Bug#500336: patch for grub detection

[Thomas Viehmann]

Hi,

based on Bastian's comments here and a clarification on IRC (thanks!), I
would like to propose the attached patch.
It implements the following behaviour
CONFIG_XEN + CONFIG_XEN_PRIVILEGED_GUEST
 --> added to xen0Kernels
CONFIG_XEN + CONFIG_PARAVIRT
 --> kept in kernel list
CONFIG_XEN + no CONFIG_PARAVIRT
 --> removed from kernel list
     (domU capable, but not bootable standalone)
no CONFIG_XEN
 --> kept in kernel list

For the Debian (most of etch and lenny for i386 and amd64) kernels,
the valid config flags are

config-2.6.18-6-486
config-2.6.18-6-686
config-2.6.18-6-686-bigmem
config-2.6.18-6-amd64
config-2.6.18-6-k7
config-2.6.18-6-vserver-686
config-2.6.18-6-vserver-amd64
config-2.6.18-6-vserver-k7
config-2.6.18-6-xen-686 CONFIG_XEN CONFIG_XEN_PRIVILEGED_GUEST
config-2.6.18-6-xen-amd64 CONFIG_XEN CONFIG_XEN_PRIVILEGED_GUEST
config-2.6.18-6-xen-vserver-686 CONFIG_XEN CONFIG_XEN_PRIVILEGED_GUEST
config-2.6.18-6-xen-vserver-amd64 CONFIG_XEN CONFIG_XEN_PRIVILEGED_GUEST
config-2.6.26-1-486 CONFIG_PARAVIRT
config-2.6.26-1-686 CONFIG_PARAVIRT
config-2.6.26-1-686-bigmem CONFIG_XEN CONFIG_PARAVIRT
config-2.6.26-1-amd64 CONFIG_PARAVIRT
config-2.6.26-1-openvz-686 CONFIG_XEN CONFIG_PARAVIRT
config-2.6.26-1-openvz-amd64 CONFIG_PARAVIRT
config-2.6.26-1-vserver-686 CONFIG_PARAVIRT
config-2.6.26-1-vserver-686-bigmem CONFIG_XEN CONFIG_PARAVIRT
config-2.6.26-1-vserver-amd64 CONFIG_PARAVIRT
config-2.6.26-1-xen-686 CONFIG_XEN CONFIG_XEN_PRIVILEGED_GUEST
config-2.6.26-1-xen-amd64 CONFIG_XEN CONFIG_XEN_PRIVILEGED_GUEST

so we end up with:

bootable with xen kernel
 - 2.6.26-1-xen-amd64
 - 2.6.26-1-xen-686
 - 2.6.18-6-xen-vserver-amd64
 - 2.6.18-6-xen-vserver-686
 - 2.6.18-6-xen-amd64
 - 2.6.18-6-xen-686
bootable standalone
 - 2.6.26-1-vserver-686-bigmem
 - 2.6.26-1-vserver-amd64
 - 2.6.26-1-vserver-686
 - 2.6.26-1-openvz-amd64
 - 2.6.26-1-openvz-686
 - 2.6.26-1-686-bigmem
 - 2.6.26-1-amd64
 - 2.6.26-1-686
 - 2.6.26-1-486
 - 2.6.18-6-vserver-k7
 - 2.6.18-6-vserver-amd64
 - 2.6.18-6-vserver-686
 - 2.6.18-6-686-bigmem
 - 2.6.18-6-k7
 - 2.6.18-6-amd64
 - 2.6.18-6-686
 - 2.6.18-6-486

I have also consolidated the detection and stuff to make use of the
sorted kernel list and postprocess that.
Even though the diff contains a changelog snippet, I would prefer to
have Bastian OK it and also happily leave uploading to the grub
maintainers, even though I could also NMU (e.g. when I get bored waiting
or it actually helps...).

Kind regards

T.
-- 
Thomas Viehmann, http://thomas.viehmann.net/
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