Remove unnecessary copy.deepcopy calls (#45135)

5 files changed, 36 insertions, 53 deletions

diff --git a/lib/spack/spack/cmd/config.py b/lib/spack/spack/cmd/config.py
index 36e235351b..ca68cbbd9d 100644
--- a/lib/spack/spack/cmd/config.py
+++ b/lib/spack/spack/cmd/config.py
@@ -156,7 +156,7 @@ def print_flattened_configuration(*, blame: bool) -> None:
     """
     env = ev.active_environment()
     if env is not None:
-        pristine = env.manifest.pristine_yaml_content
+        pristine = env.manifest.yaml_content
         flattened = pristine.copy()
         flattened[spack.schema.env.TOP_LEVEL_KEY] = pristine[spack.schema.env.TOP_LEVEL_KEY].copy()
     else:
diff --git a/lib/spack/spack/config.py b/lib/spack/spack/config.py
index d850a24959..100e11f0a0 100644
--- a/lib/spack/spack/config.py
+++ b/lib/spack/spack/config.py
@@ -174,9 +174,7 @@ class DirectoryConfigScope(ConfigScope):
         if data is None:
             return
 
-        # We copy data here to avoid adding defaults at write time
-        validate_data = copy.deepcopy(data)
-        validate(validate_data, SECTION_SCHEMAS[section])
+        validate(data, SECTION_SCHEMAS[section])
 
         try:
             filesystem.mkdirp(self.path)
@@ -1080,11 +1078,8 @@ def validate(
     """
     import jsonschema
 
-    # Validate a copy to avoid adding defaults
-    # This allows us to round-trip data without adding to it.
-    test_data = syaml.deepcopy(data)
     try:
-        spack.schema.Validator(schema).validate(test_data)
+        spack.schema.Validator(schema).validate(data)
     except jsonschema.ValidationError as e:
         if hasattr(e.instance, "lc"):
             line_number = e.instance.lc.line + 1
@@ -1093,7 +1088,7 @@ def validate(
         raise ConfigFormatError(e, data, filename, line_number) from e
     # return the validated data so that we can access the raw data
     # mostly relevant for environments
-    return test_data
+    return data
 
 
 def read_config_file(
diff --git a/lib/spack/spack/environment/environment.py b/lib/spack/spack/environment/environment.py
index f3df7e115a..e0002fd0ee 100644
--- a/lib/spack/spack/environment/environment.py
+++ b/lib/spack/spack/environment/environment.py
@@ -5,7 +5,6 @@
 import collections
 import collections.abc
 import contextlib
-import copy
 import os
 import pathlib
 import re
@@ -528,8 +527,8 @@ def _read_yaml(str_or_file):
         )
 
     filename = getattr(str_or_file, "name", None)
-    default_data = spack.config.validate(data, spack.schema.env.schema, filename)
-    return data, default_data
+    spack.config.validate(data, spack.schema.env.schema, filename)
+    return data
 
 
 def _write_yaml(data, str_or_file):
@@ -957,18 +956,25 @@ class Environment:
         """Get a write lock context manager for use in a `with` block."""
         return lk.WriteTransaction(self.txlock, acquire=self._re_read)
 
-    def _process_definition(self, item):
+    def _process_definition(self, entry):
         """Process a single spec definition item."""
-        entry = copy.deepcopy(item)
-        when = _eval_conditional(entry.pop("when", "True"))
-        assert len(entry) == 1
+        when_string = entry.get("when")
+        if when_string is not None:
+            when = _eval_conditional(when_string)
+            assert len([x for x in entry if x != "when"]) == 1
+        else:
+            when = True
+            assert len(entry) == 1
+
         if when:
-            name, spec_list = next(iter(entry.items()))
-            user_specs = SpecList(name, spec_list, self.spec_lists.copy())
-            if name in self.spec_lists:
-                self.spec_lists[name].extend(user_specs)
-            else:
-                self.spec_lists[name] = user_specs
+            for name, spec_list in entry.items():
+                if name == "when":
+                    continue
+                user_specs = SpecList(name, spec_list, self.spec_lists.copy())
+                if name in self.spec_lists:
+                    self.spec_lists[name].extend(user_specs)
+                else:
+                    self.spec_lists[name] = user_specs
 
     def _process_view(self, env_view: Optional[Union[bool, str, Dict]]):
         """Process view option(s), which can be boolean, string, or None.
@@ -2767,12 +2773,8 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             raise SpackEnvironmentError(msg)
 
         with self.manifest_file.open() as f:
-            raw, with_defaults_added = _read_yaml(f)
+            self.yaml_content = _read_yaml(f)
 
