It's now 2024. Pytest is superior to unittest and has been available in
Debian since at least buster. Just use it. While here, invoke it as a
module to avoid whatever Debian is naming the CLI entrypoint these days.

https://phabricator.endlessm.com/T31604

This is from an Endless VM using TianoCore with Secure Boot enabled
(and throwaway keys in the databases). A pytest fixture is provided to
make testing with the data safer.

When the partition UUID for the ESP is updated, any load options
referencing the partition become invalid. Add a tool to update all load
options using the old partition UUID to the new partition UUID. This
uses the libefivar and libefiboot packages to access EFI variables and
interpret the data appropriately.

https://phabricator.endlessm.com/T31604

When the ESP partition ID is regenerated, any EFI load options
referencing the old partition ID become invalid. While shim's fallback
will generate a new load option on the next boot, a downstream patch is
needed to make sure the invalid option is removed.

Rather than having shim cleanup this situation, update the load options
at the time the partition UUID is changed. Since both the old and new
UUIDs are known, eos-update-efi-uuid can update only the affected load
options without changing or deleting load options that aren't affected
by the UUID change.

Note that this runs eos-update-efi-uuid in verbose mode, which is pretty
noisy. When we have confidence this is doing the right thing, we can
drop the -v option.

https://phabricator.endlessm.com/T31604