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Re: Why are these derivations different?

From: Jack Hill
Subject: Re: Why are these derivations different?
Date: Sat, 8 Jun 2019 22:43:14 -0400 (EDT)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Sat, 8 Jun 2019, Marius Bakke wrote:

Jack Hill <address@hidden> writes:

Hi Guix,

I'm trying to copy the store items for ungoogled-chromium from one of my
hosts that has many computational resources to another one that does not,
so that I do not have to build ungoogled-chromium on the less powerful

However, even after copying the store items using guix archive --export |
guix archive --import, the less powerful host wants to build
ungoogled-chromium because the derivations differ (see attachments).

I suspect this has to do with grafts.  Guix is missing a substitute for
the 'ungrafted' package and fails to realize the grafted derivation.

Exporting with --no-grafts should do the trick.


Thanks! That was it.

If you don't mind, I have a few follow up question to help me understand how everything works:

How is guix archive --no-grafts different from guix build --no-grafts? Oh, or after reading the manual for --no-grafts again, maybe I used the wrong incantation (guix build --no-grafts package-name instead of guix build package-name --no-grafts)?

What's really going on with --no-grafts. Is it that guix on my less powerful host has never seen the the ungoogled-chromium version build against the older dependencies, so doesn't accept the older version that could be grafted? I guess, I'm not sure exactly what you mean by "fails to realize the grafted derivation". Is that a bug?

Sorry, I don't think that question was very clear. It probably means that while I think I know what grafts are, I don't know enough about what's going on to ask the question properly. I think this all could be summarized as, "please explain more."

Many thanks,

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