$ git clone -n https://src.fedoraproject.org/rpms/R-keyring.git /var/lib/mock/f40-build-789476-135730/root/chroot_tmpdir/scmroot/R-keyring
Cloning into '/var/lib/mock/f40-build-789476-135730/root/chroot_tmpdir/scmroot/R-keyring'...
$ git fetch origin 6babab0bd5c5ac5321978b856fbc7620fa135065:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-keyring
 * [new ref]         6babab0bd5c5ac5321978b856fbc7620fa135065 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6babab0 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild