config: report file:line of deprecated config items

lib/spack/spack/config.py

@@ -34,8 +34,11 @@
 import os
 import re
 import sys
+import warnings
 from typing import Any, Callable, Dict, Generator, List, Optional, Tuple, Union
 
+import jsonschema
+
 from llnl.util import filesystem, lang, tty
 
 import spack.error
@@ -1048,7 +1051,6 @@ def validate(
     This leverages the line information (start_mark, end_mark) stored
     on Spack YAML structures.
     """
-    import jsonschema
 
     try:
         spack.schema.Validator(schema).validate(data)
@@ -1057,7 +1059,12 @@ def validate(
             line_number = e.instance.lc.line + 1
         else:
             line_number = None
-        raise ConfigFormatError(e, data, filename, line_number) from e
+        exception = ConfigFormatError(e, data, filename, line_number)
+
+        if isinstance(e, spack.schema.NonFatalValidationError):
+            warnings.warn(str(exception))
+        else:
+            raise exception from e
     # return the validated data so that we can access the raw data
     # mostly relevant for environments
     return data

lib/spack/spack/container/__init__.py

@@ -6,6 +6,8 @@
 """
 import warnings
 
+import jsonschema
+
 import spack.environment as ev
 import spack.schema.env as env
 import spack.util.spack_yaml as syaml
@@ -30,7 +32,6 @@ def validate(configuration_file):
     Returns:
         A sanitized copy of the configuration stored in the input file
     """
-    import jsonschema
 
     with open(configuration_file, encoding="utf-8") as f:
         config = syaml.load(f)

lib/spack/spack/schema/__init__.py

@@ -4,7 +4,8 @@
 """This module contains jsonschema files for all of Spack's YAML formats."""
 import copy
 import typing
-import warnings
+
+import jsonschema
 
 import llnl.util.lang
 
@@ -16,14 +17,14 @@ class DeprecationMessage(typing.NamedTuple):
     error: bool
 
 
-# jsonschema is imported lazily as it is heavy to import
+class NonFatalValidationError(jsonschema.ValidationError):
-# and increases the start-up time
+    """A validation error that should only produce a warning."""
+
+
 def _make_validator():
-    import jsonschema
 
     def _validate_spec(validator, is_spec, instance, schema):
         """Check if the attributes on instance are valid specs."""
-        import jsonschema
 
         import spack.spec_parser
 
@@ -56,15 +57,18 @@ def _deprecated_properties(validator, deprecated, instance, schema):
 
         # Process issues
         errors = []
+        warnings = []
         for name in issues:
             msg = deprecations[name].message.format(name=name)
             if deprecations[name].error:
                 errors.append(msg)
             else:
-                warnings.warn(msg)
+                warnings.append(msg)
 
         if errors:
             yield jsonschema.ValidationError("\n".join(errors))
+        if warnings:
+            yield NonFatalValidationError("\n".join(warnings))
 
     return jsonschema.validators.extend(
         jsonschema.Draft4Validator,

lib/spack/spack/schema/mirrors.py

@@ -9,6 +9,8 @@
 """
 from typing import Any, Dict
 
+import jsonschema
+
 #: Common properties for connection specification
 connection = {
     "url": {"type": "string"},
@@ -102,7 +104,6 @@
 
 
 def update(data):
-    import jsonschema
 
     errors = []