Something keeps overwriting /etc/hosts

DoneSubmitted by Danny Milosavljevic.
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4 participants
  • Alex Kost
  • Danny Milosavljevic
  • Leo Famulari
  • Ludovic Courtès
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unassigned
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normal
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Danny Milosavljevic wrote on 9 Mar 2016 21:42
(address . bug-guix@gnu.org)
20160309214232.027164e0@scratchpost.org
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Danny Milosavljevic wrote on 10 Mar 2016 00:28
(address . 22962@debbugs.gnu.org)
20160310002811.0b59a57f@scratchpost.org
If I make it immutable, I get the following message on guix system reconfigure ... :
guix system: error: copy-file: Permission denied: "/etc/hosts"
Aha!
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Leo Famulari wrote on 10 Mar 2016 02:43
(name . Danny Milosavljevic)(address . dannym@scratchpost.org)(address . 22962@debbugs.gnu.org)
20160310014323.GA29687@jasmine
On Thu, Mar 10, 2016 at 12:28:11AM +0100, Danny Milosavljevic wrote:
Toggle quote (6 lines)> 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 systemconfiguration, specifically the 'hosts-file' field, which is mentionedin 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 makeyour 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
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Alex Kost wrote on 10 Mar 2016 09:39
(name . Leo Famulari)(address . leo@famulari.name)
87k2la682j.fsf@gmail.com
Leo Famulari (2016-03-10 04:43 +0300) wrote:
Toggle quote (19 lines)> 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 needto 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-systemdeclaration:
(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 newversion of "hosts" will be put to the store. So if you boot into someold system, it will be booted with the hosts file that was used at thattime (as you can see, every system in /var/guix/profiles, has its own"etc/hosts").
-- Alex
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Ludovic Courtès wrote on 23 Mar 2016 19:18
control message for bug #22962
(address . control@debbugs.gnu.org)
871t71ukg4.fsf@gnu.org
tags 22962 notabug
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Ludovic Courtès wrote on 23 Mar 2016 19:19
(address . control@debbugs.gnu.org)
87zitpt5uw.fsf@gnu.org
tags 22962 fixedclose 22962 0.9.1
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