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							- 'use strict'
 
- const util = require('util')
 
- const chownr = util.promisify(require('chownr'))
 
- const mkdirp = util.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 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
 
-     }
 
-   }
 
- }
 
 
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