post-merge-gist

#!/bin/sh
config_changed="false"
for rev in $(git diff HEAD@{1} HEAD --name-only)
  do
    if [[ $rev =~ "/config/" ]]
    then
      config_changed="true"
    fi
done

if [ "$config_changed" = "true" ]; then
  echo "**************************************************"
  echo "The Config section has changed"
  echo "**************************************************"
fi

This git post-merge hook checks through all the files that have changed after the commit and displays a message at the end if any files within a certain directory have changed.

Useful if you want to keep your eye out for any changes in a directory that shouldn't receive many changes.