Bug#302716: dpkg screws up GRUB's menu.lst

[Leszek Koltunski <leszek@serwer.3miasto.net>]

Here's a patch that will make 'update-grub' give a warning if the 
currently mounted root partition does not match kopts. Tested and seems to 
work. Apply with cd /sbin; patch update-grub < update-grub.patch



*** update-grub.old     Sun Apr  3 15:14:22 2005
--- update-grub Sun Apr  3 15:27:14 2005
***************
*** 548,551 ****
--- 548,574 ----
  }

+ check_root_partition()
+ {
+       current_opt=$1
+       kernel_version=$2
+
+       current_root_partition=$(find_root_device)
+       future_root_partition=$(echo "$current_opt" | sed -n 's/.*root=\(.*\)\ .*/\1/p')
+
+       if [ "$future_root_partition" ] ; then
+               if [ "$current_root_partition" != "$future_root_partition" ] ; then
+                       echo
+                       echo "            WARNING!"
+                       echo "Kernel $kernel_version will mount $future_root_partition as the root partition."
+                       echo "This differs from current root partition ($current_root_partition)."
+                       echo
+                       echo "If this is not what you want, edit GRUB'smenu.lst and"
+                       echo - adjust the \""$current_opt"\" parameter passed to the kernel
+                       echo "- adjust the \"kopts\" default parameter to prevent such problems in the future."
+                       echo
+               fi
+       fi
+ }
+
  write_kernel_entry()
  {
***************
*** 791,794 ****
--- 814,819 ----
        currentOpt=$(get_kernel_opt $kernelVersion)

+         check_root_partition "$currentOpt" "$kernelVersion"
+
        write_kernel_entry "$kernelVersion" "" "" "$grub_root_device" "$kernel" \
        "$currentOpt" "" "$initrd"