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executable file
·314 lines (294 loc) · 11 KB
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#!/usr/bin/env node
'use strict';
const { spawnSync } = require('child_process');
const { mkdirSync, existsSync, createWriteStream } = require('fs');
const { join, dirname, parse } = require('path');
const { Readable } = require('stream');
const { pipeline } = require('stream/promises');
const fetchImpl = typeof globalThis.fetch === 'function'
? globalThis.fetch
: null;
function findNearestNodeModules(startDir) {
let dir = startDir;
const { root } = parse(startDir);
while (true) {
const candidate = join(dir, 'node_modules');
if (existsSync(candidate)) {
return candidate;
}
if (dir === root) {
throw new Error('Could not find a node_modules directory.');
}
dir = dirname(dir);
}
}
const NODE_MODULES_DIR = findNearestNodeModules(__dirname);
const CACHE_DIR = join(NODE_MODULES_DIR, '.cache', 'vnu-jar', 'java');
const TEMURIN_VERSION = '17.0.17+10';
const TEMURIN_BASE_URL = `https://github.com/adoptium/temurin17-binaries/releases/download/jdk-${TEMURIN_VERSION}/`;
const MAX_FETCH_ATTEMPTS = 3;
// Builds a readable description of an error, walking the chain of cause
// errors that the fetch API attaches. The real reason for a failed fetch
// (a DNS failure, a refused connection, a TLS or proxy error) is carried
// on err.cause, not in the generic top-level message.
function describeError(err) {
if (!err) {
return 'unknown error';
}
let description = err.message || String(err);
const seen = new Set([err]);
let cause = err.cause;
while (cause && !seen.has(cause)) {
seen.add(cause);
description += ` (cause: ${cause.code || cause.message || cause})`;
cause = cause.cause;
}
return description;
}
// Returns a proxy URL from the npm or shell environment, or null. The
// built-in fetch ignores these variables; curl honors them, so the curl
// fallback forwards whatever this finds as an explicit --proxy argument.
function getProxyFromEnv() {
const env = process.env;
return env.npm_config_https_proxy
|| env.npm_config_proxy
|| env.HTTPS_PROXY
|| env.https_proxy
|| env.HTTP_PROXY
|| env.http_proxy
|| env.ALL_PROXY
|| env.all_proxy
|| null;
}
function delay(ms) {
return new Promise((resolve) => setTimeout(resolve, ms));
}
function getJavaVersion(javaPath) {
try {
const result = spawnSync(javaPath, ['-version'], { encoding: 'utf8' });
const versionOutput = result.stderr || result.stdout || '';
const match = versionOutput.match(/version "(\d+)(?:\.(\d+))?/);
if (match) {
return parseInt(match[1], 10);
}
} catch (err) {
return null;
}
return null;
}
function findSystemJava() {
const whichCmd = process.platform === 'win32' ? 'where' : 'which';
const result = spawnSync(whichCmd, ['java'], { encoding: 'utf8' });
if (result.status === 0 && result.stdout) {
const javaPath = result.stdout.split(/\r?\n/)[0].trim();
const version = getJavaVersion(javaPath);
if (version !== null && version >= 11) {
return javaPath;
}
}
return null;
}
function getPlatformArchiveName() {
let arch = process.arch;
let plat = 'linux';
if (process.platform === 'win32') {
plat = 'windows';
} else if (process.platform === 'darwin') {
plat = 'mac';
}
if (plat === 'mac' && arch === 'arm64') {
arch = 'aarch64';
}
const ext = process.platform === 'win32' ? 'zip' : 'tar.gz';
const version = TEMURIN_VERSION.replace('+', '_');
return `OpenJDK17U-jre_${arch}_${plat}_hotspot_${version}.${ext}`;
}
// Path of the java executable inside an extracted Temurin runtime.
function getLocalJavaExecutablePath() {
const home = join(CACHE_DIR, `jdk-${TEMURIN_VERSION}-jre`);
if (process.platform === 'win32') {
return join(home, 'bin', 'java.exe');
}
if (process.platform === 'darwin') {
return join(home, 'Contents', 'Home', 'bin', 'java');
}
return join(home, 'bin', 'java');
}
// Returns the cached java executable path, or null if none is present.
// The check targets the executable itself, not the cache directory: an
// interrupted download can leave the directory in place with no runtime
// inside it, and that must count as not installed.
function findCachedJava() {
const javaPath = getLocalJavaExecutablePath();
return existsSync(javaPath) ? javaPath : null;
}
// Downloads url to destPath with the built-in fetch, retrying network
// failures a few times. A non-OK HTTP response is not retried, since a
// bad status will not change between attempts.
async function downloadWithFetch(url, destPath) {
let lastError;
for (let attempt = 1; attempt <= MAX_FETCH_ATTEMPTS; attempt++) {
try {
const res = await fetchImpl(url);
if (!res.ok) {
throw new Error(
`server responded ${res.status} ${res.statusText}`);
}
await pipeline(Readable.fromWeb(res.body),
createWriteStream(destPath));
return;
} catch (err) {
lastError = err;
// Network failures from fetch carry a cause; the non-OK HTTP
// error thrown above does not. Only network failures retry.
const transient = err.cause !== undefined;
if (!transient || attempt === MAX_FETCH_ATTEMPTS) {
throw err;
}
const waitMs = 1000 * attempt;
console.log(`Download attempt ${attempt} failed `
+ `(${describeError(err)}); retrying in ${waitMs} ms ...`);
await delay(waitMs);
}
}
throw lastError;
}
// Downloads url to destPath by spawning curl. curl honors proxy
// environment variables and the OS trust store, both of which the
// built-in fetch ignores, so it can succeed where fetch cannot.
function downloadWithCurl(url, destPath, proxy) {
const args = ['--fail', '--show-error', '--location',
'--retry', '3', '--retry-delay', '2',
'--output', destPath, url];
if (proxy) {
args.push('--proxy', proxy);
}
const result = spawnSync('curl', args, { stdio: 'inherit' });
if (result.error) {
const err = new Error(`could not run curl: ${result.error.message}`);
err.cause = result.error;
throw err;
}
if (result.status !== 0) {
throw new Error(`curl exited with status ${result.status}`);
}
}
// Downloads url to destPath, preferring the built-in fetch and falling
// back to curl. When a proxy is configured, curl is used directly,
// because the built-in fetch cannot reach the network through a proxy.
async function downloadArchive(url, destPath) {
const proxy = getProxyFromEnv();
if (fetchImpl && !proxy) {
try {
await downloadWithFetch(url, destPath);
return;
} catch (fetchErr) {
console.log('Built-in download failed '
+ `(${describeError(fetchErr)}); retrying with curl ...`);
try {
downloadWithCurl(url, destPath, proxy);
return;
} catch (curlErr) {
// The message below already states both failure reasons in
// full, so no cause is attached: that would only make
// describeError repeat them.
throw new Error('Could not download the Java runtime. '
+ `Built-in download: ${describeError(fetchErr)}. `
+ `curl fallback: ${describeError(curlErr)}.`);
}
}
}
if (proxy) {
console.log(`Using curl to download (proxy configured: ${proxy}).`);
} else {
console.log('Using curl to download (the built-in fetch is '
+ 'unavailable).');
}
downloadWithCurl(url, destPath, proxy);
}
function extractArchive(archivePath) {
if (process.platform === 'win32') {
console.log('Extracting ZIP archive ...');
const result = spawnSync('powershell', [
'-NoProfile',
'-NonInteractive',
'-Command',
'Expand-Archive',
'-Force',
archivePath,
CACHE_DIR
], { stdio: 'inherit' });
if (result.error) {
throw new Error(
`could not run PowerShell: ${result.error.message}`);
}
if (result.status !== 0) {
throw new Error('Failed to extract the Java archive.');
}
} else {
console.log('Extracting tar.gz archive ...');
const result = spawnSync('tar',
['-xzf', archivePath, '-C', CACHE_DIR], { stdio: 'inherit' });
if (result.error) {
throw new Error(`could not run tar: ${result.error.message}`);
}
if (result.status !== 0) {
throw new Error('Failed to extract the Java archive.');
}
}
}
async function downloadJava() {
mkdirSync(CACHE_DIR, { recursive: true });
const archiveName = getPlatformArchiveName();
const url = TEMURIN_BASE_URL + archiveName;
const archivePath = join(CACHE_DIR, archiveName);
console.log(`Downloading a Java runtime from ${url} ...`);
await downloadArchive(url, archivePath);
extractArchive(archivePath);
console.log('Local Java runtime now installed.');
}
// Resolves a usable java executable: a system Java 11 or later if one is
// present, otherwise a runtime from an earlier download, otherwise a
// freshly downloaded one.
async function resolveJava() {
const systemJava = findSystemJava();
if (systemJava) {
return systemJava;
}
const cachedJava = findCachedJava();
if (cachedJava) {
return cachedJava;
}
await downloadJava();
const javaPath = findCachedJava();
if (!javaPath) {
throw new Error('The Java runtime was not found after download and '
+ `extraction; expected it at: ${getLocalJavaExecutablePath()}`);
}
return javaPath;
}
if (require.main === module) {
// Invoked as the npm postinstall script. A failed download must not
// abort npm install: vnu.jar itself is already in place, and
// resolveJava() downloads Java on first use when it is needed.
resolveJava().catch((err) => {
console.warn(
'vnu-jar: could not install a Java runtime during postinstall.');
console.warn(`vnu-jar: reason: ${describeError(err)}`);
console.warn('vnu-jar: this is not fatal. A Java runtime will be '
+ 'downloaded the first time you run vnu, or you can install '
+ 'Java 11 or later yourself and put it on your PATH.');
// process.exit() is intentionally not called here. Calling it while
// fetch sockets are still closing aborts Node with a libuv
// assertion on Windows; letting this callback return lets the event
// loop close those handles and then exit with status 0.
});
}
module.exports = {
resolveJava,
describeError,
getProxyFromEnv,
getPlatformArchiveName,
getLocalJavaExecutablePath,
findCachedJava,
};
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