duplicate pod hook

[mackyo88]

if my existed project podfile have pod hook like ---"post_install...", because the flutter file "podhelper.rb" has pod hook too, when I "pod install" ,pod will told error like "duplicate pod hook...".

[zoechi]

Please add the output of flutter doctor -v.

[kangwang1988]

@zoechi
It's an already known bug. The podhelper.rb will conflict with user defined post_Install hook.

[Sunzxyong]

We parsed the Generated.xcconfig file, then exported the attribute values to the environment variables in the proxy script, and finally executed the xcode_back.sh script through the proxy script so that it could read the environment variables.

[jkmathew]

@zoechi, Adding my flutter doctor -v result here

$ flutter doctor -v
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.14.2 18C54, locale en-DE)
    • Flutter version 1.0.0 at /usr/local/custom/flutter
    • Framework revision 5391447fae (7 weeks ago), 2018-11-29 19:41:26 -0800
    • Engine revision 7375a0f414
    • Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297)

[✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
    • Android SDK at /Users/johnnykuttymathew/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling
      support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_152-release-1136-b06)
    • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 9.4.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.4.1, Build version 9F2000
    • ios-deploy 1.9.4
    • CocoaPods version 1.5.3

[✓] Android Studio (version 3.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 31.3.1
    • Dart plugin version 181.5656
    • Java version OpenJDK Runtime Environment (build
      1.8.0_152-release-1136-b06)

[✓] Connected device (1 available)
    • iPhone X • E098AA34-867B-4462-A380-41B294E2BA6A • ios • iOS 11.4
      (simulator)

• No issues found!

@kangwang1988, I would like to know if there is any workarounds possible to fix this issue?

Regards,
Johny

[kangwang1988]

# Ensure that ENABLE_BITCODE is set to NO, add a #include to Generated.xcconfig, and
# add a run script to the Build Phases.
post_install do |installer|
    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            config.build_settings['ENABLE_BITCODE'] = 'NO'
            xcconfig_path = config.base_configuration_reference.real_path
            File.open(xcconfig_path, 'a+') do |file|
                file.puts "#include \"#{File.realpath(File.join(framework_dir, 'Generated.xcconfig'))}\""
            end
        end
    end
end

The code snippet from podhelper.rb is given above. That's why there would be a duple post_install conflicts.
In fact, it doesn't do much job. Two things:
a. Disable ENABLE_BITCODE
As now flutter doesn't support bitcode, you need to disable the bitcode flag for your target.
b. Import the Generated.xcconfig into your xcconfig file
Generated.xcconfig is controlled by flutter and contains the flutter related environment variable.

So for now, a workaround you can use is to remove the post_install hook in podhelper.rb and do a(disable bitcode) and b(import Generated.xcconfig).

@jkmathew

[jkmathew]

Thank you @kangwang1988 for the work around.

I tried something bit different. May be not the proper solution. But I think can fix it easily.

Instead of adding post_install hook directly to podhelper.rb, I changed the hook to a function and calling that function from post_install hook in the Podfile. So that if native app wants to add something to the post_install, can do so.

Now my Podfile looks like

platform :ios, '9.0'

$flutter_path = '../store_locator/'

def flutter_pods
    # Doing this because in 'podhelper.rb' ise taking flutter_application_path if not set, but it is not correct
    # Line #37 in 'podhelper.rb'
    flutter_application_path = $flutter_path
    eval(File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')), binding)
end

target 'HelloFlutter' do
  use_frameworks!
  pod 'RxSwift'
  pod 'PlayerView'
  
  
  flutter_pods
  
end

post_install do |installer|
    framework_dir = File.join($flutter_path, '.ios', 'Flutter')
    update_configs(installer, framework_dir)
    
    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            if ['PlayerView'].include? target.name then
                config.build_settings['SWIFT_VERSION'] = '3.2'
            end
        end
    end
end

and the podhelper.rb looks like

.... 
....
# Ensure that ENABLE_BITCODE is set to NO, add a #include to Generated.xcconfig, and
# add a run script to the Build Phases.
def update_configs(installer, framework_dir)

    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            config.build_settings['ENABLE_BITCODE'] = 'NO'
            xcconfig_path = config.base_configuration_reference.real_path
            File.open(xcconfig_path, 'a+') do |file|
                file.puts "#include \"#{File.realpath(File.join(framework_dir, 'Generated.xcconfig'))}\""
            end
        end
    end
end

I am not sure about whether this is an optimal way.. but could be better than now.

[kangwang1988]

@jkmathew
File a pr and cc dnfield and me please.
We can discuss more about this.

[JaminZhou]

I temporarily solved this conflict. Put the code in your Podfile.

def multiple_post_install(flutter_application_path)
  #read podhelper from flutter_application_path
  flutter_podhelper = File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb'))
  
  #find the post_install end location by hardcoding
  post_install_string = 'post_install do |installer|'
  location = flutter_podhelper.index(post_install_string)
  location += post_install_string.length
  
  #declare your own hook func
  update_configs_func = %q[
  update_configs(installer)]
  
  #insert the func you declare
  flutter_podhelper.insert(location, update_configs_func)
  return flutter_podhelper
end

flutter_application_path = 'path/to/my_flutter/'
flutter_podhelper = multiple_post_install(flutter_application_path)
eval(flutter_podhelper, binding)

def update_configs(installer)
  #put your own custom code
end