fix: pack git directories properly

- add dirPacker to options
- set dirPacker to null on lifecycle options

PR-URL: #4
Credit: @claudiahdz
Close: #4
Reviewed-by: @isaacs

index.js

@@ -373,7 +373,10 @@ class Installer {
         pkg, stage, pkgPath, LifecycleOpts(this.opts).concat({
           // TODO: can be removed once npm-lifecycle is updated to modern
           //       config practices.
-          config: Object.assign({}, this.opts, { log: null }),
+          config: Object.assign({}, this.opts, {
+            log: null,
+            dirPacker: null
+          }),
           dir: this.prefix
         }))
       ).tap(() => { this.timings.scripts += Date.now() - start })

lib/extract.js

@@ -12,7 +12,8 @@ let workerFarm
 const ENABLE_WORKERS = false
 
 const ExtractOpts = figgyPudding({
-  log: {}
+  log: {},
+  dirPacker: {}
 })
 
 module.exports = {

test/specs/lib/extract.js

@@ -10,6 +10,20 @@ const extract = requireInject('../../../lib/extract.js', {
   }
 })
 
+test('extract.child() ensures dirPacker is defined', t => {
+  const name = 'name'
+  const child = { version: '0.0.0', integrity: 'integrity', resolved: 'resolved' }
+  const childPath = './path'
+
+  const opts = { log: { level: 'level' }, dirPacker: {} }
+  const a = extract.child(name, child, childPath, opts)
+
+  a.then(b => {
+    t.ok('dirPacker' in b[2], 'dirPacker is defined')
+    t.end()
+  })
+})
+
 test('extract.child() only overwrites dirPacker when opts.dirPacker is defined', t => {
   const name = 'name'
   const child = { version: '0.0.0', integrity: 'integrity', resolved: 'resolved' }