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Re: How best to set host key in vm

From: George myglc2 Clemmer
Subject: Re: How best to set host key in vm
Date: Thu, 15 Feb 2018 10:21:01 -0500
User-agent: mu4e 1.0; emacs 25.3.1

Hi Ludo’,

On 02/15/2018 at 14:51 Ludovic Courtès writes:

> George myglc2 Clemmer <address@hidden> skribis:
>> On 02/09/2018 at 11:02 Ludovic Courtès writes:
>>> George myglc2 Clemmer <address@hidden> skribis:
>>>> I want to set the host key in 'guix system vm-image' so that updating a
>>>> VM config does not break that VM's host key entry in my client machine
>>>> ~/.ssh/knownhosts files.  AFAIK there is no direct way to do this. I
>>>> tried this ...
>>> The recommendation in this case is to use “out-of-band” storage—i.e.,
>>> have the secrets stored in a place other than the store.
>>> For example, you could have an activation snippet that copies secret
>>> files directly to /etc, along these lines (untested):
>>>   (simple-service 'copy-private-key activation-service-type
>>>                   (with-imported-modules '((guix build utils))
>>>                     #~(begin
>>>                         (use-modules (guix build utils))
>>>                         (mkdir-p "/etc/ssh")
>>>                         (copy-file "/root/secrets/ssh_host_ed25519_key"
>>>                                    "/etc/ssh/ssh_host_ed25519_key'))))
>>> That means you have to arrange for /root/secrets/ssh_host_ed25519_key to
>>> exist in the first place, but that’s pretty much all we can do.
>> Thank you. So what is an easily-automated way to populate /root/secrets?
> Guix doesn’t have any helper module/tool for that yet.
> Perhaps ‘guix system vm-image’ could include a ‘--copy’ option that
> would copy a file from the host into the image.  We’d have to be careful
> with the implementation to make sure that it doesn’t end up in the host
> store nor in the guest store.

How about a '--copy-image=<imagefile>' option that copies the image out
of the store? Then the ‘--copy’ could operate on <imagefile> and fail
if it isn't specified.

- George

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