Fix install command: JGrub whole-disk device names, Step.back handling, getMountPoint() placement

- JGrub.install(): handle whole-disk device names (no partition suffix) by
  defaulting partition number to 0 instead of failing to parse empty suffix
- AbstractInstaller.start(): check Step.back and navigate to previous action
- GrubInstallerAction: move getMountPoint() from collect() to execute() so
  the mount point is set after the user confirms the device, not before

- Rebuild ISO (cd-x86-lite) with corrected menu-cdrom.lst where 'all plugins'
  entries use /full.jgz instead of /default.jgz

- Validate GRUB installation on VirtualBox target disk: stages 1, 1.5, 2
  written successfully, menu.lst confirmed with full.jgz entries

Author: LSantha

distr/src/install/org/jnode/install/AbstractInstaller.java

@@ -50,6 +50,13 @@ public void start() {
                 Step step = input.collect();
                 if (step != null && step.equals(Step.quit))
                     break;
+                if (step != null && step.equals(Step.back)) {
+                    if (lit.hasPrevious())
+                        action = lit.previous();
+                    else
+                        break out;
+                    continue;
+                }
             }
 
             try {

distr/src/install/org/jnode/install/action/GrubInstallerAction.java

@@ -38,8 +38,10 @@
  */
 public class GrubInstallerAction implements InstallerAction {
     private JGrub jgrub;
+    private InputContext inContext;
 
     public ActionInput getInput(final InputContext inContext) {
+        this.inContext = inContext;
         return new ActionInput() {
             public AbstractInstaller.Step collect() {
                 try {
@@ -50,7 +52,6 @@ public AbstractInstaller.Step collect() {
                     JGrub jgrub = new JGrub(new PrintWriter(new OutputStreamWriter(System.out)), disk);
 
                     GrubInstallerAction.this.jgrub = jgrub;
-                    inContext.setStringValue(ActionConstants.INSTALL_ROOT_DIR, jgrub.getMountPoint());
                     return AbstractInstaller.Step.forth;
                 } catch (Exception e) {
                     return AbstractInstaller.Step.back;
@@ -63,6 +64,7 @@ public void execute() throws Exception {
         if (jgrub == null) {
             throw new IllegalStateException("No installation device selected");
         }
+        inContext.setStringValue(ActionConstants.INSTALL_ROOT_DIR, jgrub.getMountPoint());
         jgrub.install();
     }
 

fs/src/commands/org/jnode/fs/jfat/command/JGrub.java

@@ -91,10 +91,11 @@ public void install() throws GrubException {
             i--;
         }
         final String parentDeviceName = deviceName.substring(0, i + 1);
-        final int partitionNumber = Integer.parseInt(deviceName.substring(i + 1));
+        final String partitionSuffix = deviceName.substring(i + 1);
+        final int partitionNumber = partitionSuffix.isEmpty() ? 0 : Integer.parseInt(partitionSuffix);
         //
 
-        final Device parentDevice = getDevice(dm, parentDeviceName);
+        final Device parentDevice = parentDeviceName.isEmpty() ? device : getDevice(dm, parentDeviceName);
         final BlockDeviceAPI parentDeviceApi = getBlockDeviceAPI(parentDevice);
 
         stage1.format(parentDeviceApi);