$ git clone -n https://src.fedoraproject.org/rpms/R-roxygen2.git /var/lib/mock/f45-build-6370-348/root/chroot_tmpdir/scmroot/R-roxygen2
Cloning into '/var/lib/mock/f45-build-6370-348/root/chroot_tmpdir/scmroot/R-roxygen2'...
$ git fetch origin 613d1de2915994ab855cf8464de97005b41ca635:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-roxygen2
 * [new ref]         613d1de2915994ab855cf8464de97005b41ca635 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 613d1de Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild