--- a/src/org/tmatesoft/hg/core/HgRevertCommand.java	Tue May 14 17:31:35 2013 +0200
+++ b/src/org/tmatesoft/hg/core/HgRevertCommand.java	Wed May 15 20:10:09 2013 +0200
@@ -21,13 +21,16 @@
 import java.util.LinkedHashSet;
 import java.util.Set;
 
+import org.tmatesoft.hg.internal.COWTransaction;
 import org.tmatesoft.hg.internal.CsetParamKeeper;
 import org.tmatesoft.hg.internal.DirstateBuilder;
 import org.tmatesoft.hg.internal.DirstateReader;
 import org.tmatesoft.hg.internal.Internals;
+import org.tmatesoft.hg.internal.Transaction;
 import org.tmatesoft.hg.repo.HgManifest;
 import org.tmatesoft.hg.repo.HgManifest.Flags;
 import org.tmatesoft.hg.repo.HgRepository;
+import org.tmatesoft.hg.repo.HgRepositoryLock;
 import org.tmatesoft.hg.repo.HgRuntimeException;
 import org.tmatesoft.hg.util.CancelSupport;
 import org.tmatesoft.hg.util.CancelledException;
@@ -99,6 +102,8 @@
 	 * @throws CancelledException if execution of the command was cancelled
 	 */
 	public void execute() throws HgException, CancelledException {
+		final HgRepositoryLock wdLock = repo.getWorkingDirLock();
+		wdLock.acquire();
 		try {
 			final ProgressSupport progress = getProgressSupport(null);
 			final CancelSupport cancellation = getCancelSupport(null, true);
@@ -155,11 +160,25 @@
 				progress.worked(1);
 				cancellation.checkCancelled();
 			}
-			dirstateBuilder.serialize();
+			Transaction.Factory trFactory = new COWTransaction.Factory();
+			Transaction tr = trFactory.create(repo);
+			try {
+				// TODO same code in HgAddRemoveCommand and similar in HgCommitCommand
+				dirstateBuilder.serialize(tr);
+				tr.commit();
+			} catch (RuntimeException ex) {
+				tr.rollback();
+				throw ex;
+			} catch (HgException ex) {
+				tr.rollback();
+				throw ex;
+			}
 			progress.worked(1);
 			progress.done();
 		} catch (HgRuntimeException ex) {
 			throw new HgLibraryFailureException(ex);
+		} finally {
+			wdLock.release();
 		}
 	}
 }