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Filename :
fix-owner.js
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'use strict' const BB = require('bluebird') const chownr = BB.promisify(require('chownr')) const mkdirp = BB.promisify(require('mkdirp')) const inflight = require('promise-inflight') const inferOwner = require('infer-owner') // Memoize getuid()/getgid() calls. // patch process.setuid/setgid to invalidate cached value on change const self = { uid: null, gid: null } const getSelf = () => { if (typeof self.uid !== 'number') { self.uid = process.getuid() const setuid = process.setuid process.setuid = (uid) => { self.uid = null process.setuid = setuid return process.setuid(uid) } } if (typeof self.gid !== 'number') { self.gid = process.getgid() const setgid = process.setgid process.setgid = (gid) => { self.gid = null process.setgid = setgid return process.setgid(gid) } } } module.exports.chownr = fixOwner function fixOwner (cache, filepath) { if (!process.getuid) { // This platform doesn't need ownership fixing return BB.resolve() } getSelf() if (self.uid !== 0) { // almost certainly can't chown anyway return BB.resolve() } return BB.resolve(inferOwner(cache)).then(owner => { const { uid, gid } = owner // No need to override if it's already what we used. if (self.uid === uid && self.gid === gid) { return } return inflight( 'fixOwner: fixing ownership on ' + filepath, () => chownr( filepath, typeof uid === 'number' ? uid : self.uid, typeof gid === 'number' ? gid : self.gid ).catch({ code: 'ENOENT' }, () => null) ) }) } module.exports.chownr.sync = fixOwnerSync function fixOwnerSync (cache, filepath) { if (!process.getuid) { // This platform doesn't need ownership fixing return } const { uid, gid } = inferOwner.sync(cache) getSelf() if (self.uid === uid && self.gid === gid) { // No need to override if it's already what we used. return } try { chownr.sync( filepath, typeof uid === 'number' ? uid : self.uid, typeof gid === 'number' ? gid : self.gid ) } catch (err) { // only catch ENOENT, any other error is a problem. if (err.code === 'ENOENT') { return null } throw err } } module.exports.mkdirfix = mkdirfix function mkdirfix (cache, p, cb) { // we have to infer the owner _before_ making the directory, even though // we aren't going to use the results, since the cache itself might not // exist yet. If we mkdirp it, then our current uid/gid will be assumed // to be correct if it creates the cache folder in the process. return BB.resolve(inferOwner(cache)).then(() => { return mkdirp(p).then(made => { if (made) { return fixOwner(cache, made).then(() => made) } }).catch({ code: 'EEXIST' }, () => { // There's a race in mkdirp! return fixOwner(cache, p).then(() => null) }) }) } module.exports.mkdirfix.sync = mkdirfixSync function mkdirfixSync (cache, p) { try { inferOwner.sync(cache) const made = mkdirp.sync(p) if (made) { fixOwnerSync(cache, made) return made } } catch (err) { if (err.code === 'EEXIST') { fixOwnerSync(cache, p) return null } else { throw err } } }