Chromium OS targets to either no-op (e.g. the factory shim) or depend on the corresponding termina equivalent.

virtual/target-termina-os*

The termina target ebuilds should depend on packages for the appropriate target. Release images will work with just target-termina-os, but developers will likely want to include target-termina-os-dev as well to enable serial console support and allow login.

Building

Termina images are currently repacked from a normal Chromium OS disk image. An example invocation of the repacking script is below.

export BOARD=tatl
./build_packages --board=${BOARD} --nowithautotest
./build_image --board=${BOARD} --noenable_rootfs_verification test
sudo ../platform/container-guest-tools/termina/termina_build_image.py \
  ../build/images/${BOARD}/latest/chromiumos_test_image.bin ${BOARD}

At this point, the output directory will have (among others), the following files:

• vm_kernel - A kernel suitable booting with crosvm.
• vm_rootfs.img - The rootfs for the VM.

Running

Please refer to crosvm documentation on how to run the kernel and rootfs.

These images can also be started with concierge via concierge_client. This mirrors their usage in a production system. To use a custom image with concierge:

# Copy the rootfs and kernel to a working directory on the device, such as
# /usr/local/tatl.
# Then, make this visible to concierge.
mkdir /run/imageloader/cros-termina/99999.0.0
mount --bind /usr/local/tatl /run/imageloader/cros-termina/99999.0.0
restart vm_concierge