Checkout: expose a CheckoutResult

This is needed by callers to determine checkout conflicts and
possible files that were not deleted during the checkout so that they
can present the end user with a better Exception description and retry
to delete the undeleted files later, respectively.

Change-Id: I037930da7b1a4dfb24cfa3205afb51dc29e4a5b8
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CheckoutCommandTest.java

@@ -42,8 +42,11 @@
  */
 package org.eclipse.jgit.api;
 
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 
+import org.eclipse.jgit.api.CheckoutResult.Status;
 import org.eclipse.jgit.api.errors.InvalidRefNameException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
 import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
@@ -52,6 +55,7 @@ import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.lib.RepositoryTestCase;
 import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.util.FileUtils;
 
 public class CheckoutCommandTest extends RepositoryTestCase {
 	private Git git;
@@ -120,4 +124,51 @@ public class CheckoutCommandTest extends RepositoryTestCase {
 		}
 	}
 
+	public void testCheckoutWithConflict() {
+		CheckoutCommand co = git.checkout();
+		try {
+			writeTrashFile("Test.txt", "Another change");
+			assertEquals(Status.NOT_TRIED, co.getResult().getStatus());
+			co.setName("master").call();
+			fail("Should have failed");
+		} catch (Exception e) {
+			assertEquals(Status.CONFLICTS, co.getResult().getStatus());
+			assertTrue(co.getResult().getConflictList().contains("Test.txt"));
+		}
+	}
+
+	public void testCheckoutWithNonDeletedFiles() throws Exception {
+		File testFile = writeTrashFile("temp", "");
+		FileInputStream fis = new FileInputStream(testFile);
+		try {
+			FileUtils.delete(testFile);
+			return;
+		} catch (IOException e) {
+			// the test makes only sense if deletion of
+			// a file with open stream fails
+		}
+		fis.close();
+		FileUtils.delete(testFile);
+		CheckoutCommand co = git.checkout();
+		// delete Test.txt in branch test
+		testFile = new File(db.getWorkTree(), "Test.txt");
+		assertTrue(testFile.exists());
+		FileUtils.delete(testFile);
+		assertFalse(testFile.exists());
+		git.add().addFilepattern("Test.txt");
+		git.commit().setMessage("Delete Test.txt").setAll(true).call();
+		git.checkout().setName("master").call();
+		assertTrue(testFile.exists());
+		// lock the file so it can't be deleted (in Windows, that is)
+		fis = new FileInputStream(testFile);
+		try {
+			assertEquals(Status.NOT_TRIED, co.getResult().getStatus());
+			co.setName("test").call();
+			assertTrue(testFile.exists());
+			assertEquals(Status.NONDELETED, co.getResult().getStatus());
+			assertTrue(co.getResult().getUndeletedList().contains("Test.txt"));
+		} finally {
+			fis.close();
+		}
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/api/CheckoutCommand.java

@@ -42,22 +42,27 @@
  */
 package org.eclipse.jgit.api;
 
+import java.io.File;
 import java.io.IOException;
 import java.text.MessageFormat;
+import java.util.ArrayList;
+import java.util.List;
 
 import org.eclipse.jgit.JGitText;
+import org.eclipse.jgit.api.CheckoutResult.Status;
 import org.eclipse.jgit.api.errors.InvalidRefNameException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
 import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
 import org.eclipse.jgit.api.errors.RefNotFoundException;
 import org.eclipse.jgit.dircache.DirCacheCheckout;
 import org.eclipse.jgit.errors.AmbiguousObjectException;
+import org.eclipse.jgit.errors.CheckoutConflictException;
 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.RefUpdate.Result;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.lib.RefUpdate.Result;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 
@@ -81,6 +86,8 @@ public class CheckoutCommand extends GitCommand<Ref> {
 
 	private RevCommit startCommit;
 
+	private CheckoutResult status;
+
 	/**
 	 * @param repo
 	 */
@@ -105,7 +112,7 @@ public class CheckoutCommand extends GitCommand<Ref> {
 		processOptions();
 		try {
 
-			if(createBranch) {
+			if (createBranch) {
 				Git git = new Git(repo);
 				CreateBranchCommand command = git.branchCreate();
 				command.setName(name);
@@ -123,20 +130,28 @@ public class CheckoutCommand extends GitCommand<Ref> {
 			ObjectId branch = repo.resolve(name);
 			Ref ref = repo.getRef(name);
 			if (branch == null)
-				throw new RefNotFoundException(MessageFormat.format(
-						JGitText.get().refNotResolved, name));
+				throw new RefNotFoundException(MessageFormat.format(JGitText
+						.get().refNotResolved, name));
 
 			RevCommit newCommit = revWalk.parseCommit(branch);
 
