rationale: update-grub2 (or more likely os-prober) 's failure can leave
the system in an unbootable state

colorize it the same way as FAT or NTFS

thus workarounding unbootable minimal system as dracut's crypt module
depends on it

It should probably a dep in cryptsetup

when fs was mounted on demande (eg: during installation)

Not a true FS as it doesn't support extended attributes and thus fails
to install packages (mga#26354) but we want to be able to eg: inspect
it ("View" in diskrake)

bit of support was there but code could not be reached
also actually include nilfs-resize for resizing NILFS2

It's only supported online:
"This command is valid only for mounted NILFS2 file systems, and
will fail if the device has no active mounts."

Note that ext3/4 could use the same path but only for growing.
XFS could also share that path...