Filter out BLS entries not managed by bootc

[Dudecake]

Fixes #2228

The cases that the tests in the last commit check cannot occur anymore because of the changes in get_sorted_type1_boot_entries_helper. If they're unneeded, I can drop the commit.

[Johan-Liebert1]

This would work, but only for the first boot, and will probably fail on updates and switches as these entries won't be copied to the staged directory.

[Johan-Liebert1]

We have TYPE1_BOOT_DIR_PREFIX for this

[Dudecake]

I didn't want to change that from bootc_composefs- -> bootc_ as it's used in other places. The format the BLS entry seems to follow is bootc_${ID}-${verity}-${index}.conf, though maybe I've misunderstood what the BLS entry is...

[Dudecake]

This would work, but only for the first boot, and will probably fail on updates and switches as these entries won't be copied to the staged directory.

Sad face. That makes this pretty useless as installing to a populated ESP works without issue, only bootc status and bootc update are broken.

Would the caller of list_type1_entries have to filter out these entries before calling get_verity on them?

[Johan-Liebert1]

Would the caller of list_type1_entries have to filter out these entries before calling get_verity on them?

yes, and these need special treatment for updates/switches. Also, we need to make sure these appear last in the boot entries list etc etc. There are a few more cases that need to be handled