$ git clone -n https://src.fedoraproject.org/rpms/sc-im.git /var/lib/mock/f45-build-35660-698/root/chroot_tmpdir/scmroot/sc-im
Cloning into '/var/lib/mock/f45-build-35660-698/root/chroot_tmpdir/scmroot/sc-im'...
$ git fetch origin 86cbc5f47e29be5af94b3bfc6bb70652e719dd3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sc-im
 * [new ref]         86cbc5f47e29be5af94b3bfc6bb70652e719dd3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86cbc5f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild