Package org.eclipse.jgit.storage.file

Source Code of org.eclipse.jgit.storage.file.T0003_Basic

/*
* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
* Copyright (C) 2007-2010, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
* 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.storage.file;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.Commit;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileTreeEntry;
import org.eclipse.jgit.lib.ObjectDatabase;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectWriter;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.SampleDataRepositoryTestCase;
import org.eclipse.jgit.lib.Tag;
import org.eclipse.jgit.lib.Tree;
import org.eclipse.jgit.lib.TreeEntry;
import org.eclipse.jgit.lib.WriteTree;

public class T0003_Basic extends SampleDataRepositoryTestCase {
  public void test001_Initalize() {
    final File gitdir = new File(trash, Constants.DOT_GIT);
    final File objects = new File(gitdir, "objects");
    final File objects_pack = new File(objects, "pack");
    final File objects_info = new File(objects, "info");
    final File refs = new File(gitdir, "refs");
    final File refs_heads = new File(refs, "heads");
    final File refs_tags = new File(refs, "tags");
    final File HEAD = new File(gitdir, "HEAD");

    assertTrue("Exists " + trash, trash.isDirectory());
    assertTrue("Exists " + objects, objects.isDirectory());
    assertTrue("Exists " + objects_pack, objects_pack.isDirectory());
    assertTrue("Exists " + objects_info, objects_info.isDirectory());
    assertEquals(2, objects.listFiles().length);
    assertTrue("Exists " + refs, refs.isDirectory());
    assertTrue("Exists " + refs_heads, refs_heads.isDirectory());
    assertTrue("Exists " + refs_tags, refs_tags.isDirectory());
    assertTrue("Exists " + HEAD, HEAD.isFile());
    assertEquals(23, HEAD.length());
  }

  public void test000_openRepoBadArgs() throws IOException {
    try {
      new FileRepositoryBuilder().build();
      fail("Must pass either GIT_DIR or GIT_WORK_TREE");
    } catch (IllegalArgumentException e) {
      assertEquals(
          JGitText.get().eitherGitDirOrWorkTreeRequired,
          e.getMessage());
    }
  }

  /**
   * Check the default rules for looking up directories and files within a
   * repo when the gitDir is given.
   *
   * @throws IOException
   */
  public void test000_openrepo_default_gitDirSet() throws IOException {
    File repo1Parent = new File(trash.getParentFile(), "r1");
    Repository repo1initial = new FileRepository(new File(repo1Parent, Constants.DOT_GIT));
    repo1initial.create();
    repo1initial.close();

    File theDir = new File(repo1Parent, Constants.DOT_GIT);
    FileRepository r = new FileRepositoryBuilder().setGitDir(theDir).build();
    assertEqualsPath(theDir, r.getDirectory());
    assertEqualsPath(repo1Parent, r.getWorkTree());
    assertEqualsPath(new File(theDir, "index"), r.getIndexFile());
    assertEqualsPath(new File(theDir, "objects"), r.getObjectDatabase().getDirectory());
  }

  /**
   * Check that we can pass both a git directory and a work tree
   * repo when the gitDir is given.
   *
   * @throws IOException
   */
  public void test000_openrepo_default_gitDirAndWorkTreeSet() throws IOException {
    File repo1Parent = new File(trash.getParentFile(), "r1");
    Repository repo1initial = new FileRepository(new File(repo1Parent, Constants.DOT_GIT));
    repo1initial.create();
    repo1initial.close();

    File theDir = new File(repo1Parent, Constants.DOT_GIT);
    FileRepository r = new FileRepositoryBuilder().setGitDir(theDir)
        .setWorkTree(repo1Parent.getParentFile()).build();
    assertEqualsPath(theDir, r.getDirectory());
    assertEqualsPath(repo1Parent.getParentFile(), r.getWorkTree());
    assertEqualsPath(new File(theDir, "index"), r.getIndexFile());
    assertEqualsPath(new File(theDir, "objects"), r.getObjectDatabase().getDirectory());
  }

  /**
   * Check the default rules for looking up directories and files within a
   * repo when the workTree is given.
   *
   * @throws IOException
   */
  public void test000_openrepo_default_workDirSet() throws IOException {
    File repo1Parent = new File(trash.getParentFile(), "r1");
    Repository repo1initial = new FileRepository(new File(repo1Parent, Constants.DOT_GIT));
    repo1initial.create();
    repo1initial.close();

