Integration tests: Pass config to OIL tests on the command line

Instead of using an environment variable, pass the path to the config
file as a command line argument. This makes it possible to directly
copy the command being run (as show with --verbose) and run it in a
debugger outside of the test framework.

Old verbose output:
  Running: /home/ajor/src/object-introspection3/build/test/integration/integration_test_target oil cycles_unique_ptr

New verbose output:
  Running: /home/ajor/src/object-introspection3/build/test/integration/integration_test_target oil cycles_unique_ptr /home/ajor/src/object-introspection3/build/testing.oid.toml

test/integration/gen_tests.py

@@ -131,7 +131,7 @@ def add_test_setup(f, config):
         oil_func_body = (
             f"\n"
             f"ObjectIntrospection::options opts{{\n"
-            f'  .configFilePath = std::getenv("CONFIG_FILE_PATH"),\n'
+            f"  .configFilePath = configFile,\n"
             f"  .debugLevel = 3,\n"
             f'  .sourceFileDumpPath = "oil_jit_code.cpp",\n'
             f"}};"
@@ -160,21 +160,36 @@ def add_test_setup(f, config):
 def add_common_code(f):
     f.write(
         """
+void usage(const std::string &argv0) {
+  std::cerr << "usage: " << argv0 << " oid CASE ITERATIONS" << std::endl;
+  std::cerr << "       " << argv0 << " oil CASE CONFIG_FILE" << std::endl;
+}
+
 int main(int argc, char *argv[]) {
-  if (argc < 3 || argc > 4) {
-    std::cerr << "usage: " << argv[0] << " oid/oil CASE [ITER]" << std::endl;
+  if (argc != 4) {
+    usage(argv[0]);
     return -1;
   }
 
   std::string mode = argv[1];
   std::string test_case = argv[2];
 
-  int iterations = 1000;
-  if (argc == 4) {
+  int iterations = 1;
+
+  if (mode == "oid") {
     std::istringstream iss(argv[3]);
     iss >> iterations;
-    if (iss.fail())
-      iterations = 1000;
+    if (iss.fail()) {
+      usage(argv[0]);
+      return -1;
+    }
+  }
+  else if (mode == "oil") {
+    configFile = argv[3];
+  }
+  else {
+    usage(argv[0]);
+    return -1;
   }
 
 """
@@ -224,6 +239,7 @@ def gen_target(output_target_name, test_configs):
                     f"thrift/annotation/gen-cpp2/{config['suite']}_types.h"
                 ]
         add_headers(f, sorted(headers), thrift_headers)
+        f.write("std::string configFile;")
 
         for config in test_configs:
             add_test_setup(f, config)
@@ -334,7 +350,7 @@ def add_oil_integration_test(f, config, case_name, case):
         f"  ba::io_context ctx;\n"
         f"  auto target = runOilTarget({{\n"
         f"    .ctx = ctx,\n"
-        f'    .targetArgs = "oil {case_str} 1",\n'
+        f'    .targetArgs = "oil {case_str}",\n'
         f"  }}, std::move(configOptions));\n\n"
         f"  ASSERT_EQ(exit_code(target), {exit_code});\n"
         f"\n"

test/integration/runner_common.cpp

@@ -172,7 +172,8 @@ OidProc OidIntegration::runOidOnProcess(OidOpts opts,
                                         std::vector<std::string> extra_args,
                                         std::string extra_config) {
   // Binary paths are populated by CMake
-  std::string targetExe = std::string(TARGET_EXE_PATH) + " " + opts.targetArgs;
+  std::string targetExe =
+      std::string(TARGET_EXE_PATH) + " " + opts.targetArgs + " 1000";
 
   /* Spawn the target process with all IOs redirected to /dev/null to not polute
    * the terminal */
@@ -256,8 +257,8 @@ OidProc OidIntegration::runOidOnProcess(OidOpts opts,
   // clang-format off
   bp::child oidProcess(
       oidExe,
-      bp::env["OID_METRICS_TRACE"] = "time",
       bp::args(oid_args),
+      bp::env["OID_METRICS_TRACE"] = "time",
       bp::std_in  < bp::null,
       bp::std_out > std_out_pipe,
       bp::std_err > std_err_pipe,
@@ -337,7 +338,10 @@ std::string OilIntegration::TmpDirStr() {
 }
 
 Proc OilIntegration::runOilTarget(OidOpts opts, std::string extra_config) {
-  std::string targetExe = std::string(TARGET_EXE_PATH) + " " + opts.targetArgs;
+  fs::path thisConfig = createCustomConfig(extra_config);
+
+  std::string targetExe = std::string(TARGET_EXE_PATH) + " " + opts.targetArgs +
+                          " " + thisConfig.string();
 
   if (verbose) {
     std::cerr << "Running: " << targetExe << std::endl;
@@ -375,8 +379,6 @@ Proc OilIntegration::runOilTarget(OidOpts opts, std::string extra_config) {
     // clang-format on
   }
 
-  fs::path thisConfig = createCustomConfig(extra_config);
-
   /* Spawn target with tracing on and IOs redirected in custom pipes to be read
    * later */
   // clang-format off
@@ -385,7 +387,6 @@ Proc OilIntegration::runOilTarget(OidOpts opts, std::string extra_config) {
       bp::std_in  < bp::null,
       bp::std_out > std_out_pipe,
       bp::std_err > std_err_pipe,
-      bp::env["CONFIG_FILE_PATH"] = thisConfig.string(),
       opts.ctx);
   // clang-format on