Re: exact semantics of union mounts (and TRYEMULROOT)

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Mon, 17 Jul 2017 10:12:26 -0400 (EDT)
    From:        Mouse <mouse%Rodents-Montreal.ORG@localhost>
    Message-ID:  <201707171412.KAA20788%Stone.Rodents-Montreal.ORG@localhost>

  | That desire is to take a read-only filesystem and, effectively, mount
  | it read-write, with all changes being performed in a second ("front")
  | layer.

I think that is more unionfs rather than -o union.

kre