jgit/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/CheckoutTest.java

/*
 * Copyright (C) 2012, IBM Corporation
 * 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.
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 * without modification, are permitted provided that the following
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 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
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 *   with the distribution.
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 *   names of its contributors may be used to endorse or promote
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package org.eclipse.jgit.pgm;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.CheckoutConflictException;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.lib.CLIRepositoryTestCase;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.FileTreeIterator.FileEntry;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.util.FS;
import org.eclipse.jgit.util.FileUtils;
import org.junit.Assume;
import org.junit.Test;

public class CheckoutTest extends CLIRepositoryTestCase {

	@Test
	public void testCheckoutSelf() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertStringArrayEquals("Already on 'master'",
				execute("git checkout master"));
	}

	@Test
	public void testCheckoutBranch() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();
		new Git(db).branchCreate().setName("side").call();

		assertStringArrayEquals("Switched to branch 'side'",
				execute("git checkout side"));
	}

	@Test
	public void testCheckoutNewBranch() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertStringArrayEquals("Switched to a new branch 'side'",
				execute("git checkout -b side"));
	}

	@Test
	public void testCheckoutNonExistingBranch() throws Exception {
		assertStringArrayEquals(
				"error: pathspec 'side' did not match any file(s) known to git.",
				execute("git checkout side"));
	}

	@Test
	public void testCheckoutNewBranchThatAlreadyExists() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertStringArrayEquals(
				"fatal: A branch named 'master' already exists.",
				executeUnchecked("git checkout -b master"));
	}

	@Test
	public void testCheckoutNewBranchOnBranchToBeBorn() throws Exception {
		assertStringArrayEquals("fatal: You are on a branch yet to be born",
				executeUnchecked("git checkout -b side"));
	}

	@Test
	public void testCheckoutUnresolvedHead() throws Exception {
		assertStringArrayEquals(
				"error: pathspec 'HEAD' did not match any file(s) known to git.",
				execute("git checkout HEAD"));
	}

	@Test
	public void testCheckoutHead() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertStringArrayEquals("", execute("git checkout HEAD"));
	}

	@Test
	public void testCheckoutExistingBranchWithConflict() throws Exception {
		Git git = new Git(db);
		writeTrashFile("a", "Hello world a");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("commit file a").call();
		git.branchCreate().setName("branch_1").call();
		git.rm().addFilepattern("a").call();
		FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
		writeTrashFile("a/b", "Hello world b");
		git.add().addFilepattern("a/b").call();
		git.commit().setMessage("commit folder a").call();
		git.rm().addFilepattern("a").call();
		writeTrashFile("a", "New Hello world a");
		git.add().addFilepattern(".").call();

		String[] execute = execute("git checkout branch_1");
		assertEquals(
				"error: Your local changes to the following files would be overwritten by checkout:",
				execute[0]);
		assertEquals("\ta", execute[1]);
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add file 'a' and 'b'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>modify file 'a'
	 * <li>Commit
	 * <li>Delete file 'a' in the working tree
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The working tree should contain 'a' with FileMode.REGULAR_FILE after the
	 * checkout.
	 *
	 * @throws Exception
	 */
	@Test
	public void testCheckoutWithMissingWorkingTreeFile() throws Exception {
		Git git = new Git(db);
		File fileA = writeTrashFile("a", "Hello world a");
		writeTrashFile("b", "Hello world b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add files a & b").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		writeTrashFile("a", "b");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("modify file a").call();

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());

		FileUtils.delete(fileA);

		git.checkout().setName(branch_1.getName()).call();

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());
		assertEquals("Hello world a", read(fileA));
	}

	@Test
	public void testCheckoutOrphan() throws Exception {
		Git git = new Git(db);
		git.commit().setMessage("initial commit").call();

		assertStringArrayEquals("Switched to a new branch 'new_branch'",
				execute("git checkout --orphan new_branch"));
		assertEquals("refs/heads/new_branch",
				db.exactRef("HEAD").getTarget().getName());
		RevCommit commit = git.commit().setMessage("orphan commit").call();
		assertEquals(0, commit.getParentCount());
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add file 'b'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Add folder 'a'
	 * <li>Commit
	 * <li>Replace folder 'a' by file 'a' in the working tree
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The working tree should contain 'a' with FileMode.REGULAR_FILE after the
	 * checkout.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestMissingThenFolderWithFileInWorkingTree()
			throws Exception {
		Git git = new Git(db);
		writeTrashFile("b", "Hello world b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add file b").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		File folderA = new File(db.getWorkTree(), "a");
		FileUtils.mkdirs(folderA);
		writeTrashFile("a/c", "Hello world c");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add folder a").call();

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.TREE, entry.getMode());

		FileUtils.delete(folderA, FileUtils.RECURSIVE);
		writeTrashFile("a", "b");

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());

		git.checkout().setName(branch_1.getName()).call();

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add file 'a'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Replace file 'a' by folder 'a'
	 * <li>Commit
	 * <li>Delete folder 'a' in the working tree
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The working tree should contain 'a' with FileMode.REGULAR_FILE after the
	 * checkout.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestFolderWithMissingInWorkingTree() throws Exception {
		Git git = new Git(db);
		writeTrashFile("b", "Hello world b");
		writeTrashFile("a", "b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add file b & file a").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		git.rm().addFilepattern("a").call();
		File folderA = new File(db.getWorkTree(), "a");
		FileUtils.mkdirs(folderA);
		writeTrashFile("a/c", "Hello world c");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add folder a").call();

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.TREE, entry.getMode());

		FileUtils.delete(folderA, FileUtils.RECURSIVE);

		git.checkout().setName(branch_1.getName()).call();

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add file 'a'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Delete file 'a'
	 * <li>Commit
	 * <li>Add folder 'a' in the working tree
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The checkout command should raise an error. The conflicting paths are 'a'
	 * and 'a/c'.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestMissingWithFolderInWorkingTree() throws Exception {
		Git git = new Git(db);
		writeTrashFile("b", "Hello world b");
		writeTrashFile("a", "b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add file b & file a").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		git.rm().addFilepattern("a").call();
		git.commit().setMessage("delete file a").call();

		FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
		writeTrashFile("a/c", "Hello world c");

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.TREE, entry.getMode());

		CheckoutConflictException exception = null;
		try {
			git.checkout().setName(branch_1.getName()).call();
		} catch (CheckoutConflictException e) {
			exception = e;
		}
		assertNotNull(exception);
		assertEquals(2, exception.getConflictingPaths().size());
		assertEquals("a", exception.getConflictingPaths().get(0));
		assertEquals("a/c", exception.getConflictingPaths().get(1));
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add folder 'a'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Delete folder 'a'
	 * <li>Commit
	 * <li>Add file 'a' in the working tree
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The checkout command should raise an error. The conflicting path is 'a'.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestFolderThenMissingWithFileInWorkingTree()
			throws Exception {
		Git git = new Git(db);
		FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
		writeTrashFile("a/c", "Hello world c");
		writeTrashFile("b", "Hello world b");
		git.add().addFilepattern(".").call();
		RevCommit commit1 = git.commit().setMessage("add folder a & file b")
				.call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		git.rm().addFilepattern("a").call();
		RevCommit commit2 = git.commit().setMessage("delete folder a").call();

		TreeWalk tw = new TreeWalk(db);
		tw.addTree(commit1.getTree());
		tw.addTree(commit2.getTree());
		List<DiffEntry> scan = DiffEntry.scan(tw);
		assertEquals(1, scan.size());
		assertEquals(FileMode.MISSING, scan.get(0).getNewMode());
		assertEquals(FileMode.TREE, scan.get(0).getOldMode());

		writeTrashFile("a", "b");

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());

		CheckoutConflictException exception = null;
		try {
			git.checkout().setName(branch_1.getName()).call();
		} catch (CheckoutConflictException e) {
			exception = e;
		}
		assertNotNull(exception);
		assertEquals(1, exception.getConflictingPaths().size());
		assertEquals("a", exception.getConflictingPaths().get(0));
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add folder 'a'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Replace folder 'a'by file 'a'
	 * <li>Commit
	 * <li>Delete file 'a' in the working tree
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The working tree should contain 'a' with FileMode.TREE after the
	 * checkout.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestFolderThenFileWithMissingInWorkingTree()
			throws Exception {
		Git git = new Git(db);
		FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
		writeTrashFile("a/c", "Hello world c");
		writeTrashFile("b", "Hello world b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add folder a & file b").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		git.rm().addFilepattern("a").call();
		File fileA = new File(db.getWorkTree(), "a");
		writeTrashFile("a", "b");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("add file a").call();

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());

		FileUtils.delete(fileA);

		git.checkout().setName(branch_1.getName()).call();

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.TREE, entry.getMode());
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add file 'a'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Modify file 'a'
	 * <li>Commit
	 * <li>Delete file 'a' & replace by folder 'a' in the working tree & index
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The checkout command should raise an error. The conflicting path is 'a'.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestFileThenFileWithFolderInIndex() throws Exception {
		Git git = new Git(db);
		writeTrashFile("a", "Hello world a");
		writeTrashFile("b", "Hello world b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add files a & b").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		writeTrashFile("a", "b");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("add file a").call();

