Use the proper main Python constraint when resolving for installation (…

…#2625)

poetry/puzzle/provider.py

@@ -18,6 +18,7 @@
 from poetry.core.packages import URLDependency
 from poetry.core.packages import VCSDependency
 from poetry.core.packages.utils.utils import get_python_constraint_from_marker
+from poetry.core.semver.version import Version
 from poetry.core.vcs.git import Git
 from poetry.core.version.markers import MarkerUnion
 from poetry.inspection.info import PackageInfo
@@ -80,12 +81,15 @@ def set_overrides(self, overrides):
     @contextmanager
     def use_environment(self, env):  # type: (Env) -> Provider
         original_env = self._env
+        original_python_constraint = self._python_constraint
 
         self._env = env
+        self._python_constraint = Version.parse(env.marker_env["python_full_version"])
 
         yield self
 
         self._env = original_env
+        self._python_constraint = original_python_constraint
 
     def search_for(self, dependency):  # type: (Dependency) -> List[Package]
         """
@@ -380,9 +384,7 @@ def incompatibilities_for(
         else:
             dependencies = package.requires
 
-            if not package.python_constraint.allows_all(
-                self._package.python_constraint
-            ):
+            if not package.python_constraint.allows_all(self._python_constraint):
                 transitive_python_constraint = get_python_constraint_from_marker(
                     package.dependency.transitive_marker
                 )
@@ -392,7 +394,7 @@ def incompatibilities_for(
                 difference = transitive_python_constraint.difference(intersection)
                 if (
                     transitive_python_constraint.is_any()
-                    or self._package.python_constraint.intersect(
+                    or self._python_constraint.intersect(
                         package.dependency.python_constraint
                     ).is_empty()
                     or intersection.is_empty()
@@ -402,7 +404,7 @@ def incompatibilities_for(
                         Incompatibility(
                             [Term(package.to_dependency(), True)],
                             PythonCause(
-                                package.python_versions, self._package.python_versions
+                                package.python_versions, str(self._python_constraint)
                             ),
                         )
                     ]
@@ -411,7 +413,7 @@ def incompatibilities_for(
             dep
             for dep in dependencies
             if dep.name not in self.UNSAFE_PACKAGES
-            and self._package.python_constraint.allows_any(dep.python_constraint)
+            and self._python_constraint.allows_any(dep.python_constraint)
             and (not self._env or dep.marker.validate(self._env.marker_env))
         ]
 
@@ -477,7 +479,7 @@ def complete_package(
         _dependencies = [
             r
             for r in requires
-            if self._package.python_constraint.allows_any(r.python_constraint)
+            if self._python_constraint.allows_any(r.python_constraint)
             and r.name not in self.UNSAFE_PACKAGES
             and (not self._env or r.marker.validate(self._env.marker_env))
         ]

poetry/puzzle/solver.py

@@ -4,6 +4,7 @@
 from typing import Any
 from typing import Dict
 from typing import List
+from typing import Optional
 
 from clikit.io import ConsoleIO
 
@@ -33,14 +34,19 @@ def __init__(
         installed,  # type: Repository
         locked,  # type: Repository
         io,  # type: ConsoleIO
-        remove_untracked=False,  # type: bool
+        remove_untracked=False,  # type: bool,
+        provider=None,  # type: Optional[Provider]
     ):
         self._package = package
         self._pool = pool
         self._installed = installed
         self._locked = locked
         self._io = io
-        self._provider = Provider(self._package, self._pool, self._io)
+
+        if provider is None:
+            provider = Provider(self._package, self._pool, self._io)
+
+        self._provider = provider
         self._overrides = []
         self._remove_untracked = remove_untracked
 

poetry/utils/env.py

@@ -1238,6 +1238,7 @@ def get_marker_env(self):  # type: () -> Dict[str, Any]
         marker_env["python_implementation"] = self._python_implementation
         marker_env["version_info"] = self._version_info
         marker_env["python_version"] = ".".join(str(v) for v in self._version_info[:2])
+        marker_env["python_full_version"] = ".".join(str(v) for v in self._version_info)
         marker_env["sys_platform"] = self._platform
 
         return marker_env

tests/mixology/version_solver/conftest.py

@@ -3,11 +3,17 @@
 from clikit.io import NullIO
 
 from poetry.core.packages.project_package import ProjectPackage
-from poetry.puzzle.provider import Provider
+from poetry.puzzle.provider import Provider as BaseProvider
 from poetry.repositories import Pool
 from poetry.repositories import Repository
 
