+ return t.branch.revno()
+
+
+def get_version_from_pkg_info():
+ """Get the version from PKG-INFO file if we can."""
+ pkg_info_path = os.path.join(os.path.dirname(__file__), 'PKG-INFO')
+ try:
+ pkg_info_file = open(pkg_info_path, 'r')
+ except (IOError, OSError):
+ return None
+ try:
+ pkg_info = email.message_from_file(pkg_info_file)
+ except email.MessageError:
+ return None
+ return pkg_info.get('Version', None)
+
+
+def get_version():
+ """Return the version of testtools that we are building."""
+ version = '.'.join(
+ str(component) for component in testtools.__version__[0:3])
+ phase = testtools.__version__[3]
+ if phase == 'final':
+ return version
+ pkg_info_version = get_version_from_pkg_info()
+ if pkg_info_version:
+ return pkg_info_version
+ revno = get_revno()