org.codehaus.mojo.unix.deb.DpkgDebTool.java Source code

Introduction

Here is the source code for org.codehaus.mojo.unix.deb.DpkgDebTool.java

Source

package org.codehaus.mojo.unix.deb;

/*
 * The MIT License
 *
 * Copyright 2009 The Codehaus.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import fj.data.*;
import static fj.data.Option.*;
import org.apache.commons.compress.archivers.tar.*;
import org.codehaus.mojo.unix.*;
import static org.codehaus.mojo.unix.UnixFsObject.*;
import org.codehaus.mojo.unix.ar.*;
import org.codehaus.mojo.unix.util.*;
import static org.codehaus.mojo.unix.util.RelativePath.*;
import org.joda.time.*;

import java.io.*;
import java.util.*;
import java.util.List;
import java.util.zip.*;

/**
 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
 */
public class DpkgDebTool {
    public static List<UnixFsObject> contents(File file) throws IOException {
        ArReader archive = null;
        try {
            archive = Ar.read(file);

            for (ReadableArFile arFile : archive) {
                if (arFile.getName().startsWith("data.")) {
                    return processCompressedTar(arFile);
                }
            }

            throw new IOException("Could not find data file in: " + file.getAbsolutePath());
        } finally {
            ArUtil.close(archive);
        }
    }

    private static List<UnixFsObject> processCompressedTar(ReadableArFile arFile) throws IOException {
        if (arFile.getName().endsWith(".tar.gz")) {
            // Don't worry about closing the stream, that will be taken care of by the iterator.

            return process(new GZIPInputStream(arFile.open(), 1024 * 128));
        } else {
            throw new IOException("Unsupported compression format of data tar file: " + arFile.getName());
        }
    }

    private static List<UnixFsObject> process(InputStream is) throws IOException {
        TarArchiveInputStream tarInputStream = new TarArchiveInputStream(is);

        List<UnixFsObject> objects = new ArrayList<UnixFsObject>();

        TarArchiveEntry entry = (TarArchiveEntry) tarInputStream.getNextEntry();

        while (entry != null) {
            Option<UnixFileMode> mode = some(UnixFileMode.fromInt(entry.getMode()));
            FileAttributes attributes = new FileAttributes(some(entry.getUserName()), some(entry.getGroupName()),
                    mode);
            RelativePath path = relativePath(entry.getName());
            LocalDateTime lastModified = LocalDateTime.fromDateFields(entry.getModTime());

            UnixFsObject object;

            if (entry.isDirectory()) {
                object = directory(path, lastModified, attributes);
            } else if (entry.isSymbolicLink()) {
                object = symlink(path, lastModified, some(entry.getUserName()), some(entry.getGroupName()),
                        entry.getLinkName());
            } else if (entry.isFile()) {
                object = regularFile(path, lastModified, entry.getSize(), attributes);
            } else {
                throw new IOException("Unsupported link type: name=" + entry.getName());
            }

            objects.add(object);

            entry = (TarArchiveEntry) tarInputStream.getNextEntry();
        }

        return objects;
    }
}