org.kercoin.magrit.core.utils.GitUtils.java Source code

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Here is the source code for org.kercoin.magrit.core.utils.GitUtils.java

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/*
Copyright 2011 Frederic Menou
    
This file is part of Magrit.
    
Magrit is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
    
Magrit is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public
License along with Magrit.
If not, see <http://www.gnu.org/licenses/>.
*/
package org.kercoin.magrit.core.utils;

import java.io.File;
import java.io.IOException;
import java.util.regex.Pattern;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.InvalidRefNameException;
import org.eclipse.jgit.api.errors.InvalidRemoteException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
import org.eclipse.jgit.api.errors.RefNotFoundException;
import org.eclipse.jgit.errors.AmbiguousObjectException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryBuilder;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;

import com.google.inject.Singleton;

@Singleton
public class GitUtils {

    private static final String REF_SPEC_PATTERN = "+refs/heads/*:refs/remotes/%s/*";

    public void addRemote(Repository toConfigure, String name, Repository remoteRepo) throws IOException {
        final String refSpec = String.format(REF_SPEC_PATTERN, name);
        File dest = remoteRepo.getDirectory();
        if (!remoteRepo.isBare()) {
            dest = dest.getParentFile();
        }
        synchronized (toConfigure) {
            toConfigure.getConfig().setString("remote", name, "fetch", refSpec);
            toConfigure.getConfig().setString("remote", name, "url", dest.getAbsolutePath());
            // write down configuration in .git/config
            toConfigure.getConfig().save();
        }
    }

    public void fetch(Repository repository, String remote) throws JGitInternalException, InvalidRemoteException {
        Git.wrap(repository).fetch().setRemote(remote).call();
    }

    public RevCommit getCommit(Repository repo, String revstr)
            throws MissingObjectException, IncorrectObjectTypeException, AmbiguousObjectException, IOException {
        ObjectId ref = repo.resolve(revstr);
        if (ref == null)
            return null;
        RevWalk walk = new RevWalk(repo);
        try {
            return walk.parseCommit(ref);
        } finally {
            walk.dispose();
        }
    }

    public boolean containsCommit(Repository repository, String revstr) {
        try {
            return getCommit(repository, revstr) != null;
        } catch (IOException e) {
            return false;
        }
    }

    public byte[] showBytes(Repository repository, String revstr) throws AmbiguousObjectException, IOException {
        ObjectId ref = repository.resolve(revstr);
        if (ref == null) {
            return null;
        }
        return repository.getObjectDatabase().newReader().open(ref).getBytes();
    }

    public String show(Repository repository, String revstr) throws AmbiguousObjectException, IOException {
        byte[] bytes = showBytes(repository, revstr);
        if (bytes == null) {
            return null;
        }
        return new String(bytes, "UTF-8");
    }

    public boolean isSha1(String candidate) {
        if (candidate.length() != 40) {
            return false;
        }
        return Pattern.compile("[0-9a-f]{40}").matcher(candidate).matches();
    }

    public Repository createRepository(File fullPath) throws IOException {
        RepositoryBuilder builder = new RepositoryBuilder();
        builder.setGitDir(fullPath);
        return builder.build();
    }

    public String getTree(Repository repo, String commitSha1) {
        try {
            RevCommit commit = getCommit(repo, commitSha1);
            if (commit == null) {
                return null;
            }
            final RevTree tree = commit.getTree();
            if (tree == null) {
                return null;
            }
            return tree.getName();
        } catch (IOException e) {
            return null;
        }
    }

    public void checkoutAsBranch(Repository repository, String commitSha1, String branchName)
            throws RefNotFoundException, InvalidRefNameException {
        try {
            Git.wrap(repository).checkout().setCreateBranch(true).setName(branchName).setStartPoint(commitSha1)
                    .call();
        } catch (RefAlreadyExistsException e) {
            // It's ok!
        }
    }
}