Handle missing GRUB_CMDLINE_LINUX_DEFAULT variable #19
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If
GRUB_CMDLINE_LINUX_DEFAULT
is unset in/etc/default/grub
, initialise it fromGRUB_CMDLINE_LINUX
. We write back the updated kernel command line asGRUB_CMDLINE_LINUX_DEFAULT
, the intent being to only apply tonormal (non-rescue) boots. However, on RedHat 9.x, the grubby command that runs next still updates GRUB_CMDLINE_LINUX.
Fixes #18.