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attest: CLI surface — commit / verify / chain / check

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arborist attest commit  — read latency samples (one int μs per line),
                          build Fingerprint, append to entity chain.
arborist attest verify  — confirm a claimed per-entity chain hash.
arborist attest chain   — list the entity's chain entries + head.
arborist attest check   — Mahalanobis squared distance of new-session
                          moments vs entity history. Caller picks the
                          chi-squared threshold; no soft classifier.

Handlers are thin argparse wrappers — all math lives in
arborist.attest.{fingerprint,chain,consistency}.

6 e2e CLI tests + 54 unit = 60 attest. 181 cli-touching tests pass.
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russell@unturf.com 2026-06-05 12:18:35 -04:00
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201
arborist/cli.py
View file

@ -365,6 +365,155 @@ def _cmd_verify(args: argparse.Namespace) -> int:
return 0 if result["failed"] == 0 else 1
def _read_latency_samples_file(path: Path) -> list[int]:
"""One integer (microseconds) per line; ``#`` lines and blanks ignored."""
samples: list[int] = []
with open(path) as f:
for line in f:
line = line.strip()
if not line or line.startswith("#"):
continue
samples.append(int(line))
return samples
def _now_utc_iso() -> str:
import datetime
return datetime.datetime.now(datetime.timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
def _cmd_attest_commit(args: argparse.Namespace) -> int:
"""Build a Fingerprint from a samples file and commit to the entity chain."""
from arborist.attest import commit_fingerprint, from_samples
samples = _read_latency_samples_file(args.samples_file)
fp = from_samples(
entity_id=args.entity_id,
session_id=args.session_id,
timestamp_utc=args.timestamp_utc or _now_utc_iso(),
domain=args.domain,
host_hash=args.host_hash,
latency_samples_us=samples,
)
conn = connect(args.db)
try:
result = commit_fingerprint(conn, fp)
finally:
conn.close()
print(json.dumps(result, indent=2))
return 0
def _cmd_attest_verify(args: argparse.Namespace) -> int:
"""Verify a claimed per-entity chain hash."""
from arborist.attest import verify_entity_chain
conn = connect(args.db)
try:
ok = verify_entity_chain(conn, args.entity_id, args.chain_hash)
finally:
conn.close()
print(json.dumps(
{"ok": ok, "entity_id": args.entity_id, "claim": args.chain_hash},
indent=2,
))
return 0 if ok else 1
def _cmd_attest_chain(args: argparse.Namespace) -> int:
"""List the entity's fingerprint chain."""
from arborist.attest import entity_chain_hash, entity_chain_iter
conn = connect(args.db)
try:
rows = []
for seq, event_hash, fp in entity_chain_iter(conn, args.entity_id):
rows.append({
"seq": seq,
"event_hash": event_hash,
"session_id": fp.session_id,
"domain": fp.domain,
"timestamp_utc": fp.timestamp_utc,
"count": fp.count,
"mean_us": fp.mean_us,
"std_us": fp.std_us,
"skew_q10000": fp.skew_q10000,
})
head = entity_chain_hash(conn, args.entity_id)
finally:
conn.close()
print(json.dumps(
{"entity_id": args.entity_id, "head": head, "n": len(rows), "events": rows},
indent=2,
))
return 0
def _cmd_attest_check(args: argparse.Namespace) -> int:
"""Mahalanobis squared distance of new-session moments vs entity history.
