Preliminary manylinux2 support.

news/5008.feature

@@ -0,0 +1,3 @@
+Implement manylinux2 platform tag support.  manylinux2 is the successor
+to manylinux1.  It allows carefully compiled binary wheels to be installed
+on compatible Linux platforms.

src/pip/_internal/pep425tags.py

@@ -157,6 +157,23 @@ def is_manylinux1_compatible():
     return pip._internal.utils.glibc.have_compatible_glibc(2, 5)
 
 
+def is_manylinux2_compatible():
+    # Only Linux, and only x86-64 / i686
+    if get_platform() not in {"linux_x86_64", "linux_i686"}:
+        return False
+
+    # Check for presence of _manylinux module
+    try:
+        import _manylinux
+        return bool(_manylinux.manylinux2_compatible)
+    except (ImportError, AttributeError):
+        # Fall through to heuristic check below
+        pass
+
+    # Check glibc version. CentOS 6 uses glibc 2.12.
+    return pip._internal.utils.glibc.have_compatible_glibc(2, 12)
+
+
 def get_darwin_arches(major, minor, machine):
     """Return a list of supported arches (including group arches) for
     the given major, minor and machine architecture of an macOS machine.
@@ -276,8 +293,16 @@ def get_supported(versions=None, noarch=False, platform=None,
             else:
                 # arch pattern didn't match (?!)
                 arches = [arch]
-        elif platform is None and is_manylinux1_compatible():
-            arches = [arch.replace('linux', 'manylinux1'), arch]
+        elif arch.startswith('manylinux2'):
+            # manylinux1 wheels run on manylinux2 systems.
+            arches = [arch, arch.replace('manylinux2', 'manylinux1')]
+        elif platform is None:
+            arches = []
+            if is_manylinux2_compatible():
+                arches.append(arch.replace('linux', 'manylinux2'))
+            if is_manylinux1_compatible():
+                arches.append(arch.replace('linux', 'manylinux1'))
+            arches.append(arch)
         else:
             arches = [arch]
 

tests/functional/test_download.py

@@ -322,54 +322,71 @@ def test_download_specify_platform(script, data):
     )
 
