How to detect commit --amend by pre-commit hook ?

Question

When I do commit --amend, it is unsafe commit if the commit already has been pushed to remote repository.

I want to detect unsafe commit --amend by pre-commit hook and a

Answer 1

Another way to check if this is an --amend case, in standard shell:

git_command=$(ps -ocommand= -p $PPID)
if [ -z "${git_command##git\ commit*--amend*}" ]; then
    echo "The original command was a: git commit --amend"
    exit 0
fi