$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-yaml-3.git /var/lib/mock/f45-build-12733-443/root/chroot_tmpdir/scmroot/golang-gopkg-yaml-3
Cloning into '/var/lib/mock/f45-build-12733-443/root/chroot_tmpdir/scmroot/golang-gopkg-yaml-3'...
$ git fetch origin 51a155b944c343173db706f47d7a9ed40746ecd3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-yaml-3
 * [new ref]         51a155b944c343173db706f47d7a9ed40746ecd3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51a155b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild