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/*******************************************************************************
* Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2007, Shawn O. Pearce <spearce@spearce.org>
* Copyright (C) 2008, Google Inc.
* Copyright (C) 2012, François Rey <eclipse.org_@_francois_._rey_._name>
* Copyright (C) 2013, Carsten Pfeiffer <carsten.pfeiffer@gebit.de>
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.egit.core.project;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.egit.core.internal.CoreText;
import org.eclipse.egit.core.internal.trace.GitTraceLocation;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.RepositoryCache.FileKey;
import org.eclipse.jgit.util.FS;
import org.eclipse.jgit.util.SystemReader;
/**
* Searches for existing Git repositories associated with a project's files.
* <p>
* This finder algorithm searches a project's contained files to see if any of
* them are located within the working directory of an existing Git repository.
* By default linked resources are ignored and not included in the search.
* </p>
* <p>
* The search algorithm is exhaustive, it will find all matching repositories.
* For the project itself and possibly for each linked container within the
* project it scans down the local filesystem trees to locate any Git
* repositories which may be found there. It also scans up the local filesystem
* tree to locate any Git repository which may be outside of Eclipse's
* workspace-view of the world.
* In short, if there is a Git repository associated, it finds it.
* </p>
*/
public class RepositoryFinder {
private final IProject proj;
private final Collection<RepositoryMapping> results = new ArrayList<RepositoryMapping>();
private final Set<File> gitdirs = new HashSet<File>();
private Set<String> ceilingDirectories = new HashSet<String>();
/**
* Create a new finder to locate Git repositories for a project.
*
* @param p
* the project this new finder should locate the existing Git
* repositories of.
*/
public RepositoryFinder(final IProject p) {
proj = p;
String ceilingDirectoriesVar = SystemReader.getInstance().getenv(
Constants.GIT_CEILING_DIRECTORIES_KEY);
if (ceilingDirectoriesVar != null) {
ceilingDirectories.addAll(Arrays.asList(ceilingDirectoriesVar
.split(File.pathSeparator)));
}
}
/**
* Run the search algorithm, ignoring linked resources.
*
* @param m
* a progress monitor to report feedback to; may be null.
* @return all found {@link RepositoryMapping} instances associated with the
* project supplied to this instance's constructor.
* @throws CoreException
* Eclipse was unable to access its workspace, and threw up on
* us. We're throwing it back at the caller.
*/
public Collection<RepositoryMapping> find(IProgressMonitor m)
throws CoreException {
return find(m, false);
}
/**
* Run the search algorithm.
*
* @param m
* a progress monitor to report feedback to; may be null.
* @param searchLinkedFolders
* specify if linked folders should be included in the search
* @return all found {@link RepositoryMapping} instances associated with the
* project supplied to this instance's constructor.
* @throws CoreException
* Eclipse was unable to access its workspace, and threw up on
* us. We're throwing it back at the caller.
* @since 2.3
*/
public Collection<RepositoryMapping> find(IProgressMonitor m, boolean searchLinkedFolders)
throws CoreException {
IProgressMonitor monitor;
if (m == null)
monitor = new NullProgressMonitor();
else
monitor = m;
find(monitor, proj, searchLinkedFolders);
return results;
}
private void find(final IProgressMonitor m, final IContainer c, boolean searchLinkedFolders)
throws CoreException {
if (!searchLinkedFolders && c.isLinked())
return; // Ignore linked folders
final IPath loc = c.getLocation();
m.beginTask("", 101); //$NON-NLS-1$
m.subTask(CoreText.RepositoryFinder_finding);
try {
if (loc != null) {
final File fsLoc = loc.toFile();
assert fsLoc.isAbsolute();
final File ownCfg = configFor(fsLoc);
final IResource[] children;
final FS fs = FS.detect();
if (ownCfg.isFile()
&& FileKey.isGitRepository(ownCfg.getParentFile(), fs)) {
register(c, ownCfg.getParentFile());
}
if (c instanceof IProject) {
File p = fsLoc.getParentFile();
while (p != null) {
// TODO is this the right location?
if (GitTraceLocation.CORE.isActive())
GitTraceLocation.getTrace().trace(
GitTraceLocation.CORE.getLocation(),
"Looking at candidate dir: " //$NON-NLS-1$
+ p);
final File pCfg = configFor(p);
if (pCfg.isFile()
&& FileKey.isGitRepository(
pCfg.getParentFile(), fs)) {
register(c, pCfg.getParentFile());
}
if (ceilingDirectories.contains(p.getPath()))
break;
p = p.getParentFile();
}
}
m.worked(1);
children = c.members();
if (children != null && children.length > 0) {
final int scale = 100 / children.length;
for (int k = 0; k < children.length; k++) {
final IResource o = children[k];
if (o instanceof IContainer
&& !o.getName().equals(Constants.DOT_GIT)) {
find(new SubProgressMonitor(m, scale),
(IContainer) o, searchLinkedFolders);
} else {
m.worked(scale);
}
}
}
}
} finally {
m.done();
}
}
private File configFor(final File fsLoc) {
return new File(new File(fsLoc, Constants.DOT_GIT),
"config"); //$NON-NLS-1$
}
private void register(final IContainer c, final File gitdir) {
File f = gitdir.getAbsoluteFile();
if (gitdirs.contains(f))
return;
gitdirs.add(f);
results.add(new RepositoryMapping(c, f));
}
}
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