--scope: lazy defaults (#41353)

9 files changed, 53 insertions, 63 deletions

diff --git a/lib/spack/spack/cmd/bootstrap.py b/lib/spack/spack/cmd/bootstrap.py
index 7c07625895..c9b20a07ad 100644
--- a/lib/spack/spack/cmd/bootstrap.py
+++ b/lib/spack/spack/cmd/bootstrap.py
@@ -69,10 +69,7 @@ SOURCE_METADATA = {
 
 def _add_scope_option(parser):
     parser.add_argument(
-        "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        help="configuration scope to read/modify",
+        "--scope", action=arguments.ConfigScope, help="configuration scope to read/modify"
     )
 
 
diff --git a/lib/spack/spack/cmd/buildcache.py b/lib/spack/spack/cmd/buildcache.py
index 7896b54373..05b7bd783a 100644
--- a/lib/spack/spack/cmd/buildcache.py
+++ b/lib/spack/spack/cmd/buildcache.py
@@ -184,9 +184,8 @@ def setup_parser(subparser: argparse.ArgumentParser):
     # used to construct scope arguments below
     check.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope containing mirrors to check",
     )
     check_spec_or_specfile = check.add_mutually_exclusive_group(required=True)
diff --git a/lib/spack/spack/cmd/common/arguments.py b/lib/spack/spack/cmd/common/arguments.py
index 79f844d0e2..883a7d31c2 100644
--- a/lib/spack/spack/cmd/common/arguments.py
+++ b/lib/spack/spack/cmd/common/arguments.py
@@ -124,14 +124,31 @@ class DeptypeAction(argparse.Action):
         setattr(namespace, self.dest, deptype)
 
 
-class ConfigScopeChoices:
-    """A lazy list of config scope values (values may change at runtime in tests)."""
+class ConfigScope(argparse.Action):
+    """Pick the currently configured config scopes."""
 
-    def __contains__(self, item):
-        return item in spack.config.scopes()
+    def __init__(self, *args, **kwargs) -> None:
+        kwargs.setdefault("metavar", spack.config.SCOPES_METAVAR)
+        super().__init__(*args, **kwargs)
 
-    def __iter__(self):
-        return iter(spack.config.scopes().keys())
+    @property
+    def default(self):
+        return self._default() if callable(self._default) else self._default
+
+    @default.setter
+    def default(self, value):
+        self._default = value
+
+    @property
+    def choices(self):
+        return spack.config.scopes().keys()
+
+    @choices.setter
+    def choices(self, value):
+        pass
+
+    def __call__(self, parser, namespace, values, option_string=None):
+        setattr(namespace, self.dest, values)
 
 
 def _cdash_reporter(namespace):
diff --git a/lib/spack/spack/cmd/compiler.py b/lib/spack/spack/cmd/compiler.py
index 6ba6371087..6cfb73c3e8 100644
--- a/lib/spack/spack/cmd/compiler.py
+++ b/lib/spack/spack/cmd/compiler.py
@@ -46,9 +46,8 @@ def setup_parser(subparser):
     find_parser.add_argument("add_paths", nargs=argparse.REMAINDER)
     find_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope("compilers"),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope("compilers"),
         help="configuration scope to modify",
     )
 
@@ -59,20 +58,15 @@ def setup_parser(subparser):
     )
     remove_parser.add_argument("compiler_spec")
     remove_parser.add_argument(
-        "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=None,
-        help="configuration scope to modify",
+        "--scope", action=arguments.ConfigScope, default=None, help="configuration scope to modify"
     )
 
     # List
     list_parser = sp.add_parser("list", help="list available compilers")
     list_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_list_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_list_scope(),
         help="configuration scope to read from",
     )
 
@@ -81,9 +75,8 @@ def setup_parser(subparser):
     info_parser.add_argument("compiler_spec")
     info_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_list_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_list_scope(),
         help="configuration scope to read from",
     )
 
diff --git a/lib/spack/spack/cmd/compilers.py b/lib/spack/spack/cmd/compilers.py
index 25831da7fb..7bd8cd4f37 100644
--- a/lib/spack/spack/cmd/compilers.py
+++ b/lib/spack/spack/cmd/compilers.py
@@ -3,7 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-import spack.config
 from spack.cmd.common import arguments
 from spack.cmd.compiler import compiler_list
 
