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Using GitHub Actions + FastLane to deploy to TestFlight

These instructions allow you to build xDrip4iOS without having access to a Mac.

  • You can install xDrip4iOS on phones via TestFlight that are not connected to your computer
  • You can send builds and updates to those you care for
  • You can install xDrip4iOS on your phone using only the TestFlight app if a phone was lost or the app is accidentally deleted
  • You do not need to worry about specific Xcode/Mac versions for a given iOS

Automatic Builds

This new version of the browser build defaults to automatically updating and building a new version of xDrip4iOS according to this schedule:

  • automatically checks for updates weekly on Wednesdays and if updates are found, it will build a new version of the app
  • automatically builds once a month regardless of whether there are updates on the first of the month
  • with each scheduled run (weekly or monthly), a successful Build xDrip4iOS log appears - if the time is very short, it did not need to build - only the long actions (>20 minutes) built a new xDrip4iOS app

It also creates an alive branch, if you don't already have one. See Why do I have an alive branch?.

The Optional section provides instructions to modify the default behavior if desired.

This method for building without a Mac was ported from Loop. If you have used this method for Loop or one of the other DIY apps (Loop Caregiver, Loop Follow or iAPS), some of the steps can be re-used and the full set of instructions does not need to be repeated. This will be mentioned in relevant sections below.

Repeat Builders

  • to enable automatic build, your GH_PAT token must have workflow scope
  • if you previously configured your GH_PAT without that scope, see GH_PAT workflow permission

Introduction

The setup steps are somewhat involved, but nearly all are one time steps. Subsequent builds are trivial. Your app must be updated once every 90 days, but it's a simple click to make a new build and can be done from anywhere. The 90-day update is a TestFlight requirement, and with this version of xDrip4iOS, the build process (once you've successfully built once) is automated to update and build at least once a month.

There are more detailed instructions in LoopDocs for using GitHub for Browser Builds of Loop, including troubleshooting and build errors. Please refer to:

Note that installing with TestFlight, (in the US), requires the Apple ID account holder to be 13 years or older. For younger users, an adult must log into Media & Purchase on the child's phone to install Loop. More details on this can be found in LoopDocs.

Prerequisites

  • A GitHub account. The free level comes with plenty of storage and free compute time to build xDrip4iOS, multiple times a day, if you wanted to.
  • A paid Apple Developer account.
  • Some time. Set aside a couple of hours to perform the setup.

Save 6 Secrets

You require 6 Secrets (alphanumeric items) to use the GitHub build method and if you use the GitHub method to build more than xDrip4iOS, e.g., Loop Follow or other apps, you will use the same 6 Secrets for each app you build with this method. Each secret is indentified below by ALL_CAPITAL_LETTER_NAMES.

  • Four Secrets are from your Apple Account
  • Two Secrets are from your GitHub account
  • Be sure to save the 6 Secrets in a text file using a text editor
    • Do NOT use a smart editor, which might auto-correct and change case, because these Secrets are case sensitive

Generate App Store Connect API Key

This step is common for all GitHub Browser Builds; do this step only once. You will be saving 4 Secrets from your Apple Account in this step.

  1. Sign in to the Apple developer portal page.
  2. Copy the Team ID from the upper right of the screen. Record this as your TEAMID.
  3. Go to the App Store Connect interface, click the "Keys" tab, and create a new key with "Admin" access. Give it the name: "FastLane API Key".
  4. Record the issuer id; this will be used for FASTLANE_ISSUER_ID.
  5. Record the key id; this will be used for FASTLANE_KEY_ID.
  6. Download the API key itself, and open it in a text editor. The contents of this file will be used for FASTLANE_KEY. Copy the full text, including the "-----BEGIN PRIVATE KEY-----" and "-----END PRIVATE KEY-----" lines.

Create GitHub Personal Access Token

Log into your GitHub account to create a personal access token; this is one of two GitHub secrets needed for your build.

  1. Create a new personal access token:
    • Enter a name for your token, use "FastLane Access Token".
    • Change the Expiration selection to No expiration.
    • Select the workflow permission scope - this also selects repo scope.
    • Click "Generate token".
    • Copy the token and record it. It will be used below as GH_PAT.

Make up a Password

This is the second one of two GitHub secrets needed for your build.

The first time you build with the GitHub Browser Build method for any DIY app, you will make up a password and record it as MATCH_PASSWORD. Note, if you later lose MATCH_PASSWORD, you will need to delete and make a new Match-Secrets repository (next step).

