GNU logs - #40412, boring messages

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Subject: bug#40412: cargo-build-system hides the package dependency graph
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Date: Fri, 3 Apr 2020 13:44:12 -0400
From: Leo Famulari <leo@HIDDEN>
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Some Guix commands like `guix graph` and `guix show` don't work as
expected for packages using the cargo-build-system.

The cargo-build-system uses only the source code of a package's
dependencies when building.

To achieve this, the build system does not refer to dependencies with
the usual 'inputs', 'native-inputs', and 'propagated-inputs', but
instead with the Scheme keywords #:cargo-inputs and
#:cargo-development-inputs. [0]

This means that it's not possible to work with the package dependency
graph like with other packages.

As a result, some Guix commands don't work as expected, such as `guix
graph` and `guix show`. I wonder if `guix refresh --update` works?

I'm not sure if this can be improved — there is a comment in ((guix
build-system cargo) expand-crate-sources) that explains why we did it
this way and acknowledges the problems.

[0] For example:

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Leo Famulari <leo@HIDDEN>
Subject: bug#40412: Acknowledgement (cargo-build-system hides the package
 dependency graph)
Message-ID: <handler.40412.B.158593586017787.ack <at>>
References: <20200403174412.GA7784@HIDDEN>
X-Gnu-PR-Message: ack 40412
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Reply-To: 40412 <at>
Date: Fri, 03 Apr 2020 17:45:02 +0000

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