Fix fetching registry credentials when using Gcloud cred helper (#764)

Author: HiranmayaGundu

packages/testcontainers/src/container-runtime/auth/credential-provider.test.ts

@@ -56,6 +56,23 @@ describe("CredentialProvider", () => {
     ).toBeUndefined();
   });
 
+  it("should default to the registry url when the server url is not returned", async () => {
+    mockExecReturns(JSON.stringify({ "https://registry.example.com": "username" }));
+    mockSpawnReturns(
+      0,
+      JSON.stringify({
+        Username: "username",
+        Secret: "secret",
+      })
+    );
+
+    expect(await credentialProvider.getAuthConfig("https://registry.example.com", containerRuntimeConfig)).toEqual({
+      registryAddress: "https://registry.example.com",
+      username: "username",
+      password: "secret",
+    });
+  });
+
   it("should return undefined when no auth config found for registry", async () => {
     mockExecReturns(JSON.stringify({ registry2: "username" }));
 

packages/testcontainers/src/container-runtime/auth/credential-provider.ts

@@ -24,7 +24,9 @@ export abstract class CredentialProvider implements RegistryAuthLocator {
     log.debug(`Executing Docker credential provider "${programName}"`);
 
     const credentials = await this.listCredentials(programName);
-    if (!Object.keys(credentials).some((aRegistry) => registryMatches(aRegistry, registry))) {
+
+    const credentialForRegistry = Object.keys(credentials).find((aRegistry) => registryMatches(aRegistry, registry));
+    if (!credentialForRegistry) {
       log.debug(`No credential found for registry "${registry}"`);
       return undefined;
     }
@@ -34,7 +36,7 @@ export abstract class CredentialProvider implements RegistryAuthLocator {
     return {
       username: response.Username,
       password: response.Secret,
-      registryAddress: response.ServerURL,
+      registryAddress: response.ServerURL ?? credentialForRegistry,
     };
   }