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/*******************************************************************************
* Copyright (c) 2015, 2016 Red Hat.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Red Hat - Initial Contribution
*******************************************************************************/
package org.eclipse.linuxtools.internal.docker.core;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.linuxtools.docker.core.Activator;
import org.eclipse.linuxtools.docker.core.Messages;
import org.eclipse.osgi.util.NLS;
/**
* Utility class to discover Docker machines using the 'docker-machine' command
* line in a process.
*/
public class DockerMachine {
private static Object lock = new Object();
/**
* @param pathToDockerMachine
* the path to 'docker-machine' stored in the preferences
* @return the names of the existing Docker Machines
*/
public static String[] getNames(final String pathToDockerMachine) {
return execute(pathToDockerMachine, new String[] { "ls", "-q" }); //$NON-NLS-1$ //$NON-NLS-2$
}
/**
* @param name
* the name of the Docker Machine to inspect
* @param dockerMachineInstallDir
* the installation directory for Docker Machine
* @param vmDriverInstallDir
* the installation directory for the underlying VM driver used
* by Docker Machine
* @return the host URI to use to connect to it
*/
public static String getHost(final String name,
final String dockerMachineInstallDir,
final String vmDriverInstallDir) {
final String[] res = execute(dockerMachineInstallDir,
new String[] { "url", name }, //$NON-NLS-1$
vmDriverInstallDir);
return res.length == 1 ? res[0] : null;
}
/**
* @param name
* the name of the Docker Machine to inspect
* @param pathToDockerMachine
* the path to 'docker-machine' stored in the preferences
* @param vmDriverInstallDir
* the installation directory for the underlying VM driver used
* by Docker Machine
* @return the path to the directory containing the certificates
*/
public static String getCertPath(final String name,
final String pathToDockerMachine, final String vmDriverInstallDir) {
final String[] envVariables = execute(pathToDockerMachine,
new String[] { "env", name }, //$NON-NLS-1$
vmDriverInstallDir);
for (String envVariable : envVariables) {
if (envVariable.contains("DOCKER_CERT_PATH")) { //$NON-NLS-1$
// DOCKER_CERT_PATH="/path/to/cert-folder"
return envVariable.split("=")[1].replace("\"", ""); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
}
return null;
}
/**
* Executes the command given in parameter
*
* @param args
* command arguments
* @return the lines read in the {@link Process}' {@link InputStream} or an
* empty array if the {@code docker-machine} command could not be
* found in the {@code PATH}.
*/
private static String[] execute(final String dockerMachineInstallDir,
final String[] args, final String... extraPaths) {
synchronized (lock) {
// check that the 'docker-machine' can be found in the given
// 'dockerMachineInstallDir'
final boolean dockerMachineCommandExists = checkPathToDockerMachine(
dockerMachineInstallDir);
if (!dockerMachineCommandExists) {
// log a warning and exit
Activator.log(new Status(IStatus.WARNING, Activator.PLUGIN_ID,
NLS.bind(Messages.Docker_Machine_Command_Not_Found,
dockerMachineInstallDir)));
return new String[0];
}
final String[] command = new String[args.length + 1];
command[0] = Paths.get(dockerMachineInstallDir,
getDockerMachineExecutableName()).toString();
System.arraycopy(args, 0, command, 1, args.length);
try {
final ProcessBuilder processBuilder = new ProcessBuilder(
command);
final Map<String, String> environment = processBuilder
.environment();
final StringBuilder path = new StringBuilder();
for (String extraPath : extraPaths) {
path.append(File.pathSeparator).append(extraPath);
}
final String newEnvPath = environment.get("PATH") //$NON-NLS-1$
+ path.toString();
environment.put("PATH", newEnvPath); //$NON-NLS-1$
final Process p = processBuilder.start();
p.waitFor();
if (p.exitValue() == 0) {
final List<String> result = new ArrayList<>();
try (final InputStream inputStream = p.getInputStream();
final BufferedReader buff = new BufferedReader(
new InputStreamReader(inputStream))) {
String line;
while ((line = buff.readLine()) != null) {
result.add(line);
}
}
return result.toArray(new String[0]);
} else {
final StringBuffer errorMessage = new StringBuffer();
try (final InputStream errorStream = p.getErrorStream();
final BufferedReader buff = new BufferedReader(
new InputStreamReader(errorStream))) {
String line;
while ((line = buff.readLine()) != null) {
errorMessage.append(line).append('\n'); // $NON-NLS-1$
}
}
Activator.log(new Status(IStatus.WARNING,
Activator.PLUGIN_ID,
NLS.bind(Messages.Docker_Machine_Process_Error,
new Object[] {
Stream.of(command).collect(
Collectors.joining(" ")),
p.exitValue(),
errorMessage.toString() })));
}
} catch (IOException | InterruptedException e) {
Activator.log(new Status(IStatus.ERROR, Activator.PLUGIN_ID,
NLS.bind(Messages.Docker_Machine_Process_Exception,
Stream.of(command)
.collect(Collectors.joining(" ")),
e)));
}
return new String[0];
}
}
/**
* Checks that the 'docker-machine' command exists in the given {@code path}
*
* @param path
* to path to use to look for the 'docker-machine' command
* @return <code>true</code> if the command was found, <code>false</code>
* otherwise.
*/
public static boolean checkPathToDockerMachine(final String path) {
for (String pathFragment : path.split(File.pathSeparator)) {
final File pathToDockerMachine = new File(pathFragment,
getDockerMachineExecutableName());
if (pathToDockerMachine.exists()) {
return true;
}
}
return false;
}
/**
* @return the name of the Docker Machine executable, depending on the
* current operating system.
*/
private static String getDockerMachineExecutableName() {
if (SystemUtils.isWindows()) {
return "docker-machine.exe"; //$NON-NLS-1$
}
return "docker-machine"; //$NON-NLS-1$
}
}
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