-			DirCacheCheckout dco = new DirCacheCheckout(repo,
-					headCommit.getTree(), repo.lockDirCache(),
-					newCommit.getTree());
+			DirCacheCheckout dco = new DirCacheCheckout(repo, headCommit
+					.getTree(), repo.lockDirCache(), newCommit.getTree());
 			dco.setFailOnConflict(true);
+			try {
 				dco.checkout();
+			} catch (CheckoutConflictException e) {
+				List<File> fileList = new ArrayList<File>();
+				for (String filePath : dco.getConflicts()) {
+					fileList.add(new File(repo.getWorkTree(), filePath));
+				}
+				status = new CheckoutResult(Status.CONFLICTS, fileList);
+				throw e;
+			}
 			RefUpdate refUpdate = repo.updateRef(Constants.HEAD);
 			refUpdate.setForceUpdate(force);
-			refUpdate.setRefLogMessage(
-					refLogMessage + "to " + newCommit.getName(), false);
+			refUpdate.setRefLogMessage(refLogMessage + "to "
+					+ newCommit.getName(), false);
 			Result updateResult = refUpdate.link(ref.getName());
 
 			setCallable(false);
@@ -156,16 +171,26 @@ public class CheckoutCommand extends GitCommand<Ref> {
 			}
 
 			if (!ok)
-				throw new JGitInternalException(MessageFormat.format(
-						JGitText.get().checkoutUnexpectedResult,
-						updateResult
-						.name()));
+				throw new JGitInternalException(MessageFormat.format(JGitText
+						.get().checkoutUnexpectedResult, updateResult.name()));
 
 			Ref result = repo.getRef(name);
 
+			if (!repo.isBare() && !dco.getToBeDeleted().isEmpty()) {
+				List<File> fileList = new ArrayList<File>();
+				for (String filePath : dco.getToBeDeleted()) {
+					fileList.add(new File(repo.getWorkTree(), filePath));
+				}
+				status = new CheckoutResult(Status.NONDELETED, fileList);
+			}
+			else
+				status = CheckoutResult.OK_RESULT;
 			return result;
 		} catch (IOException ioe) {
 			throw new JGitInternalException(ioe.getMessage(), ioe);
+		} finally {
+			if (status == null)
+				status = CheckoutResult.ERROR_RESULT;
 		}
 	}
 
@@ -269,4 +294,13 @@ public class CheckoutCommand extends GitCommand<Ref> {
 		this.upstreamMode = mode;
 		return this;
 	}
+
+	/**
+	 * @return the result
+	 */
+	public CheckoutResult getResult() {
+		if (status == null)
+			return CheckoutResult.NOT_TRIED_RESULT;
+		return status;
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/api/CheckoutResult.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@sap.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
+ * 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.api;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Encapsulates the result of a {@link CheckoutCommand}
+ *
+ */
+public class CheckoutResult {
+
+	/**
+	 * The {@link Status#OK} result;
+	 */
+	public static CheckoutResult OK_RESULT = new CheckoutResult(Status.OK, null);
+
+	/**
+	 * The {@link Status#ERROR} result;
+	 */
+	public static CheckoutResult ERROR_RESULT = new CheckoutResult(
+			Status.ERROR, null);
+
+	/**
+	 * The {@link Status#NOT_TRIED} result;
+	 */
+	public static CheckoutResult NOT_TRIED_RESULT = new CheckoutResult(
+			Status.NOT_TRIED, null);
+
+	/**
+	 * The status
+	 */
+	public enum Status {
+		/**
+		 * The call() method has not yet been executed
+		 */
+		NOT_TRIED,
+		/**
+		 * Checkout completed normally
+		 */
+		OK,
+		/**
+		 * Checkout has not completed because of checkout conflicts
+		 */
+		CONFLICTS,
+		/**
+		 * Checkout has completed, but some files could not be deleted
+		 */
+		NONDELETED,
+		/**
+		 * An Exception occurred during checkout
+		 */
+		ERROR;
+	}
+
+	private final Status myStatus;
+
+	private final List<File> conflictList;
+
+	private final List<File> undeletedList;
+
+	CheckoutResult(Status status, List<File> fileList) {
+		myStatus = status;
+		if (status == Status.CONFLICTS)
+			this.conflictList = fileList;
+		else
+			this.conflictList = new ArrayList<File>(0);
+		if (status == Status.NONDELETED)
+			this.undeletedList = fileList;
+		else
+			this.undeletedList = new ArrayList<File>(0);
+
+	}
+
+	/**
+	 * @return the status
+	 */
+	public Status getStatus() {
+		return myStatus;
+	}
+
+	/**
+	 * @return the list of files that created a checkout conflict, or an empty
+	 *         list if {@link #getStatus()} is not {@link Status#CONFLICTS};
+	 */
+	public List<File> getConflictList() {
+		return conflictList;
+	}
+
+	/**
+	 * @return the list of files that could not be deleted during checkout, or
+	 *         an empty list if {@link #getStatus()} is not
+	 *         {@link Status#NONDELETED};
+	 */
+	public List<File> getUndeletedList() {
+		return undeletedList;
+	}
+
+}