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67 lines
2.3 KiB
67 lines
2.3 KiB
'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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