RFC: Support Linux command line variants in grub-mkconfig

[Martin Orr]

I would like to be able to choose between alternative Linux command 
lines in my GRUB menu (specifically, I want a "selinux=0" option, but I 
can imagine that people might want other things).  I could add an extra 
script to /etc/grub.d to do this, but then I have to copy the logic in 
10_linux to detect what kernel versions are available, and they do not 
appear in the correct place in the menu.  It would be simpler if you 
could specify variant command lines in /etc/default/grub and have them 
handled automatically in 10_linux.

The attached patch allows (for example) the following configuration in 
/etc/default/grub:
GRUB_LINUX_VARIANTS="noselinux kms"

GRUB_CMDLINE_LINUX_noselinux="selinux=0"
GRUB_LABEL_LINUX_noselinux="SELinux disabled"

GRUB_CMDLINE_LINUX_kms="i915.modesetting=1"
GRUB_LABEL_LINUX_kms="KMS enabled"

This patch is only intended as a demonstration: various details of the 
implementation still need to be sorted out, such as 
internationalization.  Suggestions of wildly different 
approaches/configuration interfaces are welcome.

Best wishes,

--
Martin Orr

grub-linux-variants.diff
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