Commits on Feb 7, 2024

1. factory: create components compatible mount units for kernel …

   The kernel-modules components require that /lib/{modules,firmware} can
   be created by composition of what is shipped with the kernel plus
   parts that will be shipped by said component type.
   
   For this, we need to have modinfo files in a writable directory as
   these files will need to be regenerated when a new kernel-modules
   component is installed. These files need to be readable from
   /lib/modules/UTS_RELEASE. Inside this directory, "kernel" and "vdso"
   subfolders will be bind-mounted from the kernel snap, while "updates"
   will have modules from the components.
   
   In the case of UC, for modules we need an additional bind mount on top
   of the directory coming from the base (this is not needed for hybrid
   systems).
   
   In the case of firmware, content from the kernel will be mounted to
   /lib/firmware as in the past. However, we will rely on the existence
   of a /lib/firmware/updates in the kernel to mount firware coming from
   components.
   
   The mount units for the active kernel are created at boot time and
   stored in /run/systemd/system so they are accessible after the switch
   root, and are actually mounted after the switch happens, but with
   dependencies set so kernel modules are not loaded before the mounts
   are ready. This replaces the fstab/generator that was creating the
   mounts for modules/firmware in UC and hybrid respectively, and now
   unifies the approach for both.

   

   alfonsosanchezbeato committed Feb 7, 2024
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