add username's option

test/test_option_username.py

@@ -0,0 +1,25 @@
+"configuration objects global API"
+import autopath
+from py.test import raises
+
+from tiramisu.config import Config
+from tiramisu.option import UsernameOption
+
+def test_username():
+    UsernameOption('a', '', 'string')
+    UsernameOption('a', '', '_string')
+    UsernameOption('a', '', 's_tring')
+    UsernameOption('a', '', 'string_')
+    UsernameOption('a', '', 'string$')
+    UsernameOption('a', '', '_string$')
+    raises(ValueError, "UsernameOption('a', '', 'strin$g')")
+    UsernameOption('a', '', 's-tring')
+    raises(ValueError, "UsernameOption('a', '', '-string')")
+    UsernameOption('a', '', 's9tring')
+    raises(ValueError, "UsernameOption('a', '', '9string')")
+    raises(ValueError, "UsernameOption('a', '', '')")
+    UsernameOption('a', '', 's')
+    UsernameOption('a', '', 's2345678901234567890123456789012')
+    raises(ValueError, "UsernameOption('a', '', 's23456789012345678901234567890123')")
+    UsernameOption('a', '', 's234567890123456789012345678901$')
+    raises(ValueError, "UsernameOption('a', '', 's2345678901234567890123456789012$')")

tiramisu/option.py

@@ -1079,6 +1079,18 @@ class URLOption(DomainnameOption):
             raise ValueError(_('invalid url, should ends with filename'))
 
 
+class UsernameOption(Option):
+    __slots__ = tuple()
+    _opt_type = 'username'
+    #regexp build with 'man 8 adduser' informations
+    username_re = re.compile(r"^[a-z_][a-z0-9_-]{0,30}[$a-z0-9_-]{0,1}$")
+
+    def _validate(self, value):
+        match = self.username_re.search(value)
+        if not match:
+            raise ValueError(_('invalid username'))
+
+
 class FilenameOption(Option):
     __slots__ = tuple()
     _opt_type = 'file'