gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_106.java

// Copyright (C) 2015 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.server.schema;

import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.GerritPersonIdent;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.LocalDiskRepositoryManager;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.SortedSet;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Repository;

public class Schema_106 extends SchemaVersion {
  // we can use multiple threads per CPU as we can expect that threads will be
  // waiting for IO
  private static final int THREADS_PER_CPU = 4;
  private final GitRepositoryManager repoManager;
  private final PersonIdent serverUser;
  private int repoCount;

  @Inject
  Schema_106(
      Provider<Schema_105> prior,
      GitRepositoryManager repoManager,
      @GerritPersonIdent PersonIdent serverUser) {
    super(prior);
    this.repoManager = repoManager;
    this.serverUser = serverUser;
  }

  @Override
  protected void migrateData(ReviewDb db, UpdateUI ui) throws OrmException {
    if (!(repoManager instanceof LocalDiskRepositoryManager)) {
      return;
    }

    ui.message("listing all repositories ...");
    SortedSet<Project.NameKey> repoList = repoManager.list();
    repoCount = repoList.size();
    ui.message("done");

    ui.message(String.format("creating reflog files for %s branches ...", RefNames.REFS_CONFIG));

    runParallelTasks(
        createExecutor(ui), repoList, (repo) -> createRefLog((Project.NameKey) repo), ui);
  }

  @Override
  protected int getThreads() {
    return Math.min(Runtime.getRuntime().availableProcessors() * THREADS_PER_CPU, repoCount);
  }

  public Void createRefLog(Project.NameKey project) throws IOException {
    try (Repository repo = repoManager.openRepository(project)) {
      File metaConfigLog = new File(repo.getDirectory(), "logs/" + RefNames.REFS_CONFIG);
      if (metaConfigLog.exists()) {
        return null;
      }

      if (!metaConfigLog.getParentFile().mkdirs() || !metaConfigLog.createNewFile()) {
        throw new IOException();
      }

      ObjectId metaConfigId = repo.resolve(RefNames.REFS_CONFIG);
      if (metaConfigId != null) {
        try (PrintWriter writer = new PrintWriter(metaConfigLog, UTF_8.name())) {
          writer.print(ObjectId.zeroId().name());
          writer.print(" ");
          writer.print(metaConfigId.name());
          writer.print(" ");
          writer.print(serverUser.toExternalString());
          writer.print("\t");
          writer.print("create reflog");
          writer.println();
        }
      }
      return null;
    } catch (IOException e) {
      throw new IOException(
          String.format(
              "ERROR: Failed to create reflog file for the %s branch in repository %s",
              RefNames.REFS_CONFIG, project.get()));
    }
  }
}