$ git clone -n https://src.fedoraproject.org/rpms/golang-rsc-qr.git /var/lib/mock/f45-build-12764-443/root/chroot_tmpdir/scmroot/golang-rsc-qr
Cloning into '/var/lib/mock/f45-build-12764-443/root/chroot_tmpdir/scmroot/golang-rsc-qr'...
$ git fetch origin fb57daa3840868009ce76637f62a4bf692c22a56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-rsc-qr
 * [new ref]         fb57daa3840868009ce76637f62a4bf692c22a56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb57daa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild