signal-desktop: Adds support for `aarch64-linux`

This adds support for `signal-desktop` on `aarch64-linux`. This is
achieved by leveraging a community deb package that builds it for
`aarch64`. A future version may switches to a full custom build of the
package, so that we don't need to use any debs at all.

2 files changed, 27 insertions, 11 deletions

diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
index c545ac79a242b..c01f260406d4b 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
@@ -1,12 +1,17 @@
-{ callPackage }: builtins.mapAttrs (pname: attrs: callPackage ./generic.nix (attrs // { inherit pname; })) {
-  signal-desktop = {
+{ callPackage, stdenv }: builtins.mapAttrs (pname: attrs: callPackage ./generic.nix (attrs // { inherit pname; })) {
+  signal-desktop = rec {
     dir = "Signal";
     version = "6.40.0";
+    version-aarch64 = "6.40.0";
+    url = "https://updates.signal.org/desktop/apt/pool/s/signal-desktop/signal-desktop_${version}_amd64.deb";
+    url-aarch64 = "https://github.com/0mniteck/Signal-Desktop-Mobian/raw/${version-aarch64}/builds/release/signal-desktop_${version-aarch64}_arm64.deb";
     hash = "sha256-vyXHlycPSyEyv938IKzGM6pdERHHerx2CLY/U+WMrH4=";
+    hash-aarch64 = "sha256-3Pi0c+CGcJR1M4ll51m+B5PmGIcIjjlc0qa9b8rkMeU=";
   };
-  signal-desktop-beta = {
+  signal-desktop-beta = rec {
     dir = "Signal Beta";
     version = "6.40.0-beta.2";
     hash = "sha256-pfedkxbZ25DFgz+/N7ZEb9LwKrHuoMM+Zi+Tc21QPsg=";
+    url = "https://updates.signal.org/desktop/apt/pool/s/signal-desktop-beta/signal-desktop-beta_${version}_amd64.deb";
   };
 }
diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/generic.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/generic.nix
index 1d75bd542d6c0..c3e14775cb16a 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/generic.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/generic.nix
@@ -1,7 +1,11 @@
 { pname
 , dir
 , version
+, version-aarch64 ? ""
 , hash
+, hash-aarch64 ? ""
+, url
+, url-aarch64 ? ""
 , stdenv
 , lib
 , fetchurl
@@ -51,8 +55,15 @@
 , wayland
 }:
 
-stdenv.mkDerivation rec {
-  inherit pname version; # Please backport all updates to the stable channel.
+let
+  inherit (stdenv) targetPlatform;
+  ARCH = if targetPlatform.isAarch64 then "arm64" else "x64";
+  final-version = if targetPlatform.isAarch64 then version-aarch64 else version;
+in stdenv.mkDerivation rec {
+  inherit pname;
+  version = final-version;
+
+  # Please backport all updates to the stable channel.
   # All releases have a limited lifetime and "expire" 90 days after the release.
   # When releases "expire" the application becomes unusable until an update is
   # applied. The expiration date for the current release can be extracted with:
@@ -61,8 +72,8 @@ stdenv.mkDerivation rec {
   # few additional steps and might not be the best idea.)
 
   src = fetchurl {
-    url = "https://updates.signal.org/desktop/apt/pool/s/${pname}/${pname}_${version}_amd64.deb";
-    inherit hash;
+    url = if targetPlatform.isAarch64 then url-aarch64 else url;
+    hash = if targetPlatform.isAarch64 then hash-aarch64 else hash;
   };
 
   nativeBuildInputs = [
@@ -163,7 +174,7 @@ stdenv.mkDerivation rec {
       ${if pname == "signal-desktop" then "--replace \"bin/signal-desktop\" \"bin/signal-desktop --use-tray-icon\"" else ""}
 
     autoPatchelf --no-recurse -- "$out/lib/${dir}/"
-    patchelf --add-needed ${libpulseaudio}/lib/libpulse.so "$out/lib/${dir}/resources/app.asar.unpacked/node_modules/@signalapp/ringrtc/build/linux/libringrtc-x64.node"
+    patchelf --add-needed ${libpulseaudio}/lib/libpulse.so "$out/lib/${dir}/resources/app.asar.unpacked/node_modules/@signalapp/ringrtc/build/linux/libringrtc-${ARCH}.node"
   '';
 
   # Tests if the application launches and waits for "Link your phone to Signal Desktop":
@@ -176,11 +187,11 @@ stdenv.mkDerivation rec {
       "Signal Android" or "Signal iOS" app.
     '';
     homepage = "https://signal.org/";
-    changelog = "https://github.com/signalapp/Signal-Desktop/releases/tag/v${version}";
+    changelog = "https://github.com/signalapp/Signal-Desktop/releases/tag/v${final-version}";
     license = lib.licenses.agpl3Only;
-    maintainers = with lib.maintainers; [ mic92 equirosa urandom ];
+    maintainers = with lib.maintainers; [ mic92 equirosa urandom bkchr ];
     mainProgram = pname;
-    platforms = [ "x86_64-linux" ];
+    platforms = if builtins.stringLength version-aarch64 > 0 then [ "x86_64-linux" "aarch64-linux" ] else [ "x86_64-linux" ];
     sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
   };
 }