 
+class Provider(BaseProvider):
+    def set_package_python_versions(self, python_versions):
+        self._package.python_versions = python_versions
+        self._python_constraint = self._package.python_constraint
+
+
 @pytest.fixture
 def repo():
     return Repository()

tests/mixology/version_solver/test_python_constraint.py

@@ -3,12 +3,12 @@
 
 
 def test_dependency_does_not_match_root_python_constraint(root, provider, repo):
-    root.python_versions = "^3.6"
+    provider.set_package_python_versions("^3.6")
     root.add_dependency("foo", "*")
 
     add_to_repo(repo, "foo", "1.0.0", python="<3.5")
 
-    error = """The current project's Python requirement (^3.6) \
+    error = """The current project's Python requirement (>=3.6,<4.0) \
 is not compatible with some of the required packages Python requirement:
   - foo requires Python <3.5, so it will not be satisfied for Python >=3.6,<4.0
 

tests/puzzle/test_solver.py

@@ -7,10 +7,12 @@
 from poetry.core.version.markers import parse_marker
 from poetry.puzzle import Solver
 from poetry.puzzle.exceptions import SolverProblemError
+from poetry.puzzle.provider import Provider as BaseProvider
 from poetry.repositories.installed_repository import InstalledRepository
 from poetry.repositories.pool import Pool
 from poetry.repositories.repository import Repository
 from poetry.utils._compat import Path
+from poetry.utils.env import MockEnv
 from tests.helpers import get_dependency
 from tests.helpers import get_package
 from tests.repositories.test_legacy_repository import (
@@ -19,6 +21,12 @@
 from tests.repositories.test_pypi_repository import MockRepository as MockPyPIRepository
 
 
+class Provider(BaseProvider):
+    def set_package_python_versions(self, python_versions):
+        self._package.python_versions = python_versions
+        self._python_constraint = self._package.python_constraint
+
+
 @pytest.fixture()
 def io():
     return NullIO()
@@ -51,7 +59,9 @@ def pool(repo):
 
 @pytest.fixture()
 def solver(package, pool, installed, locked, io):
-    return Solver(package, pool, installed, locked, io)
+    return Solver(
+        package, pool, installed, locked, io, provider=Provider(package, pool, io)
+    )
 
 
 def check_solver_result(ops, expected):
@@ -295,7 +305,7 @@ def test_solver_sets_categories(solver, repo, package):
 
 
 def test_solver_respects_root_package_python_versions(solver, repo, package):
-    package.python_versions = "~3.4"
+    solver.provider.set_package_python_versions("~3.4")
     package.add_dependency("A")
     package.add_dependency("B")
 
@@ -326,7 +336,7 @@ def test_solver_respects_root_package_python_versions(solver, repo, package):
 
 
 def test_solver_fails_if_mismatch_root_python_versions(solver, repo, package):
-    package.python_versions = "^3.4"
+    solver.provider.set_package_python_versions("^3.4")
     package.add_dependency("A")
     package.add_dependency("B")
 
@@ -346,7 +356,7 @@ def test_solver_fails_if_mismatch_root_python_versions(solver, repo, package):
 
 
 def test_solver_solves_optional_and_compatible_packages(solver, repo, package):
-    package.python_versions = "~3.4"
+    solver.provider.set_package_python_versions("~3.4")
     package.extras["foo"] = [get_dependency("B")]
     package.add_dependency("A", {"version": "*", "python": "^3.4"})
     package.add_dependency("B", {"version": "*", "optional": True})
@@ -563,7 +573,7 @@ def test_solver_sub_dependencies_with_requirements_complex(solver, repo, package
 def test_solver_sub_dependencies_with_not_supported_python_version(
     solver, repo, package
 ):
-    package.python_versions = "^3.5"
+    solver.provider.set_package_python_versions("^3.5")
     package.add_dependency("A")
 
     package_a = get_package("A", "1.0")
@@ -583,7 +593,7 @@ def test_solver_sub_dependencies_with_not_supported_python_version(
 def test_solver_with_dependency_in_both_main_and_dev_dependencies(
     solver, repo, package
 ):
-    package.python_versions = "^3.5"
+    solver.provider.set_package_python_versions("^3.5")
     package.add_dependency("A")
     package.add_dependency("A", {"version": "*", "extras": ["foo"]}, category="dev")
 
@@ -962,7 +972,7 @@ def test_solver_can_resolve_git_dependencies_with_ref(solver, repo, package, ref
 def test_solver_does_not_trigger_conflict_for_python_constraint_if_python_requirement_is_compatible(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.4"
+    solver.provider.set_package_python_versions("~2.7 || ^3.4")
     package.add_dependency("A", {"version": "^1.0", "python": "^3.6"})
 
     package_a = get_package("A", "1.0.0")
@@ -978,7 +988,7 @@ def test_solver_does_not_trigger_conflict_for_python_constraint_if_python_requir
 def test_solver_does_not_trigger_conflict_for_python_constraint_if_python_requirement_is_compatible_multiple(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.4"
+    solver.provider.set_package_python_versions("~2.7 || ^3.4")
     package.add_dependency("A", {"version": "^1.0", "python": "^3.6"})
     package.add_dependency("B", {"version": "^1.0", "python": "^3.5.3"})
 
