Merge "Accept --base option for GET /changes/<id>/edit:message endpoint"

Documentation/rest-api-changes.txt

@@ -2023,6 +2023,9 @@ returned.
 
 Retrieves commit message from change edit.
 
+If the `base` parameter is set to true, the returned message is from the
+revision that the edit is based on.
+
 .Request
 ----
   GET /changes/myProject~master~I8473b95934b5732ac55d26311a706c9c2bde9940/edit:message HTTP/1.0

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/edit/ChangeEditIT.java

@@ -64,6 +64,9 @@ import org.apache.commons.codec.binary.StringUtils;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
 import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Before;
@@ -362,13 +365,13 @@ public class ChangeEditIT extends AbstractDaemonTest {
 
   @Test
   public void updateMessageRest() throws Exception {
-    adminRestSession.get(urlEditMessage()).assertNotFound();
+    adminRestSession.get(urlEditMessage(false)).assertNotFound();
     EditMessage.Input in = new EditMessage.Input();
     in.message = String.format("New commit message\n\n" +
         CONTENT_NEW2_STR + "\n\nChange-Id: %s\n",
         change.getKey());
-    adminRestSession.put(urlEditMessage(), in).assertNoContent();
-    RestResponse r = adminRestSession.getJsonAccept(urlEditMessage());
+    adminRestSession.put(urlEditMessage(false), in).assertNoContent();
+    RestResponse r = adminRestSession.getJsonAccept(urlEditMessage(false));
     r.assertOK();
     assertThat(readContentFromJson(r)).isEqualTo(in.message);
     Optional<ChangeEdit> edit = editUtil.byChange(change);
@@ -376,10 +379,19 @@ public class ChangeEditIT extends AbstractDaemonTest {
         .isEqualTo(in.message);
     in.message = String.format("New commit message2\n\nChange-Id: %s\n",
         change.getKey());
-    adminRestSession.put(urlEditMessage(), in).assertNoContent();
+    adminRestSession.put(urlEditMessage(false), in).assertNoContent();
     edit = editUtil.byChange(change);
     assertThat(edit.get().getEditCommit().getFullMessage())
         .isEqualTo(in.message);
+
+    r = adminRestSession.getJsonAccept(urlEditMessage(true));
+    try (Repository repo = repoManager.openRepository(project);
+        RevWalk rw = new RevWalk(repo)) {
+      RevCommit commit = rw.parseCommit(
+          ObjectId.fromString(ps.getRevision().get()));
+      assertThat(readContentFromJson(r)).isEqualTo(commit.getFullMessage());
+    }
+
     editUtil.publish(edit.get());
     assertChangeMessages(change,
         ImmutableList.of("Uploaded patch set 1.",
@@ -809,10 +821,11 @@ public class ChangeEditIT extends AbstractDaemonTest {
         + "/edit/";
   }
 
-  private String urlEditMessage() {
+  private String urlEditMessage(boolean base) {
     return "/changes/"
         + change.getChangeId()
-        + "/edit:message";
+        + "/edit:message"
+        + (base ? "?base" : "");
   }
 
   private String urlEditFile() {

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeEdits.java

@@ -48,6 +48,7 @@ import com.google.gerrit.server.edit.ChangeEditJson;
 import com.google.gerrit.server.edit.ChangeEditModifier;
 import com.google.gerrit.server.edit.ChangeEditUtil;
 import com.google.gerrit.server.edit.UnchangedCommitMessageException;
+import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.patch.PatchListNotAvailableException;
 import com.google.gerrit.server.project.InvalidChangeOperationException;
 import com.google.gwtorm.server.OrmException;
@@ -57,6 +58,9 @@ import com.google.inject.Singleton;
 import com.google.inject.assistedinject.Assisted;
 
 import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
 import org.kohsuke.args4j.Option;
 
 import java.io.IOException;
@@ -553,12 +557,19 @@ public class ChangeEdits implements
     }
   }
 
-  @Singleton
   public static class GetMessage implements RestReadView<ChangeResource> {
+    private final GitRepositoryManager repoManager;
     private final ChangeEditUtil editUtil;
 
+    @Option(name = "--base", aliases = {"-b"},
+        usage = "whether to load the message on the base revision instead"
+        + " of the change edit")
+    private boolean base;
+
     @Inject
-    GetMessage(ChangeEditUtil editUtil) {
+    GetMessage(GitRepositoryManager repoManager,
+        ChangeEditUtil editUtil) {
+      this.repoManager = repoManager;
       this.editUtil = editUtil;
     }
 
@@ -566,8 +577,19 @@ public class ChangeEdits implements
     public BinaryResult apply(ChangeResource rsrc) throws AuthException,
         IOException, ResourceNotFoundException, OrmException {
       Optional<ChangeEdit> edit = editUtil.byChange(rsrc.getChange());
+      String msg;
       if (edit.isPresent()) {
-        String msg = edit.get().getEditCommit().getFullMessage();
+        if (base) {
+          try (Repository repo = repoManager.openRepository(rsrc.getProject());
+              RevWalk rw = new RevWalk(repo)) {
+            RevCommit commit = rw.parseCommit(ObjectId.fromString(
+                edit.get().getBasePatchSet().getRevision().get()));
+            msg = commit.getFullMessage();
+          }
+        } else {
+          msg = edit.get().getEditCommit().getFullMessage();
+        }
+
         return BinaryResult.create(msg)
             .setContentType(FileContentUtil.TEXT_X_GERRIT_COMMIT_MESSAGE)
             .base64();