'use strict' const fs = require('@npmcli/fs') const move = require('@npmcli/move-file') const pinflight = require('promise-inflight') module.exports = moveFile async function moveFile (src, dest) { const isWindows = process.platform === 'win32' // 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. try { await fs.link(src, dest) } catch (err) { if (isWindows && err.code === 'EPERM') { // XXX This is a really weird way to handle this situation, as it // results in the src file being deleted even though the dest // might not exist. Since we pretty much always write files to // deterministic locations based on content hash, this is likely // ok (or at worst, just ends in a future cache miss). But it would // be worth investigating at some time in the future if this is // really what we want to do here. } else if (err.code === 'EEXIST' || err.code === 'EBUSY') { // file already exists, so whatever } else { throw err } } try { await Promise.all([ fs.unlink(src), !isWindows && fs.chmod(dest, '0444'), ]) } catch (e) { return pinflight('cacache-move-file:' + dest, async () => { await 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 // only delete if it successfully copies return move(src, dest) }) } }