-        #: Pristine YAML content, without defaults being added
-        self.pristine_yaml_content = raw
-        #: YAML content with defaults added by Spack, if they're missing
-        self.yaml_content = with_defaults_added
         self.changed = False
 
     def _all_matches(self, user_spec: str) -> List[str]:
@@ -2786,7 +2788,7 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             ValueError: if no equivalent match is found
         """
         result = []
-        for yaml_spec_str in self.pristine_configuration["specs"]:
+        for yaml_spec_str in self.configuration["specs"]:
             if Spec(yaml_spec_str) == Spec(user_spec):
                 result.append(yaml_spec_str)
 
@@ -2801,7 +2803,6 @@ class EnvironmentManifestFile(collections.abc.Mapping):
         Args:
             user_spec: user spec to be appended
         """
-        self.pristine_configuration.setdefault("specs", []).append(user_spec)
         self.configuration.setdefault("specs", []).append(user_spec)
         self.changed = True
 
@@ -2816,7 +2817,6 @@ class EnvironmentManifestFile(collections.abc.Mapping):
         """
         try:
             for key in self._all_matches(user_spec):
-                self.pristine_configuration["specs"].remove(key)
                 self.configuration["specs"].remove(key)
         except ValueError as e:
             msg = f"cannot remove {user_spec} from {self}, no such spec exists"
@@ -2834,7 +2834,6 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             SpackEnvironmentError: when the user spec cannot be overridden
         """
         try:
-            self.pristine_configuration["specs"][idx] = user_spec
             self.configuration["specs"][idx] = user_spec
         except ValueError as e:
             msg = f"cannot override {user_spec} from {self}"
@@ -2847,10 +2846,10 @@ class EnvironmentManifestFile(collections.abc.Mapping):
         Args:
             include_concrete: list of already existing concrete environments to include
         """
-        self.pristine_configuration[included_concrete_name] = []
+        self.configuration[included_concrete_name] = []
 
         for env_path in include_concrete:
-            self.pristine_configuration[included_concrete_name].append(env_path)
+            self.configuration[included_concrete_name].append(env_path)
 
         self.changed = True
 
@@ -2864,14 +2863,13 @@ class EnvironmentManifestFile(collections.abc.Mapping):
         Raises:
             SpackEnvironmentError: is no valid definition exists already
         """
-        defs = self.pristine_configuration.get("definitions", [])
+        defs = self.configuration.get("definitions", [])
         msg = f"cannot add {user_spec} to the '{list_name}' definition, no valid list exists"
 
         for idx, item in self._iterate_on_definitions(defs, list_name=list_name, err_msg=msg):
             item[list_name].append(user_spec)
             break
 
-        self.configuration["definitions"][idx][list_name].append(user_spec)
         self.changed = True
 
     def remove_definition(self, user_spec: str, list_name: str) -> None:
@@ -2885,7 +2883,7 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             SpackEnvironmentError: if the user spec cannot be removed from the list,
                 or the list does not exist
         """
-        defs = self.pristine_configuration.get("definitions", [])
+        defs = self.configuration.get("definitions", [])
         msg = (
             f"cannot remove {user_spec} from the '{list_name}' definition, "
             f"no valid list exists"
@@ -2898,7 +2896,6 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             except ValueError:
                 pass
 
