K 10
svn:author
V 5
bcran
K 8
svn:date
V 27
2018-12-31T00:20:58.124736Z
K 7
svn:log
V 570
Fix ESP generation when using a gmirror, and when booting from RO medium

When using a gmirror, entries in /dev can be removed. So instead of using
kern.disks, get the list of disks from "gpart status -sg" instead.

We assume that any 'efi' partition that can't be mounted as msdosfs should
be used as an ESP. However, the ESP on the CD/DVD can't be mounted read-write
and so was being treated as if unformatted. Try the mount as read-only
instead, to catch cases like this.

Relnotes: yes
Sponsored by: Netflix
Differential Revision:	https://reviews.freebsd.org/D18645

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