bug#73453: mix-build-system does not make Erlang packages available as Elixir dependencies

[paul via Bug reports for GNU Guix <bug-guix@gnu.org>]

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Dear Guix ,

please consider the attached guix.scm. If you try to build it you will 
notice many messages as the following:

  warning: :telemetry.execute/3 is undefined (module :telemetry is not available or is yet to be defined)


until the build fails with:

16:26:55.642 [notice] Application eex exited: :stopped
** (Mix) Could not start application telemetry: could not find application file: telemetry.app
error: in phase 'check': uncaught exception:
%exception #<&invoke-error program: "mix" arguments: ("do" "compile" "--no-deps-check" "--no-prune-code-paths" "+" "test" "--no-deps-check") exit-status: 1 term-signal: #f stop-signal: #f>
phase `check' failed after 0.4 seconds
command "mix" "do" "compile" "--no-deps-check" "--no-prune-code-paths" "+" "test" "--no-deps-check" failed with status 1
build process 18 exited with status 256




This is because Erlang dependencies are not made available to Elixir 
builds. I'm sending a patch addressing this issue.


Thank you for your work,


giacomo

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[-- Attachment #2: guix.scm --]
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(use-modules (guix packages)
             (guix download)
             (guix licenses)
             (guix build-system mix)
             (guix build-system rebar)
             (gnu packages elixir-xyz)
             (gnu packages erlang-xyz))
(define-public elixir-stream-data
  (package
    (name "elixir-stream-data")
    (version "1.1.1")
    (source
     (origin
       (method url-fetch)
       (uri (hexpm-uri "stream_data" version))
       (sha256
        (base32 "134c7dyvprvnfm7fz6dvhk1mifrd0iq2pwjkzmiq8wq6pm3cvl25"))))
    (build-system mix-build-system)
    (native-inputs
     (list elixir-excoveralls))
    (synopsis "Data generation and property-based testing for Elixir")
    (description "@code{StreamData} is an Elixir library for data generation and
property-based testing.")
    (home-page "https://hexdocs.pm/stream_data/")
    (license asl2.0)))
(define-public elixir-decimal
  (package
    (name "elixir-decimal")
    (version "2.1.1")
    (source
     (origin
       (method url-fetch)
       (uri (hexpm-uri "decimal" version))
       (sha256
        (base32 "1k7z418b6cj977wswpxsk5844xrxc1smaiqsmrqpf3pdjzsfbksk"))))
    (build-system mix-build-system)
    (native-inputs
     (list elixir-stream-data))
    (synopsis "Arbitrary precision decimal arithmetic")
    (description "This package provides @code{elixir-decimal}, a library that
represents values internally using three integers: a sign, a coefficient, and an
exponent.  In this way, numbers of any size and with any number of decimal
places can be represented exactly.")
    (home-page "https://hexdocs.pm/decimal/")
    (license asl2.0)))
(define-public erlang-telemetry
  (package
    (name "erlang-telemetry")
    (version "1.3.0")
    (source
     (origin
       (method url-fetch)
       (uri (hexpm-uri "telemetry" version))
       (sha256
        (base32 "1rkrbf3z7my9dsz9km7077anp6f0nyapmf5lyij3grnv364zq5bh"))))
    (build-system rebar-build-system)
    (synopsis "Dynamic dispatching library for metrics and instrumentations")
    (description
     "@code{Telemetry} is a lightweight library for dynamic dispatching of
events, with a focus on metrics and instrumentation.  Any Erlang or Elixir
library can use @code{telemetry} to emit events.  Application code and other
libraries can then hook into those events and run custom handlers.")
    (home-page "https://hexdocs.pm/telemetry/")
    (license asl2.0)))
(define-public elixir-ecto
  (package
    (name "elixir-ecto")
    (version "3.12.3")
    (source
     (origin
       (method url-fetch)
       (uri (hexpm-uri "ecto" version))
       (sha256
        (base32 "0rcisp34m8b058jrcf52nziyscmn1h6yfjfw91ggj8p7d9893zcy"))))
    (build-system mix-build-system)
    (propagated-inputs (list elixir-decimal elixir-jason erlang-telemetry))
    (synopsis
     "Toolkit for data mapping and language integrated query for Elixir")
    (description
     "This package provides a toolkit for data mapping and language integrated query
for Elixir.")
    (home-page "https://hexdocs.pm/ecto/")
    (license asl2.0)))
elixir-ecto