Unchecked dependencies for environment

[m0rt3nlund]

Existing issue

• I have searched existing issues and could not find a duplicate.

Elixir and Erlang/OTP versions

Elixir 1.20.1
OTP 28 - erts-16.2

Operating system

Windows 11

Current behavior

I have a problem where I get the error Unchecked dependencies for environment dev at "random" times.

I can run mix deps.get and successfully resolve and lock all deps, then when running mix compile i get an error.
Then I can run mix compile x amount of times in succession and it suddenly resolves itself.

This happens to the deps that are configured using github or git as far as I can see.

Example:

$ mix compile
Unchecked dependencies for environment dev:
* ex_sysinfo (https://github.com/m0rt3nlund/ex_sysinfo.git)
  lock mismatch: the dependency is out of date. To fetch locked version run "mix deps.get"
** (Mix) Can't continue due to errors on dependencies

Y MINGW64 /c/Development/Source/x/Elixir/sky_client (release)
$ mix compile
Unchecked dependencies for environment dev:
* ex_sysinfo (https://github.com/m0rt3nlund/ex_sysinfo.git)
  lock mismatch: the dependency is out of date. To fetch locked version run "mix deps.get"
** (Mix) Can't continue due to errors on dependencies

Y MINGW64 /c/Development/Source/x/Elixir/sky_client (release)
$ mix compile
Unchecked dependencies for environment dev:
* speakers (https://github.com/m0rt3nlund/speakers.git - v0.1.1)
  lock mismatch: the dependency is out of date. To fetch locked version run "mix deps.get"
** (Mix) Can't continue due to errors on dependencies

Y MINGW64 /c/Development/Source/x/Elixir/sky_client (release)
$ mix compile
==> speakers
Compiling 4 files (.ex)`
.......
.....
...
``

### Expected behavior

Dependencies resolve and lock, once

[josevalim]

Hi @m0rt3nlund, thank you for the report. Can you please provide a mechanism that allows us to reproduce the error?

[m0rt3nlund]

Hi @m0rt3nlund, thank you for the report. Can you please provide a mechanism that allows us to reproduce the error?

I will try!

[m0rt3nlund]

Okay, I am able to reproduce the problem with this repo, at least on my own machine:

https://github.com/m0rt3nlund/Elixir-Dependency-test

Seems to be the combination of dependencies that trigger the condition, but I cannot understand directly why....

You have to run mix compile couple of times before it happens

[josevalim]

Thanks @m0rt3nlund. The projects fail to compile on my machine because there is no precompiled packages for my system. However, the projects above are still too large. It depends on rustler and other packages, which means I'd have to debug those too. Ideally we would isolate it to something that has no dependencies. Given the nature of the bug, you may be able to reproduce with any Git dependency. Perhaps you can have heroicons and decimal as git dependencies instead? Would that still reproduce the issue?

That said, the error you are seeing happens when the Git tag/version in the deps folder does not match the one in the mix.lock. I can think of two reasons why this happens:

• Something is changing the mix.lock file, which is something you would be able to verify to see if the file contents have changed
• Something is changing the contents of your deps/* folder, perhaps something is changing the branch/checkout/tags in there or perhaps something is blocking access for us to run git there. You can try running mix deps or going into the dependency and running git commands

Please keep us posted!

[m0rt3nlund]

I updated the deps to only include two github deps and I am still able to reproduce it.
I will see if I can detect file changes to the deps directoy or the mix.lock file.

[m0rt3nlund]

Hi!
Made a video where you can see file updates in the application on the left and and you can see that I start by cleaning the decimal deps just to start from the beginning and show that the file change detection is working.
Then I get the deps and compile.
I then compile in sequence (Skip some iterations in the video) and then suddenly it starts failing without no file changes.

[josevalim]

Thank you. This is very weird! When it starts failing, what happens if you got to the dependency that is failing and run a git status and git log? Is the dependency working there? Either git is misbehaving on your machine, or your file system, or Elixir. But it is something non-obvious!