Fix UTF-8 issue with format (#380)

Author: ktf

alibuild_helpers/utilities.py

@@ -23,6 +23,8 @@ def validateSpec(spec):
     raise SpecError("Missing package field in header.")
 
 def format(s, **kwds):
+  if type(s) == bytes:
+    s = s.decode()
   return s % kwds
 
 def doDetectArch(hasOsRelease, osReleaseLines, platformTuple, platformSystem, platformProcessor):

tests/test_utilities.py

@@ -2,6 +2,7 @@
 import platform
 from alibuild_helpers.utilities import doDetectArch
 from alibuild_helpers.utilities import Hasher
+from alibuild_helpers.utilities import format
 
 UBUNTU_1510_OS_RELEASE = """
 NAME="Ubuntu"
@@ -129,6 +130,11 @@ def test_UTF8_Hasher(self):
     self.assertEqual(h3.hexdigest(), "0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33")
     self.assertNotEqual(h1.hexdigest(), h2.hexdigest())
 
+  def test_format(self):
+    self.assertEqual(format("%(foo)s", foo="foo"), "foo")
+    self.assertEqual(format(b"%(foo)s", foo="foo"), "foo")
+    self.assertRaises(KeyError, format, "%(foo)s", bar="foo")
+
 if __name__ == '__main__':
     unittest.main()