[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2378: the test-from-egg buildstep has started failing on all builders

[Tahoe-LAFS]

#2378: the test-from-egg buildstep has started failing on all builders
-------------------------+-------------------------------------------------
     Reporter:  daira    |      Owner:  daira
         Type:  defect   |     Status:  assigned
     Priority:  major    |  Milestone:  1.10.1
    Component:           |    Version:  1.10.0
  packaging              |   Keywords:  buildbot test-from-egg blocks-
   Resolution:           |  release
Launchpad Bug:           |
-------------------------+-------------------------------------------------

Comment (by warner):

 Cool. I'm hesitant to change our setup.py too much right now, but after
 the release let's remove that stuff and see what happens.

 I've experimented some more, and I don't know why easy_install isn't
 putting a Twisted egg into the egginstdir. It might have to do with the
 buildslave using distribute-0.6.10 (I'm using setuptools-12.1 here and it
 installs a twisted egg when Twisted isn't already installed in /usr/lib).
 It might be that running easy_install from the source directory, where
 there's a twisted.egg sitting, might trick it into thinking that twisted
 is generally available. It might also involve an apparent bug in buildbot,
 since I see the `InstallToEgg` buildstep is using:

 {{{
 kwargs['env'] = {"PYTHONPATH": egginstalldir}
 }}}

 but easy_install sees `PYTHONPATH=egginstalldir:` (probably the result of
 a lazy join.. `egginstalldir+":"+os.environ.get("PYTHONPATH","")`). The
 extra colon (or, rather, the empty component once you `pp.split(":")`)
 causes the current directory to be added to the PYTHONPATH. And maybe it's
 somehow seeing the twisted .egg there, so not bothering to install a new
 one into the install dir.

 I'm going to try doing the install from a temporary directory, to see if
 that helps.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2378#comment:10>
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