    File theDir = new File(repo1Parent, Constants.DOT_GIT);
    FileRepository r = new FileRepositoryBuilder().setWorkTree(repo1Parent).build();
    assertEqualsPath(theDir, r.getDirectory());
    assertEqualsPath(repo1Parent, r.getWorkTree());
    assertEqualsPath(new File(theDir, "index"), r.getIndexFile());
    assertEqualsPath(new File(theDir, "objects"), r.getObjectDatabase().getDirectory());
  }

  /**
   * Check that worktree config has an effect, given absolute path.
   *
   * @throws IOException
   */
  public void test000_openrepo_default_absolute_workdirconfig()
      throws IOException {
    File repo1Parent = new File(trash.getParentFile(), "r1");
    File workdir = new File(trash.getParentFile(), "rw");
    workdir.mkdir();
    FileRepository repo1initial = new FileRepository(new File(repo1Parent, Constants.DOT_GIT));
    repo1initial.create();
    repo1initial.getConfig().setString("core", null, "worktree",
        workdir.getAbsolutePath());
    repo1initial.getConfig().save();
    repo1initial.close();

    File theDir = new File(repo1Parent, Constants.DOT_GIT);
    FileRepository r = new FileRepositoryBuilder().setGitDir(theDir).build();
    assertEqualsPath(theDir, r.getDirectory());
    assertEqualsPath(workdir, r.getWorkTree());
    assertEqualsPath(new File(theDir, "index"), r.getIndexFile());
    assertEqualsPath(new File(theDir, "objects"), r.getObjectDatabase().getDirectory());
  }

  /**
   * Check that worktree config has an effect, given a relative path.
   *
   * @throws IOException
   */
  public void test000_openrepo_default_relative_workdirconfig()
      throws IOException {
    File repo1Parent = new File(trash.getParentFile(), "r1");
    File workdir = new File(trash.getParentFile(), "rw");
    workdir.mkdir();
    FileRepository repo1initial = new FileRepository(new File(repo1Parent, Constants.DOT_GIT));
    repo1initial.create();
    repo1initial.getConfig()
        .setString("core", null, "worktree", "../../rw");
    repo1initial.getConfig().save();
    repo1initial.close();

    File theDir = new File(repo1Parent, Constants.DOT_GIT);
    FileRepository r = new FileRepositoryBuilder().setGitDir(theDir).build();
    assertEqualsPath(theDir, r.getDirectory());
    assertEqualsPath(workdir, r.getWorkTree());
    assertEqualsPath(new File(theDir, "index"), r.getIndexFile());
    assertEqualsPath(new File(theDir, "objects"), r.getObjectDatabase().getDirectory());
  }

  /**
   * Check that the given index file is honored and the alternate object
   * directories too
   *
   * @throws IOException
   */
  public void test000_openrepo_alternate_index_file_and_objdirs()
      throws IOException {
    File repo1Parent = new File(trash.getParentFile(), "r1");
    File indexFile = new File(trash, "idx");
    File objDir = new File(trash, "../obj");
    File altObjDir = db.getObjectDatabase().getDirectory();
    Repository repo1initial = new FileRepository(new File(repo1Parent, Constants.DOT_GIT));
    repo1initial.create();
    repo1initial.close();

    File theDir = new File(repo1Parent, Constants.DOT_GIT);
    FileRepository r = new FileRepositoryBuilder() //
        .setGitDir(theDir).setObjectDirectory(objDir) //
        .addAlternateObjectDirectory(altObjDir) //
        .setIndexFile(indexFile) //
        .build();
    assertEqualsPath(theDir, r.getDirectory());
    assertEqualsPath(theDir.getParentFile(), r.getWorkTree());
    assertEqualsPath(indexFile, r.getIndexFile());
    assertEqualsPath(objDir, r.getObjectDatabase().getDirectory());
    assertNotNull(r.mapCommit("6db9c2ebf75590eef973081736730a9ea169a0c4"));
    // Must close or the default repo pack files created by this test gets
    // locked via the alternate object directories on Windows.
    r.close();
  }

  protected void assertEqualsPath(File expected, File actual)
      throws IOException {
    assertEquals(expected.getCanonicalPath(), actual.getCanonicalPath());
  }

