/*
* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
* Copyright (C) 2007-2008, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2010, Jens Baumgart <jens.baumgart@sap.com>
* Copyright (C) 2013, Robin Stocker <robin@nibor.org>
* Copyright (C) 2014, Axel Richard <axel.richard@obeo.fr>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.lib;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.StopWalkException;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.submodule.SubmoduleWalk;
import org.eclipse.jgit.submodule.SubmoduleWalk.IgnoreSubmoduleMode;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.EmptyTreeIterator;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.WorkingTreeIterator;
import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
import org.eclipse.jgit.treewalk.filter.IndexDiffFilter;
import org.eclipse.jgit.treewalk.filter.SkipWorkTreeFilter;
import org.eclipse.jgit.treewalk.filter.TreeFilter;
/**
* Compares the index, a tree, and the working directory Ignored files are not
* taken into account. The following information is retrieved:
* <ul>
* <li>added files</li>
* <li>changed files</li>
* <li>removed files</li>
* <li>missing files</li>
* <li>modified files</li>
* <li>conflicting files</li>
* <li>untracked files</li>
* <li>files with assume-unchanged flag</li>
* </ul>
*/
public class IndexDiff {
/**
* Represents the state of the index for a certain path regarding the stages
* - which stages exist for a path and which not (base, ours, theirs).
* <p>
* This is used for figuring out what kind of conflict occurred.
*
* @see IndexDiff#getConflictingStageStates()
* @since 3.0
*/
public static enum StageState {
/**
* Exists in base, but neither in ours nor in theirs.
*/
BOTH_DELETED(1),
/**
* Only exists in ours.
*/
ADDED_BY_US(2),
/**
* Exists in base and ours, but no in theirs.
*/
DELETED_BY_THEM(3),
/**
* Only exists in theirs.
*/
ADDED_BY_THEM(4),
/**
* Exists in base and theirs, but not in ours.
*/
DELETED_BY_US(5),
/**
* Exists in ours and theirs, but not in base.
*/
BOTH_ADDED(6),
/**
* Exists in all stages, content conflict.
*/
BOTH_MODIFIED(7);
private final int stageMask;
private StageState(int stageMask) {
this.stageMask = stageMask;
}
int getStageMask() {
return stageMask;
}
/**
* @return whether there is a "base" stage entry
*/
public boolean hasBase() {
return (stageMask & 1) != 0;
}
/**
* @return whether there is an "ours" stage entry
*/
public boolean hasOurs() {
return (stageMask & 2) != 0;
}
/**
* @return whether there is a "theirs" stage entry
*/
public boolean hasTheirs() {
return (stageMask & 4) != 0;
}
static StageState fromMask(int stageMask) {
// bits represent: theirs, ours, base
switch (stageMask) {
case 1: // 0b001
return BOTH_DELETED;
case 2: // 0b010
return ADDED_BY_US;
case 3: // 0b011
return DELETED_BY_THEM;
case 4: // 0b100
return ADDED_BY_THEM;
case 5: // 0b101
return DELETED_BY_US;
case 6: // 0b110
return BOTH_ADDED;
case 7: // 0b111
return BOTH_MODIFIED;
default:
return null;
}
}
}
private static final class ProgressReportingFilter extends TreeFilter {
private final ProgressMonitor monitor;
private int count = 0;
private int stepSize;
private final int total;
private ProgressReportingFilter(ProgressMonitor monitor, int total) {
this.monitor = monitor;
this.total = total;
stepSize = total / 100;
if (stepSize == 0)
stepSize = 1000;
}
@Override
public boolean shouldBeRecursive() {
return false;
}
@Override
public boolean include(TreeWalk walker)
throws MissingObjectException,
IncorrectObjectTypeException, IOException {
count++;
if (count % stepSize == 0) {
if (count <= total)
monitor.update(stepSize);
if (monitor.isCancelled())
throw StopWalkException.INSTANCE;
}
return true;
}
@Override
public TreeFilter clone() {
throw new IllegalStateException(
"Do not clone this kind of filter: " //$NON-NLS-1$
+ getClass().getName());
}
}
private final static int TREE = 0;
private final static int INDEX = 1;
private final static int WORKDIR = 2;
private final Repository repository;
private final RevTree tree;
private TreeFilter filter = null;
private final WorkingTreeIterator initialWorkingTreeIterator;
private Set<String> added = new HashSet<String>();
private Set<String> changed = new HashSet<String>();
private Set<String> removed = new HashSet<String>();
private Set<String> missing = new HashSet<String>();
private Set<String> modified = new HashSet<String>();
private Set<String> untracked = new HashSet<String>();
private Map<String, StageState> conflicts = new HashMap<String, StageState>();
private Set<String> ignored;
private Set<String> assumeUnchanged;
private DirCache dirCache;
private IndexDiffFilter indexDiffFilter;
private Map<String, IndexDiff> submoduleIndexDiffs = new HashMap<String, IndexDiff>();
private IgnoreSubmoduleMode ignoreSubmoduleMode = null;
private Map<FileMode, Set<String>> fileModes = new HashMap<FileMode, Set<String>>();
/**
* Construct an IndexDiff
*
* @param repository
* @param revstr
* symbolic name e.g. HEAD
* An EmptyTreeIterator is used if <code>revstr</code> cannot be resolved.
* @param workingTreeIterator
* iterator for working directory
* @throws IOException
*/
public IndexDiff(Repository repository, String revstr,
WorkingTreeIterator workingTreeIterator) throws IOException {
this(repository, repository.resolve(revstr), workingTreeIterator);
}
/**
* Construct an Indexdiff
*
* @param repository
* @param objectId
* tree id. If null, an EmptyTreeIterator is used.
* @param workingTreeIterator
* iterator for working directory
* @throws IOException
*/
public IndexDiff(Repository repository, ObjectId objectId,
WorkingTreeIterator workingTreeIterator) throws IOException {
this.repository = repository;
if (objectId != null)
tree = new RevWalk(repository).parseTree(objectId);
else
tree = null;
this.initialWorkingTreeIterator = workingTreeIterator;
}
/**
* @param mode
* defines how modifications in submodules are treated
* @since 3.6
*/
public void setIgnoreSubmoduleMode(IgnoreSubmoduleMode mode) {
this.ignoreSubmoduleMode = mode;
}
/**
* A factory to producing WorkingTreeIterators
* @since 3.6
*/
public interface WorkingTreeIteratorFactory {
/**
* @param repo
* @return a WorkingTreeIterator for repo
*/
public WorkingTreeIterator getWorkingTreeIterator(Repository repo);
}
private WorkingTreeIteratorFactory wTreeIt = new WorkingTreeIteratorFactory() {
public WorkingTreeIterator getWorkingTreeIterator(Repository repo) {
return new FileTreeIterator(repo);
}
};
/**
* Allows higher layers to set the factory for WorkingTreeIterators.
*
* @param wTreeIt
* @since 3.6
*/
public void setWorkingTreeItFactory(WorkingTreeIteratorFactory wTreeIt) {
this.wTreeIt = wTreeIt;
}
/**
* Sets a filter. Can be used e.g. for restricting the tree walk to a set of
* files.
*
* @param filter
*/
public void setFilter(TreeFilter filter) {
this.filter = filter;
}
/**
* Run the diff operation. Until this is called, all lists will be empty.
* Use {@link #diff(ProgressMonitor, int, int, String)} if a progress
* monitor is required.
*
* @return if anything is different between index, tree, and workdir
* @throws IOException
*/
public boolean diff() throws IOException {
return diff(null, 0, 0, ""); //$NON-NLS-1$
}
/**
* 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 {@link #diff()}
* instead. Progress reporting is crude and approximate and only intended
* for informing the user.
