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#!/bin/bash
# @author: <sylvain.herledan@hrafnagud.info>
# @date: 2017-06-06
set -o nounset
set -o errexit
set -o pipefail
readonly PROGNAME="$(basename "${0}")";
readonly PROGDIR="$(readlink -f "$(dirname "${0}")")";
readonly ARGS="${@}";
readonly PYTHON_VERSION_PATH="$(mktemp)";
readonly PIP_INSTALL_SCRIPT="$(mktemp)";
cleanup()
{
local rc=$?; # Keep original return code
rm -f "${PYTHON_VERSION_PATH}"
rm -f "${PIP_INSTALL_SCRIPT}"
exit ${rc}
}
get_python_version()
{
local python="${1}"; shift;
local version_path="${1}"; shift;
# Redirecting stderr to stdout is necessary because older versions
# of Python printed to stderr
"${python}" --version 2>&1 \
| cut -d\ -f2 \
> "${version_path}"
}
venv_install_method()
{
local python="${1}"; shift;
local env_dir="${1}"; shift;
"${python}" -m venv "${env_dir}"
set +o nounset
source "${env_dir}/bin/activate"
set -o nounset
pip install --upgrade pip
set +o nounset
deactivate
set -o nounset
}
pip_install_method()
{
local python="${1}"; shift;
local env_dir="${1}"; shift;
local num="${1}"; shift;
local opts='';
wget 'https://bootstrap.pypa.io/get-pip.py' \
-O "${PIP_INSTALL_SCRIPT}"
"${python}" "${PIP_INSTALL_SCRIPT}" --isolated \
--prefix=${env_dir} \
--ignore-installed \
--no-cache
# WARNING: for some reason it is not possible to force
# the script to build from source (with --no-binary setuptools,pip)
# due to an unsupported --no-user option in the install procedure.
# So it is better to check that the installed binary is compatible
# with the local system (notably the SSL library which may cause
# issues when downloading packages from HTTPS).
}
install_environment()
{
get_python_version "${python}" "${PYTHON_VERSION_PATH}"
local major="$(cat "${PYTHON_VERSION_PATH}" | cut -d. -f1)";
local minor="$(cat "${PYTHON_VERSION_PATH}" | cut -d. -f2)";
local num=$((${minor} + 10 * ${major}));
if [ ${num} -gt 33 ];
then
set +o errexit
"${python}" -m ensurepip --help 2>&1 >/dev/null
local rc=$?
set -o errexit
if [ 0 -eq ${rc} ];
then
venv_install_method "${python}" "${env_dir}"
else
pip_install_method "${python}" "${env_dir}" "${num}"
install_virtualenv "${python}" "${env_dir}"
fi
elif [ ${num} -eq 27 ];
then
pip_install_method "${python}" "${env_dir}" "${num}"
install_virtualenv "${python}" "${env_dir}"
else
>&2 echo "Unsupported Python version"
exit 1
fi
mkdir -p "${env_dir}/cache"
cat > "${env_dir}/pip.conf" << EOF
[global]
cache-dir=${env_dir}/cache
EOF
}
install_virtualenv()
{
local python="${1}"; shift;
local env_dir="${1}"; shift;
local _pkg_dir="$(find "${env_dir}/lib" -mindepth 2 -maxdepth 2 \
-name "site-packages")";
local pkg_dir="$(readlink -f "${_pkg_dir}")";
echo "Install virtual env"
# Install virtualenv
PYTHONPATH="${pkg_dir}" \
"${env_dir}/bin/pip" install --prefix="${env_dir}" \
--ignore-installed \
--no-cache \
--no-binary virtualenv \
virtualenv
PIP_CACHE_DIR="${env_dir}/cache" \
PIP_IGNORE_INSTALLED=true \
PYTHONPATH="${pkg_dir}" \
"${python}" -m virtualenv "${env_dir}"
}
main()
{
local python="${1}"; shift;
local _install_dir="${1}"; shift;
local install_dir="$(readlink -f "${_install_dir}")";
local env_dir="${install_dir}/env";
trap 'cleanup' INT TERM EXIT
install_environment "${python}" "${env_dir}"
trap - INT TERM EXIT
echo 'Environment ready'
}
main ${ARGS}
exit 0
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