Add ssh command to list groups.

Change-Id: Iaae73ec644e4f1ca631e8be1d90f7334ae5bd8c7
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/DefaultCommandModule.java

@@ -37,6 +37,7 @@ public class DefaultCommandModule extends CommandModule {
     command(gerrit).toProvider(new DispatchCommandProvider(gerrit));
     command(gerrit, "flush-caches").to(FlushCaches.class);
     command(gerrit, "ls-projects").to(ListProjects.class);
+    command(gerrit, "ls-groups").to(ListGroupsCommand.class);
     command(gerrit, "query").to(Query.class);
     command(gerrit, "show-caches").to(ShowCaches.class);
     command(gerrit, "show-connections").to(ShowConnections.class);

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/ListGroupsCommand.java

@@ -0,0 +1,62 @@
+// Copyright (C) 2011 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.sshd.commands;
+
+import com.google.gerrit.common.data.GroupDetail;
+import com.google.gerrit.common.data.GroupList;
+import com.google.gerrit.common.errors.NoSuchGroupException;
+import com.google.gerrit.server.account.VisibleGroups;
+import com.google.gerrit.sshd.BaseCommand;
+import com.google.gwtorm.client.OrmException;
+import com.google.inject.Inject;
+
+import org.apache.sshd.server.Environment;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class ListGroupsCommand extends BaseCommand {
+
+  @Inject
+  private VisibleGroups.Factory visibleGroupsFactory;
+
+  @Override
+  public void start(final Environment env) throws IOException {
+    startThread(new CommandRunnable() {
+      @Override
+      public void run() throws Exception {
+        parseCommandLine();
+        ListGroupsCommand.this.display();
+      }
+    });
+  }
+
+  private void display() throws Failure {
+    final PrintWriter stdout = toPrintWriter(out);
+    try {
+      final GroupList visibleGroups =
+          visibleGroupsFactory.create().get();
+      for (final GroupDetail groupDetail : visibleGroups.getGroups()) {
+        stdout.print(groupDetail.group.getName() + "\n");
+      }
+    } catch (OrmException e) {
+      throw die(e);
+    } catch (NoSuchGroupException e) {
+      throw die(e);
+    } finally {
+      stdout.flush();
+    }
+  }
+}