mara on #685: "do the post build step. check if there are any more file
that should have been built." Investigated the full diff between
`pkgs.fluffychat-web` (nixpkgs's nix-built dist) and the upstream
prebuilt release tarball. **Three** files missing from the nix build:
1. `native_executor.js` — flutter web worker entry. Source is
`web/native_executor.dart` in fluffychat. `flutter341.buildFlutterApplication`
skips `web/*.dart` worker entries; needs a separate `dart compile js`
pass. Solved by adding `pkgs.flutter341.dart` to nativeBuildInputs +
`dart compile js` in postInstall.
2. `Imaging.js` (~10 KB) + `Imaging.wasm` (~67 KB) — emscripten-compiled
C library from the `native_imaging` dart package (vendored by
Famedly). The package ships only C source + a Makefile that builds
them via `emcc`; the package does NOT ship prebuilt versions —
they're expected to be built at install time. nixpkgs's flutter
builder doesn't run that pipeline. Two paths considered:
- run emcc at build time: +~600 MB of `pkgs.emscripten` closure
for two files
- vendor the prebuilt files from the upstream release tarball:
same fluffychat release version → byte-identical output
Chose vendoring (cheaper closure, same result). Pinned to
`pkgs.fluffychat-web.version`-templated URL with sha256, so a
version bump auto-fetches the matching prebuilt.
The single other missing file (`native_executor.js.deps`) is a Dart
build-metadata artefact, not used at runtime — ignored.
Mechanics: two new `let`-bindings in `nix/modules/hive-matrix.nix`:
- `fluffychat-web-imaging-prebuilt` — small `runCommandLocal` that
fetches the upstream `fluffychat-web.tar.gz` and extracts just the
two Imaging files. Hash pinned, URL templated on the nixpkgs
fluffychat-web version.
- `fluffychat-web-fixed` — `pkgs.fluffychat-web.overrideAttrs` carrying
forward the existing `--base-href "/matrix/"` override (#634) plus
the new postInstall that runs `dart compile js` on
`web/native_executor.dart` and installs the two Imaging files from
the prebuilt derivation.
Then `services.hyperhive.matrix.gui.package`'s default flips from the
inline overrideAttrs to `fluffychat-web-fixed`.
Symptom this resolves: fluffychat-web's blank-page-after-load (#643)
caused by `main.dart.js` requesting `native_executor.js` and the SPA
runtime never booting. With `native_executor.js` present + the
gateway-side SPA-fallback fix (#684 making missing assets visible),
flutter's bootstrap completes and the login form is usable.
Verified `nix eval` produces a different derivation hash than the
unpatched `pkgs.fluffychat-web` (aag55wgh... vs ldgcxy50...),
confirming the override takes effect. Full closure build pending
operator deploy — local sandbox networking flaky.
Closes#685.
a11d508bee