invoke local docker does not include dependencies added by plugins

[endeepak]

This is a Bug Report

Description

This issue happens when using plugin serverless-python-requirements to ensure dependencies defined in requirements.txt are included in the lambda package

• What went wrong?
  sls invoke local --docker doesn't include the dependencies and the lambda fails to import the dependencies

• What did you expect should have happened?
  sls invoke local --docker should add the dependencies added by plugin to docker container so that lambda can import them successfully

• What was the config you used?
  serverless.yml

service: dependency-bug

provider:
  name: aws
  runtime: python2.7

functions:
  hello:
    handler: handler.hello

plugins:
  - serverless-python-requirements

handler.py

import os
import dns.resolver

def hello(event, context):
    return "hello"

• What stacktrace or error message from your provider did you see?

➜  env-var-bug sls invoke local -f hello
"hello"
➜  env-var-bug sls invoke local -f hello --docker
Serverless: Building Docker image...
START RequestId: 9fcc8921-a77c-4578-bc35-1660bf3eb244 Version: $LATEST

Unable to import module 'handler': No module named dns.resolver
END RequestId: 9fcc8921-a77c-4578-bc35-1660bf3eb244

REPORT RequestId: 9fcc8921-a77c-4578-bc35-1660bf3eb244 Duration: 5 ms Billed Duration: 100 ms Memory Size: 1536 MB Max Memory Used: 14 MB


{"errorMessage": "Unable to import module 'handler'"}


  Error --------------------------------------------------

  1

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Issues:        forum.serverless.com

  Your Environment Information -----------------------------
     OS:                     darwin
     Node Version:           10.11.0
     Serverless Version:     1.39.1

Similar or dependent issues:

• Invoke local docker #5863

Additional Data

• Serverless Framework Version you're using: 1.39.1
• Operating System: mac OSX High Sierra
• Stack Trace: Provided Above
• Provider Error messages: Provided Above

[endeepak]

Possible solution: Update invokeLocal command to do following steps after building the docker image

• invoke the package command which will create a package with dependencies added by plugins
• extract this generated package contents in docker container similar to https://github.com/serverless/serverless/blob/master/lib/plugins/aws/invokeLocal/index.js#L326
• run the container