[TIMOB-24345] iOS: Today Extensions cannot access App Group UserDefaults or DirectoryForSuite

On trying to implement a Today Extension and share data, i have set up an App Group and tried using Ti.App.iOS.UserDefaults, Ti.Filesystem.directoryForSuite & Ti.Wormhole all of which failed. I setup an empty XCode project called Amy Today with a Today Extension target called Amy Reminders. Having changed the target capabilities for the App Group accordingly, a Amy Today.entitlements file was created. I included the extensions using the following in the TiApp.xml:

<extensions>
    <extension projectPath="extensions/Amy Today/Amy Today.xcodeproj">
        <target name="Amy Reminders">
            <provisioning-profiles>
                <device/>
                <dist-appstore/>
                <dist-adhoc/>
            </provisioning-profiles>
        </target>
    </extension>
</extensions>

I ran the project and tested and discovered the data was being written to the appropriate App Group folder/plist correctly from the app but could not be read by the Today Extension. On further investigation I realised that a new Amy Reminders.entitlements file was being created in a new folder within the build folder and this was being included in the built project not the actual entitlements file (see attached picture - red was the one included in the project, green is the one that should have been included.) I delved into the 6.0.1.GA/iphone/cli/commands/_build.js file and discovered on line 3434 the variable entFile contained Amy Reminders/Amy Reminders.entitlement which meant the following lines that join entFile with targetName was creating this new file. This new file did not contain the key com.apple.security.application-groups which meant the Today Extension did not have the appropriate security entitlements to read the shared data. I removed the targetName from the path.join as follows:

extBuildSettings.CODE_SIGN_ENTITLEMENTS = '"' + path.join(ext.relPath, entFile) + '"';
targetInfo.entitlementsFile = path.join(this.buildDir, ext.relPath, entFile);

and the Today Extension had the correct entitlements and could read the shared data. I'm not sure if the above fix is correct as I have not tested it with Watch Extensions. Hope the above helps in the investigation on fixing this problem.