Subdirectory checkouts with Git sparse-checkout

git-sparse-checkout-for-circleci.sh

#!/bin/bash -e

CIRCLE_WORKING_DIRECTORY="${CIRCLE_WORKING_DIRECTORY/#\~/$HOME}"
[[ ! -d $CIRCLE_WORKING_DIRECTORY ]] && mkdir -p $CIRCLE_WORKING_DIRECTORY
cd $CIRCLE_WORKING_DIRECTORY

git init
git remote add origin $CIRCLE_REPOSITORY_URL
git config core.sparsecheckout true

[[ -n $FILES ]] && echo $FILES | sed 's/,/\n/g' | tee .git/info/sparse-checkout

git fetch --depth=2 origin $CIRCLE_BRANCH
git fetch --depth=1 origin HEAD:refs/remotes/origin/HEAD
git checkout ${CIRCLE_BRANCH:-${CIRCLE_TAG}}