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#!/usr/bin/env python3
import argparse
import os
import re
import shutil
import subprocess
import sys
import sysconfig
from os.path import relpath
from pathlib import Path
SCRIPT_NAME = Path(__file__).name
CHECKOUT = Path(__file__).resolve().parent.parent
CROSS_BUILD_DIR = CHECKOUT / "cross-build"
def delete_if_exists(path):
if path.exists():
print(f"Deleting {path} ...")
shutil.rmtree(path)
def subdir(name, *, clean=None):
path = CROSS_BUILD_DIR / name
if clean:
delete_if_exists(path)
if not path.exists():
if clean is None:
sys.exit(
f"{path} does not exist. Create it by running the appropriate "
f"`configure` subcommand of {SCRIPT_NAME}.")
else:
path.mkdir(parents=True)
return path
def run(command, *, host=None, **kwargs):
env = os.environ.copy()
if host:
env_script = CHECKOUT / "Android/android-env.sh"
env_output = subprocess.run(
f"set -eu; "
f"HOST={host}; "
f"PREFIX={subdir(host)}/prefix; "
f". {env_script}; "
f"export",
check=True, shell=True, text=True, stdout=subprocess.PIPE
).stdout
for line in env_output.splitlines():
# We don't require every line to match, as there may be some other
# output from installing the NDK.
if match := re.search(
"^(declare -x |export )?(\\w+)=['\"]?(.*?)['\"]?$", line
):
key, value = match[2], match[3]
if env.get(key) != value:
print(line)
env[key] = value
if env == os.environ:
raise ValueError(f"Found no variables in {env_script.name} output:\n"
+ env_output)
print(">", " ".join(map(str, command)))
try:
subprocess.run(command, check=True, env=env, **kwargs)
except subprocess.CalledProcessError as e:
sys.exit(e)
def build_python_path():
"""The path to the build Python binary."""
build_dir = subdir("build")
binary = build_dir / "python"
if not binary.is_file():
binary = binary.with_suffix(".exe")
if not binary.is_file():
raise FileNotFoundError("Unable to find `python(.exe)` in "
f"{build_dir}")
return binary
def configure_build_python(context):
os.chdir(subdir("build", clean=context.clean))
command = [relpath(CHECKOUT / "configure")]
if context.args:
command.extend(context.args)
run(command)
def make_build_python(context):
os.chdir(subdir("build"))
run(["make", "-j", str(os.cpu_count())])
def unpack_deps(host):
deps_url = "https://github.com/beeware/cpython-android-source-deps/releases/download"
for name_ver in ["bzip2-1.0.8-1", "libffi-3.4.4-2", "openssl-3.0.13-1",
"sqlite-3.45.1-0", "xz-5.4.6-0"]:
filename = f"{name_ver}-{host}.tar.gz"
run(["wget", f"{deps_url}/{name_ver}/{filename}"])
run(["tar", "-xf", filename])
os.remove(filename)
def configure_host_python(context):
host_dir = subdir(context.host, clean=context.clean)
prefix_dir = host_dir / "prefix"
if not prefix_dir.exists():
prefix_dir.mkdir()
os.chdir(prefix_dir)
unpack_deps(context.host)
build_dir = host_dir / "build"
build_dir.mkdir(exist_ok=True)
os.chdir(build_dir)
command = [
# Basic cross-compiling configuration
relpath(CHECKOUT / "configure"),
f"--host={context.host}",
f"--build={sysconfig.get_config_var('BUILD_GNU_TYPE')}",
f"--with-build-python={build_python_path()}",
"--without-ensurepip",
# Android always uses a shared libpython.
"--enable-shared",
"--without-static-libpython",
# Dependent libraries. The others are found using pkg-config: see
# android-env.sh.
f"--with-openssl={prefix_dir}",
]
if context.args:
command.extend(context.args)
run(command, host=context.host)
def make_host_python(context):
host_dir = subdir(context.host)
os.chdir(host_dir / "build")
run(["make", "-j", str(os.cpu_count())], host=context.host)
run(["make", "install", f"prefix={host_dir}/prefix"], host=context.host)
def build_all(context):
steps = [configure_build_python, make_build_python, configure_host_python,
make_host_python]
for step in steps:
step(context)
def clean_all(context):
delete_if_exists(CROSS_BUILD_DIR)
def main():
parser = argparse.ArgumentParser()
subcommands = parser.add_subparsers(dest="subcommand")
build = subcommands.add_parser("build", help="Build everything")
configure_build = subcommands.add_parser("configure-build",
help="Run `configure` for the "
"build Python")
make_build = subcommands.add_parser("make-build",
help="Run `make` for the build Python")
configure_host = subcommands.add_parser("configure-host",
help="Run `configure` for Android")
make_host = subcommands.add_parser("make-host",
help="Run `make` for Android")
clean = subcommands.add_parser("clean", help="Delete files and directories "
"created by this script")
for subcommand in build, configure_build, configure_host:
subcommand.add_argument(
"--clean", action="store_true", default=False, dest="clean",
help="Delete any relevant directories before building")
for subcommand in build, configure_host, make_host:
subcommand.add_argument(
"host", metavar="HOST",
choices=["aarch64-linux-android", "x86_64-linux-android"],
help="Host triplet: choices=[%(choices)s]")
for subcommand in build, configure_build, configure_host:
subcommand.add_argument("args", nargs="*",
help="Extra arguments to pass to `configure`")
context = parser.parse_args()
dispatch = {"configure-build": configure_build_python,
"make-build": make_build_python,
"configure-host": configure_host_python,
"make-host": make_host_python,
"build": build_all,
"clean": clean_all}
dispatch[context.subcommand](context)
if __name__ == "__main__":
main()
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