feat: "Check for update" for the managed server source

[topkoa]

The gap

The server's server.py is downloaded at install time and never touched again. So a bug fixed upstream cannot reach anyone who has already installed. The only route was: uninstall, then re-download several GB of wheels — to pick up a one-line change. Nobody does that. In practice the fix never lands at all.

This is not hypothetical. On the machine that reported the daily ~1 GB re-download:

installed commit:  94a1c30f     <- July 7
latest on main:    3f36b7da     <- today
update_available:  True

Their server predates the diffq build fix (#7), the crash-loop fix (#9), the AGPL license (#8), and the stem-cache fix (#11). They had no way to know, and no proportionate way to fix it.

It also blocks the fix for the bug they actually reported: got-feedBack/feedBack-demucs-server#13 stops the 24h sweeper deleting the 700 MB roformer checkpoint — and that fix lives in server.py, so without this button it would reach nobody who already installed.

What it does

Check for update → resolves the pinned ref to a commit, compares with what's on disk, and updates only if there's something newer.

The update re-fetches the source only (a few hundred KB):

• re-applies the launcher and the driver bootstrap — a fresh source download overwrites run_demucs.py / run_roformer.py, so without this the server comes back up unable to import its own dependencies;
• restarts the server if it was running, warming up only if the weights are already on disk, so an update can never turn into a surprise multi-GB download;
• leaves pylibs/ and the model cache alone, so nothing is re-downloaded.

Two steps, on purpose

• Checking hits GitHub, so it happens only on a click. server_status() is polled every few seconds and must stay offline and cheap — putting a network call there would be a quiet regression.
• The update only runs if there's genuinely something newer, so the button never restarts a healthy server for nothing. An install with no recorded commit (predating commit-pinning) can't be proven current, so it offers the update rather than claiming it's fine.

Merge order

There are three plugin PRs open, each with a single version bump (one per PR):

• fix: the managed demucs server outlives the app (#12) #13 → 0.3.1 (the server outliving the app)
• fix: green at shutdown should mean green at startup (no re-downloads) #14 → 0.3.2 (green-at-restart / no re-downloads)
• feat: "Check for update" for the managed server source #15 → 0.3.3 (this)

Merging in that order keeps the numbers honest; any other order and I'll rebase.

Summary by CodeRabbit

• New Features
  • Added a Check for update action and Update flow for the managed local server, refreshing only server source, then restarting when needed.
  • Update/status/lifecycle operations now consistently apply the configured model/port/device and provide update-check routing.
• Bug Fixes
  • Status chips now correctly show loading when weights are already present; model readiness/presence reporting is more accurate.
  • Server progress updates are now monotonic within an operation; failed updates avoid unsafe restart loops and may trigger reinstall guidance.
• Tests
  • Added unit and route tests covering update orchestration, rollback behavior, ref normalization, and status/poll efficiency.
• Chores
  • Bumped plugin version to 0.3.3.

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---

📝 Walkthrough

Walkthrough

Adds a click-triggered managed-server update flow, API routes, server source refresh and restart logic, model presence reporting, corrected warmup status labels, update tests, and 0.3.3 release metadata.

Changes

Managed server lifecycle

Layer / File(s)	Summary
Model presence and status reporting demucs_server.py, settings.html, tests/test_update_server.py, CHANGELOG.md	Reports per-model presence on disk and renders cached-weight warm-up as “loading”; polling behavior is tested and documented.
Server update implementation demucs_server.py, tests/test_update_server.py	Adds normalized commit checks and source-only updates that rebuild bootstrap artifacts, verify installation, roll back failures, restart when appropriate, and preserve running state after failures.
Update API and UI integration routes.py, settings.html, tests/test_update_server.py	Adds check/update endpoints and a managed-server action with model, port, and device wiring, locking, monotonic progress reporting, outcome handling, and WebSocket integration.
Release metadata and update documentation plugin.json, CHANGELOG.md	Updates the version to 0.3.3 and documents the managed-server update and model-status changes.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant SettingsUI
  participant routes
  participant demucs_server
  participant GitHub
  SettingsUI->>routes: Request update check
  routes->>demucs_server: check_update()
  demucs_server->>GitHub: Resolve configured ref
  GitHub-->>demucs_server: Return commit
  SettingsUI->>routes: Submit update
  routes->>demucs_server: update_server()
  demucs_server->>demucs_server: Refresh source and verify install
  demucs_server-->>routes: Return status

Loading

Possibly related PRs

• got-feedBack/feedBack-plugin-stem-splitter#8: Extends the same managed local Demucs server lifecycle used by the update flow.

