aaac7fed
 liuqimichale
add
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'use strict'
const fs = require('graceful-fs')
const BB = require('bluebird')
const chmod = BB.promisify(fs.chmod)
const unlink = BB.promisify(fs.unlink)
let move
let pinflight
module.exports = moveFile
function moveFile (src, dest) {
// This isn't quite an fs.rename -- the assumption is that
// if `dest` already exists, and we get certain errors while
// trying to move it, we should just not bother.
//
// In the case of cache corruption, users will receive an
// EINTEGRITY error elsewhere, and can remove the offending
// content their own way.
//
// Note that, as the name suggests, this strictly only supports file moves.
return BB.fromNode(cb => {
fs.link(src, dest, err => {
if (err) {
if (err.code === 'EEXIST' || err.code === 'EBUSY') {
// file already exists, so whatever
} else if (err.code === 'EPERM' && process.platform === 'win32') {
// file handle stayed open even past graceful-fs limits
} else {
return cb(err)
}
}
return cb()
})
}).then(() => {
// content should never change for any reason, so make it read-only
return BB.join(unlink(src), process.platform !== 'win32' && chmod(dest, '0444'))
}).catch(() => {
if (!pinflight) { pinflight = require('promise-inflight') }
return pinflight('cacache-move-file:' + dest, () => {
return BB.promisify(fs.stat)(dest).catch(err => {
if (err.code !== 'ENOENT') {
// Something else is wrong here. Bail bail bail
throw err
}
// file doesn't already exist! let's try a rename -> copy fallback
if (!move) { move = require('move-concurrently') }
return move(src, dest, { BB, fs })
})
})
})
}
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