Fix false positive error in script checking license notices

Remove code block from license_check that evalutes whether a files
licenses are permissive and that there is a SPDX notice. Scancode
sometimes incorrectly attributes a single license notice to permissive
and non-permissive licenses. Removed code block results in many false
positives because it labels any file that has a "non-permissive" license
as such even when there is a permissive license.

Add function spdx_check to scancode-evaluate.py to improve analysis of
copyright and license notice tests.

tools/test/travis-ci/scancode-evaluate.py

@@ -73,17 +73,10 @@ def license_check(directory_name, file):
                 continue
             if not license_offender['file']['licenses']:
                 license_offender['reason'] = MISSING_LICENSE_TEXT
-                offenders.append(license_offender)
+                offenders.append(license_offender.copy())
                 continue
 
-            found_spdx = False
-            for i in range(len(license_offender['file']['licenses'])):
-                if license_offender['file']['licenses'][i]['category'] != 'Permissive':
-                    license_offender['reason'] = MISSING_PERMISIVE_LICENSE_TEXT
-                    offenders.append(license_offender)
-                # find SPDX, it shall be one of licenses found
-                if license_offender['file']['licenses'][i]['matched_rule']['identifier'].find("spdx") != -1:
-                    found_spdx = True
+            found_spdx = spdx_check(offenders, license_offender)
 
             if not found_spdx:
                 try:
@@ -96,7 +89,7 @@ def license_check(directory_name, file):
                     if matches:
                         continue
                     license_offender['reason'] = MISSING_SPDX_TEXT
-                    offenders.append(license_offender)
+                    offenders.append(license_offender.copy())
                 except UnicodeDecodeError:
                     # not valid file for license check
                     continue
@@ -110,6 +103,29 @@ def license_check(directory_name, file):
             userlog.warning("File: " + offender['file']['path'][len(directory_name):] + " " + "reason: " + offender['reason'])
     return len(offenders)
 
+
+def spdx_check(offenders, license_offender):
+        """ Parse through list of licenses to determine whether licenses are permissive
+                @input list of offender, individual offender dict
+                @output none
+        """
+        found_spdx = False
+        # iterate through licenses, stop once permissive license has been found
+        for i in range(len(license_offender['file']['licenses'])):
+                # is any of the licenses permissive ?
+                if license_offender['file']['licenses'][i]['category'] == 'Permissive':
+                        # confirm that it has spdx license key
+                        if license_offender['file']['licenses'][i]['matched_rule']['identifier'].find("spdx") != -1:
+                                found_spdx = True
+                        # if no spdx found return anyway
+                        return found_spdx
+        # otherwise file is missing permissive license
+        license_offender['reason'] = MISSING_PERMISIVE_LICENSE_TEXT
+        offenders.append(license_offender.copy())
+
+        # missing spdx and permissive license
+        return found_spdx
+
 def parse_args():
     parser = argparse.ArgumentParser(
         description="License check.")
@@ -119,8 +135,8 @@ def parse_args():
                         help='Directory name where are files being checked')
     return parser.parse_args()
 
-if __name__ == "__main__":
 
+if __name__ == "__main__":
     args = parse_args()
     if args.file and os.path.isfile(args.file):
         count = license_check(args.directory_name, args.file)