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Backup debconf state

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  Backup debconf state Erwan David <erwan@rail.eu.org> - 2021-01-19 16:20 +0100
    Re: Backup debconf state Andy Smith <andy@strugglers.net> - 2021-01-19 16:30 +0100
      Re: Backup debconf state Erwan David <erwan@rail.eu.org> - 2021-01-19 16:40 +0100
    Re: Backup debconf state Sven Joachim <svenjoac@gmx.de> - 2021-01-19 17:40 +0100

#230848 — Backup debconf state

Hello everybody

If I want to be able to fast reinstall a debian after a crash, I already 
backup /etc (including /etc/apt), a file with the output of
apt-show manual
to get the list of manually installed packages, /etc, but It would be 
handy to have the state of debconf (with all the answers I already gave).
Is a backup of /var/cache debconf sufficient for this ?

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#230849

Hi Erwan,

On Tue, Jan 19, 2021 at 04:09:47PM +0100, Erwan David wrote:
> It would be handy to have the state of debconf (with all the
> answers I already gave).

I do:

dpkg --get-selections \* > /var/lib/dpkg_selections
debconf-get-selections > /var/lib/debconf_selections

(and then back up those files)

You can restore them with the corresponding --set-selections.

> Is a backup of /var/cache debconf sufficient for this ?

I think that stuff lives in /var/lib, but it's better to export it
in a format where it can be re-imported.

Cheers,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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#230851

Le 19/01/2021 à 16:23, Andy Smith a écrit :
> Hi Erwan,
> 
> On Tue, Jan 19, 2021 at 04:09:47PM +0100, Erwan David wrote:
>> It would be handy to have the state of debconf (with all the
>> answers I already gave).
> 
> I do:
> 
> dpkg --get-selections \* > /var/lib/dpkg_selections
> debconf-get-selections > /var/lib/debconf_selections
> 
> (and then back up those files)
> 
> You can restore them with the corresponding --set-selections.
> 
>> Is a backup of /var/cache debconf sufficient for this ?
> 
> I think that stuff lives in /var/lib, but it's better to export it
> in a format where it can be re-imported.
> 
> Cheers,
> Andy
> 


Thanks for the debconf-get-selections.
the dpkg --get-selections is an old command, but I prefer the apt-show 
manual wich gives only the manually installed packages, installing them 
will install the dependencies, no problem, but they will be marked as such.

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#230854

On 2021-01-19 16:09 +0100, Erwan David wrote:

> Hello everybody
>
> If I want to be able to fast reinstall a debian after a crash, I
> already backup /etc (including /etc/apt), a file with the output of
> apt-show manual
> to get the list of manually installed packages, /etc, but It would be
> handy to have the state of debconf (with all the answers I already
> gave).
> Is a backup of /var/cache debconf sufficient for this ?

Yes, that should be enough.  Note that maintainer scripts which use
debconf should first consult the configuration files in /etc and only
fall back to the debconf database if those do not deliver the necessary
information.  That's why the debconf database is located under
/var/cache and not under /var/lib.

Cheers,
       Sven

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