Hide Cloud Hypervisor runtime backend implementation

[Copilot]

The Cloud Hypervisor runtime backend class was exported despite having no external production consumers, expanding the API surface of a security-critical microVM boundary.

• API surface

  • Made CloudHypervisorRuntimeBackend file-private.
  • Kept createCloudHypervisorRuntimeBackend() as the public construction path.
  • Returned the public ExternalAgentRuntimeBackend interface from the factory.

• Tests

  • Replaced direct test imports/construction of the backend class with an internal test helper seam.
  • Preserved dependency injection coverage without exposing the implementation class.

export function createCloudHypervisorRuntimeBackend(
  config: WrapperConfig,
  startInfrastructure: WorkflowDependencies['startContainers'],
): ExternalAgentRuntimeBackend {
  return new CloudHypervisorRuntimeBackend(config, defaultDependencies(startInfrastructure));
}

class CloudHypervisorRuntimeBackend implements ExternalAgentRuntimeBackend {
  // private implementation detail
}

• Fixes [Export Audit] CloudHypervisorRuntimeBackend - unused export in security-critical module #7691

[Copilot]

Pull request overview

Hides the Cloud Hypervisor backend implementation behind its public interface, resolving #7691.

Changes:

• Makes the implementation class file-private.
• Adds an internal dependency-injection test helper.
• Updates tests to use public or test-specific factory seams.

Show a summary per file

File	Description
src/cloud-hypervisor-runtime-backend.ts	Narrows the exported API and adds a test construction helper.
src/cloud-hypervisor-runtime-backend.test.ts	Replaces direct class construction with factory helpers.

Review details

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• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Balanced

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✅ Copilot review passed with no inline comments.

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✅ Coverage Check Passed

Overall Coverage

Metric	Base	PR	Delta
Lines	93.85%	93.87%	📈 +0.02%
Statements	92.73%	92.74%	➡️ +0.01%
Functions	93.16%	93.16%	➡️ +0.00%
Branches	86.11%	86.12%	📈 +0.01%

📁 Per-file Coverage Changes (1 files)

File	Lines (Before → After)	Statements (Before → After)
src/log-directory-setup.ts	96.2% → 100.0% (+3.78%)	96.3% → 100.0% (+3.71%)

---

Coverage comparison generated by scripts/ci/compare-coverage.ts

[github-actions]

📰 VERDICT: Smoke Copilot has concluded. All systems operational. This is a developing story. 🎤

📰 BREAKING: Report filed by Smoke Copilot

[github-actions]

✨ The prophecy is fulfilled... Smoke Codex has completed its mystical journey. The stars align. 🌟

Warning

Firewall blocked 3 domains

The following domains were blocked by the firewall during workflow execution:

• msfeed2.pkgs.visualstudio.com
• msfeed25.pkgs.visualstudio.com
• registry.npmjs.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "msfeed2.pkgs.visualstudio.com"
    - "msfeed25.pkgs.visualstudio.com"
    - "registry.npmjs.org"

See Network Configuration for more information.

🔮 The oracle has spoken through Smoke Codex

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✅ Smoke Copilot BYOK AOAI (Entra) completed. Copilot AOAI BYOK (Entra) mode operational. 🔓

🪪 BYOK (AOAI Entra) report filed by Smoke Copilot BYOK AOAI (Entra)

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🚀 Security Guard has started processing this pull request

[github-actions]

✅ Smoke Claude passed

Generated by Smoke Claude for #7700

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📡 Smoke OTel Tracing completed. All tracing scenarios validated. ✅

📡 OTel tracing validated by Smoke OTel Tracing

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✅ Build Test Suite completed successfully!

Generated by Build Test Suite for #7700

[github-actions]

❌ Smoke Gemini reports failed. Facets need polishing...

💎 Faceted by Smoke Gemini

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✅ Smoke Copilot BYOK AOAI (api-key) completed. Copilot AOAI BYOK (api-key) mode operational. 🔓

🔑 BYOK (AOAI api-key) report filed by Smoke Copilot BYOK AOAI (api-key)

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🛡️ Smoke Copilot Network Isolation confirmed the egress allowlist is enforced. ✅

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• example.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "example.com"

See Network Configuration for more information.

🛡️ Egress verdict from Smoke Copilot Network Isolation

[github-actions]

🔌 Smoke Services — All services reachable! ✅

🔌 Service connectivity validated by Smoke Services

[github-actions]

Chroot tests passed! Smoke Chroot - All security and functionality tests succeeded.

