$ git clone -n https://src.fedoraproject.org/rpms/libyaml.git /var/lib/mock/f41-build-side-1-2647742-27311/root/chroot_tmpdir/scmroot/libyaml
Cloning into '/var/lib/mock/f41-build-side-1-2647742-27311/root/chroot_tmpdir/scmroot/libyaml'...
$ git fetch origin d1c17317afc769e7859a835f6560adaaf8b31f91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libyaml
 * [new ref]         d1c17317afc769e7859a835f6560adaaf8b31f91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1c1731 Mark the license in specfile as SPDX