$ git clone -n https://src.fedoraproject.org/rpms/golang-github-distribution-reference.git /var/lib/mock/f45-build-11871-435/root/chroot_tmpdir/scmroot/golang-github-distribution-reference
Cloning into '/var/lib/mock/f45-build-11871-435/root/chroot_tmpdir/scmroot/golang-github-distribution-reference'...
$ git fetch origin 4f3d23868282a651848ed315ba09ed58758afd2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-distribution-reference
 * [new ref]         4f3d23868282a651848ed315ba09ed58758afd2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f3d238 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild