$ git clone -n https://src.fedoraproject.org/rpms/python-blobfile.git /var/lib/mock/f45-build-29789-641/root/chroot_tmpdir/scmroot/python-blobfile
Cloning into '/var/lib/mock/f45-build-29789-641/root/chroot_tmpdir/scmroot/python-blobfile'...
$ git fetch origin 9dc8e55b960b727d917908d46b88a10a8385cfd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-blobfile
 * [new ref]         9dc8e55b960b727d917908d46b88a10a8385cfd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9dc8e55 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild