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I have the below docker file, base image rundeckpro/runner:latest; it has no python installed. After the image is built, there are two versions of python: both python3.10 and python3.11, even though I requested only python3.11. Is there any reason for this, and can I avoid this?

ARG RUNNER_VERSION=latest
FROM rundeckpro/runner:${RUNNER_VERSION}

ARG PYTHON_VERSION=python3.11
ARG DEBIAN_FRONTEND=noninteractive

USER root

RUN apt-get update && \
    apt-get install -y --no-install-recommends software-properties-common && \
    apt-get install -y --no-install-recommends gpg-agent && \
    add-apt-repository -y ppa:deadsnakes/ppa && \
    apt-get install -y --no-install-recommends $PYTHON_VERSION && \
    apt-get install -y --no-install-recommends $PYTHON_VERSION-venv && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.11 1    

USER runner
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1 Answer 1

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9

rundeckpro/runner is currently based on Ubuntu 22.04, and the default version of Python in 22.04 is 3.10. software-properties-common depends on Python, so installing that ends up installing python3.10.

Since you only need software-properties-common to install the deadsnakes PPA, you can remove it after installing the PPA:

RUN apt-get update && \
    apt-get install -y --no-install-recommends software-properties-common gpg-agent && \
    add-apt-repository -y ppa:deadsnakes/ppa && \
    apt-get purge -y --autoremove software-properties-common gpg-agent && \
    apt-get install -y --no-install-recommends $PYTHON_VERSION && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

This will give you python3.11 but not python3.10.

Unfortunately python3.11-venv, even in the deadsnakes PPA, depends on python3-distutils, which pulls in python3 and thus python3.10.

Also, don’t bother with alternatives, the Python packages don’t use them; if you want python3, link it:

ln -sf python3.11 /usr/bin/python3

(but note that if the python3 package is installed, this is liable to break things — if a package requires the python3 package, you should leave the symlink alone, and use python3.11 explicitly).

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  • You are right about software-properties-common dependency on python3.10. It did not resolve d my issue, when i tried running each step individually apt-get install -y --no-install-recommends python3.11 python3.11-venv installs the python3.10 python3.10-minimal python3.11-minimal Commented Jul 13, 2023 at 14:03
  • 2
    Ah yes, apologies, I’d noted that python3.10 wasn’t installed after installing python3.11, but python3.11-venv pulls it in. Commented Jul 13, 2023 at 16:23

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