$ git clone -n https://src.fedoraproject.org/rpms/sdl2-compat.git /var/lib/mock/f42-build-side-1-3504328-45983/root/chroot_tmpdir/scmroot/sdl2-compat
Cloning into '/var/lib/mock/f42-build-side-1-3504328-45983/root/chroot_tmpdir/scmroot/sdl2-compat'...
$ git fetch origin 9f8bc167457b5f64273d010150c6f70d1ad6387a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sdl2-compat
 * [new ref]         9f8bc167457b5f64273d010150c6f70d1ad6387a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f8bc16 Add missing files to the file list