Refactor ENOSPC check into isDiskConfigurationError function

Author: mbg

lib/entry-points.js

@@ -51,6 +51,24 @@ test.beforeEach(() => {
   });
 });
 
+test("isDiskConfigurationError - true for expected errors", async (t) => {
+  t.true(
+    codeql.isDiskConfigurationError(new Error("ENOSPC: Out of disk space")),
+  );
+});
+
+test("isDiskConfigurationError - false for other errors", async (t) => {
+  t.false(codeql.isDiskConfigurationError("Not an Error instance"));
+
+  const otherMessages = [
+    "Does not contain an error code we test for",
+    "ENOSP: Not quite the full error code",
+  ];
+  for (const otherMessage of otherMessages) {
+    t.false(codeql.isDiskConfigurationError(new Error(otherMessage)));
+  }
+});
+
 async function installIntoToolcache({
   apiDetails = SAMPLE_DOTCOM_API_DETAILS,
   cliVersion,

src/codeql.test.ts

@@ -273,6 +273,21 @@ const GHES_MOST_RECENT_DEPRECATION_DATE = "2026-07-01";
 /** The CLI verbosity level to use for extraction in debug mode. */
 const EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 
+/**
+ * Decides whether `e` is a disk-related error outside of our control
+ * that should be classified as a `ConfigurationError`.
+ *
+ * @param e The error to check.
+ * @returns True if the error should be treated as a `ConfigurationError` or false if not.
+ */
+export function isDiskConfigurationError(e: unknown): boolean {
+  if (!(e instanceof Error)) {
+    return false;
+  }
+
+  return e.message.includes("ENOSPC"); // out of disk space
+}
+
 /**
  * Set up CodeQL CLI access.
  *
@@ -343,8 +358,7 @@ export async function setupCodeQL(
   } catch (rawError) {
     const e = api.wrapApiConfigurationError(rawError);
     const ErrorClass =
-      e instanceof util.ConfigurationError ||
-      (e instanceof Error && e.message.includes("ENOSPC")) // out of disk space
+      e instanceof util.ConfigurationError || isDiskConfigurationError(e)
         ? util.ConfigurationError
         : Error;