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