CI error: pip not installed on 2.7

[eddiewebb]

Very odd. Running a 2.7 build locally or on CIrcle fails, python:3.6 seems to work fine.

$ circleci build -c 2dotoh.yml --job codespell
Docker image digest: sha256:81eaab60f3118a29f49ba42229c9a918d792bce8e75e2b2443e4042db932ac87
====>> Spin up Environment
Build-agent version 1.0.18380-12161d8b (2019-11-04T17:44:02+0000)
Docker Engine Version: 19.03.5
Kernel Version: Linux 368961b4dd9b 4.9.184-linuxkit #1 SMP Tue Jul 2 22:58:16 UTC 2019 x86_64 Linux
Starting container cimg/python:2.7
  using image cimg/python@sha256:20752b5f66dd6e0447217385eca897649dbc180b96ddf5f1c3792386c06509f3

Using build environment variables
  BASH_ENV=/tmp/.bash_env-localbuild-1576771155
  CI=true
  CIRCLECI=true
  CIRCLE_BRANCH=patch-1
  CIRCLE_BUILD_NUM=
  CIRCLE_JOB=codespell
  CIRCLE_NODE_INDEX=0
  CIRCLE_NODE_TOTAL=1
  CIRCLE_REPOSITORY_URL=git@github.com:eddiewebb/trinity.git
  CIRCLE_SHA1=83ce3cc41ea295a414d211bbd283905665fdc7d1
  CIRCLE_SHELL_ENV=/tmp/.bash_env-localbuild-1576771155
  CIRCLE_WORKING_DIRECTORY=~/project


The redacted variables listed above will be masked in run step output

====>> Checkout code
  #!/bin/bash -eo pipefail
mkdir -p /root/project && cd /tmp/_circleci_local_build_repo && git ls-files | tar -T - -c | tar -x -C /root/project && cp -a /tmp/_circleci_local_build_repo/.git /root/project
====>> install codespell
  #!/bin/bash -eo pipefail
pip install codespell
/bin/bash: pip: command not found
Error: Exited with code 127
Step failed

but manually invoking container passes

Development/trinity on patch-1* : [10:34:31]
$ docker run -it cimg/python:2.7 bash
Unable to find image 'cimg/python:2.7' locally
2.7: Pulling from cimg/python
5667fdb72017: Pull complete 
d83811f270d5: Pull complete 
ee671aafb583: Pull complete 
7fc152dfb3a6: Pull complete 
e4ca174ff71e: Pull complete 
ec7d07481cdc: Pull complete 
38808d14ffdd: Pull complete 
0f3f034efc2b: Pull complete 
5ab14eaa35bf: Pull complete 
173f3617fc64: Pull complete 
7f41c24f015d: Pull complete 
Digest: sha256:20752b5f66dd6e0447217385eca897649dbc180b96ddf5f1c3792386c06509f3
Status: Downloaded newer image for cimg/python:2.7

root@68a64a2e5cee:~/project# pip install codespell
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting codespell
  Downloading https://files.pythonhosted.org/packages/df/6f/764ca059e0eb06b69e1abed2c9a2cabe7dac72b336e2600615b38ea547a3/codespell-1.16.0.tar.gz (134kB)
     |################################| 143kB 1.2MB/s 
Installing collected packages: codespell
  Running setup.py install for codespell ... done
Successfully installed codespell-1.16.0
WARNING: You are using pip version 19.2.3, however version 19.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

[FelicianoTech]

There seems to be a PATH issue with regard to interactive vs non-interactive Bash sessions here. Investigating.

The Dockerfile itself checks pip before finishing so strange:

cimg-python/Dockerfile.template

Line 38 in dfe8efa

pip --version

[eddiewebb]

🎉

[wyardley]

It also doesn't seem to be in root's $PATH, even in an interactive session

circleci@78b8e0c69367:~/project$ pip --version
pip 19.2.3 from /home/circleci/.pyenv/versions/3.7.7/lib/python3.7/site-packages/pip (python 3.7)
circleci@78b8e0c69367:~/project$ sudo pip --version
sudo: pip: command not found
circleci@78b8e0c69367:~/project$ sudo su - 
root@78b8e0c69367:~# pip --version
-su: pip: command not found
root@78b8e0c69367:~# logout
circleci@78b8e0c69367:~/project$ which pip
/home/circleci/.pyenv/shims/pip

pip does work as the circleci user, but was still confusing, especially since Circle's example docs suggest using sudo pip install pipenv (https://circleci.com/docs/2.0/language-python/#cache-dependencies)