Merge lp:~allenap/launchpad/packages-for-autoload-bug-443061 into lp:launchpad

Import autoland as late as possible, and show an explanatory message if it fails.

Max Bowsher said "The problem with recommending that people install the system package of lazr.uri is that it breaks launchpad dev". I asked him later to elaborate:

<maxb> So the problem is that setuptools installs a *-nspkg.pth file
  which registers the toplevel lazr package with a __path__ pointing
  to the system directory
<maxb> This defeats attempts to add any other lazr.* via PYTHONPATH
<maxb> And then you have a bit of a conundrum. I haven't figured out
  how to solve it, or if it is soluble
<allenap> maxb: Ah, that's grizzly. If it's installed via a deb then
  this won't be a problem, will it? Not that there's a lazr.uri deb
  easily available.
<maxb> Yes, it is a problem, and there's lazr.something debs available
  in karmic, hence me noticing the problem
<maxb> python-lazr-uri | 1.0-0ubuntu1 | karmic | all

I changed the warning message to recommend against any system-wide
installation of these packages, rather than just pointing the finger
at setuptools.

Thanks for fixing this, Gavin.

I have a branch that makes this warning unnecessary. The necessary eggs are not yet in the download-cache branch, but this is the branch: lp:~gary/launchpad/buildout-py .

This change shouldn't harm anything, but the warning should become unnecessary after my branch lands.

Gary

On Tue, 06 Oct 2009 18:32:40 -0000
Gary Poster <email address hidden> wrote:

> I have a branch that makes this warning unnecessary. The necessary
> eggs are not yet in the download-cache branch, but this is the
> branch: lp:~gary/launchpad/buildout-py .

Part of the problem is that utilities/ec2 needs to run with Python
2.5+ because of boto. I tried getting it to run with the buildout
managed bin/py but with no luck; boto wanted hashlib and even when I
got buildout to install that too, it expected a different calling
convention for... something else, can't remember what.

I don't think the branch above addresses that, or does it? I feel
like I'm missing some crucial detail :)

Gavin.