项目越来越大，人员越来越多，代码变动很难通知到每一个项目组成员，尤其是一些核心配置的变动，故此需要在GIT代码库服务端做控制，客户端也可以，但是需要每一个人都在本地进行配置，麻烦亦没必要
核心诉求:
1、限制成员提交代码注释长度
2、核心配置文件修改需要邮件通知到每一个开发人员
要解决第一个诉求用到了GIT的pre-receive钩子，这个钩子会在客户端发起push请求后调用执行，只有执行通过才能合并进代码库，话不多说直接上代码：
```
#!/bin/bash
#pre-receive script
#set -x #for debugging
validate_ref()
{
# --- Arguments
oldrev=$(git rev-parse $1)
newrev=$(git rev-parse $2)
refname="$3"
commitList=`git rev-list $oldrev..$newrev`
#echo $commitList
split=($commitList)
for s in ${split[@]}
do
echo "@@@@@@@"
echo "$s"
msg=`git cat-file commit $s | sed '1,/^$/d'`
echo $msg
if [ ${#msg} -lt 15 ];then
echo "!!! Commit message length less than 15"
exit 1
else
echo "bigger than 5"
fi
done
}
fail=""
# Allow dual mode: run from the command line just like the update hook, or
# if no arguments are given then run as a hook script
if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
# Output to the terminal in command line mode - if someone wanted to
# resend an email; they could redirect the output to sendmail
# themselves
PAGER= validate_ref $2 $3 $1
else
while read oldrev newrev refname
do
validate_ref $oldrev $newrev $refname
done
fi
if [ -n "$fail" ]; then
exit $fail
fi
```
