fix: Exec hangs

src/KubernetesClient/KubernetesClientConfiguration.ConfigFile.cs

@@ -548,24 +548,33 @@ public static ExecCredentialResponse ExecuteExternalCommand(ExternalExecution co
 
             var process = CreateRunnableExternalProcess(config);
 
+            var stdout = "";
+            var stderr = "";
+
+            process.OutputDataReceived += (sender, args) => stdout += args.Data;
+            process.ErrorDataReceived += (sender, args) => stderr += args.Data;
+
             try
             {
                 process.Start();
+                process.BeginOutputReadLine();
+                process.BeginErrorReadLine();
             }
             catch (Exception ex)
             {
                 throw new KubeConfigException($"external exec failed due to: {ex.Message}");
             }
 
-            var stdout = process.StandardOutput.ReadToEnd();
-            var stderr = process.StandardError.ReadToEnd();
-            if (string.IsNullOrWhiteSpace(stderr) == false)
+            // Wait for a maximum of 5 seconds, if a response takes longer probably something went wrong...
+            if (!process.WaitForExit(5000) && string.IsNullOrWhiteSpace(stderr))
             {
-                throw new KubeConfigException($"external exec failed due to: {stderr}");
+                throw new KubeConfigException("external exec failed due to timeout");
             }
 
-            // Wait for a maximum of 5 seconds, if a response takes longer probably something went wrong...
-            process.WaitForExit(5);
+            if (!string.IsNullOrWhiteSpace(stderr))
+            {
+                throw new KubeConfigException($"external exec failed due to: {stderr}");
+            }
 
             try
             {