Freeze regex projects

Add a copy method to ProjectConfig objects so that we can return
a frozen ProjectConfig from the ProjectParser, but then make an
unfrozen copy so that we can change its name (and then freeze the
copy) when treating it as a regex project.

Change-Id: I2f39d9a33b9282e44daf5e9a0af3fd35e87e844e

zuul/configloader.py

@@ -930,8 +930,6 @@ class ProjectParser(object):
             # of the project where it is defined.
             project_name = (conf['_source_context'].project.canonical_name)
 
-        # regex matched projects need to be validatd later
-        regex = False
         if project_name.startswith('^'):
             # regex matching is designed to match other projects so disallow
             # in untrusted contexts
@@ -940,7 +938,6 @@ class ProjectParser(object):
 
             # Parse the project as a template since they're mostly the
             # same.
-            regex = True
             project_config = self.pcontext.project_template_parser. \
                 fromYaml(conf, validate=False, freeze=False)
 
@@ -978,9 +975,7 @@ class ProjectParser(object):
         default_branch = conf.get('default-branch', 'master')
         project_config.default_branch = default_branch
 
-        # we need to freeze regex projects later
-        if not regex:
-            project_config.freeze()
+        project_config.freeze()
         return project_config
 
 
@@ -1739,7 +1734,7 @@ class TenantParser(object):
                 for config_project in config_projects:
                     # we just override the project name here so a simple copy
                     # should be enough
-                    conf = copy.copy(config_project)
+                    conf = config_project.copy()
                     name = project.canonical_name
                     conf.name = name
                     conf.freeze()

zuul/model.py

@@ -2511,6 +2511,15 @@ class ProjectConfig(ConfigObject):
         self.pipelines = {}
         self.branch_matcher = None
 
+    def copy(self):
+        r = self.__class__(self.name)
+        r.source_context = self.source_context
+        r.start_mark = self.start_mark
+        r.templates = self.templates
+        r.pipelines = self.pipelines
+        r.branch_matcher = self.branch_matcher
+        return r
+
     def addImpliedBranchMatcher(self, branch):
         self.branch_matcher = change_matcher.ImpliedBranchMatcher(branch)