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Build Documentation

This describes the conventions used for versioning, building, and signing apps published by InSeven.

Versions

Build Numbers

The iOS and macOS apps use auto-generated build numbers that attempt to encode the build timestamp, along with some details of the commit used. They follow the format:

YYmmddHHMMxxxxxxxx
  • YY – two-digit year
  • mm – month
  • dd – day
  • HH – hours (24h)
  • MM – minutes
  • xxxxxxxx – zero-padded integer representation of a 6-character commit SHA

These can be quickly decoded using the build-tools script:

% scripts/build-tools/build-tools parse-build-number 210727192100869578
2021-07-27 19:21:00 (UTC)
0d44ca

Certificates

Certificate Requirements

It seems like macOS app (Catalist apps at the very least) require a separate Mac Installer certificate to sign the app on export meaning that apps targeting both platforms require the following certificate types (names take from the developer portal):

  • Apple Distribution
  • Mac Installer Distribution

Specifically, I think macOS apps can be signed with the 'Apple Distribution' certificate but are submitted to the App Store by means of an installer which needs to be signed independently.

Inspecting Certificates

Unlike .cer files (which can be viewed using Quick Look), macOS doesn't make it particularly easy to work with .p12 PCKS 12 files; only Keychain Access is able to open these files and they will be automatically added to your keychain. If you want to double-check what's in a PCKS 12 file before adding it to your GitHub secrets, you can do this using openssl:

openssl pkcs12 -info -nodes -in build_certificate.p12

Updating Certificates

  1. Create new certificates.
  2. Re-generate profiles, download, and add to project--editing an expired profile will allow you to select a new certificate, save, and dowload.

Builds

Environment Variables and GitHub Secrets

Builds use base64 encoded PKCS 12 certificate and private key containers specified in the APPLE_DISTRIBUTION_CERTIFICATE_BASE64 and MACOS_DEVELOPER_INSTALLER_CERTIFICATE environment variables (with the password given in the APPLE_DISTRIBUTION_CERTIFICATE_PASSWORD and MACOS_DEVELOPER_INSTALLER_CERTIFICATE_PASSWORD environment variables respectively). This loosely follows the GitHub approach to managing certificates.

Keychain Access can be used to export your certificate and private key in the PKCS 12 format, and the base64 encoded version is generated as follows:

base64 -i "Apple Distribution InSeven Limited.p12" | pbcopy

This, along with the password used to protect the certificate, can then be added to the GitHub project secrets.

  • APPLE_API_KEY

  • APPLE_API_KEY_ID

  • APPLE_API_KEY_ISSUER_ID

  • APPLE_DISTRIBUTION_CERTIFICATE_BASE64

    Create this by base64 encoding the distribution certificate, as exported from Keychain Access:

    base64 -i "Apple Distribution InSeven Limited.p12" | pbcopy

  • APPLE_DISTRIBUTION_CERTIFICATE_PASSWORD

    The password used for the distribution certificate.

  • MACOS_DEVELOPER_INSTALLER_CERTIFICATE_BASE64

    This is known by a number of different names across Apple's tooling, including 'Mac Installer Certificate', and '3rd Party Mac Developer Installer'.

  • MACOS_DEVELOPER_INSTALLER_CERTIFICATE_PASSWORD

    The password used for the developer installer certificate.

Runners

macOS

Software

Builds expect the following software to be installed:

The GitHub Actions runner uses the path in '~/actions-runner/.path'. This needs to be updated to include Homebrew, asdf, and mise:

/Users/jbmorley/.local/share/mise/shims:/Users/jbmorley/.asdf/shims:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin

Environment Variables

GitHub Actions runners are expected to define a number of environment variables:

  • IOS_XCODE_PATH—path to the Xcode install to be used for iOS builds
  • MACOS_XCODE_PATH—path to the Xcode install to be used for macOS builds
  • DEFAULT_IPHONE_DESTINATION—details of the preferred iPhone simulator (e.g., 'iOS Simulator,name=iPhone 16 Pro')

These are set in '~/actions-runner/.env':

LANG=en_US.UTF-8
IOS_XCODE_PATH=/Applications/Xcode.app
MACOS_XCODE_PATH=/Applications/Xcode.app
DEFAULT_IPHONE_DESTINATION=platform=iOS Simulator,name=iPhone 16 Pro

Raspbian

Software

Builds expect the following software to be installed:

  • GitHub CLI; installed from the downloaded Debian package
  • jq; installed via Homebrew