From 9a1aba21955bb5f4cf3e7720940564cab8fcde9d Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Fri, 13 Dec 2019 03:11:07 +0300
Subject: build/boost: add generic build.py script

---
 build/boost/build.py        | 375 ++++++++++++++++++++++++++++++++++++++++++++
 build/boost/build_travis.py |  76 +++++++++
 build/boost/build_travis.sh |  82 ----------
 build/build.py              |  13 --
 4 files changed, 451 insertions(+), 95 deletions(-)
 create mode 100755 build/boost/build.py
 create mode 100755 build/boost/build_travis.py
 delete mode 100755 build/boost/build_travis.sh

diff --git a/build/boost/build.py b/build/boost/build.py
new file mode 100755
index 0000000..8c8a818
--- /dev/null
+++ b/build/boost/build.py
@@ -0,0 +1,375 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2019 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "cmake-common" project.
+# For details, see https://github.com/egor-tensin/cmake-common.
+# Distributed under the MIT License.
+
+# This script downloads and builds the Boost libraries.
+
+import argparse
+from contextlib import contextmanager
+from enum import Enum
+import logging
+import os.path
+import platform
+import re
+import shutil
+import struct
+import subprocess
+import sys
+import tempfile
+import urllib.request
+
+
+@contextmanager
+def _chdir(path):
+    cwd = os.getcwd()
+    os.chdir(path)
+    try:
+        yield
+    finally:
+        os.chdir(cwd)
+
+
+def _setup_logging():
+    logging.basicConfig(
+        format='%(asctime)s | %(levelname)s | %(message)s',
+        level=logging.INFO)
+
+
+def _on_windows():
+    return platform.system() == 'Windows'
+
+
+def _run_executable(cmd_line):
+    logging.info('Running executable: %s', cmd_line)
+    result = subprocess.run(cmd_line)
+    result.check_returncode()
+
+
+class Platform(Enum):
+    X86 = 'x86'
+    X64 = 'x64'
+    WIN32 = 'win32'
+
+    def __str__(self):
+        return self.value
+
+    @staticmethod
+    def all():
+        return (Platform.X86, Platform.X64)
+
+    def get_address_model(self):
+        if self is Platform.X86:
+            return 32
+        if self is Platform.X64:
+            return 64
+        if self is Platform.WIN32:
+            return 32
+        raise NotImplementedError(f'unsupported platform: {self}')
+
+
+def _parse_platform(s):
+    try:
+        return Platform(s.lower())
+    except ValueError:
+        raise argparse.ArgumentTypeError(f'invalid platform: {s}')
+
+
+class Configuration(Enum):
+    DEBUG = 'debug'
+    RELEASE = 'release'
+
+    @staticmethod
+    def all():
+        return tuple(Configuration)
+
+    def __str__(self):
+        return self.value
+
+
+def _parse_configuration(s):
+    try:
+        return Configuration(s.lower())
+    except ValueError:
+        raise argparse.ArgumentTypeError(f'invalid configuration: {s}')
+
+
+class Linkage(Enum):
+    STATIC = 'static'
+    SHARED = 'shared'
+
+    @staticmethod
+    def all():
+        return tuple(Linkage)
+
+    def __str__(self):
+        return self.value
+
+
+def _parse_linkage(s):
+    try:
+        return Linkage(s)
+    except ValueError:
+        raise argparse.ArgumentTypeError(f'invalid linkage settings: {s}')
+
+
+class BoostVersion:
+    def __init__(self, major, minor, patch):
+        self.major = major
+        self.minor = minor
+        self.patch = patch
+
+    def __str__(self):
+        return f'{self.major}.{self.minor}.{self.patch}'
+
+    @property
+    def archive_ext(self):
+        return '.tar.gz'
+
+    def dir_path(self, parent_dir):
+        return os.path.join(parent_dir, self.dir_name)
+
+    @property
+    def dir_name(self):
+        return f'boost_{self.major}_{self.minor}_{self.patch}'
+
+    @property
+    def archive_name(self):
+        return f'{self.dir_name}{self.archive_ext}'
+
+    def get_download_url(self):
+        return f'https://dl.bintray.com/boostorg/release/{self}/source/{self.archive_name}'
+
+
+def _parse_boost_version(s):
+    result = re.match(r'^(\d+)\.(\d+)\.(\d+)$', s)
+    if result is None:
+        raise argparse.ArgumentTypeError(f'invalid Boost version: {s}')
+    return BoostVersion(result.group(1), result.group(2), result.group(3))
+
+
+class BoostArchive:
+    def __init__(self, version, path):
+        self.version = version
+        self.path = path
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        logging.info('Removing temporary file: %s', self.path)
+        os.remove(self.path)
+
+    @property
+    def dir_name(self):
+        return self.version.dir_name
+
+    @staticmethod
+    def download(version):
+        path = None
+        with tempfile.NamedTemporaryFile(prefix='boost_', suffix=version.archive_ext, delete=False) as dest:
+            path = dest.name
+            logging.info('Downloading Boost to: %s', path)
+            url = version.get_download_url()
+            logging.info('Download URL: %s', url)
+
+            with urllib.request.urlopen(url) as request:
+                dest.write(request.read())
+        return BoostArchive(version, path)
+
+
+class BoostDir:
+    def __init__(self, path):
+        if not os.path.isdir(path):
+            raise RuntimeError(f"Boost directory doesn't exist: {path}")
+        self.path = path
+
+    @staticmethod
+    def unpack(archive, dest):
+        path = os.path.join(dest, archive.dir_name)
+        if os.path.exists(path):
+            raise RuntimeError(f'Boost directory already exists: {path}')
+        logging.info('Unpacking Boost to: %s', path)
+        shutil.unpack_archive(archive.path, dest)
+        return BoostDir(path)
+
+    def _go(self):
+        return _chdir(self.path)
+
+    def build(self, params):
+        with self._go():
+            self._bootstrap_if_required()
+            self._b2(params)
+
+    def _bootstrap_if_required(self):
+        if os.path.isfile(self._b2_path()):
+            logging.info('Not going to bootstrap, b2 is already there')
+            return
+        self._bootstrap()
+
+    def _bootstrap(self):
+        _run_executable(self._bootstrap_path())
+
+    def _b2(self, params):
+        for b2_params in params.enum_b2_params():
+            _run_executable([self._b2_path()] + b2_params)
+
+    @staticmethod
+    def _bootstrap_path():
+        return os.path.join('.', BoostDir._bootstrap_name())
+
+    @staticmethod
+    def _bootstrap_name():
+        ext = '.sh'
+        if _on_windows():
+            ext = '.bat'
+        return f'bootstrap{ext}'
+
+    @staticmethod
+    def _b2_path():
+        return os.path.join('.', BoostDir._b2_name())
+
+    @staticmethod
+    def _b2_name():
+        ext = ''
+        if _on_windows():
+            ext = '.exe'
+        return f'b2{ext}'
+
+
+class BoostBuild:
+    def __init__(self, args):
+        self.toolchain = args.toolchain
+        self.platforms = args.platforms or Platform.all()
+        self.configurations = args.configurations or Configuration.all()
+        self.runtime_link = args.runtime_link or Linkage.all()
+        self.link = args.link or Linkage.all()
+        self.libraries = args.libraries
+        self.b2_args = args.b2_args
+
+    def enum_b2_params(self):
+        for platform in self.platforms:
+            platform_params = []
+            platform_params.append(self._address_model(platform))
+            platform_params.append(self._runtime_link())
+            platform_params.append(self._link())
+            platform_params += self._user_config_optional()
+            platform_params += self._with_optional()
+            platform_params += self.b2_args
+            if _on_windows():
+                platform_params.append(self._windows_stagedir(platform))
+                platform_params.append(self._windows_variant(self.configurations))
+                yield platform_params
+            else:
+                for configuration in self.configurations:
+                    variant_params = list(platform_params)
+                    variant_params.append(self._unix_stagedir(platform, configuration))
+                    variant_params.append(self._unix_variant(configuration))
+                    yield variant_params
+
+    @staticmethod
+    def _address_model(platform):
+        return f'address-model={platform.get_address_model()}'
+
+    def _runtime_link(self):
+        link = ','.join(map(str, self.runtime_link))
+        return f'runtime-link={link}'
+
+    def _link(self):
+        link = ','.join(map(str, self.link))
+        return f'link={link}'
