When updating pip via puppet-python, an error occurs.

[pillarsdotnet]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 6.4.2
• Ruby: ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-linux]
• Distribution: CentOS Linux release 7.6.1810 (Core)
• Module version: master

How to reproduce (e.g Puppet code you use)

What are you seeing

$ grep -A5 python: data/app/pup.yaml
python::python_pips:
  pip:        { ensure: 'latest' }
  pre-commit: { ensure: 'latest' }
  setuptools: { ensure: 'latest' }
  wheel:      { ensure: 'latest' }

$ /opt/puppetlabs/bin/puppet agent -t
Info: Using configured environment 'dev'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Retrieving locales
Info: Loading facts
Error: Facter: error while resolving custom fact "pip_version": undefined method `[]' for nil:NilClass
Info: Caching catalog for cusppupent01.internal.cnngad.com
Info: Applying configuration version '1558463440'
Notice: System Reboot Required Because:
  audit => modified
Notice: Applied catalog in 25.40 seconds
$ which pre-commit
/usr/bin/which: no pre-commit in (/usr/local/openssl/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/opt/puppetlabs/bin:/opt/puppetlabs/puppet/bin)

What behaviour did you expect instead

Successful installation of pip, setuptools, wheel, and pre-commit

Output log

See above.

Any additional information you'd like to impart

Possibly related: pre-commit/pre-commit#1039

[pillarsdotnet]

Apparently, I must install the python-setuptools rpm before installing the setuptools pip, else it will fail silently.