Drop classic solver workaround if conda-libmamba-solver is at least 24.1

Fixes #118

CHANGELOG.md

@@ -1,6 +1,10 @@
 # whl2conda changes
 
 ## [24.4.0] - *in progress*
+### Changes
+* Only use classic installer in `whl2conda install` environments if 
+    `conda-libmamba-solver` in base environment has version less than 24.1.0 (see #118)
+
 ### Bug fixes
 * Transfer executable file permissions from wheel (#135)
 * Correct typos in documentation.

Makefile

@@ -109,6 +109,7 @@ ruff:
 check-format:
 	$(CONDA_RUN) ruff format --check src test
 
+.PHONY: test
 test: pytest
 
 coverage:

src/whl2conda/cli/install.py

@@ -286,17 +286,26 @@ def conda_env_install(parsed: InstallArgs, dependencies: list[str]):
             else:
                 subprocess.check_call(install_pkg_cmd)
 
-        # Workaround for https://github.com/conda/conda/issues/13479
-        # If a package is installed directly from file, then set solver to classic
-        set_solver_cmd = (
-            ["conda", "run"]
-            + env_opts
-            + ["conda", "config", "--env", "--set", "solver", "classic"]
-        )
+        check_libmamba_cmd = "conda list -n base conda-libmamba-solver --json".split()
         if parsed.dry_run:
-            print("Running ", set_solver_cmd)
+            print("running ", check_libmamba_cmd)
         else:
-            subprocess.check_call(set_solver_cmd)
+            jsonstr = subprocess.check_output(check_libmamba_cmd, encoding="utf-8")
+            jobj = json.loads(jsonstr)
+            version_str = jobj and jobj[0].get("version")
+            version = tuple(int(s) for s in version_str.split("."))
+            if version < (24, 1, 0):
+                # Workaround for https://github.com/conda/conda/issues/13479
+                # If a package is installed directly from file, then set solver to classic
+                set_solver_cmd = (
+                    ["conda", "run"]
+                    + env_opts
+                    + ["conda", "config", "--env", "--set", "solver", "classic"]
+                )
+                if parsed.dry_run:
+                    print("Running ", set_solver_cmd)
+                else:
+                    subprocess.check_call(set_solver_cmd)
 
 
 conda_depend_re = re.compile(r"\s*(?P<name>[\w\d.-]+)\s*(?P<version>.*)")

test/cli/test_install.py

@@ -20,6 +20,7 @@
 
 import re
 from pathlib import Path
+from textwrap import dedent
 from typing import Any, Sequence
 
 import pytest
@@ -187,13 +188,6 @@ def test_env_install(
     assert "quaternion" in packages_by_name
     assert "simple" in packages_by_name
 
-    # solver should be set to classic to avoid https://github.com/conda/conda/issues/13479
-    d = conda_json(
-        "run", "-p", str(prefix), "conda", "config", "--json", "--show", "solver"
-    )
-    assert d["solver"] == "classic"
-
-    conda_output("create", "-n", "test-env", "python=3.9")
     assert test_env.is_dir()
 
     main([
@@ -223,9 +217,36 @@ def test_env_install_whitebox(
     prefix = tmp_path.joinpath("prefix")
 
     call_args: list[list[str]] = []
+    fake_call_results: list[Any] = [
+        None,
+        None,
+        dedent(
+            """
+            [
+              {
+                "base_url": "https://conda.anaconda.org/conda-forge",
+                "build_number": 0,
+                "build_string": "pyhd8ed1ab_0",
+                "channel": "conda-forge",
+                "dist_name": "conda-libmamba-solver-24.1.0-pyhd8ed1ab_0",
+                "name": "conda-libmamba-solver",
+                "platform": "noarch",
+                "version": "24.1.0"
+              }
+            ]
+            """
+        ),
+    ]
 
-    def fake_call(cmd: Sequence[str]) -> Any:
+    def fake_call(cmd: Sequence[str], encoding=None) -> Any:
+        if encoding:
+            assert encoding == "utf-8"
+        i = len(call_args)
         call_args.append(list(cmd))
+        if len(fake_call_results) > i:
+            return fake_call_results[i]
+        else:
+            return None
 
     monkeypatch.setattr("subprocess.check_call", fake_call)
     monkeypatch.setattr("subprocess.check_output", fake_call)
@@ -283,6 +304,33 @@ def fake_call(cmd: Sequence[str]) -> Any:
     out, err = capsys.readouterr()
     assert "Running" in out
 
+    # Test for presence of conda solver workaround for conda-libmamba-solver < 24.1
+    call_args.clear()
+    fake_call_results[2] = dedent(
+        """
+        [
+          {
+            "base_url": "https://conda.anaconda.org/conda-forge",
+            "build_number": 0,
+            "build_string": "pyhd8ed1ab_0",
+            "channel": "conda-forge",
+            "dist_name": "conda-libmamba-solver-23.12.0-pyhd8ed1ab_0",
+            "name": "conda-libmamba-solver",
+            "platform": "noarch",
+            "version": "23.12.0"
+          }
+        ]
+        """
+    )
+
+    main(cmd_start + ["--name", "test-env", "--create", "--mamba"])
+    assert len(call_args) == 4
+    call4 = call_args[3]
+    assert call4[:4] == "conda run --name test-env".split()
+    assert call4[4:6] == "conda config".split()
+    assert "--set solver classic" in " ".join(call4)
+    assert "--env" in call4
+
 
 def test_prune_dependencies() -> None:
     """Unit test for internal _prune_dependencies function"""