Commits on Sep 26, 2019

1. grub2: Exit gracefully if the configuration has BLS enabled …

   Since Fedora 30 grub2 has support to populate its menu entries from the
   BootLoaderSpec fragments in /boot/loader/entries, so there's no need to
   generate menu entries anymore using the /etc/grub.d/15_ostree script.
   
   But since ostree doesn't update the bootloader, it may be that the grub2
   installed is an old one that doesn't have BLS support.
   
   For new installs, GRUB_ENABLE_BLSCFG=true is set in /etc/default/grub to
   tell the /etc/grub.d/10_linux script if a blscfg command has to be added
   to the generated grub2 config file.
   
   So check if BLS is enabled in /etc/default/grub and only add the entries
   if that's not the case. Otherwise the menu entries will be duplicated.
   
   The approach has the drawback that if a user sets GRUB_ENABLE_BLSCFG=true
   in /etc/default/grub without updating grub2, they will get an empty menu.
   Since there won't be any entries created by the 30_ostree script and the
   blscfg command won't work on the older grub2.
   
   Unfortunately there is no way to know if the installed grub2 already has
   BLS support or not.
   
   Related: https://bugzilla.redhat.com/show_bug.cgi?id=1751272#c27

   

   martinezjavier committed Sep 26, 2019
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