GNU bug report logs - #42410
Copying nars between stores fails for packages with multiple outputs

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Leo Famulari <leo <at> famulari.name>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#42410: closed (Copying nars between stores fails for packages
 with multiple outputs)
Date: Tue, 21 Jul 2020 19:34:02 +0000

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Your message dated Tue, 21 Jul 2020 15:33:10 -0400
with message-id <20200721193310.GA593 <at> jasmine.lan>
and subject line Re: bug#42410: Copying nars between stores fails for packages with multiple outputs
has caused the debbugs.gnu.org bug report #42410,
regarding Copying nars between stores fails for packages with multiple outputs
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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42410: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=42410
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From: Leo Famulari <leo <at> famulari.name>
To: bug-guix <at> gnu.org
Subject: Copying nars between stores fails for packages with multiple outputs
Date: Fri, 17 Jul 2020 16:43:19 -0400

Exporting a nar and importing it on another machine only works when the
package being built has a single output.

I set up a signing-key on the sending machine, authorized it on the
receiving machine, and successfully transferred some nars of
single-output packages. I say they succeeded because `guix build
--no-grafts foo` did not need to build foo after having imported the nar
archive built on the other machine.

However, it fails for packages with multiple outputs such as Syncthing
and libsmf.

I made sure both sides were trying to build the same derivation by using
`guix time-machine` and created the archives like this:

$ guix time-machine --commit=03f9a8c35be387f37badcd2c830ac7414ac17225 -- archive -r --no-grafts --export libsmf > ~/tmp/libsmf.nar

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From: Leo Famulari <leo <at> famulari.name>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 42410-done <at> debbugs.gnu.org
Subject: Re: bug#42410: Copying nars between stores fails for packages with
 multiple outputs
Date: Tue, 21 Jul 2020 15:33:10 -0400

On Tue, Jul 21, 2020 at 05:49:00PM +0200, Ludovic Courtès wrote:
> Hi,
> 
> Leo Famulari <leo <at> famulari.name> skribis:
> 
> > Exporting a nar and importing it on another machine only works when the
> > package being built has a single output.
> 
> Note that “guix archive --export foo” only exports foo:out.  If you want
> to export other outputs, you have to explicitly list them.
> 
> > I set up a signing-key on the sending machine, authorized it on the
> > receiving machine, and successfully transferred some nars of
> > single-output packages. I say they succeeded because `guix build
> > --no-grafts foo` did not need to build foo after having imported the nar
> > archive built on the other machine.
> 
> ‘guix build’ starts building unless all the outputs of the package are
> already in the store.
> 
> > However, it fails for packages with multiple outputs such as Syncthing
> > and libsmf.
> 
> Could it be that you copied only one output of the package, and thus
> ‘guix build’ considered it had to build it because the other outputs
> were missing?

Yes, that must be it! Thanks for your reply and I'll re-open this ticket
if necessary.

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