source: trip-planner-front/node_modules/graceful-fs/polyfills.js@ 6fe77af

Last change on this file since 6fe77af was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit
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File size: 9.5 KB
Line 
1var constants = require('constants')
2
3var origCwd = process.cwd
4var cwd = null
5
6var platform = process.env.GRACEFUL_FS_PLATFORM || process.platform
7
8process.cwd = function() {
9 if (!cwd)
10 cwd = origCwd.call(process)
11 return cwd
12}
13try {
14 process.cwd()
15} catch (er) {}
16
17// This check is needed until node.js 12 is required
18if (typeof process.chdir === 'function') {
19 var chdir = process.chdir
20 process.chdir = function (d) {
21 cwd = null
22 chdir.call(process, d)
23 }
24 if (Object.setPrototypeOf) Object.setPrototypeOf(process.chdir, chdir)
25}
26
27module.exports = patch
28
29function patch (fs) {
30 // (re-)implement some things that are known busted or missing.
31
32 // lchmod, broken prior to 0.6.2
33 // back-port the fix here.
34 if (constants.hasOwnProperty('O_SYMLINK') &&
35 process.version.match(/^v0\.6\.[0-2]|^v0\.5\./)) {
36 patchLchmod(fs)
37 }
38
39 // lutimes implementation, or no-op
40 if (!fs.lutimes) {
41 patchLutimes(fs)
42 }
43
44 // https://github.com/isaacs/node-graceful-fs/issues/4
45 // Chown should not fail on einval or eperm if non-root.
46 // It should not fail on enosys ever, as this just indicates
47 // that a fs doesn't support the intended operation.
48
49 fs.chown = chownFix(fs.chown)
50 fs.fchown = chownFix(fs.fchown)
51 fs.lchown = chownFix(fs.lchown)
52
53 fs.chmod = chmodFix(fs.chmod)
54 fs.fchmod = chmodFix(fs.fchmod)
55 fs.lchmod = chmodFix(fs.lchmod)
56
57 fs.chownSync = chownFixSync(fs.chownSync)
58 fs.fchownSync = chownFixSync(fs.fchownSync)
59 fs.lchownSync = chownFixSync(fs.lchownSync)
60
61 fs.chmodSync = chmodFixSync(fs.chmodSync)
62 fs.fchmodSync = chmodFixSync(fs.fchmodSync)
63 fs.lchmodSync = chmodFixSync(fs.lchmodSync)
64
65 fs.stat = statFix(fs.stat)
66 fs.fstat = statFix(fs.fstat)
67 fs.lstat = statFix(fs.lstat)
68
69 fs.statSync = statFixSync(fs.statSync)
70 fs.fstatSync = statFixSync(fs.fstatSync)
71 fs.lstatSync = statFixSync(fs.lstatSync)
72
73 // if lchmod/lchown do not exist, then make them no-ops
74 if (!fs.lchmod) {
75 fs.lchmod = function (path, mode, cb) {
76 if (cb) process.nextTick(cb)
77 }
78 fs.lchmodSync = function () {}
79 }
80 if (!fs.lchown) {
81 fs.lchown = function (path, uid, gid, cb) {
82 if (cb) process.nextTick(cb)
83 }
84 fs.lchownSync = function () {}
85 }
86
87 // on Windows, A/V software can lock the directory, causing this
88 // to fail with an EACCES or EPERM if the directory contains newly
89 // created files. Try again on failure, for up to 60 seconds.
90
91 // Set the timeout this long because some Windows Anti-Virus, such as Parity
92 // bit9, may lock files for up to a minute, causing npm package install
93 // failures. Also, take care to yield the scheduler. Windows scheduling gives
94 // CPU to a busy looping process, which can cause the program causing the lock
95 // contention to be starved of CPU by node, so the contention doesn't resolve.
96 if (platform === "win32") {
97 fs.rename = (function (fs$rename) { return function (from, to, cb) {
98 var start = Date.now()
99 var backoff = 0;
100 fs$rename(from, to, function CB (er) {
101 if (er
102 && (er.code === "EACCES" || er.code === "EPERM")
103 && Date.now() - start < 60000) {
104 setTimeout(function() {
105 fs.stat(to, function (stater, st) {
106 if (stater && stater.code === "ENOENT")
107 fs$rename(from, to, CB);
108 else
109 cb(er)
110 })
111 }, backoff)
112 if (backoff < 100)
113 backoff += 10;
114 return;
115 }
116 if (cb) cb(er)
117 })
118 }})(fs.rename)
119 }
120
121 // if read() returns EAGAIN, then just try it again.
122 fs.read = (function (fs$read) {
123 function read (fd, buffer, offset, length, position, callback_) {
124 var callback
125 if (callback_ && typeof callback_ === 'function') {
126 var eagCounter = 0
127 callback = function (er, _, __) {
128 if (er && er.code === 'EAGAIN' && eagCounter < 10) {
129 eagCounter ++
130 return fs$read.call(fs, fd, buffer, offset, length, position, callback)
131 }
132 callback_.apply(this, arguments)
133 }
134 }
135 return fs$read.call(fs, fd, buffer, offset, length, position, callback)
136 }
137
138 // This ensures `util.promisify` works as it does for native `fs.read`.
139 if (Object.setPrototypeOf) Object.setPrototypeOf(read, fs$read)
140 return read
141 })(fs.read)
142
143 fs.readSync = (function (fs$readSync) { return function (fd, buffer, offset, length, position) {
144 var eagCounter = 0
145 while (true) {
146 try {
147 return fs$readSync.call(fs, fd, buffer, offset, length, position)
148 } catch (er) {
149 if (er.code === 'EAGAIN' && eagCounter < 10) {
150 eagCounter ++
151 continue
152 }
153 throw er
154 }
155 }
156 }})(fs.readSync)
157
158 function patchLchmod (fs) {
159 fs.lchmod = function (path, mode, callback) {
160 fs.open( path
161 , constants.O_WRONLY | constants.O_SYMLINK
162 , mode
163 , function (err, fd) {
164 if (err) {
165 if (callback) callback(err)
166 return
167 }
168 // prefer to return the chmod error, if one occurs,
169 // but still try to close, and report closing errors if they occur.
170 fs.fchmod(fd, mode, function (err) {
171 fs.close(fd, function(err2) {
172 if (callback) callback(err || err2)
173 })
174 })
175 })
176 }
177
178 fs.lchmodSync = function (path, mode) {
179 var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK, mode)
180
181 // prefer to return the chmod error, if one occurs,
182 // but still try to close, and report closing errors if they occur.
183 var threw = true
184 var ret
185 try {
186 ret = fs.fchmodSync(fd, mode)
187 threw = false
188 } finally {
189 if (threw) {
190 try {
191 fs.closeSync(fd)
192 } catch (er) {}
193 } else {
194 fs.closeSync(fd)
195 }
196 }
197 return ret
198 }
199 }
200
201 function patchLutimes (fs) {
202 if (constants.hasOwnProperty("O_SYMLINK")) {
203 fs.lutimes = function (path, at, mt, cb) {
204 fs.open(path, constants.O_SYMLINK, function (er, fd) {
205 if (er) {
206 if (cb) cb(er)
207 return
208 }
209 fs.futimes(fd, at, mt, function (er) {
210 fs.close(fd, function (er2) {
211 if (cb) cb(er || er2)
212 })
213 })
214 })
215 }
216
217 fs.lutimesSync = function (path, at, mt) {
218 var fd = fs.openSync(path, constants.O_SYMLINK)
219 var ret
220 var threw = true
221 try {
222 ret = fs.futimesSync(fd, at, mt)
223 threw = false
224 } finally {
225 if (threw) {
226 try {
227 fs.closeSync(fd)
228 } catch (er) {}
229 } else {
230 fs.closeSync(fd)
231 }
232 }
233 return ret
234 }
235
236 } else {
237 fs.lutimes = function (_a, _b, _c, cb) { if (cb) process.nextTick(cb) }
238 fs.lutimesSync = function () {}
239 }
240 }
241
242 function chmodFix (orig) {
243 if (!orig) return orig
244 return function (target, mode, cb) {
245 return orig.call(fs, target, mode, function (er) {
246 if (chownErOk(er)) er = null
247 if (cb) cb.apply(this, arguments)
248 })
249 }
250 }
251
252 function chmodFixSync (orig) {
253 if (!orig) return orig
254 return function (target, mode) {
255 try {
256 return orig.call(fs, target, mode)
257 } catch (er) {
258 if (!chownErOk(er)) throw er
259 }
260 }
261 }
262
263
264 function chownFix (orig) {
265 if (!orig) return orig
266 return function (target, uid, gid, cb) {
267 return orig.call(fs, target, uid, gid, function (er) {
268 if (chownErOk(er)) er = null
269 if (cb) cb.apply(this, arguments)
270 })
271 }
272 }
273
274 function chownFixSync (orig) {
275 if (!orig) return orig
276 return function (target, uid, gid) {
277 try {
278 return orig.call(fs, target, uid, gid)
279 } catch (er) {
280 if (!chownErOk(er)) throw er
281 }
282 }
283 }
284
285 function statFix (orig) {
286 if (!orig) return orig
287 // Older versions of Node erroneously returned signed integers for
288 // uid + gid.
289 return function (target, options, cb) {
290 if (typeof options === 'function') {
291 cb = options
292 options = null
293 }
294 function callback (er, stats) {
295 if (stats) {
296 if (stats.uid < 0) stats.uid += 0x100000000
297 if (stats.gid < 0) stats.gid += 0x100000000
298 }
299 if (cb) cb.apply(this, arguments)
300 }
301 return options ? orig.call(fs, target, options, callback)
302 : orig.call(fs, target, callback)
303 }
304 }
305
306 function statFixSync (orig) {
307 if (!orig) return orig
308 // Older versions of Node erroneously returned signed integers for
309 // uid + gid.
310 return function (target, options) {
311 var stats = options ? orig.call(fs, target, options)
312 : orig.call(fs, target)
313 if (stats.uid < 0) stats.uid += 0x100000000
314 if (stats.gid < 0) stats.gid += 0x100000000
315 return stats;
316 }
317 }
318
319 // ENOSYS means that the fs doesn't support the op. Just ignore
320 // that, because it doesn't matter.
321 //
322 // if there's no getuid, or if getuid() is something other
323 // than 0, and the error is EINVAL or EPERM, then just ignore
324 // it.
325 //
326 // This specific case is a silent failure in cp, install, tar,
327 // and most other unix tools that manage permissions.
328 //
329 // When running as root, or if other types of errors are
330 // encountered, then it's strict.
331 function chownErOk (er) {
332 if (!er)
333 return true
334
335 if (er.code === "ENOSYS")
336 return true
337
338 var nonroot = !process.getuid || process.getuid() !== 0
339 if (nonroot) {
340 if (er.code === "EINVAL" || er.code === "EPERM")
341 return true
342 }
343
344 return false
345 }
346}
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