Install "git-lfs-authenticate" SSH command when lfs.plugin is configured

SSH command registration was extended so that command gets registered
only in case when plugin is configured in gerrit.config.

Change-Id: Iffaf00775bdf1242e1fbe1dea15e5ce0bf912079
Signed-off-by: Jacek Centkowski <geminica.programs@gmail.com>

gerrit-pgm/src/main/java/com/google/gerrit/pgm/Daemon.java

@@ -87,6 +87,7 @@ import com.google.gerrit.sshd.SshKeyCacheImpl;
 import com.google.gerrit.sshd.SshModule;
 import com.google.gerrit.sshd.commands.DefaultCommandModule;
 import com.google.gerrit.sshd.commands.IndexCommandsModule;
+import com.google.gerrit.sshd.plugin.LfsPluginAuthCommand;
 import com.google.inject.AbstractModule;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
@@ -439,7 +440,8 @@ public class Daemon extends SiteProgram {
       modules.add(new SshHostKeyModule());
     }
     modules.add(new DefaultCommandModule(slave,
-        sysInjector.getInstance(DownloadConfig.class)));
+        sysInjector.getInstance(DownloadConfig.class),
+        sysInjector.getInstance(LfsPluginAuthCommand.Module.class)));
     if (!slave && indexType == IndexType.LUCENE) {
       modules.add(new IndexCommandsModule());
     }

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

@@ -27,10 +27,13 @@ import com.google.gerrit.sshd.plugin.LfsPluginAuthCommand;
 /** Register the commands a Gerrit server supports. */
 public class DefaultCommandModule extends CommandModule {
   private final DownloadConfig downloadConfig;
+  private final LfsPluginAuthCommand.Module lfsPluginAuthModule;
 
-  public DefaultCommandModule(boolean slave, DownloadConfig downloadCfg) {
+  public DefaultCommandModule(boolean slave, DownloadConfig downloadCfg,
+      LfsPluginAuthCommand.Module module) {
     slaveMode = slave;
     downloadConfig = downloadCfg;
+    lfsPluginAuthModule = module;
   }
 
   @Override
@@ -124,7 +127,7 @@ public class DefaultCommandModule extends CommandModule {
     alias(logging, "ls", ListLoggingLevelCommand.class);
     alias(logging, "set", SetLoggingLevelCommand.class);
 
-    install(new LfsPluginAuthCommand.Module());
+    install(lfsPluginAuthModule);
   }
 
   private boolean sshEnabled() {

gerrit-sshd/src/main/java/com/google/gerrit/sshd/plugin/LfsPluginAuthCommand.java

@@ -16,11 +16,13 @@ package com.google.gerrit.sshd.plugin;
 
 import com.google.gerrit.extensions.registration.DynamicItem;
 import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.sshd.CommandModule;
 import com.google.gerrit.sshd.SshCommand;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 
+import org.eclipse.jgit.lib.Config;
 import org.kohsuke.args4j.Argument;
 
 import java.util.ArrayList;
@@ -33,12 +35,21 @@ public class LfsPluginAuthCommand extends SshCommand {
   }
 
   public static class Module extends CommandModule {
+    private final boolean pluginProvided;
+
+    @Inject
+    Module(@GerritServerConfig Config cfg) {
+      pluginProvided = cfg.getString("lfs", null, "plugin") != null;
+    }
+
     @Override
     protected void configure() {
+      if (pluginProvided) {
         command("git-lfs-authenticate").to(LfsPluginAuthCommand.class);
         DynamicItem.itemOf(binder(), LfsSshPluginAuth.class);
       }
     }
+  }
 
   private final DynamicItem<LfsSshPluginAuth> auth;
   private final Provider<CurrentUser> user;

gerrit-war/src/main/java/com/google/gerrit/httpd/WebAppInitializer.java

@@ -72,6 +72,7 @@ import com.google.gerrit.sshd.SshKeyCacheImpl;
 import com.google.gerrit.sshd.SshModule;
 import com.google.gerrit.sshd.commands.DefaultCommandModule;
 import com.google.gerrit.sshd.commands.IndexCommandsModule;
+import com.google.gerrit.sshd.plugin.LfsPluginAuthCommand;
 import com.google.inject.AbstractModule;
 import com.google.inject.CreationException;
 import com.google.inject.Guice;
@@ -356,7 +357,8 @@ public class WebAppInitializer extends GuiceServletContextListener
     modules.add(sysInjector.getInstance(SshModule.class));
     modules.add(new SshHostKeyModule());
     modules.add(new DefaultCommandModule(false,
-        sysInjector.getInstance(DownloadConfig.class)));
+        sysInjector.getInstance(DownloadConfig.class),
+        sysInjector.getInstance(LfsPluginAuthCommand.Module.class)));
     if (indexType == IndexType.LUCENE) {
       modules.add(new IndexCommandsModule());
     }