The app forgot everything it did the moment it exited. The Rust half
logged through env_logger to stdout only -- invisible to anyone who
launched from a desktop icon, and on Android worse than that: stdout is
not logcat, so the backend produced no visible output at all on the
platform carrying this project's hardest bugs. The autoplay deadlock,
the truncated-stream restart and the background-audio stall were all
diagnosed by talking a user through `adb logcat`, because there was no
other way to see anything. A panic left nothing behind at all.
Logs now go to a size-capped rotating file, to logcat on Android, and to
the webview console in dev. A panic is recorded with its backtrace before
the process dies. The frontend's messages are forwarded into the same
file, so one timeline holds both halves of the app in order -- which is
what makes a race between them legible after the fact, and races between
them are the expensive bug class here.
Redaction runs in the log FORMATTER, not at export time. A credential
sitting in a file on the device is already a disclosure; stripping it on
the way out would be too late. The exporter redacts a second time to
cover files written by builds that predate this. api_key, X-Emby-Token,
Authorization, "AccessToken" and Token="..." all reduce to [REDACTED],
while host, item ids and filenames are deliberately kept -- a log scrubbed
of those is one nobody can debug anything from. Server URLs keep scheme
and host and drop any embedded user:pass@.
Two things the tests caught that review would not have:
- redact_headers recursed on its own output. The replacement keeps the
header NAME, so the next call matched the same header forever; the
test died with a stack overflow. It is a forward scan now.
- The frontend forwarder used `void plugin.error(...)`. `void` discards
a promise's value but not its rejection, so in any webview without
IPC -- a unit test, SSR, a browser preview -- every log line became an
unhandled rejection. 20 of them showed up the first time coverage
ran. Each call now attaches a catch.
Only info and above cross the IPC boundary: debug is per-tick player
state and forwarding it would be thousands of calls a minute for output
nobody reads. A failing forwarder never propagates and never prevents the
console write.
Nothing is transmitted anywhere. The export writes a zip and reports its
path; the user attaches it themselves, which is also what keeps this from
becoming telemetry. An Android share intent is explicitly out of scope --
it is Kotlin work that belongs with the other native code.
The panic hook chains to the previous hook rather than replacing it,
because utils/lock.rs installs a silencing hook around tests that provoke
poisoned locks on purpose.
Spec in docs/specs/diagnostics-and-logging.md; UR-078 / DR-218 / UT-209.
Verified: 1079 frontend tests and the coverage gate, 759 Rust tests,
clippy -D warnings, svelte-check 0 errors, and cargo check for
aarch64-linux-android.

JellyTau
A cross-platform Jellyfin client built with Tauri, SvelteKit, and TypeScript.
Business logic lives in a Rust backend; a UI-rich Svelte frontend handles presentation and talks to it over Tauri's IPC. Targets Linux (libmpv) and Android (ExoPlayer).
Getting Started
This project uses bun as its package manager.
# Activate the Rust environment (fish shell)
source "$HOME/.cargo/env.fish"
# Install dependencies
bun install
# Run in development
bun run tauri dev
# Type-check the frontend
bun run check
# Build for Linux
bun run tauri build
# Build for Android
bun run tauri android build
For the full set of build, test, and Android helper scripts, see scripts/README.md.
Documentation
| Topic | Location |
|---|---|
| Architecture overview & subsystem docs | docs/architecture/ |
| Requirements, traceability & technical debt | docs/requirements.md |
| Build & release process | docs/build/build-release.md |
| Docker builds | docs/build/docker.md |
| Traceability tooling & CI | docs/traceability.md, docs/traceability-ci.md |
| Release checklist | docs/release-checklist.md |
| UX flows | docs/ux-flows.md |
| CI operations (builder image, secrets, runner) | docs/build/ci-operations.md |
Contributing
CONTRIBUTING.md covers the setup, the gates a change has to pass, and the two rules that catch people out (bug fixes start with a failing test; Jellyfin's taxonomy stays in Rust). Please also read the Code of Conduct.
Found a security problem? Do not open an issue — see SECURITY.md.
Verifying a download
Every release publishes SHA256SUMS covering all of its artifacts, plus an SBOM
of what went into the build:
sha256sum -c SHA256SUMS
Desktop builds update themselves from Settings → Updates, verifying each payload against JellyTau's signing key before installing. Android installs are handled by the system installer, so the app links to the releases page instead.
Recommended IDE Setup
VS Code + Svelte + Tauri + rust-analyzer.
License
MIT