$ git clone -n https://src.fedoraproject.org/rpms/golang-x-sync.git /var/lib/mock/f45-build-12806-443/root/chroot_tmpdir/scmroot/golang-x-sync
Cloning into '/var/lib/mock/f45-build-12806-443/root/chroot_tmpdir/scmroot/golang-x-sync'...
$ git fetch origin 41c79efaa3a35c0babab3692466f3e390c8b88d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-x-sync
 * [new ref]         41c79efaa3a35c0babab3692466f3e390c8b88d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41c79ef Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild