[DO NOT MERGE] Hack: Work around (maybe broken?) LocalFSAdapter

[mingwandroid]

Since kennethreitz/requests@34af72c requests no longer handles file://.

Although we have our own LocalFSAdapter, to me, it looks incomplete and doesn't seem to be working:

$ /home/ray/mc-x64-3.5/bin/conda install -c file:///home/ray/gd.cio/r-language/r-3.3.2 r-essentials

    Traceback (most recent call last):
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/exceptions.py", line 479, in conda_exception_handler
        return_value = func(*args, **kwargs)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/cli/main.py", line 145, in _main
        exit_code = args.func(args, p)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/cli/main_install.py", line 80, in execute
        install(args, parser, 'install')
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/cli/install.py", line 238, in install
        prefix=prefix)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/api.py", line 24, in get_index
        index = fetch_index(channel_urls, use_cache=use_cache, unknown=unknown)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/fetch.py", line 301, in fetch_index
        repodatas = [(u, f.result()) for u, f in zip(urls, futures)]
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/fetch.py", line 301, in <listcomp>
        repodatas = [(u, f.result()) for u, f in zip(urls, futures)]
      File "/home/ray/mc-x64-3.5/lib/python3.5/concurrent/futures/_base.py", line 398, in result
        return self.__get_result()
      File "/home/ray/mc-x64-3.5/lib/python3.5/concurrent/futures/_base.py", line 357, in __get_result
        raise self._exception
      File "/home/ray/mc-x64-3.5/lib/python3.5/concurrent/futures/thread.py", line 55, in run
        result = self.fn(*self.args, **self.kwargs)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/fetch.py", line 75, in func
        res = f(*args, **kwargs)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/conda/fetch.py", line 118, in fetch_repodata
        timeout=(6.1, 60))
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/requests/sessions.py", line 501, in get
        return self.request('GET', url, **kwargs)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/requests/sessions.py", line 488, in request
        resp = self.send(prep, **send_kwargs)
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/requests/sessions.py", line 641, in send
        r.content
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/requests/models.py", line 781, in content
        self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes()
      File "/home/ray/mc-x64-3.5/lib/python3.5/site-packages/requests/models.py", line 714, in generate
        chunk = self.raw.read(chunk_size)
    AttributeError: 'FileNotFoundError' object has no attribute 'read'

I have 'fixed' this by using a different adapter, from the requests-file project in a very hacky way. Using this, I get:

$ /home/ray/mc-x64-3.5/bin/conda install -c file:///home/ray/gd.cio/r-language/r-3.3.2 r-essentials

Fetching package metadata ...........
Solving package specifications: ..........

# All requested packages already installed.
# packages in environment at /home/ray/mc-x64-3.5:
#
r-essentials              1.5.0                         0    file:///home/ray/gd.cio/r-language/r-3.3.2

[kalefranz]

Conda's requirements information in repodata.json on defaults restrict requests to version 2.11.1 or less.

We could also cherry-pick the conda/gateways/adapters/localfs.py parts back to #3886 back to 4.2.x.

[mingwandroid]

@kalefranz, the backport sounds good to me.

[kalefranz]

superseded by #4059

[github-actions]

Hi there, thank you for your contribution to Conda!

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