Properly expand environment variables in execution modes

Author: vkarak

reframe/frontend/cli.py

@@ -941,9 +941,12 @@ def restrict_logging():
                 # We lexically split the mode options, because otherwise spaces
                 # will be treated as part of the option argument;
                 # see GH bug #1554
-                mode_args = list(
-                    itertools.chain.from_iterable(shlex.split(m)
-                                                  for m in mode_args))
+                mode_args = list(itertools.chain.from_iterable(
+                    shlex.split(osext.expandvars(arg)) for arg in mode_args)
+                )
+                printer.debug(f'Expanding execution mode {options.mode!r}: '
+                              f'{" ".join(mode_args)}')
+
                 # Parse the mode's options and reparse the command-line
                 options = argparser.parse_args(mode_args,
                                                suppress_required=True)

unittests/resources/config/settings.py

@@ -275,6 +275,11 @@ def hostname():
                 '-p builtin',
                 '-S local=1'
             ]
+        },
+        {
+            'name': 'env_vars',
+            'options': ['-n', '${TEST_NAME_PATTERN}',
+                        '-S', '${VAR}=${VAL}']
         }
     ],
     'logging': [

unittests/test_cli.py

@@ -542,6 +542,20 @@ def test_execution_modes(run_reframe, run_action):
     assert 'Ran 1/1 test case' in stdout
 
 
+def test_execution_modes_envvar_expansion(run_reframe, monkeypatch):
+    monkeypatch.setenv('TEST_NAME_PATTERN', '^HelloTest$')
+    monkeypatch.setenv('VAR', 'x')
+    monkeypatch.setenv('VAL', '1')
+    returncode, stdout, stderr = run_reframe(
+        mode='env_vars', action='list'
+    )
+    assert returncode == 0
+    assert 'Traceback' not in stdout
+    assert 'Traceback' not in stderr
+    assert "the following variables were not set: 'x'"
+    assert 'Found 1 check(s)' in stdout
+
+
 def test_invalid_mode_error(run_reframe):
     mode = 'invalid'
     returncode, stdout, stderr = run_reframe(