Add pip>=20.0 support

.appveyor.yml

@@ -21,6 +21,8 @@ environment:
           PIP: 19.2.3
         - TOXENV: py27-pip19.3
           PIP: 19.3
+        - TOXENV: py27-pip20.0
+          PIP: 20.0
         - TOXENV: py27-pipmaster
           PIP: master
         - TOXENV: py27-piplatest-coverage
@@ -44,6 +46,8 @@ environment:
           PIP: 19.2.3
         - TOXENV: py35-pip19.3
           PIP: 19.3
+        - TOXENV: py35-pip20.0
+          PIP: 20.0
         - TOXENV: py35-pipmaster
           PIP: master
         - TOXENV: py35-piplatest
@@ -67,6 +71,8 @@ environment:
           PIP: 19.2.3
         - TOXENV: py36-pip19.3
           PIP: 19.3
+        - TOXENV: py36-pip20.0
+          PIP: 20.0
         - TOXENV: py36-pipmaster
           PIP: master
         - TOXENV: py36-piplatest
@@ -90,6 +96,8 @@ environment:
           PIP: 19.2.3
         - TOXENV: py37-pip19.3
           PIP: 19.3
+        - TOXENV: py37-pip20.0
+          PIP: 20.0
         - TOXENV: py37-pipmaster-coverage
           PIP: master
         - TOXENV: py37-piplatest-coverage
@@ -111,6 +119,8 @@ environment:
           PIP: 19.2.3
         - TOXENV: py38-pip19.3-coverage
           PIP: 19.3
+        - TOXENV: py38-pip20.0
+          PIP: 20.0
         - TOXENV: py38-pipmaster-coverage
           PIP: master
         - TOXENV: py38-piplatest-coverage

.travis.yml

@@ -19,6 +19,7 @@ env:
   - PIP=19.1
   - PIP=19.2.3
   - PIP=19.3
+  - PIP=20.0
   - PIP=latest
   - PIP=master
 

piptools/_compat/__init__.py

@@ -16,12 +16,13 @@
     PackageFinder,
     PyPI,
     RequirementSet,
-    RequirementTracker,
     Resolver,
     Wheel,
     WheelCache,
     cmdoptions,
     get_installed_distributions,
+    get_requirement_tracker,
+    global_tempdir_manager,
     install_req_from_editable,
     install_req_from_line,
     is_dir_url,

piptools/_compat/pip_compat.py

@@ -18,6 +18,16 @@ def RequirementTracker():
         yield
 
 
+# Introduced in pip 20.0
+try:
+    from pip._internal.utils.temp_dir import global_tempdir_manager
+except ImportError:
+
+    @contextmanager
+    def global_tempdir_manager():
+        yield
+
+
 def do_import(module_path, subimport=None, old_path=None):
     old_path = old_path or module_path
     prefixes = ["pip._internal", "pip"]
@@ -50,7 +60,7 @@ def do_import(module_path, subimport=None, old_path=None):
 PackageFinder = do_import("index.package_finder", "PackageFinder", old_path="index")
 FormatControl = do_import("models.format_control", "FormatControl", old_path="index")
 InstallCommand = do_import("commands.install", "InstallCommand")
-Wheel = do_import("wheel", "Wheel")
+Wheel = do_import("models.wheel", "Wheel", old_path="wheel")
 cmdoptions = do_import("cli.cmdoptions", old_path="cmdoptions")
 get_installed_distributions = do_import(
     "utils.misc", "get_installed_distributions", old_path="utils"
@@ -96,3 +106,12 @@ def is_dir_url(link):
         return _is_dir_url(link)
 
     return link.is_existing_dir()
+
+
+def get_requirement_tracker():
+    if PIP_VERSION[:2] <= (19, 3):
+        return RequirementTracker()
+
+    from pip._internal.req import req_tracker
+
+    return req_tracker.get_requirement_tracker()

piptools/repositories/pypi.py

@@ -14,12 +14,13 @@
     Link,
     PyPI,
     RequirementSet,
-    RequirementTracker,
     Resolver as PipResolver,
     TemporaryDirectory,
     Wheel,
     WheelCache,
     contextlib,
+    get_requirement_tracker,
+    global_tempdir_manager,
     is_dir_url,
     is_file_url,
     is_vcs_url,
@@ -60,11 +61,11 @@ def __init__(self, pip_args, build_isolation=False):
         # Use pip's parser for pip.conf management and defaults.
         # General options (find_links, index_url, extra_index_url, trusted_host,
         # and pre) are deferred to pip.
-        command = create_install_command()
-        self.options, _ = command.parse_args(pip_args)
+        self.command = create_install_command()
+        self.options, _ = self.command.parse_args(pip_args)
 
-        self.session = command._build_session(self.options)
-        self.finder = command._build_package_finder(
+        self.session = self.command._build_session(self.options)
+        self.finder = self.command._build_package_finder(
             options=self.options, session=self.session
         )
 
