complexity-reduction 3/4: microvm-coverage tooling + self-test checks (M1–M6)#26
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Add a -coverage-out flag to the aggregator that regenerates the
coverage-func.out + coverage-per-package.tsv artifacts inside rawDir
from a supplied Go coverage profile, before ingestCoverage runs.
The update-quality-report wrapper will use this to feed a merged host
+ microvm coverage profile back through the aggregator without
rebuilding the entire Nix derivation.
regenerateCoverageArtifacts(rawDir, profile)
1. go tool cover -func=<profile> → <rawDir>/coverage-func.out
2. buildPerPackageTSV — pure-Go port of the awk in
nix/quality-report/default.nix; dedupes atomic-mode block
repetitions by max-count and aggregates per package directory.
New tests (ratchet_test.go):
TestBuildPerPackageTSV_table — 5 rows covering atomic-dedup,
non-module-line filtering, empty profile, zero-statement blocks
TestRegenerateCoverageArtifacts_writesFiles — verifies both
artifacts land in rawDir (skips if go tool cover unavailable)
TestRegenerateCoverageArtifacts_missingProfileErrs
Extend the shell wrapper with an optional --with-microvm flag:
1. Boot the coverage-instrumented microvm via
`nix run .#microvm-x86_64-lifecycle-coverage` and scrape the
Go coverage data dump from its serial console into a tempdir.
2. Build the regular .#quality-report (host coverage in raw/).
3. Merge VM dir + host coverage.out via .#coverage-merge.
4. Copy the read-only Nix-store raw/ into a writable temp dir, then
re-run the quality-report aggregator with the new -coverage-out
flag pointing at the merged profile.
5. Overwrite docs/quality-report.md with the merged-numbers report.
Without --with-microvm, behaviour is unchanged: a single Nix build,
copy the markdown.
Falls back gracefully:
- If the microvm lifecycle scrapes zero coverage files (KVM
unavailable, VM crashed, etc.) we WARN + fall back to host-only.
- Adds versions.go to runtimeInputs so the aggregator re-run has
Go on PATH (regenerateCoverageArtifacts shells to `go tool
cover -func`).
Microvm coverage merge wired into update-quality-report --with-microvm: cmd/xtcp2 92.4% → 95.9% (daemon runDaemon now exercised in VM) pkg/xtcp 85.2% → 87.1% (netlink/ns paths under real kernel) pkg/xtcpnl 91.4% → 91.8% Overall 90.3% → 91.1% The lifecycle test exited non-zero (one self-test check failed) so only 2 coverage files were scraped. Adding the iouring-flavor VM merge in a follow-up will pick up more io_uring paths.
Extend coverage-merge.nix to accept multiple --vm-dir flags
(concatenated via covdata textfmt's comma-separated -i). Extend
update-quality-report --with-microvm to run BOTH coverage VMs
sequentially:
1. .#microvm-x86_64-lifecycle-coverage (stdlib build) — exercises
the syscall netlinker + namespace/ns_watch paths
2. .#microvm-x86_64-lifecycle-coverage-iouring (iouring build) —
exercises netlinker_iouring + io_uring.Ring paths that the
stdlib VM can't reach (different build tag)
The merge picks up every block covered by either VM, then the
existing host+VM merge in coverage-merge.nix takes the union of
host coverage and the combined VM coverage.
Falls back gracefully:
- If either VM scrapes zero files, that --vm-dir is skipped.
- If BOTH scrape zero, we WARN + fall back to host-only (same
behaviour as before this commit, just lifted to the two-VM
aggregate check).
…elete)
Add two new checks to nix/microvms/self-test.nix that exercise xtcp2's
namespace-watching pipeline end-to-end inside the coverage VM:
Check 8 (NS_LIFECYCLE):
ip netns add xtcp_test_ns_a → fsnotify Create
→ watchNsNamespace dispatchNsFsEvent
→ nsAdd
→ netNamespaceInstance
→ openAndSetNSWithRetries (real
Open + Setns syscalls)
→ syscall.Socket(AF_NETLINK) + Bind
→ createNetlinkersAndStore
→ spawns a per-ns netlinker goroutine
ip netns delete → fsnotify Remove → nsDelete teardown
Check 9 (NS_TRAFFIC):
Same as above, but ALSO creates a TCP listener + client pair
inside the new ns. The per-ns netlinker polls inet_diag in that
ns; the daemon's Netlinker.packets counter bumps. This drives
the full netlinkerSyscall body — Recvfrom on a real netlink fd,
Deserialize on real (not garbage) netlink bytes, every per-
attribute deserializer that finds a present attribute.
Assertions read xtcp_counts metric vector via curl /metrics
(function="watchNamespaces" event-counter; function=
"netNamespaceInstance" start-counter; function="Netlinker"
packets-counter).
Both checks fall back gracefully if iproute2/nc are missing on
PATH; iproute2 is already in self-test runtimeInputs.
nix/microvms/default.nix: extend the coverage + coverage-iouring
lifecycle sentinelRe so the new sentinels surface in the harness
output (default filter hid them).
The metric_value awk filter was matching on task="…" but the actual label key in pkg/xtcp/prometheus.go is variable="…". With the wrong key both before/after queries returned 0, masking whether netNamespaceInstance actually started. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Check 8 NS_LIFECYCLE failed silently (evt:0→0→0); add /run/netns listing, ip-netns-add stderr capture, and per-call metric-row dumps so the next run reveals whether fsnotify saw the create. Check 9 NS_TRAFFIC now matches both Netlinker and NetlinkerIoUring packet counters so it works in both coverage VM flavors. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
ls is fine for a single-call diagnostic dump in the self-test where shellcheck's SC2012 (prefer find) adds no value. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The previous filter passed 'function="X",variable="Y"' as a single substring, but Prometheus prints labels in alphabetical order (function, type, variable), so type="..." sits between them and the substring never matched. Counters always returned 0. Switch metric_value to two separate substring args (function + variable) that are both required to be present in a row. Drop the verbose diagnostic dumps now that the root cause is identified. After this fix: XTCP2_SELF_TEST_NS_LIFECYCLE_PASS (evt:0→1→2 inst:1→2) XTCP2_SELF_TEST_NS_TRAFFIC_PASS (Netlinker.packets:20→36) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- tools/quality-report/main.go:381 exec.Command → exec.CommandContext
with a 30s timeout so the cover -func step can be cancelled cleanly.
- tools/quality-report/main.go:414 remove unused blockKey struct
(leftover from an earlier per-block dedupe approach that lives now in
seenStmt/seenMaxCount maps).
- pkg/xtcpnl/xtcpnl_fatalf_test.go:95 drop int64(tv.Usec) — Timeval.Usec
is already int64 on linux/amd64.
- pkg/xtcp/destinations_{kafka,valkey}_test.go gofmt struct-field alignment.
- docs/quality-report.md regenerated with NS_LIFECYCLE + NS_TRAFFIC
passing in both coverage VMs (evt:0→1→2 inst:1→2,
Netlinker.packets:20→36).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The production adapter showed 0% coverage even with the dest_valkey build tag because every other test bypassed it via the newValkeyClientFn factory seam. Drive each adapter method against an unreachable port with a short-deadline context so Publish + Ping surface dial errors and Close is exercised cleanly. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
xtcp2's netNsCandidateDirs probes /run/netns/ AND /run/docker/netns/. The coverage VM only pre-created the first, so the daemon's second watchNsNamespace goroutine (for the docker path) never spawned and that whole branch read 0% coverage. Pre-create /run/docker/netns/ via systemd.tmpfiles in coverage VMs and add Check 10: ip-netns-add → mount --bind into /run/docker/netns/ to fire fsnotify Create on the docker dir. Mirrors what docker actually does at the filesystem level when spawning a container — no docker daemon required. Result (stdlib coverage VM): XTCP2_SELF_TEST_NS_DOCKER_PASS (evt:4→5→6 inst:3→4) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Adds NS_DOCKER_PASS in both coverage VMs (evt:4→5→6 inst:3→4), confirming the /run/docker/netns/ watch path is now exercised end-to-end. The redisClientAdapter Publish/Ping/Close tests also landed — valkey production adapter went from 0% to 100% and dropped off the gaps list. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Two latent bugs that had Check 3 + 5 failing in every flavor since the
self-test was first introduced:
1. cmd/xtcp2client default port was 8888, but the daemon listens on
8889 (cmd/xtcp2 grpcPortCst). Every gRPC roundtrip from xtcp2client
to a default daemon was a silent connection refused. Bump the
client's default to 8889 to match, and add an explicit -port flag
so this footgun is at least configurable. Pinned the constant with
a CLAUDE comment about keeping the two in lockstep.
2. Self-test Check 3 grep'd /var/log/xtcp2.jsonl, but xtcp2 has no
file destination type — vmConfig.json's "type":"file" is
aspirational, never wired into RegisterDestination. The file
literally never existed. Rewrote Check 3 as a metric-driven
assertion: poll xtcp_counts{variable="p"} until ANY Netlinker has
parsed at least one inet_diag socket (which is the only end-to-end
signal Check 3 was ever trying to verify).
3. Self-test Check 5 invoked xtcp2client with `-addr host:port` but
the flag set is `-target host` + `-port num` (now exists). Updated.
Result (stdlib coverage VM):
XTCP2_SELF_TEST_NETLINK_PASS (Netlinker parsed 3 sockets via inet_diag)
XTCP2_SELF_TEST_GRPC_ROUNDTRIP_PASS (xtcp2client rc=124, produced output)
XTCP2_SELF_TEST_OVERALL_PASS
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The syscall netlinker increments xtcp_counts{function="Netlinker",
variable="p",type="count"} by the number of inet_diag sockets parsed
per recv (netlinker.go:194), but the io_uring path discarded
Deserialize's first return. Effect: dashboards + the self-test never
saw iouring-flavor inet_diag activity reflected in the parsed-socket
metric — the counter just stayed at 0 even while NetlinkerIoUring.packets
was bumping each cycle.
Capture the count and emit the symmetric counter so iouring runs are
observable on the same dashboards as syscall runs.
Result: iouring coverage VM now hits NETLINK_PASS + OVERALL_PASS.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
After fixing the xtcp2client port mismatch (Check 5), the file-sink mirage in Check 3, and the NetlinkerIoUring missing-p-counter bug, both stdlib and iouring coverage VMs now hit OVERALL_PASS — all 10 self-test checks green: SYSTEMD METRICS NETLINK BINARIES_HELP GRPC_ROUNDTRIP NS_INSPECT NSTEST NS_LIFECYCLE NS_TRAFFIC NS_DOCKER Total coverage 91.9%. pkg/xtcp 89.4%. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
…g test - destinations_kafka.go: delete registerProtobufSchemaRestful which was marked lint:ignore U1000 "historical reference; not called". The whole function (35 lines, 13 stmts) was dragging pkg/xtcp's coverage divisor without ever being exercised. The "bytes" import was only used in this dead code; remove that too. - destinations_kafka_test.go: add TestNewKafkaDest_debugLog to cover the 5 log.Println calls inside the `if x.debugLevel > 10` block that newKafkaDest's happy-path test skips. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
SA9003 (empty branch) was flagged inside an `if r := recover(); r != nil`
block in poller_helpers_test.go. The intent is to swallow the panic
deliberately — collapse to `defer func() { _ = recover() }()` so the
recover stays explicit but the empty-branch warning is gone.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Final state after the M5/M6/check-fix arc: Total findings: 0 Total coverage: 92.4% pkg/xtcp: 90.8% (was 89.4% — cleared the below-90pct finding) Coverage VMs: XTCP2_SELF_TEST_OVERALL_PASS (stdlib + iouring) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
complexity-reduction 3/4 — cluster B2: microvm-coverage tooling + self-test checks (commits 43–63). Applied cleanly onto main.
quality-report -coverage-out+ per-package TSV regen,update-quality-report --with-microvmwiring, merge of the iouring VM coverage, and self-test checks that drive ns-lifecycle / TCP-in-ns //run/docker/netnswatch paths so those code paths are actually covered.OVERALL_PASS.NetlinkerIoUringparsed-socket count counter; coverredisClientAdapterPublish/Ping/Close; delete deadregisterProtobufSchemaRestful+ add anewKafkaDestdebug-log test; SA9003 / noctx / unused / unconvert lint cleanup.Lands on
docs: refresh report — 0 findings, 92.4% coverage, all checks green.Testing
go vet ./...+gofmt -l .— clean (go 1.25; no gofmt-forward needed this batch).go test -ldflags=-checklinkname=0 -tags 'dest_kafka dest_nats dest_nsq dest_valkey' ./...— entire suite green.Note: the M-series wiring targets coverage produced by the coverage microVMs; the in-VM runs themselves aren't executed here (KVM/heavy) — the Go + tooling changes are verified by build/vet/test.
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