$ git clone -n https://src.fedoraproject.org/rpms/opencomposite.git /var/lib/mock/f45-build-21000-577/root/chroot_tmpdir/scmroot/opencomposite
Cloning into '/var/lib/mock/f45-build-21000-577/root/chroot_tmpdir/scmroot/opencomposite'...
$ git fetch origin 67eb5b208bdafc65958f5fe6d4cabb664c29191b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opencomposite
 * [new ref]         67eb5b208bdafc65958f5fe6d4cabb664c29191b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67eb5b2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild