Not able to detect branch from Git post-receive hook

I've g开发者_StackOverflowot a post receive hook setup on the remote repo that tries to determine the branch name of the incoming push as follows:

$branch = `git rev-parse --abbrev-ref HEAD`

What i'm finding, though, is that no matter what branch I push from my $branch variable gets set with 'master'.

Any ideas?

The post-receive hook gets the same data as the pre-receive and not as arguments, but from stdin. The following is sent for all refs:

oldRev (space) newRev (space) refName (Line feed)

You could parse out the ref name with this bash script:

while read oldrev newrev ref
do
    echo "$ref"
done

You could also do something like this using bash variable substitution:

read oldrev newrev ref

branchname=${ref#refs/heads/}

git checkout ${branchname}

Magnus' solution didnt work for me, but this did:

#!/bin/bash

echo "determining branch"

if ! [ -t 0 ]; then
  read -a ref
fi

IFS='/' read -ra REF <<< "${ref[2]}"
branch="${REF[2]}"

if [ "master" == "$branch" ]; then
  echo 'master was pushed'
fi

if [ "staging" == "$branch" ]; then
  echo 'staging was pushed'
fi

echo "done"

Both these answers are correct, but I was having trouble getting stdin to the next common function post-receive-email. Here is what I ended up with:

read oldrev newrev ref
echo "$oldrev" "$newrev" "$ref" | . /usr/share/git-core/contrib/hooks/post-receive-email


if [ "refs/heads/qa" == "$ref" ]; then
  # Big Tuna YO!
  wget -q -O - --connect-timeout=2 http://127.0.0.1:3000/hooks/build/qa_now
fi

You need to read the arguments that are being passed to the script. That should have the branch name and new and old revisions and run for each branch pushed