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

/*
 * Copyright (C) 2010, Christian Halstrick <christian.halstrick@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.
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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
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 * - Redistributions in binary form must reproduce the above
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package org.eclipse.jgit.api;

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

import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import org.eclipse.jgit.api.CherryPickResult.CherryPickStatus;
import org.eclipse.jgit.api.ResetCommand.ResetType;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.RepositoryState;
import org.eclipse.jgit.lib.RepositoryTestCase;
import org.eclipse.jgit.merge.ResolveMerger.MergeFailureReason;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.storage.file.ReflogReader;
import org.junit.Test;

/**
 * Test cherry-pick command
 */
public class CherryPickCommandTest extends RepositoryTestCase {
	@Test
	public void testCherryPick() throws IOException, JGitInternalException,
			GitAPIException {
		Git git = new Git(db);

		writeTrashFile("a", "first line\nsec. line\nthird line\n");
		git.add().addFilepattern("a").call();
		RevCommit firstCommit = git.commit().setMessage("create a").call();

		writeTrashFile("b", "content\n");
		git.add().addFilepattern("b").call();
		git.commit().setMessage("create b").call();

		writeTrashFile("a", "first line\nsec. line\nthird line\nfourth line\n");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("enlarged a").call();

		writeTrashFile("a",
				"first line\nsecond line\nthird line\nfourth line\n");
		git.add().addFilepattern("a").call();
		RevCommit fixingA = git.commit().setMessage("fixed a").call();

		git.branchCreate().setName("side").setStartPoint(firstCommit).call();
		checkoutBranch("refs/heads/side");

		writeTrashFile("a", "first line\nsec. line\nthird line\nfeature++\n");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("enhanced a").call();

		git.cherryPick().include(fixingA).call();

		assertFalse(new File(db.getWorkTree(), "b").exists());
		checkFile(new File(db.getWorkTree(), "a"),
				"first line\nsecond line\nthird line\nfeature++\n");
		Iterator<RevCommit> history = git.log().call().iterator();
		assertEquals("fixed a", history.next().getFullMessage());
		assertEquals("enhanced a", history.next().getFullMessage());
		assertEquals("create a", history.next().getFullMessage());
		assertFalse(history.hasNext());
	}

	@Test
	public void testCherryPickDirtyIndex() throws Exception {
		Git git = new Git(db);
		RevCommit sideCommit = prepareCherryPick(git);

		// modify and add file a
		writeTrashFile("a", "a(modified)");
		git.add().addFilepattern("a").call();
		// do not commit

		doCherryPickAndCheckResult(git, sideCommit,
				MergeFailureReason.DIRTY_INDEX);
	}

	@Test
	public void testCherryPickDirtyWorktree() throws Exception {
		Git git = new Git(db);
		RevCommit sideCommit = prepareCherryPick(git);

		// modify file a
		writeTrashFile("a", "a(modified)");
		// do not add and commit

		doCherryPickAndCheckResult(git, sideCommit,
				MergeFailureReason.DIRTY_WORKTREE);
	}

	@Test
	public void testCherryPickConflictResolution() throws Exception {
		Git git = new Git(db);
		RevCommit sideCommit = prepareCherryPick(git);

		CherryPickResult result = git.cherryPick().include(sideCommit.getId())
				.call();

		assertEquals(CherryPickStatus.CONFLICTING, result.getStatus());
		assertTrue(new File(db.getDirectory(), Constants.MERGE_MSG).exists());
		assertEquals("side\n\nConflicts:\n\ta\n", db.readMergeCommitMsg());
		assertTrue(new File(db.getDirectory(), Constants.CHERRY_PICK_HEAD)
				.exists());
		assertEquals(sideCommit.getId(), db.readCherryPickHead());
		assertEquals(RepositoryState.CHERRY_PICKING, db.getRepositoryState());

		// Resolve
		writeTrashFile("a", "a");
		git.add().addFilepattern("a").call();

		assertEquals(RepositoryState.CHERRY_PICKING_RESOLVED,
				db.getRepositoryState());

		git.commit().setOnly("a").setMessage("resolve").call();

		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
	}

	@Test
	public void testCherryPickConflictReset() throws Exception {
		Git git = new Git(db);

		RevCommit sideCommit = prepareCherryPick(git);

		CherryPickResult result = git.cherryPick().include(sideCommit.getId())
				.call();

		assertEquals(CherryPickStatus.CONFLICTING, result.getStatus());
		assertEquals(RepositoryState.CHERRY_PICKING, db.getRepositoryState());
		assertTrue(new File(db.getDirectory(), Constants.CHERRY_PICK_HEAD)
				.exists());

		git.reset().setMode(ResetType.MIXED).setRef("HEAD").call();

		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
		assertFalse(new File(db.getDirectory(), Constants.CHERRY_PICK_HEAD)
				.exists());
	}

	private RevCommit prepareCherryPick(final Git git) throws Exception {
		// create, add and commit file a
		writeTrashFile("a", "a");
		git.add().addFilepattern("a").call();
		RevCommit firstMasterCommit = git.commit().setMessage("first master")
				.call();

		// create and checkout side branch
		createBranch(firstMasterCommit, "refs/heads/side");
		checkoutBranch("refs/heads/side");
		// modify, add and commit file a
		writeTrashFile("a", "a(side)");
		git.add().addFilepattern("a").call();
		RevCommit sideCommit = git.commit().setMessage("side").call();

		// checkout master branch
		checkoutBranch("refs/heads/master");
		// modify, add and commit file a
		writeTrashFile("a", "a(master)");
		git.add().addFilepattern("a").call();
		git.commit().setMessage("second master").call();
		return sideCommit;
	}

	private void doCherryPickAndCheckResult(final Git git,
			final RevCommit sideCommit, final MergeFailureReason reason)
			throws Exception {
		// get current index state
		String indexState = indexState(CONTENT);

		// cherry-pick
		CherryPickResult result = git.cherryPick().include(sideCommit.getId())
				.call();
		assertEquals(CherryPickStatus.FAILED, result.getStatus());
		// staged file a causes DIRTY_INDEX
		assertEquals(1, result.getFailingPaths().size());
		assertEquals(reason, result.getFailingPaths().get("a"));
		assertEquals("a(modified)", read(new File(db.getWorkTree(), "a")));
		// index shall be unchanged
		assertEquals(indexState, indexState(CONTENT));
		assertEquals(RepositoryState.SAFE, db.getRepositoryState());

		if (reason == null) {
			ReflogReader reader = db.getReflogReader(Constants.HEAD);
			assertTrue(reader.getLastEntry().getComment()
					.startsWith("cherry-pick: "));
			reader = db.getReflogReader(db.getBranch());
			assertTrue(reader.getLastEntry().getComment()
					.startsWith("cherry-pick: "));
		}
	}
}