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Cover image for Auto React-Native builds (CD) with Github-Actions and Fastlane
Sunim
Sunim

Posted on • Originally published at prep.surf

Auto React-Native builds (CD) with Github-Actions and Fastlane

#reactnative #javascript #android #ios

Scenario

We were deploying to both the Play Store and App Store manually, which was taking a lot of time. We were going to move with Travis and Code-push, but then we stumbled on the article by BigCheeseApp and we just could not help by trying it out. Special thanks to JonnyBurger for writing about the tricks and cases 🙏

Github Actions

Github Actions is the workflow automation tool with CI/CD that allows you to do some tasks, such as running the test suite, deploying code and etc based on the Github Events and Types. When an event is triggered, your defined workflow will be run and help you to do some awesome jobs.

Fastlane

fastlane is the easiest way to automate beta deployments and releases for your iOS and Android apps. 🚀 It handles all tedious tasks, like generating screenshots, dealing with code signing, and releasing your application.

Setting up Github Actions

Make sure to have a git repository setup with remote pointing to GitHub.

Creating Workflow

First, we will have to create a workflow in .github/workflows directory. Similar to other CI/CD services, you may configure the workflow using YAML syntax. Multiple workflow files can be created in the directory and each workflow must have at least a Job.

Now, let’s create a publish.yml workflow and put a name for the workflow.

    name: Publish iOS and Android App to App Store and Play Store
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Setting Trigger Event

We want to trigger the workflow when a Github Release is published. Thus, we will be using the release event in Github Actions to trigger our workflow. We want to trigger the workflow when the event is release and the activity type is published.

name: Publish React Native App to App Store and Play Store

on:
  release:
    type: [published]
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Creating Jobs and Defining Steps

Each workflow must have at least a Job. Since we are building iOS and Android app, let’s add two jobs: release-ios and release-android in the workflow.

    name: Publish React Native App to App Store and Play Store

    on:
      release:
        type: [published]

    jobs:
      release-ios:
        name: Build and release iOS app
        runs-on: macOS-latest
        steps:
          - uses: actions/checkout@v1
          - uses: actions/setup-node@v1
            with:
              node-version: '10.x'
          - uses: actions/setup-ruby@v1
            with:
              ruby-version: '2.x'
          - name: Install Fastlane
            run: bundle install
          - name: Install packages
            run: yarn install

      release-android:
        name: Build and release Android app
        runs-on: ubuntu-latest
        steps:
          - uses: actions/checkout@v1
          - uses: actions/setup-node@v1
            with:
              node-version: '10.x'
          - uses: actions/setup-ruby@v1
            with:
              ruby-version: '2.x'
          - name: Setup react-native kernel and increase watchers
            run: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
          - name: Install Fastlane
            run: bundle install
          - name: Install packages
            run: yarn install
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In the workflow above, we have added a few steps as follows:

  1. actions/checkout@v1 – Checkout the current repository.
  2. actions/setup-node@v1 – Install Node 10.x to run React Native >= 0.60
  3. actions/setup-ruby@v1 – Install Ruby 2.x for the usage of Fastlane
  4. Increasing the number of watchers - Increase the number of file watchers on the machine
  5. bundle install – Install Fastlane
  6. yarn install – Install NPM packages

Build and Publish Android app

There are 2 things that we need to build and publish an Android app:

Getting Google Credential Keys

  1. Open the Google Play Console
  2. Click the Settings menu entry, followed by API access and Click the CREATE SERVICE ACCOUNT Create Service Account
  3. Follow the Google Developers Console link in the dialog, which opens a new tab/window:
    1. Click the CREATE SERVICE ACCOUNT button at the top of the Google Developers Console
    2. Provide a Service account name Service Account name
    3. Click Select a role and choose Service Accounts > Service Account User Select A Role
    4. Click the Create Key button
    5. Make sure JSON is selected as the Key type
    6. Click Create and press Done Create Key
  4. Back on the Google Play Console, click DONE to close the dialog
  5. Click on Grant Access for the newly added service account
  6. Choose Release Manager from the Role dropdown and Click ADD USER to close the dialog

Encrypt the Google Credential Key

Now, rename the json file to google-private-key.json , add it into .gitignore and save it inside /android/app . So, we need to encrypt the key and keystore :

    gpg --symmetric --cipher-algo AES256 android/app/your-secret.json
    gpg --symmetric --cipher-algo AES256 android/app/your-keystore.keystore
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Script to decrypt the Google Credential Key

Let’s create a script to decrypt the Keystore and the Google Credential so that we can use them in our workflow. Create scripts/android-gpg-decrypt.sh and add the following codes:

    #!/bin/sh

    # --batch to prevent interactive command --yes to assume "yes" for questions
    gpg --quiet --batch --yes --decrypt --passphrase="$ENCRYPT_PASSWORD" \
    --output ./android/app/your-keystore.keystore ./android/app/your-keystore.keystore.gpg

    gpg --quiet --batch --yes --decrypt --passphrase="$ENCRYPT_PASSWORD" \
    --output ./android/app/your-secret.json ./android/app/your-secret.json.gpg
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Updating Workflow

The ENCRYPT_PASSWORD is the password that you used to encrypt your secret files and we will put it as an environment variable later. Now let’s add the remaining steps to complete the Android workflow.

    name: Publish React Native App to App Store and Play Store

    on:
      release:
        type: [published]

    jobs:
      release-ios:
        ...

      release-android:
        name: Build and release Android app
        runs-on: ubuntu-latest
        steps:
          ...
                - name: Jetifier AndroidX transition 
            run: npx jetify
                - name: Decrypt keystore and Google Credential
            run: sh ./scripts/android-gpg-decrypt.sh
            env:
              ENCRYPT_PASSWORD: ${{ secrets.GPG_ENCRYPT_PASSWORD }}
                - name: Dump secrets to .env
            run: env > .env
            env:
              REQUIRED_ENV: ${{ secrets.REQUIRED_ENV }}
          - name: Bundle and Upload to PlayStore
            run: bundle exec fastlane build_and_release_to_play_store versionName:${{ github.event.release.tag_name }}
            env:
                        VERSION_NAME: ${{ github.event.release.tag_name }}
              GITHUB_RUN_NUMBER: ${{ secrets.GITHUB_RUN_NUMBER }}
              STORE_PASSWORD: ${{ secrets.STORE_PASSWORD }}
              KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
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In the workflow above, we have added few steps as following:

  • To add environment variables in Github Actions, we can add env in the steps that need the variables. Github Secrets
  • We are using the name of the tag as the versionName of the app and GITHUB_RUN_NUMBER as the versionCode so, we have to modify android/app/build.gradle as: 
        defaultConfig {
                        ...
                        versionCode System.env.GITHUB_RUN_NUMBER.toInteger() ?: 1
                        versionName System.getenv("VERSION_NAME") ?: "0.1.0"
                        ...
        }
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  • We are dumping the required secrets to .env file as there might be cases where we need to input the secrets using react-native-dotenv
  • npx jetify was done for backward compatibility as some might be older packages

Updating Fastfile

We are almost there. Now create fastlane/Fastfile add the build_and_release_to_play_store action in the Fastfile.

    lane :build_and_release_to_play_store do |options|
      # Bundle the app
      gradle(
        task: 'bundle',
        build_type: 'Release',
        project_dir: "android/"
      )

      # Upload to Play Store's Internal Testing
      upload_to_play_store(
        package_name: 'com.example.app',
        track: "internal",
        json_key: "./android/app/your-secret.json",
        aab: "./android/app/build/outputs/bundle/release/app.aab"
      )
    end
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Build and Publish iOS app

To build an iOS app, we will need to sign the IPA before upload it to App Store Connect and there is no easy way of doing it in the CI/CD environment.

Update the fastlane directory

First, let's generate the Appfile, go into ios directory and then fastlane init. After completing, copy the Appfile into pre-existing folder fastlane in the root (if you have followed above android steps), else make new fastlane folder in the root and copy the Appfile and Fastfile.

PS. Copy the Gemfile and Gemfile.lock to root, and then delete both of them and the fastlane folder inside ios directory as well and edit the Gemfile as:

    source "https://rubygems.org"

    gem "fastlane"
    gem "cocoapods"
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Match(sync_code_signing) to generate new certificates

Fastlane provides the sync_code_signing action for us to handle the code signing easily. If you have not set up code signing before, please follow the codesigning guideline to generate your certificates and provisioning profiles or follow us:

  • Run fastlane match init
  • We are going to choose google_cloud bucket, cause adding it though private-github-repo is a pain in itself as we cannot change the SSH Fastlane Init
  • Once logged in, we create or switch to a project, if you have followed the android steps, you might already have a project and keys already setup, but we advice you to create a new one Switch Project
  • Now, copy the key paste it into project root, rename it as gc_keys.json add it into .gitignore. Then, create a bucket. Create Bucket
  • Enter the name of your bucket and then add the permission as Storage Admin to the service account previously created on step 3 Add Service email
  • Now, you will have a Matchfile in the fastlane directory, modify it as: 
        google_cloud_bucket_name("bucket-name")

        storage_mode("google_cloud")

        type("appstore") # The default type, can be: appstore, adhoc, enterprise or development

        app_identifier(["com.example.app"])
        username("apple-publish@email.com") # Your Apple Developer Portal username
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  • Before running match for the first time, you should consider clearing your existing profiles and certificates. Let's do that: 
        fastlane match nuke development
        fastlane match nuke distribution
        fastlane match nuke enterprise
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  • Now, run the following to generate new certificates and profiles: 
        fastlane match appstore
        fastlane match development
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Congratulations, you've successfully added new certificates named in the format as:
Match AppStore com.example.app and Match Development com.example.app

Encrypt the Google Credential Key 

    gpg --symmetric --cipher-algo AES256 gc_keys.json
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Script to decrypt the Google Credential Key

Now, let’s create a script to decrypt the gc_keys.json so that we can use them in our workflow. Create scripts/ios-gpg-decrypt.sh and add the following codes:

    #!/bin/sh

    gpg --quiet --batch --yes --decrypt --passphrase="$ENCRYPT_PASSWORD" \
    --output ./gc_keys.json ./gc_keys.json.gpg
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Updating Workflow

The ENCRYPT_PASSWORD is the password that you used to encrypt your secret files and we will put it as an environment variable later. Now let’s add the remaining steps to complete the iOS workflow.

    name: Publish React Native App to App Store and Play Store

    on:
      release:
        type: [published]

    jobs:
      release-ios:
        name: Build and release iOS app
        runs-on: macOS-latest
        steps:
          ...
                - name: Decrypt Google Cloud Key
            run: sh ./scripts/ios-gpg-decrypt.sh
            env:
              ENCRYPT_PASSWORD: ${{ secrets.GPG_ENCRYPT_PASSWORD }}
                - name: Dump secrets to .env
            run: env > .env
            env:
              REQUIRED_ENV: ${{ secrets.REQUIRED_ENV }}
          - name: Build and Upload to TestFlight
            run: bundle exec fastlane build_and_release_to_app_store versionName:${{ github.event.release.tag_name }}
            env:
                        VERSION_NAME: ${{ github.event.release.tag_name }}
              GITHUB_RUN_NUMBER: ${{ secrets.GITHUB_RUN_NUMBER }}
              FASTLANE_PASSWORD: ${{ secrets.FASTLANE_PASSWORD }}
              FASTLANE_SESSION: ${{ secrets.FASTLANE_SESSION }}
              FASTLANE_APPLE_APPLICATION_SPECIFIC_PASSWORD: ${{ secrets.FASTLANE_APPLE_APPLICATION_SPECIFIC_PASSWORD }}

      release-android:
        ...
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In the workflow above, we have added a few steps as follows:

  1. To add environment variables in Github Actions, we can add env in the steps that need the variables.
    Github Secrets

  2. We are using the name of the tag as the version_number of the app and GITHUB_RUN_NUMBER as the build_number

  3. FASTLANE_PASSWORD takes the actual app-store-connect password

  4. You must have the 2FA open on the account since we need to authorize it from the Github-Actions itself, so:

    • You need to generate a login session for Apple ID in advance by running fastlane spaceauth -u apple-publish@email.com. The generated value then has to be stored inside the FASTLANE_SESSION environment variable on your CI system. Please note:
      1. An Apple ID session is only valid for a certain region, meaning if your CI system is in a different region than your local machine, you might run into issues
      2. An Apple ID session is only valid for up to a month, meaning you'll have to generate a new session every month. Usually, you'd only know about it when your build starts failing
    • If you want to upload builds to App Store Connect or TestFlight from your CI machine, you need to generate an application-specific password:
      1. Visit appleid.apple.com/account/manage
      2. Generate a new application-specific password
      3. Provide the password by  FASTLANE_APPLE_APPLICATION_SPECIFIC_PASSWORD

  5. We are dumping the required secrets to .env file as there might be cases where we need to input the secrets using react-native-dotenv

Updating Fastfile

Now let’s add build_and_release_to_app_store actions into Fastfile.

    lane :buid_and_release_to_play_store do |options|
      ...
    end

    lane :build_and_release_to_app_store do |options|
        # Pod Install
      cocoapods(
        podfile: "./ios/Podfile"
      )

        # Set the build number
      increment_build_number(
        build_number: ENV["GITHUB_RUN_NUMBER"],
        xcodeproj: "./ios/app.xcodeproj"
      )

      # Set the version name
      increment_version_number(
        version_number: ENV["VERSION_NAME"],
        xcodeproj: "./ios/app.xcodeproj"
      )

      # Create a custom keychain for code signing
      create_keychain(
        name: 'keychain',
        password: 'password',
        default_keychain: true,
        unlock: true,
        timeout: 3600,
        add_to_search_list: true
      )

      # Import the appstore code signing
      match(
        type: "appstore",
        keychain_name: 'keychain',
        keychain_password: 'password',
            app_identifier: ["com.example.app"],
        readonly: true
      )

        # Disable automatic signing
        update_code_signing_settings(
        use_automatic_signing: false,
        path: "./ios/app.xcodeproj"
      )

        # Building the iOS app
      gym(
        workspace: "./ios/app.xcworkspace",
        include_bitcode: true,
        include_symbols: true,
        silent: true,
        clean: true,
        scheme: "App",
        export_method: "app-store",
        xcargs: {
          PROVISIONING_PROFILE_SPECIFIER: "match AppStore com.example.app"
        }
      )

        # Enable automatic signing
        update_code_signing_settings(
        use_automatic_signing: true,
        path: "./ios/app.xcodeproj"
      )

      # Upload to testflight
      testflight(
        app_identifier: "com.example.app",
        username: "apple-publish@email.com",
        skip_submission: true,
        skip_waiting_for_build_processing: true
      )
    end
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In the Fast-file above, we have added a few steps as follows:

  1. Remember we add the cocopods gem earlier, we are going to use it now for pod install
  2. We create a custom-keychain to store the provisioning certificates, however, we had set match as readonly so that we only extract the previously created certificates, rather than regenerating new ones
  3. Also use_automatic_signing is set to false cause there higher chance than your .xcodeproj has set it so, and if we don't do that, we cannot append our PROVISIONING_PROFILE_SPECIFIER. To eradicate this, you can uncheck the Automatic Signing and set the Provisioning Profile here. Manual Signing

Testing Your Workflow

To test your workflow, you can create a Release and go to the Actions tab in Github to view the log of your workflow.

Watching the logs

Watching the logs scroll up the window is a very satisfying feeling. Recently, Github Actions started supporting streaming the logs, but there is one big caveat. You can only see the logs that were printed after you loaded the page.

https://miro.medium.com/max/1400/1*cnHqK_X8SSGIrBrWUDZA0g.png

Final Notes

Github-Actions is good, while the pricing side it's good:

  • On the Linux/Docker front, you get 2000 minutes for free (3000 minutes with a Pro subscription)
  • Building on macOS, you pay per minute, which means it’s a lot cheaper if you stay under 500 minutes

However, Use GitHub actions at your own risk as said by Julien Renaux, cause the secrets approach is quite flimsy, heard they are working on an API to fix that exactly🤞. We can only hope.

Thanks for giving this a read. We will continue to keep you posted on the updates and cool stuff.

Until next time 👋

Sunim - https://prep.surf/blog/auto-build-github-action

Top comments (5)

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saku_tech profile image
sakutech •

Thanks for very useful post.

I think it's probably typo.

on:
  release:
    type: [published]
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↓

on:
  release:
    types: [published]　　　<--
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realabbas profile image
Ali Abbas •

Nice post. Thanks for sharing

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yungkittty profile image
Quentin Woivre •

Great job ! Thanks a lot !

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ensargunesdogdu profile image
Ensar Güneşdoğdu •

Great post, helped me a lot.

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mishrabhavesh profile image
Bhavesh Mishra •

great post

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