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polyfills.js
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var constants = require('constants') var origCwd = process.cwd var cwd = null var platform = process.env.GRACEFUL_FS_PLATFORM || process.platform process.cwd = function() { if (!cwd) cwd = origCwd.call(process) return cwd } try { process.cwd() } catch (er) {} var chdir = process.chdir process.chdir = function(d) { cwd = null chdir.call(process, d) } module.exports = patch function patch (fs) { // (re-)implement some things that are known busted or missing. // lchmod, broken prior to 0.6.2 // back-port the fix here. if (constants.hasOwnProperty('O_SYMLINK') && process.version.match(/^v0\.6\.[0-2]|^v0\.5\./)) { patchLchmod(fs) } // lutimes implementation, or no-op if (!fs.lutimes) { patchLutimes(fs) } // https://github.com/isaacs/node-graceful-fs/issues/4 // Chown should not fail on einval or eperm if non-root. // It should not fail on enosys ever, as this just indicates // that a fs doesn't support the intended operation. fs.chown = chownFix(fs.chown) fs.fchown = chownFix(fs.fchown) fs.lchown = chownFix(fs.lchown) fs.chmod = chmodFix(fs.chmod) fs.fchmod = chmodFix(fs.fchmod) fs.lchmod = chmodFix(fs.lchmod) fs.chownSync = chownFixSync(fs.chownSync) fs.fchownSync = chownFixSync(fs.fchownSync) fs.lchownSync = chownFixSync(fs.lchownSync) fs.chmodSync = chmodFixSync(fs.chmodSync) fs.fchmodSync = chmodFixSync(fs.fchmodSync) fs.lchmodSync = chmodFixSync(fs.lchmodSync) fs.stat = statFix(fs.stat) fs.fstat = statFix(fs.fstat) fs.lstat = statFix(fs.lstat) fs.statSync = statFixSync(fs.statSync) fs.fstatSync = statFixSync(fs.fstatSync) fs.lstatSync = statFixSync(fs.lstatSync) // if lchmod/lchown do not exist, then make them no-ops if (!fs.lchmod) { fs.lchmod = function (path, mode, cb) { if (cb) process.nextTick(cb) } fs.lchmodSync = function () {} } if (!fs.lchown) { fs.lchown = function (path, uid, gid, cb) { if (cb) process.nextTick(cb) } fs.lchownSync = function () {} } // on Windows, A/V software can lock the directory, causing this // to fail with an EACCES or EPERM if the directory contains newly // created files. Try again on failure, for up to 60 seconds. // Set the timeout this long because some Windows Anti-Virus, such as Parity // bit9, may lock files for up to a minute, causing npm package install // failures. Also, take care to yield the scheduler. Windows scheduling gives // CPU to a busy looping process, which can cause the program causing the lock // contention to be starved of CPU by node, so the contention doesn't resolve. if (platform === "win32") { fs.rename = (function (fs$rename) { return function (from, to, cb) { var start = Date.now() var backoff = 0; fs$rename(from, to, function CB (er) { if (er && (er.code === "EACCES" || er.code === "EPERM") && Date.now() - start < 60000) { setTimeout(function() { fs.stat(to, function (stater, st) { if (stater && stater.code === "ENOENT") fs$rename(from, to, CB); else cb(er) }) }, backoff) if (backoff < 100) backoff += 10; return; } if (cb) cb(er) }) }})(fs.rename) } // if read() returns EAGAIN, then just try it again. fs.read = (function (fs$read) { function read (fd, buffer, offset, length, position, callback_) { var callback if (callback_ && typeof callback_ === 'function') { var eagCounter = 0 callback = function (er, _, __) { if (er && er.code === 'EAGAIN' && eagCounter < 10) { eagCounter ++ return fs$read.call(fs, fd, buffer, offset, length, position, callback) } callback_.apply(this, arguments) } } return fs$read.call(fs, fd, buffer, offset, length, position, callback) } // This ensures `util.promisify` works as it does for native `fs.read`. read.