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CI/CD Conference
2021
何故、一般人がCOCOAに貢
献しようと思ったのか
一般人がCOCOA に貢献までの流れ
1. COVID-19Radar 時代に少しだけ関わってた
2. NewsでCOCOAの開発がGitHubで続いている事を知る
3. モチベーションに突き動かされて、いつの間にかPullRequest
を出していた
1. 本業終了後PR出すのに熱中して大体8時間経過してた😇
2. COVID-19の状況下でフルフレックス、WFHになり、時間を効率的
に使えたからContributionできた!
COCOAにContributionするモチベーション
• 日本が早くCOVID-19を克服して海外旅行再開したい!
• 国主導で日本中の人が使う、影響力の高いソフトウェアの開発
に関わりたい!
• 自分の技術的バックグラウンドでも貢献できそう!
• 株式会社メルカリでのインターン時代にAndroidアプリのCI/CDや開
発効率向上する業務をしてた(現在はAndroidアプリの機能開発してる)
• 学生時代にXamarinを使い開発したり勉強会を開催してた
何故、CIの改善に注力しようと思ったのか
• 業務で行っているAndroidアプリ開発の経験はそこまで流用で
きなさそう
• Visual Studioのライセンスを持っていない
• Xamarin部分での開発に関わるのは難しそう
• CIに注力してる人が既存でおらず、改善の余地がありそう
• 今後の開発に永続的に貢献できそう
当時のCOCOAのCIの状況
• iOS/Android向けのビルド等のワークフローが存在してた
• 各プラットフォーム、各バリアント向けのWorkflowがコピペ
でそれぞれ存在してた
• 並列化されておらず逐次実行していた
改善できそうなところ
• コピペで複数ターゲット向けWorkflowが存在しているため複
雑・可読性の低い設定ファイルになってる
• 逐次実行の代わりに並行実行して開発者の待機時間減らしたい
• CIの設定ファイルまで手が回っておらずそもそも微力でも貢献
になりそう
Github Actions の Job記述の効率化したい
• Github Actionsのmatrix構文を活用
• Jobの一部を書き換えて複数目的に流用できる
• この例では Debug, Debug_Mock, Release向けにビルド
https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix
OSSでの同一OS Runner数の制限対策
• Github Actionsでは、macOSのRunnerで同時実行できるJob
の数の制限があります
https://docs.github.com/en/actions/reference/usage-limits-billing-and-administration
OSSでの同一OS Runner数の制限対策
• COCOA Repository での開発を予想してみてる
• 複数人がContribution
• 日本全国から注目されていることもありスケールするかも…
• 同一Runner数の制限がボトルネックになるかも…
OSSでの同一OS Runner数の制限対策
• macOS以外のRunnerでも実行するようにして制限を受けづら
いWorkflowにしたい
• CIする上でのビルド対象由来のOSの制限
• iOS向けアプリ
• macOS上で実行する必要がある
• Android向けアプリ
• macOS, Windows, Linuxでもビルドできる
• Unit Test
• macOS, Windows, Linuxでもビルドできる
https://docs.github.com/en/actions/reference/usage-limits-billing-and-administration
OSSでの同一OS Runner数の制限対策
• iOS 向け Job
• macOS Runner で動作
• Android 向け Job
• Windows Runner で動作
• Unit Test
• Linux(Ubuntu) Runner で動作
https://docs.github.com/en/actions/reference/usage-limits-billing-and-administration
複数OS Runnerと Build System周りの理解
• Xamarin 製アプリのビルドにはMicrosoft製のビルドシステム
を利用する必要がある
• iOS/Androidで使う xcodebuild/Gradleを使うのは厳しそう
• .NET Core
• クロスプラットフォームで動くC#等のアプリケーション環境
• MS Build
• Windowsで動くC#等のアプリケーション環境
• Mono をJob実行時にインストールしmacOS上で使えるようにした
https://docs.github.com/en/actions/reference/usage-limits-billing-and-administration
各 OS Runner と使ったBuild System
• iOS 向けアプリ
• macOS Runner
• MSBuild を利用しビルド
• Android 向けアプリ
• Windows Runner
• MSBuild を利用しビルド
• Unit Test
• Ubuntu Runner
• .NET Core を利用しビルド
Xamarin と Build System 周りでつまづいた点
• .NET Core を使い Xamarin をビルドできない
• .NET 6 とリリースを待つのは厳しいため、mono を入れる必要がある
• 数年前から存在するビルドエラーのissueが未だ放置されてる
• モバイルアプリの開発者がC#周りのBuild Systemをキャッチ
アップしようとすると、環境の違いが多すぎて苦痛だった
• M1 Mac mini にてVisual Studio for mac でのコーディング断
念したほど重かった…
• xabuild(MSBuildのXamarin.Android向けラッパー)が2018年以
降メンテナンスされていなかった

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接触確認アプリ「COCOA」 OSSモバイルアプリのCI整備の難しさ part 2