Do not source non-existant file.

Create EFI/Linux directory if it does not exist.

Final objective: clearly separate the generation and installation stage.
See df79460f (generation: Add generation scripts.)

This scripts install an initramfs image from networkcache on the machine
running them.

Update variable name.

Final objective: clearly separate the generation and installation stage.

This scripts generate and sign an initramfs image.
Parameters MUST be set to fit the target machine.

Use Nexedi's OBS repository.
Use correct package name and versions.
Fix some bugs.