[now dev] fails with @now/python on Debian/Ubuntu

Ubuntu, since Xenial, contains the patched version of pip with --user and --ignore-installed flag active by default. In combination with the --prefix option, from the @now/python runtime, this always raises an error distutils.errors.DistutilsOptionError: can't combine user with prefix, exec_prefix/home, or install_(plat)base.

This can be solved by running now dev as a superuser or using the non-system version of pip.

For solving this in the runtime either --system or --no-user (depends on pip version) option must be provided. However, export PIP_USER=0 PIP_IGNORE_INSTALLED=0 seems more applicable.

There are also similar issues: #3023 and #2853

[numrut]

Please try this:

FROM ubuntu:latest

RUN apt-get update && apt-get install -y python3-pip

RUN useradd -m user && \
  su - user -c "pip3 install --disable-pip-version-check --target . --upgrade Flask"

[styfle]

I was unable to reproduce this bug with ubuntu xenial.

Here’s what I tried:

FROM ubuntu:xenial
RUN apt-get update && \
  apt-get install python3 python3-pip && \
  pip3 --version &&
  echo 'Flask==1.0.3' > requirements.txt && \
  pip3 install --disable-pip-version-check --target . --upgrade -r requirements.txt

The pip version was 8.1.1