Cloud Build fails to build App Engine Python 3.8 app (due to pip bug?)

Also posted on StackOverflow.

I have a number of Python 3.7 apps on Google App Engine standard, all building and deploying fine. I’m trying to upgrade some of them to the new Python 3.8 runtime, but when I try to deploy, they fail in Cloud Build.

It looks like they’re hitting this open pip bug (more background). Odd that only the Python 3.8 runtime triggers this bug, though, and 3.7 builds fine.

Full log below. (Note that it’s happening in Cloud Build, not my local machine, so I can’t upgrade pip or otherwise change any of the commands or environment.) Anyone know how I can fix or work around this?

File upload done.
Updating service [default]...failed.
ERROR: ( Error Response: [9] Cloud build 83e346a0-7e88-43dd-b89c-a4820526e4a1 status: FAILURE
Error ID: f8df99ad
Error type: INTERNAL
Error message: ... ( started
  Building wheel for webapp2 ( finished with status 'done'
  Created wheel for webapp2: filename=webapp2-3.0.0b1-py3-none-any.whl size=68362 sha256=9dd9f3ab6a55404492a88eb9a6bacb00faa37efafbc41f21a24d21cfba0eaea3
  Stored in directory: /layers/google.python.pip/pipcache/wheels/55/e9/4d/76b030f418cac0bef4a3dcc15ca95c9671f1e826731ce2bc0f
  Building wheel for tlslite-ng ( started
  Building wheel for tlslite-ng ( finished with status 'done'
  Created wheel for tlslite-ng: filename=tlslite_ng-0.7.5-py3-none-any.whl size=199869 sha256=b9ead00f0832041fba1e9d3883e57847995c2d6f83ecb7ea87d09cf82c730e8b
  Stored in directory: /layers/google.python.pip/pipcache/wheels/a6/e1/a6/09610854c3405202d0b71d8f869811781e40cd26ffb85eacf8
Successfully built gdata humanize mf2py mf2util python-tumblpy ujson webapp2 tlslite-ng
Installing collected packages: six, ecdsa, tlslite-ng, lxml, gdata, certifi, urllib3, chardet, idna, requests, setuptools, protobuf, googleapis-common-protos, pyasn1, pyasn1-modules, rsa, cachetools, google-auth, pytz, grpcio, google-api-core, google-cloud-core, google-cloud-logging, gunicorn, pbr, extras, linecache2, traceback2, python-mimeparse, argparse, unittest2, testtools, fixtures, mox3, soupsieve, beautifulsoup4, gdata-python3, redis, google-cloud-datastore, google-cloud-ndb, humanize, MarkupSafe, jinja2, webencodings, html5lib, mf2py, mf2util, oauthlib, prawcore, websocket-client, update-checker, praw, requests-oauthlib, python-tumblpy, tweepy, ujson, webob, webapp2, oauth-dropins
  Running develop for oauth-dropins
    ERROR: Command errored out with exit status 1:
     command: /opt/python3.8/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/workspace/'"'"'; __file__='"'"'/workspace/'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);'"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' develop --no-deps --home /tmp/pip-target-zp53suvg
         cwd: /workspace/
    Complete output (6 lines):
    usage: [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
       or: --help [cmd1 cmd2 ...]
       or: --help-commands
       or: cmd --help

    error: option --home not recognized
ERROR: Command errored out with exit status 1: /opt/python3.8/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/workspace/'"'"'; __file__='"'"'/workspace/'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);'"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' develop --no-deps --home /tmp/pip-target-zp53suvg Check the logs for full command output.
WARNING: You are using pip version 20.1.1; however, version 20.2.2 is available.
You should consider upgrading via the '/opt/python3.8/bin/python3 -m pip install --upgrade pip' command.
Full build logs:

Here’s my requirements.txt file. I suspect the -e . might be the problem…but it works with Python 3.7, so if so, that’s disappointing.


# this includes everything in's install_requires.
-e .

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