Automatic build versioning

Codemagic Automatic build versioning

How to set a new build number to push to app stores

If you are going to publish your app to App Store Connect or Google Play, each uploaded artifact must have a new version satisfying each app store’s requirements. You’ll need to devise a build versioning strategy that satisfies the App Store and/or Google Play Store versioning requirements and works for your team’s development processes. On this page, we will explain the App Store and Google Play build versioning requirements, how the Flutter framework generalizes build versioning, and various strategies to set your build versions using Codemagic. See the build versioning codemagic blog article for a detailed overview.

Overview of Build Versioning Requirements

App Store Connect Requirements

The main values for iOS & macOS versioning are CFBundleShortVersionString (Release Version Number) and CFBundleVersion (Build Version Number). The best explanation of these two values, despite being outdated, is Apple’s technical note on Version Numbers and Build Numbers.

CFBundleShortVersionString, Release Version Number, is the external user facing release version of your app displayed in the App Store. It must follow the {major}.{minor}.{patch} version format of three period separated integers. This must be incremented every time you release a version to the App Store. It’s advisable to commit this value to version control and update it for every new release of your app to the App Store.

CFBundleVersion, Build Version Number, is the internal build version number of your application used for testing and development. It appears in {major}.{minor}.{patch} format of one to three period separated integers. If {minor}.{patch} are not provided, then they will default to zero. Build version number must be incremented with every release candidate submitted to TestFlight for a particular release version number. For iOS, build version number can be reused across different release version numbers while for macOS, build version number must be unique across all release version numbers. This value is best incremented and set by your CI/CD pipeline for every build you’re submitting to TestFlight.

Google Play Requirements

You can find the Google Play build versioning requirements in the Android documentation. The important values defined in the build.gradle file are versionName and versionCode.

versionName is a text based, external, version of your app that is displayed to users and visible in Google Play. There are no restrictions for versionName, so you should choose something that makes sense for you and your users, such as {major}.{minor}.{patch} versioning. It’s advisable to commit this value to version control and update it for every new release of your app to the Play Store.

versionCode is an internal version of your app that must be an integer value between 1 and 2100000000. This must be incremented for every build you upload to Google Play. This value is best incremented and set by your CI/CD pipeline for every build.

Flutter Build Versioning

Flutter generalizes iOS and Android build versioning with the pubspec.yaml version property. This is a value in the form {major}.{minor}.{patch}+{build_number} (e.g. 1.2.3+45). In Flutter builds, the value for build name, {major}.{minor}.{patch}, sets CFBundleShortVersionString for iOS and versionName for Android. While the optional build number, {build_number}, sets CFBundleVersion for iOS and versionCode for Android. With flutter build commands these values can be overridden with the command line arguments --build-name and --build-number or by setting the environment variables FLUTTER_BUILD_NAME and FLUTTER_BUILD_NUMBER.

In order to complete an automatic build versioning process for Flutter iOS apps, make sure the following keys along with their string values are set in ios/Runner/info.plist:

<key>CFBundleShortVersionString</key>
<string>$(FLUTTER_BUILD_NAME)</string>
<key>CFBundleVersion</key>
<string>$(FLUTTER_BUILD_NUMBER)</string>

It is advisable to set your build version (e.g. 1.2.3) in the pubspec.yaml version property and commit this to version control, as this will only change on every app release. On the other hand, you should consider having your CI/CD pipeline increment and set build number automatically, as this should be updated for every build.

Build versioning in Codemagic

Environment variables

There are several approaches you can use for build versioning on Codemagic. One of the easiest ways to increment the application version on every build is by using the environment variables that Codemagic exports during the build. There are two environment variables that count the number of builds:

BUILD_NUMBER. Holds the total count of builds (including the ongoing build) for a specific workflow in Codemagic. In other words, if you have triggered 10 builds for some workflow in Codemagic, the next time you build it, BUILD_NUMBER will be exported as 11.
PROJECT_BUILD_NUMBER. Holds the total count of builds (including the ongoing build) for a project (application) in Codemagic. In contrast with BUILD_NUMBER, PROJECT_BUILD_NUMBER will increase every time you build any of the workflows of the app.

Flutter
Xcode

For Flutter, you can easily increment your build number and build name using the PROJECT_BUILD_NUMBER by passing the following to the build arguments:

--build-name=1.0.$PROJECT_BUILD_NUMBER --build-number=$PROJECT_BUILD_NUMBER

Note that if the build version is manually incremented in pubspec.yaml, these arguments do not need to be passed to the build command.

If you’ve added an existing project to Codemagic and need to offset the build number by the current build number, i.e. 200, then you can pass the following argument to correctly increment your build number.

--build-number=$(($PROJECT_BUILD_NUMBER + 200))

You can use the Xcode command line agvtool to set the next build version name for your build.

  scripts:
    - name: Set the build version
      script: | 
        #!/bin/sh
        set -e
        set -x
        cd $CM_BUILD_DIR
        agvtool new-version -all $(($BUILD_NUMBER + 1))

App Store or TestFlight latest build number

Using Codemagic CLI tools it is possible to get the latest build number from App Store or from TestFlight so you can automatically increment the build version in your workflow. For more details, check the get-latest-app-store-build-number or get-latest-testflight-build-number actions from app-store-connect Codemagic CLI Tool.

In order to allow Codemagic to connect to your App Store Connect account, you need to provide API access to App Store Connect API. It is possible that some of these environment variables are already configured as part of the iOS code signing configuration.

Creating the App Store Connect API key

It is recommended to create a dedicated App Store Connect API key for Codemagic in App Store Connect. To do so:

Log in to App Store Connect and navigate to Users and Access > Integrations » App Store Connect API.
Click on the + sign to generate a new API key.
Enter the name for the key and select an access level. We recommend choosing App Manager access rights, read more about Apple Developer Program role permissions here.
Click Generate.
As soon as the key is generated, you can see it added to the list of active keys. Click Download API Key to save the private key for later. Note that the key can only be downloaded once.

Take note of the Issuer ID above the table of active keys as well as the Key ID of the generated key as these will be required when setting up the Apple Developer Portal integration in the Codemagic UI.

Configuring the API access variables

Configure the following environment variables if they are missing from your Codemagic UI:

APP_STORE_CONNECT_KEY_IDENTIFIER
In App Store Connect > Users and Access > Keys, this is the Key ID of the key.
APP_STORE_CONNECT_ISSUER_ID
In App Store Connect > Users and Access > Keys, this is the Issuer ID displayed above the table of active keys.
APP_STORE_CONNECT_PRIVATE_KEY
This is the private API key downloaded from App Store Connect.
APP_APPLE_ID
Automatically generated ID assigned to your app, e.g. 1234567890. It can be found under General > App Information > Apple ID under your application in App Store Connect.

Follow these steps to configure the above variables for your Codemagic app:

codemagic.yaml
Flutter workflow editor

Open your Codemagic app settings, and go to the Environment variables tab.
Enter the desired Variable name, e.g. APP_STORE_CONNECT_KEY_IDENTIFIER.
Enter the variable value as Variable value.
Enter the variable group name, e.g. app_store_credentials. Click the button to create the group.
Make sure the Secure option is selected.
Click the Add button to add the variable.
Repeat the steps to also add all of the above variables.
Add the variable group to your codemagic.yaml file

  environment:
    groups:
      - app_store_credentials

Add the following environment variables to your Flutter project in App settings > Environment variables (See the details here):

APP_STORE_CONNECT_ISSUER_ID
APP_STORE_CONNECT_KEY_IDENTIFIER
APP_STORE_CONNECT_PRIVATE_KEY
APP_APPLE_ID

Tip: Alternatively, each property can be specified in the scripts section of the YAML file as a command argument to programs with dedicated flags. See the details here. In that case, the environment variables will be fallbacks for missing values in scripts.

Set the build number with `agvtool`

Once you have the App Store Connect API access configured, you can get the build number using the CLI tool and set your incremented project version.

Add the following script under your scripts field for codemagic.yaml, or as a custom Pre-build script in the Flutter workflow editor:

  scripts:
    - name: Get the latest build number
      script: | 
        LATEST_BUILD_NUMBER=$(app-store-connect get-latest-app-store-build-number $APP_APPLE_ID)
        cd ./ios # avgtool must run in the folder where xcodeproj file is located
        agvtool new-version -all $(($LATEST_BUILD_NUMBER + 1))

Tip: Helpful optional arguments:

--app-store-version=APP_STORE_VERSION to get the latest build number for a particular version of your application (CFBundleShortVersionString)
--platform=IOS | MAC_OS | TV_OS to specify which platform to get the latest build number

Check the details for get-latest-app-store-build-number or for get-latest-testflight-build-number.

Alternatively, if you use YAML configuration, you may just export the value to an environment variable and use it under your CFBundleVersion in Info.plist.

Google Play latest build number

Use google-play get-latest-build-number action from Codemagic CLI tools to get the latest build number from Google Play Console.

In order to do that, you need to provide Google Play API access credentials by providing GCLOUD_SERVICE_ACCOUNT_CREDENTIALS as arguments to the action, as defined below.

Additionally, you will need to provide the package name of the app in Google Play Console (Ex. com.example.app).

Creating Google service account credentials

You will need to set up a service account in Google Play Console and create a JSON key with credentials. See how to set up a service account and create a key.

Configuring the API access environment variables

codemagic.yaml
Flutter workflow editor

Open your Codemagic app settings, and go to the Environment variables tab.
Enter the GCLOUD_SERVICE_ACCOUNT_CREDENTIALS as Variable name.
Copy and paste the credentials content as Variable value.
Enter the variable group name, e.g. google_play_credentials. Click the button to create the group.
Make sure the Secure option is selected.
Click the Add button to add the variable.
Add the variable group to your codemagic.yaml file

  environment:
    groups:
      - google_play_credentials

Add the GCLOUD_SERVICE_ACCOUNT_CREDENTIALS environment variable to your Flutter project in App settings > Environment variables (See the details here).

Tip: Alternatively, credentials can be specified as a command argument with the dedicated flag, see the details here. In any case, it is advisable to save the service account credentials file to an environment variable so that it can be accessed during a build without committing it to version control. The environment variable will be a fallback for the missing value in the script.

Set the build number

Once you have the Google Play Developer API access set, you can get the build number using the CLI tool:

LATEST_BUILD_NUMBER=$(google-play get-latest-build-number --package-name 'com.example.app')

Note: By default, the action will try to get the latest build number as the maximum build number across all tracks (internal, alpha, beta, production, and custom tracks, if available). If you want to limit the search, you can specify particular tracks with the optional argument --tracks described here.

There are a number of ways how you can pass the obtained build number to an Android project (through environment variables, gradlew argument properties, file, or a call from build.gradle). Check the android-versioning-example repository for more details. Here is an example using gradlew arguments:

Edit your build.gradle file by adding the functions to read version name and code number from argument properties

// get version code from the specified property argument `-PversionCode` during the build call
def getMyVersionCode = { ->
    return project.hasProperty('versionCode') ? versionCode.toInteger() : -1
}
// get version name from the specified property argument `-PversionName` during the build call
def getMyVersionName = { ->
    return project.hasProperty('versionName') ? versionName : "1.0"
}

....
android {
    ....
    defaultConfig {
        ...
        versionCode getMyVersionCode()
        versionName getMyVersionName()

Add a script to your codemagic.yaml file to set the build number and pass it to gradlew command

scripts:
  - name: Build Android release
    script: | 
      LATEST_GOOGLE_PLAY_BUILD_NUMBER=$(google-play get-latest-build-number --package-name "$PACKAGE_NAME")
      if [ -z $LATEST_GOOGLE_PLAY_BUILD_NUMBER ]
        then
          # fallback in case no build number was found from Google Play.
          # Alternatively, you can `exit 1` to fail the build
          # BUILD_NUMBER is a Codemagic built-in variable tracking the number of
          # times this workflow has been built
          UPDATED_BUILD_NUMBER=$BUILD_NUMBER
        else
          UPDATED_BUILD_NUMBER=$(($LATEST_GOOGLE_PLAY_BUILD_NUMBER + 1))
      fi
      cd android # change folder if needed 
      ./gradlew bundleRelease -PversionCode=$UPDATED_BUILD_NUMBER -PversionName=1.0.$UPDATED_BUILD_NUMBER

Get the build number in the Flutter workflow editor

Provided you have exported your Google Play Console service account credentials as an environment variable GCLOUD_SERVICE_ACCOUNT_CREDENTIALS, you can call it immediately as a build argument to your Android build command to increment the build number:

--build-number=$(($(google-play get-latest-build-number --package-name 'com.example.app') + 1))

Alternatively, you can add a custom Pre-build script and write the build number to a file, which will be read from your android/app/build.gradle during the build (See details here).

Firebase App Distribution latest build version

Use firebase-app-distribution get-latest-build-version action from Codemagic CLI tools to get the latest build version from Firebase App Distribution.

In order to do that, you need to provide Firebase access credentials by providing FIREBASE_SERVICE_ACCOUNT_CREDENTIALS as arguments to the action, as defined below.

Additionally, you will need to provide project ID (e.g. 228333310124) and application ID (e.g. 1:228333310124:ios:5e439e0d0231a788ac8f09).

Creating Firebase service account credentials

You will need to set up a Firebase service account.

Configuring the API access environment variables

codemagic.yaml
Flutter workflow editor

Open your Codemagic app settings, and go to the Environment variables tab.
Enter the FIREBASE_SERVICE_ACCOUNT_CREDENTIALS as Variable name.
Copy and paste the credentials content as Variable value.
Enter the variable group name, e.g. firebase_credentials. Click the button to create the group.
Make sure the Secure option is selected.
Click the Add button to add the variable.
Add the variable group to your codemagic.yaml file

  environment:
    groups:
      - firebase_credentials

Add the FIREBASE_SERVICE_ACCOUNT_CREDENTIALS environment variable to your Flutter project in App settings > Environment variables (See the details here).

Set the build version for iOS projects using `agvtool`

Add the following script under your scripts field for codemagic.yaml, or as a custom Pre-build script in the Flutter workflow editor:

  scripts:
    - name: Get the latest build number
      script: |
        LATEST_BUILD_VERSION=$(firebase-app-distribution get-latest-build-version -p 228333310124 -a 1:228333310124:ios:5e439e0d0231a788ac8f09)
        cd ./ios # avgtool must run in the folder where xcodeproj file is located
        agvtool new-version -all $(($LATEST_BUILD_VERSION + 1))

Alternatively, if you use YAML configuration, you may just export the value to an environment variable and use it under your CFBundleVersion in Info.plist.

Set the build version for Android projects

Once you have the Firebase access set, you can get the build version using the CLI tool:

LATEST_BUILD_VERSION=$(firebase-app-distribution get-latest-build-version -p 228333310124 -a 1:228333310124:ios:5e439e0d0231a788ac8f09)

There are a number of ways how you can pass the obtained build version to an Android project (through environment variables, gradlew argument properties, file, or a call from build.gradle). Here is an example using gradlew arguments:

Edit your build.gradle file by adding the functions to read version name and code number from argument properties

// get version code from the specified property argument `-PversionCode` during the build call
def getMyVersionCode = { ->
    return project.hasProperty('versionCode') ? versionCode.toInteger() : -1
}
// get version name from the specified property argument `-PversionName` during the build call
def getMyVersionName = { ->
    return project.hasProperty('versionName') ? versionName : "1.0"
}

....
android {
    ....
    defaultConfig {
        ...
        versionCode getMyVersionCode()
        versionName getMyVersionName()

Add a script to your codemagic.yaml file to set the build version and pass it to gradlew command

scripts:
  - name: Build Android release
    script: |
      LATEST_FIREBASE_BUILD_VERSION=$(firebase-app-distribution get-latest-build-version -p "$PACKAGE_ID" -a "$APPLICATION_ID")
      if [ -z $LATEST_FIREBASE_BUILD_VERSION ]
        then
          # Fallback in case no build version was found at Firebase.
          # Alternatively, you can `exit 1` to fail the build.
          # BUILD_NUMBER is a Codemagic built-in variable tracking the number of
          # times this workflow has been built
          UPDATED_BUILD_VERSION=$BUILD_NUMBER
        else
          UPDATED_BUILD_VERSION=$(($LATEST_FIREBASE_BUILD_VERSION + 1))
      fi
      cd android # change folder if needed
      ./gradlew bundleRelease -PversionCode=$UPDATED_BUILD_VERSION -PversionName=1.0.$UPDATED_BUILD_VERSION

Get the build version in the Flutter workflow editor

Provided you have exported your Firebase service account credentials as an environment variable FIREBASE_SERVICE_ACCOUNT_CREDENTIALS, you can call it immediately as a build argument to your Android build command to increment the build version:

--build-number=$(($(firebase-app-distribution get-latest-build-version -p 228333310124 -a 1:228333310124:ios:5e439e0d0231a788ac8f09) + 1))

Alternatively, you can add a custom Pre-build script and write the build version to a file, which will be read from your android/app/build.gradle during the build (see details here).

Automatic build versioning

Overview of Build Versioning Requirements

App Store Connect Requirements

Google Play Requirements

Flutter Build Versioning

Build versioning in Codemagic

Environment variables

App Store or TestFlight latest build number

Creating the App Store Connect API key

Configuring the API access variables

Set the build number with agvtool

Google Play latest build number

Creating Google service account credentials

Configuring the API access environment variables

Set the build number

Get the build number in the Flutter workflow editor

Firebase App Distribution latest build version

Creating Firebase service account credentials

Configuring the API access environment variables

Set the build version for iOS projects using agvtool

Set the build version for Android projects

Get the build version in the Flutter workflow editor

Getting help and support

Set the build number with `agvtool`

Set the build version for iOS projects using `agvtool`