@@ -148,9 +149,14 @@ def find_best_match(self, ireq, prereleases=None):
             )
             best_candidate = best_candidate_result.best_candidate
 
+        if PIP_VERSION[:2] <= (19, 3):
+            best_candidate_name = best_candidate.project
+        else:
+            best_candidate_name = best_candidate.name
+
         # Turn the candidate into a pinned InstallRequirement
         return make_install_requirement(
-            best_candidate.project,
+            best_candidate_name,
             best_candidate.version,
             ireq.extras,
             constraint=ireq.constraint,
@@ -203,28 +209,44 @@ def resolve_reqs(self, download_dir, ireq, wheel_cache):
                 resolver_kwargs["make_install_req"] = make_install_req
 
             if PIP_VERSION >= (20,):
-                preparer_kwargs["session"] = self.session
                 del resolver_kwargs["session"]
+                del preparer_kwargs["progress_bar"]
 
             resolver = None
             preparer = None
-            with RequirementTracker() as req_tracker:
+
+            if PIP_VERSION[:2] <= (19, 3):
+                tmp_dir_cm = contextlib.nullcontext()
+            else:
+                from pip._internal.utils.temp_dir import TempDirectory
+
+                tmp_dir_cm = TempDirectory(kind="req-tracker")
+
+            with get_requirement_tracker() as req_tracker, tmp_dir_cm as temp_build_dir:
                 # Pip 18 uses a requirement tracker to prevent fork bombs
                 if req_tracker:
                     preparer_kwargs["req_tracker"] = req_tracker
-                preparer = RequirementPreparer(**preparer_kwargs)
+
+                if PIP_VERSION[:2] <= (19, 3):
+                    preparer = RequirementPreparer(**preparer_kwargs)
+                else:
+                    preparer = self.command.make_requirement_preparer(
+                        temp_build_dir=temp_build_dir,
+                        options=self.options,
+                        req_tracker=req_tracker,
+                        session=self.session,
+                        finder=self.finder,
+                        use_user_site=self.options.use_user_site,
+                    )
+
                 resolver_kwargs["preparer"] = preparer
                 reqset = RequirementSet()
                 ireq.is_direct = True
                 reqset.add_requirement(ireq)
 
                 resolver = PipResolver(**resolver_kwargs)
-                require_hashes = False
-                if PIP_VERSION < (20,):
-                    resolver.require_hashes = require_hashes
-                    results = resolver._resolve_one(reqset, ireq)
-                else:
-                    results = resolver._resolve_one(reqset, ireq, require_hashes)
+                resolver.require_hashes = False
+                results = resolver._resolve_one(reqset, ireq)
 
                 reqset.cleanup_files()
 
@@ -265,9 +287,10 @@ def get_dependencies(self, ireq):
             wheel_cache = WheelCache(CACHE_DIR, self.options.format_control)
             prev_tracker = os.environ.get("PIP_REQ_TRACKER")
             try:
-                self._dependencies_cache[ireq] = self.resolve_reqs(
-                    download_dir, ireq, wheel_cache
-                )
+                with global_tempdir_manager():
+                    self._dependencies_cache[ireq] = self.resolve_reqs(
+                        download_dir, ireq, wheel_cache
+                    )
             finally:
                 if "PIP_REQ_TRACKER" in os.environ:
                     if prev_tracker:

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
     # NOTE: keep this in sync with the env list in .travis.yml for tox-travis.
-    py{27,35,36,37,38,py,py3}-pip{8.1.1,9.0.1,9.0.3,10.0.1,18.0,19.0.3,19.1,19.2.3,19.3,latest,master}-coverage
+    py{27,35,36,37,38,py,py3}-pip{8.1.1,9.0.1,9.0.3,10.0.1,18.0,19.0.3,19.1,19.2.3,19.3,20.0,latest,master}-coverage
     checkqa
     readme
 skip_missing_interpreters = True
@@ -18,6 +18,7 @@ deps =
     pip19.1: pip==19.1
     pip19.2.3: pip==19.2.3
     pip19.3: pip==19.3
+    pip20.0: -e git+https://github.com/pypa/pip.git@master#egg=pip
     mock
     pytest!=5.1.2
     pytest-rerunfailures
@@ -34,6 +35,7 @@ setenv =
     pip19.1: PIP==19.1
     pip19.2.3: PIP==19.2.3
     pip19.3: PIP==19.3
+    pip20.0: PIP==20.0
 
     coverage: PYTEST_ADDOPTS=--strict --doctest-modules --cov --cov-report=term-missing {env:PYTEST_ADDOPTS:}
 commands_pre =
@@ -65,5 +67,6 @@ PIP =
     19.1: pip19.1
     19.2.3: pip19.2.3
     19.3: pip19.3
+    20.0: pip20.0
     latest: piplatest
     master: pipmaster