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'use strict'
const util = require('util')
const chownr = util.promisify(require('chownr'))
const mkdirp = 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 Promise.resolve()
}
getSelf()
if (self.uid !== 0) {
// almost certainly can't chown anyway
return Promise.resolve()
}
return Promise.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((err) => {
if (err.code === 'ENOENT')
return null
throw err
})
)
})
}
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 !== 0) {
// almost certainly can't chown anyway
return
}
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 Promise.resolve(inferOwner(cache)).then(() => {
return mkdirp(p)
.then((made) => {
if (made)
return fixOwner(cache, made).then(() => made)
})
.catch((err) => {
if (err.code === 'EEXIST')
return fixOwner(cache, p).then(() => null)
throw err
})
})
}
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
}
}