$ git clone -n https://src.fedoraproject.org/rpms/rust-maybe-async.git /var/lib/mock/f40-build-2572160-62241/root/chroot_tmpdir/scmroot/rust-maybe-async
Cloning into '/var/lib/mock/f40-build-2572160-62241/root/chroot_tmpdir/scmroot/rust-maybe-async'...
$ git fetch origin 3dcb3f0d10fd62f91c6f130f015e285f2233bd62:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-maybe-async
 * [new ref]         3dcb3f0d10fd62f91c6f130f015e285f2233bd62 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3dcb3f0 Update to version 0.2.9 (rhbz#2261874)