$ git clone -n https://src.fedoraproject.org/rpms/R-rprojroot.git /var/lib/mock/f38-build-side-42-init-devel-920684-28734/root/chroot_tmpdir/scmroot/R-rprojroot
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-920684-28734/root/chroot_tmpdir/scmroot/R-rprojroot'...
$ git fetch origin 67e292ba32cbef611af6128fad69ed092bbe4550:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rprojroot
 * [new ref]         67e292ba32cbef611af6128fad69ed092bbe4550 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67e292b Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild