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[Bug 1818518] [NEW] FFe: samba 4.10.0

Public bug reported:

Samba 4.10.0[1] is the first samba release to completely support
python3. It is a goal of Ubuntu to remove python from the desktop images
(see bug #1440381), and this release of samba, together with the
mandatory dependency updates it warrants (ldb, tdb, talloc and tevent),
allow for that to happen.

tdb FFe: https://bugs.launchpad.net/ubuntu/+source/tdb/+bug/1818520

Samba 4.10.0 is not yet released, though. The current release is
4.10.0rc3, with an RC4 expected by tomorrow (March 5th, 2019). The final
release is expected for March 19th, 2019 (see [1]).

Release notes for the 4.10 branch are at [2]

Considerations:
- We are going ahead of Debian with this change
- python2 bindings will be dropped from the samba package, in favor of py3 only ones. It is possible to build with both, but the current packaging would have to be changed because, among other things, samba-libs has python dependencies. We would need to move those to another package otherwise samba-libs would depend on both python2 and python3, which defeats the purpose of what we want
- new python3-* packages will result from this effort: python3-samba, python3-ldb, python3-talloc
- this is the first release of samba that supports python3. Bugs can be expected
- samba "dot-zero" (.0) releases might contain bugs that are quickly fixed in point releases. We might have to do such updates before Disco releases.
- samba 4.10.x is the last series of samba that will support python2

We believe there is greater risk in postponing this change for disco+1
than doing it now, and flushing out the bugs in preparation for the next
LTS.

FFe bugs for the samba 4.10 dependencies will be filed as well (talloc,
tdb, tevent and ldb).

Ongoing work for this update is being tracked in
https://trello.com/c/roVc4bsZ

Branches:
ldb: https://code.launchpad.net/~ahasenack/ubuntu/+source/ldb/+git/ldb/+ref/disco-ldb-1.5.4
tevent: https://code.launchpad.net/~ahasenack/ubuntu/+source/tevent/+git/tevent/+ref/disco-tevent-0.9.39
talloc: https://code.launchpad.net/~ahasenack/ubuntu/+source/talloc/+git/talloc/+ref/disco-talloc-2.1.16
tdb: https://code.launchpad.net/~ahasenack/ubuntu/+source/tdb/+git/tdb/+ref/disco-tdb-1.3.18
samba: https://code.launchpad.net/~ahasenack/ubuntu/+source/samba/+git/samba/+ref/disco-samba-4.10

PPA with test builds:
https://launchpad.net/~ahasenack/+archive/ubuntu/samba-4.10/

A bileto ticket is being prepared too.

1. https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.10
2. https://gitlab.com/samba-team/samba/blob/v4-10-test/WHATSNEW.txt

** Affects: samba (Ubuntu)
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/1818518

Title:
FFe: samba 4.10.0

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