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#!/bin/bash
#
# Fetches a version of complement which best matches the current build.
#
# The tarball is unpacked into `./complement`.
set -e
mkdir -p complement
# Pick an appropriate version of complement. Depending on whether this is a PR or release,
# etc. we need to use different fallbacks:
#
# 1. First check if there's a similarly named branch (GITHUB_HEAD_REF
# for pull requests, otherwise GITHUB_REF).
# 2. Attempt to use the base branch, e.g. when merging into release-vX.Y
# (GITHUB_BASE_REF for pull requests).
# 3. Use the default complement branch ("HEAD").
for BRANCH_NAME in "$GITHUB_HEAD_REF" "$GITHUB_BASE_REF" "${GITHUB_REF#refs/heads/}" "HEAD"; do
# Skip empty branch names and merge commits.
if [[ -z "$BRANCH_NAME" || $BRANCH_NAME =~ ^refs/pull/.* ]]; then
continue
fi
(wget -O - "https://github.com/matrix-org/complement/archive/$BRANCH_NAME.tar.gz" | tar -xz --strip-components=1 -C complement) && break
done
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