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Re: [Fab-user] import bug

From: Jeff Forcier
Subject: Re: [Fab-user] import bug
Date: Wed, 13 May 2009 17:17:03 -0400

Hi Peter,

Assuming I read you correctly, this means the directory containing
your fabfile is already in sys.path (i.e. you've added it to your
shell PYTHONPATH or similar), and comes after the location of your
Fabric source checkout, correct? In this situation, yes, I think it
would pick up Fabric's fabfile module before yours.

For what it's worth, I use Fabric with setup.py develop, and don't
have this problem -- most likely because my fabfile's containing
directory is *not* in my normal PYTHONPATH and thus, it's being added
explicitly to the very front of the path by line ~10 in

Let me know if I was right about your scenario (and if so, I'm curious
why it's set up that way, though I'm not implying by this that you're
doing anything wrong -- literally just curious!) and we can figure out
what the best approach is.

Offhand I think I could simply tweak the behavior such that if your
situation (containing dir is already in sys.path) comes up, that dir
gets moved temporarily to index 0, just like when it has to insert it,
and is then restored to its original index afterwards.

This ought to be sufficiently clean, while ensuring that the found
fabfile module is the imported one, no matter what.


On Wed, May 13, 2009 at 4:52 PM, Peter Sheats <address@hidden> wrote:
> So in regards to this code:
> def load_fabfile(path):
>     """
>     Import given fabfile path and return dictionary of its public callables.
>     """
>     # Get directory and fabfile name
>     directory, fabfile = os.path.split(path)
>     # If the directory isn't in the PYTHONPATH, add it so our import will
> work
>     added_to_path = False
>     if directory not in sys.path:
>         sys.path.insert(0, directory)
>         added_to_path = True
>     # Perform the import (trimming off the .py)
>     imported = __import__(os.path.splitext(fabfile)[0])
>     # Remove directory from path if we added it ourselves (just to be neat)
>     if added_to_path:
>         del sys.path[0]
>     # Return dictionary of callables only (and don't include Fab operations
> or
>     # underscored callables)
>     return dict(filter(is_task, vars(imported).items()))
> What it doesn't check is what is first on the path -- so all i have been
> getting is the fab commands (build_docs, push_docs, etc) whenever i run fab
> -l even though it is finding my fabfile.py.  The reason is because my
> src/fabric command is in my path before the "directory" mentioned in the
> code above is.  So all that ever gets in the imported list is commands from
> fabric's fabfile.py.
> Maybe this is because I run python setup.py develop?  Not sure if there is
> any reason for me to have src/fabric in my path...
> Peter
> _______________________________________________
> Fab-user mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/fab-user

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