com.google.gerrit.pgm.init.AllProjectsConfig.java Source code

Introduction

Here is the source code for com.google.gerrit.pgm.init.AllProjectsConfig.java

Source

// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.pgm.init;

import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.git.ProjectConfig;
import com.google.gerrit.server.git.VersionedMetaData;
import com.google.inject.Inject;

import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryCache.FileKey;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.util.FS;

import java.io.File;
import java.io.IOException;

public class AllProjectsConfig extends VersionedMetaData {
    private final String project;
    private final SitePaths site;
    private final InitFlags flags;

    private Config cfg;
    private ObjectId revision;

    @Inject
    AllProjectsConfig(AllProjectsNameOnInitProvider allProjects, SitePaths site, InitFlags flags) {
        this.project = allProjects.get();
        this.site = site;
        this.flags = flags;

    }

    @Override
    protected String getRefName() {
        return RefNames.REFS_CONFIG;
    }

    private File getPath() {
        File basePath = site.resolve(flags.cfg.getString("gerrit", null, "basePath"));
        if (basePath == null) {
            throw new IllegalStateException("gerrit.basePath must be configured");
        }
        return FileKey.resolve(new File(basePath, project), FS.DETECTED);
    }

    public Config load() throws IOException, ConfigInvalidException {
        File path = getPath();
        if (path == null) {
            return null;
        }

        Repository repo = new FileRepository(path);
        try {
            load(repo);
        } finally {
            repo.close();
        }
        return cfg;
    }

    @Override
    protected void onLoad() throws IOException, ConfigInvalidException {
        cfg = readConfig(ProjectConfig.PROJECT_CONFIG);
        revision = getRevision();
    }

    @Override
    protected boolean onSave(CommitBuilder commit) throws IOException, ConfigInvalidException {
        throw new UnsupportedOperationException();
    }

    void save(String message) throws IOException {
        save(new PersonIdent("Gerrit Initialization", "init@gerrit"), message);
    }

    public void save(String pluginName, String message) throws IOException {
        save(new PersonIdent(pluginName, pluginName + "@gerrit"),
                "Update from plugin " + pluginName + ": " + message);
    }

    private void save(PersonIdent ident, String msg) throws IOException {
        File path = getPath();
        if (path == null) {
            throw new IOException("All-Projects does not exist.");
        }

        Repository repo = new FileRepository(path);
        try {
            inserter = repo.newObjectInserter();
            reader = repo.newObjectReader();
            try {
                RevWalk rw = new RevWalk(reader);
                try {
                    RevTree srcTree = revision != null ? rw.parseTree(revision) : null;
                    newTree = readTree(srcTree);
                    saveConfig(ProjectConfig.PROJECT_CONFIG, cfg);
                    ObjectId res = newTree.writeTree(inserter);
                    if (res.equals(srcTree)) {
                        // If there are no changes to the content, don't create the commit.
                        return;
                    }

                    CommitBuilder commit = new CommitBuilder();
                    commit.setAuthor(ident);
                    commit.setCommitter(ident);
                    commit.setMessage(msg);
                    commit.setTreeId(res);
                    if (revision != null) {
                        commit.addParentId(revision);
                    }
                    ObjectId newRevision = inserter.insert(commit);
                    updateRef(repo, ident, newRevision, "commit: " + msg);
                    revision = newRevision;
                } finally {
                    rw.release();
                }
            } finally {
                if (inserter != null) {
                    inserter.release();
                    inserter = null;
                }
                if (reader != null) {
                    reader.release();
                    reader = null;
                }
            }
        } finally {
            repo.close();
        }
    }

    private void updateRef(Repository repo, PersonIdent ident, ObjectId newRevision, String refLogMsg)
            throws IOException {
        RefUpdate ru = repo.updateRef(getRefName());
        ru.setRefLogIdent(ident);
        ru.setNewObjectId(newRevision);
        ru.setExpectedOldObjectId(revision);
        ru.setRefLogMessage(refLogMsg, false);
        RefUpdate.Result r = ru.update();
        switch (r) {
        case FAST_FORWARD:
        case NEW:
        case NO_CHANGE:
            break;
        default:
            throw new IOException("Failed to update " + getRefName() + " of " + project + ": " + r.name());
        }
    }
}