TransportSftp.java
- /*
- * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> 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.transport;
- import static org.eclipse.jgit.lib.Constants.INFO_ALTERNATES;
- import static org.eclipse.jgit.lib.Constants.LOCK_SUFFIX;
- import static org.eclipse.jgit.lib.Constants.OBJECTS;
- import java.io.BufferedReader;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.io.OutputStream;
- import java.text.MessageFormat;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.EnumSet;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import java.util.Set;
- import java.util.TreeMap;
- import java.util.concurrent.TimeUnit;
- import java.util.stream.Collectors;
- import org.eclipse.jgit.errors.NotSupportedException;
- import org.eclipse.jgit.errors.TransportException;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ObjectIdRef;
- import org.eclipse.jgit.lib.ProgressMonitor;
- import org.eclipse.jgit.lib.Ref;
- import org.eclipse.jgit.lib.Ref.Storage;
- import org.eclipse.jgit.lib.Repository;
- import org.eclipse.jgit.lib.SymbolicRef;
- /**
- * Transport over the non-Git aware SFTP (SSH based FTP) protocol.
- * <p>
- * The SFTP transport does not require any specialized Git support on the remote
- * (server side) repository. Object files are retrieved directly through secure
- * shell's FTP protocol, making it possible to copy objects from a remote
- * repository that is available over SSH, but whose remote host does not have
- * Git installed.
- * <p>
- * Unlike the HTTP variant (see
- * {@link org.eclipse.jgit.transport.TransportHttp}) we rely upon being able to
- * list files in directories, as the SFTP protocol supports this function. By
- * listing files through SFTP we can avoid needing to have current
- * <code>objects/info/packs</code> or <code>info/refs</code> files on the remote
- * repository and access the data directly, much as Git itself would.
- * <p>
- * Concurrent pushing over this transport is not supported. Multiple concurrent
- * push operations may cause confusion in the repository state.
- *
- * @see WalkFetchConnection
- */
- public class TransportSftp extends SshTransport implements WalkTransport {
- static final TransportProtocol PROTO_SFTP = new TransportProtocol() {
- @Override
- public String getName() {
- return JGitText.get().transportProtoSFTP;
- }
- @Override
- public Set<String> getSchemes() {
- return Collections.singleton("sftp"); //$NON-NLS-1$
- }
- @Override
- public Set<URIishField> getRequiredFields() {
- return Collections.unmodifiableSet(EnumSet.of(URIishField.HOST,
- URIishField.PATH));
- }
- @Override
- public Set<URIishField> getOptionalFields() {
- return Collections.unmodifiableSet(EnumSet.of(URIishField.USER,
- URIishField.PASS, URIishField.PORT));
- }
- @Override
- public int getDefaultPort() {
- return 22;
- }
- @Override
- public Transport open(URIish uri, Repository local, String remoteName)
- throws NotSupportedException {
- return new TransportSftp(local, uri);
- }
- };
- TransportSftp(Repository local, URIish uri) {
- super(local, uri);
- }
- /** {@inheritDoc} */
- @Override
- public FetchConnection openFetch() throws TransportException {
- final SftpObjectDB c = new SftpObjectDB(uri.getPath());
- final WalkFetchConnection r = new WalkFetchConnection(this, c);
- r.available(c.readAdvertisedRefs());
- return r;
- }
- /** {@inheritDoc} */
- @Override
- public PushConnection openPush() throws TransportException {
- final SftpObjectDB c = new SftpObjectDB(uri.getPath());
- final WalkPushConnection r = new WalkPushConnection(this, c);
- r.available(c.readAdvertisedRefs());
- return r;
- }
- FtpChannel newSftp() throws IOException {
- FtpChannel channel = getSession().getFtpChannel();
- channel.connect(getTimeout(), TimeUnit.SECONDS);
- return channel;
- }
- class SftpObjectDB extends WalkRemoteObjectDatabase {
- private final String objectsPath;
- private FtpChannel ftp;
- SftpObjectDB(String path) throws TransportException {
- if (path.startsWith("/~")) //$NON-NLS-1$
- path = path.substring(1);
- if (path.startsWith("~/")) //$NON-NLS-1$
- path = path.substring(2);
- try {
- ftp = newSftp();
- ftp.cd(path);
- ftp.cd(OBJECTS);
- objectsPath = ftp.pwd();
- } catch (FtpChannel.FtpException f) {
