pre-push hook to block force-pushing to certain branches on Git for Windows MSYS bash

pre-push.git-msys

#!/bin/sh

# based on https://gist.github.com/stefansundin/d465f1e331fc5c632088#file-pre-push

BRANCH=`git rev-parse --abbrev-ref HEAD`

# customization for cygwin/msys
PID=`ps | grep ' /cmd/git$' | sort -n | tail -n 1 | tr -s ' ' | cut -d ' ' -f 2`
PUSH_COMMAND=`cat /proc/$PID/cmdline | tr '\000' ' '`

if [[ "$BRANCH" =~ main|master && "$PUSH_COMMAND" =~ force|delete|-f ]]; then
  echo
  echo "Prevented force-push to $BRANCH. This is a very dangerous command."
  echo "If you really want to do this, use --no-verify to bypass this pre-push hook."
  echo
  exit 1
fi