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// Example showing how to create a disk image.
import java.io.*;
import java.util.Map;
import java.util.HashMap;
import com.redhat.et.libguestfs.*;
public class CreateDisk
{
static String output = "disk.img";
public static void main (String[] argv)
{
try {
GuestFS g = new GuestFS ();
// Create a raw-format sparse disk image, 512 MB in size.
RandomAccessFile f = new RandomAccessFile (output, "rw");
f.setLength (512 * 1024 * 1024);
f.close ();
// Set the trace flag so that we can see each libguestfs call.
g.set_trace (true);
// Attach the disk image to libguestfs.
Map<String, Object> optargs = new HashMap<String, Object>() {
{
put ("format", "raw");
put ("readonly", Boolean.FALSE);
}
};
g.add_drive_opts (output, optargs);
// Run the libguestfs back-end.
g.launch ();
// Get the list of devices. Because we only added one drive
// above, we expect that this list should contain a single
// element.
String[] devices = g.list_devices ();
if (devices.length != 1)
throw new Error ("expected a single device from list-devices");
// Partition the disk as one single MBR partition.
g.part_disk (devices[0], "mbr");
// Get the list of partitions. We expect a single element, which
// is the partition we have just created.
String[] partitions = g.list_partitions ();
if (partitions.length != 1)
throw new Error ("expected a single partition from list-partitions");
// Create a filesystem on the partition.
g.mkfs ("ext4", partitions[0]);
// Now mount the filesystem so that we can add files.
g.mount_options ("", partitions[0], "/");
// Create some files and directories.
g.touch ("/empty");
String message = "Hello, world\n";
g.write ("/hello", message.getBytes());
g.mkdir ("/foo");
// This one uploads the local file /etc/resolv.conf into
// the disk image.
g.upload ("/etc/resolv.conf", "/foo/resolv.conf");
// Note also that handles are automatically closed if they are
// reaped by the garbage collector. You only need to call close
// if you want to close the handle right away.
g.close ();
}
catch (Exception exn) {
System.err.println (exn);
System.exit (1);
}
}
}
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