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package org.eclipse.orion.server.git.jobs;
import java.io.File;
import java.io.IOException;
import java.text.MessageFormat;
import org.eclipse.jgit.api.GitCommand;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.InvalidRefNameException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.NoHeadException;
import org.eclipse.jgit.api.errors.StashApplyFailureException;
import org.eclipse.jgit.api.errors.WrongRepositoryStateException;
import org.eclipse.jgit.dircache.DirCache;
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.errors.CheckoutConflictException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryState;
import org.eclipse.jgit.merge.MergeStrategy;
import org.eclipse.jgit.merge.ResolveMerger;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
/**
* Command class to apply a stashed commit.
*
* This class behaves like <em>git stash apply --index</em>, i.e. it tries to recover the stashed index state in addition to the working tree state.
*
* @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-stash.html" >Git documentation about Stash</a>
*
* @since 2.0
*/
public class StashApplyCommand extends GitCommand<ObjectId> {
private static final String DEFAULT_REF = Constants.STASH + "@{0}"; //$NON-NLS-1$
private String stashRef;
private boolean applyIndex = true;
private boolean applyUntracked = true;
private boolean ignoreRepositoryState;
private MergeStrategy strategy = MergeStrategy.RECURSIVE;
/**
* Create command to apply the changes of a stashed commit
*
* @param repo
*/
public StashApplyCommand(final Repository repo) {
super(repo);
}
/**
* Set the stash reference to apply
* <p>
* This will default to apply the latest stashed commit (stash@{0}) if unspecified
*
* @param stashRef
* @return {@code this}
*/
public StashApplyCommand setStashRef(final String stashRef) {
this.stashRef = stashRef;
return this;
}
/**
* @param ignoreRepositoryState
* @return {@code this}
* @since 3.2
*/
public StashApplyCommand ignoreRepositoryState(boolean ignoreRepositoryState) {
this.ignoreRepositoryState = ignoreRepositoryState;
return this;
}
private ObjectId getStashId() throws GitAPIException {
final String revision = stashRef != null ? stashRef : DEFAULT_REF;
final ObjectId stashId;
try {
stashId = repo.resolve(revision);
} catch (IOException e) {
throw new InvalidRefNameException(MessageFormat.format(JGitText.get().stashResolveFailed, revision), e);
}
if (stashId == null)
throw new InvalidRefNameException(MessageFormat.format(JGitText.get().stashResolveFailed, revision));
return stashId;
}
/**
* Apply the changes in a stashed commit to the working directory and index
*
* @return id of stashed commit that was applied TODO: Does anyone depend on this, or could we make it more like Merge/CherryPick/Revert?
* @throws GitAPIException
* @throws WrongRepositoryStateException
* @throws NoHeadException
* @throws StashApplyFailureException
*/
@Override
public ObjectId call() throws GitAPIException, WrongRepositoryStateException, NoHeadException, StashApplyFailureException {
checkCallable();
if (!ignoreRepositoryState && repo.getRepositoryState() != RepositoryState.SAFE)
throw new WrongRepositoryStateException(MessageFormat.format(JGitText.get().stashApplyOnUnsafeRepository, repo.getRepositoryState()));
ObjectReader reader = repo.newObjectReader();
try {
RevWalk revWalk = new RevWalk(reader);
ObjectId headCommit = repo.resolve(Constants.HEAD);
if (headCommit == null)
throw new NoHeadException(JGitText.get().stashApplyWithoutHead);
final ObjectId stashId = getStashId();
RevCommit stashCommit = revWalk.parseCommit(stashId);
if (stashCommit.getParentCount() < 2 || stashCommit.getParentCount() > 3)
throw new JGitInternalException(MessageFormat.format(JGitText.get().stashCommitIncorrectNumberOfParents, stashId.name(),
Integer.valueOf(stashCommit.getParentCount())));
ObjectId headTree = repo.resolve(Constants.HEAD + "^{tree}"); //$NON-NLS-1$
ObjectId stashIndexCommit = revWalk.parseCommit(stashCommit.getParent(1));
ObjectId stashHeadCommit = stashCommit.getParent(0);
ObjectId untrackedCommit = null;
if (applyUntracked && stashCommit.getParentCount() == 3)
untrackedCommit = revWalk.parseCommit(stashCommit.getParent(2));
ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
merger.setCommitNames(new String[] { "stashed HEAD", "HEAD", "stash" });
merger.setBase(stashHeadCommit);
merger.setWorkingTreeIterator(new FileTreeIterator(repo));
if (merger.merge(headCommit, stashCommit)) {
DirCache dc = repo.lockDirCache();
DirCacheCheckout dco = new DirCacheCheckout(repo, headTree, dc, merger.getResultTreeId());
dco.setFailOnConflict(true);
dco.checkout(); // Ignoring failed deletes....
