Fix the python patch version retrieval when passing an executable

poetry/utils/env.py

@@ -494,18 +494,19 @@ def create_venv(
  python_patch = ".".join([str(v) for v in sys.version_info[:3]])
  python_minor = ".".join([str(v) for v in sys.version_info[:2]])
  if executable:
- python_minor = decode(
+ python_patch = decode(
  subprocess.check_output(
  " ".join(
  [
  executable,
  "-c",
- "\"import sys; print('.'.join([str(s) for s in sys.version_info[:2]]))\"",
+ "\"import sys; print('.'.join([str(s) for s in sys.version_info[:3]]))\"",
  ]
  ),
  shell=True,
  ).strip()
  )
+ python_minor = ".".join(python_patch.split(".")[:2])
 
  supported_python = self._poetry.package.python_constraint
  if not supported_python.allows(Version.parse(python_patch)):
@@ -517,7 +518,7 @@ def create_venv(
  # Otherwise, we try to find a compatible Python version.
  if executable:
  raise NoCompatiblePythonVersionFound(
- self._poetry.package.python_versions, python_minor
+ self._poetry.package.python_versions, python_patch
  )
 
  io.write_line(

tests/utils/test_env.py

@@ -700,6 +700,45 @@ def test_create_venv_uses_patch_version_to_detect_compatibility(
  )
 
 
+def test_create_venv_uses_patch_version_to_detect_compatibility_with_executable(
+ manager, poetry, config, mocker
+):
+ if "VIRTUAL_ENV" in os.environ:
+ del os.environ["VIRTUAL_ENV"]
+
+ version = Version.parse(".".join(str(c) for c in sys.version_info[:3]))
+ poetry.package.python_versions = "~{}".format(
+ ".".join(str(c) for c in (version.major, version.minor - 1, 0))
+ )
+ venv_name = manager.generate_env_name("simple-project", str(poetry.file.parent))
+
+ check_output = mocker.patch(
+ "poetry.utils._compat.subprocess.check_output",
+ side_effect=check_output_wrapper(
+ Version.parse("{}.{}.0".format(version.major, version.minor - 1))
+ ),
+ )
+ m = mocker.patch(
+ "poetry.utils.env.EnvManager.build_venv", side_effect=lambda *args, **kwargs: ""
+ )
+
+ manager.create_venv(
+ NullIO(), executable="python{}.{}".format(version.major, version.minor - 1)
+ )
+
+ assert check_output.called
+ m.assert_called_with(
+ str(
+ Path(
+ "/foo/virtualenvs/{}-py{}.{}".format(
+ venv_name, version.major, version.minor - 1
+ )
+ )
+ ),
+ executable="python{}.{}".format(version.major, version.minor - 1),
+ )
+
+
 def test_activate_with_in_project_setting_does_not_fail_if_no_venvs_dir(
  manager, poetry, config, tmp_dir, mocker
 ):