This repo and its .img.xz output contains only the elements for ASL3 that are used for the installer media of the "turnkey" Pi appliance. In general, any issues with ASL3 should be filed at ASL3 or app_rpt.
Only open an issue with this repository if you have been instructed to do so by an ASL developer or the ASL Helpdesk.
Assembly of the ASL3 Pi Image is done with the build-image script. It's
runnable from any system supported by CustomPiOS by simply running
build-image -v VERSION.
For ASL3 production use, assembly is done through the GitHub Action Assemble Image. Specify the version in the action and then run the assembly job. The assembly is executed on an AWS arm64 Debian 12 instance so that all of the execution does not have to run through the qmeu-arm-static emulator.
One of the SLOWEST parts of the job is compressing back down the image file
with xz. The build-image script is optmized to use xz -T0 which will use
all available cores/threads to compress the file. Thus making the assmebly
faster is literally throwing more CPUs at the process. Currently the
build process is using the m6g.large instance type that other ASL3 builders
are using. However it may be advantageous in the future to choose a different
type of instance.
After the image is assembled, it and its SHA256 hash are copied up to the repo server.