$ git clone -n https://src.fedoraproject.org/rpms/rubygem-forwardable-extended.git /var/lib/mock/f45-build-34936-692/root/chroot_tmpdir/scmroot/rubygem-forwardable-extended
Cloning into '/var/lib/mock/f45-build-34936-692/root/chroot_tmpdir/scmroot/rubygem-forwardable-extended'...
$ git fetch origin 5835bb197610d8ed4f4f195668883afc88a04b4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-forwardable-extended
 * [new ref]         5835bb197610d8ed4f4f195668883afc88a04b4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5835bb1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild