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To support other storage models other than just the local filesystem, we split the Repository class into a nearly abstract interface and then create a concrete subclass called FileRepository with the file based IO implementation. We are using an abstract class for Repository rather than the much more generic interface, as implementers will want to inherit a large array of utility functions, such as resolve(String). Having these in a base class makes it easy to inherit them. This isn't the final home for lib.FileRepository. Future changes will rename it into storage.file.FileRepository, but to do that we need to also move a number of other related class, which we aren't quite ready to do. Change-Id: I1bd54ea0500337799a8e792874c272eb14d555f7 Signed-off-by: Shawn O. Pearce <spearce@spearce.org>stable-0.9
Shawn O. Pearce
15 years ago
12 changed files with 569 additions and 375 deletions
@ -0,0 +1,492 @@ |
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/* |
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* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com> |
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* Copyright (C) 2008-2010, Google Inc. |
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* Copyright (C) 2006-2010, Robin Rosenberg <robin.rosenberg@dewire.com> |
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* Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org> |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.lib; |
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import java.io.File; |
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import java.io.IOException; |
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import java.text.MessageFormat; |
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import java.util.Collection; |
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import java.util.HashSet; |
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import java.util.LinkedList; |
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import java.util.Set; |
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import org.eclipse.jgit.JGitText; |
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import org.eclipse.jgit.errors.ConfigInvalidException; |
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import org.eclipse.jgit.util.FS; |
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import org.eclipse.jgit.util.SystemReader; |
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/** |
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* Represents a Git repository. A repository holds all objects and refs used for |
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* managing source code (could by any type of file, but source code is what |
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* SCM's are typically used for). |
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* |
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* In Git terms all data is stored in GIT_DIR, typically a directory called |
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* .git. A work tree is maintained unless the repository is a bare repository. |
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* Typically the .git directory is located at the root of the work dir. |
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* |
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* <ul> |
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* <li>GIT_DIR |
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* <ul> |
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* <li>objects/ - objects</li> |
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* <li>refs/ - tags and heads</li> |
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* <li>config - configuration</li> |
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* <li>info/ - more configurations</li> |
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* </ul> |
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* </li> |
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* </ul> |
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* <p> |
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* This class is thread-safe. |
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* <p> |
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* This implementation only handles a subtly undocumented subset of git features. |
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* |
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*/ |
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public class FileRepository extends Repository { |
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private final FileBasedConfig userConfig; |
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private final FileBasedConfig repoConfig; |
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private final RefDatabase refs; |
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private final ObjectDirectory objectDatabase; |
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/** |
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* Construct a representation of a Git repository. |
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* |
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* The work tree, object directory, alternate object directories and index |
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* file locations are deduced from the given git directory and the default |
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* rules. |
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* |
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* @param d |
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* GIT_DIR (the location of the repository metadata). |
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* @throws IOException |
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* the repository appears to already exist but cannot be |
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* accessed. |
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*/ |
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public FileRepository(final File d) throws IOException { |
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this(d, null, null, null, null); // go figure it out
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} |
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/** |
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* Construct a representation of a Git repository. |
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* |
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* The work tree, object directory, alternate object directories and index |
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* file locations are deduced from the given git directory and the default |
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* rules. |
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* |
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* @param d |
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* GIT_DIR (the location of the repository metadata). May be |
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* null work workTree is set |
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* @param workTree |
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* GIT_WORK_TREE (the root of the checkout). May be null for |
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* default value. |
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* @throws IOException |
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* the repository appears to already exist but cannot be |
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* accessed. |
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*/ |
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public FileRepository(final File d, final File workTree) throws IOException { |
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this(d, workTree, null, null, null); // go figure it out
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} |
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/** |
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* Construct a representation of a Git repository using the given parameters |
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* possibly overriding default conventions. |
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* |
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* @param d |
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* GIT_DIR (the location of the repository metadata). May be null |
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* for default value in which case it depends on GIT_WORK_TREE. |
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* @param workTree |
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* GIT_WORK_TREE (the root of the checkout). May be null for |
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* default value if GIT_DIR is provided. |
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* @param objectDir |
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* GIT_OBJECT_DIRECTORY (where objects and are stored). May be |
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* null for default value. Relative names ares resolved against |
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* GIT_WORK_TREE. |
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* @param alternateObjectDir |
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* GIT_ALTERNATE_OBJECT_DIRECTORIES (where more objects are read |
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* from). May be null for default value. Relative names ares |
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* resolved against GIT_WORK_TREE. |
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* @param indexFile |
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* GIT_INDEX_FILE (the location of the index file). May be null |
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* for default value. Relative names ares resolved against |
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* GIT_WORK_TREE. |
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* @throws IOException |
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* the repository appears to already exist but cannot be |
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* accessed. |
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*/ |
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public FileRepository(final File d, final File workTree, final File objectDir, |
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final File[] alternateObjectDir, final File indexFile) throws IOException { |
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this(d, workTree, objectDir, alternateObjectDir, indexFile, FS.DETECTED); |
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} |
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/** |
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* Construct a representation of a Git repository using the given parameters |
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* possibly overriding default conventions. |
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* |
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* @param d |
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* GIT_DIR (the location of the repository metadata). May be null |
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* for default value in which case it depends on GIT_WORK_TREE. |
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* @param workTree |
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* GIT_WORK_TREE (the root of the checkout). May be null for |
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* default value if GIT_DIR is provided. |
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* @param objectDir |
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* GIT_OBJECT_DIRECTORY (where objects and are stored). May be |
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* null for default value. Relative names ares resolved against |
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* GIT_WORK_TREE. |
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* @param alternateObjectDir |
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* GIT_ALTERNATE_OBJECT_DIRECTORIES (where more objects are read |
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* from). May be null for default value. Relative names ares |
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* resolved against GIT_WORK_TREE. |
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* @param indexFile |
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* GIT_INDEX_FILE (the location of the index file). May be null |
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* for default value. Relative names ares resolved against |
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* GIT_WORK_TREE. |
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* @param fs |
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* the file system abstraction which will be necessary to |
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* perform certain file system operations. |
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* @throws IOException |
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* the repository appears to already exist but cannot be |
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* accessed. |
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*/ |
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public FileRepository(final File d, final File workTree, final File objectDir, |
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final File[] alternateObjectDir, final File indexFile, FS fs) |
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throws IOException { |
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if (workTree != null) { |
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workDir = workTree; |
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if (d == null) |
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gitDir = new File(workTree, Constants.DOT_GIT); |
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else |
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gitDir = d; |
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} else { |
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if (d != null) |
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gitDir = d; |
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else |
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throw new IllegalArgumentException( |
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JGitText.get().eitherGIT_DIRorGIT_WORK_TREEmustBePassed); |
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} |
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this.fs = fs; |
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userConfig = SystemReader.getInstance().openUserConfig(fs); |
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repoConfig = new FileBasedConfig(userConfig, fs.resolve(gitDir, "config")); |
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loadUserConfig(); |
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loadRepoConfig(); |
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if (workDir == null) { |
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// if the working directory was not provided explicitly,
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// we need to decide if this is a "bare" repository or not
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// first, we check the working tree configuration
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String workTreeConfig = getConfig().getString( |
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ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_WORKTREE); |
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if (workTreeConfig != null) { |
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// the working tree configuration wins
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workDir = fs.resolve(d, workTreeConfig); |
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} else if (getConfig().getString( |
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ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_BARE) != null) { |
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// we have asserted that a value for the "bare" flag was set
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if (!getConfig().getBoolean(ConfigConstants.CONFIG_CORE_SECTION, |
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ConfigConstants.CONFIG_KEY_BARE, true)) |
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// the "bare" flag is false -> use the parent of the
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// meta data directory
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workDir = gitDir.getParentFile(); |
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else |
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// the "bare" flag is true
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workDir = null; |
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} else if (Constants.DOT_GIT.equals(gitDir.getName())) { |
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// no value for the "bare" flag, but the meta data directory
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// is named ".git" -> use the parent of the meta data directory
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workDir = gitDir.getParentFile(); |
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} else { |
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workDir = null; |
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} |
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} |
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refs = new RefDirectory(this); |
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if (objectDir != null) |
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objectDatabase = new ObjectDirectory(fs.resolve(objectDir, ""), |
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alternateObjectDir, fs); |
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else |
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objectDatabase = new ObjectDirectory(fs.resolve(gitDir, "objects"), |
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alternateObjectDir, fs); |
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if (indexFile != null) |
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this.indexFile = indexFile; |
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else |
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this.indexFile = new File(gitDir, "index"); |
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if (objectDatabase.exists()) { |
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final String repositoryFormatVersion = getConfig().getString( |
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ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_REPO_FORMAT_VERSION); |
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if (!"0".equals(repositoryFormatVersion)) { |
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throw new IOException(MessageFormat.format( |
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JGitText.get().unknownRepositoryFormat2, |
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repositoryFormatVersion)); |
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} |
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} |
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} |
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private void loadUserConfig() throws IOException { |
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try { |
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userConfig.load(); |
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} catch (ConfigInvalidException e1) { |
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IOException e2 = new IOException(MessageFormat.format(JGitText |
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.get().userConfigFileInvalid, userConfig.getFile() |
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.getAbsolutePath(), e1)); |
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e2.initCause(e1); |
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throw e2; |
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} |
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} |
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private void loadRepoConfig() throws IOException { |
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try { |
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repoConfig.load(); |
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} catch (ConfigInvalidException e1) { |
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IOException e2 = new IOException(JGitText.get().unknownRepositoryFormat); |
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e2.initCause(e1); |
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throw e2; |
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} |
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} |
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/** |
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* Create a new Git repository initializing the necessary files and |
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* directories. |
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* |
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* @param bare |
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* if true, a bare repository is created. |
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* |
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* @throws IOException |
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* in case of IO problem |
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*/ |
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public void create(boolean bare) throws IOException { |
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final FileBasedConfig cfg = getConfig(); |
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if (cfg.getFile().exists()) { |
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throw new IllegalStateException(MessageFormat.format( |
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JGitText.get().repositoryAlreadyExists, gitDir)); |
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} |
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gitDir.mkdirs(); |
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refs.create(); |
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objectDatabase.create(); |
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new File(gitDir, "branches").mkdir(); |
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RefUpdate head = updateRef(Constants.HEAD); |
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head.disableRefLog(); |
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head.link(Constants.R_HEADS + Constants.MASTER); |
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cfg.setInt(ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_REPO_FORMAT_VERSION, 0); |
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cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_FILEMODE, true); |
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if (bare) |
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cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_BARE, true); |
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cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_LOGALLREFUPDATES, !bare); |
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cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null, |
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ConfigConstants.CONFIG_KEY_AUTOCRLF, false); |
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cfg.save(); |
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} |
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/** |
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* @return the directory containing the objects owned by this repository. |
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*/ |
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public File getObjectsDirectory() { |
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return objectDatabase.getDirectory(); |
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} |
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/** |
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* @return the object database which stores this repository's data. |
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*/ |
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public ObjectDirectory getObjectDatabase() { |
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return objectDatabase; |
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} |
