$ git clone -n https://src.fedoraproject.org/rpms/R-cachem.git /var/lib/mock/f40-build-2155814-50918/root/chroot_tmpdir/scmroot/R-cachem
Cloning into '/var/lib/mock/f40-build-2155814-50918/root/chroot_tmpdir/scmroot/R-cachem'...
$ git fetch origin 2e18c7d8336f8145cc1d7dd6f1cd55ceb92d37f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-cachem
 * [new ref]         2e18c7d8336f8145cc1d7dd6f1cd55ceb92d37f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e18c7d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild