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[Akihiro Motoki <1866961@xxxxxxxxxxxxxxxxxx>]

horizon has fixed the issue but unfortunately the fixes are not linked with it. I am summarizing the fixes.
Multiple fixes are involved in the master branch (i.e. ussuri), so fixes in the stable/train branch would be better for the summary.

The related fixes in stable/train are as follows:
- 9813577f7d0137da0e29c7630cffc3e1e1b329f5 (Update pyScss to 1.3.7)
- f26c88721614d1c25bcd26740b8fb20a7a97bd05 (Implement 'selector-append' sass function) which fixes an problem in the material design with pyScss 1.3.5 or later.

They were backported to stable/stein too.

Regarding stable/rocky or older branches, we don't backport them from the following reasons:
- The CI jobs are not broken as they use setuptools<46.
- It is better to avoid requirements change as much as possible.
- stable/rocky and older branches are in the extended maintenance phase so the upstream development team does not focus on them much.

** Changed in: horizon
   Importance: Undecided => Critical

** Changed in: horizon
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1866961

Title:
  ImportError: cannot import name 'Feature'

Status in devstack:
  Invalid
Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in kolla:
  Fix Released
Status in kolla train series:
  Fix Committed
Status in kolla ussuri series:
  Fix Released

Bug description:
  One of Horizon's requirements is pyscss package. Which had last
  release over 4 years ago...

  Two days ago setuptools v46 got released. One of changes was drop of
  Features feature.

  Now Kolla builds fail:

  INFO:kolla.common.utils.horizon:Collecting pyScss===1.3.4
  INFO:kolla.common.utils.horizon:  Downloading http://mirror.ord.rax.opendev.org:8080/pypifiles/packages/1d/4a/221ae7561c8f51c4f28b2b172366ccd0820b14bb947350df82428dfce381/pyScss-1.3.4.tar.gz (120 kB)
  INFO:kolla.common.utils.horizon:    ERROR: Command errored out with exit status 1:
  INFO:kolla.common.utils.horizon:     command: /var/lib/kolla/venv/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-rr0db3qs/pyScss/setup.py'"'"'; __file__='"'"'/tmp/pip-install-rr0db3qs/pyScss/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-rr0db3qs/pyScss/pip-egg-info
  INFO:kolla.common.utils.horizon:         cwd: /tmp/pip-install-rr0db3qs/pyScss/
  INFO:kolla.common.utils.horizon:    Complete output (5 lines):
  INFO:kolla.common.utils.horizon:    Traceback (most recent call last):
  INFO:kolla.common.utils.horizon:      File "<string>", line 1, in <module>
  INFO:kolla.common.utils.horizon:      File "/tmp/pip-install-rr0db3qs/pyScss/setup.py", line 9, in <module>
  INFO:kolla.common.utils.horizon:        from setuptools import setup, Extension, Feature
  INFO:kolla.common.utils.horizon:    ImportError: cannot import name 'Feature'

  Devstack also has the same problem.

  Are there any plans to fix it?

  pyscss project got issue: https://github.com/Kronuz/pyScss/issues/385

  
  What are plans of Horizon team?

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