Find win7 partition; explain if can't find configfile; instructions

mbusb.cfg

@@ -1,7 +1,9 @@
 # Partition holding files
+regexp --set=rootdisk "^(.*),.*" "$root"
+regexp --set=rootpartnum "^.*,.*([0-9]+)" "$root"
 probe -u $root --set=rootuuid
 set imgdevpath="/dev/disk/by-uuid/$rootuuid"
-export imgdevpath rootuuid
+export imgdevpath rootuuid rootdisk rootpartnum
 
 # Custom variables
 set isopath="/boot/isos"
@@ -16,8 +18,85 @@ if [ -e "$prefix/mbusb.cfg.local" ]; then
   source "$prefix/mbusb.cfg.local"
 fi
 
+# Function to look for boot files
+function search_files {
+  root="$1"
+  found=""
+
+  insmod bitmap
+  insmod jpeg
+  insmod png
+  insmod tga
+
+  for grubfile in \
+    /boot/grub/loopback.cfg \
+    /boot/grub/grub.cfg \
+    /boot/grub/x86_64-efi/grub.cfg \
+    /EFI/BOOT/grub.cfg; do
+    if [ -e "$grubfile" ]; then
+      found="found"
+      menuentry "GRUB boot ($grubfile)" "$grubfile" {
+        grub_file="$2"
+        configfile "$grub_file"
+      }
+    fi
+  done
+
+  for syslinuxfile in \
+    /isolinux.cfg \
+    /syslinux.cfg \
+    /isolinux/isolinux.cfg \
+    /isolinux/syslinux.cfg \
+    /syslinux/isolinux.cfg \
+    /boot/isolinux.cfg \
+    /boot/isolinux/isolinux.cfg \
+    /boot/syslinux.cfg \
+    /boot/syslinux/isolinux.cfg \
+    /boot/syslinux/syslinux.cfg; do
+    if [ -e "$syslinuxfile" ]; then
+      found="found"
+      menuentry "SYSLINUX boot ($syslinuxfile)" "$syslinuxfile" {
+        syslinux_file="$2"
+        syslinux_configfile -i "$syslinux_file"
+      }
+    fi
+  done
+
+  for legacyfile in \
+    /boot/grub/menu.lst \
+    /menu.lst; do
+    if [ -e "$legacyfile" ]; then
+      found="found"
+      menuentry "GRUB legacy boot ($legacyfile)" "$legacyfile" {
+        legacy_file="$2"
+        legacy_configfile "$legacy_file"
+      }
+    fi
+  done
+
+  if [ "x$grub_platform" == "xefi" ]; then
+    for efifile in \
+      /efi/boot/bootx64.efi \
+      /efi/microsoft/boot/bootmgfw.efi; do
+      if [ -e "$efifile" ]; then
+        found="found"
+        menuentry "EFI boot ($efifile)" "$efifile" {
+          efi_file="$2"
+          chainloader "$efi_file"
+        }
+      fi
+    done
+  fi
+  if [ "x$found" == "x" ]; then
+    echo "no bootable things found on $root"
+    sleep -v -i 5
+  fi
+
+}
+
 # MultiBoot USB menu
 submenu "Multiboot ->" {
+
   # Warning for 32-bit systems
   if ! cpuid -l; then
     clear
@@ -30,9 +109,76 @@ submenu "Multiboot ->" {
     echo
   fi
 
-  # Load configuration files
-  echo -n "Loading configuration files... "
-  for cfgfile in $prefix/mbusb.d/*.d/*.cfg; do
-    source "$cfgfile"
-  done
+  # Load configuration for ISO/kernel files
+  submenu "Boot supported ISO/kernel files ->" {
+    echo -n "Loading configuration files... "
+    for cfgfile in $prefix/mbusb.d/*.d/*.cfg; do
+      source "$cfgfile"
+    done
+  }
+
+  # Search partitions for boot files
+  submenu "Auto-detect bootable partitions ->" {
+    echo -n "Searching pendrive's partitions... "
+    for part in ($rootdisk,*); do
+      regexp --set=partnum "^.*,.*([0-9]+)" "$part"
+      if [ "$partnum" -le "$rootpartnum" ]; then continue; fi
+      submenu "$part ->" "$part" {
+        part_name="$2"
+        probe --fs-uuid $part_name --set=part_uuid
+        search --fs-uuid --no-floppy --hint=$part_name --set=root $part_uuid
+        # Look for boot files
+        search_files $root
+      }
+    done
+  }
+
+  # Search ISO files for boot files
+  submenu "Auto-detect ISO's configfiles ->" {
+    echo -n "Looking for ISO files... "
+    for isofile in $isopath/*.iso $isopath/*.img; do
+      if [ -e "$isofile" ]; then
+        regexp --set=isoname "$isopath/(.*)" "$isofile"
+        submenu "$isoname ->" "$isofile" {
+          iso_path="$2"
+          export iso_path
+          search --set=root --file "$iso_path"
+          loopback loop "$iso_path"
+          root=(loop)
+          # Look for boot files
+          search_files $root
+        }
+      fi
+    done
+  }
+
+  # Use MEMDISK to load ISO files
+  submenu "Use MEMDISK to boot ISO files ->" {
+    echo -n "Looking for ISO files... "
+    for isofile in $isopath/*.iso; do
+      if [ -e "$isofile" ]; then
+        regexp --set=isoname "$isopath/(.*)" "$isofile"
+        menuentry "$isoname" "$isofile" {
+          iso_path="$2"
+          bootoptions="iso raw"
+          linux16 $prefix/memdisk $bootoptions
+          initrd16 $iso_path
+        }
+      fi
+    done
+    echo
+    echo -n "Looking for ISO files... "
+    for imgfile in $isopath/*.img; do
+      if [ -e "$imgfile" ]; then
+        regexp --set=imgname "$isopath/(.*)" "$imgfile"
+        menuentry "$imgname" "$imgfile" {
+          img_path="$2"
+          bootoptions="raw"
+          linux16 $prefix/memdisk $bootoptions
+          initrd16 $img_path
+        }
+      fi
+    done
+  }
+
 }