Tested by Smoke Chroot

[github-actions]

📰 VERDICT: Smoke Docker Sbx has concluded. All systems operational. This is a developing story. 🎤

📰 BREAKING: Report filed by Smoke Docker Sbx

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❌ Contribution Check failed. Please review the logs for details.

Generated by Contribution Check for #7700

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✅ Smoke Copilot BYOK completed. Copilot BYOK mode operational. 🔓

🔑 BYOK report filed by Smoke Copilot BYOK

[github-actions]

Smoke Test: Copilot Engine

✅ GitHub MCP connectivity (PR #7695: Upgrade gh-aw workflows to latest pre-release)
✅ GitHub.com connectivity (HTTP 200)
✅ File write/read test

Overall: PASS

cc @lpcox

📰 BREAKING: Report filed by Smoke Copilot
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Smoke Test: Claude Engine Validation

Check	Result
API status	✅ PASS
gh check	✅ PASS
File status	✅ PASS

Overall result: PASS

Generated by Smoke Claude for #7700 · haiku45 · 55.7 AIC · ⊞ 4.5K · ◷
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[github-actions]

EGRESS_RESULT allow=pass deny=pass

✅ Allowed domain (github.com) reachable: allowed=200
✅ Non-allowed domain (example.com) blocked: denied=000 (CONNECT tunnel failed, 403)

Overall: PASS

@lpcox

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• example.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "example.com"

See Network Configuration for more information.

🛡️ Egress verdict from Smoke Copilot Network Isolation
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[github-actions]

Docker Sbx Smoke Test — @lpcox

• ✅ GitHub MCP: matches (PR Upgrade gh-aw workflows to latest pre-release #7695 "Upgrade gh-aw workflows to latest pre-release", PR fix: preserve agent startup with restricted tmp #7679 "fix: preserve agent startup with restricted tmp")
• ✅ GitHub.com connectivity: HTTP 200
• ✅ File write/read: verified

Overall: PASS

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@lpcox

GitHub MCP PRs: Make digest image validation internals private; Keep default image constants internal: ✅
GitHub.com connectivity: ✅
File write/read: ✅
BYOK inference: ✅
Running in direct BYOK mode (COPILOT_PROVIDER_API_KEY + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw)
Overall: PASS

🔑 BYOK (AOAI api-key) report filed by Smoke Copilot BYOK AOAI (api-key)
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Chroot Version Comparison Results

Runtime	Host Version	Chroot Version	Match?
Python	Python 3.12.14	Python 3.12.14	✅ YES
Node.js	v24.19.0	v22.23.2	❌ NO
Go	go1.22.12	go1.22.12	✅ YES

Overall: FAILED — Node.js version mismatch between host and chroot environment. The smoke-chroot label was not added since not all tests passed.

Tested by Smoke Chroot
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Smoke Test: Copilot BYOK (Direct) Mode ✅ PASS

• ✅ GitHub.com connectivity (HTTP 200)
• ✅ File write/read test (smoke-test-copilot-byok.txt)
• ✅ BYOK inference path (api-proxy → api.githubcopilot.com)
• ✅ MCP connectivity (PR data verified)

Running in direct BYOK mode via COPILOT_PROVIDER_API_KEY with api-proxy sidecar injection.

🔑 BYOK report filed by Smoke Copilot BYOK
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Smoke Test Results: GitHub Actions Services Connectivity

• Redis PING: ❌ (name resolution failure)
• PostgreSQL pg_isready: ❌ (no response)
• PostgreSQL SELECT 1: ❌ (name resolution failure)

REDIS=Could not connect to Redis at host.docker.internal:6379: Temporary failure in name resolution
PG_READY=host.docker.internal:5432 - no response
PG_QUERY=psql: error: could not translate host name "host.docker.internal" to address: Temporary failure in name resolution

Overall: FAIL — host.docker.internal could not be resolved from within the AWF sandbox.

🔌 Service connectivity validated by Smoke Services
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[github-actions]

Upgrade gh-aw workflows to latest pre-release
fix: preserve agent startup with restricted tmp

GitHub MCP: ❌
safeinputs-gh PR query: ❌
Playwright title: ✅
File write/read: ✅
Discussion query/comment: ❌
Build AWF: ✅
Overall: FAIL

Warning

Firewall blocked 3 domains

The following domains were blocked by the firewall during workflow execution:

• msfeed2.pkgs.visualstudio.com
• msfeed25.pkgs.visualstudio.com
• registry.npmjs.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "msfeed2.pkgs.visualstudio.com"
    - "msfeed25.pkgs.visualstudio.com"
    - "registry.npmjs.org"

See Network Configuration for more information.

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[github-actions]

GitHub MCP Testing: ❌
GitHub.com Connectivity: ✅
File Write/Read Test: ✅
BYOK Inference Test: ✅

Running in direct BYOK mode (AWF_AUTH_TYPE=github-oidc + AWF_AUTH_AZURE_* + COPILOT_PROVIDER_BASE_URL) via api-proxy → Azure OpenAI (Foundry, o4-mini-aw) authenticated via Microsoft Entra

Overall: FAIL

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🪪 BYOK (AOAI Entra) report filed by Smoke Copilot BYOK AOAI (Entra)
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Smoke Test: API Proxy OpenTelemetry Tracing

• ✅ Module Loading: otel.js loads cleanly, exports startRequestSpan, setTokenAttributes, setBudgetAttributes, endSpan, endSpanError, shutdown, isEnabled, plus internal helpers (_ProxyAwareOtlpExporter, _FanOutSpanExporter, _FileSpanExporter, etc.)
• ✅ Test Suite: otel.test.js, otel-fanout.test.js, otel-workload-identity.test.js — 68/68 tests passed (3/3 suites)
• ✅ Env Var Forwarding: env-passthrough.ts forwards GITHUB_AW_OTEL_TRACE_ID/GITHUB_AW_OTEL_PARENT_SPAN_ID (+ COPILOT_OTEL_FILE_EXPORTER_PATH) into the agent container; api-proxy-env-config.ts's buildOtelEnv() forwards GH_AW_OTLP_ENDPOINTS, OTEL_EXPORTER_OTLP_ENDPOINT/HEADERS, trace/parent-span IDs, workload identity, and OTEL_SERVICE_NAME into the api-proxy container
• ✅ Token Tracker Integration: onUsage callback present in token-tracker-http.js (invoked after normalized usage extraction) as the documented OTEL hook point
• ⚠️ OTEL Diagnostics: No live diagnostics artifact/step-summary was available in this run context to confirm actual span export; static/unit validation above passed fully

Overall: PASS — all verifiable scenarios (1–4) succeeded; scenario 5 pending live run data.

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🏗️ Build Test Suite Results

Ecosystem	Project	Build/Install	Tests	Status
Bun	elysia	✅	1/1 passed	✅ PASS
Bun	hono	✅	1/1 passed	✅ PASS
C++	fmt	✅	N/A	✅ PASS
C++	json	✅	N/A	✅ PASS
Deno	oak	N/A	1/1 passed	✅ PASS
Deno	std	N/A	1/1 passed	✅ PASS
.NET	hello-world	✅	N/A (ran, printed "Hello, World!")	✅ PASS
.NET	json-parse	✅	N/A (ran, printed expected JSON output)	✅ PASS
Go	color	✅	ok	✅ PASS
Go	env	✅	ok	✅ PASS
Go	uuid	✅	ok	✅ PASS
Java	gson	✅	1/1 passed	✅ PASS
Java	caffeine	✅	1/1 passed	✅ PASS
Node.js	clsx	✅	all passed	✅ PASS
Node.js	execa	✅	all passed	✅ PASS
Node.js	p-limit	✅	all passed	✅ PASS
Rust	fd	✅	1/1 passed	✅ PASS
Rust	zoxide	✅	1/1 passed	✅ PASS

Overall: 8/8 ecosystems passed — ✅ PASS

Note: Java's default mvn local repository (~/.m2/repository) was not writable in this sandbox (owned by root), causing an initial LocalRepositoryNotAccessibleException. Retried with -Dmaven.repo.local=<writable-dir> (proxy settings from ~/.m2/settings.xml unaffected), after which both gson and caffeine compiled and tested successfully. This is an environment/permissions quirk unrelated to the AWF firewall itself.

All other ecosystems (Bun, C++, Deno, .NET, Go, Node.js, Rust) built/tested cleanly with no proxy or network issues.

Generated by Build Test Suite for #7700 · auto · 83.4 AIC · ⊞ 12K · ◷
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