  public void test002_WriteEmptyTree() throws IOException {
    // One of our test packs contains the empty tree object. If the pack is
    // open when we create it we won't write the object file out as a loose
    // object (as it already exists in the pack).
    //
    final Repository newdb = createBareRepository();
    final Tree t = new Tree(newdb);
    t.accept(new WriteTree(trash, newdb), TreeEntry.MODIFIED_ONLY);
    assertEquals("4b825dc642cb6eb9a060e54bf8d69288fbee4904", t.getId()
        .name());
    final File o = new File(new File(new File(newdb.getDirectory(),
        "objects"), "4b"), "825dc642cb6eb9a060e54bf8d69288fbee4904");
    assertTrue("Exists " + o, o.isFile());
    assertTrue("Read-only " + o, !o.canWrite());
  }

  public void test002_WriteEmptyTree2() throws IOException {
    // File shouldn't exist as it is in a test pack.
    //
    final Tree t = new Tree(db);
    t.accept(new WriteTree(trash, db), TreeEntry.MODIFIED_ONLY);
    assertEquals("4b825dc642cb6eb9a060e54bf8d69288fbee4904", t.getId()
        .name());
    final File o = new File(new File(
        new File(db.getDirectory(), "objects"), "4b"),
        "825dc642cb6eb9a060e54bf8d69288fbee4904");
    assertFalse("Exists " + o, o.isFile());
  }

  public void test003_WriteShouldBeEmptyTree() throws IOException {
    final Tree t = new Tree(db);
    final ObjectId emptyId = new ObjectWriter(db).writeBlob(new byte[0]);
    t.addFile("should-be-empty").setId(emptyId);
    t.accept(new WriteTree(trash, db), TreeEntry.MODIFIED_ONLY);
    assertEquals("7bb943559a305bdd6bdee2cef6e5df2413c3d30a", t.getId()
        .name());

    File o;
    o = new File(new File(new File(db.getDirectory(), "objects"), "7b"),
        "b943559a305bdd6bdee2cef6e5df2413c3d30a");
    assertTrue("Exists " + o, o.isFile());
    assertTrue("Read-only " + o, !o.canWrite());

    o = new File(new File(new File(db.getDirectory(), "objects"), "e6"),
        "9de29bb2d1d6434b8b29ae775ad8c2e48c5391");
    assertTrue("Exists " + o, o.isFile());
    assertTrue("Read-only " + o, !o.canWrite());
  }

  public void test005_ReadSimpleConfig() {
    final Config c = db.getConfig();
    assertNotNull(c);
    assertEquals("0", c.getString("core", null, "repositoryformatversion"));
    assertEquals("0", c.getString("CoRe", null, "REPOSITORYFoRmAtVeRsIoN"));
    assertEquals("true", c.getString("core", null, "filemode"));
    assertEquals("true", c.getString("cOrE", null, "fIlEModE"));
    assertNull(c.getString("notavalue", null, "reallyNotAValue"));
  }

  public void test006_ReadUglyConfig() throws IOException,
      ConfigInvalidException {
    final File cfg = new File(db.getDirectory(), "config");
    final FileBasedConfig c = new FileBasedConfig(cfg, db.getFS());
    final FileWriter pw = new FileWriter(cfg);
    final String configStr = "  [core];comment\n\tfilemode = yes\n"
        + "[user]\n"
        + "  email = A U Thor <thor@example.com> # Just an example...\n"
        + " name = \"A  Thor \\\\ \\\"\\t \"\n"
        + "    defaultCheckInComment = a many line\\n\\\ncomment\\n\\\n"
        + " to test\n";
    pw.write(configStr);
    pw.close();
    c.load();
    assertEquals("yes", c.getString("core", null, "filemode"));
    assertEquals("A U Thor <thor@example.com>", c
        .getString("user", null, "email"));
    assertEquals("A  Thor \\ \"\t ", c.getString("user", null, "name"));
    assertEquals("a many line\ncomment\n to test", c.getString("user",
        null, "defaultCheckInComment"));
    c.save();
    final FileReader fr = new FileReader(cfg);
    final char[] cbuf = new char[configStr.length()];
    fr.read(cbuf);
    fr.close();
    assertEquals(configStr, new String(cbuf));
  }

  public void test007_Open() throws IOException {
    final FileRepository db2 = new FileRepository(db.getDirectory());
    assertEquals(db.getDirectory(), db2.getDirectory());
    assertEquals(db.getObjectDatabase().getDirectory(), db2.getObjectDatabase().getDirectory());
    assertNotSame(db.getConfig(), db2.getConfig());
  }

  public void test008_FailOnWrongVersion() throws IOException {
    final File cfg = new File(db.getDirectory(), "config");
    final FileWriter pw = new FileWriter(cfg);
    final String badvers = "ihopethisisneveraversion";
    final String configStr = "[core]\n" + "\trepositoryFormatVersion="
        + badvers + "\n";
    pw.write(configStr);
    pw.close();