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotEnterObjectsPath, path,
- f.getMessage()), f);
- } catch (IOException ioe) {
- close();
- throw new TransportException(uri, ioe.getMessage(), ioe);
- }
- }
- SftpObjectDB(SftpObjectDB parent, String p)
- throws TransportException {
- try {
- ftp = newSftp();
- ftp.cd(parent.objectsPath);
- ftp.cd(p);
- objectsPath = ftp.pwd();
- } catch (FtpChannel.FtpException f) {
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotEnterPathFromParent, p,
- parent.objectsPath, f.getMessage()), f);
- } catch (IOException ioe) {
- close();
- throw new TransportException(uri, ioe.getMessage(), ioe);
- }
- }
- @Override
- URIish getURI() {
- return uri.setPath(objectsPath);
- }
- @Override
- Collection<WalkRemoteObjectDatabase> getAlternates() throws IOException {
- try {
- return readAlternates(INFO_ALTERNATES);
- } catch (FileNotFoundException err) {
- return null;
- }
- }
- @Override
- WalkRemoteObjectDatabase openAlternate(String location)
- throws IOException {
- return new SftpObjectDB(this, location);
- }
- @Override
- Collection<String> getPackNames() throws IOException {
- final List<String> packs = new ArrayList<>();
- try {
- Collection<FtpChannel.DirEntry> list = ftp.ls("pack"); //$NON-NLS-1$
- Set<String> files = list.stream()
- .map(FtpChannel.DirEntry::getFilename)
- .collect(Collectors.toSet());
- HashMap<String, Long> mtimes = new HashMap<>();
- for (FtpChannel.DirEntry ent : list) {
- String n = ent.getFilename();
- if (!n.startsWith("pack-") || !n.endsWith(".pack")) { //$NON-NLS-1$ //$NON-NLS-2$
- continue;
- }
- String in = n.substring(0, n.length() - 5) + ".idx"; //$NON-NLS-1$
- if (!files.contains(in)) {
- continue;
- }
- mtimes.put(n, Long.valueOf(ent.getModifiedTime()));
- packs.add(n);
- }
- Collections.sort(packs,
- (o1, o2) -> mtimes.get(o2).compareTo(mtimes.get(o1)));
- } catch (FtpChannel.FtpException f) {
- throw new TransportException(
- MessageFormat.format(JGitText.get().cannotListPackPath,
- objectsPath, f.getMessage()),
- f);
- }
- return packs;
- }
- @Override
- FileStream open(String path) throws IOException {
- try {
- return new FileStream(ftp.get(path));
- } catch (FtpChannel.FtpException f) {
- if (f.getStatus() == FtpChannel.FtpException.NO_SUCH_FILE) {
- throw new FileNotFoundException(path);
- }
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotGetObjectsPath, objectsPath, path,
- f.getMessage()), f);
- }
- }
- @Override
- void deleteFile(String path) throws IOException {
- try {
- ftp.delete(path);
- } catch (FtpChannel.FtpException f) {
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotDeleteObjectsPath, objectsPath,
- path, f.getMessage()), f);
- }
- // Prune any now empty directories.
- //
- String dir = path;
- int s = dir.lastIndexOf('/');
- while (s > 0) {
- try {
- dir = dir.substring(0, s);
- ftp.rmdir(dir);
- s = dir.lastIndexOf('/');
- } catch (IOException je) {
- // If we cannot delete it, leave it alone. It may have
- // entries still in it, or maybe we lack write access on
- // the parent. Either way it isn't a fatal error.
- //
- break;
- }
- }
- }
- @Override
- OutputStream writeFile(String path, ProgressMonitor monitor,
- String monitorTask) throws IOException {
- Throwable err = null;
- try {
- return ftp.put(path);
- } catch (FileNotFoundException e) {
- mkdir_p(path);
- } catch (FtpChannel.FtpException je) {
- if (je.getStatus() == FtpChannel.FtpException.NO_SUCH_FILE) {
- mkdir_p(path);
- } else {
- err = je;
- }
- }
- if (err == null) {
- try {
- return ftp.put(path);
- } catch (IOException e) {
- err = e;
- }
- }
- throw new TransportException(
- MessageFormat.format(JGitText.get().cannotWriteObjectsPath,
- objectsPath, path, err.getMessage()),
- err);
- }
- @Override
- void writeFile(String path, byte[] data) throws IOException {
- final String lock = path + LOCK_SUFFIX;
- try {
- super.writeFile(lock, data);
- try {
- ftp.rename(lock, path);
- } catch (IOException e) {
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotWriteObjectsPath, objectsPath,
- path, e.getMessage()), e);
- }
- } catch (IOException err) {
- try {
- ftp.rm(lock);
- } catch (IOException e) {
- // Ignore deletion failure, we are already
- // failing anyway.
