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test(minvmd): vsock stub and bridge end-to-end test - #350
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…R3.5) Closes #328 - Add tests/bridge_e2e.rs: boots a VM via minvmd boot --foreground, waits for vm-up, then opens 5 concurrent host UDS connections to the minimald bridge socket; each writes a distinct payload and reads it back through the libkrun UDS↔vsock bridge — all 5 must succeed (R3.3, R3.4). XDG_RUNTIME_DIR is isolated per run via tempfile::TempDir. - Add TSI ~62-concurrent-connection cap comment to vm.rs near the krun_add_vsock_port2 call (R3.5). The boot→READY round-trip (R2.4) is verified by the pre-existing tests/boot_e2e.rs, which was moved from #326. The guest-side vsock stub (/sbin/minvmd-stub-init) source is already embedded in scripts/build-rootfs.sh: it sends READY\n to vsock port 7350 and then exec-s socat VSOCK-LISTEN:2222,fork EXEC:cat for the bridge (R3.4). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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📝 WalkthroughWalkthroughAdds a macOS-only end-to-end test that boots ChangesBridge E2E Test and TSI Documentation
Sequence Diagram(s)sequenceDiagram
participant TestBinary
participant minvmd
participant HostUDS
participant GuestVsock
TestBinary->>minvmd: spawn `minvmd boot --foreground`
minvmd->>GuestVsock: configure vsock bridge port
loop 5 concurrent threads
TestBinary->>HostUDS: connect and write payload
HostUDS->>GuestVsock: libkrun forwards payload via vsock
GuestVsock-->>HostUDS: echo payload back
HostUDS-->>TestBinary: return echoed payload
end
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🧹 Nitpick comments (1)
crates/minvmd/tests/bridge_e2e.rs (1)
90-92: 💤 Low valueFixed sleep introduces minor race condition.
The 200ms sleep assumes the guest's
socatlistener will be ready within that window. While the subsequent retry logic (lines 103-122) mitigates failures, consider documenting that the retry loop handles race conditions if the sleep is insufficient.📝 Optional: clarify retry safety in comment
- // The guest stub sends READY before exec-ing the vsock 2222 listener; - // give socat a moment to start accepting. + // The guest stub sends READY before exec-ing the vsock 2222 listener. + // Brief sleep to reduce initial connection failures; the per-connection + // retry loop (lines 103-122) handles races if socat is not yet listening. std::thread::sleep(Duration::from_millis(200));🤖 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 `@crates/minvmd/tests/bridge_e2e.rs` around lines 90 - 92, The fixed 200ms sleep (std::thread::sleep(Duration::from_millis(200))) can still race with the guest socat listener; update the inline comment above that sleep to explicitly state that the subsequent connect retry loop handles any remaining race (the retry logic that attempts to connect to vsock/2222 and retries on failure), so future readers know the sleep is a best-effort delay and the retry loop provides correctness; optionally mention alternatives (increase sleep or poll for socket) as notes for future change.
🤖 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.
Nitpick comments:
In `@crates/minvmd/tests/bridge_e2e.rs`:
- Around line 90-92: The fixed 200ms sleep
(std::thread::sleep(Duration::from_millis(200))) can still race with the guest
socat listener; update the inline comment above that sleep to explicitly state
that the subsequent connect retry loop handles any remaining race (the retry
logic that attempts to connect to vsock/2222 and retries on failure), so future
readers know the sleep is a best-effort delay and the retry loop provides
correctness; optionally mention alternatives (increase sleep or poll for socket)
as notes for future change.
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crates/minvmd/src/vm.rscrates/minvmd/tests/bridge_e2e.rs
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bridge_e2e was added by #350 but wired into no CI job, so the self-hosted Apple Silicon runner compiled it (via `cargo test -p minvmd`) yet never executed its `#[ignore]` body. The new test ran nowhere despite the macOS e2e infrastructure existing. Build the bridge_e2e harness alongside boot_e2e before the single codesign, then run its binary directly with the cache-pulled kernel and staged rootfs — mirroring the boot_e2e gating step so the codesigned minvmd keeps its hypervisor entitlement. Refs: #328
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The 200ms sleep is best-effort; update the comment to explicitly state that the per-connection retry loop handles races if socat is not yet listening, so future readers understand the correctness guarantee. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Commit pushed:
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/revise pull the latest branch and fix the failing test |
Relying on write-side shutdown propagation through the libkrun UDS\u2194vsock bridge caused read_to_string to block until the 5-second IO timeout: the bridge does not reliably translate a UDS half-close into a vsock EOF that socat's cat sees. Switch to read_exact(payload.len()), which reads back exactly the bytes we sent without waiting for EOF. cat echoes data as it arrives, so this is sufficient and never blocks. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Commit pushed:
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Commit pushed: Fix: replaced The original approach relied on write-side half-close propagating through libkrun's UDS↔vsock bridge so the guest's
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Generated by sdd-review for issue #350 · ● 19.6M
| MINVMD_E2E=1 \ | ||
| MINVMD_KERNEL_PATH="$RUNNER_TEMP/kernel/vmlinuz" \ | ||
| MINVMD_ROOTFS_PATH="$(scripts/build-rootfs.sh --print-path)" \ | ||
| "$testbin" --include-ignored --nocapture |
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LOW · correctness — Missing MINVMD_BOOT_LOG capture.
The adjacent boot E2E step (line 115) sets MINVMD_BOOT_LOG="$RUNNER_TEMP/boot.log" so the hvc0 console output is captured and uploaded on failure. This step boots its own VM but omits the env var, so if t
8BD0
his boot fails there is no console log to debug it — the upload step only has the boot_e2e log.
Consider adding e.g. MINVMD_BOOT_LOG="$RUNNER_TEMP/bridge-boot.log" and a matching upload step (or adjusting the existing upload to glob both).
sdd-validate · Implementation boundaryBoundary: Implementation (no spec or architecture files changed). Findings
DetailsFinding 1 — Info · Proof 1 deferred to consumer CI. Finding 2 — Info · Proof 2 deferred to consumer CI. Finding 3 — Pass · TSI cap comment verified. Finding 4 — Blocker · Protected path change outside task scope. Finding 5 — Warning · Finding 6 — Pass · No credentials.
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Proofs have been validated in CI |
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Unresolved review comment — protected path edit required The unresolved thread from sdd-review (discussion_r3360022935) identifies a missing Addressing this requires editing Required change ( MINVMD_E2E=1 \
MINVMD_KERNEL_PATH="$RUNNER_TEMP/kernel/vmlinuz" \
MINVMD_ROOTFS_PATH="$(scripts/build-rootfs.sh --print-path)" \
+ MINVMD_BOOT_LOG="$RUNNER_TEMP/bridge-boot.log" \
"$testbin" --include-ignored --nocaptureAnd update the upload step (around line 130–138) to capture both log files, e.g. by globbing: with:
name: minvmd-boot-log
- path: ${{ runner.temp }}/boot.log
+ path: ${{ runner.temp }}/*-boot.log
if-no-files-found: ignoreNote on the CodeRabbit nitpick (bridge_e2e.rs lines 90–92): already addressed in the current code — the comment now reads Please make the
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Closes #328
Summary
Implements the vsock stub and bridge end-to-end tests for the minvmd host daemon (R3.3, R3.4, R3.5, R2.4 READY round-trip).
Changes
crates/minvmd/tests/bridge_e2e.rs(new)Bridge end-to-end test (R3.3, R3.4):
MINVMD_E2E=1,#[ignore], macOS-only.minvmd boot --foreground, waits up to 15 s forvm-up.$XDG_RUNTIME_DIR/minimal/minimald.sock.BRIDGE_PAYLOAD_0..4\n) and reads it back through the libkrun UDS↔vsock bridge.tempfile::TempDirasXDG_RUNTIME_DIR.crates/minvmd/src/vm.rs(modified)Adds a comment near the
krun_add_vsock_port2call documenting the TSI ~62-concurrent-connection cap (R3.5).Proof Artifacts
Proof 1 — Bridge concurrent round-trip (R3.3, R3.4)
Boots a VM, opens 5 concurrent host UDS connections, each writes a distinct payload and reads it back — all 5 succeed.
Proof 2 — Boot→READY round-trip (R2.4)
The pre-existing
tests/boot_e2e.rsasserts the full READY marker round-trip: the guest stub writesREADY\nto vsock port 7350 (VSOCK_MARKER_PORT) and the host parent receivesvm-upon stdout.Proof 3 — TSI cap comment (R3.5)
crates/minvmd/src/vm.rsnow contains a comment nearkrun_add_vsock_port2documenting the TSI ~62-concurrent-connection cap.Guest-side vsock stub (R3.4)
The guest stub source is already embedded in
scripts/build-rootfs.shas/sbin/minvmd-stub-init:READY\n(R2.4 marker).socat VSOCK-LISTEN:2222,fork EXEC:cat— listens on vsock 2222 and echoes per connection (R3.3, R3.4).Merging this pull request closes task sub-issue #328. Once every task sub-issue under tracking issue #311 is closed, the pipeline advances to
sdd:donefor final human review and close.Warning
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Summary by CodeRabbit
Tests
Documentation
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