Respect `remote.mirror` option in DeleteRefCommand

When the `remote.mirror` option is disable, the replica should ignore
branch and tag deletions. This is handled correctly for CGit and JGit
fetches, but is ignored when ref deletion is applied through
`ApplyObjectAction`.

This change adds a check for `mirror` option status to the
`DeleteRefCommand` and ignores it when it is set to `false`. This is
aligning HTTP and Brodker-based implementations with the behaviour of
`git fetch` command.

Bug: Issue 40015323
Change-Id: Idf565ddb69602be9af41857ca5135db7b5429570

src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java
index 0f7af40..9984a03 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java
@@ -906,6 +906,10 @@
     return config.replicateProjectDeletions();
   }
 
+  public boolean isMirror() {
+    return config.getRemoteConfig().isMirror();
+  }
+
   public boolean enableBatchedRefs() {
     return config.enableBatchedRefs();
   }

src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java
index f204f89..3150fe1 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java
@@ -68,6 +68,18 @@
 
   public void deleteRef(Project.NameKey name, String refName, String sourceLabel)
       throws IOException, RestApiException {
+    Source source =
+        sourcesCollection
+            .getByRemoteName(sourceLabel)
+            .orElseThrow(
+                () ->
+                    new IllegalStateException(
+                        String.format("Could not find URI for %s remote", sourceLabel)));
+    if (!source.isMirror()) {
+      repLog.info(
+          "Ignoring ref {} deletion from project {}, as mirror option is false", refName, name);
+      return;
+    }
     try {
       repLog.info("Delete ref from {} for project {}, ref name {}", sourceLabel, name, refName);
       Optional<ProjectState> projectState = projectCache.get(name);
@@ -81,13 +93,6 @@
         return;
       }
 
-      Source source =
-          sourcesCollection
-              .getByRemoteName(sourceLabel)
-              .orElseThrow(
-                  () ->
-                      new IllegalStateException(
-                          String.format("Could not find URI for %s remote", sourceLabel)));
       URIish sourceUri = source.getURI(name);
 
       try {

src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java
index 6e40226..9c9c689 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java
@@ -19,6 +19,7 @@
 import static org.mockito.Mockito.anyString;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
 import static org.mockito.Mockito.when;
 
 import com.google.gerrit.entities.Project;
@@ -106,6 +107,8 @@
 
   @Test
   public void shouldSendEventWhenDeletingRef() throws Exception {
+    when(source.isMirror()).thenReturn(true);
+
     objectUnderTest.deleteRef(TEST_PROJECT_NAME, TEST_REF_NAME, TEST_SOURCE_LABEL);
 
     verify(eventDispatcher).postEvent(eventCaptor.capture());
@@ -117,7 +120,17 @@
   }
 
   @Test
+  public void shouldNotSendNotSendEventWhenMirroringIsDisabled() throws Exception {
+    when(source.isMirror()).thenReturn(false);
+
+    objectUnderTest.deleteRef(TEST_PROJECT_NAME, TEST_REF_NAME, TEST_SOURCE_LABEL);
+
+    verifyNoInteractions(eventDispatcher);
+  }
+
+  @Test
   public void shouldHandleNonExistingRef() throws Exception {
+    when(source.isMirror()).thenReturn(true);
     when(refDb.exactRef(anyString())).thenReturn(null);
 
     objectUnderTest.deleteRef(TEST_PROJECT_NAME, NON_EXISTING_REF_NAME, TEST_SOURCE_LABEL);