Merge pull request #14 from mariux64/mxgrub-improve-message-output

mxgrub: check for consistent GRUB installation

mxgrub/mxgrub

@@ -10,6 +10,7 @@ sub USAGE { return <<"EOF" }
     $0 --list      : list available labels
     $0 --update    : only scan /boot and rewrite grub.cfg
     $0 --initramfs : update /boot/grub/initramfs.igz from /project/admin/initramfs
+    $0 --test      : perform miscellaneous tests (VX50 board)
 EOF
 
 sub sys {
@@ -41,6 +42,23 @@ sub check_mbr {
 
 }
 
+sub check_grub_installation {
+  my $fingerprint='[ab]*.mod'; # this 'scans' just a dozen, and not 200 files.
+  my $sum_lib  = ` cat /usr/lib/grub/i386-pc/$fingerprint | md5sum `;
+  my $sum_boot = ` cat /boot/grub/i386-pc/$fingerprint | md5sum `;
+  my @root_dev = root_dev();
+
+  warn << "EOF" if $sum_lib ne $sum_boot;
+
+  Note: GRUB version installed in /usr differs from GRUB version used to boot.
+
+  Consider updating the boot-loader with:
+
+           grub-install --boot-directory=/boot $root_dev[1]
+
+EOF
+}
+
 # /usr/include/sys/sysmacros.h
 #  MMMM.MMMM MMMM.MMMM MMMM.MMMM MMMM.MMMM mmmm.mmmm mmmm.MMMM MMMM.MMMM mmmm.mmmm
 
@@ -255,6 +273,8 @@ sub cmd_initramfs {
 	sys('bash','-c','cd /project/admin/initramfs;find .|cpio -H newc -o | gzip > /boot/grub/initramfs.igz');
 }
 
+check_grub_installation
+
 our ($opt_list,$opt_update,$opt_initramfs,$opt_test);
 
 GetOptions(