[Bug 286702] sysutils/grub2-bhyve: fail to boot linux vm with newer ext4fs filesystem flags

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286702

            Bug ID: 286702
           Summary: sysutils/grub2-bhyve: fail to boot linux vm with newer
                    ext4fs filesystem flags
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: ale@biancalanas.net

I found that alpine-3.20.1 and newer use additional (metadata_csum_seed) ext4fs
flags that aren't recognized by grub2-bhyve. 

This bug keeps any linux that use ext and newer flags (flags not ignored in
grub code) from boot using grub in bhyve, the scenario is that you can install
the os but fail to boot after install.

The work around that I follow was to disable the xxx flag using:

   tune2fs -O ^metadata_csum_seed /dev/md0s1


There are two fixes in upstream grub, for different flags:
 
https://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/fs/ext2.c?id=7fd5feff97c4b1f446f8fcf6d37aca0c64e7c763
 
https://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/fs/ext2.c?id=2e9fa73a040462b81bfbfe56c0bc7ad2d30b446b

Also there's a pull request pending approval at grub2-bhyve github repo that
fixes the problem:
  https://github.com/grehan-freebsd/grub2-bhyve/pull/18

It's possible to merge the pull request and update the port ?

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