allow packaging python projects using +g as separator with the git commit number

.g is forbidden when following PEP0440 versionning standard.

eobuilder/changelog.py

@@ -2,6 +2,7 @@ import datetime
 import textwrap
 import os
 import sys
+import subprocess
 
 import pytz
 
@@ -16,11 +17,27 @@ def get_commit_from_tag(repo, tag_ref):
     assert ref.object.type == 'commit'
     return ref.object
 
+
+def is_pep0440_project(path):
+    if not os.path.exists(os.path.join(path, 'setup.py')):
+        return False
+    curdir = os.getcwd()
+    try:
+        os.chdir(path)
+        output = subprocess.check_output('python setup.py --version', shell=True)
+        if '+' in output:
+            return True
+    finally:
+        os.chdir(curdir)
+    return False
+
+
 def changelog_from_git(project, version_suffix, path,
         repository='eobuilder',
         maintainer_name='eobuilder',
         maintainer_email='eobuilder@entrouvert.com'):
     repo = git.repo.Repo(path)
+    is_pep0440 = is_pep0440_project(path)
 
     versions = []
 
@@ -51,6 +68,9 @@ def changelog_from_git(project, version_suffix, path,
         if not logs:
             continue
         version = name.lstrip('v').replace('-', '.')
+        if is_pep0440_project:
+            # pep440 limit free-style version number after a +
+            version = version.replace('.g', '+g')
         if i == 0:
             version += version_suffix
         yield '%s (%s) %s; urgency=low' % (project, str(version), repository)