示例#1
0
        ObjectId WriteWorkingDirectoryTree(RevTree headTree, DirCache index)
        {
            DirCache        dc = DirCache.NewInCore();
            DirCacheBuilder cb = dc.Builder();

            ObjectInserter oi = _repo.NewObjectInserter();

            try {
                TreeWalk tw = new TreeWalk(_repo);
                tw.Reset();
                tw.AddTree(new FileTreeIterator(_repo));
                tw.AddTree(headTree);
                tw.AddTree(new DirCacheIterator(index));

                while (tw.Next())
                {
                    // Ignore untracked files
                    if (tw.IsSubtree)
                    {
                        tw.EnterSubtree();
                    }
                    else if (tw.GetFileMode(0) != NGit.FileMode.MISSING && (tw.GetFileMode(1) != NGit.FileMode.MISSING || tw.GetFileMode(2) != NGit.FileMode.MISSING))
                    {
                        WorkingTreeIterator f            = tw.GetTree <WorkingTreeIterator>(0);
                        DirCacheIterator    dcIter       = tw.GetTree <DirCacheIterator>(2);
                        DirCacheEntry       currentEntry = dcIter.GetDirCacheEntry();
                        DirCacheEntry       ce           = new DirCacheEntry(tw.PathString);
                        if (!f.IsModified(currentEntry, true))
                        {
                            ce.SetLength(currentEntry.Length);
                            ce.LastModified = currentEntry.LastModified;
                            ce.FileMode     = currentEntry.FileMode;
                            ce.SetObjectId(currentEntry.GetObjectId());
                        }
                        else
                        {
                            long sz = f.GetEntryLength();
                            ce.SetLength(sz);
                            ce.LastModified = f.GetEntryLastModified();
                            ce.FileMode     = f.EntryFileMode;
                            var data = f.OpenEntryStream();
                            try {
                                ce.SetObjectId(oi.Insert(Constants.OBJ_BLOB, sz, data));
                            } finally {
                                data.Close();
                            }
                        }
                        cb.Add(ce);
                    }
                }

                cb.Finish();
                return(dc.WriteTree(oi));
            } finally {
                oi.Release();
            }
        }
示例#2
0
        public override bool Include(TreeWalk walker)
        {
            DirCacheIterator i = walker.GetTree <DirCacheIterator>(treeIdx);

            if (i == null)
            {
                return(true);
            }
            DirCacheEntry e = i.GetDirCacheEntry();

            return(e == null || !e.IsSkipWorkTree);
        }
示例#3
0
        /// <exception cref="System.IO.IOException"></exception>
        private void ResetIndex(RevCommit commit)
        {
            DirCache dc   = repo.LockDirCache();
            TreeWalk walk = null;

            try
            {
                DirCacheEditor editor = dc.Editor();
                walk = new TreeWalk(repo);
                walk.AddTree(commit.Tree);
                walk.AddTree(new DirCacheIterator(dc));
                walk.Recursive = true;
                while (walk.Next())
                {
                    AbstractTreeIterator cIter = walk.GetTree <AbstractTreeIterator>(0);
                    if (cIter == null)
                    {
                        editor.Add(new DirCacheEditor.DeletePath(walk.PathString));
                        continue;
                    }
                    DirCacheEntry entry = new DirCacheEntry(walk.RawPath);
                    entry.FileMode = cIter.EntryFileMode;
                    entry.SetObjectIdFromRaw(cIter.IdBuffer, cIter.IdOffset);
                    DirCacheIterator dcIter = walk.GetTree <DirCacheIterator>(1);
                    if (dcIter != null && dcIter.IdEqual(cIter))
                    {
                        DirCacheEntry indexEntry = dcIter.GetDirCacheEntry();
                        entry.LastModified = indexEntry.LastModified;
                        entry.SetLength(indexEntry.Length);
                    }
                    editor.Add(new _PathEdit_356(entry, entry));
                }
                editor.Commit();
            }
            finally
            {
                dc.Unlock();
                if (walk != null)
                {
                    walk.Release();
                }
            }
        }
示例#4
0
        public static List <string> GetConflictedFiles(NGit.Repository repo)
        {
            List <string> list     = new List <string> ();
            TreeWalk      treeWalk = new TreeWalk(repo);

