feat: convert python to a v2 tool

src/usr/local/buildpack/tools/v2/python.sh

@@ -0,0 +1,82 @@
+#!/bin/bash
+
+# sets the correct shebang for python
+fix_python_shebangs() {
+  # https://github.com/koalaman/shellcheck/wiki/SC2044
+  while IFS= read -r -d '' file
+  do
+    case "$(head -1 "${file}")" in
+    "#!"*"/bin/python" )
+      sed -i "1 s:.*:#\!${versioned_tool_path}\/bin\/python:" "${file}"
+      ;;
+    "#!"*"/bin/python${MAJOR}" )
+      sed -i "1 s:.*:#\!${versioned_tool_path}\/bin\/python${MAJOR}:" "${file}"
+      ;;
+    "#!"*"/bin/python${MAJOR}.${MINOR}" )
+      sed -i "1 s:.*:#\!${versioned_tool_path}\/bin\/python${MAJOR}.${MINOR}:" "${file}"
+      ;;
+    esac
+  done < <(find "${versioned_tool_path}/bin" -type f -exec grep -Iq . {} \; -print0)
+}
+
+function install_tool () {
+  local versioned_tool_path
+  local file
+  local url
+  local arch
+  local version_codename
+
+  # get semver -> major, minor, patch
+  check_semver "${TOOL_VERSION}"
+
+  versioned_tool_path=$(create_versioned_tool_path)
+  arch=$(uname -p)
+  url="https://github.com/containerbase/python-prebuild/releases/download"
+  version_codename=$(get_distro)
+
+  create_folder "${versioned_tool_path}/bin"
+
+  file=$(get_from_url "${url}/${TOOL_VERSION}/python-${TOOL_VERSION}-${version_codename}-${arch}.tar.xz")
+
+  if [[ -f ${file} ]]; then
+    echo 'Using prebuild python'
+    tar -C "${versioned_tool_path}" --strip 1 -xf "${file}"
+  else
+    echo 'No prebuild python found' >&2
+    exit 1
+  fi
+
+  fix_python_shebangs
+
+  # install latest pip
+  PYTHONHOME=${versioned_tool_path} "${versioned_tool_path}/bin/pip" install --upgrade pip
+
+  # clean cache https://pip.pypa.io/en/stable/reference/pip_cache/#pip-cache
+  PYTHONHOME=${versioned_tool_path} "${versioned_tool_path}/bin/pip" cache purge
+}
+
+function link_tool () {
+  local versioned_tool_path
+  versioned_tool_path=$(find_versioned_tool_path)
+
+  # get semver -> major, minor, patch
+  check_semver "${TOOL_VERSION}"
+
+  reset_tool_env
+
+  # export python vars
+  export_tool_env PYTHONHOME "${versioned_tool_path}"
+  export_tool_path "${versioned_tool_path}/bin"
+  export_tool_path "${USER_HOME}/.local/bin"
+
+  # TODO: fix me, currently required for global pip
+  shell_wrapper "${TOOL_NAME}" "${versioned_tool_path}/bin"
+  shell_wrapper "${TOOL_NAME}${MAJOR}" "${versioned_tool_path}/bin"
+  shell_wrapper "${TOOL_NAME}${MAJOR}.${MINOR}" "${versioned_tool_path}/bin"
+  shell_wrapper pip "${versioned_tool_path}/bin"
+  shell_wrapper "pip${MAJOR}" "${versioned_tool_path}/bin"
+  shell_wrapper "pip${MAJOR}.${MINOR}" "${versioned_tool_path}/bin"
+
+  python --version
+  pip --version
+}

test/bash/tools/python.bats

@@ -0,0 +1,155 @@
+setup_file () {
+  export TEST_DIR="$(cd "$(dirname "$BATS_TEST_FILENAME")" >/dev/null 2>&1 && pwd)"
+
+  # set up the cache
+  load "$TEST_DIR/../cache.sh"
+  export BUILDPACK_CACHE_DIR="$(create_temp_dir TEST_CACHE_DIR)"
+}
+
+setup() {
+  load '../../../node_modules/bats-support/load'
+  load '../../../node_modules/bats-assert/load'
+
+  TEST_ROOT_DIR=$(mktemp -u)
+
+  load "$TEST_DIR/../../../src/usr/local/buildpack/util.sh"
+
+  # load v2 overwrites
+  load "$TEST_DIR/../../../src/usr/local/buildpack/utils/v2/overrides.sh"
+
+  # load test overwrites
+  load "$TEST_DIR/../util.sh"
+
+  # set directories for test
+  ROOT_DIR="${TEST_ROOT_DIR}/root"
+  BIN_DIR="${TEST_ROOT_DIR}/bin"
+
+  setup_directories
+
+  # set default test user
+  TEST_ROOT_USER=1000
+
+  # load python
+  load "$TEST_DIR/../../../src/usr/local/buildpack/tools/v2/python.sh"
+
+}
+
+teardown() {
+    rm -rf "${TEST_ROOT_DIR}"
+}
+
+teardown_file () {
+  clean_temp_dir $BUILDPACK_CACHE_DIR TEST_CACHE_DIR
+}
+
+@test "python: check_tool_requirements" {
+  TOOL_NAME=python
+
+  TOOL_VERSION=foobar \
+  run check_tool_requirements
+  assert_failure
+
+  TOOL_VERSION=1.2.3 \
+  run check_tool_requirements
+  assert_success
+}
+
+@test "python: check_tool_installed" {
+  local TOOL_NAME=python
+  local TOOL_VERSION
+
+  # renovate: datasource=github-releases lookupName=containerbase/python-prebuild
+  TOOL_VERSION=3.10.5
+
+  run check_tool_installed
+  assert_failure
+
+  run install_tool
+  assert_success
+
+  run check_tool_installed
+  assert_success
+}
+
+@test "python: install_tool" {
+  local TOOL_NAME=python
+  local TOOL_VERSION
+
+  # renovate: datasource=github-releases lookupName=containerbase/python-prebuild
+  TOOL_VERSION=3.10.5
+
+  run install_tool
+  assert_success
+
+  local versioned_tool_path=$(find_versioned_tool_path)
+
+  PATH="${versioned_tool_path}/bin" \
+  run python --version
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+
+  # don't update
+  TOOL_VERSION=3.10.4
+
+  run install_tool
+  assert_success
+
+  local versioned_tool_path=$(find_versioned_tool_path)
+
+  PATH="${versioned_tool_path}/bin" \
+  run python --version
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+}
+
+@test "python: link_tool" {
+  local TOOL_NAME=python
+  local TOOL_VERSION
+  local bin_path=$(get_bin_path)
+
+  # renovate: datasource=github-releases lookupName=containerbase/python-prebuild
+  TOOL_VERSION=3.10.5
+
+  run install_tool
+  assert_success
+
+  PATH="${bin_path}:$PATH" \
+  run link_tool
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+
+  PATH="${bin_path}" \
+  run python --version
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+
+  local versioned_tool_path=$(find_versioned_tool_path)
+
+  PATH="${versioned_tool_path}/bin" \
+  run python --version
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+
+  # don't update
+  TOOL_VERSION=3.10.4
+
+  run install_tool
+  assert_success
+
+  PATH="${bin_path}:$PATH" \
+  run link_tool
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+
+  local versioned_tool_path=$(find_versioned_tool_path)
+
+  PATH="${versioned_tool_path}/bin" \
+  run python --version
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+
+  PATH="${bin_path}" \
+  run python --version
+  assert_success
+  assert_output --partial "${TOOL_VERSION}"
+}