*
* @param monitor
* for reporting progress, may be null
* @param estWorkTreeSize
* number or estimated files in the working tree
* @param estIndexSize
* number of estimated entries in the cache
* @param title
*
* @return if anything is different between index, tree, and workdir
* @throws IOException
*/
public boolean diff(final ProgressMonitor monitor, int estWorkTreeSize,
int estIndexSize, final String title)
throws IOException {
dirCache = repository.readDirCache();
TreeWalk treeWalk = new TreeWalk(repository);
treeWalk.setRecursive(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);
Collection<TreeFilter> filters = new ArrayList<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.add(new ProgressReportingFilter(monitor, total));
}
if (filter != null)
filters.add(filter);
filters.add(new SkipWorkTreeFilter(INDEX));
indexDiffFilter = new IndexDiffFilter(INDEX, WORKDIR);
filters.add(indexDiffFilter);
treeWalk.setFilter(AndTreeFilter.create(filters));
fileModes.clear();
while (treeWalk.next()) {
AbstractTreeIterator treeIterator = treeWalk.getTree(TREE,
AbstractTreeIterator.class);
DirCacheIterator dirCacheIterator = treeWalk.getTree(INDEX,
DirCacheIterator.class);
WorkingTreeIterator workingTreeIterator = treeWalk.getTree(WORKDIR,
WorkingTreeIterator.class);
if (dirCacheIterator != null) {
final DirCacheEntry dirCacheEntry = dirCacheIterator
.getDirCacheEntry();
if (dirCacheEntry != null) {
int stage = dirCacheEntry.getStage();
if (stage > 0) {
String path = treeWalk.getPathString();
addConflict(path, stage);
continue;
}
}
}
if (treeIterator != null) {
if (dirCacheIterator != null) {
if (!treeIterator.idEqual(dirCacheIterator)
|| treeIterator.getEntryRawMode()
!= dirCacheIterator.getEntryRawMode()) {
// in repo, in index, content diff => changed
if (!isEntryGitLink(treeIterator)
|| !isEntryGitLink(dirCacheIterator)
|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
changed.add(treeWalk.getPathString());
}
} else {
// in repo, not in index => removed
if (!isEntryGitLink(treeIterator)
|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
removed.add(treeWalk.getPathString());
if (workingTreeIterator != null)
untracked.add(treeWalk.getPathString());
}
} else {
if (dirCacheIterator != null) {
// not in repo, in index => added
if (!isEntryGitLink(dirCacheIterator)
|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
added.add(treeWalk.getPathString());
} else {
// not in repo, not in index => untracked
if (workingTreeIterator != null
&& !workingTreeIterator.isEntryIgnored()) {
untracked.add(treeWalk.getPathString());
}
}
}
if (dirCacheIterator != null) {
if (workingTreeIterator == null) {
// in index, not in workdir => missing
if (!isEntryGitLink(dirCacheIterator)
|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
missing.add(treeWalk.getPathString());
} else {
if (workingTreeIterator.isModified(
dirCacheIterator.getDirCacheEntry(), true,
treeWalk.getObjectReader())) {
// in index, in workdir, content differs => modified
if (!isEntryGitLink(dirCacheIterator) || !isEntryGitLink(workingTreeIterator)
|| (ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL && ignoreSubmoduleMode != IgnoreSubmoduleMode.DIRTY))
modified.add(treeWalk.getPathString());
}
}
}
for (int i = 0; i < treeWalk.getTreeCount(); i++) {
Set<String> values = fileModes.get(treeWalk.getFileMode(i));
String path = treeWalk.getPathString();
if (path != null) {
if (values == null)
values = new HashSet<String>();
values.add(path);
fileModes.put(treeWalk.getFileMode(i), values);
}
}
}
if (ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL) {
IgnoreSubmoduleMode localIgnoreSubmoduleMode = ignoreSubmoduleMode;
SubmoduleWalk smw = SubmoduleWalk.forIndex(repository);
while (smw.next()) {
try {
if (localIgnoreSubmoduleMode == null)
localIgnoreSubmoduleMode = smw.getModulesIgnore();
if (IgnoreSubmoduleMode.ALL
.equals(localIgnoreSubmoduleMode))
continue;
} catch (ConfigInvalidException e) {
IOException e1 = new IOException(
"Found invalid ignore param for submodule "
+ smw.getPath());
e1.initCause(e);
throw e1;
}
Repository subRepo = smw.getRepository();
if (subRepo != null) {
ObjectId subHead = subRepo.resolve("HEAD"); //$NON-NLS-1$
if (subHead != null && !subHead.equals(smw.getObjectId()))
modified.add(smw.getPath());
else if (ignoreSubmoduleMode != IgnoreSubmoduleMode.DIRTY) {
IndexDiff smid = submoduleIndexDiffs.get(smw.getPath());
if (smid == null) {
smid = new IndexDiff(subRepo, smw.getObjectId(),
wTreeIt.getWorkingTreeIterator(subRepo));
submoduleIndexDiffs.put(smw.getPath(), smid);
}
if (smid.diff()) {
if (ignoreSubmoduleMode == IgnoreSubmoduleMode.UNTRACKED
&& smid.getAdded().isEmpty()
&& smid.getChanged().isEmpty()
&& smid.getConflicting().isEmpty()
&& smid.getMissing().isEmpty()
&& smid.getModified().isEmpty()
&& smid.getRemoved().isEmpty()) {
continue;
}
modified.add(smw.getPath());
}
}
}
}
}
// consume the remaining work
if (monitor != null)
monitor.endTask();
ignored = indexDiffFilter.getIgnoredPaths();
if (added.isEmpty() && changed.isEmpty() && removed.isEmpty()
&& missing.isEmpty() && modified.isEmpty()
&& untracked.isEmpty())
return false;
else
return true;
}
private boolean isEntryGitLink(AbstractTreeIterator ti) {
return ((ti != null) && (ti.getEntryRawMode() == FileMode.GITLINK
.getBits()));
}
private void addConflict(String path, int stage) {
StageState existingStageStates = conflicts.get(path);
byte stageMask = 0;
if (existingStageStates != null)
stageMask |= existingStageStates.getStageMask();
// stage 1 (base) should be shifted 0 times
int shifts = stage - 1;
stageMask |= (1 << shifts);
StageState stageState = StageState.fromMask(stageMask);
conflicts.put(path, stageState);
}
/**
* @return list of files added to the index, not in the tree
*/
public Set<String> getAdded() {
return added;
}
/**
* @return list of files changed from tree to index
*/
public Set<String> getChanged() {
return changed;
}
/**
* @return list of files removed from index, but in tree
*/
public Set<String> getRemoved() {
return removed;
}
/**
* @return list of files in index, but not filesystem
*/
public Set<String> getMissing() {
return missing;
}
/**
* @return list of files modified on disk relative to the index
*/
public Set<String> getModified() {
return modified;
}
/**
* @return list of files that are not ignored, and not in the index.
*/
public Set<String> getUntracked() {
return untracked;
}
/**
* @return list of files that are in conflict, corresponds to the keys of
* {@link #getConflictingStageStates()}
*/
public Set<String> getConflicting() {
return conflicts.keySet();
}
/**
* @return the map from each path of {@link #getConflicting()} to its
* corresponding {@link StageState}
* @since 3.0
*/
public Map<String, StageState> getConflictingStageStates() {
return conflicts;
}
/**
* The method returns the list of ignored files and folders. Only the root
* folder of an ignored folder hierarchy is reported. If a/b/c is listed in
* the .gitignore then you should not expect a/b/c/d/e/f to be reported
* here. Only a/b/c will be reported. Furthermore only ignored files /
* folders are returned that are NOT in the index.
*
* @return list of files / folders that are ignored
*/
public Set<String> getIgnoredNotInIndex() {
return ignored;
}
/**
* @return list of files with the flag assume-unchanged
*/
public Set<String> getAssumeUnchanged() {
if (assumeUnchanged == null) {
HashSet<String> unchanged = new HashSet<String>();
for (int i = 0; i < dirCache.getEntryCount(); i++)
if (dirCache.getEntry(i).isAssumeValid())
unchanged.add(dirCache.getEntry(i).getPathString());
assumeUnchanged = unchanged;
}
return assumeUnchanged;
}
/**
* @return list of folders containing only untracked files/folders
*/
public Set<String> getUntrackedFolders() {
return ((indexDiffFilter == null) ? Collections.<String> emptySet()
: new HashSet<String>(indexDiffFilter.getUntrackedFolders()));
}
/**
* Get the file mode of the given path in the index
*
* @param path
* @return file mode
*/
public FileMode getIndexMode(final String path) {
final DirCacheEntry entry = dirCache.getEntry(path);
return entry != null ? entry.getFileMode() : FileMode.MISSING;
}
/**
* Get the list of paths that IndexDiff has detected to differ and have the
* given file mode
*
* @param mode
* @return the list of paths that IndexDiff has detected to differ and have
* the given file mode
* @since 3.6
*/
public Set<String> getPathsWithIndexMode(final FileMode mode) {
Set<String> paths = fileModes.get(mode);
if (paths == null)
paths = new HashSet<String>();
return paths;
}
}