    try {
      new FileRepository(db.getDirectory());
      fail("incorrectly opened a bad repository");
    } catch (IOException ioe) {
      assertTrue(ioe.getMessage().indexOf("format") > 0);
      assertTrue(ioe.getMessage().indexOf(badvers) > 0);
    }
  }

  public void test009_CreateCommitOldFormat() throws IOException {
    final Tree t = new Tree(db);
    final FileTreeEntry f = t.addFile("i-am-a-file");
    writeTrashFile(f.getName(), "and this is the data in me\n");
    t.accept(new WriteTree(trash, db), TreeEntry.MODIFIED_ONLY);
    assertEquals(ObjectId.fromString("00b1f73724f493096d1ffa0b0f1f1482dbb8c936"),
        t.getTreeId());

    final Commit c = new Commit(db);
    c.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    c.setCommitter(new PersonIdent(committer, 1154236443000L, -4 * 60));
    c.setMessage("A Commit\n");
    c.setTree(t);
    assertEquals(t.getTreeId(), c.getTreeId());
    c.commit();
    final ObjectId cmtid = ObjectId.fromString(
        "803aec4aba175e8ab1d666873c984c0308179099");
    assertEquals(cmtid, c.getCommitId());

    // Verify the commit we just wrote is in the correct format.
    ObjectDatabase odb = db.getObjectDatabase();
    assertTrue("is ObjectDirectory", odb instanceof ObjectDirectory);
    final XInputStream xis = new XInputStream(new FileInputStream(
        ((ObjectDirectory) odb).fileFor(cmtid)));
    try {
      assertEquals(0x78, xis.readUInt8());
      assertEquals(0x9c, xis.readUInt8());
      assertTrue(0x789c % 31 == 0);
    } finally {
      xis.close();
    }

    // Verify we can read it.
    final Commit c2 = db.mapCommit(cmtid);
    assertNotNull(c2);
    assertEquals(c.getMessage(), c2.getMessage());
    assertEquals(c.getTreeId(), c2.getTreeId());
    assertEquals(c.getAuthor(), c2.getAuthor());
    assertEquals(c.getCommitter(), c2.getCommitter());
  }

  public void test012_SubtreeExternalSorting() throws IOException {
    final ObjectId emptyBlob = new ObjectWriter(db).writeBlob(new byte[0]);
    final Tree t = new Tree(db);
    final FileTreeEntry e0 = t.addFile("a-");
    final FileTreeEntry e1 = t.addFile("a-b");
    final FileTreeEntry e2 = t.addFile("a/b");
    final FileTreeEntry e3 = t.addFile("a=");
    final FileTreeEntry e4 = t.addFile("a=b");

    e0.setId(emptyBlob);
    e1.setId(emptyBlob);
    e2.setId(emptyBlob);
    e3.setId(emptyBlob);
    e4.setId(emptyBlob);

    t.accept(new WriteTree(trash, db), TreeEntry.MODIFIED_ONLY);
    assertEquals(ObjectId.fromString("b47a8f0a4190f7572e11212769090523e23eb1ea"),
        t.getId());
  }

  public void test020_createBlobTag() throws IOException {
    final ObjectId emptyId = new ObjectWriter(db).writeBlob(new byte[0]);
    final Tag t = new Tag(db);
    t.setObjId(emptyId);
    t.setType("blob");
    t.setTag("test020");
    t.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    t.setMessage("test020 tagged\n");
    t.tag();
    assertEquals("6759556b09fbb4fd8ae5e315134481cc25d46954", t.getTagId().name());

    Tag mapTag = db.mapTag("test020");
    assertEquals("blob", mapTag.getType());
    assertEquals("test020 tagged\n", mapTag.getMessage());
    assertEquals(new PersonIdent(author, 1154236443000L, -4 * 60), mapTag.getAuthor());
    assertEquals("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391", mapTag.getObjId().name());
  }

  public void test020b_createBlobPlainTag() throws IOException {
    test020_createBlobTag();
    Tag t = new Tag(db);
    t.setTag("test020b");
    t.setObjId(ObjectId.fromString("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"));
    t.tag();

    Tag mapTag = db.mapTag("test020b");
    assertEquals("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391", mapTag.getObjId().name());

    // We do not repeat the plain tag test for other object types
  }

  public void test021_createTreeTag() throws IOException {
    final ObjectId emptyId = new ObjectWriter(db).writeBlob(new byte[0]);
    final Tree almostEmptyTree = new Tree(db);
    almostEmptyTree.addEntry(new FileTreeEntry(almostEmptyTree, emptyId, "empty".getBytes(), false));
    final ObjectId almostEmptyTreeId = new ObjectWriter(db).writeTree(almostEmptyTree);
    final Tag t = new Tag(db);
    t.setObjId(almostEmptyTreeId);
    t.setType("tree");
    t.setTag("test021");
    t.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    t.setMessage("test021 tagged\n");
    t.tag();
    assertEquals("b0517bc8dbe2096b419d42424cd7030733f4abe5", t.getTagId().name());

    Tag mapTag = db.mapTag("test021");
    assertEquals("tree", mapTag.getType());
    assertEquals("test021 tagged\n", mapTag.getMessage());
    assertEquals(new PersonIdent(author, 1154236443000L, -4 * 60), mapTag.getAuthor());
    assertEquals("417c01c8795a35b8e835113a85a5c0c1c77f67fb", mapTag.getObjId().name());
  }

  public void test022_createCommitTag() throws IOException {
    final ObjectId emptyId = new ObjectWriter(db).writeBlob(new byte[0]);
    final Tree almostEmptyTree = new Tree(db);
    almostEmptyTree.addEntry(new FileTreeEntry(almostEmptyTree, emptyId, "empty".getBytes(), false));
    final ObjectId almostEmptyTreeId = new ObjectWriter(db).writeTree(almostEmptyTree);
    final Commit almostEmptyCommit = new Commit(db);
    almostEmptyCommit.setAuthor(new PersonIdent(author, 1154236443000L, -2 * 60)); // not exactly the same
    almostEmptyCommit.setCommitter(new PersonIdent(author, 1154236443000L, -2 * 60));
    almostEmptyCommit.setMessage("test022\n");
    almostEmptyCommit.setTreeId(almostEmptyTreeId);
    ObjectId almostEmptyCommitId = new ObjectWriter(db).writeCommit(almostEmptyCommit);
    final Tag t = new Tag(db);
    t.setObjId(almostEmptyCommitId);
    t.setType("commit");
    t.setTag("test022");
    t.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    t.setMessage("test022 tagged\n");
    t.tag();
    assertEquals("0ce2ebdb36076ef0b38adbe077a07d43b43e3807", t.getTagId().name());

    Tag mapTag = db.mapTag("test022");
    assertEquals("commit", mapTag.getType());
    assertEquals("test022 tagged\n", mapTag.getMessage());
    assertEquals(new PersonIdent(author, 1154236443000L, -4 * 60), mapTag.getAuthor());
    assertEquals("b5d3b45a96b340441f5abb9080411705c51cc86c", mapTag.getObjId().name());
  }

  public void test023_createCommitNonAnullii() throws IOException {
    final ObjectId emptyId = new ObjectWriter(db).writeBlob(new byte[0]);
    final Tree almostEmptyTree = new Tree(db);
    almostEmptyTree.addEntry(new FileTreeEntry(almostEmptyTree, emptyId, "empty".getBytes(), false));
    final ObjectId almostEmptyTreeId = new ObjectWriter(db).writeTree(almostEmptyTree);
    Commit commit = new Commit(db);
    commit.setTreeId(almostEmptyTreeId);
    commit.setAuthor(new PersonIdent("Joe H\u00e4cker","joe@example.com",4294967295000L,60));
    commit.setCommitter(new PersonIdent("Joe Hacker","joe2@example.com",4294967295000L,60));
    commit.setEncoding("UTF-8");
    commit.setMessage("\u00dcbergeeks");
    ObjectId cid = new ObjectWriter(db).writeCommit(commit);
    assertEquals("4680908112778718f37e686cbebcc912730b3154", cid.name());
    Commit loadedCommit = db.mapCommit(cid);
    assertNotSame(loadedCommit, commit);
    assertEquals(commit.getMessage(), loadedCommit.getMessage());
  }

  public void test024_createCommitNonAscii() throws IOException {
    final ObjectId emptyId = new ObjectWriter(db).writeBlob(new byte[0]);
    final Tree almostEmptyTree = new Tree(db);
    almostEmptyTree.addEntry(new FileTreeEntry(almostEmptyTree, emptyId, "empty".getBytes(), false));
    final ObjectId almostEmptyTreeId = new ObjectWriter(db).writeTree(almostEmptyTree);
    Commit commit = new Commit(db);
    commit.setTreeId(almostEmptyTreeId);
    commit.setAuthor(new PersonIdent("Joe H\u00e4cker","joe@example.com",4294967295000L,60));
    commit.setCommitter(new PersonIdent("Joe Hacker","joe2@example.com",4294967295000L,60));
    commit.setEncoding("ISO-8859-1");
    commit.setMessage("\u00dcbergeeks");
    ObjectId cid = new ObjectWriter(db).writeCommit(commit);
    assertEquals("2979b39d385014b33287054b87f77bcb3ecb5ebf", cid.name());
  }

  public void test025_packedRefs() throws IOException {
    test020_createBlobTag();
    test021_createTreeTag();
    test022_createCommitTag();

    if (!new File(db.getDirectory(),"refs/tags/test020").delete()) throw new Error("Cannot delete unpacked tag");
    if (!new File(db.getDirectory(),"refs/tags/test021").delete()) throw new Error("Cannot delete unpacked tag");
    if (!new File(db.getDirectory(),"refs/tags/test022").delete()) throw new Error("Cannot delete unpacked tag");

    // We cannot resolve it now, since we have no ref
    Tag mapTag20missing = db.mapTag("test020");
    assertNull(mapTag20missing);

    // Construct packed refs file
    PrintWriter w = new PrintWriter(new FileWriter(new File(db.getDirectory(), "packed-refs")));
    w.println("# packed-refs with: peeled");
    w.println("6759556b09fbb4fd8ae5e315134481cc25d46954 refs/tags/test020");
    w.println("^e69de29bb2d1d6434b8b29ae775ad8c2e48c5391");
    w.println("b0517bc8dbe2096b419d42424cd7030733f4abe5 refs/tags/test021");
    w.println("^417c01c8795a35b8e835113a85a5c0c1c77f67fb");
    w.println("0ce2ebdb36076ef0b38adbe077a07d43b43e3807 refs/tags/test022");
    w.println("^b5d3b45a96b340441f5abb9080411705c51cc86c");
    w.close();
    ((RefDirectory)db.getRefDatabase()).rescan();

    Tag mapTag20 = db.mapTag("test020");
    assertNotNull("have tag test020", mapTag20);
    assertEquals("blob", mapTag20.getType());
    assertEquals("test020 tagged\n", mapTag20.getMessage());
    assertEquals(new PersonIdent(author, 1154236443000L, -4 * 60), mapTag20.getAuthor());
    assertEquals("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391", mapTag20.getObjId().name());

    Tag mapTag21 = db.mapTag("test021");
    assertEquals("tree", mapTag21.getType());
    assertEquals("test021 tagged\n", mapTag21.getMessage());
    assertEquals(new PersonIdent(author, 1154236443000L, -4 * 60), mapTag21.getAuthor());
    assertEquals("417c01c8795a35b8e835113a85a5c0c1c77f67fb", mapTag21.getObjId().name());

    Tag mapTag22 = db.mapTag("test022");
    assertEquals("commit", mapTag22.getType());
    assertEquals("test022 tagged\n", mapTag22.getMessage());
    assertEquals(new PersonIdent(author, 1154236443000L, -4 * 60), mapTag22.getAuthor());
    assertEquals("b5d3b45a96b340441f5abb9080411705c51cc86c", mapTag22.getObjId().name());
  }

  public void test025_computeSha1NoStore() throws IOException {
    byte[] data = "test025 some data, more than 16 bytes to get good coverage"
        .getBytes("ISO-8859-1");
    // TODO: but we do not test legacy header writing
    final ObjectId id = new ObjectWriter(db).computeBlobSha1(data.length,
        new ByteArrayInputStream(data));
    assertEquals("4f561df5ecf0dfbd53a0dc0f37262fef075d9dde", id.name());
  }

  public void test026_CreateCommitMultipleparents() throws IOException {
    final Tree t = new Tree(db);
    final FileTreeEntry f = t.addFile("i-am-a-file");
    writeTrashFile(f.getName(), "and this is the data in me\n");
    t.accept(new WriteTree(trash, db), TreeEntry.MODIFIED_ONLY);
    assertEquals(ObjectId.fromString("00b1f73724f493096d1ffa0b0f1f1482dbb8c936"),
        t.getTreeId());

    final Commit c1 = new Commit(db);
    c1.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    c1.setCommitter(new PersonIdent(committer, 1154236443000L, -4 * 60));
    c1.setMessage("A Commit\n");
    c1.setTree(t);
    assertEquals(t.getTreeId(), c1.getTreeId());
    c1.commit();
    final ObjectId cmtid1 = ObjectId.fromString(
        "803aec4aba175e8ab1d666873c984c0308179099");
    assertEquals(cmtid1, c1.getCommitId());

