Bug 1568771 - Output paths relative to repository in ./mach static-analysis check-coverity, r=andi

Differential Revision: https://phabricator.services.mozilla.com/D39306

--HG--
extra : moz-landing-system : lando

python/mozbuild/mozbuild/code-analysis/mach_commands.py

@@ -405,6 +405,13 @@ class StaticAnalysis(MachCommandBase):
 
     def dump_cov_artifact(self, cov_results, source, output):
         # Parse Coverity json into structured issues
+
+        def relpath(path):
+            '''Build path relative to repository root'''
+            if path.startswith(self.topsrcdir):
+                return os.path.relpath(path, self.topsrcdir)
+            return path
+
         with open(cov_results) as f:
             result = json.load(f)
 
@@ -435,7 +442,7 @@ class StaticAnalysis(MachCommandBase):
                 # Embed all events into extra message
                 for event in issue['events']:
                     dict_issue['extra']['stack'].append(
-                        {'file_path': event['strippedFilePathname'],
+                        {'file_path': relpath(event['strippedFilePathname']),
                          'line_number': event['lineNumber'],
                          'path_type': event['eventTag'],
                          'description': event['eventDescription']})
@@ -453,6 +460,7 @@ class StaticAnalysis(MachCommandBase):
                                 issue['strippedMainEventFilePathname'])
                              )
                     continue
+                path = relpath(path)
                 if path in files_list:
                     files_list[path]['warnings'].append(build_element(issue))
                 else: