$ git clone -n https://src.fedoraproject.org/rpms/cxxtools.git /var/lib/mock/f40-build-752674-116818/root/chroot_tmpdir/scmroot/cxxtools
Cloning into '/var/lib/mock/f40-build-752674-116818/root/chroot_tmpdir/scmroot/cxxtools'...
$ git fetch origin aed9ff4791073d549992e9ce01d456ff3299e252:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cxxtools
 * [new ref]         aed9ff4791073d549992e9ce01d456ff3299e252 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aed9ff4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild