| '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 }) |
| }) |
| }) |
| }) |
| } |
