use setuptools's --multi-version mode #530
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Reference: tahoe-lafs/trac#530
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(http://peak.telecommunity.com/DevCenter/setuptools#develop-deploy-the-project-source-in-development-mode)
This would make it so that if there is already an older version of a dependency, e.g. pyutil, present on the system and we require a newer version, that it would go ahead and install the newer version, and Tahoe would use the newer version, without requiring the user to delete the older version from her system.
This was implemented in changeset:0de6e616e0d0890d but it caused a mysterious problem on most buildbots. I think the problem might be due to an interaction with our "fake setuptools" code in our "Trial" class in source:setup.py and that the problem might be fixed by Chris Galvan's solution to #505 (wanted: a setuptools plugin to make unit tests be executed with trial instead of with pyunit). Anyway, I undid this change in changeset:1d377cc2d9871e39 in order to make the buildbots green again. By the way, this issue seems to be interfering with Francois's attempt to fix #534 ("tahoe cp" command encoding issue) since an older version of simplejson is installed system-wide on the buildslave that he is experimenting with.
Zooko mentioned, in response to #555 ("tahoe .deb cannot be installed on hardy because of simplejson dependency"), that this #530 ticket "would have meant that simplejson upgrade happened automatically".
I'm not sure I see how --multi-version would help this. We know that the tahoe .deb is not supposed to contain anything but tahoe code. What --multi-version might do is to make it easier to build tahoe from source on a host that has an older version of e.g. simplejson installed from a deb. But that seems to work anyways right now.
Oh I guess I confused #555 with the deployment issue that arose this weekend. That issue involved building from source (or, equivalently, running
easy_install allmydata-tahoe
. This ticket -- #530 -- would have made it so that deployment attempt would have automatically succeeded by automatically downloading and installing a newersimplejson
in egg or source form. Which isn't what #555 is requesting.Sigh, changeset:8148366d93c34dbe unapplies this patch, again, because setuptools doesn't create the
easy-install.pth
,setuptools.pth
, andsite.py
files when we add--multi-version
.http://bugs.python.org/setuptools/issue57 # develop doesn't create .pth files and site.py if --multi-version
Replying to zooko:
which got closed with the following comment:
Can someone translate this to English for those unfamiliar with the vagaries of Python package management? Is this just more of the same "setuptools is broken-by-design" that seems to be causing so many other problems?
See http://tahoe-lafs.org/pipermail/tahoe-dev/2010-October/005324.html
In changeset:98ffbfb31faccdaf:
After this change, a "python setup.py build" that shouldn't do anything (i.e.
do it twice and capture the output from the second run) emits 353 lines,
including 16 copies of a warning about how to use versioned dependencies in
the importing code:
I suppose that this is a benign warning, but there's too much output there
for me to tell: I first assumed that it was a fatal error.
After building it, trying to run
setup.py test
on my debian box failed(after emitting the same 353 lines of warnings):
That 0.5.17 is from the current debian/sid python-pycryptopp
.deb
package, whichincludes .egg-info data (and
pkg_resources.require("pycryptopp")
returns 0.5.17).
Does
--multi-version
break if there is a version on PYTHONPATH that wasinstalled without
--multi-version
?Running
python -c 'import pkg_resources; print pkg_resources.require("pycryptopp")'
, either from inside or outside my tahoe tree, reports:Amending that to use
"pycryptopp>=0.5.20"
results in an exception in both places:Adding support/lib/python2.6/site-packages to my
PYTHONPATH
(which is what I vaguely remember we used to do insidebin/tahoe
) doesn't change its behavior. This is the same error I'm seeing when I dosetup.py test
.I started with a
setup.py build
, so my support/lib/python2.6/site-packages directory contains:I wonder if that
-linux-x86_64
in there is causing problems.Reopening until the warnings in comment:368855 are fixed.
Maybe we don't need
--multi-version
? Now that we have a reliable test of this behavior (see the step "test-with-fake-pkg" on buildbot, or runpython misc/build_helpers/test-with-fake-pkg.py
), maybe we should try removing--multi-version
and see if that test stays green.Replying to zooko:
+1
I created [a ticket530 branch]source:ticket530 to test patches on the buildbot. Then I forced a build on all buildbots with the current ticket530 (which was unchanged from the current trunk), and now I will push a patch to remove
--multi-version
(rolling back that part of changeset:98ffbfb31faccdaf) to see if it fares better or worse than trunk.Okay I committed changeset:5f61bad92d8766e7 to the source:ticket530 branch.
Removing
--multi-version
didn't induce any regressions on buildbot. I guess I would like to add a unit test making sure that build doesn't emit certain scary warnings, which test will go from red to green when I commit changeset:5f61bad92d8766e7 to trunk...Fixed in changeset:5f61bad92d8766e7. I decided not to add a unit tests as I couldn't think of a way to check whether the output of build was too scary without "overfitting" and just checking for this particular message text.