$ git clone -n https://src.fedoraproject.org/rpms/R-rversions.git /var/lib/mock/f38-build-side-42-init-devel-925036-28744/root/chroot_tmpdir/scmroot/R-rversions
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-925036-28744/root/chroot_tmpdir/scmroot/R-rversions'...
$ git fetch origin 0f4637c861b1a0fda1da9d9ec2a7e73d6e37ca11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rversions
 * [new ref]         0f4637c861b1a0fda1da9d9ec2a7e73d6e37ca11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f4637c Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild