Setting Up Code Signing for iOS Projects
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This document describes the guidelines for setting up code signing for your iOS project on CircleCI.
Basic configuration of iOS projects
This document assumes that you already have an iOS project building correctly on CircleCI using our recommended best practices. It also assumes that you use Bundler and Fastlane, and have a
Fastfile checked into your repo.
If you have not yet configured your iOS project on CircleCI, you can find the configuration instructions in the Testing iOS Applications document.
Note: CircleCI only officially supports Fastlane Match for code signing. Other methods may be used, but are not guaranteed to work and are unsupported.
Setting up Fastlane Match
Code signing must be configured to generate ad-hoc distributions of your app and App Store builds.
Fastlane Match is one of the Fastlane tools, and it allows for seamless configuration for code signing in both your local development environment and on CircleCI. Fastlane Match stores all of your code signing certificates and provisioning profiles in a git repository/AWS S3 Bucket/Google Cloud Storage, and downloads and installs the necessary certificates and profiles when required.
In this example configuration, we will set up and use a git repository for storage.
To set up Fastlane Match:
- On your local machine, open Terminal and navigate to the root directory of your repository
bundle exec fastlane match init
- Follow the instructions to configure the Match repository
- After the above is complete, run
bundle exec fastlane match developmentto generate and install the Development certificates and profiles
- Then, run
bundle exec fastlane match adhocto generate and install the Ad-hoc distribution certificates and profiles.
Preparing your Xcode project for use with Fastlane Match
Before setting up Match you must ensure that the code signing settings in your Xcode project are configured as follows:
- Signing & Capabilities -> Signing uncheck Automatically manage signing for both Debug and Release
- Signing & Capabilities -> Provisioning Profile choose the appropriate profile created by Fastlane Match (e.g.,
match adhoc com.circleci.helloworld)
Adding Match to the Fastlane lane
On CircleCI, Fastlane Match will need to be run every time you build and sign your app. The easiest way to do this is to add the
match action to the lane which builds your app.
Note: For the
match action to work correctly, you must add
before_all in your
Fastfile. This ensures that a temporary Fastlane keychain with full permissions is used. Without using this you may see build failures or inconsistent results.
# fastlane/Fastfile default_platform :ios platform :ios do before_all do setup_circle_ci end desc "Build and run tests" lane :test do scan end desc "Ad-hoc build" lane :adhoc do match(type: "adhoc") gym(export_method: "ad-hoc") end ... end
Adding a user key to the CircleCI project
To enable Fastlane Match to download the certificates and the keys from GitHub, it is necessary to add a user key with access to both the project repo and the certificates / keys repo to the CircleCI project.
To add a user key:
- In the CircleCI application, go to your project’s settings by clicking the the Project Settings button (top-right on the Pipelines page of the project).
- On the Project Settings page, click on SSH Keys (vertical menu on the left).
- Click the Add User Key button and follow the steps to authorize CircleCI
Note: This action will give the CircleCI project the same GitHub permissions as the user who will be clicking the Authorize with GitHub button.
git_url should be an SSH URL ( in the
firstname.lastname@example.org:... format), rather than a HTTPS URL. Otherwise you may see authentication errors when you attempt to use match. For example:
git_url("email@example.com:fastlane/certificates") app_identifier("tools.fastlane.app") username("firstname.lastname@example.org")
It is best practice to create a machine user with access to just the project repo and the keys repo, and use that machine user to create a user key to reduce the level of GitHub access granted to the CircleCI project.
After you have added a user key, CircleCI will be able to checkout both the project repo and the Fastlane Match repo from GitHub.
Adding the Match passphrase to the project
To enable Fastlane Match to decrypt the certificates and profiles stored in the GitHub repo, it is necessary to add the encryption passphrase that you configured in the Match setup step to the CircleCI project’s environment variables.
In the project settings on CircleCI, click on Environment Variables and add the
MATCH_PASSWORD variable. Set its value to your encryption passphrase. The passphrase will be stored encrypted at rest.
Building and code-signing the app on CircleCI
After you have configured Match and added its invocation into the appropriate lane, you can run that lane on CircleCI. The following
config.yml will create an Ad-hoc build every time you push to the
# .circleci/config.yml version: 2 jobs: build-and-test: macos: xcode: 12.5.1 steps: # ... - run: bundle exec fastlane test adhoc: macos: xcode: 12.5.1 steps: # ... - run: bundle exec fastlane adhoc workflows: version: 2 build-test-adhoc: jobs: - build-and-test - adhoc: filters: branches: only: development requires: - build-and-test
Sample configuration files
The best practice configuration for setting up code signing for iOS projects is as follows:
# fastlane/fastfile default_platform :ios platform :ios do before_all do setup_circle_ci end desc "Runs all the tests" lane :test do scan end desc "Ad-hoc build" lane :adhoc do match(type: "adhoc") gym(export_method: "ad-hoc") end end
# .circleci/config.yml version: 2.1 jobs: build-and-test: macos: xcode: 12.5.1 environment: FL_OUTPUT_DIR: output FASTLANE_LANE: test steps: - checkout - run: bundle install - run: name: Fastlane command: bundle exec fastlane $FASTLANE_LANE - store_artifacts: path: output - store_test_results: path: output/scan adhoc: macos: xcode: 12.5.1 environment: FL_OUTPUT_DIR: output FASTLANE_LANE: adhoc steps: - checkout - run: bundle install - run: name: Fastlane command: bundle exec fastlane $FASTLANE_LANE - store_artifacts: path: output workflows: build-test-adhoc: jobs: - build-and-test - adhoc: filters: branches: only: development requires: - build-and-test
By setting the
FL_OUTPUT_DIR: env, that will tell Fastlane to output the XCode and Fastlane logs to that directory, so they get uploaded as artifacts for ease in troubleshooting.
Example application on GitHub
circleci-demo-ios GitHub repository for an example of how to configure code signing for iOS apps using Fastlane Match.
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