Merge pull request #814 from omacom/slack-desktop-aarch64
Add slack-desktop for aarch64 on a native Electron runtime
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{
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"source": "local",
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"upstream": {
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"watch": {
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"json": "https://slack.com/api/desktop.latestRelease?arch=x64&variant=deb",
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"path": "version"
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}
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}
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}
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# Maintainer: Ryan Hughes <ryan@omarchy.org>
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pkgname=slack-desktop
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pkgver=4.52.171
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pkgrel=1
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# Slack publishes Linux builds for x86_64 only. Its application code runs
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# unchanged on the AArch64 build of the Electron release it ships with; see
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# README.md for the native modules that are replaced or dropped.
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_electronver=44.4.5
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pkgdesc='Slack Desktop for Linux on a native AArch64 Electron runtime'
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arch=('aarch64')
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url='https://slack.com/downloads'
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license=('custom')
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depends=(
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'alsa-lib'
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'at-spi2-core'
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'cairo'
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'dbus'
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'expat'
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'fontconfig'
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'gcc-libs'
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'glib2'
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'glibc'
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'gtk3'
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'libcups'
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'libnotify'
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'libsecret'
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'libx11'
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'libxcb'
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'libxcomposite'
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'libxdamage'
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'libxext'
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'libxfixes'
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'libxkbcommon'
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'libxrandr'
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'mesa'
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'nspr'
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'nss'
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'pango'
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'systemd-libs'
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'xdg-utils'
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)
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optdepends=(
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'libappindicator-gtk3: Systray indicator support'
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'org.freedesktop.secrets: Keyring password store support'
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)
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makedepends=('asar')
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options=('!debug' '!strip')
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source=(
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"slack-desktop-${pkgver}-amd64.deb::https://downloads.slack-edge.com/desktop-releases/linux/x64/${pkgver}/slack-desktop-${pkgver}-amd64.deb"
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"electron-v${_electronver}-linux-arm64.zip::https://github.com/electron/electron/releases/download/v${_electronver}/electron-v${_electronver}-linux-arm64.zip"
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'slack.desktop'
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'slack-desktop-utils.js'
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'file-handler-info.js'
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'electron-native-auth.js'
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)
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noextract=(
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"slack-desktop-${pkgver}-amd64.deb"
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"electron-v${_electronver}-linux-arm64.zip"
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)
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sha256sums=('c6199816e6d842289869a9e84a05042af6e0de68959df7a15e7273873b86dc36'
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'3bf0acab49c4ea3c9283cdb86bf3dd7204bd52a6fba6c8ae51101bdba2adae0e'
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'e438e78265f3e566990300946afb4ea5d09bcd8c426738ab8f486ae9ddb86c0f'
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'6de40409af5a04605c3287cb3c661132eb55a4f636f7cd9bbfd456f4adf41971'
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'a2a8fd45daa4f493ad4487da9f01477233feecfef360ed366bfb0a58f804890a'
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'9cd53c84fdc407c83f2ca6e9485916296f3712b2742dcc0acf22fda5195ead50')
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# x86_64 addons in Slack's app that can never load on AArch64. The three that
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# Slack requires on Linux are replaced by the JavaScript files above; the rest
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# are Windows/macOS helpers or degrade on failure (native-keymap). Any other
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# foreign binary fails the build so a new native module gets reviewed.
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_x86_addons=(
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'@tinyspeck/slack-desktop-utils/lib/binding/napi-v8/slackdesktoputils.node'
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'file-handler-info/build/Release/file_handler_info.node'
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'electron-native-auth/build/Release/electron_native_auth.node'
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'@tinyspeck/native-keymap/build/Release/keymapping.node'
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'cf-prefs/build/Release/cf-prefs.node'
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'macos-notification-state/build/Release/notificationstate.node'
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'registry-js/build/Release/registry.node'
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'windows-focus-assist/build/Release/focusassist.node'
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)
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prepare() {
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rm -rf slack electron app
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mkdir slack electron
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bsdtar -O -xf "slack-desktop-${pkgver}-amd64.deb" 'data.tar.*' | bsdtar -C slack -xf -
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bsdtar -C electron -xf "electron-v${_electronver}-linux-arm64.zip"
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local slack_electron
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slack_electron=$(<slack/usr/lib/slack/version)
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if [[ $slack_electron != "$_electronver" ]]; then
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error "Slack $pkgver ships Electron $slack_electron, but _electronver is $_electronver."
