Allow contributor agreements to be optional

By default the contributor agreements are disabled, as there are
no agreements in the database.  Admins which require agreements
must enable them in system_config.

This permits friendly community installations, such as a corporate
location, where access automatically implies agreement to contribute
because it is work-for-hire.

Signed-off-by: Shawn O. Pearce <sop@google.com>

appjar/src/main/java/com/google/gerrit/client/account/AccountSettings.java

@@ -19,6 +19,7 @@ import static com.google.gerrit.client.FormatUtil.mediumFormat;
 import com.google.gerrit.client.Gerrit;
 import com.google.gerrit.client.Link;
 import com.google.gerrit.client.reviewdb.Account;
+import com.google.gerrit.client.rpc.Common;
 import com.google.gerrit.client.rpc.GerritCallback;
 import com.google.gerrit.client.ui.AccountScreen;
 import com.google.gerrit.client.ui.LazyTabChild;
@@ -137,6 +138,7 @@ public class AccountSettings extends AccountScreen {
     }, Util.C.tabWebIdentities());
     tabTokens.add(Link.SETTINGS_WEBIDENT);
 
+    if (Common.getGerritConfig().isUseContributorAgreements()) {
       tabs.add(new LazyTabChild<AgreementPanel>() {
         @Override
         protected AgreementPanel create() {
@@ -144,6 +146,7 @@ public class AccountSettings extends AccountScreen {
         }
       }, Util.C.tabAgreements());
       tabTokens.add(Link.SETTINGS_AGREEMENTS);
+    }
 
     tabs.addTabListener(new TabListener() {
       public boolean onBeforeTabSelected(SourcesTabEvents sender, int tabIndex) {

appjar/src/main/java/com/google/gerrit/client/data/GerritConfig.java

@@ -27,6 +27,7 @@ public class GerritConfig {
   protected List<ApprovalType> approvalTypes;
   protected List<ApprovalType> actionTypes;
   protected int sshdPort;
+  protected boolean useContributorAgreements;
   private transient Map<ApprovalCategory.Id, ApprovalType> byCategoryId;
 
   public GerritConfig() {
@@ -88,6 +89,14 @@ public class GerritConfig {
     sshdPort = p;
   }
 
+  public boolean isUseContributorAgreements() {
+    return useContributorAgreements;
+  }
+
+  public void setUseContributorAgreements(final boolean r) {
+    useContributorAgreements = r;
+  }
+
   public ApprovalType getApprovalType(final ApprovalCategory.Id id) {
     if (byCategoryId == null) {
       byCategoryId = new HashMap<ApprovalCategory.Id, ApprovalType>();

appjar/src/main/java/com/google/gerrit/client/reviewdb/SystemConfig.java

@@ -83,6 +83,10 @@ public final class SystemConfig {
   @Column(notNull = false)
   public transient String gitBasePath;
 
+  /** Is a verified {@link AccountAgreement} required to upload changes? */
+  @Column
+  public boolean useContributorAgreements;
+
   /** Local TCP port number the embedded SSHD server binds onto. */
   @Column
   public int sshdPort;

appjar/src/main/java/com/google/gerrit/server/GerritServer.java

@@ -278,6 +278,7 @@ public class GerritServer {
     final GerritConfig r = new GerritConfig();
     r.setCanonicalUrl(getCanonicalURL());
     r.setSshdPort(sConfig.sshdPort);
+    r.setUseContributorAgreements(sConfig.useContributorAgreements);
     if (sConfig.gitwebUrl != null) {
       r.setGitwebLink(new GitwebLink(sConfig.gitwebUrl));
     }

appjar/src/main/java/com/google/gerrit/server/ssh/Receive.java

@@ -89,7 +89,9 @@ class Receive extends AbstractGitCommand {
   @Override
   protected void runImpl() throws IOException, Failure {
     server = getGerritServer();
+    if (Common.getGerritConfig().isUseContributorAgreements()) {
       verifyActiveContributorAgreement();
+    }
     loadMyEmails();
     lookup(reviewerId, "reviewer", reviewerEmail);
     lookup(ccId, "cc", ccEmail);