            treeWalk.Reset();
            treeWalk.Recursive = true;
            DirCache dc = repo.ReadDirCache();

            treeWalk.AddTree(new DirCacheIterator(dc));
            while (treeWalk.Next())
            {
                DirCacheIterator dirCacheIterator = treeWalk.GetTree <DirCacheIterator>(0);
                var ce = dirCacheIterator.GetDirCacheEntry();
                if (ce != null && ce.Stage == 1)
                {
                    list.Add(ce.PathString);
                }
            }
            return(list);
        }
        private GitFileStatus GetFileStatus(TreeWalk treeWalk)
        {
            AbstractTreeIterator treeIterator        = treeWalk.GetTree <AbstractTreeIterator>(TREE);
            DirCacheIterator     dirCacheIterator    = treeWalk.GetTree <DirCacheIterator>(INDEX);
            WorkingTreeIterator  workingTreeIterator = treeWalk.GetTree <WorkingTreeIterator>(WORKDIR);

            if (dirCacheIterator != null)
            {
                DirCacheEntry dirCacheEntry = dirCacheIterator.GetDirCacheEntry();
                if (dirCacheEntry != null && dirCacheEntry.Stage > 0)
                {
                    return(GitFileStatus.Conflict);
                }

                if (workingTreeIterator == null)
                {
                    // in index, not in workdir => missing
                    return(GitFileStatus.Deleted);
                }
                else
                {
                    if (workingTreeIterator.IsModified(dirCacheIterator.GetDirCacheEntry(), true))
                    {
                        // in index, in workdir, content differs => modified
                        return(GitFileStatus.Modified);
                    }
                }
            }
            if (treeIterator != null)
            {
                if (dirCacheIterator != null)
                {
                    if (!treeIterator.IdEqual(dirCacheIterator) || treeIterator.EntryRawMode != dirCacheIterator.EntryRawMode)
                    {
                        // in repo, in index, content diff => changed
                        return(GitFileStatus.Staged);
                    }
                }
                else
                {
                    return(GitFileStatus.Removed);
                }
            }
            else
            {
                if (dirCacheIterator != null)
                {
                    // not in repo, in index => added
                    return(GitFileStatus.Added);
                }
                else
                {
                    // not in repo, not in index => untracked
                    if (workingTreeIterator != null)
                    {
                        return(!workingTreeIterator.IsEntryIgnored() ? GitFileStatus.New : GitFileStatus.Ignored);
                    }
                }
            }

            return(GitFileStatus.NotControlled);
        }
        /// <exception cref="NGit.Errors.MissingObjectException"></exception>
        /// <exception cref="NGit.Errors.IncorrectObjectTypeException"></exception>
        /// <exception cref="System.IO.IOException"></exception>
        public override bool Include(TreeWalk tw)
        {
            int    cnt  = tw.TreeCount;
            int    wm   = tw.GetRawMode(workingTree);
            string path = tw.PathString;

            if (!tw.PostOrderTraversal)
            {
                // detect untracked Folders
                // Whenever we enter a folder in the workingtree assume it will
                // contain only untracked files and add it to
                // untrackedParentFolders. If we later find tracked files we will
                // remove it from this list
                if (FileMode.TREE.Equals(wm))
                {
                    // Clean untrackedParentFolders. This potentially moves entries
                    // from untrackedParentFolders to untrackedFolders
                    CopyUntrackedFolders(path);
                    // add the folder we just entered to untrackedParentFolders
                    untrackedParentFolders.AddFirst(path);
                }
                // detect untracked Folders
                // Whenever we see a tracked file we know that all of its parent
                // folders do not belong into untrackedParentFolders anymore. Clean
                // it.
                for (int i = 0; i < cnt; i++)
                {
                    int rmode = tw.GetRawMode(i);
                    if (i != workingTree && rmode != 0 && FileMode.TREE.Equals(rmode))
                    {
                        untrackedParentFolders.Clear();
                        break;
                    }
                }
            }
            // If the working tree file doesn't exist, it does exist for at least
            // one other so include this difference.
            if (wm == 0)
            {
                return(true);
            }
            // If the path does not appear in the DirCache and its ignored
            // we can avoid returning a result here, but only if its not in any
            // other tree.
            int dm = tw.GetRawMode(dirCache);
            WorkingTreeIterator wi = WorkingTree(tw);

