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Re: guixsd install questions

From: Ludovic Courtès
Subject: Re: guixsd install questions
Date: Sat, 01 Jul 2017 16:05:40 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Divan Santana <address@hidden> skribis:

> Ludovic Courtès <address@hidden> writes:


>> My guess is that you’d need to explicitly mark one of the mapped device
>> as depending on the other; this cannot be guessed.
>> If you run “guix system shepherd-graph” on your config you’ll probably
>> see that there’s no such dependency.
>> Currently dependencies among mapped devices cannot be expressed, but
>> that’s easy to fix (by providing a ‘dependencies’ field as in
>> ‘file-system’.)
> So I've tried altering the code and asked on IRC a while back too. I
> tried some of the suggestions that were given but none of them worked.
> Would you be able to "spell out" for someone clueless what the code
> should look like to express the dependencies.
> Currently the code looks like this
>   (bootloader (grub-configuration (device "/dev/vdb")))
>   (mapped-devices (list
>                    (mapped-device
>                     (source (list "/dev/vdb1" "/dev/vdc1"))
>                     (target "/dev/md0")
>                     (type raid-device-mapping))
>                    (mapped-device
>                     (source (uuid "1c0f1601-97f4-4a3d-9528-cd76130ff919"))
>                     (target "crypt")
>                     (type luks-device-mapping))))
>   (file-systems (cons (file-system
>                        (device "/dev/mapper/crypt")
>                        (title 'device)
>                        (mount-point "/")
>                        (type "ext4"))
>                       %base-file-systems))

You can have your file system depend on the two mapped devices like

   (file-systems (cons (file-system
                        (device "/dev/mapper/crypt")
                        (title 'device)
                        (mount-point "/")
                        (type "ext4")
                        (dependencies mapped-devices))

What *cannot* be expressed yet is dependencies among mapped devices.
For that we need to extend the <mapped-device> record with a
‘dependencies’ field like <file-system> does.

You’re welcome to start working on it if you feel like it (and I’d be
happy to help!) and/or submit it to address@hidden

I hope this is a bit clearer now!


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