Re: [Xen-devel] [XEN PATCH 0/3] read grubenv and set default from it

[Steven Haigh <netwiz@xxxxxxxxx>]

Just for the record, the grub packages have been updated in Fedora 31 
to automatically disable BLS when installing / removing a kernel on Xen 
Dom0 / DomU installations.
As such, we should never come across a Fedora 31 install with BLS 
enabled from this point forwards.
There is currently ongoing work to disable BLS during the installation 
via anaconda - but this hasn't hit yet - and I believe it's already a 
freeze exception.
If / when pygrub is able to properly read and boot from BLS based 
configurations (I'm not sure if this patchset makes pygrub BLS 
compatible, or just fixes the existing issues) - but we can look at 
revisiting removing these workarounds from anaconda / grub2 packages in 
F30 / F31 / Rawhide.
Steven Haigh

📧 netwiz@xxxxxxxxx     💻 https://www.crc.id.au
📞 +613 9001 6090       📱 +614 1293 5897


On Fri, Oct 25, 2019 at 22:52, "YOUNG, MICHAEL A." 
<m.a.young@xxxxxxxxxxxx> wrote:
> This series of patches is to improve the parsing by pygrub of grub
> configuration on Fedora. The current result of parsing is generally
> that the second kernel listed is set as the default due to a
> set default=1 line in grub.cfg which is only intended to be
> reached after repeated boot failures.
>
> The patches read the grubenv file (which consists of key=value lines
> padded to 1024 characters by # characters) to get the values of
> next_entry and saved_entry, which can be a kernel string or an
> order number. Unfortunately, for Fedora 31 at least, this is
> often a BLS-style string so it isn't necessarily useful. The patches
> use the value of next_entry or of saved_entry to set the default
> kernel or sets it to the first kernel listed if those values are set
> but not used.
>
>
> Michael Young (3):
>   set default kernel from grubenv next_entry or saved_entry
>   read a grubenv file if it is next to the grub.cfg file
>   Example Fedora 31 grub.cfg and grubenv files
>
>  tools/pygrub/examples/fedora-31.grub.cfg | 200 
> +++++++++++++++++++++++
>  tools/pygrub/examples/fedora-31.grubenv  |   5 +
>  tools/pygrub/src/GrubConf.py             |  31 +++-
>  tools/pygrub/src/pygrub                  |  21 ++-
>  4 files changed, 253 insertions(+), 4 deletions(-)
>  create mode 100644 tools/pygrub/examples/fedora-31.grub.cfg
>  create mode 100644 tools/pygrub/examples/fedora-31.grubenv
>
> --
> 2.21.0
>
>
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