python-ldap package prevents python3-only build

I just installed python3-ldap on 19.10 and 18.04 and it installs fine on both.

You're right that it pulls in some python(2) packages:

$ sudo apt --no-install-recommends install python3-ldap
[sudo] password for ubuntu:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap
  python-minimal python-pyasn1 python-pyasn1-modules python2.7
  python2.7-minimal python3-pyasn1 python3-pyasn1-modules
Suggested packages:
  python-doc python-tk python2.7-doc binutils binfmt-support
The following NEW packages will be installed:
  libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap
  python-minimal python-pyasn1 python-pyasn1-modules python2.7
  python2.7-minimal python3-ldap python3-pyasn1 python3-pyasn1-modules
0 upgraded, 13 newly installed, 0 to remove and 0 not upgraded.
...

The needed packages are all in main, hence are all fully supported - as the following command shows:
apt show python libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap python-minimal python-pyasn1 python-pyasn1-modules python2.7 python2.7-minimal python3-ldap python3-pyasn1 python3-pyasn1-modules | grep 'Supported\|APT-Sources'

The situation in 19.10/Eoan (and therefore also in Focal) is different - if python3-ldap is installed there, no python2 packages are pulled-in:

$ sudo apt install python3-ldap
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  python3-pyasn1 python3-pyasn1-modules
The following NEW packages will be installed:
  python3-ldap python3-pyasn1 python3-pyasn1-modules
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.

I'm not sure what you are going to accomplish - why do you want to get rid of the python2-related packages in bionic already?
Please notice that any patched and/or recompiled packages are usually w/o support - just the one from the archives are in support.

in the python-ldap source:

override_dh_installdocs:
        dh_installdocs --link-doc=python-ldap

needs to be removed, and the symlink/directory conversion be handled. Of course, also not done in Debian

debian #905198 only handled the /u/s/doc/python-ldap-dbg symlink

as matthias has explained, there is license information that only shipped in the python2 package, but referenced from the python3 package, hence a hard dependency is there.

However, the python3-ldap package should be usuable under python3 just fine in the mean time.

You are disliking the fact that python2 is pulled in at all, right? But python3-ldap otherwise works fine under python3 for you in Bionic?

------- Comment From <email address hidden> 2019-11-12 18:01 EDT-------
> You are disliking the fact that python2 is pulled in at all, right?
RIght

> But python3-ldap otherwise works fine under python3 for you in Bionic
RIght, although to get around the hard-dependency on python-ldap (thus python2.7) we built with the Debian "stable" version of python3-ldap version 3.1.0-2 from
https://packages.debian.org/buster/python3-ldap
and verification succeeded. We cannot ship a product with this package however.

Note to SRU team:

using 0.x for disco
using 1.x for eoan

due to same version in release pockets for both of those series.

This bug was fixed in the package python-ldap - 3.2.0-3ubuntu1

---------------
python-ldap (3.2.0-3ubuntu1) focal; urgency=medium

  * Add python3-ldap.maintscript to correctly perform symlink to dir
    conversion of the previously linked docs directory on upgrades. LP:
    #1850283

 -- Dimitri John Ledkov <email address hidden> Wed, 11 Dec 2019 00:24:01 +0000

Hello bugproxy, or anyone else affected,

Accepted python-ldap into eoan-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/python-ldap/3.1.0-2ubuntu1.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-eoan to verification-done-eoan. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-eoan. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Hello bugproxy, or anyone else affected,

Accepted python-ldap into disco-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/python-ldap/3.1.0-2ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-disco to verification-done-disco. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-disco. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Hello bugproxy, or anyone else affected,

Accepted python-ldap into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/python-ldap/3.0.0-1ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

All autopkgtests for the newly accepted python-ldap (3.1.0-2ubuntu0.1) for disco have finished running.
The following regressions have been reported in tests triggered by the package:

barbican/1:8.0.0-0ubuntu1 (armhf)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/disco/update_excuses.html#python-ldap

