$ git clone -n https://src.fedoraproject.org/rpms/rust-ouroboros.git /var/lib/mock/f40-build-2073440-49358/root/chroot_tmpdir/scmroot/rust-ouroboros
Cloning into '/var/lib/mock/f40-build-2073440-49358/root/chroot_tmpdir/scmroot/rust-ouroboros'...
$ git fetch origin fc663d1399e6cea0ee55ecad0cd8a0b8400de240:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ouroboros
 * [new ref]         fc663d1399e6cea0ee55ecad0cd8a0b8400de240 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc663d1 Update to 0.17.2, resolves rhbz#2215171