Skip plugins list/load/tests for MUSL_OPTIMIZED_BUILD

When MUSL_OPTIMIZED_BUILD is specified, falco is statically linked under
musl, and can't dlopen() files: see
https://inbox.vuxu.org/musl/20200423162406.GV11469@brightrain.aerifal.cx/T/

So skip listing/loading/testing plugins when MUSL_OPTIMIZED_BUILD is specified.

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

.circleci/config.yml

@@ -292,6 +292,7 @@ jobs:
           BUILD_DIR: "/build-static"
           BUILD_TYPE: "release"
           SKIP_PACKAGES_TESTS: "true"
+          SKIP_PLUGINS_TESTS: "true"
     steps:
       - setup_remote_docker
       - attach_workspace:

test/run_regression_tests.sh

@@ -20,6 +20,7 @@ set -euo pipefail
 SCRIPT=$(readlink -f $0)
 SCRIPTDIR=$(dirname "$SCRIPT")
 SKIP_PACKAGES_TESTS=${SKIP_PACKAGES_TESTS:-false}
+SKIP_PLUGINS_TESTS=${SKIP_PLUGINS_TESTS:-false}
 TRACE_FILES_BASE_URL=${TRACE_FILES_BASE_URL:-"https://download.falco.org/fixtures/trace-files/"}
 
 # Trace file tarballs are now versioned. Any time a substantial change
@@ -99,12 +100,16 @@ function run_tests() {
     # as we're watching the return status when running avocado.
     set +e
     TEST_RC=0
-    suites=($SCRIPTDIR/falco_traces.yaml $SCRIPTDIR/falco_tests.yaml $SCRIPTDIR/falco_k8s_audit_tests.yaml $SCRIPTDIR/falco_tests_psp.yaml $SCRIPTDIR/falco_tests_exceptions.yaml $SCRIPTDIR/falco_tests_plugins.yaml)
+    suites=($SCRIPTDIR/falco_traces.yaml $SCRIPTDIR/falco_tests.yaml $SCRIPTDIR/falco_k8s_audit_tests.yaml $SCRIPTDIR/falco_tests_psp.yaml $SCRIPTDIR/falco_tests_exceptions.yaml)
 
     if [ "$SKIP_PACKAGES_TESTS" = false ] ; then
         suites+=($SCRIPTDIR/falco_tests_package.yaml)
     fi
 
+    if [ "$SKIP_PLUGINS_TESTS" = false ] ; then
+        suites+=($SCRIPTDIR/falco_tests_plugins.yaml)
+    fi
+    
     XUNIT_DIR="${OPT_BUILD_DIR}/integration-tests-xunit"
     mkdir -p "${XUNIT_DIR}"
 

userspace/falco/falco.cpp

@@ -137,8 +137,8 @@ static void usage()
 	   " -l <rule>                     Show the name and description of the rule with name <rule> and exit.\n"
 	   " --list [<source>]             List all defined fields. If <source> is provided, only list those fields for\n"
 	   "                               the source <source>. Current values for <source> are \"syscall\", \"k8s_audit\"\n"
+#ifndef MUSL_OPTIMIZED_BUILD
 	   " --list-plugins                Print info on all loaded plugins and exit.\n"
-#ifndef MINIMAL_BUILD
 	   " -m <url[,marathon_url]>, --mesos-api <url[,marathon_url]>\n"
 	   "                               Enable Mesos support by connecting to the API server\n"
 	   "                               specified as argument. E.g. \"http://admin:password@127.0.0.1:5050\".\n"
@@ -556,7 +556,9 @@ int falco_init(int argc, char **argv)
 			{"k8s-api", required_argument, 0, 'k'},
 			{"k8s-node", required_argument, 0},
 			{"list", optional_argument, 0},
+#ifndef MUSL_OPTIMIZED_BUILD
 			{"list-plugins", no_argument, 0},
+#endif
 			{"mesos-api", required_argument, 0, 'm'},
 			{"option", required_argument, 0, 'o'},
 			{"pidfile", required_argument, 0, 'P'},
@@ -749,10 +751,12 @@ int falco_init(int argc, char **argv)
 						list_flds_source = optarg;
 					}
 				}
+#ifndef MUSL_OPTIMIZED_BUILD
 				else if (string(long_options[long_index].name) == "list-plugins")
 				{
 					list_plugins = true;
 				}
+#endif
 				else if (string(long_options[long_index].name) == "stats-interval")
 				{
 					stats_interval = atoi(optarg);
@@ -942,12 +946,17 @@ int falco_init(int argc, char **argv)
 		std::list<std::shared_ptr<sinsp_plugin>> extractor_plugins;
 		for(auto &p : config.m_plugins)
 		{
+			std::shared_ptr<sinsp_plugin> plugin;
+#ifdef MUSL_OPTIMIZED_BUILD
+			throw std::invalid_argument(string("Can not load/use plugins with musl optimized build"));
+#else
 			falco_logger::log(LOG_INFO, "Loading plugin (" + p.m_name + ") from file " + p.m_library_path + "\n");
 
-			std::shared_ptr<sinsp_plugin> plugin = sinsp_plugin::register_plugin(inspector,
+			plugin = sinsp_plugin::register_plugin(inspector,
 							       p.m_library_path,
 							       (p.m_init_config.empty() ? NULL : (char *)p.m_init_config.c_str()),
 							       plugin_filter_checks);
+#endif
 
 			if(plugin->type() == TYPE_SOURCE_PLUGIN)
 			{