detroit-python/GetPythonEnvironment.java at master · openjdk/detroit-python · GitHub

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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

* This code is free software; you can redistribute it and/or modify it

* under the terms of the GNU General Public License version 2 only, as

* published by the Free Software Foundation.

* This code is distributed in the hope that it will be useful, but WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License

* version 2 for more details (a copy is included in the LICENSE file that

* accompanied this code).

* You should have received a copy of the GNU General Public License version

* 2 along with this work; if not, write to the Free Software Foundation,

* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

* or visit www.oracle.com if you need additional information or have any

* questions.

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.ArrayList;

import java.util.regex.Pattern;

import java.util.stream.Collectors;

import java.util.Properties;

// Tool to get directory where Python's shared object/dll and where

// Python executable lives and write those to a Properties file specified.

public class GetPythonEnvironment {

private GetPythonEnvironment() {

}

public enum OS {

WINDOWS,

LINUX,

MAC,

UNKNOWN

}

// detect the current OS

private static OS getCurrentOS() {

String osName = System.getProperty("os.name").toLowerCase();

if (osName.contains("linux")) {

return OS.LINUX;

} else if (osName.contains("mac")) {

return OS.MAC;

} else if (osName.contains("win")) {

return OS.WINDOWS;

} else {

return OS.UNKNOWN;

}

private static final OS THE_OS = getCurrentOS();

// result from a child Process

record ExecResult(String output, int exitCode) {

}

private static ExecResult runCommand(String... commands) throws IOException, InterruptedException {

return runCommand(false, commands);

}

// run a command in a child process and get its output

private static ExecResult runCommand(boolean firstLine, String... commands) throws IOException, InterruptedException {

ProcessBuilder builder = new ProcessBuilder(commands);

builder.redirectErrorStream(true);

Process process = builder.start();

// collect all output lines

var lines = new ArrayList<String>();

try (var reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {

String line;

while ((line = reader.readLine()) != null) {

lines.add(line);

}

return new ExecResult(firstLine

? (lines.isEmpty() ? null : lines.get(0))

: lines.stream().collect(Collectors.joining("\n")),

process.waitFor());

}

// find a OS command using OS specific command search command

private static String findCommand(String command) throws IOException, InterruptedException {

ExecResult execResult;

if (THE_OS == OS.WINDOWS) {

execResult = runCommand(true, "where.exe", command);

} else {

execResult = runCommand(true, "which", command);

}

return execResult.exitCode() == 0 ? execResult.output() : null;

}

// check python version is expected minor version or not

private static boolean checkPythonVersion(String pythonBin, String pythonMinor) throws IOException, InterruptedException {

// Run 'python --version' and capture output (both stdout and stderr)

ExecResult result = runCommand(pythonBin, "--version");

String versionStr = result.output();

if (versionStr == null || versionStr.trim().isEmpty()) {

IO.println("Could not parse Python version.");

return false;

}

// Regex to match 'Python 3.14.2' (or similar)

var pattern = Pattern.compile("Python\\s+([0-9]+)\\.([0-9]+)\\.[0-9]+");

var matcher = pattern.matcher(versionStr);

if (matcher.matches()) {

String major = matcher.group(1);

String minor = matcher.group(2);

if ("3".equals(major) && pythonMinor.equals(minor)) {

IO.println("Python 3." + pythonMinor + ".x detected: " + versionStr);

return true;

} else {

IO.println("Python is not 3." + pythonMinor + ".x: " + versionStr);

return false;

}

} else {

IO.println("Could not parse Python version.");

return false;

}

private static String getPythonBasePrefix(String pythonBin) throws IOException, InterruptedException {

// get Python's sys.base_prefix value

ExecResult execResult = runCommand(pythonBin, "-c", "import sys; print(sys.base_prefix)");

if (execResult.exitCode != 0) {

throw new IOException("getting python sys.base_prefix failed");

}

return execResult.output();

}

public static void main(String[] args) {

try {

// should pass version line 3.14 or 3.13 etc. Only major

// and minor versions. Do not pass 3.13.2 for example!

if (args.length != 2) {

System.err.println("java JextractHelper <python-version> <target-file>");

System.exit(1);

}

String[] parts = args[0].split("-")[0].split("\\.");

String pythonVersion = parts[0] + "." + parts[1];

Path targetFile = Paths.get(args[1]);

if (THE_OS == OS.UNKNOWN) {

System.err.println("Unsupported OS: " + System.getProperty("os.name"));

System.exit(2);

}

// Try python version specified, else 3, else python

String pythonBin = findCommand("python");

if (pythonBin == null) {

pythonBin = findCommand("python3");

}

if (pythonBin == null) {

pythonBin = findCommand("python" + pythonVersion);

}

if (pythonBin != null) {

IO.println("Using Python @ " + pythonBin);

} else {

IO.println("Python not found!");

System.exit(3);

}

// make sure that we are on expected python version

if (!checkPythonVersion(pythonBin, pythonVersion.substring("3.".length()))) {

System.exit(4);

}

String pythonLibDir;

if (THE_OS == OS.WINDOWS) {

pythonLibDir = getPythonBasePrefix(pythonBin);

} else {

ExecResult execResult = runCommand(pythonBin, "-c",

"import sysconfig; print(sysconfig.get_config_var('LIBDIR'))");

if (execResult.exitCode() != 0) {

System.err.println("getting python sysconfig.get_config_var('LIBDIR') failed");

System.exit(5);

}

pythonLibDir = execResult.output();

}

ExecResult execResult = runCommand(pythonBin, "-c",

"import sys; print(sys.executable)");

if (execResult.exitCode() != 0) {

System.err.println("getting python sys.executable failed");

System.exit(6);

}

String pythonExecutable = execResult.output();

Properties props = new Properties();

props.setProperty("python.libdir", pythonLibDir);

props.setProperty("python.program.name", pythonExecutable);

targetFile.getParent().toFile().mkdirs();

try (var writer = Files.newBufferedWriter(targetFile)) {

props.store(writer, "Python shared object and program locations");

}

} catch (IOException | InterruptedException ex) {

ex.printStackTrace(System.err);

System.exit(5);

}

detroit-python/GetPythonEnvironment.java at master · openjdk/detroit-python · GitHub

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