Re: [MirageOS-devel] Irmin, IMAP, MirageOS

[Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx>]

Hi Andre,

(adding the mirage list in /cc as I know that topic would interest other people 
there)

>> There are various IMAP implementation working
>> with MirageOS, maybe that would also help. Please let me know how this
>> goes, I would be happy to help if needed.
> 
> I did not found something like that. Please let me know, where they are 
> available.
> 
> I found several email-related implementations. Here are my favorites:
> 
> * https://github.com/gregtatcam/imaplet-lwt
> 
> an IMAP-Server which uses irmin as backend, but it seems not ready to use 
> with MirageOS.
> 
> 
> * https://github.com/janestreet/email_message
> * https://github.com/janestreet/async_smtp
> 
> The janestreet implementations depend on core and async, so they can't be 
> easily ported to MirageOS, because core (and core_kernel too) can't be linked 
> with the ukvm target.

I was thinking of https://github.com/nojb/ocaml-imap but it seems it's a client 
only (unfortunately). I know that imaplet-lwt was supposed to work with 
MirageOS at one point, but maybe that work have not been completed yet. Would 
be definitely useful to have an MirageOS compatible IMAP server.

> I have another question related to irmin:
> 
> To use irmin as an backend for an email server the RW interface would be 
> appropriate. Irmin_mirage does not expose RW.
> Is it possible to use irmin on top of Mirage_fs_lwt.S or Mirage_block_lwt.S 
> (and than expose RW)?
> 
> Or is something like that still WIP? Anil posted on the mirageos-devel 
> something about Gabriel's filesystem:
> https://lists.xenproject.org/archives/html/mirageos-devel/2017-05/msg00021.html

This is indeed currently not possible but one of the end goal of Gabriel's work 
is to have an Irmin backend on top of Mirage_block_lwt.S. It should be 
available in a few weeks. I think it should be easy to have an Irmin backend on 
top of Mirage_fs_lwt.S, but not very efficient (and the current implementation 
available for Mirage_fs_lwt.S is FAT, which is not a great FS in general -- so 
this would only be temporary until Gabriel's work land).

Best,
Thomas
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