An example pre-push hook script to prevent direct pushing to master excluding the following cases -> All commit logs for the commits to be pushed start with "[ALLOW_MASTER]"

pre-push

#!/bin/bash

# An example hook script to prevent direct pushing to master excluding the following cases
# - All commit logs for the commits to be pushed start with "[ALLOW_MASTER]"
# e.g [ALLOW_MASTER] Fix something

z40=0000000000000000000000000000000000000000

while read local_ref local_sha1 remote_ref remote_sha1
do
  if [ "${remote_ref##refs/heads/}" = "master" ]; then
    if [ "$remote_sha1" = $z40 ]; then
      # New branch, examine all commits
      range="$local_sha1"
    else
      # Update to existing branch, examine new commits
      range="$remote_sha1..$local_sha1"
    fi

    # Check for non-allow-master commits
    commit=`git rev-list --invert-grep --grep '^\[ALLOW_MASTER\]' "$range"`
    if [ -n "$commit" ]; then
      cat << EOT
=============================================================================
Pushing to the commits the master branch is not allowed
if there exists at least 1 commit log that doesn't start with [ALLOW_MASTER]
=============================================================================
EOT
      exit 1
    fi
  fi
done

exit 0

$ curl https://gist.githubusercontent.com/5t111111/7779f7ac2c844c1b5479/raw/7a298ad9c705c146e4586306a126d3f83e480236/pre-push > .git/hooks/pre-push
$ chmod 755 .git/hooks/pre-push