message: Fix branch matching for BuildKite
diff: @@ -25,18 +25,20 @@ clone() {
  # First we check if GITHUB_HEAD_REF is defined,
  # Then we check if BUILDKITE_BRANCH is defined,
  # if it isn't we can assume this is a Netlify build
  -if [ -n ${GITHUB_HEAD_REF+x} ]; then
  - head=$GITHUB_HEAD_REF
  -elif [ -n ${BUILDKITE_BRANCH+x} ]; then
  - head=$BUILDKITE_BRANCH
  -else
  +if [ -z ${BUILDKITE_BRANCH+x} ]; then
  + if [ -z ${GITHUB_HEAD_REF+x} ]; then
  # Netlify doesn't give us info about the fork so we have to get it from GitHub API
  apiEndpoint="https://api.github.com/repos/matrix-org/matrix-react-sdk/pulls/"
  apiEndpoint+=$REVIEW_ID
  head=$(curl $apiEndpoint | jq -r '.head.label')
  + else
  + head=$GITHUB_HEAD_REF
  + fi
  +else
  + head=$BUILDKITE_BRANCH
  fi
  -# If head is set, it will contain on BuilKite either:
  +# If head is set, it will contain on BuildKite either:
  # * "branch" when the author's branch and target branch are in the same repo
  # * "fork:branch" when the author's branch is in their fork or if this is a Netlify build
  # We can split on `:` into an array to check.
  @@ -44,11 +46,16 @@ fi
  # to determine whether the branch is from a fork or not
  BRANCH_ARRAY=(${head//:/ })
  if [[ "${#BRANCH_ARRAY[@]}" == "1" ]]; then
  - if [[ "$GITHUB_REPOSITORY" = "$deforg/$defrepo" ]]; then
  - clone $deforg $defrepo $head
  + if [ -z ${BUILDKITE_BRANCH+x} ]; then
  + if [[ "$GITHUB_REPOSITORY" == "$deforg"* ]]; then
  + clone $deforg $defrepo $GITHUB_HEAD_REF
  else
  - clone $GITHUB_ACTOR $defrepo $head
  + clone $GITHUB_ACTOR $defrepo $GITHUB_HEAD_REF
  fi
  + else
  + clone $deforg $defrepo $BUILDKITE_BRANCH
  + fi
  +
  elif [[ "${#BRANCH_ARRAY[@]}" == "2" ]]; then
  clone ${BRANCH_ARRAY[0]} $defrepo ${BRANCH_ARRAY[1]}
  fi
  