$ git clone -n https://src.fedoraproject.org/rpms/R-gh.git /var/lib/mock/f40-build-2339921-59683/root/chroot_tmpdir/scmroot/R-gh
Cloning into '/var/lib/mock/f40-build-2339921-59683/root/chroot_tmpdir/scmroot/R-gh'...
$ git fetch origin c97b175ff85a907a680ff842bec4a5508ce2d9ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gh
 * [new ref]         c97b175ff85a907a680ff842bec4a5508ce2d9ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c97b175 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild