name: fastlane description: > iOS and Android app deployment automation with Fastlane. Use when building, signing, and distributing apps to TestFlight, App Store, or Google Play. Covers Match code signing, CI/CD keychain setup, and Tauri integration. Triggers on Fastfile, Appfile, Matchfile, fastlane commands.

Fastlane Deployment Skill

Automate iOS and Android app building, code signing, and distribution.

When to Apply

Reference this skill when:

• Setting up Fastlane for a new project
• Configuring code signing with Match
• Building lanes for TestFlight or App Store distribution
• Setting up Android Play Store deployment
• Debugging code signing or build failures
• Configuring CI/CD pipelines for mobile apps
• Integrating Fastlane with Tauri v2 projects

Quick Start

Minimal Fastfile Structure

default_platform(:ios)

platform :ios do
  desc "Build and upload to TestFlight"
  lane :beta do
    match(type: "appstore", readonly: true)
    build_app(scheme: "MyApp")
    upload_to_testflight
  end
end

platform :android do
  desc "Build and upload to Play Store beta"
  lane :beta do
    gradle(task: "bundle", build_type: "Release")
    upload_to_play_store(track: "beta")
  end
end

Tool Aliases

Fastlane provides shorter aliases for common actions:

iOS Workflows

TestFlight Deployment

lane :beta do
  # Sync code signing
  match(type: "appstore", readonly: true)

  # Increment build number
  increment_build_number(
    build_number: Time.now.utc.strftime("%y%m%d%H%M")
  )

  # Build the app
  build_app(
    scheme: "MyApp",
    export_method: "app-store",
    output_directory: "./build"
  )

  # Upload to TestFlight
  upload_to_testflight(
    skip_waiting_for_build_processing: true,
    uses_non_exempt_encryption: false
  )
end

App Store Release

lane :release do
  match(type: "appstore", readonly: true)

  build_app(
    scheme: "MyApp",
    export_method: "app-store"
  )

  upload_to_app_store(
    skip_screenshots: true,
    skip_metadata: true,
    submit_for_review: false
  )
end

App Store Connect API Key

def api_key
  app_store_connect_api_key(
    key_id: ENV['APP_STORE_CONNECT_API_KEY_KEY_ID'],
    issuer_id: ENV['APP_STORE_CONNECT_API_KEY_ISSUER_ID'],
    key_content: ENV['APP_STORE_CONNECT_API_KEY_KEY'],
    is_key_content_base64: true
  )
end

lane :beta do
  upload_to_testflight(api_key: api_key)
end

Android Workflows

Play Store Beta

platform :android do
  lane :beta do
    gradle(
      task: "bundle",
      build_type: "Release",
      project_dir: "./android"
    )

    upload_to_play_store(
      track: "beta",
      aab: "./android/app/build/outputs/bundle/release/app-release.aab",
      skip_upload_metadata: true,
      skip_upload_images: true
    )
  end
end

Play Store Production

lane :release do
  gradle(task: "bundle", build_type: "Release")

  upload_to_play_store(
    track: "production",
    aab: "./android/app/build/outputs/bundle/release/app-release.aab"
  )
end

Code Signing with Match

Initial Setup

# Initialize Match configuration
fastlane match init

# Generate certificates (run once per team)
fastlane match appstore
fastlane match development

Matchfile Configuration

# fastlane/Matchfile
git_url("git@github.com:your-org/certificates.git")
storage_mode("git")
type("appstore")
app_identifier("com.example.app")
team_id("TEAM_ID")

S3/MinIO Storage (Alternative to Git)

# Matchfile for S3-compatible storage
storage_mode("s3")
s3_region("us-east-1")
s3_bucket("certificates")
s3_access_key(ENV['AWS_ACCESS_KEY_ID'])
s3_secret_access_key(ENV['AWS_SECRET_ACCESS_KEY'])

# For MinIO, set endpoint
# ENV['AWS_ENDPOINT_URL'] = "https://minio.example.com"

Using Match in Lanes

lane :beta do
  match(
    type: "appstore",
    readonly: true,  # Don't create new certs
    keychain_name: ENV['CI'] ? "fastlane_ci" : nil,
    keychain_password: ENV['CI'] ? "fastlane_ci_password" : nil
  )
end

CI/CD Integration

Keychain Setup for CI

CI_KEYCHAIN_NAME = "fastlane_ci"
CI_KEYCHAIN_PASSWORD = "fastlane_ci_password"

def setup_ci_keychain
  if ENV['CI']
    create_keychain(
      name: CI_KEYCHAIN_NAME,
      password: CI_KEYCHAIN_PASSWORD,
      default_keychain: true,
      unlock: true,
      timeout: 3600,
      lock_when_sleeps: false,
      add_to_search_list: true
    )
  end
end

def cleanup_ci_keychain
  if ENV['CI']
    delete_keychain(name: CI_KEYCHAIN_NAME)
  end
end

lane :beta do
  setup_ci_keychain
  match(
    type: "appstore",
    keychain_name: CI_KEYCHAIN_NAME,
    keychain_password: CI_KEYCHAIN_PASSWORD
  )
  # ... build and upload
  cleanup_ci_keychain
end

GitHub Actions Example

# .github/workflows/ios.yml
name: iOS Build
on: [push]

jobs:
  build:
    runs-on: macos-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Fastlane
        run: brew install fastlane

      - name: Build and Deploy
        env:
          MATCH_PASSWORD: ${{ secrets.MATCH_PASSWORD }}
          MATCH_GIT_URL: ${{ secrets.MATCH_GIT_URL }}
          APP_STORE_CONNECT_API_KEY_KEY_ID: ${{ secrets.ASC_KEY_ID }}
          APP_STORE_CONNECT_API_KEY_ISSUER_ID: ${{ secrets.ASC_ISSUER_ID }}
          APP_STORE_CONNECT_API_KEY_KEY: ${{ secrets.ASC_KEY_CONTENT }}
          CI: true
        run: fastlane ios beta

Environment Variables

iOS (App Store Connect)

Android (Google Play)

Encoding API Keys

# Encode .p8 file to base64
base64 -i AuthKey_XXXXXXXXXX.p8 | tr -d '\n'

# Encode Google Play JSON
base64 -i play-store-key.json | tr -d '\n'

App Store Requirements

Metadata Character Limits

Screenshot Requirements (2024)

Known Issues Prevention

Tauri Integration

Version from Cargo.toml

ROOT_DIR = File.expand_path("..", __dir__)

def get_app_version
  cargo_toml = File.read("#{ROOT_DIR}/src-tauri/Cargo.toml")
  if cargo_toml =~ /^version\s*=\s*"([^"]+)"/
    $1
  else
    "1.0.0"
  end
end

def get_next_build_number
  Time.now.utc.strftime("%y%m%d%H%M").to_i
end

Update tauri.conf.json

def update_tauri_config_version
  app_version = get_app_version
  build_number = get_next_build_number

  tauri_conf_path = "#{ROOT_DIR}/src-tauri/tauri.conf.json"
  tauri_conf = JSON.parse(File.read(tauri_conf_path))
  tauri_conf["version"] = app_version
  tauri_conf["bundle"] ||= {}
  tauri_conf["bundle"]["iOS"] ||= {}
  tauri_conf["bundle"]["iOS"]["bundleVersion"] = build_number.to_s

  File.write(tauri_conf_path, JSON.pretty_generate(tauri_conf))
end

Fix Tauri project.yml (Duplicate libapp.a)

def fix_tauri_project_yml
  project_yml_path = "#{ROOT_DIR}/src-tauri/gen/apple/project.yml"
  return unless File.exist?(project_yml_path)

  content = File.read(project_yml_path)

  # Remove "- path: Externals" to prevent duplicate libapp.a
  if content.include?("- path: Externals")
    content.gsub!(/^\s*- path: Externals\n/, "")
    File.write(project_yml_path, content)
    sh("cd #{ROOT_DIR}/src-tauri/gen/apple && xcodegen generate")
  end
end

Tauri iOS Build Lane

lane :beta do
  match(type: "appstore", readonly: true)

  update_tauri_config_version
  fix_tauri_project_yml

  # Configure signing
  update_code_signing_settings(
    use_automatic_signing: false,
    path: "#{ROOT_DIR}/src-tauri/gen/apple/MyApp.xcodeproj",
    team_id: TEAM_ID,
    bundle_identifier: APP_IDENTIFIER,
    profile_name: "match AppStore #{APP_IDENTIFIER}",
    code_sign_identity: "Apple Distribution"
  )

  # Build with Tauri
  sh("cd #{ROOT_DIR}/src-tauri && npx tauri ios build --export-method app-store-connect")

  upload_to_testflight(
    ipa: "#{ROOT_DIR}/src-tauri/gen/apple/build/arm64/MyApp.ipa",
    skip_waiting_for_build_processing: true
  )
end

Tauri Android Build Lane

platform :android do
  lane :beta do
    ENV['ANDROID_HOME'] = "/opt/homebrew/share/android-commandlinetools"
    ENV['ANDROID_NDK_HOME'] = "#{ENV['ANDROID_HOME']}/ndk/28.2.13676358"

    # Update version in tauri.conf.json
    app_version = get_app_version
    build_number = get_next_build_number

    tauri_conf_path = "#{ROOT_DIR}/src-tauri/tauri.conf.json"
    tauri_conf = JSON.parse(File.read(tauri_conf_path))
    tauri_conf["version"] = app_version
    tauri_conf["bundle"]["android"] ||= {}
    tauri_conf["bundle"]["android"]["versionCode"] = build_number
    File.write(tauri_conf_path, JSON.pretty_generate(tauri_conf))

    # Build with Tauri
    sh("cd #{ROOT_DIR}/src-tauri && npx tauri android build")

    upload_to_play_store(
      track: "beta",
      aab: "#{ROOT_DIR}/src-tauri/gen/android/app/build/outputs/bundle/release/app-release.aab"
    )
  end
end

Essential Commands

# Initialize Fastlane
fastlane init

# List available actions
fastlane actions

# Run a specific lane
fastlane ios beta
fastlane android release

# Debug with verbose output
fastlane ios beta --verbose

# Run Match commands
fastlane match appstore
fastlane match development
fastlane match nuke distribution  # Reset all distribution certs

Sources

• Fastlane Documentation
• App Store Connect API
• Google Play Developer API
• Tauri v2 Mobile Guide