如何在gitlab服务器端预接收钩子中获取提交消息

Question

I am trying to develop a server side pre-receive hook on gitlab. where I should get the commit message from the new commits which are getting added.

I tried using the git log --pretty=%B -n 1 . This is returning the old committed message. How can I get the commit message form the new unaccepted changes ?

When I tried to get the refname or argument in to the script it did not hold any values. (thinking that might be of help)

#!/bin/bash
ref_name=$refname
echo $ref_name
ref_name=$1
echo $ref_name
echo "refname"
issue=`git log --pretty=%B -n 1`
echo $issue #this is printing old commit message

Result:

Counting objects: 3, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 306 bytes | 0 bytes/s, done.
Total 3 (delta 1), reused 0 (delta 0)
remote:
remote:
remote:
remote: refname

Answer 1

The pre-receive hook gets a list of references and their old and new versions on standard input. So you can do something like this:

#!/bin/sh

while read old new ref
do
    # ref deleted; skip
    echo "$new" | grep -qsE '^0+$' && continue

    issue=$(git log --pretty=%B -n 1 "$new")
    echo "issue is $issue"
done

Note that this assumes that you only care about the head commit at the latest ref and that you're okay with doing this for tags as well. If you only want branches, and you want to traverse all the commits, then you can do something like this:

#!/bin/sh

while read old new ref
do
    case $ref in
        refs/heads/*)
            if echo "$new" | grep -qsE '^0+$'
            then
                # ref deleted; skip
                :
            elif echo "$old" | grep -qsE '^0+$'
            then
                # new branch
                # do something with this output
                git log --pretty=%B "$new"
            else
                # update
                # do something with this output
                git log --pretty=%B "$old".."$new"
            fi;;
        *)
            continue;;
    esac
done