Threema Desktop Electron App

This follows the upstream documentation in the README 1. Note that this repository contains the actual web app as a submodule which we need to declare as a separate dependency.

Further, we use linux:deb in various build scripts, but outside of the actual package script, the :deb prefix doesn't do anything debian specific.

Packaging / Release Update Checklist

• Make sure that THREEMA_WEB_VERSION environment variable matches the version field in the package.json of the app/dependencies/threema-web submodule (as described in the README).

• Since the app uses Electron we use the official Flatpak Electron template. However, as described in detail here 2 we need to pre-fetch all dependencies, as node may not connect to the Internet within the buuild step. As the actual application and its package-lock.json is distributed over multiple files (and repos), we create the generated-sources.json file by cloning the repo with all submodules, and recursively (-r) collecting the info of all relevant dependency files using the flatpak-builder-tools 3:

  git clone --recurse-submodules https://github.com/threema-ch/threema-web-electron.git
  flatpak-node-generator npm -r --electron-node-headers \
          package-lock.json
  

  We also need to add the electron headers, otherwise the postinstall of electron will try to fetch additional dependencies in the build step as well.

  Note: Make sure you run this on a clean source directory, otherwise the generator may exclude some dependencies!

• Update the commit hash pointing to the new release

• Make sure the metainfo.xml is up to date, patch it, if necessary.

• Switch to a newer Freedesktop SDK if available.