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shrine-medco/shrine-webclient/src/main/html/node_modules/graceful-fs/polyfills.js
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polyfills.js
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			var fs = require('./fs.js')
			var constants = require('constants')

			var origCwd = process.cwd
			var cwd = null
			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)

			// 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 1 second.
			if (process.platform === "win32") {
			fs.rename = (function (fs$rename) { return function (from, to, cb) {
			var start = Date.now()
			fs$rename(from, to, function CB (er) {
			if (er
			&& (er.code === "EACCES" \|\| er.code === "EPERM")
			&& Date.now() - start < 1000) {
			return fs$rename(from, to, CB)
			}
			if (cb) cb(er)
			})
			}})(fs.rename)
			}

			// if read() returns EAGAIN, then just try it again.
			fs.read = (function (fs$read) { return function (fd, buffer, offset, length, position, callback_) {
			var callback
			if (callback_ && typeof callback_ === 'function') {
			var eagCounter = 0
			callback = function (er, _, __) {
			if (er && er.code === 'EAGAIN' && eagCounter < 10) {
			eagCounter ++
			return fs$read.call(fs, fd, buffer, offset, length, position, callback)
			}
			callback_.apply(this, arguments)
			}
			}
			return fs$read.call(fs, fd, buffer, offset, length, position, callback)
			}})(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, res) {
			if (chownErOk(er)) er = null
			if (cb) cb(er, res)
			})
			}
			}

			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, res) {
			if (chownErOk(er)) er = null
			if (cb) cb(er, res)
			})
			}
			}

			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
			}
			}
			}

			// 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
			}