| // 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.googlesource.gerrit.plugins.replication; |
| |
| import com.google.inject.Inject; |
| import com.google.inject.Provider; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import org.eclipse.jgit.errors.TransportException; |
| import org.eclipse.jgit.transport.RemoteSession; |
| import org.eclipse.jgit.transport.SshSessionFactory; |
| import org.eclipse.jgit.transport.URIish; |
| import org.eclipse.jgit.util.FS; |
| import org.eclipse.jgit.util.io.StreamCopyThread; |
| |
| /** Utility class that provides SSH access to remote URIs. */ |
| public class SshHelper { |
| private final Provider<SshSessionFactory> sshSessionFactoryProvider; |
| private final int commandTimeout; |
| private final int connectionTimeout; |
| |
| @Inject |
| protected SshHelper( |
| ReplicationConfig replicationConfig, Provider<SshSessionFactory> sshSessionFactoryProvider) { |
| this.sshSessionFactoryProvider = sshSessionFactoryProvider; |
| this.commandTimeout = replicationConfig.getSshCommandTimeout(); |
| this.connectionTimeout = replicationConfig.getSshConnectionTimeout(); |
| } |
| |
| public int executeRemoteSsh(URIish uri, String cmd, OutputStream errStream) throws IOException { |
| RemoteSession ssh = connect(uri); |
| Process proc = ssh.exec(cmd, commandTimeout); |
| proc.getOutputStream().close(); |
| StreamCopyThread out = new StreamCopyThread(proc.getInputStream(), errStream); |
| StreamCopyThread err = new StreamCopyThread(proc.getErrorStream(), errStream); |
| out.start(); |
| err.start(); |
| try { |
| proc.waitFor(); |
| out.halt(); |
| err.halt(); |
| } catch (InterruptedException interrupted) { |
| // Don't wait, drop out immediately. |
| } |
| ssh.disconnect(); |
| return proc.exitValue(); |
| } |
| |
| public OutputStream newErrorBufferStream() { |
| return new OutputStream() { |
| private final StringBuilder out = new StringBuilder(); |
| private final StringBuilder line = new StringBuilder(); |
| |
| @Override |
| public synchronized String toString() { |
| while (out.length() > 0 && out.charAt(out.length() - 1) == '\n') { |
| out.setLength(out.length() - 1); |
| } |
| return out.toString(); |
| } |
| |
| @Override |
| public synchronized void write(int b) { |
| if (b == '\r') { |
| return; |
| } |
| |
| line.append((char) b); |
| |
| if (b == '\n') { |
| out.append(line); |
| line.setLength(0); |
| } |
| } |
| }; |
| } |
| |
| protected RemoteSession connect(URIish uri) throws TransportException { |
| return sshSessionFactoryProvider.get().getSession(uri, null, FS.DETECTED, connectionTimeout); |
| } |
| } |