@@ -1006,7 +1016,7 @@ def test_solver_does_not_trigger_conflict_for_python_constraint_if_python_requir
 def test_solver_triggers_conflict_for_dependency_python_not_fully_compatible_with_package_python(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.4"
+    solver.provider.set_package_python_versions("~2.7 || ^3.4")
     package.add_dependency("A", {"version": "^1.0", "python": "^3.5"})
 
     package_a = get_package("A", "1.0.0")
@@ -1021,7 +1031,7 @@ def test_solver_triggers_conflict_for_dependency_python_not_fully_compatible_wit
 def test_solver_finds_compatible_package_for_dependency_python_not_fully_compatible_with_package_python(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.4"
+    solver.provider.set_package_python_versions("~2.7 || ^3.4")
     package.add_dependency("A", {"version": "^1.0", "python": "^3.5"})
 
     package_a101 = get_package("A", "1.0.1")
@@ -1077,7 +1087,7 @@ def test_solver_does_not_trigger_new_resolution_on_duplicate_dependencies_if_onl
 def test_solver_does_not_raise_conflict_for_locked_conditional_dependencies(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.4"
+    solver.provider.set_package_python_versions("~2.7 || ^3.4")
     package.add_dependency("A", {"version": "^1.0", "python": "^3.6"})
     package.add_dependency("B", "^1.0")
 
@@ -1161,7 +1171,7 @@ def test_solver_should_not_resolve_prerelease_version_if_not_requested(
 def test_solver_ignores_dependencies_with_incompatible_python_full_version_marker(
     solver, repo, package
 ):
-    package.python_versions = "^3.6"
+    solver.provider.set_package_python_versions("^3.6")
     package.add_dependency("A", "^1.0")
     package.add_dependency("B", "^2.0")
 
@@ -1729,7 +1739,7 @@ def test_solver_discards_packages_with_empty_markers(
 def test_solver_does_not_raise_conflict_for_conditional_dev_dependencies(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.5"
+    solver.provider.set_package_python_versions("~2.7 || ^3.5")
     package.add_dependency("A", {"version": "^1.0", "python": "~2.7"}, category="dev")
     package.add_dependency("A", {"version": "^2.0", "python": "^3.5"}, category="dev")
 
@@ -1753,7 +1763,7 @@ def test_solver_does_not_raise_conflict_for_conditional_dev_dependencies(
 def test_solver_does_not_loop_indefinitely_on_duplicate_constraints_with_extras(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.5"
+    solver.provider.set_package_python_versions("~2.7 || ^3.5")
     package.add_dependency("requests", {"version": "^2.22.0", "extras": ["security"]})
 
     requests = get_package("requests", "2.22.0")
@@ -1825,7 +1835,7 @@ def test_ignore_python_constraint_no_overlap_dependencies(solver, repo, package)
 def test_solver_should_not_go_into_an_infinite_loop_on_duplicate_dependencies(
     solver, repo, package
 ):
-    package.python_versions = "~2.7 || ^3.5"
+    solver.provider.set_package_python_versions("~2.7 || ^3.5")
     package.add_dependency("A", "^1.0")
 
     package_a = get_package("A", "1.0.0")
@@ -2000,8 +2010,28 @@ def test_solver_should_not_update_same_version_packages_if_installed_has_no_sour
 
     ops = solver.solve()
 
+    check_solver_result(ops, [{"job": "install", "package": foo, "skipped": True}])
+
+
+def test_solver_should_use_the_python_constraint_from_the_environment_if_available(
+    solver, repo, package, installed
+):
+    solver.provider.set_package_python_versions("~2.7 || ^3.5")
+    package.add_dependency("A", "^1.0")
+
+    a = get_package("A", "1.0.0")
+    a.add_dependency("B", {"version": "^1.0.0", "markers": 'python_version < "3.2"'})
+    b = get_package("B", "1.0.0")
+    b.python_versions = ">=2.6, <3"
+
+    repo.add_package(a)
+    repo.add_package(b)
+
+    with solver.use_environment(MockEnv((2, 7, 18))):
+        ops = solver.solve()
+
     check_solver_result(
-        ops, [{"job": "install", "package": foo, "skipped": True}],
+        ops, [{"job": "install", "package": b}, {"job": "install", "package": a}],
     )