Fixed multiple constraint handling for the root package

CHANGELOG.md

@@ -9,6 +9,7 @@
 - Fixed an error when resolving directory dependencies with no sub dependencies.
 - Fixed an error when locking packages with no description.
 - Fixed path resolution for transitive file dependencies.
+- Fixed multiple constraints handling for the root package.
 
 
 ## [0.12.10] - 2018-11-22

poetry/mixology/version_solver.py

@@ -374,7 +374,6 @@ class VersionSolver:
 
             return dependency.name
 
-        if not version.is_root():
         version = self._provider.complete_package(version)
 
         conflict = False

poetry/packages/dependency_package.py

@@ -11,6 +11,9 @@ class DependencyPackage(object):
     def package(self):
         return self._package
 
+    def clone(self):  # type: () -> DependencyPackage
+        return self.__class__(self._dependency, self._package.clone())
+
     def __getattr__(self, name):
         return getattr(self._package, name)
 

poetry/packages/package.py

@@ -369,6 +369,9 @@ class Package(object):
         for dep in self.requires:
             clone.requires.append(dep)
 
+        for dep in self.dev_requires:
+            clone.dev_requires.append(dep)
+
         return clone
 
     def __hash__(self):

poetry/packages/project_package.py

@@ -43,3 +43,13 @@ class ProjectPackage(Package):
         self._python_marker = parse_marker(
             create_nested_marker("python_version", self._python_constraint)
         )
+
+    def clone(self):  # type: () -> ProjectPackage
+        package = super(ProjectPackage, self).clone()
+
+        package.build = self.build
+        package.packages = self.packages[:]
+        package.include = self.include[:]
+        package.exclude = self.exclude[:]
+
+        return package

poetry/puzzle/provider.py

@@ -453,9 +453,13 @@ class Provider:
         self, package
     ):  # type: (DependencyPackage) -> DependencyPackage
         if package.is_root():
-            return package
+            package = package.clone()
 
-        if package.source_type not in {"directory", "file", "git"}:
+        if not package.is_root() and package.source_type not in {
+            "directory",
+            "file",
+            "git",
+        }:
             package = DependencyPackage(
                 package.dependency,
                 self._pool.package(
@@ -487,7 +491,6 @@ class Provider:
         # An example of this is:
         #   - pypiwin32 (220); sys_platform == "win32" and python_version >= "3.6"
         #   - pypiwin32 (219); sys_platform == "win32" and python_version < "3.6"
-        if not package.is_root():
         duplicates = {}
         for dep in dependencies:
             if dep.name not in duplicates:
@@ -501,9 +504,7 @@ class Provider:
                 dependencies.append(deps[0])
                 continue
 
-                self.debug(
-                    "<debug>Duplicate dependencies for {}</debug>".format(dep_name)
-                )
+            self.debug("<debug>Duplicate dependencies for {}</debug>".format(dep_name))
 
             # Regrouping by constraint
             by_constraint = {}
@@ -550,9 +551,7 @@ class Provider:
 
             if len(by_constraint) == 1:
                 self.debug(
-                        "<debug>Merging requirements for {}</debug>".format(
-                            str(deps[0])
-                        )
+                    "<debug>Merging requirements for {}</debug>".format(str(deps[0]))
                 )
                 dependencies.append(list(by_constraint.values())[0][0])
                 continue

tests/puzzle/test_solver.py

@@ -1552,3 +1552,21 @@ def test_solver_skips_invalid_versions(package, installed, locked, io):
     check_solver_result(
         ops, [{"job": "install", "package": get_package("trackpy", "0.4.1")}]
     )
+
+
+def test_multiple_constraints_on_root(package, solver, repo):
+    package.add_dependency("foo", {"version": "^1.0", "python": "^2.7"})
+    package.add_dependency("foo", {"version": "^2.0", "python": "^3.7"})
+
+    foo15 = get_package("foo", "1.5.0")
+    foo25 = get_package("foo", "2.5.0")
+
+    repo.add_package(foo15)
+    repo.add_package(foo25)
+
+    ops = solver.solve()
+
+    check_solver_result(
+        ops,
+        [{"job": "install", "package": foo15}, {"job": "install", "package": foo25}],
+    )