feat: build from source; enable arm64

snap/gui/signal-desktop.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Name=Signal
+Exec=/opt/Signal/signal-desktop --no-sandbox %U
+Terminal=false
+Type=Application
+Icon=signal-desktop
+StartupWMClass=Signal
+Comment=Private messaging from your desktop
+MimeType=x-scheme-handler/sgnl;x-scheme-handler/signalcaptcha;
+Categories=Network;InstantMessaging;Chat;

snap/snapcraft.yaml

@@ -35,12 +35,68 @@ confinement: strict
 
 architectures:
   - build-on: amd64
+  - build-on: arm64
 compression: lzo
 
 parts:
   signal-desktop:
     plugin: dump
-    source: https://updates.signal.org/desktop/apt/pool/s/signal-desktop/signal-desktop_$SNAPCRAFT_PROJECT_VERSION_amd64.deb
+    source: https://github.com/signalapp/Signal-Desktop
+    source-type: git
+    source-tag: v$SNAPCRAFT_PROJECT_VERSION
+    build-packages:
+      - curl
+      - git-lfs
+      - jq
+      - python3
+    build-environment:
+      - SIGNAL_ENV: "production"
+      - USE_SYSTEM_FPM: "true"
+    override-build: |
+      git lfs install
+
+      # Install the version of NodeJS used by the upstream project
+      git clone https://github.com/asdf-vm/asdf.git ./.asdf --branch v0.13.1
+      . "./.asdf/asdf.sh"
+      asdf plugin add nodejs
+      asdf install nodejs 18.15.0
+      asdf global nodejs 18.15.0
+
+      # Install Yarn globally
+      npm install -g yarn 
+      # Make sure that node-gyp uses the right Python
+      yarn config set python /usr/bin/python3
+
+      # Disable yarn auto clean functionality
+      rm .yarnclean
+
+      # Don't try to build a deb (this fails on arm64)
+      cp package.json package.json.tmp
+      cat package.json.tmp | jq '.build.linux.target = ["dir"]' > package.json
+
+      # Install the node dependencies.
+      yarn install --frozen-lockfile
+
+      # This is the equivalent of 'yarn generate'. The upstream package.json
+      # uses npm-run-all to run multiple things, which has a bug that prevents
+      # this from succeeding in the snapcraft build env, so this just breaks
+      # that apart into its component parts.
+      yarn build-protobuf
+      yarn build:esbuild
+      yarn sass 
+      yarn get-expire-time
+      yarn copy-components
+
+      # This is the equivalent of 'yarn build-linux' which also runs 'yarn generate'
+      # which is broken (as described above).
+      yarn build:esbuild:prod
+      yarn build:release --publish=never
+      yarn build:electron --config.directories.output=release
+
+      # Stage the built release. Directory is called 'linux-unpacked' for amd64,
+      # and 'linux-arm64-unpacked' for arm64.
+      mkdir -p ${CRAFT_PART_INSTALL}/opt
+      mv release/linux-*unpacked ${CRAFT_PART_INSTALL}/opt/Signal
     stage-packages:
       - libxss1
       - libnspr4
@@ -94,7 +150,6 @@ parts:
 apps:
   signal-desktop:
     extensions: [gnome]
-    desktop: usr/share/applications/signal-desktop.desktop
     command: opt/Signal/signal-desktop --use-tray-icon --no-sandbox
     plugs:
       - browser-support