Glauber Costa fb742473e2 replace /usr/local as a source of packages in the python relocatable interpreter ...

I was playing with the python3 interpreter trying to get pip to work,
just to see how far we can go. We don't really need pip, but I figured
it would be a good stress test to make sure that the process is working
and robust.

And it didn't really work, because although pip will correctly install
things into $relocatable_root/local/lib, sys.path will still refer to a
hardcoded /usr/local. While this should not affect Scylla, since we
expect to have all our modules in out path anyway -- and that path is
searched before /usr/local, it is still dangerous to make an absolute
reference like this.

Unfortunately, /usr/local/ it is included unconditionally by site.py,
which is executed when the interpreter is started and there is no
environment variable I found to change that (the help string refers to
PYTHONNOUSERSITE, but I found no mention of that in site.py whatsoever)

There is a way to tell site.py not to bother to add user sites, by
passing the -s flag, which this patch does.

Aside from doing that, we also enhance PYTHONPATH to include a reference
to ./local/{lib,lib64}/python<version>/site-packages.

After applying this patch, I was able to build an interpreter containing
only python3-pip and python3-setuptools, and build the relocatable
environment from there.

Signed-off-by: Glauber Costa <glauber@scylladb.com>
Message-Id: <20190206052104.25927-1-glauber@scylladb.com>

2019-02-08 18:41:52 +02:00

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