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plain "Set _electronver=$slack_electron and update its checksum."
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return 1
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fi
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# Electron loads resources/app ahead of app.asar, so the extracted tree can
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# carry the replacement modules without repacking the archive.
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asar extract slack/usr/lib/slack/resources/app.asar app
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}
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package() {
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local lib="$pkgdir/usr/lib/slack"
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local app="$lib/resources/app"
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install -d "$lib"
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cp -a --no-preserve=ownership electron/. "$lib/"
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mv "$lib/electron" "$lib/slack"
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rm -f "$lib/resources/default_app.asar" "$lib/LICENSE"
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find slack/usr/lib/slack/resources -maxdepth 1 -type f ! -name app.asar \
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-exec cp --no-preserve=ownership -t "$lib/resources" {} +
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cp -a --no-preserve=ownership app "$app"
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local shim target
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for shim in \
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'slack-desktop-utils.js:@tinyspeck/slack-desktop-utils/lib/index.js' \
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'file-handler-info.js:file-handler-info/index.js' \
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'electron-native-auth.js:electron-native-auth/index.js'; do
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target="$app/node_modules/${shim#*:}"
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if [[ ! -f $target ]]; then
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error "Slack $pkgver no longer ships ${shim#*:}; review the replacement modules."
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return 1
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fi
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install -m644 "$srcdir/${shim%%:*}" "$target"
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done
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local addon
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for addon in "${_x86_addons[@]}"; do
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rm -f "$app/node_modules/$addon"
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done
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local file machine
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while IFS= read -r -d '' file; do
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machine=$(readelf -h "$file" 2>/dev/null |
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sed -n 's/^[[:space:]]*Machine:[[:space:]]*//p')
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case "$machine" in
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'' | AArch64) ;;
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*) error "Unexpected ${machine} binary: ${file#"$pkgdir"}"; return 1 ;;
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esac
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done < <(find "$lib" -type f -print0)
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find "$lib" -type d -exec chmod 755 {} +
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find "$lib" -type f -exec chmod 644 {} +
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# Chromium sandboxes through unprivileged user namespaces, which Arch-family
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# kernels allow; a setuid-root helper is not needed.
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chmod 755 "$lib/slack" "$lib/chrome_crashpad_handler" "$lib/chrome-sandbox"
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install -d "$pkgdir/usr/bin"
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ln -s /usr/lib/slack/slack "$pkgdir/usr/bin/slack"
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install -Dm644 slack.desktop "$pkgdir/usr/share/applications/slack.desktop"
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install -Dm644 slack/usr/share/pixmaps/slack.png \
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"$pkgdir/usr/share/icons/hicolor/512x512/apps/slack.png"
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local licenses="$pkgdir/usr/share/licenses/$pkgname"
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install -Dm644 slack/usr/lib/slack/LICENSE "$licenses/LICENSE"
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install -Dm644 slack/usr/share/doc/slack-desktop/OPEN_SOURCE_LICENSE_ATTRIBUTIONS \
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"$licenses/OPEN_SOURCE_LICENSE_ATTRIBUTIONS"
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install -Dm644 electron/LICENSE "$licenses/LICENSE.electron.txt"
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install -Dm644 electron/LICENSES.chromium.html "$licenses/LICENSES.chromium.html"
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}
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@@ -0,0 +1,22 @@
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# Slack on ARM
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Slack publishes Linux builds for x86_64 only, and the AUR `slack-desktop` recipe repackages that `.deb`. This package runs the same application code on the AArch64 build of the Electron release Slack ships with, so `yay -S slack-desktop` on an ARM Omarchy install resolves to a working package.
