$ git clone -n https://src.fedoraproject.org/rpms/river.git /var/lib/mock/f39-build-2002165-44663/root/chroot_tmpdir/scmroot/river
Cloning into '/var/lib/mock/f39-build-2002165-44663/root/chroot_tmpdir/scmroot/river'...
$ git fetch origin 0f41d11200866a971af2f3fee9d0b53d9233dd22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/river
 * [new ref]         0f41d11200866a971af2f3fee9d0b53d9233dd22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f41d11 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild