$ git clone -n https://src.fedoraproject.org/rpms/rubygem-glut.git /var/lib/mock/f45-build-34946-692/root/chroot_tmpdir/scmroot/rubygem-glut
Cloning into '/var/lib/mock/f45-build-34946-692/root/chroot_tmpdir/scmroot/rubygem-glut'...
$ git fetch origin 969c828df04486c52c6aa046d44be7908b25e66e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-glut
 * [new ref]         969c828df04486c52c6aa046d44be7908b25e66e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 969c828 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild