forked from zhurui/management
52 lines
1.7 KiB
JavaScript
52 lines
1.7 KiB
JavaScript
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'use strict'
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const fs = require('graceful-fs')
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const BB = require('bluebird')
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const chmod = BB.promisify(fs.chmod)
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const unlink = BB.promisify(fs.unlink)
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let move
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let pinflight
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module.exports = moveFile
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function moveFile (src, dest) {
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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 BB.fromNode(cb => {
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fs.link(src, dest, err => {
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if (err) {
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if (err.code === 'EEXIST' || err.code === 'EBUSY') {
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// file already exists, so whatever
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} else if (err.code === 'EPERM' && process.platform === 'win32') {
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// file handle stayed open even past graceful-fs limits
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} else {
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return cb(err)
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}
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}
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return cb()
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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 BB.join(unlink(src), process.platform !== 'win32' && chmod(dest, '0444'))
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}).catch(() => {
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if (!pinflight) { pinflight = require('promise-inflight') }
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return pinflight('cacache-move-file:' + dest, () => {
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return BB.promisify(fs.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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if (!move) { move = require('move-concurrently') }
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return move(src, dest, { BB, fs })
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})
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})
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})
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}
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