code_style --since doesn't work properly with the framework submodule

[gilles-peskine-arm]

I'm working on a branch forked from mbedtls-3.6 (for example — it could also be development). I run

scripts/code_style.py --since upstream-public/mbedtls-3.6

I expect this to report on the changes made since my branch forked from mbedtls-3.6. But this fails on files in the framework submodule because the script uses the branch name inside the submodule, instead of getting the submodule commit from the toplevel repository's commit.

subprocess.CalledProcessError: Command '['git', '-C', 'framework', 'log', 'upstream-public/mbedtls-3.6..HEAD', '--name-only', '--pretty=', '--', 'psasim/include/psa/client.h', 'psasim/include/psa/error.h', 'psasim/include/psa/lifecycle.h', 'psasim/include/psa/service.h', 'psasim/include/psasim/init.h', 'psasim/src/client.c', 'psasim/src/common.c', 'psasim/src/common.h', 'psasim/src/service.c', 'psasim/test/client.c', 'psasim/test/server.c']' returned non-zero exit status 128.

[ronald-cron-arm]

I think we have already Mbed-TLS/mbedtls-framework#24 to track that issue, thus we probably do not need this additional one.

[gilles-peskine-arm]

Ah, right, sorry, I forgot to check the framework repository since code_style.py is still in the main repo.