Setup GitHub Match-Secrets Repository

The creation of the Match-Secrets repository is a common step for all GitHub Browser Builds; do this step only once. You must be logged into your GitHub account.

  1. Create a new empty repository titled Match-Secrets. It should be private.

Once created, you will not take any direct actions with this repository; it needs to be there for the GitHub to use as you progress through the steps.

Setup GitHub xdripswift Repository

  1. Fork https://github.com/JohanDegraeve/xdripswift into your account.
  2. In the forked xdripswift repo, go to Settings -> Secrets and variables -> Actions.
  3. For each of the following secrets, tap on "New repository secret", then add the name of the secret, along with the value you recorded for it:
    • TEAMID
    • FASTLANE_ISSUER_ID
    • FASTLANE_KEY_ID
    • FASTLANE_KEY
    • GH_PAT
    • MATCH_PASSWORD

Validate repository secrets

This step validates most of your six Secrets and provides error messages if it detects an issue with one or more.

  1. Click on the "Actions" tab of your xdripswift repository and enable workflows if needed
  2. On the left side, select "1. Validate Secrets".
  3. On the right side, click "Run Workflow", and tap the green Run workflow button.
  4. Wait, and within a minute or two you should see a green checkmark indicating the workflow succeeded.
  5. The workflow will check if the required secrets are added and that they are correctly formatted. If errors are detected, please check the run log for details.

Add Identifiers for xDrip4iOS App

  1. Click on the "Actions" tab of your xdripswift repository.
  2. On the left side, select "2. Add Identifiers".
  3. On the right side, click "Run Workflow", and tap the green Run workflow button.
  4. Wait, and within a minute or two you should see a green checkmark indicating the workflow succeeded.

Create App Group

If you have already built Loop via Xcode using this Apple ID, you can skip on to Add App Group to Bundle Identifiers.

  1. Go to Register an App Group on the apple developer site.
  2. For Description, use "Loop App Group".
  3. For Identifier, enter "group.com.TEAMID.loopkit.LoopGroup", subsituting your team id for TEAMID.
  4. Click "Continue" and then "Register".

Add App Group to Bundle Identifiers

Note 1 - If you previously built with Xcode, the Names listed below may be different, but the Identifiers will match. A table is provided below the steps to assist. The Add Identifier Action that you completed above generates 6 identifiers, but only 4 need to be modified as indicated in this step.

Note 2 - Depending on your build history, you may find some of the Identifiers are already configured - and you are just verifying the status; but in other cases, you will need to configure the Identifiers.

  1. Go to Certificates, Identifiers & Profiles on the apple developer site.
  2. For each of the following identifier names:
    • xdripswift
    • xdripswift xDrip4iOS-Widget
    • Watch App
  3. Click on the identifier's name.
  4. On the "App Groups" capabilies, click on the "Configure" button.
  5. Select the "Loop App Group" (yes, "Loop App Group" is correct)
  6. Click "Continue".
  7. Click "Save".
  8. Click "Confirm".
  9. Remember to do this for each of the identifiers above.

Create Xdrip4iOS App in App Store Connect

If you have created a Xdrip4iOS app in App Store Connect before, you can skip this section as well.

  1. Go to the apps list on App Store Connect and click the blue "plus" icon to create a New App.
    • Select "iOS".
    • Select a name: this will have to be unique, so you may have to try a few different names here, but it will not be the name you see on your phone, so it's not that important.
    • Select your primary language.
    • Choose the bundle ID that matches com.TEAMID.xdripswift, with TEAMID matching your team id.
    • SKU can be anything; e.g. "123".
    • Select "Full Access".
  2. Click Create

You do not need to fill out the next form. That is for submitting to the app store.

Create Building Certificates

  1. Go back to the "Actions" tab of your xdripswift repository in GitHub.
  2. On the left side, select "3. Create Certificates".
  3. On the right side, click "Run Workflow", and tap the green Run workflow button.
  4. Wait, and within a minute or two you should see a green checkmark indicating the workflow succeeded.

Build Xdrip4iOS!

  1. Click on the "Actions" tab of your xdripswift repository.
  2. On the left side, select "4. Build xDrip4iOS".
  3. On the right side, click "Run Workflow", and tap the green Run workflow button.
  4. You have some time now. Go enjoy a coffee. The build should take about 20-30 minutes.
  5. Your app should eventually appear on App Store Connect.
  6. For each phone/person you would like to support xDrip4iOS on:
    • Add them in Users and Access on App Store Connect.
    • Add them to your TestFlight Internal Testing group.

TestFlight and Deployment Details

Please refer to LoopDocs: Set Up Users and LoopDocs: Deploy

Automatic Build FAQs

Why do I have an alive branch?

If a GitHub repository has no activity (no commits are made) in 60 days, then GitHub disables the ability to use automated actions for that repository. We need to take action more frequently than that or the automated build process won't work.

The updated build_xdrip.yml file uses a special branch called alive and adds a dummy commit to the alive branch at regular intervals. This "trick" keeps the Actions enabled so the automated build works.

The branch alive is created automatically for you. Do not delete or rename it! Do not modify alive yourself; it is not used for building the app.

OPTIONAL

What if you don't want to allow automated updates of the repository or automatic builds?

You can affect the default behavior:

  1. GH_PAT workflow permission
  2. Modify scheduled building and synchronization

GH_PAT workflow permission

To enable the scheduled build and sync, the GH_PAT must hold the workflow permission scopes. This permission serves as the enabler for automatic and scheduled builds with browser build. To verify your token holds this permission, follow these steps.

  1. Go to your FastLane Access Token
  2. It should say repo, workflow next to the FastLane Access Token link
  3. If it does not, click on the link to open the token detail view
  4. Click to check the workflow box. You will see that the checked boxes for the repo scope become disabled (change color to dark gray and are not clickable)
  5. Scroll all the way down to and click the green Update token button
  6. Your token now holds both required permissions

If you choose not to have automatic building enabled, be sure the GH_PAT has repo scope or you won't be able to manually build.

Modify scheduled building and synchronization

You can modify the automation by creating and using some variables.

To configure the automated build more granularly involves creating up to two environment variables: SCHEDULED_BUILD and/or SCHEDULED_SYNC. See How to configure a variable.

Note that the weekly and monthly Build xDrip4iOS actions will continue, but the actions are modified if one or more of these variables is set to false. A successful Action Log will still appear, even if no automatic activity happens.

  • If you want to manually decide when to update your repository to the latest commit, but you want the monthly builds and keep-alive to continue: set SCHEDULED_SYNC to false and either do not create SCHEDULED_BUILD or set it to true
  • If you want to only build when an update has been found: set SCHEDULED_BUILD to false and either do not create SCHEDULED_SYNC or set it to true
    • Warning: if no updates to your default branch are detected within 90 days, your previous TestFlight build may expire requiring a manual build
SCHEDULED_SYNC SCHEDULED_BUILD Automatic Actions
true (or NA) true (or NA) keep-alive, weekly update check (auto update/build), monthly build with auto update
true (or NA) false keep-alive, weekly update check with auto update, only builds if update detected
false true (or NA) keep-alive, monthly build, no auto update
false false no automatic activity, no keep-alive

How to configure a variable

  1. Go to the "Settings" tab of your xdripswift repository.
  2. Click on Secrets and Variables.
  3. Click on Actions
  4. You will now see a page titled Actions secrets and variables. Click on the Variables tab
  5. To disable ONLY scheduled building, do the following:
    • Click on the green New repository variable button (upper right)
    • Type SCHEDULED_BUILD in the "Name" field
    • Type false in the "Value" field
    • Click the green Add variable button to save.
  6. To disable scheduled syncing, add a variable:
    • Click on the green New repository variable button (upper right)
      • Type SCHEDULED_SYNC in the "Name" field
    • Type false in the "Value" field
    • Click the green Add variable button to save

Your build will run on the following conditions:

  • Default behaviour:
    • Run weekly, every Wednesday at 08:00 UTC to check for changes; if there are changes, it will update your repository and build
    • Run monthly, every first of the month at 06:00 UTC, if there are changes, it will update your repository; regardless of changes, it will build
    • Each time the action runs, it makes a keep-alive commit to the alive branch if necessary
  • If you disable any automation (both variables set to false), no updates, keep-alive or building happens when Build xDrip4iOS runs
  • If you disabled just scheduled synchronization (SCHEDULED_SYNC set tofalse), it will only run once a month, on the first of the month, no update will happen; keep-alive will run
  • If you disabled just scheduled build (SCHEDULED_BUILD set tofalse), it will run once weekly, every Wednesday, to check for changes; if there are changes, it will update and build; keep-alive will run