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Re: Adding Substitute Mirrors page to installer

From: raid5atemyhomework
Subject: Re: Adding Substitute Mirrors page to installer
Date: Tue, 09 Mar 2021 02:34:18 +0000


> Hi Guix Developers,
> I want to add a page to the installer to allow selection of substitute 
> mirrors. In particular, from my ISP, the SJTU mirror is significantly faster 
> (1MB/s->5MB/s) than directly from `` (4kB/s->40kB/s), so I 
> think putting that option to the installer would be beneficial to others in 
> similar circumstances.
> However, the current`(gnu installer services)` assumes that snippets are 
> added to a list of services. To implement substitute mirrors, I need to 
> insert a `modify-services` form with a `(guix-service-type config => 
> (guix-configuration (inherit config) (substitute-urls <whatever>))`.
> What I want to propose is something like this:
> -   Add a `snippet-type` field to `<system-service>`, default `'service-list`.
>     -   The field can instead be set to `'modify-services` to mean that the 
> snippet is to be in a `modify-services` form.
> -   In `system-services->configuration`, filter services according to 
> `snippet-type` and put the snippets in the appropriate parts of the `service` 
> form.
> -   Add entries for the SJTU mirror (with fallback to the original 
> ``) and the default unmirrored ``, with 
> `system-service-type` of `'substitute-urls`.
> -   Then in `(gnu installer newt services)`, add a page for 
> `'substitute-urls`.
>     What do you think?
>     Thanks
>     raid5atemyhomework

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