fix(hermes): change logic in build scripts for Apple to use the right…

… version (facebook#34710)

Summary:
Within the `hermes-engine.podspec` contained in the RN repo (at `react-native/main/sdks/hermes-engine/`), there's a bit of logic that triggers `./utils/build-ios-framework.sh` and `./utils/build-mac-framework.sh` .

The issue is that we all thought that that  `./utils/build-ios-framework.sh` would invoke the React native version of the scripts (since the podspec file lives right next to the `utils` folder) but, in reality, it doesn't. It just so happens that the Hermes repo has a root level `utils` folder which is (you guessed it) where the Hermes variation of those build scripts live.
So, when running the pod install command in a react-native project (build from source), it will go and download the hermes source code (since the `source[:git]` gets set) but then it will use the **hermes** variation of the `build-*.sh` scripts.

[Read more here](facebook#34513 (comment)).

This PR is taking kudo's proposed [patch here](reactwg/react-native-new-architecture#68 (reply in thread)) - props for the fix go to him.

## Changelog

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[iOS] [Fixed] -  Change hermes logic in build scripts for Apple to use the correct files

Pull Request resolved: facebook#34710

Test Plan: Tested by kudo in his work, and in my PR locally - [see here](facebook#34513 (comment)).

Reviewed By: cortinico

Differential Revision: D39647057

Pulled By: cipolleschi

fbshipit-source-id: 6520e248801a307ca2f8886a3853dd1ff4af193d

sdks/hermes-engine/hermes-engine.podspec

@@ -66,18 +66,25 @@ Pod::Spec.new do |spec|
   }
 
   if source[:git] then
+    ENV['REACT_NATIVE_PATH'] = react_native_path
+    hermes_utils_path = "/sdks/hermes-engine/utils"
+
     spec.prepare_command = <<-EOS
-    BUILD_TYPE=#{build_type.to_s.capitalize}
+    export BUILD_TYPE=#{build_type.to_s.capitalize}
+    export RELEASE_VERSION="#{version}"
+    export IOS_DEPLOYMENT_TARGET="#{spec.deployment_target('ios')}"
+    export MAC_DEPLOYMENT_TARGET="#{spec.deployment_target('osx')}"
+    export JSI_PATH="$REACT_NATIVE_PATH/ReactCommon/jsi"
 
     # Set HERMES_OVERRIDE_HERMESC_PATH if pre-built HermesC is available
     #{File.exist?(import_hermesc_file) ? "export HERMES_OVERRIDE_HERMESC_PATH=#{import_hermesc_file}" : ""}
     #{File.exist?(import_hermesc_file) ? "echo \"Overriding HermesC path...\"" : ""}
 
     # Build iOS framework
-    ./utils/build-ios-framework.sh
+    $REACT_NATIVE_PATH#{hermes_utils_path}/build-ios-framework.sh
 
     # Build Mac framework
-    ./utils/build-mac-framework.sh
+    $REACT_NATIVE_PATH#{hermes_utils_path}/build-mac-framework.sh
     EOS
   end
 end

sdks/hermes-engine/utils/build-apple-framework.sh

@@ -7,18 +7,28 @@
 NUM_CORES=$(sysctl -n hw.ncpu)
 IMPORT_HERMESC_PATH=${HERMES_OVERRIDE_HERMESC_PATH:-$PWD/build_host_hermesc/ImportHermesc.cmake}
 REACT_NATIVE_PATH=${REACT_NATIVE_PATH:-$PWD/../..}
-JSI_PATH="$REACT_NATIVE_PATH/ReactCommon/jsi"
+if [[ -z "$JSI_PATH" ]]; then
+  JSI_PATH="$REACT_NATIVE_PATH/ReactCommon/jsi"
+fi
+
+function use_env_var_or_ruby_prop {
+  if [[ -n "$1" ]]; then
+    echo "$1"
+  else
+    ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').$2"
+  fi
+}
 
 function get_release_version {
-  ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').version"
+  use_env_var_or_ruby_prop "${RELEASE_VERSION}" "version"
 }
 
 function get_ios_deployment_target {
-  ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').deployment_target('ios')"
+  use_env_var_or_ruby_prop "${IOS_DEPLOYMENT_TARGET}" "deployment_target('ios')"
 }
 
 function get_mac_deployment_target {
-  ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').deployment_target('osx')"
+  use_env_var_or_ruby_prop "${MAC_DEPLOYMENT_TARGET}" "deployment_target('osx')"
 }
 
 # Build host hermes compiler for internal bytecode

sdks/hermes-engine/utils/build-ios-framework.sh

@@ -5,7 +5,8 @@
 # LICENSE file in the root directory of this source tree.
 
 # shellcheck source=xplat/js/react-native-github/sdks/hermes-engine/utils/build-apple-framework.sh
-. ./utils/build-apple-framework.sh
+CURR_SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
+. "${CURR_SCRIPT_DIR}/build-apple-framework.sh"
 
 if [ ! -d destroot/Library/Frameworks/universal/hermes.xcframework ]; then
     ios_deployment_target=$(get_ios_deployment_target)

sdks/hermes-engine/utils/build-mac-framework.sh

@@ -5,7 +5,8 @@
 # LICENSE file in the root directory of this source tree.
 
 # shellcheck source=xplat/js/react-native-github/sdks/hermes-engine/utils/build-apple-framework.sh
-. ./utils/build-apple-framework.sh
+CURR_SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
+. "${CURR_SCRIPT_DIR}/build-apple-framework.sh"
 
 if [ ! -d destroot/Library/Frameworks/macosx/hermes.framework ]; then
     mac_deployment_target=$(get_mac_deployment_target)