bootstrap: fix bootstrapping GnuPG from different macOS versions (#28350)

lib/spack/spack/bootstrap.py

@@ -575,7 +575,9 @@ def ensure_executables_in_path_or_raise(executables, abstract_spec):
                         root=True, order='post', deptype=('link', 'run')
                 ):
                     env_mods.extend(
-                        spack.user_environment.environment_modifications_for_spec(dep)
+                        spack.user_environment.environment_modifications_for_spec(
+                            dep, set_package_py_globals=False
+                        )
                     )
                 cmd.add_default_envmod(env_mods)
                 return cmd

lib/spack/spack/build_environment.py

@@ -856,7 +856,9 @@ def _make_runnable(pkg, env):
             env.prepend_path('PATH', bin_dir)
 
 
-def modifications_from_dependencies(spec, context, custom_mods_only=True):
+def modifications_from_dependencies(
+        spec, context, custom_mods_only=True, set_package_py_globals=True
+):
     """Returns the environment modifications that are required by
     the dependencies of a spec and also applies modifications
     to this spec's package at module scope, if need be.
@@ -889,6 +891,11 @@ def modifications_from_dependencies(spec, context, custom_mods_only=True):
         spec (spack.spec.Spec): spec for which we want the modifications
         context (str): either 'build' for build-time modifications or 'run'
             for run-time modifications
+        custom_mods_only (bool): if True returns only custom modifications, if False
+            returns custom and default modifications
+        set_package_py_globals (bool): whether or not to set the global variables in the
+            package.py files (this may be problematic when using buildcaches that have
+            been built on a different but compatible OS)
     """
     if context not in ['build', 'run', 'test']:
         raise ValueError(
@@ -962,7 +969,8 @@ def add_modifications_for_dep(dep):
         # PKG_CONFIG_PATH)
         if dep in custom_mod_deps:
             dpkg = dep.package
-            set_module_variables_for_package(dpkg)
+            if set_package_py_globals:
+                set_module_variables_for_package(dpkg)
             # Allow dependencies to modify the module
             dpkg.setup_dependent_package(spec.package.module, spec)
             if context == 'build':

lib/spack/spack/user_environment.py

@@ -65,11 +65,19 @@ def unconditional_environment_modifications(view):
     return env
 
 
-def environment_modifications_for_spec(spec, view=None):
+def environment_modifications_for_spec(spec, view=None, set_package_py_globals=True):
     """List of environment (shell) modifications to be processed for spec.
 
     This list is specific to the location of the spec or its projection in
-    the view."""
+    the view.
+
+    Args:
+        spec (spack.spec.Spec): spec for which to list the environment modifications
+        view: view associated with the spec passed as first argument
+        set_package_py_globals (bool): whether or not to set the global variables in the
+            package.py files (this may be problematic when using buildcaches that have
+            been built on a different but compatible OS)
+    """
     spec = spec.copy()
     if view and not spec.external:
         spec.prefix = prefix.Prefix(view.get_projection_for_spec(spec))
@@ -86,12 +94,13 @@ def environment_modifications_for_spec(spec, view=None):
     # before asking for package-specific modifications
     env.extend(
         spack.build_environment.modifications_from_dependencies(
-            spec, context='run'
+            spec, context='run', set_package_py_globals=set_package_py_globals
         )
     )
 
-    # Package specific modifications
+    if set_package_py_globals:
-    spack.build_environment.set_module_variables_for_package(spec.package)
+        spack.build_environment.set_module_variables_for_package(spec.package)
+
     spec.package.setup_run_environment(env)
 
     return env