Thanks Didier, looks great :)

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  FFe: create zfs dataset for each user automatically

Status in shadow package in Ubuntu:
Status in zsys package in Ubuntu:

Bug description:
  Part of the zsys spec is creating/associating one user dataset for
  each HOME user.

  As zsys is an official experimentation for 19.10, we would like to
  include this feature in a safe way, and reachable for any tool
  creating users (adduser, gnome-control-center, ubiquity…). Those are
  using useradd under the scene.

  For this, the proposed implementation:
  - patch useradd trying to execute "zsys useradd create USER HOMEDIR". If zsys 
isn't present or zsys returns a status code != 0 (which will be the case if the 
running system isn't a zsys one: pure zfs or non zfs like / on ext4), it will 
fallback to mkdir. Then the code does the usual chmod()
  - patch usermod, trying as well to execute "zsys useradd rename-home OLDHOME 
NEWHOME". Same failing reason (not a zsys system, not installed, OLDHOME isn't 
a zsys handled datasets) and fallback to rename(). Then the code does the usual 

  Tested with and without zsys installed, the code does what we expect.

  I'm attaching the shadow (useradd/usermod) patches, as you can see it's very 
  A new ZSYS release will be needed ( As you 
can see, there are quite some commits since the last release, but it's all 
baked (as usual) by a huge suite of tests (in ZFS and machine layers) with 
corner cases tested and such. I'm confident on that change.

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