Add script to create a Python virtualenv properly isolated from the system.

1 files changed, 60 insertions, 0 deletions

diff --git a/python_install.sh b/python_install.sh
new file mode 100755
index 0000000..c92e7c5
--- /dev/null
+++ b/python_install.sh
@@ -0,0 +1,60 @@
+#!/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 "${0}")")";
+readonly ARGS="${@}";
+
+install_virtualenv()
+{
+  local python="${1}"; shift;
+  local env_dir="${1}"; shift;
+  local install_script_path="$(mktemp)";
+
+  wget 'https://bootstrap.pypa.io/get-pip.py' -O "${install_script_path}"
+
+  mkdir -p "${env_dir}"
+
+  PYTHONUSERBASE="${env_dir}" \
+  "${python}" "${install_script_path}" --user --ignore-installed --no-cache
+  rm -f "${install_script_path}"
+
+  PYTHONUSERBASE="${env_dir}" \
+  "${env_dir}/bin/pip" install --user --ignore-installed --no-cache virtualenv
+
+  local virtualenv_path="$(find "${env_dir}/lib" -name 'virtualenv.py')";
+  local python_pkg_dir="$(readlink -f "$(dirname "${virtualenv_path}")")";
+
+  mkdir -p "${env_dir}/cache"
+
+  PIP_CACHE_DIR="${env_dir}/cache" \
+  PIP_IGNORE_INSTALLED=true \
+  PYTHONPATH="${python_pkg_dir}" \
+  "${python}" -m virtualenv "${env_dir}"
+
+  cat > "${env_dir}/pip.conf" << EOF
+[global]
+cache-dir=${env_dir}/cache
+EOF
+
+  echo 'Environment ready'
+}
+
+main()
+{
+  local python="${1}"; shift;
+  local _install_dir="${1}"; shift;
+  local install_dir="$(readlink -f "${_install_dir}")";
+  local env_dir="${install_dir}/env";
+
+  install_virtualenv "${python}" "${env_dir}"
+}
+
+main ${ARGS}
+exit 0