- }
- throw err;
- }
- }
- private void mkdir_p(String path) throws IOException {
- final int s = path.lastIndexOf('/');
- if (s <= 0)
- return;
- path = path.substring(0, s);
- Throwable err = null;
- try {
- ftp.mkdir(path);
- return;
- } catch (FileNotFoundException f) {
- mkdir_p(path);
- } catch (FtpChannel.FtpException je) {
- if (je.getStatus() == FtpChannel.FtpException.NO_SUCH_FILE) {
- mkdir_p(path);
- } else {
- err = je;
- }
- }
- if (err == null) {
- try {
- ftp.mkdir(path);
- return;
- } catch (IOException e) {
- err = e;
- }
- }
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotMkdirObjectPath, objectsPath, path,
- err.getMessage()), err);
- }
- Map<String, Ref> readAdvertisedRefs() throws TransportException {
- final TreeMap<String, Ref> avail = new TreeMap<>();
- readPackedRefs(avail);
- readRef(avail, ROOT_DIR + Constants.HEAD, Constants.HEAD);
- readLooseRefs(avail, ROOT_DIR + "refs", "refs/"); //$NON-NLS-1$ //$NON-NLS-2$
- return avail;
- }
- private void readLooseRefs(TreeMap<String, Ref> avail, String dir,
- String prefix) throws TransportException {
- final Collection<FtpChannel.DirEntry> list;
- try {
- list = ftp.ls(dir);
- } catch (IOException e) {
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotListObjectsPath, objectsPath, dir,
- e.getMessage()), e);
- }
- for (FtpChannel.DirEntry ent : list) {
- String n = ent.getFilename();
- if (".".equals(n) || "..".equals(n)) //$NON-NLS-1$ //$NON-NLS-2$
- continue;
- String nPath = dir + "/" + n; //$NON-NLS-1$
- if (ent.isDirectory()) {
- readLooseRefs(avail, nPath, prefix + n + "/"); //$NON-NLS-1$
- } else {
- readRef(avail, nPath, prefix + n);
- }
- }
- }
- private Ref readRef(TreeMap<String, Ref> avail, String path,
- String name) throws TransportException {
- final String line;
- try (BufferedReader br = openReader(path)) {
- line = br.readLine();
- } catch (FileNotFoundException noRef) {
- return null;
- } catch (IOException err) {
- throw new TransportException(MessageFormat.format(
- JGitText.get().cannotReadObjectsPath, objectsPath, path,
- err.getMessage()), err);
- }
- if (line == null) {
- throw new TransportException(
- MessageFormat.format(JGitText.get().emptyRef, name));
- }
- if (line.startsWith("ref: ")) { //$NON-NLS-1$
- final String target = line.substring("ref: ".length()); //$NON-NLS-1$
- Ref r = avail.get(target);
- if (r == null)
- r = readRef(avail, ROOT_DIR + target, target);
- if (r == null)
- r = new ObjectIdRef.Unpeeled(Ref.Storage.NEW, target, null);
- r = new SymbolicRef(name, r);
- avail.put(r.getName(), r);
- return r;
- }
- if (ObjectId.isId(line)) {
- final Ref r = new ObjectIdRef.Unpeeled(loose(avail.get(name)),
- name, ObjectId.fromString(line));
- avail.put(r.getName(), r);
- return r;
- }
- throw new TransportException(
- MessageFormat.format(JGitText.get().badRef, name, line));
- }
- private Storage loose(Ref r) {
- if (r != null && r.getStorage() == Storage.PACKED) {
- return Storage.LOOSE_PACKED;
- }
- return Storage.LOOSE;
- }
- @Override
- void close() {
- if (ftp != null) {
- try {
- if (ftp.isConnected()) {
- ftp.disconnect();
- }
- } finally {
- ftp = null;
- }
- }
- }
- }
- }