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I inherited a docker containerized setup. Previous engineers maintaining it are long gone. When I try to build the image, it is complaining during installation of one of the packages specified in requirements.txt

requirements.txt contents:

setuptools==40.6.3
pip==1.5.4
paramiko==2.4.2
scp==0.13.0
timeout_decorator==0.4.1
requests==2.21.0
pylint==1.9.4
jsonschema==2.6.0
six==1.11.0
dnslib==0.9.10
SQLAlchemy==1.3.5
psycopg2==2.8.3
future==0.17.1
tenacity

Error seen during installation:

  Collecting lazy-object-proxy (from astroid<2.0,>=1.6->pylint==1.9.4->-r requirements.txt (line 7))
    Downloading https://files.pythonhosted.org/packages/6f/3e/7c80e8536b9d5eb66e784fff4c359adf9e55b37460fd6928192256ba71f2/lazy-object-proxy-1.7.0.tar.gz (42kB)
      Complete output from command python setup.py egg_info:
      Traceback (most recent call last):
        File "<string>", line 1, in <module>
        File "/tmp/pip-build-JMyxNe/lazy-object-proxy/setup.py", line 146, in <module>
          distclass=BinaryDistribution,
        File "/usr/lib/python2.7/dist-packages/setuptools/__init__.py", line 128, in setup
          _install_setup_requires(attrs)
        File "/usr/lib/python2.7/dist-packages/setuptools/__init__.py", line 123, in _install_setup_requires
          dist.fetch_build_eggs(dist.setup_requires)
        File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 513, in fetch_build_eggs
          replace_conflicting=True,
        File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 774, in resolve
          replace_conflicting=replace_conflicting
        File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1057, in best_match
          return self.obtain(req, installer)
        File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1069, in obtain
          return installer(requirement)
        File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 580, in fetch_build_egg
          return cmd.easy_install(req)
        File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 698, in easy_install
          return self.install_item(spec, dist.location, tmpdir, deps)
        File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 724, in install_item
          dists = self.install_eggs(spec, download, tmpdir)
        File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 909, in install_eggs
          return self.build_and_install(setup_script, setup_base)
        File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 1177, in build_and_install
          self.run_setup(setup_script, setup_base, args)
        File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 1163, in run_setup
          run_setup(setup_script, args)
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 253, in run_setup
          raise
        File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
          self.gen.throw(type, value, traceback)
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 195, in setup_context
          yield
        File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
          self.gen.throw(type, value, traceback)
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 166, in save_modules
          saved_exc.resume()
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 141, in resume
          six.reraise(type, exc, self._tb)
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 154, in save_modules
          yield saved
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 195, in setup_context
          yield
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 250, in run_setup
          _execfile(setup_script, ns)
        File "/usr/lib/python2.7/dist-packages/setuptools/sandbox.py", line 44, in _execfile
          code = compile(script, filename, 'exec')
        File "/tmp/easy_install-bKS9kl/setuptools_scm-7.0.5/setup.py", line 20
          def scm_version() -> str:
                            ^
      SyntaxError: invalid syntax

----------------------------------------
[91mCommand "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-JMyxNe/lazy-object-proxy/

I am confused where exactly to fix this issue. I know that it is using python 2.7 which is not supported but bringing entire project to python 3+ is not ideal at this time. I believed the packages and their versions below should work with python 2.7 as it has been all this time until I deleted the image. How can I fix this issue?

Akshay Jagtap
  • 47
  • 9

1 Answers1

1

TL;DR: Try adding setuptools-stm=5.0.2 to requirements.txt.

At least some of the project is attempting to use Python 3.

File "/tmp/easy_install-bKS9kl/setuptools_scm-7.0.5/setup.py", line 20
  def scm_version() -> str:

This line, def scm_version() -> str: is using type hinting introduced in Python 3.5.

It looks like this is coming from setuptools-scm. 7.0.5 is the latest version.

I think this is happening as pylint is being installed, based on the info on the first line of your traceback, as an automatic dependency installation. You could try pinning setuptools-stm=5.0.2 as a requirement, since that is the last version that supports Python 2.

It might work. If it does, there's no guarantee that something else won't be broken. You may need to pin other requirements (like tenacity, which has no pinned version).

That's my best suggestion!

D. Hammaker
  • 81
  • 6