[Bug 1857398] Re: ubiquity should support encryption by default with zfsroot, with users able to opt in to running change-key after install

[fields_g]

> It is not appropriate to require the user to type a password on every
> boot by default; this must be opt-in.

My suggestion was not to make EVERYONE use encrypted ZFS with a
passphrase, only those who selected an encryption option within
Ubiquity.  (Perhaps my code was misunderstood as a implementation
suggestion instead of a proof of concept for developers.)  Having users
opt for encryption and password would leave ZFS in parity with other
filesystems installed within Ubiquity.  I understand the original idea
is to transparently force encryption on everyone but not bother them.
Not only is there a performance issue, but you could have some really
annoyed people if they ever needed to livecd/mount that filesystem and
discover the hidden encryption they have to figure out how to work
around.

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https://bugs.launchpad.net/bugs/1857398

Title:
  ubiquity should support encryption by default with zfsroot, with users
  able to opt in to running change-key after install

Status in ubiquity package in Ubuntu:
  New
Status in zfs-linux package in Ubuntu:
  New

Bug description:
  zfs supports built-in encryption support, but the decision of whether
  a pool is encrypted or not must be made at pool creation time; it is
  possible to add encrypted datasets on top of an unencrypted pool but
  it is not possible to do an online change of a dataset (or a whole
  pool) to toggle encryption.

  We should therefore always install with encryption enabled on zfs
  systems, with a non-secret key by default, and allow the user to use
  'zfs change-key -o keylocation=prompt' after install to take ownership
  of the encryption and upgrade the security.

  This is also the simplest way to allow users to avoid having to choose
  between the security of full-disk encryption, and the advanced
  filesystem features of zfs since it requires no additional UX work in
  ubiquity.

  We should make sure that
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1857040 is fixed
  first in the kernel so that enabling zfs encryption does not impose an
  unreasonable performance penalty.

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