$ git clone -n https://src.fedoraproject.org/rpms/R-base64enc.git /var/lib/mock/f40-build-2031850-47647/root/chroot_tmpdir/scmroot/R-base64enc
Cloning into '/var/lib/mock/f40-build-2031850-47647/root/chroot_tmpdir/scmroot/R-base64enc'...
$ git fetch origin 48881fda6f2c7ea5a9d7061918abffd9c5b4c567:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-base64enc
 * [new ref]         48881fda6f2c7ea5a9d7061918abffd9c5b4c567 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48881fd Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild