Avoid symlinks in the manpage path.

* setup.py: This works around bug 1073766, what appears to be an
upstream installer issue exposed by e7b8dc61. When attempting to
idempotently create the full destination path, it will fail cryptically
on any existing symlink it finds (expecting only real directories).

Change-Id: I1e502b86854fd6ac57974b579af48cd75d3e7752

setup.py

@@ -17,6 +17,7 @@
 from setuptools import setup
 from distutils.command.install import install as du_install
 from setuptools.command.install import install
+import os.path
 
 # version comes from git-review.
 savename = __name__
@@ -34,6 +35,14 @@ class git_review_install(install):
 
 git_review_cmdclass = {'install': git_review_install}
 
+manpath = 'man'
+if os.path.realpath('/usr/local/man') == '/usr/local/share/man':
+    # This works around a bug with install where it expects every node
+    # in the relative data directory to be an actual directory, since at
+    # least Debian derivatives (and probably other platforms as well)
+    # like to symlink Unixish /usr/local/man to /usr/local/share/man.
+    manpath = os.path.join('share', manpath)
+
 setup(
     name='git-review',
     version=version,
@@ -49,6 +58,6 @@ setup(
     author_email='openstack@lists.launchpad.net',
     url='https://launchpad.net/git-review',
     scripts=['git-review'],
-    data_files=[('man/man1', ['git-review.1'])],
+    data_files=[(os.path.join(manpath, 'man1'), ['git-review.1'])],
     install_requires=['argparse'],
 )