[Bug 1328958] Re: Local provider assumes a local "ubuntu" user exists

[Robie Basak]

I have reproduced the issue again on a fresh Trusty cloud image. It
reproduces reliably just by removing the ubuntu user first. Exact
reproduction steps below.

> Juju requires the machines it provisions to have an ubuntu user.

That's fine, but Juju must not assume that the local user has an ubuntu
user to start with, when bootstrap a local provider environment. Juju is
expected to run on an Ubuntu desktop machine. Ubuntu desktop machines do
not typically have an ubuntu user.

So, to test this common case in an easily reproducible environment, I
start by removing the ubuntu user, to bring a cloud image environment
closer to that of a desktop user environment.

I first came across this bug on my laptop, which has never been a cloud
environment and has never had an ubuntu user. Apparently Juju has the
"ubuntu" user hardcoded somewhere in a code path that runs locally,
which is a false assumption.

Exact steps to reproduce on a Trusty cloud image:

ubuntu at foo:~$ cat /etc/cloud/build.info 
build_name: server
serial: 20140607.1

sudo -i

apt-get update && sudo apt-get -y dist-upgrade
reboot

sudo -i
adduser --disabled-password --gecos foo foo
cp -a ~ubuntu/.ssh ~foo/
chown -R foo. ~foo/.ssh
echo 'foo ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/foo

logout

# Log  back in as foo here

sudo deluser ubuntu

sudo add-apt-repository -y ppa:juju/stable
sudo apt-get update
sudo apt-get -y install juju-core juju-local

apt-cache policy juju-core juju-local
juju-core:
  Installed: 1.18.4-0ubuntu1~14.04.1~juju1
  Candidate: 1.18.4-0ubuntu1~14.04.1~juju1
  Version table:
 *** 1.18.4-0ubuntu1~14.04.1~juju1 0
        500 http://ppa.launchpad.net/juju/stable/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
     1.18.1-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
juju-local:
  Installed: 1.18.4-0ubuntu1~14.04.1~juju1
  Candidate: 1.18.4-0ubuntu1~14.04.1~juju1
  Version table:
 *** 1.18.4-0ubuntu1~14.04.1~juju1 0
        500 http://ppa.launchpad.net/juju/stable/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
     1.18.1-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages

foo at foo:~$ getent passwd ubuntu
foo at foo:~$ getent passwd foo
foo:x:1001:1001:foo,,,:/home/foo:/bin/bash
foo at foo:~$ echo $USER
foo

juju generate-config
juju switch local
juju bootstrap --series trusty --upload-tools

Actual results:

uploading tools for series [trusty]
Logging to /home/foo/.juju/local/cloud-init-output.log on remote host
chown: invalid user: ‘ubuntu:ubuntu’
Bootstrap failed, destroying environment
ERROR exit status 1

Expected results: successful local environment bootstrap.

** Changed in: juju-core
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1328958

Title:
  Local provider assumes a local "ubuntu" user exists

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