Read \loader\loader.conf from the partition Sprout was loaded from and
use its default and timeout as the lowest priority source. Sprout now
picks the timeout in this order: LoaderConfigTimeoutOneShot,
--menu-timeout, the configuration, LoaderConfigTimeout, loader.conf. The
default entry order is the configuration, LoaderEntryDefault, loader.conf,
and a source that matches no entry falls through to the next one.
To tell an explicit menu-timeout from the built-in default, the
configuration option is now optional. Existing files are unaffected.
A loader.conf default of @saved selects the entry in
LoaderEntryLastBooted and saves the booted entry there on every boot.
After consuming a boot counter try, publish the renamed entry file in
LoaderBootCountPath and advertise the boot counting and saved entry
features.
* feat(bls): parse and render boot counters
* feat(bls): sort entries with no boot tries left last
* feat(boot): strip boot counters from bls entry ids
* feat(boot): consume bls boot counter tries before booting
* fix(boot): never default to a bad boot counter entry while a good one exists
Generators can now declare variant axes. Every generated entry is
multiplied by each combination of choices, one per axis. A choice sets
the axis name to the choice name and inserts its own values, and the
entry name is suffixed with the choice names.
Generators can also declare exclude rules, which remove generated
entries whose values match every glob pattern in a rule. This covers
unwanted variant combinations and entries like BLS rescue kernels.
Entry matching for default-entry and the bootloader interface now
accepts `*` anywhere in the pattern instead of only at the end, so
generated entry names can be matched regardless of the kernel version
in the middle of the name.
The BLS generator gains a pin-names option (default true, the existing
behavior). Two BLS generators reading the same directory previously
produced entries with identical names; disabling pin-names prefixes
them with the generator name instead. Sprout now warns when more than
one entry has the same name.
* docs(config): note that variants suffix pinned BLS entry names
Pinned BLS entry names match the BLS entry ids, but variants still
append their choice names, so those entries need a pattern like
<id>-* to be selected.
The sort-key of an entry was compared as written, without stamping the
values into it. Autoconfigured Linux entries all use "$kernel" as the
sort key, so they compared equal and kept the order the filesystem
listed them in, which made the default kernel arbitrary instead of the
newest one. Stamp the sort key along with the title.
alex