$ git clone -n https://src.fedoraproject.org/rpms/R-tidyr.git /var/lib/mock/f45-build-6451-348/root/chroot_tmpdir/scmroot/R-tidyr
Cloning into '/var/lib/mock/f45-build-6451-348/root/chroot_tmpdir/scmroot/R-tidyr'...
$ git fetch origin 6b3036535f3ca49e2766631c4c7b2f91db89182f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tidyr
 * [new ref]         6b3036535f3ca49e2766631c4c7b2f91db89182f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b30365 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild