DpkgDebCli.java

package org.codehaus.mojo.deb.jdpkg;

import org.codehaus.mojo.deb.jdpkg.ar.Ar;
import static org.codehaus.mojo.deb.jdpkg.ar.ArUtil.*;
import org.codehaus.mojo.deb.jdpkg.ar.CloseableIterable;
import org.codehaus.mojo.deb.jdpkg.ar.ReadableArFile;
import org.codehaus.plexus.archiver.tar.TarEntry;
import org.codehaus.plexus.archiver.tar.TarInputStream;
import org.codehaus.plexus.util.StringUtils;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import java.util.zip.GZIPInputStream;

/**
 * @author <a href="mailto:trygve.laugstol@arktekk.no">Trygve Laugstøl</a>
 * @version $Id$
 */
public class DpkgDebCli {
    private PrintWriter out;

    public DpkgDebCli(PrintWriter out) {
        this.out = out;
    }

    public void main(String[] args) throws Exception {
        String command = args[0];

        if (command.equals("-c")) {
            contents(new File(args[1]));
        }
    }

    public void contents(File debFile) throws IOException {
        CloseableIterable<ReadableArFile> reader = null;

        try {
            reader = Ar.read(debFile);
            for (ReadableArFile file : reader) {

                if (file.getName().equals("data.tar.gz")) {
                    dumpContents(file);
                    break;
                }
            }
        }
        finally {
            closeSilent(reader);
        }
    }

    private void dumpContents(ReadableArFile arFile) throws IOException {
        TarInputStream tis = null;
        try {
            tis = new TarInputStream(new GZIPInputStream(arFile.open()));

            TarEntry entry = tis.getNextEntry();
            while (entry != null) {
                print(entry);
                entry = tis.getNextEntry();
            }
        }
        finally {
            closeSilent(tis);
        }
    }

    final SimpleDateFormat dateFormat;

    {
        dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
    }

    private void print(TarEntry entry) {
        String type;

        if (!entry.getLinkName().equals("")) {
            type = "l";
        } else if (entry.isDirectory()) {
            type = "d";
        } else {
            type = "-";
        }

        String mode = mode(entry.getMode());
        String ug = entry.getUserName() + "/" + entry.getGroupName();
        String date = dateFormat.format(entry.getModTime());
        String size = StringUtils.leftPad(Long.toString(entry.getSize()), 9);
        out.print(type + mode + " " + ug + " " + size + " " + date + " " + entry.getName());

        if (type.equals("l")) {
            out.print(" -> " + entry.getLinkName());
        }
        out.println();
    }

    private String mode(int mode) {
        StringBuilder builder = new StringBuilder("         ");
        builder.setLength(9);
        builder.setCharAt(0, (mode & 0x100) > 0 ? 'r' : '-');
        builder.setCharAt(1, (mode & 0x080) > 0 ? 'w' : '-');
        builder.setCharAt(2, (mode & 0x040) > 0 ? 'x' : '-');
        builder.setCharAt(3, (mode & 0x020) > 0 ? 'r' : '-');
        builder.setCharAt(4, (mode & 0x010) > 0 ? 'w' : '-');
        builder.setCharAt(5, (mode & 0x400) > 0 ? 's' : (mode & 0x008) > 0 ? 'x' : '-');
        builder.setCharAt(6, (mode & 0x004) > 0 ? 'r' : '-');
        builder.setCharAt(7, (mode & 0x002) > 0 ? 'w' : '-');
        builder.setCharAt(8, (mode & 0x001) > 0 ? 'x' : '-');

        return builder.toString();
    }
}