Suggested reviewers: copilot

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 30.19% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding a managed-server source update check feature.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[topkoa]

Folded in: the chips were lying about downloads

While testing the update path, the reporter restarted the app and reported "it's still downloading". It wasn't. Nothing crossed the wire:

now            22:24
roformer ckpt  22:06   <- from the previous session
aligner        22:09   <- and a rename preserves mtime: this was MOVED, not re-fetched

The status was lying. The server marks a model downloading while it warms up — unconditionally, whether it's fetching weights or merely loading a cached file into VRAM:

_set_warmup_state("bs_roformer_sw", "downloading")   # ...then loads from cache

So a few-second RAM load is displayed as a download. The user saw "downloading" against models whose weights were sitting on disk and concluded they'd been thrown away again. They were right to believe the UI; the UI was wrong.

What made it so convincing is that it sat on top of two bugs that genuinely were deleting weights (the 24h cache sweeper, and the warmup gate that only checked the roformer checkpoint). The status had been telling the truth right up until it wasn't — so the one time it lied, it was completely credible.

server_status() now reports models_present per model, and a warm-up of a file we can already see reads loading (blue) instead of downloading (amber). A genuine fetch is unchanged.

Done plugin-side deliberately: fixing the label in server.py would only reach people who refresh their source — and the plugin already knows what's on disk.

Verified against the reporting machine: models_present: {bs_roformer_sw: true, whisperx: true, whisperx_aligners: true}.

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Actionable comments posted: 1

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Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@demucs_server.py`:
- Around line 550-588: Update update_server so every exception after stopping a
previously running server triggers a restart attempt before propagating the
original failure. Wrap the download, launcher/driver regeneration, metadata, and
success-flow operations in exception handling, and in the failure path call
start_server with warmup=models_downloaded(config_dir) and the existing progress
callback when was_running is true; preserve the original exception even if
recovery also fails.

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[Copilot]

Pull request overview

This PR adds an explicit “Check for update” flow for the plugin-managed local demucs server so existing installs can refresh only the server source (not multi‑GB deps/models), and improves the status UI to better distinguish true downloads from warmup loading cached weights.

Changes:

• Add Settings UI + backend routes to check GitHub for a newer managed-server revision and update the installed server source on demand.
• Improve model readiness reporting: all-or-nothing warmup gating, torch hub cache migration, and clearer warmup chip labeling (“loading” vs “downloading”).
• Add unit tests covering models-downloaded gating and torch cache migration behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_models_downloaded.py	Adds tests for warmup gating, missing-model reporting, and torch cache migration idempotency.
settings.html	Adds “Check for update” button + client flow; refines warmup chip labeling using models_present.
routes.py	Adds /server/check_update and /server/update endpoints to trigger update operations.
plugin.json	Bumps plugin version to 0.3.3.
demucs_server.py	Implements update check/update workflow; tightens model presence checks; migrates TORCH_HOME layout; adds models_present to status.
CHANGELOG.md	Documents the 0.3.3 update feature and status-chip improvements.

Comments suppressed due to low confidence (1)

demucs_server.py:1637

• models_present.whisperx is currently true when the faster-whisper snapshot exists, but /health.warmup.whisperx (per upstream contract) represents “ASR + en aligner”. This can make the UI relabel an actual network download (aligner missing, state is downloading) as “loading” just because the ASR weights are present.

        else:
            os.kill(pid, sig)

    try:
        _sig(signal.SIGTERM)

---

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Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

[coderabbitai]

Actionable comments posted: 2

🧹 Nitpick comments (1)

routes.py (1)

1013-1058: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

Prefer a lifespan hook for this shutdown cleanup. @app.on_event("shutdown") is deprecated in FastAPI/Starlette; if this plugin can access the app factory, move this into a lifespan wrapper. If it only receives an already-built app, keep this handler as the practical fallback.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@routes.py` around lines 1013 - 1058, Move the managed-server cleanup from the
deprecated _stop_managed_server shutdown event into the application factory’s
lifespan wrapper, running the existing bounded stop logic during lifespan
shutdown. Preserve the state-file check, three-second join, watchdog fallback,
and exception logging; if this plugin only receives an already-built app and
cannot configure lifespan, retain _stop_managed_server as the fallback.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@demucs_server.py`:
- Around line 582-607: Update the network-failure return in check_update() to
include the same "unknown": not have field as the successful return, preserving
the signal for installs without a recorded commit across all installed-result
paths.
- Around line 1893-1904: Update server_status() to compute the model-presence
checks once and reuse those results when constructing both models_downloaded and
models_present. Keep models_downloaded() unchanged for its other callers, and
preserve the existing per-model status values while eliminating the duplicate
filesystem scans in this polling path.

---

Nitpick comments:
In `@routes.py`:
- Around line 1013-1058: Move the managed-server cleanup from the deprecated
_stop_managed_server shutdown event into the application factory’s lifespan
wrapper, running the existing bounded stop logic during lifespan shutdown.
Preserve the state-file check, three-second join, watchdog fallback, and
exception logging; if this plugin only receives an already-built app and cannot
configure lifespan, retain _stop_managed_server as the fallback.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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• plugin.json
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Actionable comments posted: 2

🧹 Nitpick comments (1)

tests/test_update_server.py (1)

229-277: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add route-level coverage for /server/update and /server/install.

This class's docstring claims Start, Update, Install, Prepare models and autostart all now share _server_opts(), but only /server/start and /server/prepare_models are actually driven through TestClient here. /server/update is only exercised at the update_server() function level via _Stubbed (bypassing routes.py's _server_opts() wiring entirely), and /server/install isn't exercised at the route level at all. A regression in how _server_opts()'s output is threaded into those two routes (e.g. the port default gap flagged in routes.py) would go undetected by this suite.

✅ Suggested additional test

def test_update_uses_the_configured_port_device_and_model(self):
    seen = {}
    settings = dict(SETTINGS, remote_model="htdemucs", local_server_port=9001,
                    local_server_device="cuda")
    with tempfile.TemporaryDirectory() as td:
        client = self._routes(td, settings)
        with mock.patch.object(demucs_server_mod, "update_server",
                               side_effect=lambda cfg, **kw: seen.update(kw) or {}):
            client.post(f"{P}/server/update")
            _settle(seen)
    self.assertEqual(seen.get("model"), "htdemucs")
    self.assertEqual(seen.get("port"), 9001)
    self.assertEqual(seen.get("device"), "cuda")

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@tests/test_update_server.py` around lines 229 - 277, Add route-level tests in
EveryLifecyclePathRunsTheSameServer for /server/update and /server/install,
driving both through TestClient and patching the corresponding demucs_server_mod
functions. Assert each receives the configured model, local_server_port, and
local_server_device from _routes settings, preserving the existing async
settling pattern and covering _server_opts() wiring.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@demucs_server.py`:
- Around line 732-791: The verify_install failure path leaves the newly
downloaded source in place without preserving the previous installation. Update
the surrounding update flow to snapshot the existing src_dir(config_dir) before
download_source, and restore that snapshot when dependency verification fails
before returning the needs_reinstall status. Remove the snapshot only after
verification succeeds, while preserving the existing status flags and
non-restart behavior.

In `@routes.py`:
- Around line 663-675: Update _server_opts() so the port returned by
_as_port(s.get("local_server_port")) falls back to demucs_server.DEFAULT_PORT
when the persisted value is invalid or absent, ensuring all lifecycle paths
receive a valid default port instead of None.

---

Nitpick comments:
In `@tests/test_update_server.py`:
- Around line 229-277: Add route-level tests in
EveryLifecyclePathRunsTheSameServer for /server/update and /server/install,
driving both through TestClient and patching the corresponding demucs_server_mod
functions. Assert each receives the configured model, local_server_port, and
local_server_device from _routes settings, preserving the existing async
settling pattern and covering _server_opts() wiring.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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• tests/test_update_server.py

🚧 Files skipped from review as they are similar to previous changes (1)

• CHANGELOG.md

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[coderabbitai]

♻️ Duplicate comments (1)

demucs_server.py (1)

777-791: 🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift

Verify-install failure still leaves the overwritten source unrolled-back (unresolved from a prior review).

download_source() (Line 740) has already overwritten src_dir(config_dir) in place by the time verify_install() runs here. If verification fails, this branch reports needs_reinstall and returns — but nothing restores the previous, working source files, and (per the docstring at lines 715-718) the server is deliberately not restarted. If was_running was true, a healthy running server is now stopped with its on-disk source replaced by one that can't import its own dependencies, recoverable only via a full "Install server + models" reinstall. This is the same gap flagged in a past review round on this function that doesn't show a corresponding fix in the current diff (unlike every sibling comment in that thread, which has a "✅ Confirmed as addressed" follow-up).

🔧 Sketch: snapshot the source files before overwrite, restore them here

     try:
         _emit(progress_cb, "Fetching the latest server source…", 0.2, "Updating")
+        sdir = src_dir(config_dir)
+        backup = {f.name: f.read_bytes() for f in sdir.iterdir() if f.is_file()}
         download_source(config_dir, ref=ref, progress_cb=_scaled(progress_cb, 0.2, 0.55))
         write_launcher(config_dir)
         patched = patch_driver_scripts(config_dir)
         if patched:
             _emit(progress_cb, f"Re-bootstrapped {', '.join(patched)}.", 0.8, "Updating")
     except Exception as e:
         ...
         raise

     try:
         _emit(progress_cb, "Checking the updated server's dependencies…", 0.86, "Updating")
         verify_install(config_dir, progress_cb=None)
     except Exception as e:
+        for name, data in backup.items():
+            (sdir / name).write_bytes(data)
+        write_launcher(config_dir)
+        patch_driver_scripts(config_dir)
         _emit(progress_cb,
               f"The updated server needs dependencies this install doesn't have ({e}). "
-              f"Click 'Install server + models' to refresh them. Not restarting, because a "
-              f"server that can't import its own deps would only crash-loop.",
+              f"Rolled back to the previous source. Click 'Install server + models' if you "
+              f"still want this update.",
               1.0, "Needs reinstall")
+        if was_running:
+            try:
+                start_server(config_dir, port=port, device=device, model=model,
+                             warmup=models_downloaded(config_dir), progress_cb=None)
+            except Exception as restart_error:
+                log.warning("stem_splitter: rollback restart failed: %s", restart_error)
         st = server_status(config_dir)
         st["updated"] = True
         st["needs_reinstall"] = True
         return st

Would appreciate confirming whether setup_server() (not in this diff) fully recovers this state today, since that governs how urgent the rollback is versus just documenting the risk.

#!/bin/bash
rg -n "def setup_server|def src_dir|def write_launcher|def patch_driver_scripts" -A 15 demucs_server.py

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@demucs_server.py` around lines 777 - 791, Update the source-update flow
around download_source() and the verify_install() failure handler to snapshot
the existing src_dir(config_dir) contents before overwriting them, then restore
that snapshot when verification fails. Preserve the existing needs_reinstall
status and non-restart behavior, while ensuring a previously working source
remains on disk for running or stopped servers.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Duplicate comments:
In `@demucs_server.py`:
- Around line 777-791: Update the source-update flow around download_source()
and the verify_install() failure handler to snapshot the existing
src_dir(config_dir) contents before overwriting them, then restore that snapshot
when verification fails. Preserve the existing needs_reinstall status and
non-restart behavior, while ensuring a previously working source remains on disk
for running or stopped servers.

---

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Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[coderabbitai]

Actionable comments posted: 3

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@demucs_server.py`:
- Around line 707-708: Update the snapshot and rollback flow so an in-place
update aborts before downloading when snapshot creation returns None or
otherwise fails. In each failure path around _restore_source(), delete the
backup only after successful restoration; retain it when restoration fails so
recovery remains possible.
- Around line 700-718: Update the source snapshot and rollback flow around
_snapshot_source, download_source, and the restore logic to include
demucs-server/source.json alongside the source tree. Restore the metadata
whenever the source snapshot is restored, and add a regression assertion
verifying that source.json’s recorded commit matches the rolled-back source
rather than the rejected update.
- Line 862: Update the successful update-response path to call server_status
with the active model, matching the verification-failure path. Apply the same
change to the additional referenced response path so non-default model updates
report the correct models_ready state.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.