protect master branch

pre-commit

protect_branch() {
    protected_name=$1
    current_name=$(git symbolic-ref HEAD | sed -e "s/^refs\/heads\///")
    if [ "$current_name" = "$protected_name" ]; then
        echo "!!! OH NO! you are trying to change the **$protected_name** branch!!!"
        exit 1
    fi
}
protect_branch master

$ cat pre-commit >> .git/hooks/pre-commit
chmod +x .git/hooks/pre-commit
cat pre-commit >> .git/hooks/pre-push
chmod +x .git/hooks/pre-push

$ git branch
* master
  test
$ git commit -am "test"
!!! OH NO! you are trying to change the **master** branch !!!
$ git checkout test
A   a.tste
Switched to branch 'test'
$ git commit -am "test"
[test 6201659] test
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 a.tste