1 files changed, 44 insertions, 0 deletions
diff --git a/debian/legacy/upgrade-from-grub-legacy b/debian/legacy/upgrade-from-grub-legacy
new file mode 100755
index 0000000..9ed829d
--- /dev/null
+++ b/debian/legacy/upgrade-from-grub-legacy
@@ -0,0 +1,44 @@
+#!/bin/bash -e
+
+if test ! -f /boot/grub/core.img ; then
+  echo -e "\ncore.img doesn't exist, trying to create it.\n" >&2
+  grub-install --no-floppy --grub-setup=/bin/true "(hd0)" > /dev/null
+fi
+
+echo RESET grub-pc/install_devices | debconf-communicate >/dev/null
+
+# Pretend we're upgrading grub-pc.  This will make our postinst DTRT.
+DPKG_MAINTSCRIPT_NAME=postinst \
+  DPKG_MAINTSCRIPT_PACKAGE=grub-pc \
+  UPGRADE_FROM_GRUB_LEGACY=1 \
+  /var/lib/dpkg/info/grub-pc.postinst configure dummy-version
+
+if test ! -f /boot/grub/grub.cfg ; then
+  echo -e "\nCalling update-grub to generate grub.cfg\n" >&2
+  update-grub || cat << EOF
+Failed to generate /boot/grub/grub.cfg but GRUB2 has been already installed to
+your MBR.
+THIS MEANS YOU HAVE CURRENTLY AN UNBOOTABLE SYSTEM.
+Either fix the error from update-grub and run $0 again
+or install old grub again and run grub-install from it to have again
+grub-legacy in your MBR.
+EOF
+fi
+
+# These never contain any valuable information, and they aren't useful for
+# boot anymore, since we just overwrote MBR/PBR.
+rm -f /boot/grub/{{xfs,reiserfs,e2fs,fat,jfs,minix}_stage1_5,stage{1,2}}
+# Remove marker file used to indicate that grub-install was run rather than
+# this script.  Since stage2 has been removed, we don't need this any more.
+rm -f /boot/grub/grub2-installed
+
+cat << EOF
+
+GRUB Legacy has been removed, but its configuration files have been preserved,
+since this script cannot determine if they contain valuable information.  If
+you would like to remove the configuration files as well, use the following
+command:
+
+  rm -f /boot/grub/menu.lst*
+
+EOF