 
-def test_download_platform_manylinux(script, data):
-    """
-    Test using "pip download --platform" to download a .whl archive
-    supported for a specific platform.
-    """
-    fake_wheel(data, 'fake-1.0-py2.py3-none-any.whl')
-    # Confirm that universal wheels are returned even for specific
-    # platforms.
-    result = script.pip(
-        'download', '--no-index', '--find-links', data.find_links,
-        '--only-binary=:all:',
-        '--dest', '.',
-        '--platform', 'linux_x86_64',
-        'fake',
-    )
-    assert (
-        Path('scratch') / 'fake-1.0-py2.py3-none-any.whl'
-        in result.files_created
-    )
-
-    data.reset()
-    fake_wheel(data, 'fake-1.0-py2.py3-none-manylinux1_x86_64.whl')
-    result = script.pip(
-        'download', '--no-index', '--find-links', data.find_links,
-        '--only-binary=:all:',
-        '--dest', '.',
-        '--platform', 'manylinux1_x86_64',
-        'fake',
-    )
-    assert (
-        Path('scratch') /
-        'fake-1.0-py2.py3-none-manylinux1_x86_64.whl'
-        in result.files_created
-    )
-
-    # When specifying the platform, manylinux1 needs to be the
-    # explicit platform--it won't ever be added to the compatible
-    # tags.
-    data.reset()
-    fake_wheel(data, 'fake-1.0-py2.py3-none-linux_x86_64.whl')
-    result = script.pip(
-        'download', '--no-index', '--find-links', data.find_links,
-        '--only-binary=:all:',
-        '--dest', '.',
-        '--platform', 'linux_x86_64',
-        'fake',
-        expect_error=True,
-    )
+class TestDownloadPlatformManylinuxes(object):
+    """
+    "pip download --platform" downloads a .whl archive supported for
+    manylinux platforms.
+    """
+
+    @pytest.mark.parametrize("platform", [
+        "linux_x86_64",
+        "manylinux1_x86_64",
+        "manylinux2_x86_64",
+    ])
+    def test_download_universal(self, platform, script, data):
+        """
+        Universal wheels are returned even for specific platforms.
+        """
+        fake_wheel(data, 'fake-1.0-py2.py3-none-any.whl')
+        result = script.pip(
+            'download', '--no-index', '--find-links', data.find_links,
+            '--only-binary=:all:',
+            '--dest', '.',
+            '--platform', platform,
+            'fake',
+        )
+        assert (
+            Path('scratch') / 'fake-1.0-py2.py3-none-any.whl'
+            in result.files_created
+        )
+
+    @pytest.mark.parametrize("wheel_abi,platform", [
+        ("manylinux1_x86_64", "manylinux1_x86_64"),
+        ("manylinux1_x86_64", "manylinux2_x86_64"),
+        ("manylinux2_x86_64", "manylinux2_x86_64"),
+    ])
+    def test_download_compatible_manylinuxes(
+            self, wheel_abi, platform, script, data,
+    ):
+        """
+        Earlier manylinuxes are compatible with later manylinuxes.
+        """
+        wheel = 'fake-1.0-py2.py3-none-{}.whl'.format(wheel_abi)
+        fake_wheel(data, wheel)
+        result = script.pip(
+            'download', '--no-index', '--find-links', data.find_links,
+            '--only-binary=:all:',
+            '--dest', '.',
+            '--platform', platform,
+            'fake',
+        )
+        assert Path('scratch') / wheel in result.files_created
+
+    def test_explicit_platform_only(self, data, script):
+        """
+        When specifying the platform, manylinux1 needs to be the
+        explicit platform--it won't ever be added to the compatible
+        tags.
+        """
+        fake_wheel(data, 'fake-1.0-py2.py3-none-linux_x86_64.whl')
+        script.pip(
+            'download', '--no-index', '--find-links', data.find_links,
+            '--only-binary=:all:',
+            '--dest', '.',
+            '--platform', 'linux_x86_64',
+            'fake',
+            expect_error=True,
+        )
 
 
 def test_download_specify_python_version(script, data):

tests/unit/test_pep425tags.py

@@ -1,5 +1,7 @@
 import sys
 
+import pytest
+
 from mock import patch
 
 from pip._internal import pep425tags
@@ -114,44 +116,57 @@ def test_manual_abi_dm_flags(self):
         self.abi_tag_unicode('dm', {'Py_DEBUG': True, 'WITH_PYMALLOC': True})
 
 
-class TestManylinux1Tags(object):
-
+@pytest.mark.parametrize('is_manylinux_compatible', [
+    pep425tags.is_manylinux1_compatible,
+    pep425tags.is_manylinux2_compatible,
+])
+class TestManylinuxTags(object):
+    """
+    Tests common to all manylinux tags (e.g. manylinux1, manylinux2,
+    ...)
+    """
     @patch('pip._internal.pep425tags.get_platform', lambda: 'linux_x86_64')
     @patch('pip._internal.utils.glibc.have_compatible_glibc',
            lambda major, minor: True)
-    def test_manylinux1_compatible_on_linux_x86_64(self):
+    def test_manylinux_compatible_on_linux_x86_64(self,
+                                                  is_manylinux_compatible):
         """
-        Test that manylinux1 is enabled on linux_x86_64
+        Test that manylinuxes are enabled on linux_x86_64
         """
-        assert pep425tags.is_manylinux1_compatible()
+        assert is_manylinux_compatible()
 
