git中如何对merge行为进行控制

Question

假设git库中有A和B两个分支, 如何设置可以达到下面的效果:
允许B merge into A, 反之则不允许

Answer 1

vi .git/hooks/prepare-commit-msg

#!/bin/sh
case "$2,$3" in
    merge,)
        grep "'A'" $1; 
        if [ $? ];then
            echo '禁止合并A merge into B';
            exit 1;
        fi;;
  *) ;;
esac