$ git clone -n https://src.fedoraproject.org/rpms/rust-pipe-trait.git /var/lib/mock/f40-build-2251015-54102/root/chroot_tmpdir/scmroot/rust-pipe-trait
Cloning into '/var/lib/mock/f40-build-2251015-54102/root/chroot_tmpdir/scmroot/rust-pipe-trait'...
$ git fetch origin 5b84591c1e87896c629d0b811d06ef42efa1cb9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pipe-trait
 * [new ref]         5b84591c1e87896c629d0b811d06ef42efa1cb9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b84591 Update to 0.4.0