Only warn for missing config if init was successful

src/codeql.ts

@@ -928,12 +928,17 @@ async function getCodeQLForCmd(
         getGeneratedCodeScanningConfigPath(config);
 
       if (!fs.existsSync(configPath)) {
-        logger.warning(
-          [
-            `Expected a configuration file at '${configPath}', which does not exist.`,
-            "Continuing with diagnostics export anyway, without a configuration file.",
-          ].join(" "),
-        );
+        // Warn if there is no configuration file, even though `config` claims that `init`
+        // was successful. This shouldn't be happening.
+        if (config.successfullyInitialised) {
+          logger.warning(
+            [
+              `Expected a configuration file at '${configPath}', which does not exist.`,
+              "Continuing with diagnostics export anyway, without a configuration file.",
+            ].join(" "),
+          );
+        }
+
         configPath = undefined;
       }
 

src/config-utils.ts

@@ -465,6 +465,8 @@ export async function initActionState(
     overlayModeSetExplicitly: false,
     repositoryProperties,
     enableFileCoverageInformation,
+    // We don't set this to `true` until `init` is successful.
+    successfullyInitialised: false,
   };
 }
 

src/config/action-config.ts

@@ -130,6 +130,9 @@ export interface Config {
    * Whether to enable file coverage information.
    */
   enableFileCoverageInformation: boolean;
+
+  /** Whether the analysis was successfully initialised using the configuration. */
+  successfullyInitialised: boolean;
 }
 
 /** Properties available in `Config`. */

src/init-action.ts

@@ -775,6 +775,7 @@ async function run(
     // may have updated the config returned from `initConfig`, e.g. to revert to
     // `OverlayDatabaseMode.None` if we failed to download an overlay-base
     // database.
+    config.successfullyInitialised = true;
     await configUtils.saveConfig(config, logger);
 
     core.setOutput("codeql-path", config.codeQLCmd);

src/testing-utils.ts

@@ -1031,6 +1031,7 @@ export function createTestConfig(overrides: Partial<Config>): Config {
       overlayModeSetExplicitly: false,
       repositoryProperties: {},
       enableFileCoverageInformation: true,
+      successfullyInitialised: false,
     } satisfies Config,
     overrides,
   );