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/** @return the reference database which stores the reference namespace. */ |
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public RefDatabase getRefDatabase() { |
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return refs; |
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} |
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/** |
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* @return the configuration of this repository |
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*/ |
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public FileBasedConfig getConfig() { |
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if (userConfig.isOutdated()) { |
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try { |
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loadUserConfig(); |
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} catch (IOException e) { |
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throw new RuntimeException(e); |
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} |
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} |
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if (repoConfig.isOutdated()) { |
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try { |
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loadRepoConfig(); |
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} catch (IOException e) { |
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throw new RuntimeException(e); |
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} |
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} |
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return repoConfig; |
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} |
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/** |
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* Construct a filename where the loose object having a specified SHA-1 |
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* should be stored. If the object is stored in a shared repository the path |
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* to the alternative repo will be returned. If the object is not yet store |
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* a usable path in this repo will be returned. It is assumed that callers |
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* will look for objects in a pack first. |
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* |
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* @param objectId |
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* @return suggested file name |
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*/ |
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public File toFile(final AnyObjectId objectId) { |
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return objectDatabase.fileFor(objectId); |
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} |
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/** |
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* Open object in all packs containing specified object. |
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* |
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* @param objectId |
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* id of object to search for |
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* @param curs |
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* temporary working space associated with the calling thread. |
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* @return collection of loaders for this object, from all packs containing |
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* this object |
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* @throws IOException |
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*/ |
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public Collection<PackedObjectLoader> openObjectInAllPacks( |
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final AnyObjectId objectId, final WindowCursor curs) |
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throws IOException { |
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Collection<PackedObjectLoader> result = new LinkedList<PackedObjectLoader>(); |
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openObjectInAllPacks(objectId, result, curs); |
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return result; |
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} |
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/** |
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* Open object in all packs containing specified object. |
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* |
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* @param objectId |
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* id of object to search for |
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* @param resultLoaders |
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* result collection of loaders for this object, filled with |
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* loaders from all packs containing specified object |
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* @param curs |
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* temporary working space associated with the calling thread. |
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* @throws IOException |
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*/ |
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void openObjectInAllPacks(final AnyObjectId objectId, |
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final Collection<PackedObjectLoader> resultLoaders, |
||||||
|
final WindowCursor curs) throws IOException { |
||||||
|
objectDatabase.openObjectInAllPacks(resultLoaders, curs, objectId); |
||||||
|
} |
||||||
|
|
||||||
|
/** |
||||||
|
* Objects known to exist but not expressed by {@link #getAllRefs()}. |
||||||
|
* <p> |
||||||
|
* When a repository borrows objects from another repository, it can |
||||||
|
* advertise that it safely has that other repository's references, without |
||||||
|
* exposing any other details about the other repository. This may help |
||||||
|
* a client trying to push changes avoid pushing more than it needs to. |
||||||
|
* |
||||||
|
* @return unmodifiable collection of other known objects. |
||||||
|
*/ |
||||||
|
public Set<ObjectId> getAdditionalHaves() { |
||||||
|
HashSet<ObjectId> r = new HashSet<ObjectId>(); |
||||||
|
for (ObjectDatabase d : getObjectDatabase().getAlternates()) { |
||||||
|
if (d instanceof AlternateRepositoryDatabase) { |
||||||
|
Repository repo; |
||||||
|
|
||||||
|
repo = ((AlternateRepositoryDatabase) d).getRepository(); |
||||||
|
for (Ref ref : repo.getAllRefs().values()) |
||||||
|
r.add(ref.getObjectId()); |
||||||
|
r.addAll(repo.getAdditionalHaves()); |
||||||
|
} |
||||||
|
} |
||||||
|
return r; |
||||||
|
} |
||||||
|
|
||||||
|
/** |
||||||
|
* Add a single existing pack to the list of available pack files. |
||||||
|
* |
||||||
|
* @param pack |
||||||
|
* path of the pack file to open. |
||||||
|
* @param idx |
||||||
|
* path of the corresponding index file. |
||||||
|
* @throws IOException |
||||||
|
* index file could not be opened, read, or is not recognized as |
||||||
|
* a Git pack file index. |
||||||
|
*/ |
||||||
|
public void openPack(final File pack, final File idx) throws IOException { |
||||||
|
objectDatabase.openPack(pack, idx); |
||||||
|
} |
||||||
|
|
||||||
|
/** |
||||||
|
* Force a scan for changed refs. |
||||||
|
* |
||||||
|
* @throws IOException |
||||||
|
*/ |
||||||
|
public void scanForRepoChanges() throws IOException { |
||||||
|
getAllRefs(); // This will look for changes to refs
|
||||||
|
if (!isBare()) |
||||||
|
getIndex(); // This will detect changes in the index
|
||||||
|
} |
||||||
|
|
||||||
|
/** |
||||||
|
* @param refName |
||||||
|
* @return a {@link ReflogReader} for the supplied refname, or null if the |
||||||
|
* named ref does not exist. |
||||||
|
* @throws IOException the ref could not be accessed. |
||||||
|
*/ |
||||||
|
public ReflogReader getReflogReader(String refName) throws IOException { |
||||||
|
Ref ref = getRef(refName); |
||||||
|
if (ref != null) |
||||||
|
return new ReflogReader(this, ref.getName()); |
||||||
|
return null; |
||||||
|
} |
||||||
|
} |
||||||
Loading…
Reference in new issue