GNU bug report logs - #22962
Something keeps overwriting /etc/hosts

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Danny Milosavljevic <dannym <at> scratchpost.org>
To: bug-guix <at> gnu.org
Subject: Something keeps overwriting /etc/hosts
Date: Wed, 9 Mar 2016 21:42:32 +0100

Message #8 received at 22962 <at> debbugs.gnu.org (full text, mbox):

From: Danny Milosavljevic <dannym <at> scratchpost.org>
To: 22962 <at> debbugs.gnu.org
Subject: Re: bug#22962: Something keeps overwriting /etc/hosts
Date: Thu, 10 Mar 2016 00:28:11 +0100

If I make it immutable, I get the following message on guix system reconfigure ... :

  guix system: error: copy-file: Permission denied: "/etc/hosts"

Aha!

Message #11 received at 22962 <at> debbugs.gnu.org (full text, mbox):

From: Leo Famulari <leo <at> famulari.name>
To: Danny Milosavljevic <dannym <at> scratchpost.org>
Cc: 22962 <at> debbugs.gnu.org
Subject: Re: bug#22962: Something keeps overwriting /etc/hosts
Date: Wed, 9 Mar 2016 20:43:23 -0500

On Thu, Mar 10, 2016 at 12:28:11AM +0100, Danny Milosavljevic wrote:
> If I make it immutable, I get the following message on guix system reconfigure ... :
> 
>   guix system: error: copy-file: Permission denied: "/etc/hosts"
> 
> Aha!

I think that on GuixSD, the hosts file is generated from the system
configuration, specifically the 'hosts-file' field, which is mentioned
in section 7.2.2 Operating System Reference [0].

I assume that the resulting file is recreated each time you reconfigure. 

In that case, you'd want to leave the file /etc/hosts alone, and make
your changes in the operating system configuration.

I say "I think" and "I assume" because I haven't actually used
'hosts-file' yet, nor have I looked at that part of the code.

Does that help?

[0]
https://www.gnu.org/software/guix/manual/guix.html#operating_002dsystem-Reference

Message #14 received at 22962 <at> debbugs.gnu.org (full text, mbox):

From: Alex Kost <alezost <at> gmail.com>
To: Leo Famulari <leo <at> famulari.name>
Cc: Danny Milosavljevic <dannym <at> scratchpost.org>, 22962 <at> debbugs.gnu.org
Subject: Re: bug#22962: Something keeps overwriting /etc/hosts
Date: Thu, 10 Mar 2016 11:39:00 +0300

Leo Famulari (2016-03-10 04:43 +0300) wrote:

> On Thu, Mar 10, 2016 at 12:28:11AM +0100, Danny Milosavljevic wrote:
>> If I make it immutable, I get the following message on guix system reconfigure ... :
>>
>>   guix system: error: copy-file: Permission denied: "/etc/hosts"
>>
>> Aha!
>
> I think that on GuixSD, the hosts file is generated from the system
> configuration, specifically the 'hosts-file' field, which is mentioned
> in section 7.2.2 Operating System Reference [0].
>
> I assume that the resulting file is recreated each time you reconfigure.
>
> In that case, you'd want to leave the file /etc/hosts alone, and make
> your changes in the operating system configuration.
>
> I say "I think" and "I assume" because I haven't actually used
> 'hosts-file' yet, nor have I looked at that part of the code.

You are absolutely right!  On GuixSD, to modify /etc/hosts a user need
to adjust his/her system config.

Danny, you can keep your hosts file wherever you want, let's say
"~/my-config/hosts"; and you can add this line to your operating-system
declaration:

  (hosts-file (local-file (string-append (getenv "HOME")
                                         "/my-config/hosts")))

After reconfiguring your system, this file will be put into the store,
and /etc/hosts will have the same contents after reboot.

Moreover, every time you change this file and make a new system, a new
version of "hosts" will be put to the store.  So if you boot into some
old system, it will be booted with the hosts file that was used at that
time (as you can see, every system in /var/guix/profiles, has its own
"etc/hosts").

-- 
Alex

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