Environments: add run deps to shell modifications (#23485)

When adding an Environment to a user's shell, Spack was only adding
root specs. This now includes run dependencies of root specs.

lib/spack/spack/environment.py

@@ -1276,19 +1276,36 @@ def check_views(self):
     def _env_modifications_for_default_view(self, reverse=False):
         all_mods = spack.util.environment.EnvironmentModifications()
 
-        errors = []
-        for _, spec in self.concretized_specs():
-            if spec in self.default_view and spec.package.installed:
-                try:
-                    mods = uenv.environment_modifications_for_spec(
-                        spec, self.default_view)
-                except Exception as e:
-                    msg = ("couldn't get environment settings for %s"
-                           % spec.format("{name}@{version} /{hash:7}"))
-                    errors.append((msg, str(e)))
-                    continue
+        visited = set()
 
-                all_mods.extend(mods.reversed() if reverse else mods)
+        errors = []
+        for _, root_spec in self.concretized_specs():
+            if root_spec in self.default_view and root_spec.package.installed:
+                for spec in root_spec.traverse(deptype='run', root=True):
+                    if spec.name in visited:
+                        # It is expected that only one instance of the package
+                        # can be added to the environment - do not attempt to
+                        # add multiple.
+                        tty.debug(
+                            "Not adding {0} to shell modifications: "
+                            "this package has already been added".format(
+                                spec.format("{name}/{hash:7}")
+                            )
+                        )
+                        continue
+                    else:
+                        visited.add(spec.name)
+
+                    try:
+                        mods = uenv.environment_modifications_for_spec(
+                            spec, self.default_view)
+                    except Exception as e:
+                        msg = ("couldn't get environment settings for %s"
+                               % spec.format("{name}@{version} /{hash:7}"))
+                        errors.append((msg, str(e)))
+                        continue
+
+                    all_mods.extend(mods.reversed() if reverse else mods)
 
         return all_mods, errors
 

lib/spack/spack/test/cmd/env.py

@@ -200,6 +200,19 @@ def setup_error(pkg, env):
     assert "Warning: couldn't get environment settings" in err
 
 
+def test_activate_adds_transitive_run_deps_to_path(
+        install_mockery, mock_fetch, monkeypatch):
+    env('create', 'test')
+    install = SpackCommand('install')
+
+    e = ev.read('test')
+    with e:
+        install('depends-on-run-env')
+
+    cmds = spack.environment.activate(e)
+    assert 'DEPENDENCY_ENV_VAR=1' in cmds
+
+
 def test_env_install_same_spec_twice(install_mockery, mock_fetch):
     env('create', 'test')