Java-based Package Manager

Contributor Joined: 11 Apr 2006 Location: Ontario, Canada

For my Computer Info Sci culminating project I wrote up a small package manager for "installing" iPL via the loop-mount method. It basically just installs Loader 2 via ipodpatcher and extracts archives to your iPod. Due to its rushed nature (i.e. project to be handed in on Monday) it is far from complete and I won't even bother listing what else needs to be done/added.

For testing purposes, it downloads a packlist from here and installs a minimal ZeroSlackr system (a very old version with outdated components but works for demo purposes). At this stage it doesn't even differentiate between a kernel archive and a pack archive. All it does is call ipodpatcher and extract files. Really just a bunch of code slapped together for now.

The package managing part of the program I can fix and improve. The only real problem I have is iPod detection. Since I only need to demonstrate that the program roughly works on Windows and doesn't need to be perfect (for the culminating project at least), my iPod detection code is just a loop through all the drives looking for the "iPod_Control" folder. I've looked at both the ipodpatcher and Installer 2 code but my limited knowledge in both Java-hardware communication and iPod hardware in general prevents me from really doing much else. Any help in this area would be greatly appreciated.

So here is the incomplete prototype. The archive is just the Eclipse project 7-zip'd with compiled jar files in the "export" folder. It is also just command-line for now (i.e. run it with "java -jar zeroslackr-lazy-installer-cmd.jar [OPTIONS]" through a command-line) as I am not too familiar with GUI in Java (though I can always just use one of those cheap GUI builders like Jigloo). Again this is just a rushed-but-semi-works version that needs a lot of fixing/cleaning up. It is not for practical use yet but just "Software Development" (i.e. looking at the source code for help/suggestions). Nevertheless, any feedback will be appreciated.

http://www.mediafire.com/download.php?ftcywwiieom

~Keripo

Contributor Joined: 11 Apr 2006 Location: Ontario, Canada

New iPod detection code. Unable to test it under a system other than Windows though (if you can compile for Linux or Mac and can test it, please do and post the result). In the end I still have to rely on the "iPod_Control" folder since all Java USB implementations are pretty much incomplete other than for Linux (i.e. javax.usb and jusb are too much in their alpha stages).

Here's the Java code

Code:

/**
* For testing - please reply with your results, thanks!
*/
public static void main(String[] args) {
 System.out.println(getHostOS());
 System.out.println(getiPodPath());
}

/**
* Convert processed path to native equivalent.
* @param path Path to be converted using '/' as place-holders.
* @return Converted path.
*/
public static String convertPath(String path) {
 return path.replace('/', File.separatorChar);
} // convertPath

/**
* Get host OS.
* @return
* -1 if Unsupported 
* 1 if Windows 
* 2 if Mac OS X 
* 3 if Linux 
*/
public static int getHostOS() {
 String os = System.getProperty("os.name");
 if (os.indexOf("Windows") != -1) {
 return 1;
 } else if (os.indexOf("Mac OS X") != -1) {
 return 2;
 } else if (os.indexOf("Linux") != -1) {
 return 3;
 } else {
 return -1;
 }
} // getHostOS

/**
* Get path to iPod.
* Precondition: iPod is mounted normally
* (i.e. as a removable drive for Windows,
* in "/Volumes/" for Mac OS X,
* or in "/mnt/" for Linux)
* @return Path to iPod's root, null if not found.
*/
public static String getiPodPath() {
 String checkDir = "iPod_Control";
 File[] roots = null;
 switch (getHostOS()) {
 case -1: // Unsupported host
 break;
 case 1: // Windows
 roots = File.listRoots();
 break;
 case 2: // Mac OS X
 roots = new File(convertPath("/Volumes/")).listFiles();
 break;
 case 3: // Linux
 roots = new File(convertPath("/mnt/")).listFiles();
 break;
 }
 if (roots != null) {
 for (File f: roots) {
 String path = f.getAbsolutePath();
 if (new File(path + checkDir).exists()
 || new File(path + File.pathSeparator + checkDir).exists() ) { // FIXME - does this work for Mac and Linux???
 return path;
 }
 }
 }
 return null;
}

Moderator Joined: 28 Apr 2005 Location: Australia

I made a few changes, and it now works correctly on Linux.

Code:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

/**
*
* @author rufus
*/
public class Main {
/**
* For testing - please reply with your results, thanks!
*/
public static void main(String[] args) {
System.out.println(getHostOS());
System.out.println(getiPodPath());
}

/**
* Convert processed path to native equivalent.
* @param path Path to be converted using '/' as place-holders.
* @return Converted path.
*/
public static String convertPath(String path) {
return path.replace('/', File.separatorChar);
} // convertPath

/**
* Get host OS.
* @return
* -1 if Unsupported 
* 1 if Windows 
* 2 if Mac OS X 
* 3 if Linux 
*/
public static int getHostOS() {
String os = System.getProperty("os.name");
if (os.indexOf("Windows") != -1) {
return 1;
} else if (os.indexOf("Mac OS X") != -1) {
return 2;
} else if (os.indexOf("Linux") != -1) {
return 3;
} else {
return -1;
}
} // getHostOS

/**
* Get path to iPod.
* Precondition: iPod is mounted normally
* (i.e. as a removable drive for Windows,
* in "/Volumes/" for Mac OS X,
* or in "/mnt/" for Linux)
* @return Path to iPod's root, null if not found.
*/
public static String getiPodPath() {
String checkDir = "iPod_Control";
File[] roots = null;
switch (getHostOS()) {
case -1: // Unsupported host
break;
case 1: // Windows
roots = File.listRoots();
break;
case 2: // Mac OS X
roots = new File(convertPath("/Volumes/")).listFiles();
break;
case 3: // Linux

try {
BufferedReader reader = new BufferedReader(new FileReader("/proc/mounts"));
ArrayList<String> list = new ArrayList();
for(;;) {
String line = reader.readLine();
if(line == null) break;
int ispace = line.indexOf(' ');
list.add(line.substring(ispace+1, line.indexOf(' ', ispace+1)));
}
reader.close();
roots = new File[list.size()];
for(int i=0; i<list.size(); i++)
roots[i] = new File(list.get(i));
} catch (IOException ex) {
File[] mnt = new File("/mnt/").listFiles();
File[] media = new File("/media/").listFiles();
roots = new File[mnt.length + media.length];
System.arraycopy(mnt, 0, roots, 0, mnt.length);
System.arraycopy(media, 0, roots, mnt.length, media.length);
}
}
if (roots != null) {
for (File f: roots) {
String path = f.getAbsolutePath();
if (new File(path + checkDir).exists()
|| new File(path + File.separator + checkDir).exists() ) { // FIXME - does this work for Mac and Linux???
return path;
}
}
}
return null;
}

}

Edit:

Oh, and the output is:
3
/media/IPOD

Edit 2:

Whoops, fixed some obviously broken fall-back code if the procfs is not mounted at /proc or is unavailable.

Contributor Joined: 11 Apr 2006 Location: Ontario, Canada

Thanks mucho Rufus. I played around with your code and re-did using /proc/mounts (never knew it existed before). I prefer Scanner over BufferedReader as thats what I'm more use to. I also didn't realize I used pathSeparatorChar instead of separatorChar (whoops). I also had to change how checking/returning is done since Windows returns it with the unwanted extra "\" (all my extract methods start with a separatorChar).

Code:

/**
* Get path to iPod.
* Precondition: iPod is mounted
* (i.e. as a removable drive for Windows,
* in "/Volumes/" for Mac OS X,
* or in somewhere for Linux)
* @return Path to iPod's root, null if not found.
*/
public static String getiPodPath() {

 final String CHECK_DIR = "iPod_Control";
 File[] roots;

 switch (getHostOS()) {
 case -1: // Unsupported host
 break;
 case 1: // Windows
 roots = File.listRoots();
 for (File f: roots) {
 String path = f.getAbsolutePath();
 if (new File(path + CHECK_DIR).exists()) {
 // Need to remove the ending "\"
 return path.substring(0, path.length()-1);
 }
 }
 break;
 case 2: // Mac OS X
 roots = new File(Tools.convertPath("/Volumes/")).listFiles();
 for (File f: roots) {
 String path = f.getAbsolutePath();
 if (new File(path + File.separatorChar + CHECK_DIR).exists()) {
 return path;
 }
 }
 break;
 case 3: // Linux - Thanks mucho to Rufus!
 try {
 Scanner proc = new Scanner(new File("/proc/mounts"));
 String procLine;
 ArrayList<File> mounts = new ArrayList<File>();
 while (proc.hasNextLine()) {
 procLine = proc.nextLine();
 int i = procLine.indexOf(' ') + 1;
 mounts.add(new File(procLine.substring(i, procLine.indexOf(' ', i))));
 }
 proc.close();
 roots = new File[mounts.size()];
 roots = mounts.toArray(roots);
 } catch (IOException e) {
 File[] mnt = new File("/mnt/").listFiles();
 File[] media = new File("/media/").listFiles();
 roots = new File[mnt.length + media.length];
 System.arraycopy(mnt, 0, roots, 0, mnt.length);
 System.arraycopy(media, 0, roots, mnt.length, media.length);
 }
 for (File f: roots) {
 String path = f.getAbsolutePath();
 if (new File(path + File.separatorChar + CHECK_DIR).exists()) {
 return path;
 }
 }
 break;
 } //switch
 return null;

} // getiPodPath

Tested it on Slax and it worked fine (returned "/mnt/sda2_removable"). I can't test it on Mac but, assuming that the iPod always gets mounted to /Volumes/, it should work fine.

Moderator Joined: 28 Apr 2005 Location: Australia

No worries, also, on Linux, and presumably other UNIXes, redundant separators are ignored, so a path like //media////disk/// is equivalent to /media/disk/, not sure about Windows though.

Oh, and OSX may well have an equivalent to /proc, I'll have a look next time I'm near a Mac.