+
+    def _user_config_optional(self):
+        if self.toolchain is None:
+            return []
+        return [f'--user-config={self.toolchain}']
+
+    def _with_optional(self):
+        return [f'--with-{lib}' for lib in self.libraries]
+
+    @staticmethod
+    def _windows_stagedir(platform):
+        return f'--stagedir=stage/{platform}'
+
+    @staticmethod
+    def _unix_stagedir(platform, configuration):
+        return f'--stagedir=stage/{platform}/{configuration}'
+
+    @staticmethod
+    def _windows_variant(configurations):
+        variant = ','.join(map(str, configurations))
+        return f'variant={variant}'
+
+    @staticmethod
+    def _unix_variant(configuration):
+        return f'variant={configuration}'
+
+
+def _parse_args(argv=None):
+    if argv is None:
+        argv = sys.argv[1:]
+    logging.info('Command line arguments: %s', argv)
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--version', metavar='VERSION', dest='boost_version',
+                        type=_parse_boost_version, required=True,
+                        help='Boost version (in the MAJOR.MINOR.PATCH format)')
+    parser.add_argument('--no-download', action='store_true',
+                        help="don't download Boost, attempt to build the existing directory")
+    parser.add_argument('--toolchain', metavar='PATH',
+                        help='Boost user configuration file')
+    parser.add_argument('--platform', metavar='PLATFORM',
+                        nargs='*', dest='platforms', default=(),
+                        type=_parse_platform,
+                        help='target platform (e.g. x86/x64)')
+    parser.add_argument('--configuration', metavar='CONFIGURATION',
+                        nargs='*', dest='configurations', default=(),
+                        type=_parse_configuration,
+                        help='target platform (e.g. Debug/Release)')
+    parser.add_argument('--runtime-link', metavar='LINKAGE',
+                        nargs='*', dest='runtime_link', default=(),
+                        type=_parse_linkage,
+                        help='runtime linkage options (e.g. static/shared)')
+    parser.add_argument('--link', metavar='LINKAGE',
+                        nargs='*', dest='link', default=(),
+                        type=_parse_linkage,
+                        help='library linkage options (e.g. static/shared)')
+    parser.add_argument('--build', metavar='DIR', dest='build_dir',
+                        type=os.path.abspath, default='.',
+                        help='destination directory')
+    parser.add_argument('--with', metavar='LIB', dest='libraries',
+                        nargs='*', default=(),
+                        help='only build these libraries')
+    parser.add_argument('b2_args', nargs='*', metavar='B2_ARG', default=(),
+                        help='additional b2 arguments, to be passed verbatim')
+    return parser.parse_args(argv)
+
+
+def _build(boost_dir, build_params):
+    boost_dir.build(build_params)
+
+
+def download_and_build(argv=None):
+    args = _parse_args(argv)
+    build_params = BoostBuild(args)
+    if args.no_download:
+        boost_dir = BoostDir(args.boost_version.dir_path(args.build_dir))
+        _build(boost_dir, build_params)
+    else:
+        with BoostArchive.download(args.boost_version) as archive:
+            boost_dir = BoostDir.unpack(archive, args.build_dir)
+            _build(boost_dir, build_params)
+
+
+def main(argv=None):
+    _setup_logging()
+    try:
+        download_and_build(argv)
+    except Exception as e:
+        logging.exception(e)
+        raise
+
+
+if __name__ == '__main__':
+    main()
diff --git a/build/boost/build_travis.py b/build/boost/build_travis.py
new file mode 100755
index 0000000..8e78f72
--- /dev/null
+++ b/build/boost/build_travis.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2019 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "cmake-common" project.
+# For details, see https://github.com/egor-tensin/cmake-common.
+# Distributed under the MIT License.
+
+# This is similar to build.py, but auto-fills some parameters for build.py from
+# the Travis-defined environment variables.
+# Boost is built in $HOME.
