$ git clone -n https://src.fedoraproject.org/rpms/megapixels.git /var/lib/mock/f45-build-18222-511/root/chroot_tmpdir/scmroot/megapixels
Cloning into '/var/lib/mock/f45-build-18222-511/root/chroot_tmpdir/scmroot/megapixels'...
$ git fetch origin 5262b43aea995f018305f677f55c76d75a4ad836:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/megapixels
 * [new ref]         5262b43aea995f018305f677f55c76d75a4ad836 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5262b43 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild