[Bug 1780598] [NEW] grub does not allow to specify recovery-only kernel options

[YS1]

Public bug reported:

In /etc/default/grub are two variables that enable customization of
kernel options : GRUB_CMDLINE_LINUX_DEFAULT for non-recovery entries and
GRUB_CMDLINE_LINUX for all entries (both recovery and non-recovery).

It is not possible to specify kernel options to be used for recovery
entries but not regular ones, which in my case is problematic as
modesetting parameters are at a contradiction in those cases.

I propose that the GRUB_CMDLINE_LINUX_RECOVERY variable would allow to
do so. This requires exporting this variable in the grub-mkconfig
script, so that it can be read by the 10_linux script.

There, I propose to keep the usual behaviour when the variable has not
been set, and to completely eschew it when the variable is set.

I am reporting here as it appears that upstream grub 10_linux does not
have a mechanism for recovery entries at all, so I think it is Ubuntu
specific.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: grub-common 2.02-2ubuntu8 [modified: usr/sbin/grub-mkconfig]
Architecture: amd64
SourcePackage: grub2

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 bionic

** Patch added: "grub-mkconfig.patch"
   https://bugs.launchpad.net/bugs/1780598/+attachment/5160954/+files/grub-mkconfig.patch

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https://bugs.launchpad.net/bugs/1780598

Title:
  grub does not allow to specify recovery-only kernel options

Status in grub2 package in Ubuntu:
  New

Bug description:
  In /etc/default/grub are two variables that enable customization of
  kernel options : GRUB_CMDLINE_LINUX_DEFAULT for non-recovery entries
  and GRUB_CMDLINE_LINUX for all entries (both recovery and non-
  recovery).

  It is not possible to specify kernel options to be used for recovery
  entries but not regular ones, which in my case is problematic as
  modesetting parameters are at a contradiction in those cases.

  I propose that the GRUB_CMDLINE_LINUX_RECOVERY variable would allow to
  do so. This requires exporting this variable in the grub-mkconfig
  script, so that it can be read by the 10_linux script.

  There, I propose to keep the usual behaviour when the variable has not
  been set, and to completely eschew it when the variable is set.

  I am reporting here as it appears that upstream grub 10_linux does not
  have a mechanism for recovery entries at all, so I think it is Ubuntu
  specific.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: grub-common 2.02-2ubuntu8 [modified: usr/sbin/grub-mkconfig]
  Architecture: amd64
  SourcePackage: grub2

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