$ git clone -n https://src.fedoraproject.org/rpms/shyaml.git /var/lib/mock/f45-build-35912-700/root/chroot_tmpdir/scmroot/shyaml
Cloning into '/var/lib/mock/f45-build-35912-700/root/chroot_tmpdir/scmroot/shyaml'...
$ git fetch origin e6fbda32715c269ac6ea234f0d02e2e7b96b04d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shyaml
 * [new ref]         e6fbda32715c269ac6ea234f0d02e2e7b96b04d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6fbda3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild