flush runtime diagnostics promptly

scripts/run_cli_tests.sh

@@ -69,4 +69,5 @@ if [[ "$action" == "run" ]]; then
 	scripts/test_dependency_invalidation.sh
 	scripts/test_cold_component_deadline.sh
 	scripts/test_password_hashing.sh
+	scripts/test_log_timeliness.sh
 fi

scripts/test_log_timeliness.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+test_name="log-timeliness-test-$$"
+site_directory="${UCE_TEST_SITE_DIRECTORY:-site}"
+if [[ -z "${UCE_TEST_SITE_DIRECTORY:-}" && -r /etc/uce/settings.cfg ]]; then
+	configured_site_directory=$(awk -F= '/^[[:space:]]*SITE_DIRECTORY[[:space:]]*=/ {gsub(/^[[:space:]]+|[[:space:]]+$/, "", $2); print $2; exit}' /etc/uce/settings.cfg)
+	if [[ -n "${configured_site_directory:-}" ]]; then
+		site_directory="$configured_site_directory"
+	fi
+fi
+source_dir="$site_directory/$test_name"
+bin_directory="${BIN_DIRECTORY:-}"
+if [[ -z "$bin_directory" && -r /etc/uce/settings.cfg ]]; then
+	bin_directory=$(awk -F= '/^[[:space:]]*BIN_DIRECTORY[[:space:]]*=/ {gsub(/^[[:space:]]+|[[:space:]]+$/, "", $2); print $2; exit}' /etc/uce/settings.cfg)
+fi
+bin_directory="${bin_directory:-/tmp/uce/work}"
+cache_dir=""
+
+cleanup() {
+	rm -rf "$source_dir"
+	if [[ -n "$cache_dir" ]]; then
+		rm -rf "$cache_dir"
+	fi
+}
+trap cleanup EXIT
+mkdir -p "$source_dir"
+cache_dir="$bin_directory$(realpath "$source_dir")"
+
+printf '%s\n' 'CLI(Request& context) { deliberate_log_timeliness_compile_failure }' >"$source_dir/probe.uce"
+rm -rf "$cache_dir"
+started_at=$(date '+%Y-%m-%d %H:%M:%S')
+
+set +e
+scripts/uce-cli "/$test_name/probe.uce" >/dev/null 2>&1
+set -e
+
+for _ in $(seq 1 20); do
+	if journalctl -u uce --since "$started_at" --no-pager | grep -Fq "$test_name/probe.uce"; then
+		echo "log timeliness passed"
+		exit 0
+	fi
+	sleep 0.1
+done
+
+echo "compile diagnostic was not journaled promptly: $test_name/probe.uce" >&2
+exit 1