Error when installing buildbot-slave in pip 7.0.0 and later

[vitaut]

I get an error when installing buildbot-slave using pip 7.0.0 - 7.1.0:

# pip install buildbot-slave
Collecting buildbot-slave
/usr/local/lib/python2.6/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading buildbot-slave-0.8.12.tar.gz (118kB)
    100% |################################| 118kB 3.3MB/s 
Collecting twisted>=8.0.0 (from buildbot-slave)
  Downloading Twisted-15.2.1.tar.bz2 (4.6MB)
    100% |################################| 4.6MB 160kB/s 
Collecting zope.interface>=3.6.0 (from twisted>=8.0.0->buildbot-slave)
  Downloading zope.interface-4.1.2.tar.gz (919kB)
    100% |################################| 921kB 792kB/s 
Requirement already satisfied (use --upgrade to upgrade): setuptools in /usr/local/lib/python2.6/dist-packages (from zope.interface>=3.6.0->twisted>=8.0.0->buildbot-slave)
Building wheels for collected packages: buildbot-slave, twisted, zope.interface
  Running setup.py bdist_wheel for buildbot-slave
  Stored in directory: //.cache/pip/wheels/34/64/c3/3efbca6046b0bbe09f8386890bf3865f3caba5ba7534e7af1f
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.6/dist-packages/pip/commands/install.py", line 293, in run
    wb.build(autobuilding=True)
  File "/usr/local/lib/python2.6/dist-packages/pip/wheel.py", line 787, in build
    build_failure.append(req)
  File "/usr/lib/python2.6/contextlib.py", line 34, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/local/lib/python2.6/dist-packages/pip/utils/logging.py", line 36, in indent_log
    yield
  File "/usr/local/lib/python2.6/dist-packages/pip/wheel.py", line 785, in build
    session=self.requirement_set.session)
  File "/usr/local/lib/python2.6/dist-packages/pip/download.py", line 814, in unpack_url
    unpack_file_url(link, location, download_dir)
  File "/usr/local/lib/python2.6/dist-packages/pip/download.py", line 723, in unpack_file_url
    unpack_file(from_path, location, content_type, link)
  File "/usr/local/lib/python2.6/dist-packages/pip/utils/__init__.py", line 644, in unpack_file
    flatten=not filename.endswith('.whl')
  File "/usr/local/lib/python2.6/dist-packages/pip/utils/__init__.py", line 528, in unzip_file
    zipfp = open(filename, 'rb')
IOError: [Errno 2] No such file or directory: '/\\\\.cache/pip/wheels/34/64/c3/3efbca6046b0bbe09f8386890bf3865f3caba5ba7534e7af1f/buildbot_slave-0.8.12-py2-none-any.whl'

The same package installs correctly with pip version 6.1.1.

[xavfernandez]

Does not look like it's related to buildbot-slave: pip seems to build a wheel successfully for it in
//.cache/pip/wheels/34/64/c3/3efbca6046b0bbe09f8386890bf3865f3caba5ba7534e7af1f but does not find it a few lines after...

Could you retry the install and check what is in the directory reported here:

Building wheels for collected packages: buildbot-slave, twisted, zope.interface
  Running setup.py bdist_wheel for buildbot-slave
  Stored in directory:  *THIS DIRECTORY*

Did you try running pip install twisted alone for example to check if it is buildbot-slave specific ?
And what is you OS ? And the content of the environment variable $HOME ? (you seem to be running as root)

For the record, pip 7.1.0 seems to install correctly buildbot-slave on my end.

[vitaut]

The directory //.cache/pip/wheels/34/64/c3/3efbca6046b0bbe09f8386890bf3865f3caba5ba7534e7af1f specified in "Stored in this directory" contains a single file buildbot_slave-0.8.12-py2-none-any.whl.

Similar error occurs when I try to install twisted:

IOError: [Errno 2] No such file or directory: '/home/\\\\.cache/pip/wheels/a0/10/c4/3b2e14dad063e87d188eb2503861413db1fea43ded77834299/zope.interface-4.1.2-cp26-none-linux_x86_64.whl'

Note that in both cases the problem is that the paths contain extra \\\\.

The error occurs on a Docker box running Ubuntu 10.04 and $HOME is set to / (not sure why, but it's a throwaway box, so I didn't care to change anything).

[xavfernandez]

Ok, for the record, that's what I'm getting:

>>> import os
>>> os.getenv("XDG_CACHE_HOME", os.path.expanduser("~/.cache"))
'//.cache'

Which is certainly transformed in pip into:

In [1]: from pip.download import path_to_url, url_to_path

In [2]: path_to_url('//.cache/path_to_some_wheel.whl')
Out[2]: 'file://.cache/path_to_some_wheel.whl'

Which unfortunately transformed back to:

In [3]: url_to_path('file://.cache/path_to_some_wheel.whl')
Out[3]: '\\\\.cache/path_to_some_wheel.whl'

In the meantime, running HOME=/root pip install buildbot-slave, seems to work.

[vitaut]

Thanks for the workaround, setting HOME to something other than / does solve the problem. It would be nice if it worked with HOME=/ too because this seems to be the default on many Docker images.