Installing conu from PyPi failed.

[phracek]

In our GitLab ansible script, we are trying to install conu from PyPi, but it failed on dependency on cryptography

- name: Install docker-squash and conu from PyPi and enable it for root
  shell: |
    [ -d /usr/local/python36-tools ] || scl enable rh-python36 -- virtualenv --python python3 /usr/local/python36-tools
    . /usr/local/python36-tools/bin/activate
    pip install docker-squash conu

The failure is:

"Collecting zipp>=0.5 (from importlib-metadata>=0.12; python_version < \"3.8\"->pytest->conu)"
"  Downloading https://files.pythonhosted.org/packages/0f/8c/715c54e9e34c0c4820f616a913a7de3337d0cd79074dd1bed4dd840f16ae/zipp-3.4.1-py3-none-any.whl"
"Collecting pyasn1-modules>=0.2.1 (from google-auth>=1.0.1->kubernetes==8.0.0->conu)"
"  Downloading https://files.pythonhosted.org/packages/95/de/214830a981892a3e286c3794f41ae67a4495df1108c3da8a9f62159b9a9d/pyasn1_modules-0.2.8-py2.py3-none-any.whl (155kB)"
"Collecting cachetools<5.0,>=2.0.0 (from google-auth>=1.0.1->kubernetes==8.0.0->conu)"
"  Downloading https://files.pythonhosted.org/packages/bb/72/8df2e0dc991f1a1d2c6869404e7622e8ee50d80bff357dbb57c3df70305b/cachetools-4.2.1-py3-none-any.whl"
"Collecting rsa<5,>=3.1.4; python_version >= \"3.6\" (from google-auth>=1.0.1->kubernetes==8.0.0->conu)"
"  Downloading https://files.pythonhosted.org/packages/e9/93/0c0f002031f18b53af7a6166103c02b9c0667be528944137cc954ec921b3/rsa-4.7.2-py3-none-any.whl"
"Collecting oauthlib>=3.0.0 (from requests-oauthlib->kubernetes==8.0.0->conu)"
"  Downloading https://files.pythonhosted.org/packages/05/57/ce2e7a8fa7c0afb54a0581b14a65b56e62b5759dbc98e80627142b8a3704/oauthlib-3.1.0-py2.py3-none-any.whl (147kB)"
"Collecting cryptography>=1.1.0 (from adal>=1.0.2->kubernetes==8.0.0->conu)"
"  Downloading https://files.pythonhosted.org/packages/9b/77/461087a514d2e8ece1c975d8216bc03f7048e6090c5166bc34115afdaa53/cryptography-3.4.7.tar.gz (546kB)"
"    Complete output from command python setup.py egg_info:"
"    "
"            =============================DEBUG ASSISTANCE=========================="
"            If you are seeing an error here please try the following to"
"            successfully install cryptography:"
"    "
"            Upgrade to the latest pip and try again. This will fix errors for most"
"            users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip"
"            =============================DEBUG ASSISTANCE=========================="
"    "
"    Traceback (most recent call last):"
"      File \"<string>\", line 1, in <module>"
"      File \"/tmp/pip-build-yigtemwf/cryptography/setup.py\", line 14, in <module>"
"        from setuptools_rust import RustExtension"
"    ModuleNotFoundError: No module named 'setuptools_rust'"
"    "

[phracek]

Some reference issue pyca/cryptography#5810