256 lines
6.3 KiB
JavaScript
256 lines
6.3 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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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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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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// (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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fs.lchmod = function (path, mode, callback) {
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callback = callback || noop
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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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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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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 err, err2
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try {
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var ret = fs.fchmodSync(fd, mode)
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} catch (er) {
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err = er
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}
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try {
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fs.closeSync(fd)
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} catch (er) {
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err2 = er
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}
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if (err || err2) throw (err || err2)
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return ret
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}
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}
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// lutimes implementation, or no-op
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if (!fs.lutimes) {
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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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cb = cb || noop
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if (er) return cb(er)
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fs.futimes(fd, at, mt, function (er) {
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fs.close(fd, function (er2) {
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return 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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, err
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, err2
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, ret
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try {
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var ret = fs.futimesSync(fd, at, mt)
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} catch (er) {
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err = er
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}
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try {
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fs.closeSync(fd)
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} catch (er) {
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err2 = er
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}
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if (err || err2) throw (err || err2)
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return ret
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}
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} else if (fs.utimensat && constants.hasOwnProperty("AT_SYMLINK_NOFOLLOW")) {
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// maybe utimensat will be bound soonish?
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fs.lutimes = function (path, at, mt, cb) {
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fs.utimensat(path, at, mt, constants.AT_SYMLINK_NOFOLLOW, cb)
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}
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fs.lutimesSync = function (path, at, mt) {
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return fs.utimensatSync(path, at, mt, constants.AT_SYMLINK_NOFOLLOW)
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}
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} else {
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fs.lutimes = function (_a, _b, _c, cb) { process.nextTick(cb) }
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fs.lutimesSync = function () {}
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}
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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 = chownFix(fs.chmod)
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fs.fchmod = chownFix(fs.fchmod)
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fs.lchmod = chownFix(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 = chownFix(fs.chmodSync)
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fs.fchmodSync = chownFix(fs.fchmodSync)
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fs.lchmodSync = chownFix(fs.lchmodSync)
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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, res) {
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if (chownErOk(er)) er = null
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cb(er, res)
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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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// 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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// 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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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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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 1 second.
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if (process.platform === "win32") {
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var rename_ = fs.rename
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fs.rename = function rename (from, to, cb) {
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var start = Date.now()
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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 < 1000) {
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return rename_(from, to, CB)
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}
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if(cb) cb(er)
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})
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}
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}
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// if read() returns EAGAIN, then just try it again.
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var read = fs.read
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fs.read = 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 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 read.call(fs, fd, buffer, offset, length, position, callback)
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}
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var readSync = fs.readSync
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fs.readSync = 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 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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}
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