            if (dm == 0)
            {
                if (honorIgnores && wi.IsEntryIgnored())
                {
                    ignoredPaths.AddItem(wi.EntryPathString);
                    int i = 0;
                    for (; i < cnt; i++)
                    {
                        if (i == dirCache || i == workingTree)
                        {
                            continue;
                        }
                        if (tw.GetRawMode(i) != 0)
                        {
                            break;
                        }
                    }
                    // If i is cnt then the path does not appear in any other tree,
                    // and this working tree entry can be safely ignored.
                    return(i == cnt ? false : true);
                }
                else
                {
                    // In working tree and not ignored, and not in DirCache.
                    return(true);
                }
            }
            // Always include subtrees as WorkingTreeIterator cannot provide
            // efficient elimination of unmodified subtrees.
            if (tw.IsSubtree)
            {
                return(true);
            }
            // Try the inexpensive comparisons between index and all real trees
            // first. Only if we don't find a diff here we have to bother with
            // the working tree
            for (int i_1 = 0; i_1 < cnt; i_1++)
            {
                if (i_1 == dirCache || i_1 == workingTree)
                {
                    continue;
                }
                if (tw.GetRawMode(i_1) != dm || !tw.IdEqual(i_1, dirCache))
                {
                    return(true);
                }
            }
            // Only one chance left to detect a diff: between index and working
            // tree. Make use of the WorkingTreeIterator#isModified() method to
            // avoid computing SHA1 on filesystem content if not really needed.
            DirCacheIterator di = tw.GetTree <DirCacheIterator>(dirCache);

            return(wi.IsModified(di.GetDirCacheEntry(), true));
        }
示例#7
0
        /// <summary>
        /// Run the diff operation. Until this is called, all lists will be empty
        /// </summary>
        /// <returns>true if anything is different between index, tree, and workdir</returns>
        private void UpdateDirectory(IEnumerable <string> paths, bool recursive)
        {
            RevWalk  rw     = new RevWalk(Repository);
            ObjectId id     = Repository.Resolve(Constants.HEAD);
            var      commit = id != null?rw.ParseCommit(id) : null;

            TreeWalk treeWalk = new TreeWalk(Repository);

            treeWalk.Reset();
            treeWalk.Recursive = false;

            if (commit != null)
            {
                treeWalk.AddTree(commit.Tree);
            }
            else
            {
                treeWalk.AddTree(new EmptyTreeIterator());
            }

            DirCache dc = Repository.ReadDirCache();

            treeWalk.AddTree(new DirCacheIterator(dc));

            FileTreeIterator workTree = new FileTreeIterator(Repository.WorkTree, Repository.FileSystem, WorkingTreeOptions.KEY.Parse(Repository.GetConfig()));

            treeWalk.AddTree(workTree);

            List <TreeFilter> filters = new List <TreeFilter> ();

            filters.Add(new SkipWorkTreeFilter(1));

            var pathFilters = paths.Where(p => p != ".").Select(p => PathFilter.Create(p)).ToArray();

            if (pathFilters.Length > 1)
            {
                filters.Add(OrTreeFilter.Create(pathFilters));                   // Use an OR to join all path filters
            }
            else if (pathFilters.Length == 1)
            {
                filters.Add(pathFilters[0]);
            }

            if (filters.Count > 1)
            {
                treeWalk.Filter = AndTreeFilter.Create(filters);
            }
            else
            {
                treeWalk.Filter = filters[0];
            }

            while (treeWalk.Next())
            {
                AbstractTreeIterator treeIterator        = treeWalk.GetTree <AbstractTreeIterator>(0);
                DirCacheIterator     dirCacheIterator    = treeWalk.GetTree <DirCacheIterator>(1);
                WorkingTreeIterator  workingTreeIterator = treeWalk.GetTree <WorkingTreeIterator>(2);
                NGit.FileMode        fileModeTree        = treeWalk.GetFileMode(0);

                if (treeWalk.IsSubtree)
                {
                    treeWalk.EnterSubtree();
                    continue;
                }

                int stage = dirCacheIterator != null?dirCacheIterator.GetDirCacheEntry().Stage : 0;

                if (stage > 1)
                {
                    continue;
                }
                else if (stage == 1)
                {
                    MergeConflict.Add(dirCacheIterator.EntryPathString);
                    changesExist = true;
                    continue;
                }

                if (treeIterator != null)
                {
                    if (dirCacheIterator != null)
                    {
                        if (!treeIterator.EntryObjectId.Equals(dirCacheIterator.EntryObjectId))
                        {
                            // in repo, in index, content diff => changed
                            Modified.Add(dirCacheIterator.EntryPathString);
                            changesExist = true;
                        }
                    }
                    else
                    {
                        // in repo, not in index => removed
                        if (!fileModeTree.Equals(NGit.FileMode.TYPE_TREE))
                        {
                            Removed.Add(treeIterator.EntryPathString);
                            changesExist = true;
                        }
                    }
                }
                else
                {
                    if (dirCacheIterator != null)
                    {
                        // not in repo, in index => added
                        Added.Add(dirCacheIterator.EntryPathString);
                        changesExist = true;
                    }
                    else
                    {
                        // not in repo, not in index => untracked
                        if (workingTreeIterator != null && !workingTreeIterator.IsEntryIgnored())
                        {
                            Untracked.Add(workingTreeIterator.EntryPathString);
                            changesExist = true;
                        }
                    }
                }
                if (dirCacheIterator != null)
                {
                    if (workingTreeIterator == null)
                    {
                        // in index, not in workdir => missing
                        Missing.Add(dirCacheIterator.EntryPathString);
                        changesExist = true;
                    }
                    else
                    {
                        // Workaround to file time resolution issues
                        long itime = dirCacheIterator.GetDirCacheEntry().LastModified;
                        long ftime = workingTreeIterator.GetEntryLastModified();
                        if (itime / 1000 != ftime / 1000)
                        {
                            if (!dirCacheIterator.IdEqual(workingTreeIterator))
                            {
                                // in index, in workdir, content differs => modified
                                Modified.Add(dirCacheIterator.EntryPathString);
                                changesExist = true;
                            }
                        }
                    }
                }
            }
        }
示例#8
0
文件: IndexDiff.cs 项目: shoff/ngit
        /// <summary>Run the diff operation.</summary>
        /// <remarks>
        /// Run the diff operation. Until this is called, all lists will be empty.
        /// <p>
        /// The operation may be aborted by the progress monitor. In that event it
        /// will report what was found before the cancel operation was detected.
        /// Callers should ignore the result if monitor.isCancelled() is true. If a
        /// progress monitor is not needed, callers should use
        /// <see cref="Diff()">Diff()</see>
        /// instead. Progress reporting is crude and approximate and only intended
        /// for informing the user.
        /// </remarks>
        /// <param name="monitor">for reporting progress, may be null</param>
        /// <param name="estWorkTreeSize">number or estimated files in the working tree</param>
        /// <param name="estIndexSize">number of estimated entries in the cache</param>
        /// <param name="title"></param>
        /// <returns>if anything is different between index, tree, and workdir</returns>
        /// <exception cref="System.IO.IOException">System.IO.IOException</exception>
        public virtual bool Diff(ProgressMonitor monitor, int estWorkTreeSize, int estIndexSize
                                 , string title)
        {
            dirCache = repository.ReadDirCache();
            TreeWalk treeWalk = new TreeWalk(repository);

