improvement to pre-commit hook

I was expected an env var like:

GIT_DESIRED_COMMIT_MESSAGE

to show up when .git/hooks/pre-commit is run

but as described here, there doesn't appear to be any args to the script and the environment variable isn't there?

https://stackoverflow.com/questions/56205170/retrieving-desired-git-commit-message-in-pre-commit-hook

-alex