$ git clone -n https://src.fedoraproject.org/rpms/R-cachem.git /var/lib/mock/f40-build-2339735-59672/root/chroot_tmpdir/scmroot/R-cachem
Cloning into '/var/lib/mock/f40-build-2339735-59672/root/chroot_tmpdir/scmroot/R-cachem'...
$ git fetch origin 8f852c0083d9a5a7eb1674833c39577579e8ca72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-cachem
 * [new ref]         8f852c0083d9a5a7eb1674833c39577579e8ca72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f852c0 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild