$ git clone -n https://src.fedoraproject.org/rpms/R-devtools.git /var/lib/mock/f38-build-side-42-init-devel-878857-28480/root/chroot_tmpdir/scmroot/R-devtools
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-878857-28480/root/chroot_tmpdir/scmroot/R-devtools'...
$ git fetch origin d8ceeb615b120d658b5bc90fc9203ab333188e46:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-devtools
 * [new ref]         d8ceeb615b120d658b5bc90fc9203ab333188e46 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8ceeb6 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild