$ git clone -n https://src.fedoraproject.org/rpms/R-readr.git /var/lib/mock/f40-build-789206-135680/root/chroot_tmpdir/scmroot/R-readr
Cloning into '/var/lib/mock/f40-build-789206-135680/root/chroot_tmpdir/scmroot/R-readr'...
$ git fetch origin 5009bfe3ffd7f4a3085abe4b6369db689a05e758:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-readr
 * [new ref]         5009bfe3ffd7f4a3085abe4b6369db689a05e758 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5009bfe Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild