pr-merge --base-line: gated intra-line exception (B5) (#1471)

Co-authored-by: marcie <[email protected]>
2026-08-29 18:14:40 +00:00
parent ed4c543872
commit 09d24b9275
3 changed files with 93 additions and 4 deletions
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+# B5 (ruled 2026-08-29, orch-01-adopted): pr-merge --base-line — the
+# documented intra-line exception. Arms:
+#   1. Base neither main nor next, no flag: policy refusal (rc 1), queue
+#      guard NOT invoked, hint names the exception.
+#   2. Base neither main nor next, matching --base-line: authorized; the
+#      queue guard IS invoked with the same args (rc from the stub proves
+#      gates still run) and the audit line is emitted.
+#   3. Mismatched --base-line (different branch than the PR base): refusal
+#      rc 1 with the mismatch named; queue guard NOT invoked.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+WORK_DIR="${MOSAIC_TEST_WORK_DIR:-$PWD/.mosaic-test-work/pr-merge-baseline}"
+FIXTURE_DIR="$WORK_DIR/tools/git"
+CALL_LOG="$WORK_DIR/queue-call.log"
+OUT_LOG="$WORK_DIR/out.log"
+
+rm -rf "$WORK_DIR"
+mkdir -p "$FIXTURE_DIR"
+cp "$SCRIPT_DIR/pr-merge.sh" "$FIXTURE_DIR/pr-merge.sh"
+cp "$SCRIPT_DIR/detect-platform.sh" "$FIXTURE_DIR/detect-platform.sh"
+
+cat > "$FIXTURE_DIR/pr-metadata.sh" <<'SH'
+#!/usr/bin/env bash
+printf '%s\n' '{"baseRefName":"mosaic-cli-p0","baseRepository":"mosaicstack/stack","headRefName":"mosaic-cli-p2-socket-res","headRefOid":"0123456789abcdef0123456789abcdef01234567","headRepository":"mosaicstack/stack"}'
+SH
+
+cat > "$FIXTURE_DIR/ci-queue-wait.sh" <<'SH'
+#!/usr/bin/env bash
+printf '%s\n' "$*" > "${MOSAIC_QUEUE_CALL_LOG:?}"
+exit 42
+SH
+chmod +x "$FIXTURE_DIR"/*.sh
+
+run_case() { # run_case <extra-args...>
+    : > "$CALL_LOG"
+    set +e
+    (
+        cd "$WORK_DIR"
+        export MOSAIC_QUEUE_CALL_LOG="$CALL_LOG"
+        "$FIXTURE_DIR/pr-merge.sh" -n 123 "$@"
+    ) >"$OUT_LOG" 2>&1
+    rc=$?
+    set -e
+}
+
+# 1. No flag: policy refusal, no gate invocation.
+run_case
+[[ "$rc" -eq 1 ]] || { echo "FAIL arm1: rc=$rc want 1" >&2; cat "$OUT_LOG" >&2; exit 1; }
+[[ ! -s "$CALL_LOG" ]] || { echo "FAIL arm1: queue guard ran without authorization" >&2; exit 1; }
+grep -q "only for PRs targeting" "$OUT_LOG" || { echo "FAIL arm1: policy message missing" >&2; exit 1; }
+grep -q -- "--base-line 'mosaic-cli-p0'" "$OUT_LOG" || { echo "FAIL arm1: hint missing" >&2; exit 1; }
+
+# 2. Matching flag: authorized, audit line emitted, gates RUN (stub rc 42).
+run_case --base-line mosaic-cli-p0
+[[ "$rc" -eq 42 ]] || { echo "FAIL arm2: rc=$rc want 42 (gate stub rc must propagate)" >&2; cat "$OUT_LOG" >&2; exit 1; }
+[[ -s "$CALL_LOG" ]] || { echo "FAIL arm2: queue guard NOT invoked despite authorization" >&2; exit 1; }
+grep -q -- '-B mosaic-cli-p2-socket-res' "$CALL_LOG" || { echo "FAIL arm2: guard args wrong" >&2; cat "$CALL_LOG" >&2; exit 1; }
+grep -q "base-line exception" "$OUT_LOG" || { echo "FAIL arm2: audit line missing" >&2; exit 1; }
+
+# 3. Mismatched flag: refusal, mismatch named, no gate invocation.
+run_case --base-line some-other-line
+[[ "$rc" -eq 1 ]] || { echo "FAIL arm3: rc=$rc want 1" >&2; cat "$OUT_LOG" >&2; exit 1; }
+[[ ! -s "$CALL_LOG" ]] || { echo "FAIL arm3: queue guard ran on a refused merge" >&2; exit 1; }
+grep -q "does not match the PR base" "$OUT_LOG" || { echo "FAIL arm3: mismatch message missing" >&2; exit 1; }
+
+echo "pr-merge --base-line exception regression passed (B5)"