Re: Odd problem with submenus

[Andrey Borzenkov <arvidjaar@gmail.com>]

В Tue, 01 Jul 2014 17:59:35 +0100
John Haxby <john.haxby@oracle.com> пишет:

> Hello,
> 
> I have a warning generated by grub2-mkconfig that shows up on various
> systems that I'm not sure what to do about.  Well, I know I can ignore
> it, but I'm not sure what do do about not getting the warning in the
> first place.
> 
> On this machine here, I have
> 
> menuentry 'Fedora, with Linux 3.14.9-200.fc20.x86_64' --class ...
> 
> and grub2-set-default 'Fedora, with ...' is OK, but then
> 
> and I also have GRUB_DISABLE_SUBMENU=true i /etc/default/grub, so
> 
> $ grub2-mkconfig -o /boot/grub2/grub.cfg
> ...
> Warning: Please don't use old title `Fedora, with Linux
> 3.14.9-200.fc20.x86_64' for GRUB_DEFAULT, use `Advanced options for
> Fedora>Fedora, with Linux 3.14.9-200.fc20.x86_64' (for versions before
> 2.00) or
> `gnulinux-advanced-d87b5f54-5bfb-45bd-b300-f4b1db6d5dfb>gnulinux-3.14.9-200.fc20.x86_64-advanced-d87b5f54-5bfb-45bd-b300-f4b1db6d5dfb'
> (for 2.00 or later)
> 
> Exhorting me to use a submenu default when there are no submenus is
> clearly wrong, so in /etc/grub.d/10_linux (and the other
> platform-specific files) there's:
> 
> >       if [ x"$title" = x"$GRUB_ACTUAL_DEFAULT" ] || [ x"Previous Linux versions>$title" = x"$GRUB_ACTUAL_DEFAULT" ]; then
> >           replacement_title="$(echo "Advanced options for ${OS}" | sed 's,>,>>,g')>$(echo "$title" | sed 's,>,>>,g')"
> >           quoted="$(echo "$GRUB_ACTUAL_DEFAULT" | grub_quote)"
> >           title_correction_code="${title_correction_code}if [ \"x\$default\" = '$quoted' ]; then default='$(echo "$replacement_title" | grub_quote)'; fi;"
> >           grub_warn "$(gettext_printf "Please don't use old title \`%s' for GRUB_DEFAULT, use \`%s' (for versions before 2.00) or \`%s' (for 2.00 or later)" "$GRUB_ACTUAL_DEFAULT" "$replacement_title" "gnulinux-advanced-$boot_device_id>gnulinux-$version-$type-$boot_device_id")"
> >       fi
> 
> It's easy enough to add a test for GRUB_DISABLE_SUBMENU here but I'm at
> a loss to know why this clause is needed at all.  I know it means that
> if I have submenus enabled then I can just set the default to be the
> title of a submenu and not worry about the "Advanced options ..." bit,
> but it looks to me as though it was just a transition thing which is
> really no longer needed.
> 

You never know it; there is no reason to break working configuration.

> Is this really no longer needed or am I missing something?  I'm happy to
> submit a patch either way.
> 


Yes, please, make it conditionally add submenu title to
replacement_title based on GRUB_DISABLE_SUBMENU. Please also fix all
scripts (the bug is not limited to linux).