/usr/lib/nodejs/global-prefix/index.js is in node-global-prefix 1.0.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* global-prefix <https://github.com/jonschlinkert/global-prefix>
*
* Copyright (c) 2015-2017 Jon Schlinkert.
* Licensed under the MIT license.
*/
'use strict';
var fs = require('fs');
var path = require('path');
var expand = require('expand-tilde');
var homedir = require('os').homedir;
var ini = require('ini');
var prefix;
function getPrefix() {
if (process.env.PREFIX) {
prefix = process.env.PREFIX;
} else {
// Start by checking if the global prefix is set by the user
var home = homedir();
if (home) {
// homedir() returns undefined if $HOME not set; path.resolve requires strings
var userConfig = path.resolve(home, '.npmrc');
prefix = tryConfigPath(userConfig);
}
if (!prefix) {
// Otherwise find the path of npm
var npm = tryNpmPath();
if (npm) {
// Check the built-in npm config file
var builtinConfig = path.resolve(npm, '..', '..', 'npmrc');
prefix = tryConfigPath(builtinConfig);
if (prefix) {
// Now the global npm config can also be checked.
var globalConfig = path.resolve(prefix, 'etc', 'npmrc');
prefix = tryConfigPath(globalConfig) || prefix;
}
}
if (!prefix) fallback();
}
}
if (prefix) {
return expand(prefix);
}
}
function fallback() {
var isWindows = require('is-windows');
if (isWindows()) {
// c:\node\node.exe --> prefix=c:\node\
prefix = process.env.APPDATA
? path.join(process.env.APPDATA, 'npm')
: path.dirname(process.execPath);
} else {
// /usr/local/bin/node --> prefix=/usr/local
prefix = path.dirname(path.dirname(process.execPath));
// destdir only is respected on Unix
if (process.env.DESTDIR) {
prefix = path.join(process.env.DESTDIR, prefix);
}
}
}
function tryNpmPath() {
try {
return fs.realpathSync(require('which').sync('npm'));
} catch (err) {}
return null;
}
function tryConfigPath(configPath) {
try {
var data = fs.readFileSync(configPath, 'utf-8');
var config = ini.parse(data);
if (config.prefix) return config.prefix;
} catch (err) {}
return null;
}
/**
* Expose `prefix`
*/
Object.defineProperty(module, 'exports', {
enumerable: true,
get: function() {
return prefix || (prefix = getPrefix());
}
});
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