Siavash Sameni 7639aaf08d feat(desktop): deterministic alias from seed + git hash on home screen + fix EACCES on Android ...

Three home-screen issues from the first Tauri Android APK:

1. Alias was empty (no seed-derived name).
   Port the adjective+noun word lists from the old Kotlin SettingsRepository
   into a `derive_alias()` helper that maps the first 4 bytes of the seed to
   indices in those lists. Same seed → same alias forever, different seeds →
   effectively random aliases — so reinstalls keep the user's identity AND
   the friendly name they're used to.

2. Build identity was invisible — couldn't tell which APK was actually
   installed (this caused us a lot of grief on the Kotlin app).
   build.rs now captures `git rev-parse --short HEAD` and emits it as
   `WZP_GIT_HASH`, exposed via a new `get_app_info` command. The frontend
   stamps `build <hash> • <alias>` under the fingerprint on the home screen.

3. Register on relay failed with `Permission denied (os error 13)`.
   Root cause: I hardcoded `/data/data/com.wzp.phone/files/.wzp` as the
   identity dir, but the Tauri Android package id is `com.wzp.desktop` —
   so the app was trying to write into another app's data directory and
   getting EACCES at the filesystem layer. Fix: resolve the data dir from
   Tauri's `path().app_data_dir()` API in the `setup()` callback and stash
   it in a `OnceLock<PathBuf>`. Works on Android, macOS, Linux, Windows
   without any cfg gymnastics.

Also: `get_app_info` returns the resolved `data_dir` so we can debug
storage issues from the UI (it's set as the build-hash element's title).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-09 11:55:51 +04:00

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