[tahoe-dev] Fwd: Tahoe needed twisted

[zooko]

Dear AGL:

Thanks for the bug report!

What version of Ubuntu is this?

> When I tried to build Tahoe, python failed to find a module called  
> "components":
...
>
> Running Nevow-0.9.18/setup.py -q bdist_egg --dist-dir
...
> ImportError: No module named components
...
> Installing twisted (from a Ubuntu package) fixed it

Hm.  I know some of what is going on here, but I don't exactly  
understand what happened.

So, Nevow requires Twisted, but the Nevow setup.py file [1] does not  
declare that it requires Twisted in a machine-readable way so that  
our install process can know that it needs to install Twisted before  
it can install Nevow.  (As an aside, I've submitted a patch to Nevow  
to make it declare this dependency, but that patch is currently  
blocked on someone who has control over the Nevow buildbot  
configuring it to test this kind of installation: divmod ticket #2527.)

Furthermore, Nevow requires Twisted >= 2.4.0 and will give an error  
on installation if an older version of Twisted is installed .   
However, here is the part that I don't understand: this error message  
is normally:

ImportError: cannot import name versions

Why do you get a different error:

ImportError: No module named components

Oh, I need to take the boys to the Boulder Creek Fest now, so I will  
investigate more later.

It probably has something to do with which versions of Twisted and/or  
Nevow were already installed on your system when you first tried to  
build Tahoe, so please report which those were.

Thank you!

Regards,

Zooko

[1] http://divmod.org/trac/browser/trunk/Nevow/setup.py?rev=13786

tickets mentioned in this e-mail:

divmod ticket #2527: http://divmod.org/trac/ticket/2527 #  
(easy_install compatibility)