__proto__ = fs$read return read })(fs.read) fs.readSync = (function (fs$readSync) { return function (fd, buffer, offset, length, position) { var eagCounter = 0 while (true) { try { return fs$readSync.call(fs, fd, buffer, offset, length, position) } catch (er) { if (er.code === 'EAGAIN' && eagCounter < 10) { eagCounter ++ continue } throw er } } }})(fs.readSync) function patchLchmod (fs) { fs.lchmod = function (path, mode, callback) { fs.open( path , constants.O_WRONLY | constants.O_SYMLINK , mode , function (err, fd) { if (err) { if (callback) callback(err) return } // prefer to return the chmod error, if one occurs, // but still try to close, and report closing errors if they occur. fs.fchmod(fd, mode, function (err) { fs.close(fd, function(err2) { if (callback) callback(err || err2) }) }) }) } fs.lchmodSync = function (path, mode) { var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK, mode) // prefer to return the chmod error, if one occurs, // but still try to close, and report closing errors if they occur. var threw = true var ret try { ret = fs.fchmodSync(fd, mode) threw = false } finally { if (threw) { try { fs.closeSync(fd) } catch (er) {} } else { fs.closeSync(fd) } } return ret } } function patchLutimes (fs) { if (constants.hasOwnProperty("O_SYMLINK")) { fs.lutimes = function (path, at, mt, cb) { fs.open(path, constants.O_SYMLINK, function (er, fd) { if (er) { if (cb) cb(er) return } fs.futimes(fd, at, mt, function (er) { fs.close(fd, function (er2) { if (cb) cb(er || er2) }) }) }) } fs.lutimesSync = function (path, at, mt) { var fd = fs.openSync(path, constants.O_SYMLINK) var ret var threw = true try { ret = fs.futimesSync(fd, at, mt) threw = false } finally { if (threw) { try { fs.closeSync(fd) } catch (er) {} } else { fs.closeSync(fd) } } return ret } } else { fs.lutimes = function (_a, _b, _c, cb) { if (cb) process.nextTick(cb) } fs.lutimesSync = function () {} } } function chmodFix (orig) { if (!orig) return orig return function (target, mode, cb) { return orig.call(fs, target, mode, function (er) { if (chownErOk(er)) er = null if (cb) cb.apply(this, arguments) }) } } function chmodFixSync (orig) { if (!orig) return orig return function (target, mode) { try { return orig.call(fs, target, mode) } catch (er) { if (!chownErOk(er)) throw er } } } function chownFix (orig) { if (!orig) return orig return function (target, uid, gid, cb) { return orig.call(fs, target, uid, gid, function (er) { if (chownErOk(er)) er = null if (cb) cb.apply(this, arguments) }) } } function chownFixSync (orig) { if (!orig) return orig return function (target, uid, gid) { try { return orig.call(fs, target, uid, gid) } catch (er) { if (!chownErOk(er)) throw er } } } function statFix (orig) { if (!orig) return orig // Older versions of Node erroneously returned signed integers for // uid + gid. return function (target, options, cb) { if (typeof options === 'function') { cb = options options = null } function callback (er, stats) { if (stats) { if (stats.uid < 0) stats.uid += 0x100000000 if (stats.gid < 0) stats.gid += 0x100000000 } if (cb) cb.apply(this, arguments) } return options ? orig.call(fs, target, options, callback) : orig.call(fs, target, callback) } } function statFixSync (orig) { if (!orig) return orig // Older versions of Node erroneously returned signed integers for // uid + gid. return function (target, options) { var stats = options ? orig.call(fs, target, options) : orig.call(fs, target) if (stats.uid < 0) stats.uid += 0x100000000 if (stats.gid < 0) stats.gid += 0x100000000 return stats; } } // ENOSYS means that the fs doesn't support the op. Just ignore // that, because it doesn't matter. // // if there's no getuid, or if getuid() is something other // than 0, and the error is EINVAL or EPERM, then just ignore // it. // // This specific case is a silent failure in cp, install, tar, // and most other unix tools that manage permissions. // // When running as root, or if other types of errors are // encountered, then it's strict. function chownErOk (er) { if (!er) return true if (er.code === "ENOSYS") return true var nonroot = !process.getuid || process.getuid() !== 0 if (nonroot) { if (er.code === "EINVAL" || er.code === "EPERM") return true } return false } }