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+++ This bug was initially created as a clone of Bug #1663864 +++

Description of problem: As the subject says. This means that serial console, kdump, and other settings don't work when booting into a rollback.


Version-Release number of selected component (if applicable):

lvm2-python-boom 7:0.9-13.el7_6.2
grub2-common-2.02-0.76.el7.noarch

How reproducible: Always

1. Create a snapshot:
   lvcreate --snapshot -n rollback1 --size 1G rhel/root
2. Create a boom entry for the rollback:
   boom create --title "update rollback test" --rootlv rhel/rollback1
3. Reboot into the snapshot

Actual results: Serial console not working, /proc/cmdline is missing all the options:

# cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-57.el8.x86_64 root=/dev/rhel/rollback1 ro rd.lvm.lv=rhel/rollback1


Expected results: GRUB_CMDLINE_LINUX settings are respected, like in

# cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-57.el8.x86_64 root=/dev/mapper/rhel-root ro rd_NO_PLYMOUTH crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root console=ttyS0,115200 net.ifnames=0 biosdevname=0


Additional info:

There are no plans to update the boom package in Red Hat Enterprise Linux 7 at the current time. As the use of the GRUB_CMDLINE_LINUX variable in RHEL continues to develop we will track impacts on the boom package in bug 1663864.