pre-receive

#!/bin/bash
while read oldrev newrev refname
do
    if [[ $refname =~ (hotfixes)|(qa)|(dev) ]] ; then
      echo "ensuring no trivial merges in $refname" >&2
      for hash in $(git log --format=%H --merges $oldrev..$newrev)
        do
          echo "checking $hash" >&2
          if [[  ($refname =~ /qa$ && "$(git log --format=%H ^$hash^2 qa | wc)" == "$(git log --format=%H qa | wc)")
              || ($refname =~ /dev$ && "$(git log --format=%H ^$hash^2 dev | wc)" == "$(git log --format=%H dev | wc)")
              || ($refname =~ /hotfixes$ && "$(git log --format=%H ^$hash^2 hotfixes | wc)" == "$(git log --format=%H hotfixes | wc)") ]]
          then
            echo "Please rebase first, trivial merges are not allowed in $refname." >&2
            exit 1
          fi
        done
    fi
done
exit 0