test-fast-patch-apply.sh

#!/bin/sh

set -e 
set -x

# Demonstrate quickly checking out a sparse and shallow clone of a repo,
# applying a change, and pushing it to a new branch.
#
# Generates a random branch name to avoid collisions.
#
# Runs in 1.5 seconds on my machine.

branch=test-$(openssl rand -base64 24)

cd /tmp
git clone https://github.com/goldmine-build/goldmine.git --no-checkout /tmp/goldmine --depth 1
cd /tmp/goldmine
git sparse-checkout init --cone # to fetch only root files 
git sparse-checkout set perf/modules/alerts-page-sk # etc, to list sub-folders to checkout 
git checkout
git switch -c $branch # or git switch
echo "# test" >> perf/modules/alerts-page-sk/BUILD.bazel
git commit -am "test commit"
git push origin $branch