     @patch('pip._internal.pep425tags.get_platform', lambda: 'linux_i686')
     @patch('pip._internal.utils.glibc.have_compatible_glibc',
            lambda major, minor: True)
-    def test_manylinux1_compatible_on_linux_i686(self):
+    def test_manylinux1_compatible_on_linux_i686(self,
+                                                 is_manylinux_compatible):
         """
         Test that manylinux1 is enabled on linux_i686
         """
-        assert pep425tags.is_manylinux1_compatible()
+        assert is_manylinux_compatible()
 
     @patch('pip._internal.pep425tags.get_platform', lambda: 'linux_x86_64')
     @patch('pip._internal.utils.glibc.have_compatible_glibc',
            lambda major, minor: False)
-    def test_manylinux1_2(self):
+    def test_manylinux1_2(self, is_manylinux_compatible):
         """
         Test that manylinux1 is disabled with incompatible glibc
         """
-        assert not pep425tags.is_manylinux1_compatible()
+        assert not is_manylinux_compatible()
 
     @patch('pip._internal.pep425tags.get_platform', lambda: 'arm6vl')
     @patch('pip._internal.utils.glibc.have_compatible_glibc',
            lambda major, minor: True)
-    def test_manylinux1_3(self):
+    def test_manylinux1_3(self, is_manylinux_compatible):
         """
         Test that manylinux1 is disabled on arm6vl
         """
-        assert not pep425tags.is_manylinux1_compatible()
+        assert not is_manylinux_compatible()
 
+
+class TestManylinux1Tags(object):
+
+    @patch('pip._internal.pep425tags.is_manylinux2_compatible', lambda: False)
     @patch('pip._internal.pep425tags.get_platform', lambda: 'linux_x86_64')
     @patch('pip._internal.utils.glibc.have_compatible_glibc',
            lambda major, minor: True)
@@ -172,3 +187,49 @@ def test_manylinux1_tag_is_first(self):
                 assert arches == ['manylinux1_x86_64', 'linux_x86_64', 'any']
             else:
                 assert arches == ['manylinux1_x86_64', 'linux_x86_64']
+
+
+class TestManylinux2Tags(object):
+
+    @patch('pip._internal.pep425tags.get_platform', lambda: 'linux_x86_64')
+    @patch('pip._internal.utils.glibc.have_compatible_glibc',
+           lambda major, minor: True)
+    @patch('sys.platform', 'linux2')
+    def test_manylinux2_tag_is_first(self):
+        """
+        Test that the more specific tag manylinux2 comes first.
+        """
+        groups = {}
+        for pyimpl, abi, arch in pep425tags.get_supported():
+            groups.setdefault((pyimpl, abi), []).append(arch)
+
+        for arches in groups.values():
+            if arches == ['any']:
+                continue
+            # Expect the most specific arch first:
+            if len(arches) == 4:
+                assert arches == ['manylinux2_x86_64',
+                                  'manylinux1_x86_64',
+                                  'linux_x86_64',
+                                  'any']
+            else:
+                assert arches == ['manylinux2_x86_64',
+                                  'manylinux1_x86_64',
+                                  'linux_x86_64']
+
+    @pytest.mark.parametrize("manylinux2,manylinux1", [
+        ("manylinux2_x86_64", "manylinux1_x86_64"),
+        ("manylinux2_i686", "manylinux1_i686"),
+    ])
+    def test_manylinux2_implies_manylinux1(self, manylinux2, manylinux1):
+        """
+        Specifying manylinux2 implies manylinux1.
+        """
+        groups = {}
+        for pyimpl, abi, arch in pep425tags.get_supported(platform=manylinux2):
+            groups.setdefault((pyimpl, abi), []).append(arch)
+
+        for arches in groups.values():
+            if arches == ['any']:
+                continue
+            assert arches[:2] == [manylinux2, manylinux1]

tests/unit/test_utils.py

@@ -539,7 +539,7 @@ def test_create_and_cleanup_work(self):
 
 
 class TestGlibc(object):
-    def test_manylinux1_check_glibc_version(self):
+    def test_manylinux_check_glibc_version(self):
         """
         Test that the check_glibc_version function is robust against weird
         glibc version strings.