Consume Tarball from Maven

Summary:
Currently, when creating an app using the command:
`npx react-native init MyApp --version nightly`
iOS fails to install the dependencies because it does not find a proper tarball to run Hermes.

This diff solve the problem by fetching the Hermes tarball that is created by the CI while building the nightly.

## Changelog:
[iOS][Fixed] - Make the nightly work with the  proper Hermes tarball

Reviewed By: cortinico

Differential Revision: D40512418

fbshipit-source-id: d8057207ab8d26fa318023e50434d178cc702006

scripts/__tests__/hermes-utils-test.js

@@ -101,6 +101,10 @@ function populateMockFilesystem() {
     path.join(SDKS_DIR, 'hermes-engine', 'hermes-engine.podspec'),
     'Dummy file',
   );
+  fs.writeFileSync(
+    path.join(SDKS_DIR, 'hermes-engine', 'hermes-utils.rb'),
+    'Dummy file',
+  );
 }
 
 describe('hermes-utils', () => {
@@ -279,6 +283,23 @@ describe('hermes-utils', () => {
         ),
       );
     });
+    it('should copy hermes-utils.rb to Hermes source directory', () => {
+      copyPodSpec();
+      expect(
+        fs.readFileSync(path.join(SDKS_DIR, 'hermes', 'hermes-utils.rb'), {
+          encoding: 'utf8',
+          flag: 'r',
+        }),
+      ).toEqual(
+        fs.readFileSync(
+          path.join(SDKS_DIR, 'hermes-engine', 'hermes-utils.rb'),
+          {
+            encoding: 'utf8',
+            flag: 'r',
+          },
+        ),
+      );
+    });
   });
   describe('shouldUsePrebuiltHermesC', () => {
     it('returns false if path to osx hermesc does not exist', () => {

scripts/hermes/hermes-utils.js

@@ -152,9 +152,15 @@ function copyPodSpec() {
   if (!fs.existsSync(HERMES_DIR)) {
     fs.mkdirSync(HERMES_DIR, {recursive: true});
   }
+  const podspec = 'hermes-engine.podspec';
   fs.copyFileSync(
-    path.join(SDKS_DIR, 'hermes-engine', 'hermes-engine.podspec'),
-    path.join(HERMES_DIR, 'hermes-engine.podspec'),
+    path.join(SDKS_DIR, 'hermes-engine', podspec),
+    path.join(HERMES_DIR, podspec),
+  );
+  const utils = 'hermes-utils.rb';
+  fs.copyFileSync(
+    path.join(SDKS_DIR, 'hermes-engine', utils),
+    path.join(HERMES_DIR, utils),
   );
 }
 

sdks/hermes-engine/hermes-engine.podspec

@@ -4,6 +4,7 @@
 # LICENSE file in the root directory of this source tree.
 
 require "json"
+require_relative "./hermes-utils.rb"
 
 react_native_path = File.join(__dir__, "..", "..")
 
@@ -24,13 +25,21 @@ import_hermesc_file=File.join(react_native_path, "sdks", "hermesc", "osx-bin", "
 source = {}
 git = "https://github.com/facebook/hermes.git"
 
+isInMain = version.include?('1000.0.0')
+isNightly = version.start_with?('0.0.0-')
+
 if ENV.has_key?('HERMES_ENGINE_TARBALL_PATH')
   Pod::UI.puts '[Hermes] Using pre-built Hermes binaries from local path.' if Object.const_defined?("Pod::UI")
   source[:http] = "file://#{ENV['HERMES_ENGINE_TARBALL_PATH']}"
-elsif version.include? '1000.0.0' || version.start_with?('0.0.0-')
+elsif isInMain
   Pod::UI.puts '[Hermes] Installing hermes-engine may take a while, building Hermes from source...'.yellow if Object.const_defined?("Pod::UI")
   source[:git] = git
   source[:commit] = `git ls-remote https://github.com/facebook/hermes main | cut -f 1`.strip
+elsif isNightly
+  Pod::UI.puts '[Hermes] Nightly version, download pre-built for Hermes'.yellow if Object.const_defined?("Pod::UI")
+  destination_path = download_nightly_hermes(react_native_path, version)
+  # set tarball as hermes engine
+  source[:http] = "file://#{destination_path}"
 elsif File.exists?(hermestag_file) && isInCI
   Pod::UI.puts '[Hermes] Detected that you are on a React Native release branch, building Hermes from source...'.yellow if Object.const_defined?("Pod::UI")
   hermestag = File.read(hermestag_file).strip

sdks/hermes-engine/hermes-utils.rb

@@ -0,0 +1,27 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+require 'net/http'
+require 'rexml/document'
+
+# This function downloads the nightly prebuilt version of Hermes based on the passed version
+# and save it in the node_module/react_native/sdks/downloads folder
+# It then returns the path to the hermes tarball
+#
+# Parameters
+# - react_native_path: the path to the React Native folder in node modules. It is used as root path to store the Hermes tarball
+# - version: the version of React Native that requires the Hermes tarball
+# Returns: the path to the downloaded Hermes tarball
+def download_nightly_hermes(react_native_path, version)
+    # TODO: convert hermes-ios to hermes-ios-debug
+    params = "r=snapshots\&g=com.facebook.react\&a=react-native-artifacts\&c=hermes-ios-debug\&e=tar.gz\&v=#{version}-SNAPSHOT"
+    tarball_url = "http://oss.sonatype.org/service/local/artifact/maven/redirect\?#{params}"
+
+    destination_folder = "#{react_native_path}/sdks/downloads"
+    destination_path = "#{destination_folder}/hermes-ios.tar.gz"
+
+    `mkdir -p "#{destination_folder}" && curl "#{tarball_url}" -Lo "#{destination_path}"`
+    return destination_path
+end