$ git clone -n https://src.fedoraproject.org/rpms/R-doParallel.git /var/lib/mock/f45-build-6063-346/root/chroot_tmpdir/scmroot/R-doParallel
Cloning into '/var/lib/mock/f45-build-6063-346/root/chroot_tmpdir/scmroot/R-doParallel'...
$ git fetch origin 597bfb1ea20d8434d24bd8c8875ea5655757359e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-doParallel
 * [new ref]         597bfb1ea20d8434d24bd8c8875ea5655757359e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 597bfb1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild