source: trip-planner-front/node_modules/cacache/lib/util/move-file.js@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.3 KB
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1'use strict'
2
3const fs = require('fs')
4const util = require('util')
5const chmod = util.promisify(fs.chmod)
6const unlink = util.promisify(fs.unlink)
7const stat = util.promisify(fs.stat)
8const move = require('@npmcli/move-file')
9const pinflight = require('promise-inflight')
10
11module.exports = moveFile
12
13function moveFile (src, dest) {
14 const isWindows = global.__CACACHE_TEST_FAKE_WINDOWS__ ||
15 process.platform === 'win32'
16
17 // This isn't quite an fs.rename -- the assumption is that
18 // if `dest` already exists, and we get certain errors while
19 // trying to move it, we should just not bother.
20 //
21 // In the case of cache corruption, users will receive an
22 // EINTEGRITY error elsewhere, and can remove the offending
23 // content their own way.
24 //
25 // Note that, as the name suggests, this strictly only supports file moves.
26 return new Promise((resolve, reject) => {
27 fs.link(src, dest, (err) => {
28 if (err) {
29 if (isWindows && err.code === 'EPERM') {
30 // XXX This is a really weird way to handle this situation, as it
31 // results in the src file being deleted even though the dest
32 // might not exist. Since we pretty much always write files to
33 // deterministic locations based on content hash, this is likely
34 // ok (or at worst, just ends in a future cache miss). But it would
35 // be worth investigating at some time in the future if this is
36 // really what we want to do here.
37 return resolve()
38 } else if (err.code === 'EEXIST' || err.code === 'EBUSY') {
39 // file already exists, so whatever
40 return resolve()
41 } else
42 return reject(err)
43 } else
44 return resolve()
45 })
46 })
47 .then(() => {
48 // content should never change for any reason, so make it read-only
49 return Promise.all([
50 unlink(src),
51 !isWindows && chmod(dest, '0444'),
52 ])
53 })
54 .catch(() => {
55 return pinflight('cacache-move-file:' + dest, () => {
56 return stat(dest).catch((err) => {
57 if (err.code !== 'ENOENT') {
58 // Something else is wrong here. Bail bail bail
59 throw err
60 }
61 // file doesn't already exist! let's try a rename -> copy fallback
62 // only delete if it successfully copies
63 return move(src, dest)
64 })
65 })
66 })
67}
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