Fix the —no-dev option in install not working properly

CHANGELOG.md

 # Change Log
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed the `--no-dev` option in `install` not working properly.
+
+
 ## [0.12.2] - 2018-10-17
 
 ### Fixed

poetry/installation/installer.py

@@ -182,7 +182,12 @@ class Installer:
 
         self._populate_local_repo(local_repo, ops, locked_repository)
 
-        with self._package.with_python_versions(
+        root = self._package
+        if not self.is_dev_mode():
+            root = root.clone()
+            del root.dev_requires[:]
+
+        with root.with_python_versions(
             ".".join([str(i) for i in self._env.version_info[:3]])
         ):
             # We resolve again by only using the lock file
@@ -205,11 +210,7 @@ class Installer:
                 whitelist.append(pkg.name)
 
             solver = Solver(
-                self._package,
-                pool,
-                self._installed_repository,
-                locked_repository,
-                NullIO(),
+                root, pool, self._installed_repository, locked_repository, NullIO()
             )
 
             ops = solver.solve(use_latest=whitelist)
@@ -482,7 +483,7 @@ class Installer:
                     op.skip("Not required")
 
             # If the package is a dev package and dev packages
-            # are not requests, we skip it
+            # are not requested, we skip it
             if package.category == "dev" and not self.is_dev_mode():
                 op.skip("Dev dependencies not requested")
 

poetry/packages/package.py

@@ -363,7 +363,7 @@ class Package(object):
         self.python_versions = original_python_versions
 
     def clone(self):  # type: () -> Package
-        clone = Package(self.pretty_name, self.version)
+        clone = self.__class__(self.pretty_name, self.version)
         clone.category = self.category
         clone.optional = self.optional
         clone.python_versions = self.python_versions

tests/installation/fixtures/install-no-dev.test

+[[package]]
+name = "A"
+version = "1.0"
+description = ""
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "B"
+version = "1.1"
+description = ""
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "C"
+version = "1.2"
+description = ""
+category = "dev"
+optional = false
+python-versions = "*"
+
+[metadata]
+python-versions = "*"
+content-hash = "123456789"
+
+[metadata.hashes]
+"A" = []
+"B" = []
+"C" = []

tests/installation/test_installer.py

@@ -228,6 +228,75 @@ def test_run_update_after_removing_dependencies(
     assert len(removals) == 1
 
 
+def test_run_install_no_dev(installer, locker, repo, package, installed):
+    locker.locked(True)
+    locker.mock_lock_data(
+        {
+            "package": [
+                {
+                    "name": "A",
+                    "version": "1.0",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                },
+                {
+                    "name": "B",
+                    "version": "1.1",
+                    "category": "main",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                },
+                {
+                    "name": "C",
+                    "version": "1.2",
+                    "category": "dev",
+                    "optional": False,
+                    "platform": "*",
+                    "python-versions": "*",
+                    "checksum": [],
+                },
+            ],
+            "metadata": {
+                "python-versions": "*",
+                "platform": "*",
+                "content-hash": "123456789",
+                "hashes": {"A": [], "B": [], "C": []},
+            },
+        }
+    )
+    package_a = get_package("A", "1.0")
+    package_b = get_package("B", "1.1")
+    package_c = get_package("C", "1.2")
+    repo.add_package(package_a)
+    repo.add_package(package_b)
+    repo.add_package(package_c)
+
+    installed.add_package(package_a)
+    installed.add_package(package_b)
+    installed.add_package(package_c)
+
+    package.add_dependency("A", "~1.0")
+    package.add_dependency("B", "~1.1")
+    package.add_dependency("C", "~1.2", category="dev")
+
+    installer.dev_mode(False)
+    installer.run()
+
+    installs = installer.installer.installs
+    assert len(installs) == 0
+
+    updates = installer.installer.updates
+    assert len(updates) == 0
+
+    removals = installer.installer.removals
+    assert len(removals) == 1
+
+
 def test_run_whitelist_add(installer, locker, repo, package):
     locker.locked(True)
     locker.mock_lock_data(