clean cloud images of python2

[Scott Moser]

cloud-init is now running in python3 in the cloud images in vivid.
We'd like to remove the remaining few python2 packages.
P

From a 20150228 image, that looks like:
$ sudo apt-get remove python
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  cloud-guest-utils cloud-init landscape-client landscape-common python
  python-apt python-characteristic python-chardet python-configobj
  python-debian python-gdbm python-idna python-openssl python-pam
  python-pkg-resources python-pyasn1 python-pyasn1-modules python-pycurl
  python-serial python-service-identity python-six python-twisted-bin
  python-twisted-core python-twisted-web python-zope.interface
  update-notifier-common
0 upgraded, 0 newly installed, 26 to remove and 17 not upgraded.
After this operation, 18.1 MB disk space will be freed.
Do you want to continue? [Y/n]

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: landscape-client 14.12-0ubuntu1
ProcVersionSignature: User Name 3.18.0-13.14-generic 3.18.5
Uname: Linux 3.18.0-13-generic x86_64
ApportVersion: 2.16.1-0ubuntu2
Architecture: amd64
Date: Mon Mar 2 15:56:05 2015
Ec2AMI: ami-000001cc
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.small
Ec2Kernel: aki-00000002
Ec2Ramdisk: ari-00000002
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: landscape-client
UpgradeStatus: No upgrade log present (probably fresh install)

Related bugs:
 * Bug 1497030: [FFE] Cloud Images include landscape-client (Python2.7)

[Scott Moser (smoser)]

this should be fixed in latest upload of cloud-utils (0.27-0ubuntu13)

[Scott Moser (smoser)]

I ran this on a fresh cloud instance.
$ cat /etc/cloud/build.info
build_name: server
serial: 20150403.2

$ py2pkgs=$(dpkg -l | grep python | grep -v python3 | awk '{print $2}')
$ for p in $py2pkgs; do
  out=$(sudo apt-get remove --dry-run $p 2>&1); pkgs=$(echo "$out" | awk '$1 == "Remv" && $2 != p { print $2 }' p="$p");
   echo ${p%:*}: $pkgs; done

The things I'm confused about are:
python-idna:
python-pam:
python-serial:

I suspect these are recommends pulling those in.

[Scott Moser (smoser)]

point of reference:
$ sudo apt-get remove python
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  landscape-client landscape-common python python-apt python-characteristic
  python-chardet python-configobj python-debian python-gdbm python-idna
  python-openssl python-pam python-pkg-resources python-pyasn1
  python-pyasn1-modules python-pycurl python-serial python-service-identity
  python-six python-twisted-bin python-twisted-core python-twisted-web
  python-zope.interface update-notifier-common
0 upgraded, 0 newly installed, 24 to remove and 0 not upgraded.
After this operation, 17.0 MB disk space will be freed.
Do you want to continue? [Y/n] n

$ cat /etc/cloud/build.info
build_name: server
serial: 20150413.1

[Scott Moser (smoser)]

landscape-client removed from wily cloud-image seed.

[Scott Moser (smoser)]

took an initial stab at vim, and then was pointed at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=729924
which is debian bug to get python3 support.
just linking here.

[Scott Moser (smoser)]

marked software-properties as 'fix-released, as wily image has:
$ dpkg-query --show software-properties-common
software-properties-common 0.96.10

that depends on python3:any

[Barry Warsaw (barry)]

Just tested with Xenial server, with no additional packages installed. vim is the last thing keeping libpython2.7 on the server image. Verify with `apt-get purge python2.7 libpython2.7`

[Matthias Klose (doko)]

vim is now built for python3. added some -py2 variants for those who need them.

[Scott Moser (smoser)]

root@xenial-test:~# dpkg-query --show | libpy
libpy: command not found
root@xenial-test:~# dpkg-query --show | grep libpy
libpython3-stdlib:amd64 3.5.1-1ubuntu2
libpython3.5-minimal:amd64 3.5.1-6ubuntu1
libpython3.5-stdlib:amd64 3.5.1-6ubuntu1
root@xenial-test:~# cat /etc/cloud/build.info
build_name: server
serial: 20160223-165330

Horay. This appears fix-released. no python2 in cloud image.

[Scott Moser (smoser)]

marked landscape-client as fix-released as it is no longer in the server seed. or cloud-image seed.