$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_expr.git /var/lib/mock/f40-build-1906036-25074/root/chroot_tmpdir/scmroot/rust-uu_expr
Cloning into '/var/lib/mock/f40-build-1906036-25074/root/chroot_tmpdir/scmroot/rust-uu_expr'...
$ git fetch origin cd759b95dff474d39f3971d3982a2d9f9fad613a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_expr
 * [new ref]         cd759b95dff474d39f3971d3982a2d9f9fad613a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd759b9 Update to version 0.0.27; Fixes: RHBZ#2260211