Fix runtime environment (scheduler, validation, etc.)

cylc/flow/config.py

@@ -75,11 +75,9 @@
 from cylc.flow.parsec.OrderedDict import OrderedDictWithDefaults
 from cylc.flow.parsec.util import replicate
 from cylc.flow.pathutil import (
-    get_workflow_run_dir,
-    get_workflow_run_scheduler_log_dir,
-    get_workflow_run_share_dir,
-    get_workflow_run_work_dir,
-    get_workflow_name_from_id
+    get_workflow_name_from_id,
+    get_cylc_run_dir,
+    is_relative_to,
 )
 from cylc.flow.platforms import FORBIDDEN_WITH_PLATFORM
 from cylc.flow.print_tree import print_tree
@@ -240,20 +238,27 @@ def __init__(
         work_dir: Optional[str] = None,
         share_dir: Optional[str] = None
     ) -> None:
+        """
+        Initialize the workflow config object.
+
+        Args:
+            workflow: workflow ID
+            fpath: workflow config file path
+            options: CLI options
+        """
         check_deprecation(Path(fpath))
         self.mem_log = mem_log_func
         if self.mem_log is None:
             self.mem_log = lambda x: None
         self.mem_log("config.py:config.py: start init config")
-        self.workflow = workflow  # workflow id
+        self.workflow = workflow
         self.workflow_name = get_workflow_name_from_id(self.workflow)
-        self.fpath = str(fpath)  # workflow definition
-        self.fdir = os.path.dirname(fpath)
-        self.run_dir = run_dir or get_workflow_run_dir(self.workflow)
-        self.log_dir = (log_dir or
-                        get_workflow_run_scheduler_log_dir(self.workflow))
-        self.share_dir = share_dir or get_workflow_run_share_dir(self.workflow)
-        self.work_dir = work_dir or get_workflow_run_work_dir(self.workflow)
+        self.fpath: Path = Path(fpath)
+        self.fdir = str(self.fpath.parent)
+        self.run_dir = run_dir
+        self.log_dir = log_dir
+        self.share_dir = share_dir
+        self.work_dir = work_dir
         self.options = options
         self.implicit_tasks: Set[str] = set()
         self.edges: Dict[
@@ -890,7 +895,7 @@ def _check_implicit_tasks(self) -> None:
             )
         # Allow implicit tasks in back-compat mode unless rose-suite.conf
         # present (to maintain compat with Rose 2019)
-        elif not Path(self.run_dir, 'rose-suite.conf').is_file():
+        elif not (self.fpath.parent / "rose-suite.conf").is_file():
             LOG.debug(msg)
             return
 
@@ -1491,19 +1496,41 @@ def print_first_parent_tree(self, pretty=False, titles=False):
         print_tree(tree, padding=padding, use_unicode=pretty)
 
     def process_workflow_env(self):
-        """Workflow context is exported to the local environment."""
+        """Export Workflow context to the local environment.
+
+        A source workflow has only a name.
+        Once installed it also has an ID and a run directory.
+        And at scheduler start-up it has work, share, and log sub-dirs too.
+        """
         for key, value in {
             **verbosity_to_env(cylc.flow.flags.verbosity),
-            'CYLC_WORKFLOW_ID': self.workflow,
             'CYLC_WORKFLOW_NAME': self.workflow_name,
             'CYLC_WORKFLOW_NAME_BASE': str(Path(self.workflow_name).name),
-            'CYLC_WORKFLOW_RUN_DIR': self.run_dir,
-            'CYLC_WORKFLOW_LOG_DIR': self.log_dir,
-            'CYLC_WORKFLOW_WORK_DIR': self.work_dir,
-            'CYLC_WORKFLOW_SHARE_DIR': self.share_dir,
         }.items():
             os.environ[key] = value
 
+        if is_relative_to(self.fdir, get_cylc_run_dir()):
+            # This is an installed workflow.
+            #  - self.run_dir is only defined by the scheduler
+            #  - but the run dir exists, created at installation
+            #  - run sub-dirs may exist, if this installation was run already
+            #    but if the scheduler is not running they shouldn't be used.
+            for key, value in {
+                'CYLC_WORKFLOW_ID': self.workflow,
+                'CYLC_WORKFLOW_RUN_DIR': str(self.fdir),
+            }.items():
+                os.environ[key] = value
+
+        if self.run_dir is not None:
+            # Run directory is only defined if the scheduler is running; in
+            # which case the following run sub-directories must exist.
+            for key, value in {
+                'CYLC_WORKFLOW_LOG_DIR': str(self.log_dir),
+                'CYLC_WORKFLOW_WORK_DIR': str(self.work_dir),
+                'CYLC_WORKFLOW_SHARE_DIR': str(self.share_dir),
+            }.items():
+                os.environ[key] = value
+
     def process_config_env(self):
         """Set local config derived environment."""
         os.environ['CYLC_UTC'] = str(get_utc_mode())

tests/unit/test_config.py

@@ -14,13 +14,15 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
 from optparse import Values
 from typing import Any, Callable, Dict, List, Optional, Tuple, Type
 from pathlib import Path
 import pytest
 import logging
 from types import SimpleNamespace
 from unittest.mock import Mock
+from contextlib import suppress
 
 from cylc.flow import CYLC_LOG
 from cylc.flow.config import WorkflowConfig
@@ -1565,3 +1567,94 @@ def test__warn_if_queues_have_implicit_tasks(caplog):
     assert "'baz'" not in result
     assert f"showing first {max_warning_lines}" in result
 
+
+@pytest.mark.parametrize(
+    'installed, run_dir, cylc_vars',
+    [
+        pytest.param(
+            False,  # not installed (parsing a source dir)
+            None,  # no run directory passed to config object by scheduler
+            {
+                'CYLC_WORKFLOW_NAME': True,  # expected environment variables
+                'CYLC_WORKFLOW_ID': False,
+                'CYLC_WORKFLOW_RUN_DIR': False,
+                'CYLC_WORKFLOW_WORK_DIR': False,
+                'CYLC_WORKFLOW_SHARE_DIR': False,
+                'CYLC_WORKFLOW_LOG_DIR': False,
+            },
+            id="source-dir"
+        ),
+        pytest.param(
+            True,
+            None,
+            {
+                'CYLC_WORKFLOW_NAME': True,
+                'CYLC_WORKFLOW_ID': True,
+                'CYLC_WORKFLOW_RUN_DIR': True,
+                'CYLC_WORKFLOW_WORK_DIR': False,
+                'CYLC_WORKFLOW_SHARE_DIR': False,
+                'CYLC_WORKFLOW_LOG_DIR': False,
+            },
+            id="run-dir"
+        ),
+        pytest.param(
+            True,
+            "/some/path",
+            {
+                'CYLC_WORKFLOW_NAME': True,
+                'CYLC_WORKFLOW_ID': True,
+                'CYLC_WORKFLOW_RUN_DIR': True,
+                'CYLC_WORKFLOW_WORK_DIR': True,
+                'CYLC_WORKFLOW_SHARE_DIR': True,
+                'CYLC_WORKFLOW_LOG_DIR': True,
+            },
+            id="run-dir-from-scheduler"
+        ),
+    ]
+)
+def test_cylc_env_at_parsing(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+    installed,
+    run_dir,
+    cylc_vars
+):
+    """Check that CYLC_ environment vars exported during config file parsing
+       are appropriate to the workflow context (source, installed, or running).
+    """
+
+    # Purge environment from previous tests.
+    for key in cylc_vars.keys():
+        with suppress(KeyError):
+            del os.environ[key]
+
+    flow_file = tmp_path / WorkflowFiles.FLOW_FILE
+    flow_config = """
+    [scheduler]
+        allow implicit tasks = True
+    [scheduling]
+        [[graph]]
+            R1 = 'foo'
+    """
+
+    flow_file.write_text(flow_config)
+
+    # Make it look as if path is relative to cylc-run (i.e. installed).
+    monkeypatch.setattr(
+        'cylc.flow.config.is_relative_to',
+        lambda _a, _b: installed
+    )
+
+    # Parse the workflow config then check the environment.
+    WorkflowConfig(
+        workflow="name", fpath=flow_file, options=Mock(spec=[]),
+        run_dir=run_dir
+    )
+
+    cylc_env = [k for k in os.environ.keys() if k.startswith('CYLC_')]
+
+    for var, expected in cylc_vars.items():
+        if expected:
+            assert var in cylc_env
+        else:
+            assert var not in cylc_env