diskimage-builder/diskimage_builder/elements/dib-python/pre-install.d/01-dib-python

#!/bin/bash

if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

if [[ ${DISTRO_NAME} =~ (centos|rhel) && ${DIB_RELEASE} > 7 ]]; then
    # RHEL8 has a system python, separate from the user python.  What
    # a good idea, abstracting the python binary for system scripts!
    # :)  Use it for dib-python.
    python_path=/usr/libexec/platform-python
elif [[ ${DISTRO_NAME} =~ (debian) && ${DIB_PYTHON_VERSION} == 3 ]]; then
    apt-get install -y python3
    python_path=$(command -v python${DIB_PYTHON_VERSION})
else
    python_path=$(command -v python${DIB_PYTHON_VERSION})
fi

if [ -z "$python_path" ]; then
    echo "Could not find python${DIB_PYTHON_VERSION} executable."
    exit 1
fi

ln -sf $python_path /usr/local/bin/dib-python