Python not picked up on path

[kadrach]

which python
/home/kadrach/.pyenv/shims/python
which python3.6
/home/kadrach/.pyenv/versions/3.6.0/bin/python3.6

(these refer to the same python 3.6 installation). The pyenv shim is on path, yet the serverless plugin fails to pick it up:

Serverless: Generating requirements.txt from Pipfile...                                                    
Serverless: Installing required Python packages with undefined...                                          
                          
  Type Error ---------------------------------------------                                                 
                          
  "file" argument must be a non-empty string         
                          
     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.                   
                          
  Get Support --------------------------------------------                                                 
     Docs:          docs.serverless.com              
     Bugs:          github.com/serverless/serverless/issues                                                
     Forums:        forum.serverless.com             
     Chat:          gitter.im/serverless/serverless  
                          
  Your Environment Information -----------------------------                                               
     OS:                     linux                   
     Node Version:           8.2.0                   
     Serverless Version:     1.24.0             

I can fix this with the following directive:

custom:
  pythonRequirements:
    pythonBin: python

but isn't this just referencing the same Python it should be using by default? Should this not work out of the box?

[dschep]

Yeah, that should work out of the box. My only guess is that your PATH env var isn't exported, if you run node, what's the output of process.env.PATH?

[dschep]

Oh wait.. i see the Installing required Python packages with undefined... part now. That's not right.. could you share your serverless.yml? It should be defaulting to your runtime

[kadrach]

Removed all pieces that didn't seem to affect the minimal example:

---
service:
  name: foo 

frameworkVersion: ">=1.24.0"  # Only version tested

plugins:
  - serverless-python-requirements

# custom:
  # pythonRequirements:
  #   pythonBin: python

provider:
  name: aws

functions:
  dispatch:
    handler: dispatch.handler
    runtime: python3.6

The required python is first on path, but above example only works if I uncomment the custom block.

[kadrach]

This line is looking for serverless.service.provider.runtime.

The Serverless docs allow for an optional override in the function directive. This may be a misunderstanding on my part, but I assumed I can specify the runtime at function level without setting a provider-level default (given my full example runs one method in node and one in python, setting a default didn't make much sense to me).

[dschep]

Ah, yes, this plugin doesn't support per function packaging, so it uses the global provider specification, you'll have to set it for the plugin to work.

[dschep]

I could default it to python if not set tho. but then there's no guarantee that it's the right version of python.