Cache loaded source signatures safely

scripts/test_dependency_invalidation.sh

@@ -3,14 +3,24 @@ set -euo pipefail
 cd "$(dirname "$0")/.."
 
 test_name="dependency-cache-test-$$"
-source_dir="site/$test_name"
-cache_dir="${BIN_DIRECTORY:-/tmp/uce/work}$(pwd)/$source_dir"
+site_directory="${UCE_TEST_SITE_DIRECTORY:-site}"
+source_dir="$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 "$source_dir" "$cache_dir"
+	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' \
 	'#ifndef UCE_DEPENDENCY_CACHE_CHILD' \