Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Update codemirror-editor
  Update git submodules
  Bazel: Fix plugin api javadoc generation
  Update git submodules
  Update git submodules
  Update git submodules
  Update git submodules
  ElasticContainer: Upgrade V6_8 to elasticsearch 6.8.7
  Add new prolog fact to documentation
  Add prolog predicate to determine number of parents

Change-Id: Ic8b28c079a74483242f9880839f6062ee02cabfa

Documentation/prolog-change-facts.txt

@@ -48,6 +48,9 @@ of them we must use a qualified name like `gerrit:change_branch(X)`.
 |`commit_message/1`   |`commit_message('Fix bug X').`
     |Commit message as string atom
 
+|`commit_parent_count/1`   |`commit_parent_count(1).`
+    |Number of parent commits of a commit. Can be used to detect merge commits
+
 |`commit_stats/3`   |`commit_stats(5,20,50).`
     |Number of files modified, number of insertions and the number of deletions.
 

java/gerrit/PRED_commit_parent_count_1.java

@@ -0,0 +1,51 @@
+// Copyright (C) 2020 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 gerrit;
+
+import com.google.gerrit.server.rules.StoredValues;
+import com.googlecode.prolog_cafe.exceptions.PrologException;
+import com.googlecode.prolog_cafe.lang.IntegerTerm;
+import com.googlecode.prolog_cafe.lang.Operation;
+import com.googlecode.prolog_cafe.lang.Predicate;
+import com.googlecode.prolog_cafe.lang.Prolog;
+import com.googlecode.prolog_cafe.lang.Term;
+import org.eclipse.jgit.revwalk.RevCommit;
+
+/**
+ * Prolog fact for the number of parents of a given commit
+ *
+ * <pre>
+ *   'commit_parent_count'(-Count)
+ * </pre>
+ */
+public class PRED_commit_parent_count_1 extends Predicate.P1 {
+  public PRED_commit_parent_count_1(Term a1, Operation n) {
+    arg1 = a1;
+    cont = n;
+  }
+
+  @Override
+  public Operation exec(Prolog engine) throws PrologException {
+    engine.setB0();
+    Term a1 = arg1.dereference();
+
+    RevCommit commit = StoredValues.COMMIT.get(engine);
+
+    if (!a1.unify(new IntegerTerm(commit.getParentCount()), engine.trail)) {
+      return engine.fail();
+    }
+    return cont;
+  }
+}

javatests/com/google/gerrit/elasticsearch/ElasticContainer.java

@@ -53,7 +53,7 @@ public class ElasticContainer extends ElasticsearchContainer {
       case V6_7:
         return "blacktop/elasticsearch:6.7.2";
       case V6_8:
-        return "blacktop/elasticsearch:6.8.6";
+        return "blacktop/elasticsearch:6.8.7";
       case V7_0:
         return "blacktop/elasticsearch:7.0.1";
       case V7_1:

plugins/codemirror-editor

@@ -1 +1 @@
-Subproject commit 92ce310ecf717133601b9e824c38bc5e5eafecba
+Subproject commit 59942b1adf1c949f3633f60ac42f67fae03b3255

plugins/delete-project

@@ -1 +1 @@
-Subproject commit 0ae632098fec9d60932e53a8816ae434f28bc59f
+Subproject commit 4e74ff291292ea3416802c532a1b9a3c54026ae9

plugins/gitiles

@@ -1 +1 @@
-Subproject commit 0912a48d51981d86e7912c8d682ce75d62afb81d
+Subproject commit 676a6cbb5f43b66d1d8d618a0f32aba09ac827cb

plugins/replication

@@ -1 +1 @@
-Subproject commit 8c28ecec73a4017588ebddb2e869d88fa571fc64
+Subproject commit 9d1d158c0f4b48581183b878aebc4bfb61450af3

plugins/webhooks

@@ -1 +1 @@
-Subproject commit 377fec17d2c0fc71cdfb1d12f502cfa1eba1fbd7
+Subproject commit 33eeeb697d6a7bb03eed1b776bea40e26d5df31c

tools/bzl/javadoc.bzl

@@ -32,7 +32,7 @@ def _impl(ctx):
         "export TZ",
         "rm -rf %s" % source,
         "mkdir %s" % source,
-        " && ".join(["unzip -qud %s %s" % (source, j.path) for j in source_jars.to_list()]),
+        " && ".join(["unzip -qoud %s %s" % (source, j.path) for j in source_jars.to_list()]),
         "rm -rf %s" % dir,
         "mkdir %s" % dir,
         " ".join([