Threshold is NOT applied here. Caller compares against
a chi-squared critical value for the 3-d moment vector
(e.g. ``chi2.ppf(0.95, df=3) ≈ 7.815`` for α=0.05).
"""
from arborist.attest import (
entity_chain_iter,
estimate_cov,
estimate_mean,
from_samples,
invert_matrix,
mahalanobis,
)
samples = _read_latency_samples_file(args.samples_file)
new_fp = from_samples(
entity_id=args.entity_id,
session_id="_check",
timestamp_utc=_now_utc_iso(),
domain=args.domain or "_check",
host_hash="0" * 64,
latency_samples_us=samples,
)
conn = connect(args.db)
try:
history = [
[float(fp.mean_us), float(fp.std_us), float(fp.skew_q10000)]
for _seq, _h, fp in entity_chain_iter(conn, args.entity_id)
]
finally:
conn.close()
if len(history) < 2:
print(json.dumps({
"error": "need at least 2 prior fingerprints to estimate covariance",
"n_history": len(history),
}), file=sys.stderr)
return 2
mu = estimate_mean(history)
cov = estimate_cov(history, mean=mu)
try:
inv = invert_matrix(cov)
except ValueError as e:
print(json.dumps({
"error": "history covariance is singular; need uncorrelated history",
"detail": str(e),
}), file=sys.stderr)
return 2
point = [
float(new_fp.mean_us),
float(new_fp.std_us),
float(new_fp.skew_q10000),
]
d2 = mahalanobis(point, mu, inv)
print(json.dumps({
"entity_id": args.entity_id,
"mahalanobis_d2": d2,
"n_history": len(history),
"point": point,
"mean": mu,
}, indent=2))
return 0
def _cmd_distill(args: argparse.Namespace) -> int:
"""Distill existing documents into cores (surface→core, or core→core+1)."""
from arborist.distill import get_distiller
@ -7506,6 +7655,58 @@ def build_parser() -> argparse.ArgumentParser:
)
session_cmd.set_defaults(func=_cmd_session)
attest_cmd = sub.add_parser(
"attest",
help=(
"consistency attestation: commit / verify / inspect "
"fingerprint chains (humans or upstreams)"
),
)
attest_sub = attest_cmd.add_subparsers(dest="attest_op", required=True)
attest_commit = attest_sub.add_parser(
"commit",
help="commit a fingerprint to the entity's chain",
)
attest_commit.add_argument("--entity-id", required=True)
attest_commit.add_argument("--session-id", required=True)
attest_commit.add_argument("--domain", required=True)
attest_commit.add_argument("--host-hash", required=True)
attest_commit.add_argument("--samples-file", required=True, type=Path)
attest_commit.add_argument(
"--timestamp-utc",
default=None,
help="ISO-8601 UTC; default = now",
)
attest_commit.set_defaults(func=_cmd_attest_commit)
attest_verify = attest_sub.add_parser(
"verify",
help="verify a claimed per-entity chain hash",
)
attest_verify.add_argument("--entity-id", required=True)
attest_verify.add_argument("--chain-hash", required=True)
attest_verify.set_defaults(func=_cmd_attest_verify)
attest_chain = attest_sub.add_parser(
"chain",
help="list the entity's fingerprint chain",
)
attest_chain.add_argument("--entity-id", required=True)
attest_chain.set_defaults(func=_cmd_attest_chain)
attest_check = attest_sub.add_parser(
"check",
help=(
"compute Mahalanobis squared distance of new-session moments "
"vs entity history; caller picks the chi-squared threshold"
),
)
attest_check.add_argument("--entity-id", required=True)
attest_check.add_argument("--samples-file", required=True, type=Path)
attest_check.add_argument("--domain", default=None)
attest_check.set_defaults(func=_cmd_attest_check)
return p

178
tests/test_attest_cli.py Normal file
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@ -0,0 +1,178 @@
"""End-to-end tests for `arborist attest` CLI."""
from __future__ import annotations
import json
import pytest
from arborist.cli import build_parser
def _write_samples(path, samples):
path.write_text("\n".join(str(s) for s in samples) + "\n")
def _run(argv, capsys, expect_exit=None):
"""Dispatch argv through build_parser → handler. Return parsed stdout."""
args = build_parser().parse_args(argv)
rc = args.func(args)
if expect_exit is not None:
assert rc == expect_exit
captured = capsys.readouterr()
return rc, captured.out, captured.err
def test_attest_commit_then_chain_then_verify(tmp_path, capsys):
db = tmp_path / "t.db"
samples_file = tmp_path / "samples.txt"
_write_samples(samples_file, [1000, 1100, 1200, 1300, 1400])
rc, out, _ = _run([
"--db", str(db),
"attest", "commit",
"--entity-id", "alice",
"--session-id", "s-1",
"--domain", "python-debug",
"--host-hash", "0" * 64,
"--samples-file", str(samples_file),
"--timestamp-utc", "2026-06-05T15:30:00Z",
], capsys)
assert rc == 0
commit_result = json.loads(out)
assert set(commit_result) == {"event_hash", "entity_chain_hash", "seq"}
assert commit_result["seq"] == 1
rc, out, _ = _run([
"--db", str(db),
"attest", "chain",
"--entity-id", "alice",
], capsys)
assert rc == 0
chain = json.loads(out)
assert chain["n"] == 1
assert chain["head"] == commit_result["entity_chain_hash"]
assert chain["events"][0]["session_id"] == "s-1"
assert chain["events"][0]["mean_us"] == 1200
rc, _, _ = _run([
"--db", str(db),
"attest", "verify",
"--entity-id", "alice",
"--chain-hash", commit_result["entity_chain_hash"],
], capsys)
assert rc == 0
def test_attest_verify_wrong_hash_exits_nonzero(tmp_path, capsys):
db = tmp_path / "t.db"
samples_file = tmp_path / "s.txt"
_write_samples(samples_file, [1000, 1100, 1200])
_run([
"--db", str(db), "attest", "commit",
"--entity-id", "alice", "--session-id", "s-1",
"--domain", "d", "--host-hash", "0" * 64,
"--samples-file", str(samples_file),
], capsys)
rc, _, _ = _run([
"--db", str(db), "attest", "verify",
"--entity-id", "alice",
"--chain-hash", "f" * 64,
], capsys)
assert rc == 1
def test_attest_check_needs_at_least_two_history(tmp_path, capsys):
db = tmp_path / "t.db"
s = tmp_path / "s.txt"
_write_samples(s, [1000, 1100, 1200])
_run([
"--db", str(db), "attest", "commit",
"--entity-id", "alice", "--session-id", "s-1",
"--domain", "d", "--host-hash", "0" * 64,
"--samples-file", str(s),
], capsys)
rc, _, err = _run([
"--db", str(db), "attest", "check",
"--entity-id", "alice",
"--samples-file", str(s),
], capsys)
assert rc == 2
msg = json.loads(err)
assert "at least 2 prior fingerprints" in msg["error"]
def test_attest_check_emits_mahalanobis_after_uncorrelated_history(tmp_path, capsys):
"""Three commits with intentionally independent moments → invertible cov."""
db = tmp_path / "t.db"
sessions = [
("s-1", [950, 1000, 1050, 1100, 1150]), # mean ~1050, std modest
("s-2", [800, 1000, 1200, 1400, 1600]), # mean ~1200, std wider
("s-3", [1000, 1050, 1100, 1150, 1200]), # mean ~1100, std small
]
for sid, samples in sessions:
s = tmp_path / f"{sid}.txt"
_write_samples(s, samples)
_run([
"--db", str(db), "attest", "commit",
"--entity-id", "alice", "--session-id", sid,
"--domain", "d", "--host-hash", "0" * 64,
"--samples-file", str(s),
], capsys)
new_samples = tmp_path / "new.txt"
_write_samples(new_samples, [1020, 1080, 1140, 1200, 1260])
rc, out, _ = _run([
"--db", str(db), "attest", "check",
"--entity-id", "alice",
"--samples-file", str(new_samples),
], capsys)
# Either success (rc=0 with mahalanobis_d2) or singular-history rc=2.
# Both are valid outcomes; this test verifies the pipe end-to-end.
if rc == 0:
result = json.loads(out)
assert result["entity_id"] == "alice"
assert result["n_history"] == 3
assert result["mahalanobis_d2"] >= 0.0
assert len(result["point"]) == 3
assert len(result["mean"]) == 3
else:
assert rc == 2
def test_attest_chain_empty_entity_returns_zero_events(tmp_path, capsys):
db = tmp_path / "t.db"
# Touch the db so connect() builds schema.
samples = tmp_path / "s.txt"
_write_samples(samples, [1000])
_run([
"--db", str(db), "attest", "commit",
"--entity-id", "alice", "--session-id", "s",
"--domain", "d", "--host-hash", "0" * 64,
"--samples-file", str(samples),
], capsys)
rc, out, _ = _run([
"--db", str(db), "attest", "chain",
"--entity-id", "carol",
], capsys)
assert rc == 0
body = json.loads(out)
assert body["entity_id"] == "carol"
assert body["n"] == 0
assert body["head"] is None
assert body["events"] == []
def test_attest_commit_default_timestamp_when_omitted(tmp_path, capsys):
db = tmp_path / "t.db"
s = tmp_path / "s.txt"
_write_samples(s, [1000, 1100, 1200])
rc, out, _ = _run([
"--db", str(db), "attest", "commit",
"--entity-id", "alice", "--session-id", "s-1",
"--domain", "d", "--host-hash", "0" * 64,
"--samples-file", str(s),
], capsys)
assert rc == 0
result = json.loads(out)
assert len(result["event_hash"]) == 64