| /******************************************************************************* |
| * Copyright (c) 2008, 2017 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.touchpoint.natives.actions; |
| |
| import java.io.*; |
| import java.util.Map; |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.equinox.internal.p2.touchpoint.natives.*; |
| import org.eclipse.equinox.p2.engine.spi.ProvisioningAction; |
| import org.eclipse.osgi.util.NLS; |
| |
| public class LinkAction extends ProvisioningAction { |
| public static final String ID = "ln"; //$NON-NLS-1$ |
| private static final boolean WINDOWS = java.io.File.separatorChar == '\\'; |
| |
| @Override |
| public IStatus execute(Map<String, Object> parameters) { |
| String targetDir = (String) parameters.get(ActionConstants.PARM_TARGET_DIR); |
| if (targetDir == null) |
| return new Status(IStatus.ERROR, Activator.ID, IStatus.OK, NLS.bind(Messages.param_not_set, ActionConstants.PARM_TARGET_DIR, ID), null); |
| |
| String linkTarget = (String) parameters.get(ActionConstants.PARM_LINK_TARGET); |
| if (linkTarget == null) |
| return new Status(IStatus.ERROR, Activator.ID, IStatus.OK, NLS.bind(Messages.param_not_set, ActionConstants.PARM_LINK_TARGET, ID), null); |
| |
| String linkName = (String) parameters.get(ActionConstants.PARM_LINK_NAME); |
| if (linkName == null) |
| return new Status(IStatus.ERROR, Activator.ID, IStatus.OK, NLS.bind(Messages.param_not_set, ActionConstants.PARM_LINK_NAME, ID), null); |
| |
| String force = (String) parameters.get(ActionConstants.PARM_LINK_FORCE); |
| |
| IBackupStore store = (IBackupStore) parameters.get(NativeTouchpoint.PARM_BACKUP); |
| |
| try { |
| ln(targetDir, linkTarget, linkName, Boolean.parseBoolean(force), store); |
| } catch (IOException e) { |
| return new Status(IStatus.ERROR, Activator.ID, IStatus.OK, NLS.bind(Messages.link_failed, linkName, ID), e); |
| } |
| return Status.OK_STATUS; |
| } |
| |
| @Override |
| public IStatus undo(Map<String, Object> parameters) { |
| if (WINDOWS) |
| return Status.OK_STATUS; |
| String targetDir = (String) parameters.get(ActionConstants.PARM_TARGET_DIR); |
| String linkName = (String) parameters.get(ActionConstants.PARM_LINK_NAME); |
| |
| if (targetDir != null && linkName != null) { |
| File linkFile = new File(targetDir, linkName); |
| linkFile.delete(); // ok since if something was overwritten - it is restored from backup |
| } |
| return Status.OK_STATUS; |
| } |
| |
| /** |
| * Creates a link to the source file linkTarget - the created link is targetDir/linkName. |
| * TODO: Only runs on systems with a "ln -s" command supported. |
| * TODO: Does not report errors if the "ln -s" fails |
| * @param targetDir the directory where the link is created |
| * @param linkTarget the source |
| * @param linkName the name of the created link |
| * @param force if overwrite of existing file should be performed. |
| * @param store an (optional - set to null) backup store to use |
| * @throws IOException if backup of existing file fails |
| */ |
| private void ln(String targetDir, String linkTarget, String linkName, boolean force, IBackupStore store) throws IOException { |
| if (WINDOWS) |
| return; |
| // backup a file that would be overwritten using "force == true" |
| if (force && store != null) { |
| File xFile = new File(targetDir, linkName); |
| if (xFile.exists()) |
| store.backup(xFile); |
| } |
| Runtime r = Runtime.getRuntime(); |
| try { |
| Process process = r.exec(new String[] {"ln", "-s" + (force ? "f" : ""), linkTarget, targetDir + IPath.SEPARATOR + linkName}); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ |
| readOffStream(process.getErrorStream()); |
| readOffStream(process.getInputStream()); |
| try { |
| process.waitFor(); |
| } catch (InterruptedException e) { |
| // mark thread interrupted and continue |
| Thread.currentThread().interrupt(); |
| } |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| |
| private void readOffStream(InputStream inputStream) { |
| try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) { |
| while (reader.readLine() != null) { |
| // do nothing |
| } |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| } |