Remove now obsolete pip version check due to vendoring

piptools/repositories/local.py

@@ -6,10 +6,7 @@
 
 from piptools.utils import as_tuple, key_from_req, make_install_requirement
 from .base import BaseRepository
-try:
-    from pip.utils.hashes import FAVORITE_HASH
-except ImportError:
-    FAVORITE_HASH = 'sha256'
+from pip.utils.hashes import FAVORITE_HASH
 
 
 def ireq_satisfied_by_existing_pin(ireq, existing_pin):

piptools/repositories/pypi.py

@@ -11,16 +11,13 @@
 from pip.index import PackageFinder
 from pip.req.req_set import RequirementSet
 from pip.wheel import Wheel
-try:
-    from pip.utils.hashes import FAVORITE_HASH
-except ImportError:
-    FAVORITE_HASH = 'sha256'
+from pip.utils.hashes import FAVORITE_HASH
 
 from .._compat import TemporaryDirectory
 from ..cache import CACHE_DIR
 from ..exceptions import NoCandidateFound
 from ..utils import (fs_str, is_pinned_requirement, lookup_table,
-                     make_install_requirement, pip_version_info)
+                     make_install_requirement)
 from .base import BaseRepository
 
 
@@ -87,11 +84,7 @@ def clear_caches(self):
 
     def find_all_candidates(self, req_name):
         if req_name not in self._available_candidates_cache:
-            # pip 8 changed the internal API, making this a public method
-            if pip_version_info >= (8, 0):
-                candidates = self.finder.find_all_candidates(req_name)
-            else:
-                candidates = self.finder._find_all_versions(req_name)
+            candidates = self.finder.find_all_candidates(req_name)
             self._available_candidates_cache[req_name] = candidates
         return self._available_candidates_cache[req_name]
 

piptools/scripts/compile.py

@@ -15,13 +15,9 @@
 from ..logging import log
 from ..repositories import LocalRequirementsRepository, PyPIRepository
 from ..resolver import Resolver
-from ..utils import (assert_compatible_pip_version, dedup, is_pinned_requirement,
-                     key_from_req, UNSAFE_PACKAGES)
+from ..utils import (dedup, is_pinned_requirement, key_from_req, UNSAFE_PACKAGES)
 from ..writer import OutputWriter
 
-# Make sure we're using a compatible version of pip
-assert_compatible_pip_version()
-
 DEFAULT_REQUIREMENTS_FILE = 'requirements.in'
 
 

piptools/scripts/sync.py

@@ -10,10 +10,7 @@
 from .. import click, sync
 from ..exceptions import PipToolsError
 from ..logging import log
-from ..utils import assert_compatible_pip_version, flat_map
-
-# Make sure we're using a compatible version of pip
-assert_compatible_pip_version()
+from ..utils import flat_map
 
 DEFAULT_REQUIREMENTS_FILE = 'requirements.txt'
 

piptools/utils.py

@@ -6,34 +6,16 @@
 from itertools import chain, groupby
 from collections import OrderedDict
 
-import pip
 from pip.req import InstallRequirement
 
 from first import first
 
 from .click import style
 
 
-def safeint(s):
-    try:
-        return int(s)
-    except ValueError:
-        return 0
-
-
-pip_version_info = tuple(safeint(digit) for digit in pip.__version__.split('.'))
-
 UNSAFE_PACKAGES = {'setuptools', 'distribute', 'pip'}
 
 
-def assert_compatible_pip_version():
-    # Make sure we're using a reasonably modern version of pip
-    if not pip_version_info >= (8, 0):
-        print('pip-compile requires at least version 8.0 of pip ({} found), '
-              'perhaps run `pip install --upgrade pip`?'.format(pip.__version__))
-        sys.exit(4)
-
-
 def key_from_ireq(ireq):
     """Get a standardized key for an InstallRequirement."""
     if ireq.req is None and ireq.link is not None:
@@ -45,10 +27,10 @@ def key_from_ireq(ireq):
 def key_from_req(req):
     """Get an all-lowercase version of the requirement's name."""
     if hasattr(req, 'key'):
-        # pip 8.1.1 or below, using pkg_resources
+        # from pkg_resources, such as installed dists for pip-sync
         key = req.key
     else:
-        # pip 8.1.2 or above, using packaging
+        # from packaging, such as install requirements from requirements.txt
         key = req.name
 
     key = key.replace('_', '-').lower()
@@ -221,10 +203,10 @@ def dedup(iterable):
 def name_from_req(req):
     """Get the name of the requirement"""
     if hasattr(req, 'project_name'):
-        # pip 8.1.1 or below, using pkg_resources
+        # from pkg_resources, such as installed dists for pip-sync
         return req.project_name
     else:
-        # pip 8.1.2 or above, using packaging
+        # from packaging, such as install requirements from requirements.txt
         return req.name