+
+import logging
+import os
+import sys
+
+from build import download_and_build
+
+
+def _env(name):
+    if name not in os.environ:
+        raise RuntimeError(f'undefined environment variable: {name}')
+    return os.environ[name]
+
+
+def _check_travis():
+    if 'TRAVIS' not in os.environ:
+        raise RuntimeError('not running on Travis')
+
+
+def _get_build_dir():
+    return _env('HOME')
+
+
+def _get_boost_version():
+    return _env('travis_boost_version')
+
+
+def _get_configuration():
+    return _env('configuration')
+
+
+def _get_platform():
+    return _env('platform')
+
+
+def _setup_logging():
+    logging.basicConfig(
+        format='%(asctime)s | %(levelname)s | %(message)s',
+        level=logging.INFO)
+
+
+def build_travis(argv=None):
+    if argv is None:
+        argv = sys.argv[1:]
+    logging.info('Command line arguments: %s', argv)
+    _check_travis()
+    travis_argv = [
+        '--build', _get_build_dir(),
+        '--version', _get_boost_version(),
+        '--configuration', _get_configuration(),
+        '--platform', _get_platform(),
+    ]
+    download_and_build(travis_argv + argv)
+
+
+def main(argv=None):
+    _setup_logging()
+    try:
+        build_travis(argv)
+    except Exception as e:
+        logging.exception(e)
+        raise
+
+
+if __name__ == '__main__':
+    main()
diff --git a/build/boost/build_travis.sh b/build/boost/build_travis.sh
deleted file mode 100755
index 267262d..0000000
--- a/build/boost/build_travis.sh
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright (c) 2019 Egor Tensin <Egor.Tensin@gmail.com>
-# This file is part of the "cmake-common" project.
-# For details, see https://github.com/egor-tensin/cmake-common.
-# Distributed under the MIT License.
-
-# This script is used during a Travis build to download and build Boost.
-# Input:
-# * environment variables $travis_boost_version, $configuration and $platform.
-# Output:
-# * unpacked Boost distribution at $HOME/boost_X_YY_Z,
-# * built libraries at $HOME/boost_X_YY_Z/stage/$platform/${configuration,,}.
-
-set -o errexit -o nounset -o pipefail -o xtrace
-
-readonly base_dir="$HOME"
-readonly script_name="$( basename -- "${BASH_SOURCE[0]}" )"
-
-dump() {
-    local msg
-    for msg; do
-        echo "$script_name: $msg"
-    done
-}
-
-set_paths() {
-    local boost_fs="boost_${travis_boost_version//\./_}"
-
-    readonly boost_archive="$boost_fs.tar.gz"
-    readonly boost_url="https://dl.bintray.com/boostorg/release/$travis_boost_version/source/$boost_archive"
-    readonly boost_dir="$base_dir/$boost_fs"
-}
-
-set_address_model() {
-    if [ "$platform" = x64 ]; then
-        readonly address_model=64
-    elif [ "$platform" = x86 ]; then
-        readonly address_model=32
-    else
-        dump "unsupported platform: $platform" >&2
-        exit 1
-    fi
-}
-
-set_configuration() {
-    configuration="${configuration,,}"
-    readonly configuration
-}
-
-set_parameters() {
-    set_paths
-    set_address_model
-    set_configuration
-}
-
-download() {
-    wget --quiet -O "$boost_archive" -- "$boost_url"
-    tar xzvf "$boost_archive" > /dev/null
-}
-
-build() {
-    cd -- "$boost_dir"
-
-    ./bootstrap.sh
-
-    ./b2                               \
-        "address-model=$address_model" \
-        variant="$configuration"       \
-        "--stagedir=$boost_dir/stage/$platform/$configuration" \
-        "$@"
-}
-
-main() {
-    pushd -- "$base_dir"
-    trap 'popd' EXIT
-    set_parameters
-    download
-    build "$@"
-}
-
-main "$@"
diff --git a/build/build.py b/build/build.py
index 8b398cf..dd88156 100755
--- a/build/build.py
+++ b/build/build.py
@@ -22,16 +22,6 @@ import sys
 import tempfile
 
 
-@contextmanager
-def _chdir(path):
-    cwd = os.getcwd()
-    os.chdir(path)
-    try:
-        yield
-    finally:
-        os.chdir(cwd)
-
-
 def _make_tmp_dir(**kwargs):
     path = tempfile.mkdtemp(**kwargs)
     logging.info('Created temporary directory: %s', path)
@@ -84,9 +74,6 @@ class BuildDir:
     def _make_build_dir():
         return _make_tmp_dir(prefix='build_')
 
-    def go(self):
-        return _chdir(self.path)
-
     def __enter__(self):
         return self
 
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