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());

		git.rm().addFilepattern("a").call();
		FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
		writeTrashFile("a/c", "Hello world c");
		git.add().addFilepattern(".").call();

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.TREE, entry.getMode());

		CheckoutConflictException exception = null;
		try {
			git.checkout().setName(branch_1.getName()).call();
		} catch (CheckoutConflictException e) {
			exception = e;
		}
		assertNotNull(exception);
		assertEquals(1, exception.getConflictingPaths().size());
		assertEquals("a", exception.getConflictingPaths().get(0));
	}

	/**
	 * Steps:
	 * <ol>
	 * <li>Add file 'a'
	 * <li>Commit
	 * <li>Create branch '1'
	 * <li>Modify file 'a'
	 * <li>Commit
	 * <li>Delete file 'a' & replace by folder 'a' in the working tree & index
	 * <li>Checkout branch '1'
	 * </ol>
	 * <p>
	 * The checkout command should raise an error. The conflicting paths are 'a'
	 * and 'a/c'.
	 *
	 * @throws Exception
	 */
	@Test
	public void fileModeTestFileWithFolderInIndex() throws Exception {
		Git git = new Git(db);
		writeTrashFile("b", "Hello world b");
		writeTrashFile("a", "b");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("add file b & file a").call();
		Ref branch_1 = git.branchCreate().setName("branch_1").call();
		git.rm().addFilepattern("a").call();
		writeTrashFile("a", "Hello world a");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("add file a").call();

		FileEntry entry = new FileTreeIterator.FileEntry(new File(
				db.getWorkTree(), "a"), db.getFS());
		assertEquals(FileMode.REGULAR_FILE, entry.getMode());

		git.rm().addFilepattern("a").call();
		FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
		writeTrashFile("a/c", "Hello world c");
		git.add().addFilepattern(".").call();

		entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
				db.getFS());
		assertEquals(FileMode.TREE, entry.getMode());

		CheckoutConflictException exception = null;
		try {
			git.checkout().setName(branch_1.getName()).call();
		} catch (CheckoutConflictException e) {
			exception = e;
		}
		assertNotNull(exception);
		assertEquals(1, exception.getConflictingPaths().size());
		assertEquals("a", exception.getConflictingPaths().get(0));

		// TODO: ideally we'd like to get two paths from this exception
		// assertEquals(2, exception.getConflictingPaths().size());
		// assertEquals("a", exception.getConflictingPaths().get(0));
		// assertEquals("a/c", exception.getConflictingPaths().get(1));
	}

	@Test
	public void testCheckoutPath() throws Exception {
		Git git = new Git(db);
		writeTrashFile("a", "Hello world a");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("commit file a").call();
		git.branchCreate().setName("branch_1").call();
		git.checkout().setName("branch_1").call();
		File b = writeTrashFile("b", "Hello world b");
		git.add().addFilepattern("b").call();
		git.commit().setMessage("commit file b").call();
		File a = writeTrashFile("a", "New Hello world a");
		git.add().addFilepattern(".").call();
		git.commit().setMessage("modified a").call();
		assertArrayEquals(new String[] { "" },
				execute("git checkout HEAD~2 -- a"));
		assertEquals("Hello world a", read(a));
		assertArrayEquals(new String[] { "* branch_1", "  master", "" },
				execute("git branch"));
		assertEquals("Hello world b", read(b));
	}

	@Test
	public void testCheckouSingleFile() throws Exception {
		try (Git git = new Git(db)) {
			File a = writeTrashFile("a", "file a");
			git.add().addFilepattern(".").call();
			git.commit().setMessage("commit file a").call();
			writeTrashFile("a", "b");
			assertEquals("b", read(a));
			assertEquals("[]", Arrays.toString(execute("git checkout -- a")));
			assertEquals("file a", read(a));
		}
	}

	@Test
	public void testCheckoutLink() throws Exception {
		Assume.assumeTrue(FS.DETECTED.supportsSymlinks());
		try (Git git = new Git(db)) {
			Path path = writeLink("a", "link_a");
			assertTrue(Files.isSymbolicLink(path));
			git.add().addFilepattern(".").call();
			git.commit().setMessage("commit link a").call();
			deleteTrashFile("a");
			writeTrashFile("a", "Hello world a");
			assertFalse(Files.isSymbolicLink(path));
			assertEquals("[]", Arrays.toString(execute("git checkout -- a")));
			assertEquals("link_a", FileUtils.readSymLink(path.toFile()));
			assertTrue(Files.isSymbolicLink(path));
		}
	}
}