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

Following @perror's answer, I came up with the following:

parent=$(/bin/ps -o ppid -p $PPID | tail -1)
if [ -n "$parent" ]; then
    amended=$(/bin/ps -o command -p $parent | grep -e '--amend')
    if [ -n "$amended" ]; then
        echo "This is an 'amend'"
    fi  
fi