[git] Prevent commits from default user.

pre-commit

#!/bin/sh

git config user.name >/dev/null && git config user.email >/dev/null
if [ $? -ne 0 ]; then
  cat <<EOF
Error: Attempt to commit by default user.

    $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>

Please set user.name and user.email using following commands.

    git config user.name <YOUR_NAME>
    git config user.email <YOUR_EMAIL>
EOF
  exit 1
fi