Clayton Craft
037b9a0680
When a primary sd-boot binary already exists on the ESP and is being
updated, it is copied to systemd-boot-fallback{arch}.efi before installing
the new version. This gives firmware a fallback Boot#### entry pointing
to the previous binary in case the new one fails to load.
The fallback is preserved (not overwritten) when its product and version
match the currently booted bootloader (read from the LoaderInfo EFI
variable), since that means it already holds the known good binary that
booted this session. In all other cases it is overwritten with the current
primary, when no fallback exists yet, when LoaderInfo is unavailable, or
when the fallback's product or version differs from what booted.
This also moves the version_check() call up so its result determines
both the rotation decision and the main copy, and avoids a duplicate
check (and duplicate "Skipping..." log) when the binary is already
current.
System and Service Manager
Details
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