setup.py: use portage EPREFIX if available

Closes: https://bugs.gentoo.org/654128

Signed-off-by: Marty E. Plummer <hanetzer@startmail.com>

Author: hanetzer

setup.py

@@ -19,6 +19,11 @@
 _package_name = 'catalyst'
 _maintainer_name, _maintainer_email = _parseaddr(__maintainer__)
 
+# Load EPREFIX from Portage, fall back to the empty string if it fails
+try:
+	from portage.const import EPREFIX
+except ImportError:
+	EPREFIX=''
 
 def _posix_path(path):
 	"""Convert a native path to a POSIX path
@@ -48,12 +53,17 @@ def _files(prefix, root):
 		yield (install_directory, file_source_paths)
 
 
-_data_files = [('/etc/catalyst', ['etc/catalyst.conf','etc/catalystrc']),
-	('/usr/share/man/man1', ['files/catalyst.1']),
-	('/usr/share/man/man5', ['files/catalyst-config.5', 'files/catalyst-spec.5'])
+_data_files = [(_os.path.join(_os.sep, EPREFIX.lstrip(_os.sep), 'etc/catalyst'),
+	['etc/catalyst.conf','etc/catalystrc']),
+	(_os.path.join(_os.sep, EPREFIX.lstrip(_os.sep), 'usr/share/man/man1'),
+		['files/catalyst.1']),
+	(_os.path.join(_os.sep, EPREFIX.lstrip(_os.sep), 'usr/share/man/man5'),
+		['files/catalyst-config.5', 'files/catalyst-spec.5'])
 	]
-_data_files.extend(_files('share/catalyst/livecd', 'livecd'))
-_data_files.extend(_files('share/catalyst/targets', 'targets'))
+_data_files.extend(_files(_os.path.join(_os.sep, EPREFIX.lstrip(_os.sep),
+	'usr/share/catalyst/livecd'), 'livecd'))
+_data_files.extend(_files(_os.path.join(_os.sep, EPREFIX.lstrip(_os.sep),
+	'usr/share/catalyst/targets'), 'targets'))
 
 
 class set_version(_Command):