Process: test exec(3) = E2BIG handling

test/CMakeLists.txt

@@ -14,6 +14,7 @@ set(base_test_SOURCES
   base-netstring.cpp
   base-object.cpp
   base-object-packer.cpp
+  base-process.cpp
   base-serialize.cpp
   base-shellescape.cpp
   base-stacktrace.cpp
@@ -87,6 +88,7 @@ add_boost_test(base
     base_netstring/netstring
     base_object/construct
     base_object/getself
+    base_process/e2big
     base_serialize/scalar
     base_serialize/array
     base_serialize/dictionary

test/base-process.cpp

@@ -0,0 +1,35 @@
+/* Icinga 2 | (c) 2023 Icinga GmbH | GPLv2+ */
+
+#include "base/process.hpp"
+#include <BoostTestTargetConfig.h>
+
+using namespace icinga;
+
+BOOST_AUTO_TEST_SUITE(base_process)
+
+BOOST_AUTO_TEST_CASE(e2big)
+{
+#ifndef _WIN32
+	String placeHolder = "x";
+
+	for (int i = 0; i < 23; ++i) {
+		placeHolder += placeHolder; // 2^23 = 8388608 > ARG_MAX
+	}
+
+	Process::Ptr p = new Process(
+		{"echo", "truncated_" + placeHolder + "Y", "untouched"},
+		nullptr,
+		{"_" + placeHolder + "Y"}
+	);
+
+	p->SetTimeout(60 * 60);
+	p->Run();
+
+	auto& out (p->WaitForResult().Output);
+
+	BOOST_CHECK(out.Contains("truncated"));
+	BOOST_CHECK(out.Contains("x untouched"));
+#endif /* _WIN32 */
+}
+
+BOOST_AUTO_TEST_SUITE_END()