build broken for DIB_RELEASE=xenial element ubuntu

[Saverio Proto]

Steps to reproduce:

cd /home/ubuntu
git clone https://github.com/openstack/dib-utils
git clone https://github.com/openstack/diskimage-builder
export PATH=$PATH:/home/ubuntu/diskimage-builder/bin:/home/ubuntu/dib-utils/bin
export DIB_RELEASE=xenial
disk-image-create -a amd64 -t raw -o xenial.raw ubuntu vm

This fails with:
dib-run-parts Sun May 1 07:13:47 UTC 2016 Running /tmp/in_target.d/install.d/00-baseline-environment
/usr/bin/env: 'python': No such file or directory
bin/pkg-map error.
Unmount /tmp/image.bxyov8cQ/mnt/var/cache/apt/archives
Unmount /tmp/image.bxyov8cQ/mnt/tmp/in_target.d
Unmount /tmp/image.bxyov8cQ/mnt/tmp/ccache
Unmount /tmp/image.bxyov8cQ/mnt/sys
Unmount /tmp/image.bxyov8cQ/mnt/proc
Unmount /tmp/image.bxyov8cQ/mnt/dev/pts
Unmount /tmp/image.bxyov8cQ/mnt/dev

-------
please note that with the same steps but export DIB_RELEASE=trusty, everything works as expected

[Simon Leinen (simon-leinen)]

The Xenial base images no longer have the Python 2.x packages installed by default, see:

https://wiki.ubuntu.com/XenialXerus/ReleaseNotes#Python_3

I could see a few possible ways to address this: Either disk-image-builder learns how to use Python 3 where available, or it installs the Python 2.x package ("python") on Xenial and later Ubuntu releases.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/311634

[Aleksey Zvyagintsev (azvyagintsev)]

Hello, any ETA?

[Clint Byrum (clint-fewbar)]

Hi everybody. Sorry this is taking a long time. I'd say we should aim to set the -default- Ubuntu release to Xenial by the time 16.04.1 is released, which is July 21st 2016, according to https://wiki.ubuntu.com/XenialXerus/ReleaseSchedule

Given that, we will probably want it working for a while prior to that. The answer though, isn't to install python2 again, but rather to get dib working with python3.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Simon Leinen (<email address hidden>) on branch: master
Review: https://review.openstack.org/311634
Reason: Abandoned in favor of https://review.openstack.org/326228 - please review there. Thanks all for your help!

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/326228
Committed: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=b9fdc70e32114fd05374ee793ad31b50c96ec1dc
Submitter: Jenkins
Branch: master

commit b9fdc70e32114fd05374ee793ad31b50c96ec1dc
Author: Ian Wienand <email address hidden>
Date: Tue Jun 7 15:00:00 2016 +1000

    Move pkg-map to dib-python

    The latest Fedora/Ubuntu images don't ship python2 by default, so we
    need to use our dib-python wrapper for this so we work in python3 only
    environments.

    Closes-bug: 1577105
    Change-Id: I1048ceef35f269960216066924986eec6117ca00

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/664240

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/664240
Committed: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=ea9ab89829fe8db6f89ef002dc9223a9e1d52186
Submitter: Zuul
Branch: master

commit ea9ab89829fe8db6f89ef002dc9223a9e1d52186
Author: Maksim Malchuk <email address hidden>
Date: Fri Apr 5 09:47:40 2019 +0300

    Move pypi to dib-python

    The latest Fedora/Ubuntu images don't ship python2 by default, so we
    need to use our dib-python wrapper for this so we work in python3 only
    environments.

    This change also correctly creates the pip.conf and .pydistutils.cfg
    files with trusted host extracted from the index-url.

    Related-bug: 1577105

    Change-Id: Ibb5348af3e3bbe46b19affe90a8930a4b4ad4cad
    Signed-off-by: Maksim Malchuk <email address hidden>