$ git clone -n https://src.fedoraproject.org/rpms/rust-lipsum.git /var/lib/mock/f45-build-43001-799/root/chroot_tmpdir/scmroot/rust-lipsum
Cloning into '/var/lib/mock/f45-build-43001-799/root/chroot_tmpdir/scmroot/rust-lipsum'...
$ git fetch origin 2495584975198dac17f860ae626c82cc0b66776e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-lipsum
 * [new ref]         2495584975198dac17f860ae626c82cc0b66776e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2495584 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild