Change 3affcaa2b8 attempts to reset
purelib & platlib to any "install-dir" specified by the user in
setup.cfg. This code is used when we are installing wheels.
The problem with this is that distutils is *always* setting
"i.install_lib" -- even when the user specifies nothing. This has the
result of unconditionally setting purelib == platlib.
On some systems this results in .so's from the wheel getting installed
into /usr/lib/python2.7 (purelib) rather than /usr/lib64/python
(platlib). Because distribution-packaged libraries have installed
their .so into platlib, we can now have a situation where the new
pip-installed library is picking up an old .so from the distro package
... with predictably bad results.
This takes the approach of checking the configuration to see if the
user has overridden install-dir and only resetting the paths if they
have. The override case is covered by existing test-cases.
Closes#2940
Fixes bug #2683
There are two changes here; one to fix the using-wheels codepath and one
to fix the no-wheels codepath. Two tests are introduced, one to test
each codepath.
* add site_config_dirs() to appdirs to determine locations across OSes
* add system_config_files to locations.py
* add system_config_files to get_config_files() and re-order files entries to correct precedence
* document changes to configuration files in user guide
Closes#309
* Deprecates the --download-cache option & removes the download
cache code.
* Removes the in memory page cache on the index
* Uses CacheControl to cache all cacheable HTTP requests to the
filesystem.
* Properly handles CacheControl headers for unconditional
caching.
* Will use ETag and Last-Modified headers to attempt to do a
conditional HTTP request to speed up cache misses and turn
them into cache hits.
* Removes some concurrency unsafe code in the download cache
accesses.
* Uses a Cache-Control request header to limit the maximum
length of time a cache is valid for.
* Adds pip.appdirs to handle platform specific application
directories such as cache, config, data, etc.
