Fixed issue #4917 and Upgraded vendored distro to v1.2.0

Fixed UnicodeDecodeError on Linux which system encoding is not UTF-8.

news/4932.bugfix

@@ -0,0 +1 @@
+Fixed UnicodeDecodeError on Linux which system encoding is not UTF-8.

news/distro.vendor

@@ -1 +1 @@
-Upgraded distro to 1.0.4.
+Upgraded distro to 1.2.0.

src/pip/_vendor/distro.py

@@ -38,9 +38,6 @@
 import subprocess
 
 
-if not sys.platform.startswith('linux'):
-    raise ImportError('Unsupported platform: {0}'.format(sys.platform))
-
 _UNIXCONFDIR = os.environ.get('UNIXCONFDIR', '/etc')
 _OS_RELEASE_BASENAME = 'os-release'
 
@@ -511,6 +508,21 @@ def distro_release_attr(attribute):
     return _distro.distro_release_attr(attribute)
 
 
+class cached_property(object):
+    """A version of @property which caches the value.  On access, it calls the
+    underlying function and sets the value in `__dict__` so future accesses
+    will not re-call the property.
+    """
+    def __init__(self, f):
+        self._fname = f.__name__
+        self._f = f
+
+    def __get__(self, obj, owner):
+        assert obj is not None, 'call {} on an instance'.format(self._fname)
+        ret = obj.__dict__[self._fname] = self._f(obj)
+        return ret
+
+
 class LinuxDistribution(object):
     """
     Provides information about a Linux distribution.
@@ -576,6 +588,9 @@ def __init__(self,
           `distro release file`_ that is actually used as a data source. The
           empty string if no distro release file is used as a data source.
 
+        * ``include_lsb`` (bool): The result of the ``include_lsb`` parameter.
+          This controls whether the lsb information will be loaded.
+
         Raises:
 
         * :py:exc:`IOError`: Some I/O issue with an os-release file or distro
@@ -591,26 +606,20 @@ def __init__(self,
         self.os_release_file = os_release_file or \
             os.path.join(_UNIXCONFDIR, _OS_RELEASE_BASENAME)
         self.distro_release_file = distro_release_file or ''  # updated later
-        self._os_release_info = self._get_os_release_info()
-        self._lsb_release_info = self._get_lsb_release_info() \
-            if include_lsb else {}
-        self._distro_release_info = self._get_distro_release_info()
+        self.include_lsb = include_lsb
 
     def __repr__(self):
         """Return repr of all info
         """
         return \
             "LinuxDistribution(" \
-            "os_release_file={0!r}, " \
-            "distro_release_file={1!r}, " \
-            "_os_release_info={2!r}, " \
-            "_lsb_release_info={3!r}, " \
-            "_distro_release_info={4!r})".format(
-                self.os_release_file,
-                self.distro_release_file,
-                self._os_release_info,
-                self._lsb_release_info,
-                self._distro_release_info)
+            "os_release_file={self.os_release_file!r}, " \
+            "distro_release_file={self.distro_release_file!r}, " \
+            "include_lsb={self.include_lsb!r}, " \
+            "_os_release_info={self._os_release_info!r}, " \
+            "_lsb_release_info={self._lsb_release_info!r}, " \
+            "_distro_release_info={self._distro_release_info!r})".format(
+                self=self)
 
     def linux_distribution(self, full_distribution_name=True):
         """
@@ -835,7 +844,8 @@ def distro_release_attr(self, attribute):
         """
         return self._distro_release_info.get(attribute, '')
 
-    def _get_os_release_info(self):
+    @cached_property
+    def _os_release_info(self):
         """
         Get the information items from the specified os-release file.
 
@@ -907,34 +917,24 @@ def _parse_os_release_content(lines):
                 pass
         return props
 
-    def _get_lsb_release_info(self):
+    @cached_property
+    def _lsb_release_info(self):
         """
         Get the information items from the lsb_release command output.
 
         Returns:
             A dictionary containing all information items.
         """
-        cmd = 'lsb_release -a'
-        process = subprocess.Popen(
-            cmd,
-            shell=True,
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE)
-        stdout, stderr = process.communicate()
-        stdout, stderr = stdout.decode('utf-8'), stderr.decode('utf-8')
-        code = process.returncode
-        if code == 0:
-            content = stdout.splitlines()
-            return self._parse_lsb_release_content(content)
-        elif code == 127:  # Command not found
+        if not self.include_lsb:
             return {}
-        else:
-            if sys.version_info[:2] >= (3, 5):
-                raise subprocess.CalledProcessError(code, cmd, stdout, stderr)
-            elif sys.version_info[:2] >= (2, 7):
-                raise subprocess.CalledProcessError(code, cmd, stdout)
-            elif sys.version_info[:2] == (2, 6):
-                raise subprocess.CalledProcessError(code, cmd)
+        with open(os.devnull, 'w') as devnull:
+            try:
+                cmd = ('lsb_release', '-a')
+                stdout = subprocess.check_output(cmd, stderr=devnull)
+            except OSError:  # Command not found
+                return {}
+        content = stdout.decode(sys.getfilesystemencoding()).splitlines()
+        return self._parse_lsb_release_content(content)
 
     @staticmethod
     def _parse_lsb_release_content(lines):
@@ -952,7 +952,6 @@ def _parse_lsb_release_content(lines):
         """
         props = {}
         for line in lines:
-            line = line.decode('utf-8') if isinstance(line, bytes) else line
             kv = line.strip('\n').split(':', 1)
             if len(kv) != 2:
                 # Ignore lines without colon.
@@ -961,7 +960,8 @@ def _parse_lsb_release_content(lines):
             props.update({k.replace(' ', '_').lower(): v.strip()})
         return props
 
-    def _get_distro_release_info(self):
+    @cached_property
+    def _distro_release_info(self):
         """
         Get the information items from the specified distro release file.
 
@@ -1001,6 +1001,9 @@ def _get_distro_release_info(self):
                              'fedora-release',
                              'gentoo-release',
                              'mageia-release',
+                             'mandrake-release',
+                             'mandriva-release',
+                             'mandrivalinux-release',
                              'manjaro-release',
                              'oracle-release',
                              'redhat-release',

src/pip/_vendor/vendor.txt

@@ -1,6 +1,6 @@
 appdirs==1.4.3
 distlib==0.2.6
-distro==1.0.4
+distro==1.2.0
 html5lib==1.0b10
 six==1.11.0
 colorama==0.3.9