GIT bug: "amend param is not available to pre-commit hook"

From: Andrea Wyss <awyss@lastline.com>
Date: Mar 18, 2020, 14:42 UTC
Message-ID: <CAB8VZwTXVXHOf_WuU9goDaJRCdTnKeeQfL4hYn2PNQjhbYR9=Q@mail.gmail.com>

Issue amend param is not available to pre-commit hook.

Problem Cannot write a pre-commit hook that stops amending a commit that is present in other branches.

Steps to Reproduce (git version 2.21.1 on macOS 10.15.3)
1. In the pre-commit hook:
   echo "DEBUG 0='$0' 1='$1'"

2. run:
   git commit --amend

Result
   DEBUG 0='.git/hooks/pre-commit' 1=''

Expected Result
   DEBUG 0='.git/hooks/pre-commit' 1='--amend'

Please, let me know if you need other information. I'm looking forward for a fix or workaround.

Thank you,

Andrea Wyss Sr Frontend Architect www.lastline.com