    final Commit c2 = new Commit(db);
    c2.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    c2.setCommitter(new PersonIdent(committer, 1154236443000L, -4 * 60));
    c2.setMessage("A Commit 2\n");
    c2.setTree(t);
    assertEquals(t.getTreeId(), c2.getTreeId());
    c2.setParentIds(new ObjectId[] { c1.getCommitId() } );
    c2.commit();
    final ObjectId cmtid2 = ObjectId.fromString(
        "95d068687c91c5c044fb8c77c5154d5247901553");
    assertEquals(cmtid2, c2.getCommitId());

    Commit rm2 = db.mapCommit(cmtid2);
    assertNotSame(c2, rm2); // assert the parsed objects is not from the cache
    assertEquals(c2.getAuthor(), rm2.getAuthor());
    assertEquals(c2.getCommitId(), rm2.getCommitId());
    assertEquals(c2.getMessage(), rm2.getMessage());
    assertEquals(c2.getTree().getTreeId(), rm2.getTree().getTreeId());
    assertEquals(1, rm2.getParentIds().length);
    assertEquals(c1.getCommitId(), rm2.getParentIds()[0]);

    final Commit c3 = new Commit(db);
    c3.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    c3.setCommitter(new PersonIdent(committer, 1154236443000L, -4 * 60));
    c3.setMessage("A Commit 3\n");
    c3.setTree(t);
    assertEquals(t.getTreeId(), c3.getTreeId());
    c3.setParentIds(new ObjectId[] { c1.getCommitId(), c2.getCommitId() });
    c3.commit();
    final ObjectId cmtid3 = ObjectId.fromString(
        "ce6e1ce48fbeeb15a83f628dc8dc2debefa066f4");
    assertEquals(cmtid3, c3.getCommitId());

    Commit rm3 = db.mapCommit(cmtid3);
    assertNotSame(c3, rm3); // assert the parsed objects is not from the cache
    assertEquals(c3.getAuthor(), rm3.getAuthor());
    assertEquals(c3.getCommitId(), rm3.getCommitId());
    assertEquals(c3.getMessage(), rm3.getMessage());
    assertEquals(c3.getTree().getTreeId(), rm3.getTree().getTreeId());
    assertEquals(2, rm3.getParentIds().length);
    assertEquals(c1.getCommitId(), rm3.getParentIds()[0]);
    assertEquals(c2.getCommitId(), rm3.getParentIds()[1]);

    final Commit c4 = new Commit(db);
    c4.setAuthor(new PersonIdent(author, 1154236443000L, -4 * 60));
    c4.setCommitter(new PersonIdent(committer, 1154236443000L, -4 * 60));
    c4.setMessage("A Commit 4\n");
    c4.setTree(t);
    assertEquals(t.getTreeId(), c3.getTreeId());
    c4.setParentIds(new ObjectId[] { c1.getCommitId(), c2.getCommitId(), c3.getCommitId() });
    c4.commit();
    final ObjectId cmtid4 = ObjectId.fromString(
        "d1fca9fe3fef54e5212eb67902c8ed3e79736e27");
    assertEquals(cmtid4, c4.getCommitId());

    Commit rm4 = db.mapCommit(cmtid4);
    assertNotSame(c4, rm3); // assert the parsed objects is not from the cache
    assertEquals(c4.getAuthor(), rm4.getAuthor());
    assertEquals(c4.getCommitId(), rm4.getCommitId());
    assertEquals(c4.getMessage(), rm4.getMessage());
    assertEquals(c4.getTree().getTreeId(), rm4.getTree().getTreeId());
    assertEquals(3, rm4.getParentIds().length);
    assertEquals(c1.getCommitId(), rm4.getParentIds()[0]);
    assertEquals(c2.getCommitId(), rm4.getParentIds()[1]);
    assertEquals(c3.getCommitId(), rm4.getParentIds()[2]);
  }

  public void test027_UnpackedRefHigherPriorityThanPacked() throws IOException {
    PrintWriter writer = new PrintWriter(new FileWriter(new File(db.getDirectory(), "refs/heads/a")));
    String unpackedId = "7f822839a2fe9760f386cbbbcb3f92c5fe81def7";
    writer.print(unpackedId);
    writer.print('\n');
    writer.close();

