'use strict' var path = require('path') var fs = require('fs') var inflight = require('inflight') var accessError = require('./access-error.js') var andIgnoreErrors = require('./and-ignore-errors.js') var isFsAccessAvailable = require('./is-fs-access-available.js') if (isFsAccessAvailable) { module.exports = fsAccessImplementation } else { module.exports = fsOpenImplementation } // exposed only for testing purposes module.exports.fsAccessImplementation = fsAccessImplementation module.exports.fsOpenImplementation = fsOpenImplementation function fsAccessImplementation (dir, done) { done = inflight('writable:' + dir, done) if (!done) return fs.access(dir, fs.W_OK, done) } function fsOpenImplementation (dir, done) { done = inflight('writable:' + dir, done) if (!done) return var tmp = path.join(dir, '.npm.check.permissions') fs.open(tmp, 'w', function (er, fd) { if (er) return done(accessError(dir, er)) fs.close(fd, function () { fs.unlink(tmp, andIgnoreErrors(done)) }) }) }