Wires in the option-(a) sidecar approach: the AppImage carries a
bundled AppImageUpdate AppImage and an embedded update-info string
in the .upd_info ELF section. BackendConnection drives both the
check and the apply via QProcess.
BackendConnection:
- Q_INVOKABLE checkForUpdates()
Bundled mode only. Spawns AppImageUpdate.AppImage with
--check-for-update <APPIMAGE>. Exits 0 → noUpdatesAvailable,
1 → updatesAvailable, anything else → updateCheckFailed.
Dev mode: emits updateCheckFailed("…dev-mode only").
- Q_INVOKABLE applyUpdate()
Bundled mode only. Spawns AppImageUpdate.AppImage with
--remove-old <APPIMAGE>. Replaces the running AppImage in
place; user must restart. Emits updateApplied or
updateApplyFailed.
- Sidecar path resolves to applicationDirPath()/AppImageUpdate.AppImage
by default, overridable via BRIDGE_APPIMAGEUPDATE_BIN.
- APPIMAGE env (set by the AppImage runtime) determines the target
file. Outside an AppImage both methods fail loudly.
build-appimage.sh:
- Auto-downloads AppImageUpdate-x86_64.AppImage into the cached
tools dir and copies it into AppDir/usr/bin/AppImageUpdate.AppImage.
- New --update-info flag, forwarded to appimagetool's -u so the
.upd_info ELF section carries an "zsync|<URL>" string the sidecar
will fetch.
examples/todo Makefile forwards APPIMAGE_UPDATE_INFO env to the
script as --update-info.
release.yml:
- Builds the AppImage with APPIMAGE_UPDATE_INFO set to the canonical
Gitea Releases asset URL for this tag.
- Installs zsync, runs zsyncmake to generate Todo-x86_64.AppImage.zsync.
- Generates a JSON appcast (latest.json) with version / url / sha256 /
size / zsync URL / released_at — useful as an HTTP-fetchable
fallback for clients that prefer a structured manifest.
- SHA256SUMS now covers AppImage + zsync + latest.json.
- Uploads all four assets to the Gitea Release.
AppImage size grows from ~104 MB to ~152 MB with the sidecar bundled.
Embedding verified: objdump shows .upd_info populated with the
expected zsync URL after a local build.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
magdev
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