Added custom package orderer and fixed package orderer sort logic

src/rez/cli/config.py

@@ -30,7 +30,7 @@ def setup_parser(parser, completions=False):
 
 def command(opts, parser, extra_arg_groups=None):
     from rez.config import config
-    from rez.utils.yaml import dump_yaml
+    from rez.utils.yaml import dump_yaml, YamlDumpable
     from rez.utils.data_utils import convert_json_safe
 
     if opts.search_list:
@@ -54,7 +54,7 @@ def command(opts, parser, extra_arg_groups=None):
             except KeyError:
                 raise ValueError("no such setting: %r" % opts.FIELD)
 
-    if isinstance(data, (dict, list)):
+    if isinstance(data, (dict, list, YamlDumpable)):
         if opts.json:
             txt = json.dumps(convert_json_safe(data))
         else:

src/rez/config.py

@@ -83,9 +83,8 @@ def _validate(self, data):
         if self.key in self.config.overrides:
             return data
 
-        if not self.config.locked:
-
-            # next, env-var
+        # next, env-var
+        if self._env_var_name and not self.config.locked:
             value = os.getenv(self._env_var_name)
             if value is not None:
                 if self.key in _deprecated_settings:
@@ -361,6 +360,19 @@ def _parse_env_var(self, value):
             return value
 
 
+class PackageOrderers(Setting):
+    @cached_class_property
+    def schema(cls):
+        from rez.package_order import from_pod, OrdererDict
+        return Or(
+            Schema(And(
+                [Use(from_pod)],
+                Use(OrdererDict)
+            )), None)
+
+    _env_var_name = None
+
+
 config_schema = Schema({
     "packages_path":                                PathList,
     "plugin_path":                                  PathList,
@@ -496,7 +508,7 @@ def _parse_env_var(self, value):
     "env_var_separators":                           Dict,
     "variant_select_mode":                          VariantSelectMode_,
     "package_filter":                               OptionalDictOrDictList,
-    "package_orderers":                             OptionalDictOrDictList,
+    "package_orderers":                             PackageOrderers,
     "new_session_popen_args":                       OptionalDict,
     "context_tracking_amqp":                        OptionalDict,
     "context_tracking_extra_fields":                OptionalDict,

src/rez/data/tests/solver/packages/pyvariants/2/package.py

@@ -1,4 +1,9 @@
 name = "pyvariants"
 version = "2"
 
-variants = [["python-2.7.0"], ["python-2.6.8", "nada"]]
+variants = [
+    ["python-2.7.0"],
+    ["python-2.6.8", "nada"],
+    ["python-2.6.8"],
+    ["nada"],
+]

src/rez/data/tests/solver/packages/reorderable.py

@@ -0,0 +1,31 @@
+name = 'reorderable'
+
+versions = [
+        "3.1.1",
+        "3.0.0",
+        "2.2.1",
+        "2.2.0",
+        "2.1.5",
+        "2.1.1",
+        "2.1.0",
+        "2.0.6",
+        "2.0.5",
+        "2.0.0",
+        "1.9.1",
+        "1.9.0",
+]
+
+# Note - we've intentionally left out timestamps for 2.2.0 and 1.9.1 to
+# make sure the system still works
+version_overrides = {
+    "3.1.1": {"timestamp": 1470728488},
+    "3.0.0": {"timestamp": 1470728486},
+    "2.1.5": {"timestamp": 1470728484},
+    "2.2.1": {"timestamp": 1470728482},
+    "2.1.1": {"timestamp": 1470728480},
+    "2.1.0": {"timestamp": 1470728478},
+    "2.0.6": {"timestamp": 1470728476},
+    "2.0.5": {"timestamp": 1470728474},
+    "2.0.0": {"timestamp": 1470728472},
+    "1.9.0": {"timestamp": 1470728470},
+}