net.oneandone.stool.setup.Control Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of main Show documentation
Stool's main component. Java Library, cli, setup code.
There is a newer version: 4.0.3
/**
 * Copyright 1&1 Internet AG, https://github.com/1and1/
 *
 * 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 net.oneandone.stool.setup;

import net.oneandone.sushi.fs.World;
import net.oneandone.sushi.fs.file.FileNode;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

/** Creates an directory with debian maintainer scripts. */
public class Control {
    public static void main(String[] args) throws IOException {
        World world;

        if (args.length != 4) {
            throw new IOException("usage: control main srcdir application dest");
        }
        world = World.create();
        run(args[0], world.file(args[1]), world.file(args[2]), world.file(args[3]));
        System.exit(0);
    }

    public static void run(String main, FileNode srcdir, FileNode application, FileNode dest) throws IOException {
        String launcherStr;
        byte[] launcher;
        byte[] orig;
        int idx;

        launcherStr = srcdir.getWorld().resource("templates/maintainer-launcher").readString();
        launcherStr = launcherStr.replace("%MAIN%", main);
        launcher = launcherStr.getBytes("UTF8");

        srcdir.checkDirectory();
        application.checkFile();
        dest.mkdir();

        orig = application.readBytes();
        idx = endOfLauncher(orig);
        srcdir.copyDirectory(dest);
        dest.join("preinst").writeBytes(launcher);
        dest.join("postinst").writeBytes(launcher);
        dest.join("prerm").writeBytes(launcher);
        try (OutputStream out = dest.join("postrm.bin").newOutputStream()) {
            out.write(launcher);
            out.write(orig, idx, orig.length - idx);
        }
    }

    private static int endOfLauncher(byte[] all) {
        try {
            return indexOf(all, "\nPK".getBytes("ascii"));
        } catch (UnsupportedEncodingException e) {
            throw new IllegalStateException();
        }
    }

    public static int indexOf(byte[] array, byte[] sub) {
        int j;

        for (int i = 0; i < array.length - sub.length; i++) {
            for (j = 0; j < sub.length; j++) {
                if (sub[j] != array[i + j]) {
                    break;
                }
            }
            if (j == sub.length) {
                return i;
            }
        }
        throw new IllegalStateException();
    }
}