phf
Prevent Mix from fetching dependencies
Hi!
The objective is to prevent Mix from fetching dependencies and to rely solely on ERL_LIBS. The idea is that all dependencies are already available through ERL_LIBS, which have been added by Guix.
However, the issue arises when using mix compile. It attempts to fetch dependencies regardless of existing settings. Currently, no option prevents this behavior; it always tries and subsequently fails. A potential workaround is to patch mix.exs so that the project() function returns a key/value list with the deps key set to [].
For instance, in the Mix project named makeup, there isn’t a straightforward method to instruct mix to avoid fetching nimble_parsec, even when it’s already available in ERL_LIBS:
┌────
│ $ mix compile --no-deps-check
│ Could not find Hex, which is needed to build dependency :nimble_parsec
│ Shall I install Hex? (if running non-interactively, use "mix local.hex --force") [Yn] n
│ ** (Mix) Could not find an SCM for dependency :nimble_parsec from Makeup.Mixfile
└────
It’s evident from the IEx session below that nimble_parsec is
available:
┌────
│ $ iex
│ Interactive Elixir (1.14.0) - press Ctrl+C to exit (type h() ENTER for help)
│ iex(1)> :code.which(NimbleParsec)
│ '/gnu/store/261qi8bmagns11d3ssiypbqj82i9k16g-profile/lib/elixir/1.14/nimble_parsec/ebin/Elixir.NimbleParsec.beam'
└────
So, the pressing question is: how can we configure mix to prioritize ERL_LIBS over fetching new dependencies?
Marked As Solved
phf
If nimble_parsec package is built locally:
/tmp/guix-build-elixir-nimble-parsec-1.3.1.drv-4$ tree -L 5
.
├── _build
│ └── prod
│ └── lib
│ └── nimble_parsec
│ ├── consolidated
│ └── ebin
├── CHANGELOG.md
├── CHECKSUM
├── environment-variables
├── lib
│ ├── mix
│ │ └── tasks
│ │ └── nimble_parsec.compile.ex
│ ├── nimble_parsec
│ │ ├── compiler.ex
│ │ └── recorder.ex
│ └── nimble_parsec.ex
├── metadata.config
├── mix.exs
├── README.md
└── VERSION
and a symlink has been built in the source of the package makeup that depends on nimble_parsec like so:
/tmp/guix-build-elixir-makeup-1.1.0.drv-6$ tree _build/
_build/
└── prod
└── lib
└── nimble_parsec -> /tmp/guix-build-elixir-nimble-parsec-1.3.1.drv-4/_build/prod/lib/nimble_parsec
then mix does not fetch dependencies:
/tmp/guix-build-elixir-makeup-1.1.0.drv-6$ guix shell elixir -- bash -c 'MIX_ENV=prod mix compile --no-deps-check'
Compiling 44 files (.ex)
Generated makeup app
It suffices to generalize that idea for all dependencies of a given package.
Popular in Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
Deploy Phoenix to your own VPS with PaaS ease: push-to-deploy, zero downtime, auto SSL, managed Postgres. 14-day free trial at potions.io
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #advent-of-code
- #elixirconf-us
- #distillery
- #processes
- #forms
- #api
- #metaprogramming
- #security
- #performance
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Real-time error tracking, performance insights, and observability for devs.
Producing high quality Elixir screencasts since 2017.
Enabling companies to succeed by building software people love.
The deployment platform built for Elixir: PaaS ease, VPS control.
Courses that'll move you from confusion to "Aha, now I get it!"