Installing ruamel.yaml.clib with docker-CodePudding

I have a small project in django rest framework and I want to dockerize it. In my requirements.txt file there is a package called ruamel.yaml.clib==0.2.6. While downloading all other requirements is successfull, there is a problem when it tries to download this package.

#11 208.5 Collecting ruamel.yaml.clib==0.2.6
#11 208.7   Downloading ruamel.yaml.clib-0.2.6.tar.gz (180 kB)
#11 217.8     ERROR: Command errored out with exit status 1:
#11 217.8      command: /usr/local/bin/python -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-b8oectgw/ruamel-yaml-clib_517e9b3f18a94ebea71ec88fbaece43a/setup.py'"'"'; __file__='"'"'/tmp/pip-install-b8oectgw/ruamel-yaml-clib_517e9b3f18a94ebea71ec88fbaece43a/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-n2gr5j35
#11 217.8          cwd: /tmp/pip-install-b8oectgw/ruamel-yaml-clib_517e9b3f18a94ebea71ec88fbaece43a/
#11 217.8     Complete output (3 lines):
#11 217.8     sys.argv ['/tmp/pip-install-b8oectgw/ruamel-yaml-clib_517e9b3f18a94ebea71ec88fbaece43a/setup.py', 'egg_info', '--egg-base', '/tmp/pip-pip-egg-info-n2gr5j35']
#11 217.8     test compiling /tmp/tmp_ruamel_erx3efla/test_ruamel_yaml.c -> test_ruamel_yaml compile error: /tmp/tmp_ruamel_erx3efla/test_ruamel_yaml.c
#11 217.8     Exception: command 'gcc' failed: No such file or directory
#11 217.8     ----------------------------------------
#11 217.8 WARNING: Discarding https://files.pythonhosted.org/packages/8b/25/08e5ad2431a028d0723ca5540b3af6a32f58f25e83c6dda4d0fcef7288a3/ruamel.yaml.clib-0.2.6.tar.gz#sha256=4ff604ce439abb20794f05613c374759ce10e3595d1867764dd1ae675b85acbd (from https://pypi.org/simple/ruamel-yaml-clib/) (requires-python:>=3.5). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
#11 217.8 ERROR: Could not find a version that satisfies the requirement ruamel.yaml.clib==0.2.6 (from versions: 0.1.0, 0.1.2, 0.2.0, 0.2.2, 0.2.3, 0.2.4, 0.2.6)
#11 217.8 ERROR: No matching distribution found for ruamel.yaml.clib==0.2.6

However, there is no problem when I download this package without docker. Any suggestions?

Here is Dockerfile:

    FROM python:3-alpine

    # set work directory
    WORKDIR /usr/src/app

    # set environment variables
    ENV PYTHONDONTWRITEBYTECODE 1
    ENV PYTHONUNBUFFERED 1

    # install dependencies

    RUN pip install -U pip setuptools wheel ruamel.yaml ruamel.yaml.clib==0.2.6
    COPY ./requirements.txt .
    RUN pip install --default-timeout=100 -r requirements.txt

    # copy project
    COPY . .

Here is compose file

    version: '3.8'
  
    services: 
      web:
        build: .
        command: python manage.py runserver 0.0.0.0:8000
        volumes:
          - .:/usr/src/app
        ports: 
          - 8000:8000
        env_file: 
          - ./.env.dev

EDIT

As mentioned in comments by @Anthon, the problem was related to alpine. I used python:3.9-slim-buster instead in Dockerfile and problem solved!

CodePudding user response：

I think the problem is with the way your Dockerfile tries to install ruamel.yaml.clib. It should be installed using pip (just as documented for the ruamel.yaml).

I suggest you take it out of the requirements.txt and explicitly do a

 pip install -U pip setuptools wheel ruamel.yaml.clib==0.2.6

in your Dockerfile instead. This should just get you the pre-compiled wheel instead of trying to compile ruamel.yaml.clib from source, which will not work if you don't have a C compiler installed (this is actually what docker complains about)

I have ruamel.yaml.clib running succesfully in multiple Docker containers (but I never use a requirements.txt)