MatrixSynapse/.circleci/merge_base_branch.sh

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#!/usr/bin/env bash
set -e
# CircleCI doesn't give CIRCLE_PR_NUMBER in the environment for non-forked PRs. Wonderful.
# In this case, we just need to do some ~shell magic~ to strip it out of the PULL_REQUEST URL.
echo 'export CIRCLE_PR_NUMBER="${CIRCLE_PR_NUMBER:-${CIRCLE_PULL_REQUEST##*/}}"' >> $BASH_ENV
source $BASH_ENV
if [[ -z "${CIRCLE_PR_NUMBER}" ]]
then
echo "Can't figure out what the PR number is! Assuming merge target is develop."
# It probably hasn't had a PR opened yet. Since all PRs land on develop, we
# can probably assume it's based on it and will be merged into it.
GITBASE="develop"
else
# Get the reference, using the GitHub API
GITBASE=`curl -q https://api.github.com/repos/matrix-org/synapse/pulls/${CIRCLE_PR_NUMBER} | jq -r '.base.ref'`
fi
# Show what we are before
git show -s
# Set up username so it can do a merge
git config --global user.email bot@matrix.org
git config --global user.name "A robot"
# Fetch and merge. If it doesn't work, it will raise due to set -e.
git fetch -u origin $GITBASE
git merge --no-edit origin/$GITBASE
# Show what we are after.
git show -s