[Pm-utils] [patch] disable suspend when kernel image changed

[Nigel Cunningham]

Hi.

On 08/04/10 05:52, Richard Zidlicky wrote:
> Hi,
>
> trying to fix this crash situation: /boot/vmlinuz-XXX exists and is the currently
> running kernel, I decide to reconfigure and recompile it, overwrite /boot/vmlinuz-XXX
> and hit pm-hibernate.
>
> Currently 01grub does not recognize that the kernel image vmlinuz-XXX is not
> identical with that of the running kernel and will suspend. Resume fails with
> "version mismatch".
>
> I have cooked up this patch as a fix to avoid the problem. It would be nice to do
> something more sophisticated but I do not know how to figure out the exact version
> from the saved image in a portable way without draging in exotic dependencies.
> Another option would be to compare the date stamp with uptime if boot.log is
> something distribution specific - slightly more difficult scripting-wise and not
> sure if it is needed.
>
> Supposed to work on Fedora but not really tested yet.
>
> --- 01grub.rz   2010-04-07 19:52:02.000000000 +0200
> +++ 01grub      2010-04-07 21:22:30.000000000 +0200
> @@ -15,6 +15,7 @@
>
>          [ -x /sbin/grubby -a -x /sbin/grub ] || return $NA
>          [ -e "/boot/vmlinuz-$(uname -r)" ] || return 1
> +       [ /var/log/boot.log -ot "/boot/vmlinuz-$(uname -r)" ]&&  return $NA
>          out=$(/sbin/grubby --info /boot/vmlinuz-$(uname -r) |grep index)
>          [ -n "${out}" ] || return 1
>          current=${out#index=}

With anything relatively recent (post about 2.6.27 IIRC), this should be 
unnecessary. Code has been added so that you can hibernate with one 
kernel and resume with another.

Regards,

Nigel