$ git clone -n https://src.fedoraproject.org/rpms/aw-server-rust.git /var/lib/mock/f45-build-39691-750/root/chroot_tmpdir/scmroot/aw-server-rust
Cloning into '/var/lib/mock/f45-build-39691-750/root/chroot_tmpdir/scmroot/aw-server-rust'...
$ git fetch origin 9aa205fa3bab65d2b2b13321c109a7f89e1cd2f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/aw-server-rust
 * [new ref]         9aa205fa3bab65d2b2b13321c109a7f89e1cd2f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9aa205f Update to 840d11c