$ git clone -n https://src.fedoraproject.org/rpms/black-hole-solver.git /var/lib/mock/f40-build-763202-122451/root/chroot_tmpdir/scmroot/black-hole-solver
Cloning into '/var/lib/mock/f40-build-763202-122451/root/chroot_tmpdir/scmroot/black-hole-solver'...
$ git fetch origin 8a6830d9f8d7d2706970197fef1d3044d3f564a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/black-hole-solver
 * [new ref]         8a6830d9f8d7d2706970197fef1d3044d3f564a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a6830d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild