fix persisted unit failure identity

src/lib/compiler.cpp

@@ -38,6 +38,7 @@ struct SharedUnitFilesystemState
 	String compile_output_content;
 	String metadata_build_token;
 	String metadata_input_signature;
+	String metadata_source_path;
 	String current_input_signature;
 };
 
@@ -222,6 +223,7 @@ String compiler_unit_metadata_text(Request* context, SharedUnit* su, String inpu
 	return(
 		"format=uce-unit-metadata-v1\n"
 		"unit_abi_version=" + std::to_string(UCE_UNIT_ABI_VERSION) + "\n"
+		"source_path=" + su->file_name + "\n"
 		"input_signature=" + input_signature + "\n"
 		"build_token=" + compiler_unit_build_token() + "\n"
 	);
@@ -275,6 +277,8 @@ bool compiler_failure_retry_deferred(Request* context, SharedUnit* su, const Sha
 		return(false);
 	if(!state.metadata_exists || !state.metadata_parsed || !state.abi_compatible || !state.input_signature_matches)
 		return(false);
+	if(state.metadata_source_path == "" || state.metadata_source_path != su->file_name)
+		return(false);
 	auto required_failure_inputs_time = std::max({
 		state.source_time,
 		state.setup_template_time,
@@ -374,6 +378,9 @@ String compiler_normalize_unit_path(Request* context, String file_name)
 		return("");
 	if(file_name[0] != '/')
 		file_name = expand_path(file_name, context->server->config["COMPILER_SYS_PATH"]);
+	String canonical = path_real(file_name);
+	if(canonical != "")
+		return(canonical);
 	return(file_name);
 }
 
@@ -474,6 +481,9 @@ SharedUnitFilesystemState inspect_shared_unit_filesystem(Request* context, Share
 		auto input_it = metadata.find("input_signature");
 		if(input_it != metadata.end())
 			state.metadata_input_signature = input_it->second;
+		auto source_it = metadata.find("source_path");
+		if(source_it != metadata.end())
+			state.metadata_source_path = source_it->second;
 		auto build_it = metadata.find("build_token");
 		if(build_it != metadata.end())
 			state.metadata_build_token = build_it->second;