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## Electron version
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`_electronver` must equal the Electron version inside Slack's `.deb` (`usr/lib/slack/version`). `prepare()` refuses to build when they differ and prints the version to set. A Slack release that moves to a new Electron therefore fails its sync PR build until `_electronver` and the Electron checksum are updated; the upstream watch only tracks Slack's version.
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## Native modules
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Slack's app carries eight x86_64 Node addons. None can load on AArch64, so they are removed, and the build fails on any other foreign binary so a new native module is reviewed before it ships.
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Three are required while Slack boots on Linux and are replaced by JavaScript:
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- `file-handler-info` and `electron-native-auth` are MIT-licensed and their Linux builds compile no-op implementations (`impl_none.cc`, `addon_none.cc`). The replacements return the same results.
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- `@tinyspeck/slack-desktop-utils` is closed source. Its replacement throws `Method not implemented` from every native call, which is the error Slack's own wrapper uses for methods a platform lacks. Slack catches it, so these Linux features are unavailable: double-press and combo global shortcuts, the huddle screen-share border overlay, audio device detail lookups, clipboard set-and-paste, and haptics.
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`@tinyspeck/native-keymap` already catches a missing addon and returns defaults, so keyboard layout detection reports `unknown`. The other four addons are Windows/macOS helpers that Slack does not use on Linux.
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## Validation
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Installed and used on an aarch64 Omarchy machine (N1x). Features listed above as unavailable were not expected to work and were not checked.
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// Linux builds of electron-native-auth (github.com/clavin/electron-native-auth)
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// compile src/addon_none.cc: native auth sessions are unavailable and
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// constructing a request throws. This is the same facade in JavaScript.
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class AuthRequest {
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static isAvailable() {
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return false;
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}
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constructor() {
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throw new Error('this function is not implemented for this platform');
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}
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}
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exports.AuthRequest = AuthRequest;
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// Linux builds of file-handler-info (github.com/clavin/node-file-handler-info)
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// compile src/impl_none.cc, which finds no handler. This is the same result
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// without an architecture-specific addon.
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exports.getHandlerInfo = (filePath) => {
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if (typeof filePath !== 'string') {
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throw new TypeError('Expected 1st argument to be string');
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}
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return { handlerPath: null, friendlyName: null };
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};
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// Stand-in for Slack's closed-source native helpers, which ship no aarch64
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// build. Slack's main bundle requires this module while booting, so a missing
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// addon stops the window from ever opening. Every native call throws the same
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// error the vendor wrapper uses for methods a platform lacks, and Slack's call
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// sites already catch it and fall back.
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const unavailable = () => {
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throw new Error('Method not implemented');
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};
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const namespace = new Proxy(
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{},
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{
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get: (_, key) =>
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typeof key === 'symbol' || key === 'then' ? undefined : unavailable,
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},
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);
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const constants = {
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AppRestartFlags: { NoCrash: 1, NoHang: 2, NoPatch: 4, NoReboot: 8 },
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WindowsNotifierState: {
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NotificationPlatformUnavailable: -2,
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Error: -1,
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Enabled: 0,
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DisabledForApplication: 1,
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DisabledForUser: 2,
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DisabledByGroupPolicy: 3,
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DisabledByManifest: 4,
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},
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StartupTaskState: {
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Error: -1,
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Disabled: 0,
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DisabledByUser: 1,
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Enabled: 2,
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DisabledByPolicy: 3,
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EnabledByPolicy: 4,
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},
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ActivationType: { Error: -1, StartupTask: 1020 },
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};
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module.exports = new Proxy(constants, {
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get: (target, key) => {
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if (key in target) return target[key];
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if (
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typeof key === 'symbol' ||
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key === '__esModule' ||
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key === 'default' ||
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key === 'then'
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) {
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return undefined;
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}
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return namespace;
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},
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});
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@@ -0,0 +1,11 @@
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[Desktop Entry]
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Name=Slack
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StartupWMClass=Slack
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Comment=Slack Desktop
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GenericName=Slack Client for Linux
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Exec=/usr/bin/slack %U
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Icon=slack
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Type=Application
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StartupNotify=true
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Categories=GNOME;GTK;Network;InstantMessaging;
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MimeType=x-scheme-handler/slack;
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