Hi Guix,

Revised patch series is attached.

Changes in v2:

* let the shepherd service depend on (loopback) instead of
  (networking)
* added a (broken) system test for the IPFS service

Changes in v3:

* added 'extensions' argument to 'marionette-operating-system'. 
* fixed the system test
* tweaked the documentation formatting and removed a misleading comment
  on forwarding (port forwarding would be fine here, as the test is run
  in a container so there is no risk of port conflicts IIUC)

Ludovic Courtès wrote:
> Nitpick: please avoid ‘@’.  Instead, explicitly do:
> [...]

I actually prefer '(@ (...) ...)' here, but whatever.  It's changed
in v3.

> As it stands, the test fails because you need to:
>  (define test
>    (with-extensions (list guile-json)
>      …))

As the uploading and downloading is done in the guest, not the host,
this needs to be done somewhat differently.  That's what the patch
‘tests: Support package extensions in the backdoor REPL’ is for.

Greetings,
Maxime