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d64b069053
Wails' Android entry point is `nativeInit`, which `MainActivity.onCreate`
calls, and it runs `go mainFunc()` every time. Android destroys and
recreates an activity **without restarting the process** -- a
configuration change the manifest does not declare, memory pressure, or
every background under "Don't keep activities" -- so main() ran again on
a live app.
Every path out of that is fatal. `application.New` returns the existing
app rather than building a second one, `app.Run()` then refuses because
`a.starting` is still true behind Android's `select{}`, and the
`os.Exit(1)` under that error takes the **first**, healthy app down with
it: its database, its queue, and the audio a mediaPlayback foreground
service is holding the process alive to play. ActivityManager restarts
the app, which is the report.
Measured on a Light Phone III (Android 14, arm64): conditional on the
activity actually being recreated, the process died 8 times out of 8.
The runs that "passed" were runs where no recreation happened, which is
the whole of the report's "sometimes". After this, 5/5 recreations
survive on one pid, plus six background/foreground cycles.
It never left evidence because os.Exit is not a crash: no tombstone, no
AndroidRuntime stack, nothing in `logcat -b crash`, and the slog line
naming the error went to /dev/null with the rest of fd 1.
The latch is first in main() because everything below it -- above all
NewYellowJacketApp, which opens the SQLite database -- is work that must
not happen twice in one process. It is inert off Android.
Returning early is not a degraded mode: nativeInit has already
re-pointed the JNI reference at the new bridge, so the recreated
WebView talks to the app that is still running, with its queue and
playback position intact. Verified by hooking dispatchWailsEvent on the
recreated page: IndexStatusChanged, JobsChanged, android:storageAccess.
No tier here runs main() on Android, so the guard is a source sweep, in
the spirit of TestNoDirectRuntimeEmits. The failure it exists for is not
the latch being deleted -- that is loud -- but a line creeping in above
it.
Closes #52
YellowJacket
Music how it was meant to bee.
YellowJacket is a fast, cross-platform desktop music player for your local collection. It plays your files, keeps your library tidy, and helps you discover and organize your music — all in a clean, responsive interface. No accounts, no streaming, no telemetry: just your music on your machine.
Runs on Linux, macOS, and Windows.
Features
Play your music
- Plays MP3, FLAC, OGG Vorbis, and WAV
- Play, pause, seek, and volume control with a mute toggle
- Gapless, glitch-free seeking backed by a read-ahead buffer
- A queue you can add to, reorder, and shuffle, with play-next support
- Shuffle and repeat (off / all / one)
- Picks up right where you left off — remembers your track, position, and volume between sessions
- Media-key and MPRIS support on Linux, so your desktop's playback controls just work
Keep your library organized
- Point it at your music folders and it scans them automatically
- Reads tags and embedded cover art, and de-duplicates artwork so it isn't stored twice
- Incremental sync — only new or changed files get reprocessed, and deleted files are cleaned up
- Browse by album, artist, or genre, or search across everything
- Mark favorites and see what you've been listening to with play history
- Edit track tags directly when something's off
Playlists
- Create playlists, drag tracks in, and reorder them
- Smart playlists that build themselves from rules (by genre, rating, play count, and more)
- Pin a default playlist and spot duplicate tracks at a glance
Discover and clean up (powered by MusicBrainz)
- Explore — browse artists, releases, and genres from the MusicBrainz catalog, not just what's already in your library
- Auto-tag — match your files against MusicBrainz to fill in correct artist, album, and track metadata, with a review step before anything is written
- Lyrics search — find a track by a line you remember
Install
Download the latest build for your platform from the releases page.
| Platform | Download |
|---|---|
| Linux | yellowjacket-linux-amd64 |
| macOS | yellowjacket-darwin-universal.app.zip (Apple Silicon + Intel) |
| Windows | yellowjacket-windows-amd64.exe |
Prefer to build it yourself? See Building from source.
Getting started
- Launch YellowJacket.
- Open Settings and add the folder(s) where your music lives.
- Let the initial scan finish — you'll see progress as it works.
- Browse by album, artist, or genre, queue something up, and press play.
Your library and settings are stored locally:
| Linux / macOS | Windows | |
|---|---|---|
| Config | ~/.config/yellowjacket/ |
%LOCALAPPDATA%\yellowjacket\config |
| Library data | ~/.local/share/yellowjacket/ |
%LOCALAPPDATA%\yellowjacket\data |
Building from source
YellowJacket is built with Go and a Lit/TypeScript frontend, bridged by the Wails framework.
Prerequisites
| Tool | Version |
|---|---|
| Go | 1.25+ |
| Node.js | 22+ |
| pnpm | 10+ |
| Wails CLI | v3 — vendored, no install needed (go tool wails3) |
The Wails v3 CLI resolves from the tool block in go.mod, so there is nothing
to install globally; make setup fetches it with the rest of the tooling.
On Linux, install the system libraries Wails needs. v3 builds against GTK4 + WebKitGTK 6.0 by default:
sudo apt-get install libasound2-dev libgtk-4-dev libwebkitgtk-6.0-dev # Debian/Ubuntu
sudo pacman -S alsa-lib gtk4 webkitgtk-6.0 # Arch
A machine without webkitgtk-6.0 can still build with -tags gtk3 against the
older WebKit2GTK 4.1 stack, but that is an escape hatch, not what CI or a
release builds.
macOS and Windows need no extra system packages. Run go tool wails3 doctor to
check your environment.
Build
make setup # install tooling and git hooks
make dev # run with hot-reload
make build-prod # produce a release binary
More detail for contributors lives in CLAUDE.md — the
architecture, the conventions and the reasons behind them. What is
being worked on is the issue
tracker; #73 is the
roadmap.