configure

#!/usr/bin/env bash
#
# Copyright (c) nexB Inc. and others. All rights reserved.
# SPDX-License-Identifier: Apache-2.0 AND MIT
# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
# ScanCode is a trademark of nexB Inc.
# See https://github.com/nexB/ for support or download.
# See https://aboutcode.org for more information about nexB OSS projects.
#

set -e
#set -x

###################################################################################
###################################################################################
# from https://raw.githubusercontent.com/mkropat/sh-realpath/58c03982cfd8accbcf0c4426a4adf0f120a8b2bb/realpath.sh
# realpath emulation for portability on *nix
# this allow running scancode from arbitrary locations and from symlinks
#
# Copyright (c) 2014 Michael Kropat
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.


realpath() {
    canonicalize_path "$(resolve_symlinks "$1")"
}

resolve_symlinks() {
    _resolve_symlinks "$1"
}

_resolve_symlinks() {
    _assert_no_path_cycles "$@" || return

    local dir_context path
    path=$(readlink -- "$1")
    if [ $? -eq 0 ]; then
        dir_context=$(dirname -- "$1")
        _resolve_symlinks "$(_prepend_dir_context_if_necessary "$dir_context" "$path")" "$@"
    else
        printf '%s\n' "$1"
    fi
}

_prepend_dir_context_if_necessary() {
    if [ "$1" = . ]; then
        printf '%s\n' "$2"
    else
        _prepend_path_if_relative "$1" "$2"
    fi
}

_prepend_path_if_relative() {
    case "$2" in
        /* ) printf '%s\n' "$2" ;;
         * ) printf '%s\n' "$1/$2" ;;
    esac
}

_assert_no_path_cycles() {
    local target path

    target=$1
    shift

    for path in "$@"; do
        if [ "$path" = "$target" ]; then
            return 1
        fi
    done
}

canonicalize_path() {
    if [ -d "$1" ]; then
        _canonicalize_dir_path "$1"
    else
        _canonicalize_file_path "$1"
    fi
}

_canonicalize_dir_path() {
    (cd "$1" 2>/dev/null && pwd -P)
}

_canonicalize_file_path() {
    local dir file
    dir=$(dirname -- "$1")
    file=$(basename -- "$1")
    (cd "$dir" 2>/dev/null && printf '%s/%s\n' "$(pwd -P)" "$file")
}

###################################################################################
###################################################################################

# Now run configure proper

################################
# Setup current directory where this script lives
CFG_BIN="$( realpath "${BASH_SOURCE[0]}" )"
CFG_ROOT_DIR="$( cd "$( dirname "${CFG_BIN}" )" && pwd )"

CFG_BIN_DIR=$CFG_ROOT_DIR/$VIRTUALENV_DIR/bin

# force relaunching under X86-64 architecture on macOS M1/ARM 
if [[ $OSTYPE == 'darwin'* && $(uname -m) == 'arm64' && $(sysctl -in sysctl.proc_translated) == 0 ]]; then
    arch -x86_64 /bin/bash -c "$CFG_ROOT_DIR/configure $*"
    exit $?
fi

################################
# A configuration script to set things up:
# create a virtualenv and install or update thirdparty packages.
# Source this script for initial configuration
# Use configure --help for details
#
# NOTE: please keep in sync with Windows script configure.bat
#
# This script will search for a virtualenv.pyz app in etc/thirdparty/virtualenv.pyz
# Otherwise it will download the latest from the VIRTUALENV_PYZ_URL default
################################
CLI_ARGS=$1

################################
# Defaults. Change these variables to customize this script
################################

BASE=".[packages]"
BASE_DEV=".[packages,testing]"
if [[ $OSTYPE == 'darwin'* ]]; then
    BASE="."
    BASE_DEV=".[testing]"
fi

# Requirement arguments passed to pip and used by default or with --dev.
REQUIREMENTS="--editable $BASE --constraint requirements.txt --constraint requirements-linux.txt"
DEV_REQUIREMENTS="--editable $BASE_DEV --constraint requirements.txt --constraint requirements-linux.txt --constraint requirements-dev.txt"
DOCS_REQUIREMENTS="--editable .[docs] --constraint requirements.txt"
REL_REQUIREMENTS="--requirement etc/scripts/requirements.txt"
PROD_REQUIREMENTS="scancode_toolkit*.whl"

# where we create a virtualenv
VIRTUALENV_DIR=venv

# Cleanable files and directories to delete with the --clean option
CLEANABLE="build venv"

# extra  arguments passed to pip
PIP_EXTRA_ARGS=" "

# the URL to download virtualenv.pyz if needed
VIRTUALENV_PYZ_URL=https://bootstrap.pypa.io/virtualenv.pyz
################################


################################
# Current directory where this script lives
CFG_ROOT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
CFG_BIN_DIR=$CFG_ROOT_DIR/$VIRTUALENV_DIR/bin


