Re: [MirageOS-devel] Building ocaml-vchan's mirage test

[Thomas Leonard <talex5@xxxxxxxxx>]

On 30 August 2017 at 20:43, Mike Neilsen <mike.neilsen@xxxxxxxxxxxxxxxxx> wrote:
> I'm interested in exercising the "vchan-xen" OPAM package in a Mirage
> unikernel, and I figured a good way to get started would be to study
> the test/example code accompanying the ocaml-vchan[0] project.
> However, I'm struggling to get the lib_test/mirage[1] unikernels to
> compile.
>
> I'm using Mirage 3.0.5 and vchan-xen 3.0.0.
>
> I updated config_server.ml and config_client.ml to use the newest
> Functoria syntax and succeeded in configuring the unikernels.  But
> when I try to build them, I get the following error (server case is
> shown here, but client is similar):
>
> File "unikernel.ml", line 32, characters 5-9:
> Error: This pattern matches values of type
>          [< `Eof | `Error of 'a | `Ok of 'b ]
>        but a pattern was expected which matches values of type
>          (VX.buffer Mirage_flow.or_eof, VX.error) Result.result =
>            (VX.buffer Mirage_flow.or_eof, VX.error) result
>
> I'm not sure what to make of this...  My questions:
>
> * Is there a simple way to rectify this problem?

The error says the result is now of type "result", which means either
Ok or Error, not `Ok, `Error or `Eof.
(note the lack of the ` on the new constructors).

> * Is anyone successfully using ocaml-vchan in Mirage?

The Qubes firewall uses it:

https://github.com/talex5/qubes-mirage-firewall


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