Check to see if we are on master branch. Stop accidental commits

gistfile1.sh

#!/bin/sh
# Check to see if we are on master branch. Stop accidental commits
if [ $(git symbolic-ref HEAD 2>/dev/null) == "refs/heads/master" ]
then
   if [ -f i_want_to_commit_to_master ]
   then
      rm i_want_to_commit_to_master
      exit 0
   else
      echo "Cannot commit to master branch"
      echo "Remember to create file 'touch i_want_to_commit_to_master' to commit to master"
   fi
   exit 1
fi
exit 0