$ git clone -n https://src.fedoraproject.org/rpms/rust-async-attributes.git /var/lib/mock/f45-build-40234-769/root/chroot_tmpdir/scmroot/rust-async-attributes
Cloning into '/var/lib/mock/f45-build-40234-769/root/chroot_tmpdir/scmroot/rust-async-attributes'...
$ git fetch origin a1f0c3c1bfd4aae60d3a1dbc93f108c8799c2901:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-attributes
 * [new ref]         a1f0c3c1bfd4aae60d3a1dbc93f108c8799c2901 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1f0c3c Regenerate with rust2rpm v28