$ git clone -n https://src.fedoraproject.org/rpms/flexiblas.git /var/lib/mock/f45-build-9920-411/root/chroot_tmpdir/scmroot/flexiblas
Cloning into '/var/lib/mock/f45-build-9920-411/root/chroot_tmpdir/scmroot/flexiblas'...
$ git fetch origin 954a25c5cd89e44f63277aff8ac7eef4ea15bd82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flexiblas
 * [new ref]         954a25c5cd89e44f63277aff8ac7eef4ea15bd82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 954a25c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild