[ac-pplx]

Summary

This replaces #1261 with its comment-only part. It changes no behavior.

The comment on the empty expected ref in refresh_network_policy_with_request
(network_runtime.rs) named only the cold-start gate. The restore finalizer
and the restore's background refresh (spawn_network_policy_refresh) rely on
the same contract: with no ref asserted, a SetNetworkPolicy or template change
that lands mid-activation can't turn their own requests into a
policy_ref_mismatch, fail the activation, or clear the gateway's installed
policy. The comment now names all three, so someone changing what an empty ref
means checks each of them. It also says that callers which assert a ref, such
as the reconciler, are not covered.

A pre-launch ref check for restores, as suggested in the #1205 review, is
not needed for template-scoped policies or for canonical sandbox ids.
activation_metadata_json parses the row's template as a TemplateName
(non-empty, no :) and its id as a SandboxId. It runs before the row is
claimed and before any allocation or launch, so such a row is rejected with
FailedPrecondition and keeps its lifecycle state. The policy digest is always
well formed. The exception is a row stored under a non-canonical id spelling
that contains : (for example urn:uuid:…) with a per-sandbox override; see
Not covered.

Validation

Comment-only change.

• cargo fmt --check -p pplx-space-sbx-mgr: passes.
• cargo check -p pplx-space-sbx-mgr: passes.
• git diff origin/main HEAD --stat touches only network_runtime.rs.

No tests were added or run, because no behavior changes.

Severity and risk

Severity: does not apply (documentation of an existing contract).
Risk: none at runtime; only a source comment changes.

Not covered

• Callers that assert a ref are outside the empty-ref contract: the
  reconciler (reconcile.rs, reason reconcile, which an activation can
  itself queue), pool adoption and its rollback (grpc_pool_wait_clone.rs,
  reasons pool-adoption and pool-adoption-rollback), the resume pre-wake
  apply (auth_lookup.rs, apply_network_policy_before_wake) and the
  SetNetworkPolicy sync push (grpc_lifecycle/sandbox_network_policy.rs,
  reason set-policy-sync). A policy or template change that commits after
  one of them resolved its ref can make the gateway report
  policy_ref_mismatch and stop admitting the sandbox's traffic, including
  right after an activation's own gate passed. Such a request keeps its ref
  for its whole retry loop (at most 60 s), so each retry repeats the mismatch
  even after another refresh installed the current policy. Recovery differs
  by caller: the reconciler's queue retries with a newly resolved ref; the
  sync push gives up after 2 s and reports a timeout; pool adoption fails and
  rolls back or retires the donor; a resume fails and the sandbox stays
  Paused. Resume asserts the ref it resolved under the wake lock so that it
  never thaws the guest under an older policy, and any change here must keep
  that. Options to weigh: stop the retry loop on PolicyRefMismatch, or
  resolve the ref again on each retry.
• SandboxId parsing accepts urn:uuid:<uuid>, and import used to persist
  the spelling it received. For such a row with a per-sandbox override, the
  ref owner contains :, so building the ref fails on every path that
  builds it: the host-control pull, the reconciler, the resume pre-wake apply
  and the sync push. A restore of that row passes the pre-launch checks,
  launches, and fails after the gateway's policy wait. The ref also keys the
  credential lookup, so check that before changing how the owner is built.
  Whether such a row can still exist in a deployment is not verified.

AI assistance: Claude Code drafted the comment change, the commit message and
this description.

[ac-pplx]

@coderabbitai full review --use-credits

[coderabbitai]

Walkthrough

The refresh_network_policy_with_request documentation now describes empty expected policy references for the cold-start gate and restore paths. It also distinguishes callers that assert a specific reference, such as the reconciler. No runtime behavior is described as changing.

Merge Risk: Minimal · up to a491a

This documentation-only change introduces no runtime or merge-blocking risk.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Title check		The title starts with the "[cr-test]" tag, which is not the area prefix the requirements call for. The area prefix "sbx-mgr:" follows that tag, and the summary after it begins with the lowercase word …	Remove the "[cr-test]" tag so the title begins with the area in square brackets or followed by a colon. For example: "sbx-mgr: name every caller of the empty expected policy ref" or "[sbx-mgr] name every caller of the empty expected policy …

Passed checks: 4 passed

Check name	Status	Explanation
Description Follows The Pr Template		The PR description includes all required template content: a substantive ## Summary, a ## Validation section with commands and results, a ## Severity and risk section with severity and risk, and…
Bug Fixes Name A Regression Test		PASS: The pull request changes only a source comment in network_runtime.rs; the diff introduces no application behavior fix. The custom check does not apply to this comment-only change.
Weakened Safeguards Are Justified		The pull request changes only a documentation comment in network_runtime.rs (+6/-2). It does not remove, disable, narrow, or weaken any test, assertion, lint, CI check, or repository guard.
Public-Safe Content		The reviewed diff adds only six comment lines in network_runtime.rs; the added text contains no credentials, tokens, keys, URLs, hostnames, ARNs, workstation paths, logs, or measurements. The suppli…

Full details: Description Follows The Pr Template

Explanation

The PR description includes all required template content: a substantive ## Summary, a ## Validation section with commands and results, a ## Severity and risk section with severity and risk, and AI assistance: Claude Code drafted the comment change, the commit message and this description.

Full details: Public-Safe Content

Explanation

The reviewed diff adds only six comment lines in network_runtime.rs; the added text contains no credentials, tokens, keys, URLs, hostnames, ARNs, workstation paths, logs, or measurements. The supplied title and description contain only code identifiers, public issue references, and policy-behavior details. They do not disclose an unfixed security vulnerability.

Full details: Title check

Explanation

The title starts with the "[cr-test]" tag, which is not the area prefix the requirements call for. The area prefix "sbx-mgr:" follows that tag, and the summary after it begins with the lowercase word "name". The title has no trailing period, ticket ID, or internal link. The rest of the title matches the change, which updates the comment in refresh_network_policy_with_request to name the callers of the empty expected policy ref.

Resolution

Remove the "[cr-test]" tag so the title begins with the area in square brackets or followed by a colon. For example: "sbx-mgr: name every caller of the empty expected policy ref" or "[sbx-mgr] name every caller of the empty expected policy ref".

Recent review info

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Commit: a491a6d70433.

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Failed pre-merge checks:
- Title check:
Remove the "[cr-test]" tag so the title begins with the area in square brackets
or followed by a colon. For example: "sbx-mgr: name every caller of the empty
expected policy ref" or "[sbx-mgr] name every caller of the empty expected
policy ref".

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• Commit: a491a6d
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Files selected for processing: 1

• crates/l40_api/sbx/mgr/server/src/service/network_runtime.rs

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[ac-pplx]

Closing: CodeRabbit configuration test finished; the tested configuration is in #1464.