signal-desktop: Add a Python wrapper to re-encrypt DBs

This is super hacky... :o
But then again it should at least prevent data loss.

Note: At least this isn't required for NixOS 21.05.

1 files changed, 14 insertions, 1 deletions

diff --git a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
index 38d52b26bff..e1ba5884de7 100644
--- a/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-desktop/default.nix
@@ -10,6 +10,9 @@
 , hunspellDicts, spellcheckerLanguage ? null # E.g. "de_DE"
 # For a full list of available languages:
 # $ cat pkgs/development/libraries/hunspell/dictionaries.nix | grep "dictFileName =" | awk '{ print $3 }'
+, python3
+, gnome
+, sqlcipher
 }:
 
 let
@@ -112,7 +115,7 @@ in stdenv.mkDerivation rec {
 
     # Symlink to bin
     mkdir -p $out/bin
-    ln -s $out/lib/Signal/signal-desktop $out/bin/signal-desktop
+    ln -s $out/lib/Signal/signal-desktop $out/bin/signal-desktop-unwrapped
 
     runHook postInstall
   '';
@@ -137,6 +140,16 @@ in stdenv.mkDerivation rec {
     patchelf --add-needed ${libpulseaudio}/lib/libpulse.so $out/lib/Signal/resources/app.asar.unpacked/node_modules/ringrtc/build/linux/libringrtc.node
   '';
 
+  postFixup = ''
+    # This hack is temporarily required to avoid data-loss for users:
+    cp ${./db-reencryption-wrapper.py} $out/bin/signal-desktop
+    substituteInPlace $out/bin/signal-desktop \
+      --replace '@PYTHON@' '${python3}/bin/python3' \
+      --replace '@ZENITY@' '${gnome.zenity}/bin/zenity' \
+      --replace '@SQLCIPHER@' '${sqlcipher}/bin/sqlcipher' \
+      --replace '@SIGNAL-DESKTOP@' "$out/bin/signal-desktop-unwrapped"
+  '';
+
   # Tests if the application launches and waits for "Link your phone to Signal Desktop":
   passthru.tests.application-launch = nixosTests.signal-desktop;