################################
# Thirdparty package locations and index handling
# Find packages from the local thirdparty directory if present
thirddir=$CFG_ROOT_DIR/thirdparty
if [[ "$(echo $thirddir/*.whl)x" != "$thirddir/*.whlx" ]]; then
    PIP_EXTRA_ARGS="--no-index --find-links $CFG_ROOT_DIR/thirdparty"
    CFG_REQUIREMENTS=$PROD_REQUIREMENTS
else
    CFG_REQUIREMENTS=$REQUIREMENTS
fi


################################
# Set the quiet flag to empty if not defined
if [[ "$CFG_QUIET" == "" ]]; then
    CFG_QUIET=" "
fi


################################
# Find a proper Python to run
# Use environment variables or a file if available.
# Otherwise the latest Python by default.
find_python() {
    if [[ "$PYTHON_EXECUTABLE" == "" ]]; then
        # check for a file named PYTHON_EXECUTABLE
        if [ -f "$CFG_ROOT_DIR/PYTHON_EXECUTABLE" ]; then
            PYTHON_EXECUTABLE=$(cat "$CFG_ROOT_DIR/PYTHON_EXECUTABLE")
        else
            PYTHON_EXECUTABLE=python3
        fi
    fi
}


################################
create_virtualenv() {
    # create a virtualenv for Python
    # Note: we do not use the bundled Python 3 "venv" because its behavior and
    # presence is not consistent across Linux distro and sometimes pip is not
    # included either by default. The virtualenv.pyz app cures all these issues.

    VENV_DIR="$1"
    if [ ! -f "$CFG_BIN_DIR/python" ]; then

        mkdir -p "$CFG_ROOT_DIR/$VENV_DIR"

        if [ -f "$CFG_ROOT_DIR/etc/thirdparty/virtualenv.pyz" ]; then
            VIRTUALENV_PYZ="$CFG_ROOT_DIR/etc/thirdparty/virtualenv.pyz"
        else
            VIRTUALENV_PYZ="$CFG_ROOT_DIR/$VENV_DIR/virtualenv.pyz"
            wget -O "$VIRTUALENV_PYZ" "$VIRTUALENV_PYZ_URL" 2>/dev/null || curl -o  "$VIRTUALENV_PYZ" "$VIRTUALENV_PYZ_URL"
        fi

        $PYTHON_EXECUTABLE "$VIRTUALENV_PYZ" \
            --wheel embed --pip embed --setuptools embed \
            --never-download \
            --no-periodic-update \
            --no-vcs-ignore \
            $CFG_QUIET \
            "$CFG_ROOT_DIR/$VENV_DIR"
    fi
}


################################
install_packages() {
    # install requirements in virtualenv
    # note: --no-build-isolation means that pip/wheel/setuptools will not
    # be reinstalled a second time and reused from the virtualenv and this
    # speeds up the installation.
    # We always have the PEP517 build dependencies installed already.

    "$CFG_BIN_DIR/pip" install \
        --upgrade \
        --no-build-isolation \
        $CFG_QUIET \
        $PIP_EXTRA_ARGS \
        $1
}


################################
cli_help() {
    echo An initial configuration script
    echo "  usage: ./configure [options]"
    echo
    echo The default is to configure for regular use. Use --dev for development.
    echo
    echo The options are:
    echo " --clean: clean built and installed files and exit."
    echo " --dev:   configure the environment for development."
    echo " --help:  display this help message and exit."
    echo
    echo By default, the python interpreter version found in the path is used.
    echo Alternatively, the PYTHON_EXECUTABLE environment variable can be set to
    echo configure another Python executable interpreter to use. If this is not
    echo set, a file named PYTHON_EXECUTABLE containing a single line with the
    echo path of the Python executable to use will be checked last.
    set +e
    exit
}


################################
clean() {
    # Remove cleanable file and directories and files from the root dir.
    echo "* Cleaning ..."
    for cln in $CLEANABLE;
        do rm -rf "${CFG_ROOT_DIR:?}/${cln:?}";
    done
    set +e
    exit
}


################################
# Main command line entry point

# We are using getopts to parse option arguments that start with "-"
while getopts :-: optchar; do
    case "${optchar}" in
        -)
            case "${OPTARG}" in
                help  ) cli_help;;
                clean ) find_python && clean;;
                dev   ) CFG_REQUIREMENTS="$DEV_REQUIREMENTS";;
                docs   ) CFG_REQUIREMENTS="$DOCS_REQUIREMENTS";;
                rel   ) CFG_REQUIREMENTS="$REL_REQUIREMENTS";;
            esac;;
    esac
done

PIP_EXTRA_ARGS="$PIP_EXTRA_ARGS"

find_python
create_virtualenv "$VIRTUALENV_DIR"
install_packages "$CFG_REQUIREMENTS"
. "$CFG_BIN_DIR/activate"


set +e