$ git clone -n https://src.fedoraproject.org/rpms/R-MatrixGenerics.git /var/lib/mock/f41-build-side-1-3142761-40009/root/chroot_tmpdir/scmroot/R-MatrixGenerics
Cloning into '/var/lib/mock/f41-build-side-1-3142761-40009/root/chroot_tmpdir/scmroot/R-MatrixGenerics'...
$ git fetch origin 3515d37c0aa81aa1646f0aa8d82292c485db9387:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-MatrixGenerics
 * [new ref]         3515d37c0aa81aa1646f0aa8d82292c485db9387 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3515d37 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild