Allow per project maxObjectSizeLimit.

Project owners can define receive.maxObjectSizeLimit in their
project.config in order to further restrict the global
receive.maxObjectSizeLimit setting from etc/gerrit.config.  The project
specific maxObjectSizeLimit is only honored if smaller than the global
maxObjectSizeLimit, otherwise it is ignored.

Change-Id: Ia14354e0c9b6bfb4fa62295162e8f2c127b09997

Documentation/config-gerrit.txt

@@ -2099,6 +2099,10 @@ limit.
 Gerrit administrators can use this setting to prevent developers
 from pushing objects which are too large to Gerrit.
 +
+This setting can also be set in the `project.config` in order to further
+reduce the global setting. The project specific setting is only honored
+when it further reduces the global limit.
++
 Default is zero.
 +
 Common unit suffixes of 'k', 'm', or 'g' are supported.

gerrit-server/src/main/java/com/google/gerrit/server/git/ProjectConfig.java

@@ -107,6 +107,7 @@ public class ProjectConfig extends VersionedMetaData {
   private static final String RECEIVE = "receive";
   private static final String KEY_REQUIRE_SIGNED_OFF_BY = "requireSignedOffBy";
   private static final String KEY_REQUIRE_CHANGE_ID = "requireChangeId";
+  private static final String KEY_MAX_OBJECT_SIZE_LIMIT = "maxObjectSizeLimit";
   private static final String KEY_REQUIRE_CONTRIBUTOR_AGREEMENT =
       "requireContributorAgreement";
 
@@ -145,6 +146,7 @@ public class ProjectConfig extends VersionedMetaData {
   private List<CommentLinkInfo> commentLinkSections;
   private List<ValidationError> validationErrors;
   private ObjectId rulesId;
+  private long maxObjectSizeLimit;
 
   public static ProjectConfig read(MetaDataUpdate update) throws IOException,
       ConfigInvalidException {
@@ -318,6 +320,14 @@ public class ProjectConfig extends VersionedMetaData {
     return rulesId;
   }
 
+  /**
+   * @return the maxObjectSizeLimit for this project, if set. Zero if this
+   *         project doesn't define own maxObjectSizeLimit.
+   */
+  public long getMaxObjectSizeLimit() {
+    return maxObjectSizeLimit;
+  }
+
   /**
    * Check all GroupReferences use current group name, repairing stale ones.
    *
@@ -386,6 +396,8 @@ public class ProjectConfig extends VersionedMetaData {
     loadNotifySections(rc, groupsByName);
     loadLabelSections(rc);
     loadCommentLinkSections(rc);
+
+    maxObjectSizeLimit = rc.getLong(RECEIVE, null, KEY_MAX_OBJECT_SIZE_LIMIT, 0);
   }
 
   private void loadAccountsSection(

gerrit-server/src/main/java/com/google/gerrit/server/project/ProjectState.java

@@ -216,6 +216,10 @@ public class ProjectState {
     return config;
   }
 
+  public long getMaxObjectSizeLimit() {
+    return config.getMaxObjectSizeLimit();
+  }
+
   /** Get the sections that pertain only to this project. */
   List<SectionMatcher> getLocalAccessSections() {
     List<SectionMatcher> sm = localAccessSections;

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

@@ -94,7 +94,7 @@ final class Receive extends AbstractGitCommand {
     final ReceivePack rp = receive.getReceivePack();
     rp.setRefLogIdent(currentUser.newRefLogIdent());
     rp.setTimeout(config.getTimeout());
-    rp.setMaxObjectSizeLimit(config.getMaxObjectSizeLimit());
+    rp.setMaxObjectSizeLimit(getMaxObjectSizeLimit());
     try {
       receive.advertiseHistory();
       rp.receive(in, out, err);
@@ -170,4 +170,15 @@ final class Receive extends AbstractGitCommand {
       }
     }
   }
+
+  private long getMaxObjectSizeLimit() {
+    long global = config.getMaxObjectSizeLimit();
+    long local = projectControl.getProjectState().getMaxObjectSizeLimit();
+    if (global > 0 && local > 0) {
+      return Math.min(global, local);
+    } else {
+      // zero means "no limit", in this case the max is more limiting
+      return Math.max(global, local);
+    }
+  }
 }