$ git clone -n https://src.fedoraproject.org/rpms/R-MatrixGenerics.git /var/lib/mock/f40-build-2321774-58607/root/chroot_tmpdir/scmroot/R-MatrixGenerics
Cloning into '/var/lib/mock/f40-build-2321774-58607/root/chroot_tmpdir/scmroot/R-MatrixGenerics'...
$ git fetch origin d143f215abdb6747caad4e5ab2f8b7e93d793329:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-MatrixGenerics
 * [new ref]         d143f215abdb6747caad4e5ab2f8b7e93d793329 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d143f21 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild