/*
* Copyright (C) 2011-2013, Chris Aniszczyk <caniszczyk@gmail.com>
* 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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package org.eclipse.jgit.api;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Collection;
import java.util.LinkedList;
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.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryState;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.treewalk.EmptyTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
/**
* A class used to execute a {@code Reset} command. It has setters for all
* supported options and arguments of this command and a {@link #call()} method
* to finally execute the command. Each instance of this class should only be
* used for one invocation of the command (means: one call to {@link #call()})
*
* @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-reset.html"
* >Git documentation about Reset</a>
*/
public class ResetCommand extends GitCommand<Ref> {
/**
* Kind of reset
*/
public enum ResetType {
/**
* Just change the ref, the index and workdir are not changed.
*/
SOFT,
/**
* Change the ref and the index, the workdir is not changed.
*/
MIXED,
/**
* Change the ref, the index and the workdir
*/
HARD,
/**
* Resets the index and updates the files in the working tree that are
* different between respective commit and HEAD, but keeps those which
* are different between the index and working tree
*/
MERGE, // TODO not implemented yet
/**
* Change the ref, the index and the workdir that are different between
* respective commit and HEAD
*/
KEEP // TODO not implemented yet
}
// We need to be able to distinguish whether the caller set the ref
// explicitly or not, so we apply the default (HEAD) only later.
private String ref = null;
private ResetType mode;
private Collection<String> filepaths = new LinkedList<String>();
/**
*
* @param repo
*/
public ResetCommand(Repository repo) {
super(repo);
}
/**
* Executes the {@code Reset} command. Each instance of this class should
* only be used for one invocation of the command. Don't call this method
* twice on an instance.
*
* @return the Ref after reset
* @throws GitAPIException
*/
public Ref call() throws GitAPIException, CheckoutConflictException {
checkCallable();
try {
RepositoryState state = repo.getRepositoryState();
final boolean merging = state.equals(RepositoryState.MERGING)
|| state.equals(RepositoryState.MERGING_RESOLVED);
final boolean cherryPicking = state
.equals(RepositoryState.CHERRY_PICKING)
|| state.equals(RepositoryState.CHERRY_PICKING_RESOLVED);
final boolean reverting = state.equals(RepositoryState.REVERTING)
|| state.equals(RepositoryState.REVERTING_RESOLVED);
final ObjectId commitId = resolveRefToCommitId();
// When ref is explicitly specified, it has to resolve
if (ref != null && commitId == null) {
// @TODO throw an InvalidRefNameException. We can't do that
// now because this would break the API
throw new JGitInternalException("Invalid ref " + ref
+ " specified");
}
final ObjectId commitTree;
if (commitId != null)
commitTree = parseCommit(commitId).getTree();
else
commitTree = null;
if (!filepaths.isEmpty()) {
// reset [commit] -- paths
resetIndexForPaths(commitTree);
setCallable(false);
return repo.getRef(Constants.HEAD);
}
final Ref result;
if (commitId != null) {
// write the ref
final RefUpdate ru = repo.updateRef(Constants.HEAD);
ru.setNewObjectId(commitId);
String refName = Repository.shortenRefName(getRefOrHEAD());
String message = refName + ": updating " + Constants.HEAD; //$NON-NLS-1$
ru.setRefLogMessage(message, false);
if (ru.forceUpdate() == RefUpdate.Result.LOCK_FAILURE)
throw new JGitInternalException(MessageFormat.format(
JGitText.get().cannotLock, ru.getName()));
ObjectId origHead = ru.getOldObjectId();
if (origHead != null)
repo.writeOrigHead(origHead);
result = ru.getRef();
} else {
result = repo.getRef(Constants.HEAD);
}
if (mode == null)
mode = ResetType.MIXED;
switch (mode) {
case HARD:
checkoutIndex(commitTree);
break;
case MIXED:
resetIndex(commitTree);
break;
case SOFT: // do nothing, only the ref was changed
break;
case KEEP: // TODO
case MERGE: // TODO
throw new UnsupportedOperationException();
}
if (mode != ResetType.SOFT) {
if (merging)
resetMerge();
else if (cherryPicking)
resetCherryPick();
else if (reverting)
resetRevert();
else if (repo.readSquashCommitMsg() != null)
repo.writeSquashCommitMsg(null /* delete */);
}
setCallable(false);
return result;
} catch (IOException e) {
throw new JGitInternalException(
JGitText.get().exceptionCaughtDuringExecutionOfResetCommand,
e);
}
}
private RevCommit parseCommit(final ObjectId commitId) {
RevCommit commit;
RevWalk rw = new RevWalk(repo);
try {
commit = rw.parseCommit(commitId);
} catch (IOException e) {
throw new JGitInternalException(MessageFormat.format(
JGitText.get().cannotReadCommit, commitId.toString()), e);
} finally {
rw.release();
}
return commit;
}
private ObjectId resolveRefToCommitId() {
try {
return repo.resolve(getRefOrHEAD() + "^{commit}"); //$NON-NLS-1$
} catch (IOException e) {
throw new JGitInternalException(
MessageFormat.format(JGitText.get().cannotRead, getRefOrHEAD()),
e);
}
}
/**
* @param ref
* the ref to reset to, defaults to HEAD if not specified
* @return this instance
*/
public ResetCommand setRef(String ref) {
this.ref = ref;
return this;
}
/**
* @param mode
* the mode of the reset command
* @return this instance
*/
public ResetCommand setMode(ResetType mode) {
if (!filepaths.isEmpty())
throw new JGitInternalException(MessageFormat.format(
JGitText.get().illegalCombinationOfArguments,
"[--mixed | --soft | --hard]", "<paths>...")); //$NON-NLS-1$
this.mode = mode;
return this;
}
/**
* @param path
* repository-relative path of file/directory to reset (with
* <code>/</code> as separator)
* @return this instance
*/
public ResetCommand addPath(String path) {
if (mode != null)
throw new JGitInternalException(MessageFormat.format(
JGitText.get().illegalCombinationOfArguments, "<paths>...",
"[--mixed | --soft | --hard]")); //$NON-NLS-1$
filepaths.add(path);
return this;
}
private String getRefOrHEAD() {
if (ref != null)
return ref;
else
return Constants.HEAD;
}
private void resetIndexForPaths(ObjectId commitTree) {
DirCache dc = null;
try {
dc = repo.lockDirCache();
DirCacheBuilder builder = dc.builder();
final TreeWalk tw = new TreeWalk(repo);
tw.addTree(new DirCacheBuildIterator(builder));
if (commitTree != null)
tw.addTree(commitTree);
else
tw.addTree(new EmptyTreeIterator());
tw.setFilter(PathFilterGroup.createFromStrings(filepaths));
tw.setRecursive(true);
while (tw.next()) {
final CanonicalTreeParser tree = tw.getTree(1,
CanonicalTreeParser.class);
// 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);
}
}
builder.commit();
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (dc != null)
dc.unlock();
}
}
private void resetIndex(ObjectId commitTree) throws IOException {
DirCache dc = repo.lockDirCache();
TreeWalk walk = null;
try {
DirCacheBuilder builder = dc.builder();
walk = new TreeWalk(repo);
if (commitTree != null)
walk.addTree(commitTree);
else
walk.addTree(new EmptyTreeIterator());
walk.addTree(new DirCacheIterator(dc));
walk.setRecursive(true);
while (walk.next()) {
AbstractTreeIterator cIter = walk.getTree(0,
AbstractTreeIterator.class);
if (cIter == null) {
// Not in commit, don't add to new index
continue;
}
final DirCacheEntry entry = new DirCacheEntry(walk.getRawPath());
entry.setFileMode(cIter.getEntryFileMode());
entry.setObjectIdFromRaw(cIter.idBuffer(), cIter.idOffset());
DirCacheIterator dcIter = walk.getTree(1,
DirCacheIterator.class);
if (dcIter != null && dcIter.idEqual(cIter)) {
DirCacheEntry indexEntry = dcIter.getDirCacheEntry();
entry.setLastModified(indexEntry.getLastModified());
entry.setLength(indexEntry.getLength());
}
builder.add(entry);
}
builder.commit();
} finally {
dc.unlock();
if (walk != null)
walk.release();
}
}
private void checkoutIndex(ObjectId commitTree) throws IOException,
GitAPIException {
DirCache dc = repo.lockDirCache();
try {
DirCacheCheckout checkout = new DirCacheCheckout(repo, dc,
commitTree);
checkout.setFailOnConflict(false);
try {
checkout.checkout();
} catch (org.eclipse.jgit.errors.CheckoutConflictException cce) {
throw new CheckoutConflictException(checkout.getConflicts(),
cce);
}
} finally {
dc.unlock();
}
}
private void resetMerge() throws IOException {
repo.writeMergeHeads(null);
repo.writeMergeCommitMsg(null);
}
private void resetCherryPick() throws IOException {
repo.writeCherryPickHead(null);
repo.writeMergeCommitMsg(null);
}
private void resetRevert() throws IOException {
repo.writeRevertHead(null);
repo.writeMergeCommitMsg(null);
}
}