if (applyIndex) {
ResolveMerger ixMerger = (ResolveMerger) strategy.newMerger(repo, true);
ixMerger.setCommitNames(new String[] { "stashed HEAD", "HEAD", "stashed index" });
ixMerger.setBase(stashHeadCommit);
boolean ok = ixMerger.merge(headCommit, stashIndexCommit);
if (ok) {
resetIndex(revWalk.parseTree(ixMerger.getResultTreeId()));
} else {
throw new StashApplyFailureException(JGitText.get().stashApplyConflict);
}
}
if (untrackedCommit != null) {
ResolveMerger untrackedMerger = (ResolveMerger) strategy.newMerger(repo, true);
untrackedMerger.setCommitNames(new String[] { "stashed HEAD", "HEAD", "untracked files" }); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$
untrackedMerger.setBase(stashHeadCommit);
boolean ok = untrackedMerger.merge(stashHeadCommit, untrackedCommit);
if (ok)
try {
RevTree untrackedTree = revWalk.parseTree(untrackedMerger.getResultTreeId());
resetUntracked(untrackedTree);
} catch (CheckoutConflictException e) {
throw new StashApplyFailureException(JGitText.get().stashApplyConflict);
}
else
throw new StashApplyFailureException(JGitText.get().stashApplyConflict);
}
} else {
throw new StashApplyFailureException(JGitText.get().stashApplyConflict);
}
return stashId;
} catch (JGitInternalException e) {
throw e;
} catch (IOException e) {
throw new JGitInternalException(JGitText.get().stashApplyFailed, e);
} finally {
reader.release();
}
}
/**
* @param applyIndex
* true (default) if the command should restore the index state
*/
public void setApplyIndex(boolean applyIndex) {
this.applyIndex = applyIndex;
}
/**
* @param strategy
* The merge strategy to use in order to merge during this command execution.
* @return {@code this}
* @since 3.4
*/
public StashApplyCommand setStrategy(MergeStrategy strategy) {
this.strategy = strategy;
return this;
}
/**
* @param applyUntracked
* true (default) if the command should restore untracked files
* @since 3.4
*/
public void setApplyUntracked(boolean applyUntracked) {
this.applyUntracked = applyUntracked;
}
private void resetIndex(RevTree tree) throws IOException {
DirCache dc = repo.lockDirCache();
TreeWalk walk = null;
try {
DirCacheBuilder builder = dc.builder();
walk = new TreeWalk(repo);
walk.addTree(tree);
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 resetUntracked(RevTree tree) throws CheckoutConflictException, IOException {
TreeWalk walk = null;
try {
walk = new TreeWalk(repo); // maybe NameConflictTreeWalk?
walk.addTree(tree);
walk.addTree(new FileTreeIterator(repo));
walk.setRecursive(true);
final ObjectReader reader = walk.getObjectReader();
while (walk.next()) {
final AbstractTreeIterator cIter = walk.getTree(0, AbstractTreeIterator.class);
if (cIter == null)
// Not in commit, don't create untracked
continue;
final DirCacheEntry entry = new DirCacheEntry(walk.getRawPath());
entry.setFileMode(cIter.getEntryFileMode());
entry.setObjectIdFromRaw(cIter.idBuffer(), cIter.idOffset());
FileTreeIterator fIter = walk.getTree(1, FileTreeIterator.class);
if (fIter != null) {
if (fIter.isModified(entry, true, reader)) {
// file exists and is dirty
throw new CheckoutConflictException(entry.getPathString());
}
}
checkoutPath(entry, reader);
}
} finally {
if (walk != null)
walk.release();
}
}
private void checkoutPath(DirCacheEntry entry, ObjectReader reader) {
try {
File file = new File(repo.getWorkTree(), entry.getPathString());
DirCacheCheckout.checkoutEntry(repo, file, entry, reader);
} catch (IOException e) {
throw new JGitInternalException(MessageFormat.format(JGitText.get().checkoutConflictWithFile, entry.getPathString()), e);
}
}
}