Generating requirements.txt from Pipfile... stage fails if a deploymentBucket is specified for an AWS lambda

[wattdave]

Strange but true - in my setup, I have:

  name: aws
  runtime: python3.6
  stage: ${opt:stage, self:custom.defaultStage}
  region: ${self:custom.profiles.${self:provider.stage}.region}
  profile: ${self:custom.profiles.${self:provider.stage}.profileName}
  memorySize: 128
  timeout: 15
  deploymentBucket:
    name: ${self:provider.stage}-lambda-deployment

And if I use this and do sls package I get:

Serverless: Load command run
Serverless: Load command config
Serverless: Load command config:credentials
Serverless: Load command create
Serverless: Load command install
Serverless: Load command package
Serverless: Load command deploy
Serverless: Load command deploy:function
Serverless: Load command deploy:list
Serverless: Load command deploy:list:functions
Serverless: Load command invoke
Serverless: Load command invoke:local
Serverless: Load command info
Serverless: Load command logs
Serverless: Load command login
Serverless: Load command logout
Serverless: Load command metrics
Serverless: Load command remove
Serverless: Load command rollback
Serverless: Load command rollback:function
Serverless: Load command slstats
Serverless: Load command plugin
Serverless: Load command plugin
Serverless: Load command plugin:install
Serverless: Load command plugin
Serverless: Load command plugin:uninstall
Serverless: Load command plugin
Serverless: Load command plugin:list
Serverless: Load command plugin
Serverless: Load command plugin:search
Serverless: Load command emit
Serverless: Load command config
Serverless: Load command config:credentials
Serverless: Load command rollback
Serverless: Load command rollback:function
Serverless: Load command requirements
Serverless: Load command requirements:clean
Serverless: Load command requirements:install
Serverless: Invoke package
Serverless: Invoke aws:common:validate
Serverless: Invoke aws:common:cleanupTempDir
Serverless: Generating requirements.txt from Pipfile...
 
  Error --------------------------------------------------
 
  ENOENT: no such file or directory, open '/home/data/home/wattd/dev/wattd/startover/.serverless/requirements.txt'

If I comment out the deploymentBucket lines, it proceeds without errors:

Serverless: Load command plugin
Serverless: Load command plugin:search
Serverless: Load command emit
Serverless: Load command config
Serverless: Load command config:credentials
Serverless: Load command rollback
Serverless: Load command rollback:function
Serverless: Load command requirements
Serverless: Load command requirements:clean
Serverless: Load command requirements:install
Serverless: Invoke package
Serverless: Invoke aws:common:validate
Serverless: Invoke aws:common:cleanupTempDir
Serverless: Generating requirements.txt from Pipfile...
Serverless: Installing required Python packages with python3.6...
etc.