$ git clone -n https://src.fedoraproject.org/rpms/libXv.git /var/lib/mock/f45-build-15792-479/root/chroot_tmpdir/scmroot/libXv
Cloning into '/var/lib/mock/f45-build-15792-479/root/chroot_tmpdir/scmroot/libXv'...
$ git fetch origin 956307eddd52ca9873165d7c967bfeef8eba1d3d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXv
 * [new ref]         956307eddd52ca9873165d7c967bfeef8eba1d3d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 956307e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild