The default actions/checkout only checks out the merge commit of a
Pull Request. This means that on HEAD is the merge commit, on HEAD^ is the
base branch, and on HEAD^2 are the commits of the Pull Request. Sometimes we
need all the commits of the Pull Request available to us, but the default
fetch-depth only give these three commits.
This action tries in a smart way to fetch the full history of a Pull Request,
by fetching more and more commits till HEAD^ and HEAD^2 have a common parent.
The log between those are all the commits the Pull Request introduce.
First make sure to use actions/checkout to get the repository. Use a
fetch-depth of 4.
This action should be called directly after that.
- uses: openttd/actions/checkout-pull-request@v2