config: add figgyConfig for things that use figgy-pudding

lib/config/figgy-config.js

@@ -0,0 +1,80 @@
+'use strict'
+
+const BB = require('bluebird')
+
+const crypto = require('crypto')
+const figgyPudding = require('figgy-pudding')
+const log = require('npmlog')
+const npm = require('../npm.js')
+const pack = require('../pack.js')
+const path = require('path')
+
+const npmSession = crypto.randomBytes(8).toString('hex')
+log.verbose('npm-session', npmSession)
+
+const NpmConfig = figgyPudding({
+  log: {default: () => log},
+  'prefer-offline': {},
+  'prefer-online': {}
+})
+
+let baseConfig
+
+module.exports = mkConfig
+function mkConfig (...providers) {
+  if (!baseConfig) {
+    baseConfig = NpmConfig(npm.config, {
+      // Add some non-npm-config opts by hand.
+      cache: path.join(npm.config.get('cache'), '_cacache'),
+      dirPacker: pack.packGitDep,
+      hashAlgorithm: 'sha1',
+      includeDeprecated: false,
+      npmSession,
+      projectScope: npm.projectScope,
+      refer: npm.registry.refer,
+      dmode: npm.modes.exec,
+      fmode: npm.modes.file,
+      umask: npm.modes.umask,
+      Promise: BB
+    })
+    const ownerStats = calculateOwner()
+    if (ownerStats.uid != null || ownerStats.gid != null) {
+      baseConfig = baseConfig.concat(ownerStats)
+    }
+  }
+  let conf = baseConfig.concat(...providers)
+  // Adapt some other configs if missing
+  if (!('prefer-online' in conf)) {
+    conf = conf.concat({
+      'prefer-online': npm.config.get('cache-max') <= 0
+    })
+  }
+  if (!('prefer-offline' in conf)) {
+    conf = conf.concat({
+      'prefer-online': npm.config.get('cache-min') >= 9999
+    })
+  }
+  return conf
+}
+
+let effectiveOwner
+function calculateOwner () {
+  if (!effectiveOwner) {
+    effectiveOwner = { uid: 0, gid: 0 }
+
+    // Pretty much only on windows
+    if (!process.getuid) {
+      return effectiveOwner
+    }
+
+    effectiveOwner.uid = +process.getuid()
+    effectiveOwner.gid = +process.getgid()
+
+    if (effectiveOwner.uid === 0) {
+      if (process.env.SUDO_UID) effectiveOwner.uid = +process.env.SUDO_UID
+      if (process.env.SUDO_GID) effectiveOwner.gid = +process.env.SUDO_GID
+    }
+  }
+
+  return effectiveOwner
+}