$ git clone -n https://src.fedoraproject.org/rpms/gssdp.git /var/lib/mock/f45-build-13084-446/root/chroot_tmpdir/scmroot/gssdp
Cloning into '/var/lib/mock/f45-build-13084-446/root/chroot_tmpdir/scmroot/gssdp'...
$ git fetch origin aba55af8bddc5a8219c361e1a7996835723a4681:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gssdp
 * [new ref]         aba55af8bddc5a8219c361e1a7996835723a4681 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aba55af Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild