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Extract InitGitDBRepo.create()

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This commit is contained in:
Paul Campbell 2018-06-13 20:46:51 +01:00
parent 2246513bee
commit 837032b205
2 changed files with 114 additions and 68 deletions
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69
src/main/java/net/kemitix/gitdb/GitDBLocal.java
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@ -24,14 +24,8 @@ package net.kemitix.gitdb;
import lombok.RequiredArgsConstructor;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.lib.*;
import org.eclipse.jgit.util.FS;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.Files;
import java.nio.file.NotDirectoryException;
import java.nio.file.Path;
import java.util.Optional;
@ -43,14 +37,8 @@ import java.util.Optional;
@RequiredArgsConstructor
class GitDBLocal implements GitDB {
private static final String INIT_MESSAGE = "Initialise GitDB v1";
private static final String INIT_USER = "GitDB";
private static final String INIT_EMAIL = "pcampbell@kemitix.net";
private static final String MASTER = "master";
private static final String IS_GIT_DB = "isGitDB";
private static final String NOT_A_BARE_REPO = "Not a bare repo";
private static final String ERROR_OPENING_REPOSITORY = "Error opening repository";
private static final String REFS_HEADS_FORMAT = "refs/heads/%s";
private final Repository repository;
private final String userName;
@ -94,65 +82,10 @@ class GitDBLocal implements GitDB {
final String userName,
final String userEmailAddress
) throws IOException {
initRepo(validDbDir(dbDir.toFile()));
InitGitDBRepo.create(dbDir);
return open(dbDir, userName, userEmailAddress);
}
private static File validDbDir(final File dbDir) throws IOException {
verifyIsNotAFile(dbDir);
if (dbDir.exists()) {
verifyIsEmpty(dbDir);
}
return dbDir;
}
private static void verifyIsEmpty(final File dbDir) throws IOException {
if (Files.newDirectoryStream(dbDir.toPath()).iterator().hasNext()) {
throw new DirectoryNotEmptyException(dbDir.toString());
}
}
private static void verifyIsNotAFile(final File dbDir) throws NotDirectoryException {
if (dbDir.isFile()) {
throw new NotDirectoryException(dbDir.toString());
}
}
private static void initRepo(final File dbDir) throws IOException {
dbDir.mkdirs();
final Repository repository = RepositoryCache.FileKey.exact(dbDir, FS.DETECTED).open(false);
repository.create(true);
createInitialBranchOnMaster(repository);
}
private static void createInitialBranchOnMaster(final Repository repository) throws IOException {
final GitDBRepo repo = GitDBRepo.in(repository);
final ObjectId objectId = repo.insertBlob(new byte[0]);
final ObjectId treeId = repo.insertNewTree(IS_GIT_DB, objectId);
final ObjectId commitId = repo.insertCommit(treeId, INIT_MESSAGE, INIT_USER, INIT_EMAIL, ObjectId.zeroId());
createBranch(repository, commitId, MASTER);
}
private static void createBranch(
final Repository repository,
final ObjectId commitId,
final String branchName
) throws IOException {
final Path branchRefPath = branchRefPath(repository, branchName);
final byte[] commitIdBytes = commitId.name().getBytes(StandardCharsets.UTF_8);
Files.write(branchRefPath, commitIdBytes);
}
private static Path branchRefPath(
final Repository repository,
final String branchName
) {
return repository.getDirectory()
.toPath()
.resolve(String.format(REFS_HEADS_FORMAT, branchName))
.toAbsolutePath();
}
@Override
public Optional<GitDBBranch> branch(final String name) throws IOException {
return Optional.ofNullable(repository.findRef(name))

113
src/main/java/net/kemitix/gitdb/InitGitDBRepo.java Normal file
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@ -0,0 +1,113 @@
/*
The MIT License (MIT)
Copyright (c) 2018 Paul Campbell
Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies
or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package net.kemitix.gitdb;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryCache;
import org.eclipse.jgit.util.FS;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.Files;
import java.nio.file.NotDirectoryException;
import java.nio.file.Path;
/**
* Initialise a new GitDB Repo.
*
* @author Paul Campbell (pcampbell@kemitix.net)
*/
class InitGitDBRepo {
private static final String INIT_MESSAGE = "Initialise GitDB v1";
private static final String INIT_USER = "GitDB";
private static final String INIT_EMAIL = "pcampbell@kemitix.net";
private static final String MASTER = "master";
private static final String IS_GIT_DB = "isGitDB";
private static final String REFS_HEADS_FORMAT = "refs/heads/%s";
/**
* Initialise a new GitDB repo.
*
* @param dbDir the directory to initialise the repo in
* @throws IOException if there is an error in creating the repo files
*/
static void create(final Path dbDir) throws IOException {
final InitGitDBRepo initRepo = new InitGitDBRepo();
final File validDbDir = initRepo.validDbDir(dbDir.toFile());
validDbDir.mkdirs();
final Repository repository = RepositoryCache.FileKey.exact(validDbDir, FS.DETECTED).open(false);
repository.create(true);
initRepo.createInitialBranchOnMaster(repository);
}
private void createInitialBranchOnMaster(final Repository repository) throws IOException {
final GitDBRepo repo = GitDBRepo.in(repository);
final ObjectId objectId = repo.insertBlob(new byte[0]);
final ObjectId treeId = repo.insertNewTree(IS_GIT_DB, objectId);
final ObjectId commitId = repo.insertCommit(treeId, INIT_MESSAGE, INIT_USER, INIT_EMAIL, ObjectId.zeroId());
createBranch(repository, commitId, MASTER);
}
private void createBranch(
final Repository repository,
final ObjectId commitId,
final String branchName
) throws IOException {
final Path branchRefPath = branchRefPath(repository, branchName);
final byte[] commitIdBytes = commitId.name().getBytes(StandardCharsets.UTF_8);
Files.write(branchRefPath, commitIdBytes);
}
private Path branchRefPath(
final Repository repository,
final String branchName
) {
return repository.getDirectory()
.toPath()
.resolve(String.format(REFS_HEADS_FORMAT, branchName))
.toAbsolutePath();
}
private File validDbDir(final File dbDir) throws IOException {
verifyIsNotAFile(dbDir);
if (dbDir.exists()) {
verifyIsEmpty(dbDir);
}
return dbDir;
}
private void verifyIsEmpty(final File dbDir) throws IOException {
if (Files.newDirectoryStream(dbDir.toPath()).iterator().hasNext()) {
throw new DirectoryNotEmptyException(dbDir.toString());
}
}
private void verifyIsNotAFile(final File dbDir) throws NotDirectoryException {
if (dbDir.isFile()) {
throw new NotDirectoryException(dbDir.toString());
}
}
}