Clayton Craft
6e0ebe437b
This adds a second install_boot_option call to register a Boot#### entry
pointing at systemd-boot-fallback{arch}.efi, and place it immediately
after the primary entry in BootOrder.
The fallback file does not exist on the ESP on first install and is
only created on first update when the existing primary binary is
rotated to the fallback path. We register the variable anyway, so
that the entry exists in the BootOrder once the fallback file shows up.
Until then, firmware that reaches the fallback entry will fail to
load it and fall through to the next entry in BootOrder, which is
fine. install_boot_option gains a require_existing parameter so the
existing early return on a missing ESP path can be skipped for the
fallback, where a missing path is expected.
This also does a bit of refactoring by splitting the bottom part of
run_install() into a new install_variables() function that handles
registering both the primary and fallback entries.
System and Service Manager
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