+++ This bug was initially created as a clone of Bug #1663891 +++

Description of problem:  When creating boom entries, these don't actually appear in the grub boot menu. This only happens after manually regenerating the config. The documentation (https://github.com/bmr-cymru/boom) does not mention this, and this is also not necessary on RHEL 8 beta.

This might be a bug or missing feature in grub2 of course, so please reassign as appropriate.

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

boom-boot-0.9-4.fc29.noarch
grub2-common-2.02-62.fc29.noarch

How reproducible: Always


Steps to Reproduce:
1. Create a snapshot:
   lvcreate --snapshot -n rollback1 --size 1G fedora/root
2. Create a boom profile:
   boom profile create --from-host --uname-pattern fc29
3. Create a boom entry for the rollback:
   boom create --title "update rollback test" --rootlv fedora/rollback1
4. Reboot

Actual results: "Snapshots" submenu or rollback entry does not appear in grub menu. Only after "grub2-mkconfig  > /boot/grub2/grub.cfg" and rebooting again it does.


Expected results: Generated entries appear in the grub menu without further ado.


Additional info:

--- Additional comment from Martin Pitt on 2019-01-07 09:54:17 UTC ---

Actually it seems this isn't necessary after every new boom create/remove operation, just once after package install. This adds this snippet to /boot/grub2/grub.cfg:

### BEGIN /etc/grub.d/42_boom ###
submenu "Snapshots" {
    insmod blscfg
    bls_import
}
### END /etc/grub.d/42_boom ###

which seems to be enough to activate the BLS functionality and read /boot/loader/entries/*. So installation of the package should trigger a grub update.