discover/grub: Improve BLS grub environment variables expansion

The fields from a BootLoaderSpec file can contain environment variables,
in GRUB 2 these are show verbatim and are evaluated later when an entry
is selected. But on Petitboot these have to be expanded before creating
the GRUB 2 resources and show in the UI the values after the evaluation.

The current blscfg handler had a very limited support for variables, it
only had support for the options field and also didn't take into account
that variables could be mixed with literal values.

So for example the following fields were not expanded correctly:

  linux   $bootprefix/vmlinuz

  options $kernelopts foo=bar

  options foo=bar $kernelopts

  options $kernelopts $debugopts

Also change some of the tests to cover mixing variables and literals.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

0 files changed, 0 insertions, 0 deletions