pip install always reinstalls

[axos88]

Hello,

Pip install always reinstalls carbon instead of reporting it as being at the latest version (as with other packages)
This slows down our deploys considerably.

Affected OSes

Multiple linux distros were tried, debian, ubuntu, I don't think it's tied to any OS.

Way to reproduce:

Run pip install carbon twice

Expected:

Second run to return with requirement already satisfied, as with whisper:

vagrant@meter0:~$ pip install whisper
Requirement already satisfied (use --upgrade to upgrade): whisper in /usr/local/lib/python2.7/dist-packages
Cleaning up...

Actual:

A full install is run:

Downloading/unpacking carbon
  Running setup.py egg_info for package carbon

    package init file 'lib/twisted/plugins/__init__.py' not found (or not a regular file)
    warning: no files found matching '*' under directory 'conf/'
    warning: no files found matching '*' under directory 'distro/'
    warning: no previously-included files found matching 'conf/*.conf'
Requirement already satisfied (use --upgrade to upgrade): twisted in /usr/local/lib/python2.7/dist-packages (from carbon)
Requirement already satisfied (use --upgrade to upgrade): txamqp in /usr/local/lib/python2.7/dist-packages (from carbon)
Requirement already satisfied (use --upgrade to upgrade): zope.interface>=3.6.0 in /usr/local/lib/python2.7/dist-packages (from twisted->carbon)
Requirement already satisfied (use --upgrade to upgrade): setuptools in /usr/local/lib/python2.7/dist-packages (from zope.interface>=3.6.0->twisted->carbon)
Installing collected packages: carbon
  Running setup.py install for carbon
    package init file 'lib/twisted/plugins/__init__.py' not found (or not a regular file)

    warning: no files found matching '*' under directory 'conf/'
    warning: no files found matching '*' under directory 'distro/'
    warning: no previously-included files found matching 'conf/*.conf'
    changing mode of /opt/graphite/bin/carbon-cache.py to 755
    changing mode of /opt/graphite/bin/carbon-client.py to 755
    changing mode of /opt/graphite/bin/carbon-relay.py to 755
    changing mode of /opt/graphite/bin/validate-storage-schemas.py to 755
    changing mode of /opt/graphite/bin/carbon-aggregator.py to 755
Successfully installed carbon
Cleaning up...

[thorrsson]

I think this can be fixed by adding a py_modules declaration in the setup.py setup()

[thorrsson]

nope, it didn't make a difference

[obfuscurity]

This appears to be a duplicate of #86. There's a lot more detail over there, closing this one.