Layer: true not compatible with individually packaging & module separation

[ribeirojose]

Bug Report

Description

1. What did you do? Tried to deploy several functions in different modules.

2. What happened?

3. What should've happened? Package each function individually, creating a layer with each function's requirements.

4. What's the content of your serverless.yml file?

service: name

provider:
  name: aws
  runtime: python3.8
  profile: default
  region: us-west-2

package:
  individually: true

exclude:
  - "**/*"

custom:
  pythonRequirements:
    useDownloadCache: true
    useStaticCache: true
    dockerizePip: non-linux
    noDeploy: []
    slim: true
    strip: false
    layer: true

functions:
  Function1:
    handler: index.handler
    module: functions/function1
    memorySize: 128
    timeout: 2

  Function2:
    handler: index.handler
    module: functions/function2
    memorySize: 128
    timeout: 2

  Function3:
    handler: index.handler
    module: functions/function3
    memorySize: 128
    timeout: 2

  Function4:
    handler: index.handler
    module: functions/function4
    memorySize: 128
    timeout: 2

plugins:
  - serverless-python-requirements
  - serverless-step-functions

5. What's the output you get when you use the SLS_DEBUG=* environment variable (e.g. SLS_DEBUG=* serverless deploy)

...
Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Excluding development dependencies...
Serverless: Excluding development dependencies...
Serverless: Excluding development dependencies...
Serverless: Packaging Python Requirements Lambda Layer...

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

  Error: ENOENT: no such file or directory, scandir '.serverless/requirements'

     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 ---------------------------
     Operating System:          darwin
     Node Version:              13.7.0
     Framework Version:         1.63.0
     Plugin Version:            3.3.0
     SDK Version:               2.3.0
     Components Core Version:   1.1.2
     Components CLI Version:    1.4.0

Similar or dependent issues: #373, #408, #328

[Obsecurus]

One workaround for this is to create 2 separate service definitions. One service that references an empty_requirements.txt file so it just copies the code in place using the package individually setting, and another service that references the real requirements.txt but is a layer only without a function definition. This article has an example layer-only file: https://medium.com/better-programming/intro-to-lambda-layers-in-python-95e092198c97

[rluts]

Any updates or alternative solutions regarding this issue?