$ git clone -n https://src.fedoraproject.org/rpms/snakeyaml.git /var/lib/mock/f40-build-2309138-57338/root/chroot_tmpdir/scmroot/snakeyaml
Cloning into '/var/lib/mock/f40-build-2309138-57338/root/chroot_tmpdir/scmroot/snakeyaml'...
$ git fetch origin 8c0e1265061612dd72bbffc99c38a0af243fd2da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/snakeyaml
 * [new ref]         8c0e1265061612dd72bbffc99c38a0af243fd2da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c0e126 Removed source code and updated sources file