2551143: Problem with installing external trackers ...

the change from distutils to setuptools moved the directories for the
templates, man pages and docs under the install directory. The install
directory is buried in the directory tree under
/usr/ib/python/.../roundup...egg/...

This patch tries to put them under:

  the directory specified by --prefix argument
  the python platform library prefix that prefixes /lib
      in sysconfig.getpath('platlib')
  the directory returned by sys.prefix.

Author: rouilj

setup.py

@@ -27,6 +27,8 @@
 
 from setuptools import setup
 
+from sysconfig import get_path
+
 import sys, os
 from glob import glob
 
@@ -49,6 +51,52 @@ def mapscript(path):
     script = module.replace('_', '-')
     return '%s = roundup.scripts.%s:run' % (script, module)
 
+def make_data_files_absolute(data_files, prefix):
+    """Using setuptools data files are put under the egg install directory
+       if the datafiles are relative paths. We don't want this. Data files
+       like man pages, documentation, templates etc. should be installed
+       in a directory outside of the install directory. So we prefix
+       all datafiles making them absolute so man pages end up in places
+       like: /usr/local/share/man, docs in /usr/local/share/doc/roundup,
+       templates in /usr/local/share/roundup/templates.
+    """
+    new_data_files = [ (os.path.join(prefix,df[0]),df[1])
+                       for df in data_files ]
+
+    return new_data_files
+
+def get_prefix():
+    """Get site specific prefix using --prefix, platform lib or
+       sys.prefix.
+    """
+    prefix_arg=False
+    prefix=""
+    for a in sys.argv:
+        if prefix_arg:
+            prefix=a
+            break
+        # is there a short form -p or something for this??
+        if a.startswith('--prefix'):
+            if a == '--prefix':
+                # next argument is prefix
+                prefix_arg=True
+                continue
+            else:
+                # strip '--prefix='
+                prefix=a[9:]
+    if prefix:
+        return prefix
+    else:
+        # get the platform lib path.
+        plp = get_path('platlib')
+        # nuke suffix that matches lib/* and return prefix
+        head, tail = os.path.split(plp)
+        while tail != 'lib' and head != '':
+            head, tail = os.path.split(head)
+        if not head:
+            head = sys.prefix
+        return head
+
 
 def main():
     # template munching
@@ -93,6 +141,8 @@ def main():
     data_files.append(include('share/doc/roundup/html/_sources', '*'))
     data_files.append(include('share/doc/roundup/html/_static', '*'))
 
+    data_files = make_data_files_absolute(data_files, get_prefix())
+
     # perform the setup action
     from roundup import __version__