releasetools: Sanity check the build fingerprint.

Bug: 140298338
Test: python -m unittest test_ota_from_target_files
Change-Id: I4add5f82d5b684c441b0484732da6991f8e7301a

tools/releasetools/ota_from_target_files.py

@@ -299,6 +299,9 @@ class BuildInfo(object):
           that it always uses the first dict to calculate the fingerprint or the
           device name. The rest would be used for asserting OEM properties only
           (e.g. one package can be installed on one of these devices).
+
+    Raises:
+      ValueError: On invalid inputs.
     """
     self.info_dict = info_dict
     self.oem_dicts = oem_dicts
@@ -313,6 +316,13 @@ class BuildInfo(object):
     self._device = self.GetOemProperty("ro.product.device")
     self._fingerprint = self.CalculateFingerprint()
 
+    # Sanity check the build fingerprint.
+    if (' ' in self._fingerprint or
+        any(ord(ch) > 127 for ch in self._fingerprint)):
+      raise ValueError(
+          'Invalid build fingerprint: "{}". See the requirement in Android CDD '
+          '3.2.2. Build Parameters.'.format(self._fingerprint))
+
   @property
   def is_ab(self):
     return self._is_ab

tools/releasetools/test_ota_from_target_files.py

@@ -174,6 +174,14 @@ class BuildInfoTest(test_utils.ReleaseToolsTestCase):
     self.assertRaises(AssertionError, BuildInfo,
                       self.TEST_INFO_DICT_USES_OEM_PROPS, None)
 
+  def test_init_badFingerprint(self):
+    info_dict = copy.deepcopy(self.TEST_INFO_DICT)
+    info_dict['build.prop']['ro.build.fingerprint'] = 'bad fingerprint'
+    self.assertRaises(ValueError, BuildInfo, info_dict, None)
+
+    info_dict['build.prop']['ro.build.fingerprint'] = 'bad\x80fingerprint'
+    self.assertRaises(ValueError, BuildInfo, info_dict, None)
+
   def test___getitem__(self):
     target_info = BuildInfo(self.TEST_INFO_DICT, None)
     self.assertEqual('value1', target_info['property1'])