$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-retry-1.git /var/lib/mock/f45-build-12661-443/root/chroot_tmpdir/scmroot/golang-gopkg-retry-1
Cloning into '/var/lib/mock/f45-build-12661-443/root/chroot_tmpdir/scmroot/golang-gopkg-retry-1'...
$ git fetch origin b79a533d14385c0f68575b49ae5a98965108d21c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-retry-1
 * [new ref]         b79a533d14385c0f68575b49ae5a98965108d21c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b79a533 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild