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| /* Copyright 2013 Joseph Spencer.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
var which = require('which');
var fs = require('fs');
var path = require('path');
var dirname = path.dirname;
var exec = require('child_process').exec;
var execSync = require('child_process').execSync;
var exists = fs.existsSync;
var stat = fs.statSync;
var readlink = fs.readlinkSync;
var resolve = path.resolve;
var lstat = fs.lstatSync;
var javaHome;
module.exports = findJavaHome;
var isWindows = process.platform.indexOf('win') === 0;
var JAVAC_FILENAME = 'javac' + (isWindows ? '.exe' : '');
var REG_CMD = 'REG';
var REG_TYPE_PATTERN = /(REG_SZ|REG_MULTI_SZ|REG_EXPAND_SZ|REG_DWORD|REG_QWORD|REG_BINARY|REG_NONE)/
function findJavaHome(options, cb) {
if (typeof options === 'function') {
cb = options;
options = null;
}
options = options || {
allowJre: false
};
var macUtility;
var possibleKeyPaths;
Iif (process.env.JAVA_HOME && dirIsJavaHome(process.env.JAVA_HOME)) {
javaHome = process.env.JAVA_HOME;
}
if (javaHome) return next(cb, null, javaHome);
//windows
Eif (process.platform.indexOf('win') === 0) {
//java_home can be in many places
//JDK paths
possibleKeyPaths = [
'HKLM\\SOFTWARE\\JavaSoft\\Java Development Kit'
];
//JRE paths
Iif (options.allowJre) {
possibleKeyPaths = possibleKeyPaths.concat([
'HKLM\\SOFTWARE\\JavaSoft\\Java Runtime Environment',
]);
}
javaHome = findInRegistry(possibleKeyPaths);
Eif (javaHome) return next(cb, null, javaHome);
}
which(JAVAC_FILENAME, function(err, proposed) {
if (err) return next(cb, err, null);
//resolve symlinks
proposed = findLinkedFile(proposed);
//get the /bin directory
proposed = dirname(proposed);
//on mac, java install has a utility script called java_home that does the
//dirty work for us
macUtility = resolve(proposed, 'java_home');
if (exists(macUtility)) {
exec(macUtility, {
cwd: proposed
}, function(error, out, err) {
if (error || err) return next(cb, error || '' + err, null);
javaHome = '' + out.replace(/\n$/, '');
next(cb, null, javaHome);
});
return;
}
//up one from /bin
javaHome = dirname(proposed);
next(cb, null, javaHome);
});
}
function findInRegistry(paths) {
Iif (!paths.length) return null;
var done = false;
var currVer;
for (var i in paths) {
var key = paths[i];
var cv = getRegValueByName(key, 'CurrentVersion');
var registryJavaHome = getRegValueByName(key + '\\' + cv, 'JavaHome');
Eif (registryJavaHome) break;
}
return registryJavaHome;
}
// iterate through symbolic links until
// file is found
function findLinkedFile(file) {
if (!lstat(file).isSymbolicLink()) return file;
return findLinkedFile(readlink(file));
}
function next(cb, err, home) {
return cb(err, home);
}
function dirIsJavaHome(dir) {
return exists('' + dir) && stat(dir).isDirectory() && exists(path.resolve(dir, 'bin', JAVAC_FILENAME));
}
function after(count, cb) {
return function() {
if (count <= 1) return process.nextTick(cb);
--count;
};
}
function getRegValueByName(path, name) {
var cmd = [REG_CMD, 'QUERY', '"' + path + '"', '/v', name].join(' ');
try {
var result = execSync(cmd, {
cwd: undefined,
env: process.env,
stdio: ['ignore', 'pipe', 'pipe']
});
return result.toString().split(REG_TYPE_PATTERN).pop().trim();
} catch (e) {
return null;
}
}
|