Add fetchFilter option to the git submodules (#5518)

* add fetchfilter option to the git submodules

* add fearure flag

* minor chnage

Author: Deekshitha2812

src/Agent.Plugins/GitCliManager.cs

@@ -447,14 +447,19 @@ public async Task<int> GitSubmoduleReset(AgentTaskPluginExecutionContext context
         }
 
         // git submodule update --init --force [--depth=15] [--recursive]
-        public async Task<int> GitSubmoduleUpdate(AgentTaskPluginExecutionContext context, string repositoryPath, int fetchDepth, string additionalCommandLine, bool recursive, CancellationToken cancellationToken)
+        public async Task<int> GitSubmoduleUpdate(AgentTaskPluginExecutionContext context, string repositoryPath, int fetchDepth, IEnumerable<string> filters, string additionalCommandLine, bool recursive, CancellationToken cancellationToken)
         {
             context.Debug("Update the registered git submodules.");
             string options = "update --init --force";
             if (fetchDepth > 0)
             {
                 options = options + $" --depth={fetchDepth}";
             }
+            if (AgentKnobs.UseFetchFilterInGitSubmoduleUpdate.GetValue(context).AsBoolean() && filters != null)
+            {
+                options += " " + string.Join(" ", filters.Select(f => "--filter=" + f));
+            }
+
             if (recursive)
             {
                 options = options + " --recursive";

src/Agent.Plugins/GitSourceProvider.cs

@@ -1200,7 +1200,7 @@ public async Task GetSourceAsync(
                     }
                 }
 
-                int exitCode_submoduleUpdate = await gitCommandManager.GitSubmoduleUpdate(executionContext, targetPath, fetchDepth, string.Join(" ", additionalSubmoduleUpdateArgs), checkoutNestedSubmodules, cancellationToken);
+                int exitCode_submoduleUpdate = await gitCommandManager.GitSubmoduleUpdate(executionContext, targetPath, fetchDepth, additionalFetchFilterOptions, string.Join(" ", additionalSubmoduleUpdateArgs), checkoutNestedSubmodules, cancellationToken);
                 if (exitCode_submoduleUpdate != 0)
                 {
                     throw new InvalidOperationException($"Git submodule update failed with exit code: {exitCode_submoduleUpdate}");

src/Agent.Sdk/Knob/AgentKnobs.cs

@@ -811,6 +811,14 @@ public class AgentKnobs
             new RuntimeKnobSource("AGENT_USE_FETCH_FILTER_IN_CHECKOUT_TASK"),
             new BuiltInDefaultKnobSource("false"));
 
+        public static readonly Knob UseFetchFilterInGitSubmoduleUpdate = new Knob(
+            nameof(UseFetchFilterInGitSubmoduleUpdate),
+            "If true, agent will pass fetch filter options in checkout task to git submodule update.",
+            new PipelineFeatureSource("UseFetchFilterInGitSubmoduleUpdate"),
+            new RuntimeKnobSource("AGENT_USE_FETCH_FILTER_IN_GIT_SUBMODULE_UPDATE"),
+            new EnvironmentKnobSource("AGENT_USE_FETCH_FILTER_IN_GIT_SUBMODULE_UPDATE"),
+            new BuiltInDefaultKnobSource("false"));
+
         public static readonly Knob StoreAgentKeyInCSPContainer = new Knob(
             nameof(StoreAgentKeyInCSPContainer),
             "Store agent key in named container (Windows).",