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// Example showing how to inspect a virtual machine disk.
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.redhat.et.libguestfs.*;
public class InspectVM
{
static final Comparator<String> COMPARE_KEYS_LEN =
new Comparator<String>() {
public int compare (String k1, String k2) {
return k1.length() - k2.length();
}
};
public static void main (String[] argv)
{
try {
if (argv.length != 1)
throw new Error ("usage: InspectVM disk.img");
String disk = argv[0];
GuestFS g = new GuestFS ();
// Attach the disk image read-only to libguestfs.
Map<String, Object> optargs = new HashMap<String, Object>() {
{
//put ("format", "raw");
put ("readonly", Boolean.TRUE);
}
};
g.add_drive (disk, optargs);
// Run the libguestfs back-end.
g.launch ();
// Ask libguestfs to inspect for operating systems.
String roots[] = g.inspect_os ();
if (roots.length == 0)
throw new Error ("inspect_vm: no operating systems found");
for (String root : roots) {
System.out.println ("Root device: " + root);
// Print basic information about the operating system.
System.out.println (" Product name: " +
g.inspect_get_product_name (root));
System.out.println (" Version: " +
g.inspect_get_major_version (root) +
"." +
g.inspect_get_minor_version (root));
System.out.println (" Type: " +
g.inspect_get_type (root));
System.out.println (" Distro: " +
g.inspect_get_distro (root));
// Mount up the disks, like guestfish -i.
//
// Sort keys by length, shortest first, so that we end up
// mounting the filesystems in the correct order.
Map<String,String> mps = g.inspect_get_mountpoints (root);
List<String> mps_keys = new ArrayList (mps.keySet ());
Collections.sort (mps_keys, COMPARE_KEYS_LEN);
for (String mp : mps_keys) {
String dev = mps.get (mp);
try {
g.mount_ro (dev, mp);
}
catch (Exception exn) {
System.err.println (exn + " (ignored)");
}
}
// If /etc/issue.net file exists, print up to 3 lines.
String filename = "/etc/issue.net";
if (g.is_file (filename)) {
System.out.println ("--- " + filename + " ---");
String[] lines = g.head_n (3, filename);
for (String line : lines)
System.out.println (line);
}
// Unmount everything.
g.umount_all ();
}
}
catch (Exception exn) {
System.err.println (exn);
System.exit (1);
}
}
}
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