$ git clone -n https://src.fedoraproject.org/rpms/rust-uu_hashsum.git /var/lib/mock/f40-build-774050-127571/root/chroot_tmpdir/scmroot/rust-uu_hashsum
Cloning into '/var/lib/mock/f40-build-774050-127571/root/chroot_tmpdir/scmroot/rust-uu_hashsum'...
$ git fetch origin 666fd9d16a4932b5045badf2b017eb5ab30b1e7b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uu_hashsum
 * [new ref]         666fd9d16a4932b5045badf2b017eb5ab30b1e7b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 666fd9d Initial package (rhbz#2258126)