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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.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;
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);
}
}
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