145 lines
6.0 KiB
Markdown
145 lines
6.0 KiB
Markdown
<p align="center">
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<img src="assets/icon400.png" width="120" alt="LG Update Blocker">
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</p>
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# LG Update Blocker
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A webOS homebrew app that gets rid of the *"a new software version is
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available"* popup LG shows on every boot — without touching the firmware
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itself, and fully reversible.
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Built for a rooted **LG CX (webOS 5)**, but nothing in it is model specific: it
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only ever probes for things and acts on what it actually finds on your TV.
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## Why the popup keeps coming back
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The Homebrew Channel's own *Block system updates* toggle only writes four
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hostnames into `/etc/hosts` at boot. That is not enough in practice:
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* it misses several update hostnames (`nsu`, `*-ssl`, the CDN aliases),
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* it does nothing about a firmware image the TV **already downloaded** — a
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staged update keeps prompting even when the update servers are unreachable,
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* it leaves the auto-update settings and the update services alone.
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This app covers all of that, and re-applies everything on each boot (webOS
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resets `/`, `/tmp` and the mount namespace on every start).
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## Protection layers
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| Layer | What it does | Default |
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| --- | --- | --- |
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| **Block LG update servers** | Points `snu`/`su`/`nsu.lge.com`, their TLS variants, the `-dev` fallbacks and the CDN aliases at `127.0.0.1` in `/etc/hosts` | on |
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| **Delete staged firmware** | Wipes the update image staged in `/mnt/lg/cmn_data/swupdate` | on |
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| **Lock the staging folder** | Bind-mounts an empty read-only directory over it, so nothing can be staged again | off |
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| **Turn off auto-update settings** | Reads every `com.webos.settingsservice` category, switches off each update-related key it finds, and remembers the original values | on |
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| **Stop update services at boot** | Stops the update-related upstart jobs discovered in `/etc/init` (advanced) | off |
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Every layer is undone by **Remove protection**, which also restores the
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settings from the backup it made.
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## Requirements
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* A rooted webOS TV with the [Homebrew Channel](https://github.com/webosbrew/webos-homebrew-channel)
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installed and its root status showing **ok**.
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* The app's own service needs root. On first launch it asks the Homebrew
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Channel to elevate it (`elevateService`, falling back to running
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`elevate-service` through `exec`), then restarts itself. The header badge
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turns green when it worked.
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## Install
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### Through the Homebrew Channel (repository)
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Add the repository once — *Homebrew Channel → Settings → Add repository*:
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```
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https://github.com/<owner>/<repo>/releases/latest/download/apps.json
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```
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The app then shows up in the Homebrew Channel list, and every new release you
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tag is picked up automatically (that URL always points at the newest release).
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### Manually
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Download the `.ipk` from the release and:
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```sh
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ares-install com.rkievits.lgupdateblocker_1.0.0_all.ipk
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ares-launch com.rkievits.lgupdateblocker
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```
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## Using it
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Navigate with ▲▼, select with OK, leave with BACK.
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1. Check the layers you want (the defaults are a good start).
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2. **Apply protection** — the log pane shows exactly what was changed.
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3. Reboot and confirm the popup is gone.
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Other buttons: **Purge staged update** (wipe a downloaded image right now),
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**Remove protection** (undo everything), **Refresh status**, and
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**Diagnostics** (dumps OS info, mounts, discovered settings, the tail of
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`/etc/hosts` and the boot-hook log — handy for a bug report).
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## What it touches
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| Path | Purpose |
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| --- | --- |
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| `/etc/hosts` | Blocked hostnames, between `# >>> lg-update-blocker >>>` markers. Bind-mounted from `/tmp/lgupdateblocker-hosts` because `/` is read-only |
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| `/var/lib/webosbrew/init.d/lgupdateblocker` | Boot hook, run by the Homebrew Channel startup script; re-applies the enabled layers |
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| `/var/lib/webosbrew/lgupdateblocker/` | `config.json`, `hosts.txt`, `settings-backup.json`, `boot.log` |
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| `/mnt/lg/cmn_data/swupdate` | Staged firmware, emptied (and optionally locked) |
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Nothing is written to system partitions, and no LG binaries are patched or
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replaced.
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## Troubleshooting
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* **Badge says "no root"** — open the Homebrew Channel, verify *Root status* is
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`ok`, then relaunch this app. If the Homebrew Channel itself is unelevated,
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fix that first (its Settings screen has a button for it).
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* **Popup still appears after a reboot** — run *Diagnostics* and look at the
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boot-hook log at the bottom. It records, per boot, whether the hosts entries
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were added, what was purged and which jobs were stopped.
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* **Belt and braces** — a hosts file only helps if the TV uses DNS. Blocking
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`snu.lge.com`, `su.lge.com` and `nsu.lge.com` on your router or Pi-hole as
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well is the one measure that also survives a factory reset.
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* **Forced *app* updates** (the *"You must update this app to launch it"*
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dialog) are a different mechanism — that is what
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[LG App Update Blocker](https://github.com/dr0dr1dr2dr3/lgappupdateblocker)
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is for. This app deliberately leaves the `lgtvsdp.com` hosts alone, since
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blocking those also breaks the store and several other services.
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## Building
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No bundler, no runtime dependencies — `tools/build.js` copies `app/` and
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`service/` into `build/` and substitutes the app id and version.
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```sh
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npm install # only the ares CLI
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npm run dist # build + package + manifest, output in dist/
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npm run deploy # ares-install the resulting ipk
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```
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## Releasing
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`.github/workflows/release.yml` builds on every push. Tag a commit `v<version>`
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(matching `version` in `package.json`) and the workflow additionally publishes a
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release containing:
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* `com.rkievits.lgupdateblocker_<version>_all.ipk`
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* `com.rkievits.lgupdateblocker.manifest.json` — Homebrew Channel manifest,
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with the absolute ipk URL, its sha256 and size
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* `apps.json` — the one-package repository index used by the repository URL above
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* `description.html` — the long description shown in the Homebrew Channel
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The app id lives in exactly one place: the `name` field of `package.json`.
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Change it there and everything (appinfo, service name, Luna URIs, manifest)
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follows.
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## License
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MIT
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