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