Recovering from broken Guix due to GC'd derivations

Recovering from broken Guix due to GC'd derivations

[Mike Gerwitz]

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Hello, everyone:

I'm running into a bit of trouble and I'd like to know the best/proper
way to recover:

Any pull or package install operations that I attempt give me an error
like this (the exact derivation varies between my user and root, but
they're both Perl):

  guix pull: error: open-file: No such file or directory:
  "/gnu/store/fq9583a3w3is0r1yrjxg1znfz2qkvg78-perl-5.26.2.tar.xz.drv"

Or, if I try to pull using a local git repo:

  guix pull: error: build failed: opening file
  `/gnu/store/4417linxb223padiqavsf6xah7nvjwrh-perl-5.26.1.drv': No such
  file or directory

I had an old ~/.guix/config/latest symlink that I tried restoring (I
don't have ~/.guix/config/current yet), but no luck.

This seems to have happened after running a `guix gc`, after having
aborted a `guix pull`.  I forget the reason that I aborted---it's been
about a week since, but it was a kernel-related issue requiring a hard
reset.  perl-5.26.2.tar.xz, or a similar version, was one of the
packages downloaded during that pull.

I'm not familiar enough with guix to know how to recover from this.  Any
suggestions?

Thanks.

-- 
Mike Gerwitz

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Re: Recovering from broken Guix due to GC'd derivations

[Jone]

Maybe this helps (see manual):

"guix package:
...
--roll-back
    Roll back to the previous generation of the profile—i.e., undo the
    last transaction."
    
or again 'guix gc'.

Re: Recovering from broken Guix due to GC'd derivations

[Ludovic Courtès]

Hello Mike,

Mike Gerwitz <mtg@gnu.org> skribis:

> Any pull or package install operations that I attempt give me an error
> like this (the exact derivation varies between my user and root, but
> they're both Perl):
>
>   guix pull: error: open-file: No such file or directory:
>   "/gnu/store/fq9583a3w3is0r1yrjxg1znfz2qkvg78-perl-5.26.2.tar.xz.drv"

This cannot happen under normal circumstances, as we say.  Could it be
that you run a Guix configured with a different ‘localstatedir’ than the
original one that populated /gnu/store?

Remember that the store consists of two elements: /gnu/store, and
$localstatedir/guix/db/db.sqlite (usually /var/guix/db/db.sqlite).  If
you somehow end up using a different database, it may be incorrect
compared to what’s actually available in /gnu/store (info "(guix) The
Store").

For that reason, ‘configure’ tries hard to prevent you from configuring
Guix with a ‘localstatedir’ different from the one of the
already-installed Guix (see ‘GUIX_CHECK_LOCALSTATEDIR’ in m4/guix.m4.)

HTH,
Ludo’.

Re: Recovering from broken Guix due to GC'd derivations

[Mike Gerwitz]

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Hey, Ludo:

On Sun, Jun 10, 2018 at 18:45:19 +0200, Ludovic Courtès wrote:
> Hello Mike,
>
> Mike Gerwitz <mtg@gnu.org> skribis:
>
>> Any pull or package install operations that I attempt give me an error
>> like this (the exact derivation varies between my user and root, but
>> they're both Perl):
>>
>>   guix pull: error: open-file: No such file or directory:
>>   "/gnu/store/fq9583a3w3is0r1yrjxg1znfz2qkvg78-perl-5.26.2.tar.xz.drv"
>
> This cannot happen under normal circumstances, as we say.  Could it be
> that you run a Guix configured with a different ‘localstatedir’ than the
> original one that populated /gnu/store?

I've never done anything other than a normal `guix pull`.  When I was
working on the `guix environment` changes for containers months ago, I
was using `pre-inst-env', but nothing other than that.  I didn't provide
any options to `configure' or anything change any other env vars.

Since before March, I've just been using a vanilla guix (rather than my
local git checkout).

-- 
Mike Gerwitz
Free Software Hacker+Activist | GNU Maintainer & Volunteer
GPG: D6E9 B930 028A 6C38 F43B  2388 FEF6 3574 5E6F 6D05
https://mikegerwitz.com

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Re: Recovering from broken Guix due to GC'd derivations

[Ludovic Courtès]

Hi Mike,

Mike Gerwitz <mtg@gnu.org> skribis:

> On Sun, Jun 10, 2018 at 18:45:19 +0200, Ludovic Courtès wrote:
>> Hello Mike,
>>
>> Mike Gerwitz <mtg@gnu.org> skribis:
>>
>>> Any pull or package install operations that I attempt give me an error
>>> like this (the exact derivation varies between my user and root, but
>>> they're both Perl):
>>>
>>>   guix pull: error: open-file: No such file or directory:
>>>   "/gnu/store/fq9583a3w3is0r1yrjxg1znfz2qkvg78-perl-5.26.2.tar.xz.drv"
>>
>> This cannot happen under normal circumstances, as we say.  Could it be
>> that you run a Guix configured with a different ‘localstatedir’ than the
>> original one that populated /gnu/store?
>
> I've never done anything other than a normal `guix pull`.  When I was
> working on the `guix environment` changes for containers months ago, I
> was using `pre-inst-env', but nothing other than that.  I didn't provide
> any options to `configure' or anything change any other env vars.
>
> Since before March, I've just been using a vanilla guix (rather than my
> local git checkout).

Hmm weird.  Did you try running ‘guix gc --verify’?  I don’t see how one
could end up in such a state, unless there’s some hard disk corruption
or something.

Ludo’.

Re: Recovering from broken Guix due to GC'd derivations

[Mike Gerwitz]

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On Mon, Jun 11, 2018 at 13:08:52 +0200, Ludovic Courtès wrote:
> Hmm weird.  Did you try running ‘guix gc --verify’?  I don’t see how one
> could end up in such a state, unless there’s some hard disk corruption
> or something.

That did it.  It removed 83 packages, and pulling now works.  Thank you!

I'm sorry that I can't provide more information.

-- 
Mike Gerwitz
Free Software Hacker+Activist | GNU Maintainer & Volunteer
GPG: D6E9 B930 028A 6C38 F43B  2388 FEF6 3574 5E6F 6D05
https://mikegerwitz.com

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