-        self.configuration["definitions"][idx][list_name].remove(user_spec)
         self.changed = True
 
     def override_definition(self, user_spec: str, *, override: str, list_name: str) -> None:
@@ -2913,7 +2910,7 @@ class EnvironmentManifestFile(collections.abc.Mapping):
         Raises:
             SpackEnvironmentError: if the user spec cannot be overridden
         """
-        defs = self.pristine_configuration.get("definitions", [])
+        defs = self.configuration.get("definitions", [])
         msg = f"cannot override {user_spec} with {override} in the '{list_name}' definition"
 
         for idx, item in self._iterate_on_definitions(defs, list_name=list_name, err_msg=msg):
@@ -2924,7 +2921,6 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             except ValueError:
                 pass
 
-        self.configuration["definitions"][idx][list_name][sub_index] = override
         self.changed = True
 
     def _iterate_on_definitions(self, definitions, *, list_name, err_msg):
@@ -2956,7 +2952,6 @@ class EnvironmentManifestFile(collections.abc.Mapping):
                 True the default view is used for the environment, if False there's no view.
         """
         if isinstance(view, dict):
-            self.pristine_configuration["view"][default_view_name].update(view)
             self.configuration["view"][default_view_name].update(view)
             self.changed = True
             return
@@ -2964,15 +2959,13 @@ class EnvironmentManifestFile(collections.abc.Mapping):
         if not isinstance(view, bool):
             view = str(view)
 
-        self.pristine_configuration["view"] = view
         self.configuration["view"] = view
         self.changed = True
 
     def remove_default_view(self) -> None:
         """Removes the default view from the manifest file"""
-        view_data = self.pristine_configuration.get("view")
+        view_data = self.configuration.get("view")
         if isinstance(view_data, collections.abc.Mapping):
-            self.pristine_configuration["view"].pop(default_view_name)
             self.configuration["view"].pop(default_view_name)
             self.changed = True
             return
@@ -2985,17 +2978,12 @@ class EnvironmentManifestFile(collections.abc.Mapping):
             return
 
         with fs.write_tmp_and_move(os.path.realpath(self.manifest_file)) as f:
-            _write_yaml(self.pristine_yaml_content, f)
+            _write_yaml(self.yaml_content, f)
         self.changed = False
 
     @property
-    def pristine_configuration(self):
-        """Return the dictionaries in the pristine YAML, without the top level attribute"""
-        return self.pristine_yaml_content[TOP_LEVEL_KEY]
-
-    @property
     def configuration(self):
-        """Return the dictionaries in the YAML, without the top level attribute"""
+        """Return the dictionaries in the pristine YAML, without the top level attribute"""
         return self.yaml_content[TOP_LEVEL_KEY]
 
     def __len__(self):
diff --git a/lib/spack/spack/test/cmd/config.py b/lib/spack/spack/test/cmd/config.py
index 6bc19831a5..09f6fd167d 100644
--- a/lib/spack/spack/test/cmd/config.py
+++ b/lib/spack/spack/test/cmd/config.py
@@ -640,4 +640,4 @@ spack:
         config("update", "-y", "config")
 
     with ev.Environment(str(tmpdir)) as e:
-        assert not e.manifest.pristine_yaml_content["spack"]["config"]["ccache"]
+        assert not e.manifest.yaml_content["spack"]["config"]["ccache"]
diff --git a/lib/spack/spack/test/env.py b/lib/spack/spack/test/env.py
index 61a6bc55ee..326b81a5ea 100644
--- a/lib/spack/spack/test/env.py
+++ b/lib/spack/spack/test/env.py
@@ -253,7 +253,7 @@ def test_update_default_view(init_view, update_value, tmp_path, mock_packages, c
     if isinstance(init_view, str) and update_value is True:
         expected_value = init_view
 
-    assert env.manifest.pristine_yaml_content["spack"]["view"] == expected_value
+    assert env.manifest.yaml_content["spack"]["view"] == expected_value
 
 
 @pytest.mark.parametrize(
@@ -384,7 +384,7 @@ spack:
     env.add("a")
 
     assert len(env.user_specs) == 1
-    assert env.manifest.pristine_yaml_content["spack"]["specs"] == ["a"]
+    assert env.manifest.yaml_content["spack"]["specs"] == ["a"]
 
 
 @pytest.mark.parametrize(