Fix errors from validate_target_files

We should skip lines that don't contain '=', e.g. empty lines.
Also, pop a warning instead of an error if a prop is defined
multiple times with the same value

Bug: 177240467
Test: unittest, run validate_target_files
Change-Id: Ifc9eadb91e5dda7170a19d875016e5a47e8fc592

tools/releasetools/test_validate_target_files.py

@@ -357,9 +357,6 @@ class ValidateTargetFilesTest(test_utils.ReleaseToolsTestCase):
         'google/coral/coral:10/RP1A.200325.001/6337676:user/dev-keys',
         'ro.product.odm.device=coral',
     ]
-    input_tmp = ValidateTargetFilesTest.make_build_prop({
-        'ODM/etc/build.prop': '\n'.join(build_prop),
-    })
+    input_tmp = ValidateTargetFilesTest.make_build_prop(build_prop)
 
-    self.assertRaises(ValueError, CheckBuildPropDuplicity,
-                        input_tmp)
+    self.assertRaises(ValueError, CheckBuildPropDuplicity, input_tmp)

tools/releasetools/validate_target_files.py

@@ -236,6 +236,7 @@ def ValidateInstallRecoveryScript(input_tmp, info_dict):
 
   logging.info('Done checking %s', script_path)
 
+
 # Symlink files in `src` to `dst`, if the files do not
 # already exists in `dst` directory.
 def symlinkIfNotExists(src, dst):
@@ -246,6 +247,7 @@ def symlinkIfNotExists(src, dst):
       continue
     os.symlink(os.path.join(src, filename), os.path.join(dst, filename))
 
+
 def ValidateVerifiedBootImages(input_tmp, info_dict, options):
   """Validates the Verified Boot related images.
 
@@ -423,16 +425,25 @@ def ValidateVerifiedBootImages(input_tmp, info_dict, options):
           'Verified %s with avbtool (key: %s):\n%s', image, key,
           stdoutdata.rstrip())
 
-def CheckDataDuplicity(lines):
+
+def CheckDataInconsistency(lines):
     build_prop = {}
     for line in lines:
       if line.startswith("import") or line.startswith("#"):
         continue
-      key, value = line.split("=", 1)
+      if "=" not in line:
+        continue
+
+      key, value = line.rstrip().split("=", 1)
       if key in build_prop:
-        return key
+        logging.info("Duplicated key found for {}".format(key))
+        if value != build_prop[key]:
+          logging.error("Key {} is defined twice with different values {} vs {}"
+                        .format(key, value, build_prop[key]))
+          return key
       build_prop[key] = value
 
+
 def CheckBuildPropDuplicity(input_tmp):
   """Check all buld.prop files inside directory input_tmp, raise error
   if they contain duplicates"""
@@ -448,9 +459,11 @@ def CheckBuildPropDuplicity(input_tmp):
         continue
       logging.info("Checking {}".format(path))
       with open(path, 'r') as fp:
-        dupKey = CheckDataDuplicity(fp.readlines())
+        dupKey = CheckDataInconsistency(fp.readlines())
         if dupKey:
-          raise ValueError("{} contains duplicate keys for {}", path, dupKey)
+          raise ValueError("{} contains duplicate keys for {}".format(
+              path, dupKey))
+
 
 def main():
   parser = argparse.ArgumentParser(