bug#63786: [PATCH] home: services: ssh: Allow unset boolean

[Efraim Flashner <efraim@flashner.co.il>]

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On Mon, Jun 12, 2023 at 08:58:18AM +0400, Andrew Tropin wrote:
> 
> A few years ago, when we were implementing the first version of ssh home
> service in rde we went a slightly different way and didn't hardcode any
> record fields and let user set an alist of key/value pairs:
> https://git.sr.ht/~abcdw/rde/tree/19c2d2f0996624eea8b7a87b14bbc31e4a9b943b/src/gnu/home-services/ssh.scm#L204
> 
> It's not a perfect solution either, but quite flexible.  Also, it's
> relatively easy to implement default values: we can provide
> %default-host-options and ask people to do something like this on user
> side configuration:
> 
> (merge %default-host-options '((compression . #f)))
> 
> Of course "asking people" won't work, so it's possible to set a default
> value of options field to %default-host-options
> https://git.sr.ht/~abcdw/rde/tree/19c2d2f0996624eea8b7a87b14bbc31e4a9b943b/src/gnu/home-services/ssh.scm#L100
> and let people override it with '((compression . #f)) or enrich with
> (merge %default-host-options '((compression . #f))).
> 
> It's not a proposal or something, just sharing how it's implemented in
> rde.

I'm still undecided about the alist as a comparison. It would make it
easier to add arbitrary fields, but then I feel like maybe we should be
adding something to validate the configurations.

> P.S. Note that (gnu home-services *) modules are subject to deprecation
> and when (rde home services ssh) appear, it will have a slightly
> different interface.


I went ahead and pushed the patch. I believe that, after having added to
a .ssh/config file over a period of time, line by line or entry by
entry, people will be surprised to see a bunch of fields filled in
automatically, and with different results from what they had before.


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