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// Copyright (C) 2017 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.util.stream.Collectors.toSet;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.RefUpdate.Result;
import org.eclipse.jgit.lib.Repository;
/** Delete user branches for which no account exists. */
public class Schema_147 extends SchemaVersion {
private final GitRepositoryManager repoManager;
private final AllUsersName allUsersName;
@Inject
Schema_147(
Provider<Schema_146> prior, GitRepositoryManager repoManager, AllUsersName allUsersName) {
super(prior);
this.repoManager = repoManager;
this.allUsersName = allUsersName;
}
@Override
protected void migrateData(ReviewDb db, UpdateUI ui) throws OrmException, SQLException {
try (Repository repo = repoManager.openRepository(allUsersName)) {
Set<Account.Id> accountIdsFromReviewDb = scanAccounts(db);
Set<Account.Id> accountIdsFromUserBranches =
repo.getRefDatabase().getRefsByPrefix(RefNames.REFS_USERS).stream()
.map(r -> Account.Id.fromRef(r.getName()))
.filter(Objects::nonNull)
.collect(toSet());
accountIdsFromUserBranches.removeAll(accountIdsFromReviewDb);
for (Account.Id accountId : accountIdsFromUserBranches) {
deleteUserBranch(repo, accountId);
}
} catch (IOException e) {
throw new OrmException("Failed to delete user branches for non-existing accounts.", e);
}
}
private Set<Account.Id> scanAccounts(ReviewDb db) throws SQLException {
try (Statement stmt = newStatement(db);
ResultSet rs = stmt.executeQuery("SELECT account_id FROM accounts")) {
Set<Account.Id> ids = new HashSet<>();
while (rs.next()) {
ids.add(new Account.Id(rs.getInt(1)));
}
return ids;
}
}
private void deleteUserBranch(Repository allUsersRepo, Account.Id accountId) throws IOException {
String refName = RefNames.refsUsers(accountId);
Ref ref = allUsersRepo.exactRef(refName);
if (ref == null) {
return;
}
RefUpdate ru = allUsersRepo.updateRef(refName);
ru.setExpectedOldObjectId(ref.getObjectId());
ru.setNewObjectId(ObjectId.zeroId());
ru.setForceUpdate(true);
Result result = ru.delete();
if (result != Result.FORCED) {
throw new IOException(String.format("Failed to delete ref %s: %s", refName, result.name()));
}
}
}
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