[BUG] Build Python fails due to Zap Generation on Raspberry Pi (no ARM based version of zap-cli available)

[oidebrett]

Reproduction steps

• Clone latest master branch of repo:
• git submodule update --init
• run scripts/build_python.sh -m platform -i separate

Result: FAILED TO EXECUTE ZAP GENERATION

Error suggests:

• You may need to install zap. Please ensure one of these applies:
• • zap-cli is in $PATH. Install from https://github.com/project-chip/zap/releases

There is no compatible version of /zap/releases for ARM based architecture (i.e. Rasp Pi 4B+)

Can ZAP generation be skipped as we only require the python libraries so I can use chip-repl on the Rasp Pi? we would rather not have to download npm etc on the Rasp Pi just to get the ZAP-cli working. There was no previous dependency on zap-cli when running chip-repl previously.

Bug prevalence

When building for Python platform on Raspberry Pi

GitHub hash of the SDK that was being used

master

Platform

raspi

Platform Version(s)

master

Anything else?

No response

[bzbarsky-apple]

@oidebrett You should be able to do the pre-generation thing docs/code_generation.md describes, if the error is clear enough about which exact codegen bits you need.

Can ZAP generation be skipped as we only require the python libraries

Those libraries depend on some generated things, right now.

Also note project-chip/zap#897 but that does not help you for the moment.

[bzbarsky-apple]

And see also #24588 (comment)

[zhouchunli]

same problem

[oidebrett]

I've created a PR to provide a fix for this. Allowing pregenerated files in python build #24752. Hopefully I followed the correct procedures for creating a PR.

[oidebrett]

Just to add that I tested the modified build_python.sh script as follows:

I pre-generated the files on a Ubuntu system that has zap-cli using
scripts/codepregen.py ${OUTPUT_DIRECTORY:-./zzz_pregenerated/}

I then transferred the zzz_pregenerated folder to the raspberry pi and ran
scripts/build_python.sh -m platform -i separate -z ./zzz_pregenerated/

That worked and built the python environment without the need for the zap-cli tool installed on the raspberry pi

[oidebrett]

This can be resolved by building for arm64 eg. for raspberry pi

A new argument has been added to the build_python.sh to allow the use of pre-generated files.

e.g. scripts/build_python.sh -m platform -i separate -z ./zzz_pregenerated/