CommitCommand: Ensure unmerged paths are added correctly with setOnly

With bug 391855, PathEdit will be changed to apply an edit for each
stage. With that, CommitCommand would no longer work correctly when
committing an unmerged path.

This changes it to use a DirCacheBuilder which allows us to correctly
replace the entries for the three stages with one, which is not possible
with PathEdit.

Bug: 391859
Change-Id: I6dc180aec7e2cbf8d1e91f50482c95bc420f79de

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitCommandTest.java

@@ -55,6 +55,8 @@
 import org.eclipse.jgit.api.errors.WrongRepositoryStateException;
 import org.eclipse.jgit.diff.DiffEntry;
 import org.eclipse.jgit.dircache.DirCache;
+import org.eclipse.jgit.dircache.DirCacheBuilder;
+import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.lib.ConfigConstants;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
@@ -471,4 +473,56 @@ public void commitAmendWithAuthorShouldUseIt() throws Exception {
 		assertEquals("New Author", amendedAuthor.getName());
 		assertEquals("newauthor@example.org", amendedAuthor.getEmailAddress());
 	}
+
+	@Test
+	public void commitOnlyShouldCommitUnmergedPathAndNotAffectOthers()
+			throws Exception {
+		DirCache index = db.lockDirCache();
+		DirCacheBuilder builder = index.builder();
+		addUnmergedEntry("unmerged1", builder);
+		addUnmergedEntry("unmerged2", builder);
+		DirCacheEntry other = new DirCacheEntry("other");
+		other.setFileMode(FileMode.REGULAR_FILE);
+		builder.add(other);
+		builder.commit();
+
+		writeTrashFile("unmerged1", "unmerged1 data");
+		writeTrashFile("unmerged2", "unmerged2 data");
+		writeTrashFile("other", "other data");
+
+		assertEquals("[other, mode:100644]"
+				+ "[unmerged1, mode:100644, stage:1]"
+				+ "[unmerged1, mode:100644, stage:2]"
+				+ "[unmerged1, mode:100644, stage:3]"
+				+ "[unmerged2, mode:100644, stage:1]"
+				+ "[unmerged2, mode:100644, stage:2]"
+				+ "[unmerged2, mode:100644, stage:3]",
+				indexState(0));
+
+		Git git = new Git(db);
+		RevCommit commit = git.commit().setOnly("unmerged1")
+				.setMessage("Only one file").call();
+
+		assertEquals("[other, mode:100644]" + "[unmerged1, mode:100644]"
+				+ "[unmerged2, mode:100644, stage:1]"
+				+ "[unmerged2, mode:100644, stage:2]"
+				+ "[unmerged2, mode:100644, stage:3]",
+				indexState(0));
+
+		TreeWalk walk = TreeWalk.forPath(db, "unmerged1", commit.getTree());
+		assertEquals(FileMode.REGULAR_FILE, walk.getFileMode(0));
+		walk.release();
+	}
+
+	private static void addUnmergedEntry(String file, DirCacheBuilder builder) {
+		DirCacheEntry stage1 = new DirCacheEntry(file, DirCacheEntry.STAGE_1);
+		DirCacheEntry stage2 = new DirCacheEntry(file, DirCacheEntry.STAGE_2);
+		DirCacheEntry stage3 = new DirCacheEntry(file, DirCacheEntry.STAGE_3);
+		stage1.setFileMode(FileMode.REGULAR_FILE);
+		stage2.setFileMode(FileMode.REGULAR_FILE);
+		stage3.setFileMode(FileMode.REGULAR_FILE);
+		builder.add(stage1);
+		builder.add(stage2);
+		builder.add(stage3);
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/api/CommitCommand.java

@@ -58,10 +58,8 @@
 import org.eclipse.jgit.api.errors.UnmergedPathsException;
 import org.eclipse.jgit.api.errors.WrongRepositoryStateException;
 import org.eclipse.jgit.dircache.DirCache;
+import org.eclipse.jgit.dircache.DirCacheBuildIterator;
 import org.eclipse.jgit.dircache.DirCacheBuilder;
-import org.eclipse.jgit.dircache.DirCacheEditor;
-import org.eclipse.jgit.dircache.DirCacheEditor.DeletePath;
-import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
 import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.dircache.DirCacheIterator;
 import org.eclipse.jgit.errors.UnmergedPathException;
@@ -298,25 +296,26 @@ private DirCache createTemporaryIndex(ObjectId headId, DirCache index)
 			throws IOException {
 		ObjectInserter inserter = null;
 
-		// get DirCacheEditor to modify the index if required
-		DirCacheEditor dcEditor = index.editor();
+		// get DirCacheBuilder for existing index
+		DirCacheBuilder existingBuilder = index.builder();
 
 		// get DirCacheBuilder for newly created in-core index to build a
 		// temporary index for this commit
 		DirCache inCoreIndex = DirCache.newInCore();
-		DirCacheBuilder dcBuilder = inCoreIndex.builder();
+		DirCacheBuilder tempBuilder = inCoreIndex.builder();
 
 		onlyProcessed = new boolean[only.size()];
 		boolean emptyCommit = true;
 
 		TreeWalk treeWalk = new TreeWalk(repo);
-		int dcIdx = treeWalk.addTree(new DirCacheIterator(index));
+		int dcIdx = treeWalk.addTree(new DirCacheBuildIterator(existingBuilder));
 		int fIdx = treeWalk.addTree(new FileTreeIterator(repo));
 		int hIdx = -1;
 		if (headId != null)
 			hIdx = treeWalk.addTree(new RevWalk(repo).parseTree(headId));
 		treeWalk.setRecursive(true);
 
+		String lastAddedFile = null;
 		while (treeWalk.next()) {
 			String path = treeWalk.getPathString();
 			// check if current entry's path matches a specified path
@@ -326,11 +325,12 @@ private DirCache createTemporaryIndex(ObjectId headId, DirCache index)
 			if (hIdx != -1)
 				hTree = treeWalk.getTree(hIdx, CanonicalTreeParser.class);
 
+			DirCacheIterator dcTree = treeWalk.getTree(dcIdx,
+					DirCacheIterator.class);
+
 			if (pos >= 0) {
 				// include entry in commit
 
-				DirCacheIterator dcTree = treeWalk.getTree(dcIdx,
-						DirCacheIterator.class);
 				FileTreeIterator fTree = treeWalk.getTree(fIdx,
 						FileTreeIterator.class);
 
@@ -339,6 +339,13 @@ private DirCache createTemporaryIndex(ObjectId headId, DirCache index)
 				if (!tracked)
 					break;
 
+				// for an unmerged path, DirCacheBuildIterator will yield 3
+				// entries, we only want to add one
+				if (path.equals(lastAddedFile))
+					continue;
+
+				lastAddedFile = path;
+
 				if (fTree != null) {
 					// create a new DirCacheEntry with data retrieved from disk
 					final DirCacheEntry dcEntry = new DirCacheEntry(path);
@@ -371,15 +378,10 @@ private DirCache createTemporaryIndex(ObjectId headId, DirCache index)
 						}
 					}
 
-					// update index
-					dcEditor.add(new PathEdit(path) {
-						@Override
-						public void apply(DirCacheEntry ent) {
-							ent.copyMetaData(dcEntry);
-						}
-					});
+					// add to existing index
+					existingBuilder.add(dcEntry);
 					// add to temporary in-core index
-					dcBuilder.add(dcEntry);
+					tempBuilder.add(dcEntry);
 
 					if (emptyCommit
 							&& (hTree == null || !hTree.idEqual(fTree) || hTree
@@ -388,9 +390,8 @@ public void apply(DirCacheEntry ent) {
 						// this is a change
 						emptyCommit = false;
 				} else {
-					// if no file exists on disk, remove entry from index and
-					// don't add it to temporary in-core index
-					dcEditor.add(new DeletePath(path));
+					// if no file exists on disk, neither add it to
+					// index nor to temporary in-core index
 
 					if (emptyCommit && hTree != null)
 						// this is a change
@@ -408,8 +409,12 @@ public void apply(DirCacheEntry ent) {
 					dcEntry.setFileMode(hTree.getEntryFileMode());
 
 					// add to temporary in-core index
-					dcBuilder.add(dcEntry);
+					tempBuilder.add(dcEntry);
 				}
+
+				// preserve existing entry in index
+				if (dcTree != null)
+					existingBuilder.add(dcTree.getDirCacheEntry());
 			}
 		}
 
@@ -425,9 +430,9 @@ public void apply(DirCacheEntry ent) {
 			throw new JGitInternalException(JGitText.get().emptyCommit);
 
 		// update index
-		dcEditor.commit();
+		existingBuilder.commit();
 		// finish temporary in-core index used for this commit
-		dcBuilder.finish();
+		tempBuilder.finish();
 		return inCoreIndex;
 	}