            treeWalk.Recursive = true;
            // add the trees (tree, dirchache, workdir)
            if (tree != null)
            {
                treeWalk.AddTree(tree);
            }
            else
            {
                treeWalk.AddTree(new EmptyTreeIterator());
            }
            treeWalk.AddTree(new DirCacheIterator(dirCache));
            treeWalk.AddTree(initialWorkingTreeIterator);
            ICollection <TreeFilter> filters = new AList <TreeFilter>(4);

            if (monitor != null)
            {
                // Get the maximum size of the work tree and index
                // and add some (quite arbitrary)
                if (estIndexSize == 0)
                {
                    estIndexSize = dirCache.GetEntryCount();
                }
                int total = Math.Max(estIndexSize * 10 / 9, estWorkTreeSize * 10 / 9);
                monitor.BeginTask(title, total);
                filters.AddItem(new IndexDiff.ProgressReportingFilter(monitor, total));
            }
            if (filter != null)
            {
                filters.AddItem(filter);
            }
            filters.AddItem(new SkipWorkTreeFilter(INDEX));
            filters.AddItem(new IndexDiffFilter(INDEX, WORKDIR));
            treeWalk.Filter = AndTreeFilter.Create(filters);
            while (treeWalk.Next())
            {
                AbstractTreeIterator treeIterator        = treeWalk.GetTree <AbstractTreeIterator>(TREE);
                DirCacheIterator     dirCacheIterator    = treeWalk.GetTree <DirCacheIterator>(INDEX);
                WorkingTreeIterator  workingTreeIterator = treeWalk.GetTree <WorkingTreeIterator>(WORKDIR
                                                                                                  );
                if (dirCacheIterator != null)
                {
                    DirCacheEntry dirCacheEntry = dirCacheIterator.GetDirCacheEntry();
                    if (dirCacheEntry != null && dirCacheEntry.Stage > 0)
                    {
                        conflicts.AddItem(treeWalk.PathString);
                        continue;
                    }
                }
                if (treeIterator != null)
                {
                    if (dirCacheIterator != null)
                    {
                        if (!treeIterator.IdEqual(dirCacheIterator) || treeIterator.EntryRawMode != dirCacheIterator
                            .EntryRawMode)
                        {
                            // in repo, in index, content diff => changed
                            changed.AddItem(treeWalk.PathString);
                        }
                    }
                    else
                    {
                        // in repo, not in index => removed
                        removed.AddItem(treeWalk.PathString);
                        if (workingTreeIterator != null)
                        {
                            untracked.AddItem(treeWalk.PathString);
                        }
                    }
                }
                else
                {
                    if (dirCacheIterator != null)
                    {
                        // not in repo, in index => added
                        added.AddItem(treeWalk.PathString);
                    }
                    else
                    {
                        // not in repo, not in index => untracked
                        if (workingTreeIterator != null && !workingTreeIterator.IsEntryIgnored())
                        {
                            untracked.AddItem(treeWalk.PathString);
                        }
                    }
                }
                if (dirCacheIterator != null)
                {
                    if (workingTreeIterator == null)
                    {
                        // in index, not in workdir => missing
                        missing.AddItem(treeWalk.PathString);
                    }
                    else
                    {
                        if (workingTreeIterator.IsModified(dirCacheIterator.GetDirCacheEntry(), true))
                        {
                            // in index, in workdir, content differs => modified
                            modified.AddItem(treeWalk.PathString);
                        }
                    }
                }
            }
            // consume the remaining work
            if (monitor != null)
            {
                monitor.EndTask();
            }
            if (added.IsEmpty() && changed.IsEmpty() && removed.IsEmpty() && missing.IsEmpty(
                    ) && modified.IsEmpty() && untracked.IsEmpty())
            {
                return(false);
            }
            else
            {
                return(true);
            }
        }
示例#9
0
        /// <summary>
        /// Stash the contents on the working directory and index in separate commits
        /// and reset to the current HEAD commit.
        /// </summary>
        /// <remarks>
        /// Stash the contents on the working directory and index in separate commits
        /// and reset to the current HEAD commit.
        /// </remarks>
        /// <returns>stashed commit or null if no changes to stash</returns>
        /// <exception cref="NGit.Api.Errors.GitAPIException">NGit.Api.Errors.GitAPIException
        ///     </exception>
        public override RevCommit Call()
        {
            CheckCallable();
            Ref          head   = GetHead();
            ObjectReader reader = repo.NewObjectReader();

            try
            {
                RevCommit      headCommit = ParseCommit(reader, head.GetObjectId());
                DirCache       cache      = repo.LockDirCache();
                ObjectInserter inserter   = repo.NewObjectInserter();
                ObjectId       commitId;
                try
                {
                    TreeWalk treeWalk = new TreeWalk(reader);
                    treeWalk.Recursive = true;
                    treeWalk.AddTree(headCommit.Tree);
                    treeWalk.AddTree(new DirCacheIterator(cache));
                    treeWalk.AddTree(new FileTreeIterator(repo));
                    treeWalk.Filter = AndTreeFilter.Create(new SkipWorkTreeFilter(1), new IndexDiffFilter
                                                               (1, 2));
                    // Return null if no local changes to stash
                    if (!treeWalk.Next())
                    {
                        return(null);
                    }
                    MutableObjectId id = new MutableObjectId();
                    IList <DirCacheEditor.PathEdit> wtEdits = new AList <DirCacheEditor.PathEdit>();
                    IList <string> wtDeletes = new AList <string>();
                    do
                    {
                        AbstractTreeIterator headIter  = treeWalk.GetTree <AbstractTreeIterator>(0);
                        DirCacheIterator     indexIter = treeWalk.GetTree <DirCacheIterator>(1);
                        WorkingTreeIterator  wtIter    = treeWalk.GetTree <WorkingTreeIterator>(2);
                        if (headIter != null && indexIter != null && wtIter != null)
                        {
                            if (!indexIter.GetDirCacheEntry().IsMerged())
                            {
                                throw new UnmergedPathsException(new UnmergedPathException(indexIter.GetDirCacheEntry
                                                                                               ()));
                            }
                            if (wtIter.IdEqual(indexIter) || wtIter.IdEqual(headIter))
                            {
                                continue;
                            }
                            treeWalk.GetObjectId(id, 0);
                            DirCacheEntry entry = new DirCacheEntry(treeWalk.RawPath);
                            entry.SetLength(wtIter.GetEntryLength());
                            entry.LastModified = wtIter.GetEntryLastModified();
                            entry.FileMode     = wtIter.EntryFileMode;
                            long        contentLength = wtIter.GetEntryContentLength();
                            InputStream @in           = wtIter.OpenEntryStream();
                            try
                            {
                                entry.SetObjectId(inserter.Insert(Constants.OBJ_BLOB, contentLength, @in));
                            }
                            finally
                            {
                                @in.Close();
                            }
                            wtEdits.AddItem(new _PathEdit_273(entry, entry));
                        }
                        else
                        {
                            if (indexIter == null)
                            {
                                wtDeletes.AddItem(treeWalk.PathString);
                            }
                            else
                            {
                                if (wtIter == null && headIter != null)
                                {
                                    wtDeletes.AddItem(treeWalk.PathString);
                                }
                            }
                        }
                    }while (treeWalk.Next());
                    string branch = Repository.ShortenRefName(head.GetTarget().GetName());
                    // Commit index changes
                    NGit.CommitBuilder builder = CreateBuilder(headCommit);
                    builder.TreeId  = cache.WriteTree(inserter);
                    builder.Message = MessageFormat.Format(indexMessage, branch, headCommit.Abbreviate
                                                               (7).Name, headCommit.GetShortMessage());
                    ObjectId indexCommit = inserter.Insert(builder);
                    // Commit working tree changes
                    if (!wtEdits.IsEmpty() || !wtDeletes.IsEmpty())
                    {
                        DirCacheEditor editor = cache.Editor();
                        foreach (DirCacheEditor.PathEdit edit in wtEdits)
                        {
                            editor.Add(edit);
                        }
                        foreach (string path in wtDeletes)
                        {
                            editor.Add(new DirCacheEditor.DeletePath(path));
                        }
                        editor.Finish();
                    }
                    builder.AddParentId(indexCommit);
                    builder.Message = MessageFormat.Format(workingDirectoryMessage, branch, headCommit
                                                           .Abbreviate(7).Name, headCommit.GetShortMessage());
                    builder.TreeId = cache.WriteTree(inserter);
                    commitId       = inserter.Insert(builder);
                    inserter.Flush();
                    UpdateStashRef(commitId, builder.Author, builder.Message);
                }
                finally
                {
                    inserter.Release();
                    cache.Unlock();
                }
                // Hard reset to HEAD
                new ResetCommand(repo).SetMode(ResetCommand.ResetType.HARD).Call();
                // Return stashed commit
                return(ParseCommit(reader, commitId));
            }
            catch (IOException e)
            {
                throw new JGitInternalException(JGitText.Get().stashFailed, e);
            }
            finally
            {
                reader.Release();
            }
        }
示例#10
0
        /// <exception cref="NGit.Errors.MissingObjectException"></exception>
        /// <exception cref="NGit.Errors.IncorrectObjectTypeException"></exception>
        /// <exception cref="System.IO.IOException"></exception>
        public override bool Include(TreeWalk tw)
        {
            // If the working tree file doesn't exist, it does exist for at least
            // one other so include this difference.
            int wm = tw.GetRawMode(workingTree);

            if (wm == 0)
            {
                return(true);
            }
            // If the path does not appear in the DirCache and its ignored
            // we can avoid returning a result here, but only if its not in any
            // other tree.
            int cnt = tw.TreeCount;
            int dm  = tw.GetRawMode(dirCache);

            if (dm == 0)
            {
                if (honorIgnores && WorkingTree(tw).IsEntryIgnored())
                {
                    int i = 0;
                    for (; i < cnt; i++)
                    {
                        if (i == dirCache || i == workingTree)
                        {
                            continue;
                        }
                        if (tw.GetRawMode(i) != 0)
                        {
                            break;
                        }
                    }
                    // If i is cnt then the path does not appear in any other tree,
                    // and this working tree entry can be safely ignored.
                    return(i == cnt ? false : true);
                }
                else
                {
                    // In working tree and not ignored, and not in DirCache.
                    return(true);
                }
            }
            // Always include subtrees as WorkingTreeIterator cannot provide
            // efficient elimination of unmodified subtrees.
            if (tw.IsSubtree)
            {
                return(true);
            }
            // Try the inexpensive comparisons between index and all real trees
            // first. Only if we don't find a diff here we have to bother with
            // the working tree
            for (int i_1 = 0; i_1 < cnt; i_1++)
            {
                if (i_1 == dirCache || i_1 == workingTree)
                {
                    continue;
                }
                if (tw.GetRawMode(i_1) != dm || !tw.IdEqual(i_1, dirCache))
                {
                    return(true);
                }
            }
            // Only one chance left to detect a diff: between index and working
            // tree. Make use of the WorkingTreeIterator#isModified() method to
            // avoid computing SHA1 on filesystem content if not really needed.
            WorkingTreeIterator wi = WorkingTree(tw);
            DirCacheIterator    di = tw.GetTree <DirCacheIterator>(dirCache);

            return(wi.IsModified(di.GetDirCacheEntry(), true));
        }