ResetCommand: Correctly reset unmerged paths in resetIndexForPaths

The previous implementation used a PathEdit, which does not reset the
stage of the entry.

Bug: 391860
Change-Id: If26d3a35abfee85424ad69de724f06a28b6e9efb
Signed-off-by: Chris Aniszczyk <zx@twitter.com>

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

@@ -58,9 +58,11 @@ import org.eclipse.jgit.api.ResetCommand.ResetType;
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
 import org.eclipse.jgit.dircache.DirCache;
+import org.eclipse.jgit.dircache.DirCacheBuilder;
 import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.errors.AmbiguousObjectException;
 import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.RepositoryTestCase;
 import org.eclipse.jgit.revwalk.RevCommit;
@@ -341,6 +343,36 @@ public class ResetCommandTest extends RepositoryTestCase {
 		assertFalse(inIndex(untrackedFile.getName()));
 	}
 
+	@Test
+	public void testPathsResetWithUnmerged() throws Exception {
+		setupRepository();
+
+		String file = "a.txt";
+		writeTrashFile(file, "data");
+
+		git.add().addFilepattern(file).call();
+		git.commit().setMessage("commit").call();
+
+		DirCache index = db.lockDirCache();
+		DirCacheBuilder builder = index.builder();
+		builder.add(createEntry(file, FileMode.REGULAR_FILE, 1, ""));
+		builder.add(createEntry(file, FileMode.REGULAR_FILE, 2, ""));
+		builder.add(createEntry(file, FileMode.REGULAR_FILE, 3, ""));
+		builder.add(createEntry("b.txt", FileMode.REGULAR_FILE));
+		assertTrue(builder.commit());
+
+		assertEquals("[a.txt, mode:100644, stage:1]"
+				+ "[a.txt, mode:100644, stage:2]"
+				+ "[a.txt, mode:100644, stage:3]"
+				+ "[b.txt, mode:100644]",
+				indexState(0));
+
+		git.reset().addPath(file).call();
+
+		assertEquals("[a.txt, mode:100644]" + "[b.txt, mode:100644]",
+				indexState(0));
+	}
+
 	@Test
 	public void testHardResetOnTag() throws Exception {
 		setupRepository();

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

@@ -51,6 +51,8 @@ import org.eclipse.jgit.api.errors.CheckoutConflictException;
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
 import org.eclipse.jgit.dircache.DirCache;
+import org.eclipse.jgit.dircache.DirCacheBuildIterator;
+import org.eclipse.jgit.dircache.DirCacheBuilder;
 import org.eclipse.jgit.dircache.DirCacheCheckout;
 import org.eclipse.jgit.dircache.DirCacheEditor;
 import org.eclipse.jgit.dircache.DirCacheEditor.DeletePath;
@@ -59,7 +61,6 @@ import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.dircache.DirCacheIterator;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.Constants;
-import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.RefUpdate;
@@ -276,44 +277,30 @@ public class ResetCommand extends GitCommand<Ref> {
 
 	private void resetIndexForPaths(RevCommit commit) {
 		DirCache dc = null;
-		final DirCacheEditor edit;
 		try {
 			dc = repo.lockDirCache();
-			edit = dc.editor();
+			DirCacheBuilder builder = dc.builder();
 
 			final TreeWalk tw = new TreeWalk(repo);
-			tw.addTree(new DirCacheIterator(dc));
+			tw.addTree(new DirCacheBuildIterator(builder));
 			tw.addTree(commit.getTree());
 			tw.setFilter(PathFilterGroup.createFromStrings(filepaths));
 			tw.setRecursive(true);
 
 			while (tw.next()) {
-				final String path = tw.getPathString();
-				// DirCacheIterator dci = tw.getTree(0, DirCacheIterator.class);
 				final CanonicalTreeParser tree = tw.getTree(1,
 						CanonicalTreeParser.class);
-				if (tree == null)
-					// file is not in the commit, remove from index
-					edit.add(new DirCacheEditor.DeletePath(path));
-				else { // revert index to commit
-					// it seams that there is concurrent access to tree
-					// variable, therefore we need to keep references to
-					// entryFileMode and entryObjectId in local
-					// variables
-					final FileMode entryFileMode = tree.getEntryFileMode();
-					final ObjectId entryObjectId = tree.getEntryObjectId();
-					edit.add(new DirCacheEditor.PathEdit(path) {
-						@Override
-						public void apply(DirCacheEntry ent) {
-							ent.setFileMode(entryFileMode);
-							ent.setObjectId(entryObjectId);
-							ent.setLastModified(0);
-						}
-					});
+				// only keep file in index if it's in the commit
+				if (tree != null) {
+				    // revert index to commit
+					DirCacheEntry entry = new DirCacheEntry(tw.getRawPath());
+					entry.setFileMode(tree.getEntryFileMode());
+					entry.setObjectId(tree.getEntryObjectId());
+					builder.add(entry);
 				}
 			}
 
-			edit.commit();
+			builder.commit();
 		} catch (IOException e) {
 			throw new RuntimeException(e);
 		} finally {