fix missing/wrong native extensions in scripts (DataDog#774)

scripts/post_install.js

@@ -50,7 +50,7 @@ function extract () {
   console.log('Extracting prebuilt binaries.')
 
   const promise = tar.extract({
-    file: `addons-${name}.tgz`,
+    file: `prebuilds.tgz`,
     cwd: path.join(__dirname, '..')
   })
 
@@ -62,13 +62,9 @@ function extract () {
 }
 
 function cleanup () {
-  platforms
-    .map(name => path.join(cwd, `addons-${name}.tgz`))
-    .forEach(file => {
-      try {
-        fs.unlinkSync(file)
-      } catch (e) {
-        // Ignore as it's just to save space
-      }
-    })
+  try {
+    fs.unlinkSync(path.join(cwd, `prebuilds.tgz`))
+  } catch (e) {
+    // Ignore as it's just to save space
+  }
 }

scripts/prepublish.js

@@ -49,6 +49,7 @@ getPipeline()
   .then(getPrebuildArtifacts)
   .then(downloadArtifacts)
   .then(validatePrebuilds)
+  .then(copyPrebuilds)
   .then(bundle)
   .catch(e => {
     process.exitCode = 1
@@ -153,6 +154,16 @@ function validatePrebuilds () {
   }
 }
 
+function copyPrebuilds () {
+  const basename = path.normalize(path.join(__dirname, '..'))
+  const filename = 'prebuilds.tgz'
+
+  fs.copyFileSync(
+    path.join(os.tmpdir(), filename),
+    path.join(basename, filename)
+  )
+}
+
 function bundle () {
   exec('yarn bundle')
 }