Tauri's Linux updater can only self-update AppImage bundles, so deb/rpm/
pacman and Flatpak installs showed a "Software Update" prompt that could
never apply. READEST_DISABLE_UPDATER also had no effect: the variable
reached the process, but its value only flowed to the frontend through a
WebView init-script global (window.__READEST_UPDATER_DISABLED) that is
not reliably visible to page scripts on Linux/WebKitGTK.
Make the decision authoritative in Rust and read it over IPC:
- Add compute_updater_disabled (pure, unit-tested) plus the
is_updater_disabled desktop command: an env opt-out, Flatpak, or a
Linux non-AppImage install disables the updater. setup() reuses the
same helper for the init-script global.
- NativeAppService.init() sets hasUpdater from the command for desktop
apps instead of relying on the init-script global.
Non-AppImage Linux installs now defer to the system package manager and
fall back to the "What's New" release notes.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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