Follow redirects with curl at ez_setup.py

[juliogonzalez]

This PR fixes the setup, as some python modules such as setuptools are now a redirect.

For example:

https://pypi.python.org/packages/source/s/setuptools/setuptools-4.0.1.zip is now a 301 redirect to https://pypi.org/packages/source/s/setuptools/setuptools-4.0.1.zip

Current ez_setup.py implementation downloads https://pypi.python.org/packages/source/s/setuptools/setuptools-4.0.1.zip which is now a HTML file, and then crashes:

pi@raspberrypi:~/Adafruit_Python_DHT $ python setup.py install
Downloading https://pypi.python.org/packages/source/s/setuptools/setuptools-4.0.1.zip
Extracting in /tmp/tmp6NJujO
Traceback (most recent call last):
  File "setup.py", line 4, in <module>
    use_setuptools()
  File "/home/pi/Adafruit_Python_DHT/ez_setup.py", line 140, in use_setuptools
    return _do_download(version, download_base, to_dir, download_delay)
  File "/home/pi/Adafruit_Python_DHT/ez_setup.py", line 120, in _do_download
    _build_egg(egg, archive, to_dir)
  File "/home/pi/Adafruit_Python_DHT/ez_setup.py", line 62, in _build_egg
    with archive_context(archive_filename):
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "/home/pi/Adafruit_Python_DHT/ez_setup.py", line 100, in archive_context
    with ContextualZipFile(filename) as archive:
  File "/home/pi/Adafruit_Python_DHT/ez_setup.py", line 88, in __new__
    return zipfile.ZipFile(*args, **kwargs)
  File "/usr/lib/python2.7/zipfile.py", line 770, in __init__
    self._RealGetContents()
  File "/usr/lib/python2.7/zipfile.py", line 813, in _RealGetContents
    raise BadZipfile, "File is not a zip file"
zipfile.BadZipfile: File is not a zip file

After this patch:

pi@raspberrypi:~/Adafruit_Python_DHT $ python setup.py install
Downloading https://pypi.python.org/packages/source/s/setuptools/setuptools-4.0.1.zip
Extracting in /tmp/tmp7HyCt4
Now working in /tmp/tmp7HyCt4/setuptools-4.0.1
Building a Setuptools egg in /home/pi/Adafruit_Python_DHT
/home/pi/Adafruit_Python_DHT/setuptools-4.0.1-py2.7.egg
running install
[....]

This PR should fix #96, fix #91 and maybe #92

[mueller-ma]

Thanks

[juliogonzalez]

@mueller-ma, you are welcome!

I guess a merge is still needed :-)

[andrejguran]

confirming that this fix work 👍

[juliogonzalez]

@mueller-ma is there anything else required from my side to get this merged?

[mueller-ma]

@juliogonzalez I'm not affiliated with Adafruit, I just gave my approval here as your commit fixed the issue I had.

[juliogonzalez]

@mueller-ma, ok, sorry. Since you were able to make a review and approve the PR, I assumed you could merge as well.

Let's ping @ladyada and @tdicola as I see they merged the latest PRs.

[brennen]

Thanks for this - I think we'll probably just dispense with ez_setup.py altogether, in #101 (a sanity check there would be welcome), but I'll leave this open 'til that merges just in case.

[juliogonzalez]

@brennen #101 makes all the sense to me. I will check it with my raspbian + DHT22 both installing from pypi and compilig from the repository, and will leave feedback there.

Feel free to close this PR, unless you think #101 will take a lot of time to be merged (in that case it would make sense merging this fix temporary until #101 is ready).