@@ -14,10 +13,7 @@ level = "short"
 
 def setup_parser(subparser):
     subparser.add_argument(
-        "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        help="configuration scope to read/modify",
+        "--scope", action=arguments.ConfigScope, help="configuration scope to read/modify"
     )
 
 
diff --git a/lib/spack/spack/cmd/config.py b/lib/spack/spack/cmd/config.py
index c99f045876..e7d459ff77 100644
--- a/lib/spack/spack/cmd/config.py
+++ b/lib/spack/spack/cmd/config.py
@@ -28,10 +28,7 @@ level = "long"
 def setup_parser(subparser):
     # User can only choose one
     subparser.add_argument(
-        "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        help="configuration scope to read/modify",
+        "--scope", action=arguments.ConfigScope, help="configuration scope to read/modify"
     )
 
     sp = subparser.add_subparsers(metavar="SUBCOMMAND", dest="config_command")
diff --git a/lib/spack/spack/cmd/external.py b/lib/spack/spack/cmd/external.py
index c3e791fd6a..eb96dfad98 100644
--- a/lib/spack/spack/cmd/external.py
+++ b/lib/spack/spack/cmd/external.py
@@ -46,9 +46,8 @@ def setup_parser(subparser):
     )
     find_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope("packages"),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope("packages"),
         help="configuration scope to modify",
     )
     find_parser.add_argument(
diff --git a/lib/spack/spack/cmd/mirror.py b/lib/spack/spack/cmd/mirror.py
index a9c93618c7..91a3f27931 100644
--- a/lib/spack/spack/cmd/mirror.py
+++ b/lib/spack/spack/cmd/mirror.py
@@ -94,9 +94,8 @@ def setup_parser(subparser):
     add_parser.add_argument("url", help="url of mirror directory from 'spack mirror create'")
     add_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope to modify",
     )
     add_parser.add_argument(
@@ -114,9 +113,8 @@ def setup_parser(subparser):
     remove_parser.add_argument("name", help="mnemonic name for mirror", metavar="mirror")
     remove_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope to modify",
     )
 
@@ -133,9 +131,8 @@ def setup_parser(subparser):
     )
     set_url_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope to modify",
     )
     arguments.add_connection_args(set_url_parser, False)
@@ -162,9 +159,8 @@ def setup_parser(subparser):
     set_parser.add_argument("--url", help="url of mirror directory from 'spack mirror create'")
     set_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope to modify",
     )
     arguments.add_connection_args(set_parser, False)
@@ -173,9 +169,8 @@ def setup_parser(subparser):
     list_parser = sp.add_parser("list", help=mirror_list.__doc__)
     list_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_list_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_list_scope(),
         help="configuration scope to read from",
     )
 
diff --git a/lib/spack/spack/cmd/repo.py b/lib/spack/spack/cmd/repo.py
index a8bba6c2dc..71b6cbc0d4 100644
--- a/lib/spack/spack/cmd/repo.py
+++ b/lib/spack/spack/cmd/repo.py
@@ -43,9 +43,8 @@ def setup_parser(subparser):
     list_parser = sp.add_parser("list", help=repo_list.__doc__)
     list_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_list_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_list_scope(),
         help="configuration scope to read from",
     )
 
@@ -54,9 +53,8 @@ def setup_parser(subparser):
     add_parser.add_argument("path", help="path to a Spack package repository directory")
     add_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope to modify",
     )
 
@@ -67,9 +65,8 @@ def setup_parser(subparser):
     )
     remove_parser.add_argument(
         "--scope",
-        choices=arguments.ConfigScopeChoices(),
-        metavar=spack.config.SCOPES_METAVAR,
-        default=spack.config.default_modify_scope(),
+        action=arguments.ConfigScope,
+        default=lambda: spack.config.default_modify_scope(),
         help="configuration scope to modify",
     )