| /* |
| * Copyright (C) 2016, Christian Halstrick <christian.halstrick@sap.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| package org.eclipse.jgit.lfs; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.StandardCopyOption; |
| |
| import org.eclipse.jgit.attributes.FilterCommand; |
| import org.eclipse.jgit.attributes.FilterCommandFactory; |
| import org.eclipse.jgit.attributes.FilterCommandRegistry; |
| import org.eclipse.jgit.lfs.errors.CorruptMediaFile; |
| import org.eclipse.jgit.lfs.internal.AtomicObjectOutputStream; |
| import org.eclipse.jgit.lfs.lib.AnyLongObjectId; |
| import org.eclipse.jgit.lfs.lib.Constants; |
| import org.eclipse.jgit.lib.Repository; |
| import org.eclipse.jgit.util.FileUtils; |
| |
| /** |
| * Built-in LFS clean filter |
| * |
| * When new content is about to be added to the git repository and this filter |
| * is configured for that content, then this filter will replace the original |
| * content with content of a so-called LFS pointer file. The pointer file |
| * content will then be added to the git repository. Additionally this filter |
| * writes the original content in a so-called 'media file' to '.git/lfs/objects/ |
| * <first-two-characters-of-contentid>/<rest-of-contentid>' |
| * |
| * @see <a href="https://github.com/github/git-lfs/blob/master/docs/spec.md">Git |
| * LFS Specification</a> |
| * @since 4.6 |
| */ |
| public class CleanFilter extends FilterCommand { |
| /** |
| * The factory is responsible for creating instances of |
| * {@link org.eclipse.jgit.lfs.CleanFilter} |
| */ |
| public final static FilterCommandFactory FACTORY = CleanFilter::new; |
| |
| /** |
| * Registers this filter by calling |
| * {@link FilterCommandRegistry#register(String, FilterCommandFactory)} |
| */ |
| static void register() { |
| FilterCommandRegistry |
| .register(org.eclipse.jgit.lib.Constants.BUILTIN_FILTER_PREFIX |
| + Constants.ATTR_FILTER_DRIVER_PREFIX |
| + org.eclipse.jgit.lib.Constants.ATTR_FILTER_TYPE_CLEAN, |
| FACTORY); |
| } |
| |
| // Used to compute the hash for the original content |
| private AtomicObjectOutputStream aOut; |
| |
| private Lfs lfsUtil; |
| |
| // the size of the original content |
| private long size; |
| |
| // a temporary file into which the original content is written. When no |
| // errors occur this file will be renamed to the mediafile |
| private Path tmpFile; |
| |
| /** |
| * Constructor for CleanFilter. |
| * |
| * @param db |
| * the repository |
| * @param in |
| * an {@link java.io.InputStream} providing the original content |
| * @param out |
| * the {@link java.io.OutputStream} into which the content of the |
| * pointer file should be written. That's the content which will |
| * be added to the git repository |
| * @throws java.io.IOException |
| * when the creation of the temporary file fails or when no |
| * {@link java.io.OutputStream} for this file can be created |
| */ |
| public CleanFilter(Repository db, InputStream in, OutputStream out) |
| throws IOException { |
| super(in, out); |
| lfsUtil = new Lfs(db); |
| Files.createDirectories(lfsUtil.getLfsTmpDir()); |
| tmpFile = lfsUtil.createTmpFile(); |
| this.aOut = new AtomicObjectOutputStream(tmpFile.toAbsolutePath()); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int run() throws IOException { |
| try { |
| byte[] buf = new byte[8192]; |
| int length = in.read(buf); |
| if (length != -1) { |
| aOut.write(buf, 0, length); |
| size += length; |
| return length; |
| } |
| aOut.close(); |
| AnyLongObjectId loid = aOut.getId(); |
| aOut = null; |
| Path mediaFile = lfsUtil.getMediaFile(loid); |
| if (Files.isRegularFile(mediaFile)) { |
| long fsSize = Files.size(mediaFile); |
| if (fsSize != size) { |
| throw new CorruptMediaFile(mediaFile, size, fsSize); |
| } |
| FileUtils.delete(tmpFile.toFile()); |
| } else { |
| Path parent = mediaFile.getParent(); |
| if (parent != null) { |
| FileUtils.mkdirs(parent.toFile(), true); |
| } |
| FileUtils.rename(tmpFile.toFile(), mediaFile.toFile(), |
| StandardCopyOption.ATOMIC_MOVE); |
| } |
| LfsPointer lfsPointer = new LfsPointer(loid, size); |
| lfsPointer.encode(out); |
| in.close(); |
| out.close(); |
| return -1; |
| } catch (IOException e) { |
| if (aOut != null) { |
| aOut.abort(); |
| } |
| in.close(); |
| out.close(); |
| throw e; |
| } |
| } |
| } |