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

All autopkgtests for the newly accepted python-ldap (3.1.0-2ubuntu1.1) for eoan have finished running.
The following regressions have been reported in tests triggered by the package:

salt/2018.3.4+dfsg1-6ubuntu1 (s390x)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/eoan/update_excuses.html#python-ldap

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

Starting at 18.04
sudo apt install python3-ldap
brings in python2

root@set-moose:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: symbolic link to python-ldap

Switch to normal upgrades, do-release-upgrade to disco, then eoan

root@set-moose:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: broken symbolic link to python-ldap

Upgrade to -proposed

# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: directory
root@set-moose:~# ls /usr/share/doc/python3-ldap
changelog.Debian.gz copyright

Now it's a directory at version i python3-ldap:amd64 3.1.0-2ubuntu1.1

For Eoan, python2 was autoremoved as part of the upgrade process (not sure if to eoan or disco).

Starting at 18.04 (for Disco verify)
sudo apt install python3-ldap
brings in python2

root@set-moose:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: symbolic link to python-ldap

#Switch to normal upgrades, do-release-upgrade to disco

root@singular-kit:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: broken symbolic link to python-ldap

Enable proposed and upgrade

root@singular-kit:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: directory
root@singular-kit:~# ls /usr/share/doc/python3-ldap
changelog.Debian.gz copyright

root@singular-kit:~# dpkg -l | grep python3-ldap
ii python3-ldap:amd64 3.1.0-2ubuntu0.1 amd64 LDAP interface module for Python3

------- Comment From <email address hidden> 2019-12-13 16:55 EDT-------
Tested Bionic s390x binary packages
python-ldap_3.0.0-1ubuntu0.1_s390x.deb in a python2 environment and
python3-ldap_3.0.0-1ubuntu0.1_s390x.deb in a python3 (only) environment.
No change, as expected, to python2 environment (success).
Successful change to the python3 environment. python2 is no longer pulled in to our python3 build by this or any other python3 package in our local repository. Completed python ldap test suite successfully in both environments. Note we do not use or build with python[3]-pyldap.

Please set tag verification-done-bionic

Thank you for the testing, marking as verification-done!

I also ran through checking the directory is changed (18.04):

root@charming-blowfish:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: symbolic link to python-ldap

Upgrade to proposed

root@charming-blowfish:~# file /usr/share/doc/python3-ldap
/usr/share/doc/python3-ldap: directory

# apt autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  libdumbnet1 libfreetype6 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap python-minimal python-pyasn1 python-pyasn1-modules python2.7 python2.7-minimal
0 upgraded, 0 newly installed, 12 to remove and 0 not upgraded.

root@charming-blowfish:~# dpkg -l | grep python3-ldap
ii python3-ldap 3.0.0-1ubuntu0.1 amd64 LDAP interface module for Python3

The verification of the Stable Release Update for python-ldap has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

This bug was fixed in the package python-ldap - 3.0.0-1ubuntu0.1

---------------
python-ldap (3.0.0-1ubuntu0.1) bionic; urgency=medium

  * Stop linking docs to python-ldap package, like it is done in later
    releases. This drops python2 dependenices from the python3
    package. LP: #1850283

 -- Dimitri John Ledkov <email address hidden> Wed, 11 Dec 2019 00:14:27 +0000

This bug was fixed in the package python-ldap - 3.1.0-2ubuntu1.1

---------------
python-ldap (3.1.0-2ubuntu1.1) eoan; urgency=medium

  * Add python3-ldap.maintscript to correctly perform symlink to dir
    conversion of the previously linked docs directory on upgrades. LP:
    #1850283

 -- Dimitri John Ledkov <email address hidden> Wed, 11 Dec 2019 00:27:51 +0000

Since Ubuntu 19.04 / Disco reached it's end-of-life on January the 23rd:
https://lists.ubuntu.com/archives/ubuntu-announce/2020-January/000253.html
the entry that marks this ticket as affecting 'Disco' is changed to 'Won't Fix'
and with that the overall project status got adjusted, too.

------- Comment From <email address hidden> 2020-01-27 09:03 EDT-------
IBM Bugzilla-> closed, Fix Released with all requested distros.