'use strict'
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const fs = require('fs')
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const util = require('util')
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const chmod = util.promisify(fs.chmod)
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const unlink = util.promisify(fs.unlink)
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const stat = util.promisify(fs.stat)
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const move = require('@npmcli/move-file')
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const pinflight = require('promise-inflight')
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module.exports = moveFile
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function moveFile (src, dest) {
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const isWindows = global.__CACACHE_TEST_FAKE_WINDOWS__ ||
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process.platform === 'win32'
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// This isn't quite an fs.rename -- the assumption is that
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// if `dest` already exists, and we get certain errors while
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// trying to move it, we should just not bother.
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//
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// In the case of cache corruption, users will receive an
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// EINTEGRITY error elsewhere, and can remove the offending
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// content their own way.
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//
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// Note that, as the name suggests, this strictly only supports file moves.
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return new Promise((resolve, reject) => {
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fs.link(src, dest, (err) => {
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if (err) {
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if (isWindows && err.code === 'EPERM') {
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// XXX This is a really weird way to handle this situation, as it
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// results in the src file being deleted even though the dest
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// might not exist. Since we pretty much always write files to
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// deterministic locations based on content hash, this is likely
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// ok (or at worst, just ends in a future cache miss). But it would
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// be worth investigating at some time in the future if this is
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// really what we want to do here.
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return resolve()
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} else if (err.code === 'EEXIST' || err.code === 'EBUSY') {
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// file already exists, so whatever
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return resolve()
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} else
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return reject(err)
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} else
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return resolve()
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})
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})
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.then(() => {
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// content should never change for any reason, so make it read-only
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return Promise.all([
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unlink(src),
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!isWindows && chmod(dest, '0444'),
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])
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})
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.catch(() => {
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return pinflight('cacache-move-file:' + dest, () => {
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return stat(dest).catch((err) => {
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if (err.code !== 'ENOENT') {
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// Something else is wrong here. Bail bail bail
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throw err
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}
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// file doesn't already exist! let's try a rename -> copy fallback
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// only delete if it successfully copies
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return move(src, dest)
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})
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})
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})
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}
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