Replace erts interface towards reservoir simulators

This replaces the yaml configuration file for Eclipse100/300 with a set
of environment variables set through the plugin system. Ert cannot any
longer start the raw Eclipse binary itself, it depends on the vendor
supplied wrapper binary called "eclrun".

Similarly, for OPM flow, Ert will now support a wrapper script "flowrun"
if it is present, assuming it has a similar command line API as eclrun.
If flowrun is not present, it will look for a binary "flow" in $PATH
which can be used, but then only with single-cpu possibilities.

Users can point to a custom location of eclrun by adding SETENV to the
configuration file.

src/ert/config/ert_config.py

@@ -732,10 +732,15 @@ def _create_list_of_forward_model_steps_to_run(
         cls,
         installed_steps: dict[str, ForwardModelStep],
         substitutions: Substitutions,
-        config_dict,
+        config_dict: dict,
     ) -> list[ForwardModelStep]:
         errors = []
         fm_steps = []
+
+        env_vars = {}
+        for key, val in config_dict.get("SETENV", []):
+            env_vars[key] = val
+
         for fm_step_description in config_dict.get(ConfigKeys.FORWARD_MODEL, []):
             if len(fm_step_description) > 1:
                 unsubstituted_step_name, args = fm_step_description
@@ -800,9 +805,15 @@ def _create_list_of_forward_model_steps_to_run(
                         context=substitutions,
                         forward_model_steps=[fm_step],
                         skip_pre_experiment_validation=True,
+                        env_vars=env_vars,
                     )
-                    job_json = substituted_json["jobList"][0]
-                    fm_step.validate_pre_experiment(job_json)
+                    fm_json = substituted_json["jobList"][0]
+                    fm_json["environment"] = {
+                        **cls.ENV_PR_FM_STEP.get(fm_step.name, {}),  # plugins
+                        **fm_json["environment"],  # setenv
+                        **substituted_json["global_environment"],
+                    }
+                    fm_step.validate_pre_experiment(fm_json)
                 except ForwardModelStepValidationError as err:
                     errors.append(
                         ConfigValidationError.with_context(

src/ert/plugins/hook_implementations/forward_model_steps.py

@@ -1,20 +1,16 @@
-import os
 import shutil
 import subprocess
 from pathlib import Path
 from textwrap import dedent
 from typing import Literal
 
-import yaml
-
 from ert import (
     ForwardModelStepDocumentation,
     ForwardModelStepJSON,
     ForwardModelStepPlugin,
     ForwardModelStepValidationError,
     plugin,
 )
-from ert.plugins import ErtPluginManager
 
 
 class CarefulCopyFile(ForwardModelStepPlugin):
@@ -207,31 +203,33 @@ def __init__(self) -> None:
                 str(
                     (
                         Path(__file__)
-                        / "../../../resources/forward_models/res/script/ecl100.py"
+                        / "../../../resources/forward_models/run_reservoirsimulator.py"
                     ).resolve()
                 ),
-                "<ECLBASE>",
-                "-v",
+                "eclipse",
                 "<VERSION>",
+                "<ECLBASE>",
                 "-n",
                 "<NUM_CPU>",
                 "<OPTS>",
             ],
             default_mapping={"<NUM_CPU>": 1, "<OPTS>": ""},
         )
 
-    def validate_pre_experiment(self, _: ForwardModelStepJSON) -> None:
+    def validate_pre_experiment(self, fm_json: ForwardModelStepJSON) -> None:
         if "<VERSION>" not in self.private_args:
             raise ForwardModelStepValidationError(
                 "Forward model step ECLIPSE100 must be given a VERSION argument"
             )
         version = self.private_args["<VERSION>"]
-        available_versions = _available_eclrun_versions(simulator="eclipse")
+        available_versions = _available_eclrun_versions(
+            simulator="eclipse", env_vars=fm_json["environment"]
+        )
 
         if available_versions and version not in available_versions:
             raise ForwardModelStepValidationError(
-                f"Unavailable ECLIPSE100 version {version} current supported "
-                f"versions {available_versions}"
+                f"Unavailable ECLIPSE100 version {version}. "
+                f"Available versions: {available_versions}"
             )
 
     @staticmethod
@@ -265,30 +263,35 @@ def __init__(self) -> None:
                 str(
                     (
                         Path(__file__)
-                        / "../../../resources/forward_models/res/script/ecl300.py"
+                        / "../../../resources/forward_models/run_reservoirsimulator.py"
                     ).resolve()
                 ),
-                "<ECLBASE>",
-                "-v",
+                "e300",
                 "<VERSION>",
+                "<ECLBASE>",
                 "-n",
                 "<NUM_CPU>",
                 "<OPTS>",
             ],
             default_mapping={"<NUM_CPU>": 1, "<OPTS>": "", "<VERSION>": "version"},
         )
 
-    def validate_pre_experiment(self, _: ForwardModelStepJSON) -> None:
+    def validate_pre_experiment(
+        self,
+        fm_step_json: ForwardModelStepJSON,
+    ) -> None:
         if "<VERSION>" not in self.private_args:
             raise ForwardModelStepValidationError(
                 "Forward model step ECLIPSE300 must be given a VERSION argument"
             )
         version = self.private_args["<VERSION>"]
-        available_versions = _available_eclrun_versions(simulator="e300")
+        available_versions = _available_eclrun_versions(
+            simulator="e300", env_vars=fm_step_json["environment"]
+        )
         if available_versions and version not in available_versions:
             raise ForwardModelStepValidationError(
-                f"Unavailable ECLIPSE300 version {version} current supported "
-                f"versions {available_versions}"
+                f"Unavailable ECLIPSE300 version {version}. "
+                f"Available versions: {available_versions}"
             )
 
     @staticmethod
@@ -317,12 +320,12 @@ def __init__(self) -> None:
                 str(
                     (
                         Path(__file__)
-                        / "../../../resources/forward_models/res/script/flow.py"
+                        / "../../../resources/forward_models/run_reservoirsimulator.py"
                     ).resolve()
                 ),
-                "<ECLBASE>",
-                "-v",
+                "flow",
                 "<VERSION>",
+                "<ECLBASE>",
                 "-n",
                 "<NUM_CPU>",
                 "<OPTS>",
@@ -628,33 +631,22 @@ def installable_forward_model_steps() -> list[type[ForwardModelStepPlugin]]:
     return [*_UpperCaseFMSteps, *_LowerCaseFMSteps]
 
 
-def _available_eclrun_versions(simulator: Literal["eclipse", "e300"]) -> list[str]:
-    if shutil.which("eclrun") is None:
-        return []
-    pm = ErtPluginManager()
-    ecl_config_path = (
-        pm.get_ecl100_config_path()
-        if simulator == "eclipse"
-        else pm.get_ecl300_config_path()
-    )
-
-    if not ecl_config_path:
-        return []
-    eclrun_env = {"PATH": os.getenv("PATH", "")}
-
-    with open(ecl_config_path, encoding="utf-8") as f:
-        try:
-            config = yaml.safe_load(f)
-        except yaml.YAMLError as e:
-            raise ValueError(f"Failed parse: {ecl_config_path} as yaml") from e
-    ecl_install_path = config.get("eclrun_env", {}).get("PATH", "")
-    eclrun_env["PATH"] = eclrun_env["PATH"] + os.pathsep + ecl_install_path
-
+def _available_eclrun_versions(
+    simulator: Literal["eclipse", "e300"], env_vars: dict[str, str]
+) -> list[str]:
+    eclrun_path = env_vars.get("ECLRUN_PATH", "")
     try:
+        eclrun_abspath = shutil.which(Path(eclrun_path) / "eclrun")
+        if eclrun_abspath is None:
+            return []
         return (
             subprocess.check_output(
-                ["eclrun", "--report-versions", simulator],
-                env=eclrun_env,
+                [
+                    eclrun_abspath,
+                    simulator,
+                    "--report-versions",
+                ],
+                env=env_vars,
             )
             .decode("utf-8")
             .strip()