    ObjectId resolved = db.resolve("refs/heads/a");
    assertEquals(unpackedId, resolved.name());
  }

  public void test028_LockPackedRef() throws IOException {
    writeTrashFile(".git/packed-refs", "7f822839a2fe9760f386cbbbcb3f92c5fe81def7 refs/heads/foobar");
    writeTrashFile(".git/HEAD", "ref: refs/heads/foobar\n");
    BUG_WorkAroundRacyGitIssues("packed-refs");
    BUG_WorkAroundRacyGitIssues("HEAD");

    ObjectId resolve = db.resolve("HEAD");
    assertEquals("7f822839a2fe9760f386cbbbcb3f92c5fe81def7", resolve.name());

    RefUpdate lockRef = db.updateRef("HEAD");
    ObjectId newId = ObjectId.fromString("07f822839a2fe9760f386cbbbcb3f92c5fe81def");
    lockRef.setNewObjectId(newId);
    assertEquals(RefUpdate.Result.FORCED, lockRef.forceUpdate());

    assertTrue(new File(db.getDirectory(), "refs/heads/foobar").exists());
    assertEquals(newId, db.resolve("refs/heads/foobar"));

    // Again. The ref already exists
    RefUpdate lockRef2 = db.updateRef("HEAD");
    ObjectId newId2 = ObjectId.fromString("7f822839a2fe9760f386cbbbcb3f92c5fe81def7");
    lockRef2.setNewObjectId(newId2);
    assertEquals(RefUpdate.Result.FORCED, lockRef2.forceUpdate());

    assertTrue(new File(db.getDirectory(), "refs/heads/foobar").exists());
    assertEquals(newId2, db.resolve("refs/heads/foobar"));
  }

  public void test029_mapObject() throws IOException {
    assertEquals(new byte[0].getClass(), db.mapObject(ObjectId.fromString("5b6e7c66c276e7610d4a73c70ec1a1f7c1003259"), null).getClass());
    assertEquals(Commit.class, db.mapObject(ObjectId.fromString("540a36d136cf413e4b064c2b0e0a4db60f77feab"), null).getClass());
    assertEquals(Tree.class, db.mapObject(ObjectId.fromString("aabf2ffaec9b497f0950352b3e582d73035c2035"), null).getClass());
    assertEquals(Tag.class, db.mapObject(ObjectId.fromString("17768080a2318cd89bba4c8b87834401e2095703"), null).getClass());
  }

  public void test30_stripWorkDir() {
    File relCwd = new File(".");
    File absCwd = relCwd.getAbsoluteFile();
    File absBase = new File(new File(absCwd, "repo"), "workdir");
    File relBase = new File(new File(relCwd, "repo"), "workdir");
    assertEquals(absBase.getAbsolutePath(), relBase.getAbsolutePath());

    File relBaseFile = new File(new File(relBase, "other"), "module.c");
    File absBaseFile = new File(new File(absBase, "other"), "module.c");
    assertEquals("other/module.c", Repository.stripWorkDir(relBase, relBaseFile));
    assertEquals("other/module.c", Repository.stripWorkDir(relBase, absBaseFile));
    assertEquals("other/module.c", Repository.stripWorkDir(absBase, relBaseFile));
    assertEquals("other/module.c", Repository.stripWorkDir(absBase, absBaseFile));

    File relNonFile = new File(new File(relCwd, "not-repo"), ".gitignore");
    File absNonFile = new File(new File(absCwd, "not-repo"), ".gitignore");
    assertEquals("", Repository.stripWorkDir(relBase, relNonFile));
    assertEquals("", Repository.stripWorkDir(absBase, absNonFile));

    assertEquals("", Repository.stripWorkDir(db.getWorkTree(), db.getWorkTree()));

    File file = new File(new File(db.getWorkTree(), "subdir"), "File.java");
    assertEquals("subdir/File.java", Repository.stripWorkDir(db.getWorkTree(), file));

  }

  /**
   * Kick the timestamp of a local file.
   * <p>
   * We shouldn't have to make these method calls. The cache is using file
   * system timestamps, and on many systems unit tests run faster than the
   * modification clock. Dumping the cache after we make an edit behind
   * RefDirectory's back allows the tests to pass.
   *
   * @param name
   *            the file in the repository to force a time change on.
   */
  private void BUG_WorkAroundRacyGitIssues(String name) {
    File path = new File(db.getDirectory(), name);
    long old = path.lastModified();
    long set = 1250379778668L; // Sat Aug 15 20:12:58 GMT-03:30 2009
    path.setLastModified(set);
    assertTrue("time changed", old != path.lastModified());
  }
}
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