$ git clone -n https://src.fedoraproject.org/rpms/R-diffobj.git /var/lib/mock/f38-build-side-42-init-devel-603605-26221/root/chroot_tmpdir/scmroot/R-diffobj
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-603605-26221/root/chroot_tmpdir/scmroot/R-diffobj'...
$ git fetch origin 50965d26b59f75a88acd24475640940e1ab9127f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-diffobj
 * [new ref]         50965d26b59f75a88acd24475640940e1ab9127f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50965d2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild