$ git clone -n https://src.fedoraproject.org/rpms/rust-piper.git /var/lib/mock/f40-build-2307581-57234/root/chroot_tmpdir/scmroot/rust-piper
Cloning into '/var/lib/mock/f40-build-2307581-57234/root/chroot_tmpdir/scmroot/rust-piper'...
$ git fetch origin 94c9b4e5b71c683dd09855bb3599757ca55b2b71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-piper
 * [new ref]         94c9b4e5b71c683dd09855bb3599757ca55b2b71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94c9b4e Update to version 0.2.1