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docs: add /loader/entries.srel to the boot loader spec

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This new file is supposed to address conflicts with Fedora/Grub's
frankenbootloaderspec implementation, that squatted the /loader/entries/
dir, but place incompatible files in them (that do variable expansion?).

A simple text file /loader/entries.srel shall indicate which spec is
implemented. If it contains the string "type1\n" then the
/loader/entries/ directory implements our standard spec, otherwise
something else.
This commit is contained in:
Lennart Poettering 2022-03-17 18:35:53 +01:00
parent ffc97a1cc4
commit f6ad0282c9
1 changed files with 12 additions and 0 deletions
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docs/BOOT_LOADER_SPECIFICATION.md
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@ -309,6 +309,18 @@ focus for this specification. More specifically, on non-EFI systems
configuration snippets following this specification cannot be used to spawn
other operating systems (such as Windows).
Unfortunately, there are implementations of boot loading infrastructure that
are also using the /loader/entries/ directory, but place files in them that are
not valid by this specification. In order to minimize confusion a boot loader
implementation may place a file /loader/entries.srel next to the
/loader/entries/ directory containing the ASCII string "type1" (suffixed
with a UNIX newline). Tools that need to determine whether an existing
directory implements the semantics described here may check for this file and
contents: if it exists and contains the mentioned string, it shall assume a
standards compliant implementation is in place. If it exists but contains a
different string it shall assume non-standard semantics are implemented. If the
file does not exist no assumptions should be made.
### Type #2 EFI Unified Kernel Images
A unified kernel image is a single EFI PE executable combining an EFI stub